JP2003259441A - Rate matching method in cdma (code division multiple access) and cdma terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rate matching method in a CDMA capable of improving the transmission quality of a specified channel such as a control channel. <P>SOLUTION: The method comprises a step (a) of acquiring line quality information indicating quality of a line used in the CDMA, a step (b) of setting rate matching attribute values based on the quality information, and a step (c) of performing a rate matching to each data of a plurality of transport channels including a specific transport channel by using the attribute values. If the quality of the line is low, the step (b) sets the attribute values so as to improve the transmission quality of the specific transport channel in the rate matching performed in the step (c). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

The present invention relates to a rate matching method in CDMA and a CDMA terminal.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 2001-160988 discloses
Techniques for rate matching between at least two transport channels included in a composite channel are described. In so-called third generation CDMA wireless communication systems, efficient multiplexing is performed with air interface services that do not have the same requirements regarding quality of service (Qos). Such a difference in quality of service means, among other things, using respective transport channels with different channel coding and interleaving, and furthermore, a different bit error rate (BER) for each transport channel. I need.

To limit the interference generated by each service, it is necessary to balance the Eb / I ratio between different services. That balancing is
This is done during transmission by rate matching of the coded transport channels transporting different services.

Rate matching is based on symbol repetition (1
Larger rate matching ratio) or symbol puncturing (rate matching ratio greater than 1).

In the OSI (Open Systems Interconnection) model of ISO (International Organization for Standardization), telecommunications equipment is
It is modeled by the layer model that constitutes the protocol stack. In that case, each layer is a protocol that provides services to higher layers.
In the Third Generation Partnership Project Committee, the services provided by the Level 1 layer to the Level 2 layer are called "Transport Channels". Therefore, a transport channel is understood as a data flow between the level 1 and level 2 layers of the same device. The Transport Channel (TrCH) allows the Level 2 layer to transfer data with a certain quality of service. This quality of service depends on the channel coding and interleaving used. Furthermore, a transport channel can be understood as a data flow between two Level 2 layers of two separate devices connected via a radio link.

For each transport channel that has its own quality of service, the higher level layers periodically provide transport blocks to the level 1 layer. The periodic time interval in which the transport block set is given to the transport channel is TTI (Transmission Time I).
Interval). Each transport channel has its own TTI. TTI is 1
It can be 0, 20, 40, or 80 msec. TTI corresponds to the connection time of the radio frame 10
It is a multiplication value of msec.

The above-mentioned Japanese Patent Laid-Open No. 2001-160988 describes the following method. A method for rate matching between at least two transport channels included in a composite channel, said method comprising at least one for each transport channel (i).
And a rate matching ratio (RFi) is applied to each transport channel (i), the rate matching ratio (RFi) comprising:
Is equal to the product of the rate matching factor (RMi) and the scale factor (LF) specified for the transport channel (i), the scale factor (LF) being the transport channel of the composite channel. , Each of the transport channels is transmitted in at least one associated transmission interval (TTI), each of the transmission time intervals (TTI) being in each of the transport channels (i). And a transmission time interval (TTI) having a different duration, at least two of said transport channels having a duration (Fi) specified in Duration of each transmission time interval (TTI) of the transport channel Defining a list of at least two transport channels arranged in descending order of the sequence list of transport channels, at least one associated transmission time interval (TTI)
Determining at least two so-called global intervals for said sequence list of transport channels for said composite channel, said at least one transport channel which has not been transported. The intervals are temporally consecutive to each other and each of the determined global intervals is associated with a first transport channel of the constellation list carrying data in a transmission time interval (TTI). Corresponding to the transmission time interval (TTI), or the smallest transmission time interval, if none of the transport channels in the array list are transporting data, the scale factor (LF).
To each of the determined global intervals, the scale factor being constant for the duration of each of the determined global intervals, and the at least two assigned scale factors being
It is characterized in that it comprises successive steps having different values in at least two global intervals.

Japanese Patent Laid-Open No. 2001-285253 describes the following method for matching at least two transport channels included in a composite channel. Each of the transport channels carries at least one data symbol (s). In accordance with the invention, each transmitted symbol (s) is amplified by a gain (Gi) specific to the transport channel (i) from which said symbol (s) originates, which results in a different on the composite channel. Balance the Eb / I ratio between different transport channels. It is applied in the field of third generation mobile telecommunications systems.

Japanese Patent Laid-Open No. 2001-57521 describes a rate matching method for the next communication system. A rate matching method for a communication system, which is a technique for matching a data bit rate in a matrix of interleaved data bits to a desired rate by a simple method. That is, a step of determining a pattern of bits to be deleted or repeated to provide a desired data rate in a matrix of uninterleaved data bits, and a method for each bit of the pattern in a manner opposite to the interleaving process. Decoding the address to generate an address for each of the bits in the matrix of interleaved data bits, and deleting or repeating each bit of the interleaved data bits according to the respective address.

[0010]

Especially in the control channel C
RC (Cyclic Redundancy Chec)
k) When a transmission error such as NG occurs, a retransmission process may occur and a control signal may be delayed.
Therefore, it is necessary to improve the transmission quality of a specific channel such as a control channel.

A rate matching method in CDMA and a CDMA terminal capable of improving the transmission quality of a specific channel such as a control channel are desired.

An object of the present invention is to provide a rate matching method in CDMA and a CDMA terminal which can improve the transmission quality of a specific channel such as a control channel.

[0013]

[Means for Solving the Problem] [Means for Solving the Problem] will be described below by using the numbers and symbols used in the [Embodiment of the Invention]. These numbers and signs are
Although added to clarify the correspondence between the description in [Claims] and the description in [Embodiment of the Invention], the technology of the invention described in [Claims] It should not be used to interpret the scope.

The CDMA (Code Divis) of the present invention
The rate matching method in Ion Multiple Access is (a) a step of obtaining line quality information indicating the quality of a line used in the CDMA communication, and (b) a rate matching attribute value based on the line quality information. And (b) rate matching the data of each of a plurality of transport channels including a specific transport channel using the rate matching attribute value. When the line quality is low,
In the rate matching performed in (c) above,
The rate matching attribute value is set so that the transmission quality of the specific transport channel is improved.

The CDMA rate matching method of the present invention further comprises the step of: (d) detecting the number of retransmissions of the data of the specific transport channel, and the step (b) includes the channel quality information and the number of retransmissions. Based on, set the rate matching attribute value,
In (b) above, when the line quality is low, and /
Alternatively, when the number of retransmissions is large, the rate matching attribute value is set so that the transmission quality of the specific transport channel is improved in the rate matching performed in (c).

In the rate matching method in CDMA of the present invention, (b) is a repetition (Repetition) in the rate matching of the specific transport channel performed in (c) when the line quality is low. The rate matching attribute value is set so as to increase the possibility that

In the rate matching method in CDMA of the present invention, (b) is a repetition of the data of the specific transport channel in the rate matching of (c) when the quality of the line is low. The rate matching attribute value of the specific transport channel and the rate matching attribute value of the transport channels other than the specific transport channel are set to different values so that the amount becomes larger.

In the rate matching method in CDMA of the present invention, the above (b) is TTI (Transm).
It is performed for each of the mission Time Intervals.

In the rate matching method in CDMA of the present invention, (b) sets the rate matching attribute value by performing closed-loop control on the information indicating the receiving channel quality of the base station as the channel quality information.

In the rate matching method in CDMA of the present invention, the specific transport channel is
It is a control channel.

In the rate matching method in CDMA of the present invention, further, (e) DPDCH (Dedicated) is based on the rate matching attribute value.
The step of changing the symbol rate of the Physical Data Channel) is provided.

The CDMA terminal of the present invention is a CDMA (Co
de Division Multiple Access
ss), which is a terminal, sets a rate matching attribute value on the basis of the line quality information detection unit (21) that obtains line quality information indicating the quality of the line used in the CDMA communication, and the line quality information. A rate matching attribute value setting unit (12) and rate matching units (13-1 to 13-13) that perform rate matching with respect to each data of a plurality of transport channels including a specific transport channel using the rate matching attribute value. -I), and the rate matching attribute value setting unit (12)
When the line quality is low, the rate matching attribute value is set so as to improve the transmission quality of the specific transport channel in the rate matching performed by the rate matching unit (13-1 to 13-I). Set.

The present invention is based on the CDMA (Code Div)
of multiple TrCHs (Transposo) in the rate matching process in the session multiple access.
RM (Rat) used in rtchannel multiplexing
In order to improve the characteristics of a specific TrCH such as a control channel, the TTI (Transmission) of each TrCH is set.
It is characterized in that it is used after being changed for each Time Interval.

The present invention is further characterized in that adaptive control is performed by performing closed-loop control based on channel quality in order to determine the RM attribute value.

On the terminal transmitting side, the specific TrCH judging section (1
In 1), it is determined whether control channels and the like are multiplexed. The RM attribute determination unit (12) determines the RM attribute value to be used by performing closed loop control on the channel quality information indicating the reception channel quality of the base station, and determines the rate of each transport channel (# 1 to #I). It is distributed to the matching units (13-1 to 13-I). The rate matching units (13-1 to 13-I) perform rate matching using the respective RM attribute values.

It is also possible to include retransmission information of the control channel in the upper layer of the TrCH such as the control channel and determine the RM attribute value of each TrCH in consideration of the information.

After that, transport channels # 1 to #
Each I is interleaved (14-1 to 14-I), each TrCH is multiplexed (Multiplex) (15), and DPDCH (Dedicated Phys) is performed.
It is configured such that it is mapped (16) to a physical channel of the I. C. Data Channel, spread, and transmitted (17).

Information about which RM attribute is used is TFCI (Transport Format).
t Combining Indicator) multiplexing unit (18) that indicates TFC (Transport Format) indicating multiplexing information of each TrCH in a certain frame.
DPC as the TFCI information
CH (Dedicated Physical Con)
control channel) and then transmitted (1
9).

At the base station receiving side, after despreading (31), D
PDCH (Dedicated Physical D)
data channel (32),
Demultiplexing (Demultipl) for each TrCH
ex) and then (33), transport channel # 1
Deinterleaved every #I (34-1 to 34-34)
I).

After that, transport channels # 1 to #
R in the rate dematching unit (35-1 to 35-I) of I
R determined by the M attribute determination unit (36)
Rate dematch using the M attribute value.

RM attribute determination section (36)
Then, the TFCI information of the DPCCH section received by the TFCI extraction section (37) is detected, and the RM attribute value used on the transmission side is determined.

Also, information on the channel quality such as the reception SIR measured in the pilot section of the received DPCCH is multiplexed on the DPCCH as channel quality information and transmitted (39, 4).
0).

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION With reference to the accompanying drawings, the C of the present invention
An embodiment of the rate matching method in DMA will be described.

In CDMA, a plurality of TrCHs (Tra
RM (Rate Matching) used in rate matching at the time of multiplex of transport channels (nsport channels)
By changing the attribute value for each TrCH, each TrC
The rate matching rate at H can be changed. Therefore, depending on the channel quality, the retransmission status of the control channel, etc., the RM attribute value of the specific channel such as the control channel is increased by TTI (T
transmission time interval
By controlling every l), the transmission quality of a specific channel such as a control channel can be improved.

Referring to FIGS. 1 and 2, a block diagram is shown as an embodiment of the present invention. Figure 1
It is a block diagram which shows schematic structure of the terminal side transmission / reception part of a CDMA system. FIG. 2 is a block diagram showing a schematic configuration of a base station side transmitting / receiving section of the CDMA system.

As shown in FIG. 1, the transmission section of the terminal side transmission / reception section 10 of the terminal that transmits / receives data to / from the base station has CRC (C
Cyclone Redundancy Check) addition units 8-1 to 8-I are provided. CRC adder 8-
1 to 8-I encode information data by adding a CRC.

On the output side of the CRC adders 8-1 to 8-I, channel coding (Channel co) is performed corresponding to each of a plurality of transport channels # 1 ... #I.
ding) units 9-1 to 9-I are connected. The channel coding units 9-1 to 9-I perform channel coding on the coded information data using a convolutional code, a turbo code, or the like.

On the output side of the channel coding units 9-1 to 9-I, rate matching (Rate Mat) is associated with each of the plurality of transport channels # 1 ... #I.
ching) units 13-1 to 13-I are connected.
The rate matching units 13-1 to 13-I respectively input the channel-encoded data and perform rate matching by repetition or puncturing of the input information data sequence. By rate matching, the coding rate is made variable and adjusted to the number of bits that can be transmitted in the wireless section.

A plurality of transport channels # 1 ... #I are provided on the output side of the rate matching units 13-1 to 13-I.
Corresponding to each of the
ave) units 14-1 to 14-I are connected to each other. The interleaving units 14-1 to 14-I each receive the rate-matched information data and interleave the bits of the input information data with different interleaving patterns to improve resistance to burst errors.

On the output side of the interleaving units 14-1 to 14-I, transport channel multiplexing (TrCH M
A multiplex unit 15 is connected. The transport channel multiplexer 15 multiplexes a plurality of transport channels # 1 ... #I.

A mapping (Physical Channel) is provided on the output side of the transport channel multiplexer 15.
el Mapping section 16 is connected. The mapping unit 16 inputs the multiplexed information data, and inputs the input information data in a predetermined format.
PDCH (Dedicated Physical D)
(data channel) physical channel.

A diffusion processing unit 17 is connected to the output side of the mapping unit 16. The spread processing unit 17 has a spread code, receives the data output from the mapping unit 16, spreads the input data using the spread code, and transmits the spread data.

Specific Transport Channel (Trans
The port channel) determining unit 11 inputs the data input to the CRC adding units 8-1 to 8-I and determines whether a specific transport channel such as a control channel is multiplexed. The determination result is the RM attribute (att
Rib)) sent to the decision unit 12.

The RM attribute determination unit 12 performs closed-loop control on the line quality information indicating the reception line quality of the base station, which is output from the line quality information extraction unit 21, thereby performing rate matching units 13-1 to 13-I. RM attribute (RM attribute) used for rate matching in
Determine the value. The determined RM attribute values are sent to the rate matching units 13-1 to 13-I, respectively. Further, the determined RM attribute value is TFCI (Trans
sport Format Combination
(Indicator) is sent to the multiplexing unit 18.

Further, the RM attribute determination unit 12 includes retransmission information of the control channel in the upper layer of the specific transport channel such as the control channel, and the transport channel # 1 ... It is also possible to determine the RM attribute value of the.

With the above-mentioned configuration of the terminal side transmitting / receiving section 10, the operation is outlined as follows.

The data for each of the transport channels # 1 ... #I has a CRC for each of the transport channels # 1 to #I.
(Cyclic Redundancy Check)
Channel coding section 9-
1 to 9-I are used for convolutional coding or Turbo coding.

After that, the rate matching units 13-1 to 13-I of the respective transport channels # 1 to #I.
Performs rate matching using the RM attribute value determined by the RM attribute determination unit 12.

Further, DPDCH (Dedicated)
When a variable symbol rate transmission of Physical Data Channel) is performed, the symbol rate to be used can be changed according to the RM attribute value.

After that, transport channels # 1 to #
After interleaving for each I (see reference numeral 14), the transport channels # 1 to #I are multiplexed (Mu).
ltiplex) (see reference numeral 15), and DPDCH
Is mapped to the physical channel (see reference numeral 16), spread, and transmitted (see reference numeral 17).

On the output side of the RM attribute determination unit 12, the TFC
The I multiplexer 18 is connected. TFCI multiplexer 18
Inputs the RM attribute value determined by the RM attribute determination unit 12. The TFCI multiplexing unit 18 uses the information indicating which transport channel # 1 to #I used which RM attribute value as the TFCI information indicating the transport channel multiplexing information in each frame and the like by using the DPCCH (Ded).
icated Physical Control
Channel) and outputs it to the spreading processing unit 19 as transmission data DPCCH.

The TFCI multiplexing unit 18 includes a spreading processing unit 19
Are connected. The spreading processing unit 19 spreads the transmission data DPCCH input from the TFCI multiplexing unit 18, and transmits the data.

Further, the terminal side transmitting / receiving section 10 is provided with a despreading processing section 22. The despreading processing unit 22 despreads the received signal from the base station, and receives the received data DPC.
It is output to the line quality information extraction unit 21 as CH.

The output side of the despreading processing section 22 is connected to the line quality information extracting section 21. The line quality information extraction unit 21 receives the received data DP input from the despreading processing unit 22.
The line quality information is extracted from the CCH, and the RM attribute determination unit 12
Output to.

Next, referring to FIG. 2, the CD of the present embodiment.
The base station side transceiver unit 30 of the MA system will be described.

As shown in FIG. 2, a despreading processing section 38 is provided in the receiving section of the base station side transmitting / receiving section 30 of the base station transmitting / receiving with the terminal. The despreading processing unit 38 despreads the transmission data DPCCH from the spreading processing unit 19 of the transmitting unit of the terminal side transmitting / receiving unit 10 and receives the received data DPCCH.
Is output.

On the output side of the despreading processing unit 38, the TFCI
The extraction unit 37 is connected. The TFCI extraction unit 37
The received data DPCCH is input from the despreading processing unit 38,
Information of the TFCI portion of the DPCCH is decoded and output.

The RM attribute determination unit 36 is connected to the output side of the TFCI extraction unit 37. RM attribute determination unit 36
Is the T of the DPCCH decoded from the TFCI extraction unit 37.
The information of the FCI part is input, and the RM attribute used on the transmitting side is determined.

Further, on the output side of the despreading processing section 38,
The line quality measuring unit 39 is connected. The line quality measuring unit 39 receives the received data D output from the despreading processing unit 38.
The PCCH is input, the reception SIR is measured from the pilot portion of the reception data DPCCH, and the line quality information indicating the line quality is obtained.

A line quality information multiplexing unit 40 is connected to the output side of the line quality measuring unit 39. Channel quality information multiplexing section 40 receives the channel quality information from channel quality measuring section 39, multiplexes it on DPCCH, and outputs it to spreading processing section 43 as transmission data DPCCH.

A spread processing unit 43 is connected to the line quality information multiplexing unit 40. Spreading processing section 43 receives the transmission data DPCCH from channel quality information multiplexing section 40, spreads it, and transmits it. The data transmitted from the spreading processing unit 43 is received as the reception data DPCCH by the despreading processing unit 22 of the terminal side transmitting / receiving unit 10.

Further, the receiving section of the base station side transmitting / receiving section 30 is provided with a despreading processing section 31. The despreading processing unit 31 sends the transmission data DP transmitted from the spreading processing unit 17.
The DCH is received, the despreading process is performed by the spreading code, and the received data DPDCH is demapped (Demappin
g) Output to 32.

A demapping unit 32 is connected to the output side of the despreading processing unit 31. The demapping unit 32 is
The received data DPDCH is input and demapping is performed.
The demapped data is output to the demultiplexing unit 33.

A demultiplexing unit 33 is connected to the output side of the demapping unit 32. The demultiplexing unit 33 demultiplexes the input demapped data for each transport channel # 1 to #I, and deinterleaves (Deinterleave) units 34-1 to 34-34 for each transport channel # 1 to #I.
Output to I respectively.

The demultiplexing unit 33 includes a deinterleaving unit 3
4-1 to 34-I are connected. Each of the deinterleaving units 34-1 to 34-I has a transport channel # 1 for the data input from the demultiplexing unit 33.
Deinterleaving is performed with a different deinterleaving pattern for each #I. That is, the interleaving units 14-1 to 14-1
The interleave pattern used in each of 4-I is used as the deinterleave pattern.

Rate dematching (Rate Dematch) is provided on the output side of the deinterleave units 34-1 to 34-I.
ching) units 35-1 to 35-I are connected to each other. The rate dematching units 35-1 to 35-I
For the data respectively input from the deinterleaving units 34-1 to 34-I, the RM attribute (rate dematch pattern) different for each of the transport channels # 1 to #I determined by the RM attribute determination unit 36 is used. , Rate dematch. Rate matching is repeat
In the case of an edition, the bits that have been repeated are soft-decision-synthesized. The data subjected to rate dematching by the rate dematching units 35-1 to 35-I are output to the channel decoding units 41-1 to 41-I.

Rate dematching units 35-1 to 35-I
Channel decoding (Channel Decodi
ng) units 41-1 to 41-I are connected to each other. Each of the channel decoding units 41-1 to 41-I performs channel decoding processing on the input rate-dematched data by convolutional decoding or turbo decoding.

CRC check units 42-1 to 42-I are connected to the channel decoding units 41-1 to 41-I, respectively. CRC check units 42-1 to 42-I
Inputs the data from the channel decoding units 41-1 to 41-I and performs a CRC check. CRC check unit 4
The data whose CRC has been confirmed by 2-1 to 42-I is sent to the transmission path for each transport channel.

Next, the operation of this embodiment will be described.

On the terminal transmission side, a CRC is added to each of the transport channels # 1 to #I (reference numerals 8-1 to 8-).
I), data (codes 9-1 to 9-I) channel-coded by a convolutional code, a Turbo code, or the like are input to the rate matching units 13-1 to 13-I of the transport channels # 1 to #I, respectively. To be done.

The rate matching units 13-1 to 13-I perform repetition or puncturing of the input data sequence in order to adjust the number of bits that can be transmitted in the wireless section.

The rate matching units 13-1 to 13-
The RM attribute value used in I is extracted by the line quality information extraction unit 21 and information indicating whether or not a specific channel such as a control channel determined by the specific transport channel determination unit 11 is multiplexed. It is determined by the RM attribute determination unit 12 based on the channel quality information indicating the channel quality transmitted from the base station.

The line quality information detected by the line quality information extraction unit 21 is determined by the closed loop control and adaptive control.

The RM attribute determining section 12 has, for example, a table shown in the table of FIG. As shown in FIG. 3, in the table, the RM attribute value is associated with the TFCI indicating the transport channel multiplexing information in each frame in advance. Particularly, in the case of TFCI = 3, 4, 5 in which a plurality of transport channels are multiplexed (T in FIG.
(Refer to the column of the number of rBk), the TFCI having a larger RM attribute is selected and transmitted as the reception channel quality on the base station side is worse due to the channel quality information transmitted from the base station side.

That is, in the example of FIG. 3, the RM attribute determining unit 12
When a plurality of transport channels are multiplexed, determines the reception line quality on the base station side in three stages based on the line quality information received from the line quality information extraction unit 21, and selects the reception line among the three stages. If the quality is the best level, RMCI attribute value of TFCI = 3: 150 is selected, and data indicating that the RM attribute value is 150 is transmitted to each of the rate matching units 13-1 to 13-I. To do. At that time, the RM attribute determination unit 12 transmits data indicating that the TFCI is 3 to the TFCI multiplexing unit 18. Similarly, the RM attribute determination unit 12 determines, based on the line quality information received from the line quality information extraction unit 21,
When the reception line quality is the medium level among the above three stages, the RM attribute value of TFCI = 4: 170 is selected, and the data indicating that the RM attribute value is 170 is sent to each rate matching unit 13-. 1 to 13-I.
At that time, the RM attribute determination unit 12 uses the TFCI multiplexing unit 18
The data indicating that the TFCI is 4 is transmitted. Similarly, based on the line quality information received from the line quality information extraction unit 21, the RM attribute determination unit 12 determines if the received line quality is the worst level among the above three stages.
The RM attribute value of FCI = 5: 230 is selected, and data indicating that the RM attribute value is 230 is transmitted to each of the rate matching units 13-1 to 13-I. At that time, the RM attribute determination unit 12 transmits data indicating that the TFCI is 5 to the TFCI multiplexing unit 18.

Further, retransmission information (information indicating the number of retransmissions) of a specific transport channel such as a control channel is included in an upper layer of a specific transport channel such as a control channel, and the retransmission information is included in the above-mentioned line. It can be used together with quality information. Since the number of retransmissions corresponds to the channel quality, the RM attribute determination unit 12 determines that the RM attribute value increases as the number of retransmissions of a specific transport channel such as a control channel increases, based on the retransmission information. Control to select TFCI. Note that the RM attribute determination unit 12 can also select the TFCI (RM attribute value) based on the retransmission information without using the line quality information.

In addition, when variable symbol rate transmission of DPDCH (see FIG. 5) is performed, depending on the RM attribute value,
You can change the symbol rate used. This may increase the transmission power, but the number of repetition bits can be increased, and the soft-decision combining on the receiving side can be expected to improve the transmission quality.

For example, as a method of determining the symbol rate (the number of bits of Ndata, j of DPDCH) used for each frame, when one physical channel is used, there is a method of obtaining as follows.

Ni and j are transport channels (Tr
CH) #i is the number of bits before rate matching with TFCj. Ndata, j (bits / frame
e) is the number of bits per frame that can be multiplexed on the physical channel (DPDCH) for TFCj. RMi is the RM attribute for transport channel #i.

Considering variable symbol rate transmission,
SE to get SF (Spreading Factor)
T0 = {N₂₅₆, N₁₂₈, N₆₄, N₃₂，
N₁₆, N ₈, N_Four} (See FIG. 6).

[Equation 1]

If SET1 is not negative and the smallest element in SET1 requires only one physical channel, then N _{data, j} = SET1 is the smallest value.

Where

[Equation 2] Indicates the minimum value in the element RMy (1 ≦ y ≦ I).

In the example of FIG. 3, the transport channel #
Assuming that N1, j of 1 is 129 bits and N2, j of transport channel # 2 is 1062 bits, the symbol rate of each frame is 120 with TFCI = 3.
240 ksps, TFCI = when ksps, TFCI = 4
It becomes 240 ksps at 5.

There is also a method of obtaining the number of bits (ΔNi, j) to be rate-matched from the number of bits (Ni, j) before rate matching for each transport channel as follows. ΔNi, j is the number of bits to be repeated when repetition is performed during rate matching, and is the number of bits to be punctured when puncturing is performed.

[0085]

[Equation 3]

In the example of FIG. 3, the transport channel #
When N1, j of 1 is 129 bits and N2, j of transport channel # 2 is 1062 bits, ΔN1, j of transport channel # 1 is 0 at TFCI = 3.
bits, TFCI = 4, 161 bits, TFCI =
5 with 247 bits, transport channel #
2 ΔN2, j is TFCI = 3, 9 bits, TFCI
= 4, 1048 bits, TFCI = 5, 962 bits
s.

An example of repetition or puncturing of rate matching is shown in FIGS. 4 (a) and 4 (b), respectively.

FIGS. 4A and 4B show the terminal side transmitting / receiving section 1
0-based rate matching and base station side transceiver unit 30
FIG. 6 is a diagram for explaining rate dematching according to FIG.

As shown in FIGS. 4A and 4B, the rate matching of the terminal side transmitting / receiving unit 10 and the base station side transmitting / receiving unit 3 are performed.
A rate dematching of 0 makes it possible to realize a variable coding rate. FIG. 4A shows an example of repetition from 6 bits to 8 bits. Bits 1 and 3 are repeated for the distributed input data to the rate matching unit.

FIG. 4B shows an example of puncturing from 10 bits to 8 bits. Bits 1 and 5 are punctured for the distributed input data to the rate matching unit.

As described above, as the number of repetitions increases, the same data is transmitted in a plurality of bits, and the soft-decision combining on the receiving side can improve the transmission quality.

Transport channel # 1 subjected to rate matching by the rate matching units 13-1 to 13-I
The data strings from #I to #I are interleaved by 14-1 to 14-
After being input to I and interleaved, respective transport channels # 1 to #I are multiplexed (code 1
5).

After that, the mapping section 16 maps the data as a DPDCH on the physical channel in the format as shown in FIG. 5, and the spreading processing section 17 spreads each data string with a different spreading code and transmits it.

On the receiving side of the base station, as shown by codes 31 and 38, after the DPCCH and DPDCH are despread by the despreading processing section by the respective spreading codes, the TFCI
The TFCI of the DPCCH section received by the extraction section 37 is decoded, and the RM attribute determination section 12 determines the RM attribute value used in the frame based on the TFCI.

As shown by reference numeral 32, after demapping from the physical channel of the DPDCH, demultiplexing is performed for each transport channel (see reference numeral 33), and then deinterleaved for each transport channel (reference numeral 34- 1 to 34-I). After that, the RM attribute determination unit 3
6 determines the TFCI received by the TFCI extraction unit 37, obtains the RM attribute of each transport channel based on the TFCI, and performs rate dematching using the RM attribute (reference numeral 35-1). ~ 35-
I).

An example of repetition or puncturing of rate dematching is shown in FIG.
It shows in (b).

FIG. 4A shows an example of repetition from 6 bits to 8 bits. Bits 1 and 3 that are repeated on the transmitting side are deleted from the distributed input data to the rate dematching units 35-1 to 35-I.

FIG. 4B shows an example of puncturing from 10 bits to 8 bits. Bits 1 and 5 punctured on the transmitting side are inserted into the distributed input data to the rate matching unit, but it becomes indefinite (indicated by D).

On the transmitting side, since the RM attribute of a specific transport channel such as a control channel becomes large depending on the line quality (the RM attribute becomes larger as the line quality becomes poorer), repetition is performed by rate matching. It is highly possible that the repetition bits are soft-decision-synthesized to improve the transmission quality of a specific transport channel such as a control channel.

The data after the soft decision combining is channel-decoded by convolutional decoding or Turbo decoding to obtain C
RC checked.

Further, the following operation is performed in order to perform the closed loop control for determining the RM attribute on the terminal transmission side.
Pi of the DPCCH received by the channel quality measuring unit 39 on the base station side
The reception SIR is measured from the lot unit, and the information indicating the measurement result is bit-converted by the line quality information multiplexing unit 40 to obtain the DPC.
It is multiplexed in the CH section, spread by the spreading processing section 43, and transmitted to the terminal.

FIG. 5 is a diagram for explaining an example of a radio frame configuration transmitted / received between the terminal side transmitting / receiving section 10 and the base station side transmitting / receiving section 30.

As shown in FIG. 5, the radio frame is a superframe having a period T _super = 2560 ms.
Frame # 0 to frame # 255 each having a period T _f = 10 ms.

Further, each frame has a period T.
Slot # 0 to slot # 1 with _s = 0.666 ms
It is composed of four.

Each slot has DPDCH # 0 to DPDC.
It is composed of H # I and DPCCH. Each DPDCH is N
It is composed of data of _data bits and is used for transmitting and receiving the same distributed data. DPCCH is N _pilot
Bit Pilot and N _TFCI Bit TFCI are used to transmit and receive information on the determined RM attribute and channel quality.

In the above description, the terminal is the transmitting side and the base station is the receiving side, but conversely, the terminal may be the receiving side and the base station is the transmitting side.

As described above, in this embodiment, in rate matching, rate matching is performed by using different RM attributes for each TTI in each transport channel. That is, it is necessary to improve the transmission quality in order to make retransmission less likely to occur on a specific channel such as a control channel. Therefore, depending on the line quality, T
The RM attribute value of a specific transport channel such as a control channel is set to be larger than the RM attribute value of another transport channel for each TI (see FIG. 3). As a result, the amount of repetition is increased by rate matching of a specific transport channel such as a control channel, and the transmission quality can be improved.

Further, retransmission information of a transport channel such as a control channel is included in an upper layer of a transport channel such as a control channel, and the RM attribute value of each transport channel is determined in consideration of the retransmission information. As a result, the transmission quality at the time of retransmission can be improved.

In order to determine the RM attribute value for each TTI, closed loop control is performed by transmitting line quality information indicating the received line quality of the base station from the base station side, and the information is used on the terminal side. .

[0110]

According to the rate matching method in CDMA of the present invention, the transmission quality of a specific channel such as a control channel can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a terminal side transmitting / receiving section according to an embodiment of a rate matching method in CDMA of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a base station side transmitting / receiving section according to an embodiment of a rate matching method in CDMA of the present invention.

FIG. 3 is a diagram illustrating a TFCI and RM att according to an embodiment of a rate matching method in CDMA of the present invention.
It is a figure which shows the relationship with a ribbon.

FIG. 4 is a diagram for explaining rate matching of a terminal side transmitting / receiving unit and rate dematching of a base station side transmitting / receiving unit according to an embodiment of a rate matching method in CDMA of the present invention.

FIG. 5 is a diagram showing a configuration example of a radio frame transmitted / received between a terminal side transmitting / receiving unit and a base station side transmitting / receiving unit according to an embodiment of a rate matching method in CDMA of the present invention.

FIG. 6 is a diagram for explaining a symbol rate according to an embodiment of a rate matching method in CDMA of the present invention.

[Explanation of symbols]

8 CRC addition section 9 channel encoder 10 Terminal side transceiver 11 Specific transport channel determination unit 12 RM attribute determination unit 13 Rate matching section 14 Interleave section 15 Transport channel multiplexer 16 Mapping section 17 Diffusion processing unit 18 TFCI multiplexer 19 Diffusion processing unit 21 Line quality information extraction unit 22 Despreading processing unit 30 Base station side transceiver 31 despreading processing unit 32 Demapping section 33 demultiplexer 34 Deinterleave section 35 Rate Dematching Section 36 RM attribute determination unit 37 TFCI extractor 38 despreading processing unit 39 Line quality measurement section 40 Channel quality information multiplexer 41 channel decoding unit 42 CRC check section 43 Diffusion processing unit

Claims (9)

[Claims] 1. A CDMA (Code Division)
A rate matching method in Multiple Access, comprising: (a) obtaining line quality information indicating a line quality used in the CDMA communication;
(B) setting a rate matching attribute value based on the line quality information, and (c) using the rate matching attribute value for each data of a plurality of transport channels including a specific transport channel. The rate matching performed in (c) when the quality of the line is low, so that the transmission quality of the specific transport channel is improved. A rate matching method in CDMA for setting a matching attribute value. 2. The rate matching method in CDMA according to claim 1, further comprising: (d) detecting the number of retransmissions of data of the specific transport channel, wherein (b) includes the line quality information and The rate matching attribute value is set based on the number of retransmissions, and (b) is the rate matching performed in (c) when the line quality is low and / or the number of retransmissions is large. 2. The rate matching method in CDMA, wherein the rate matching attribute value is set so that the transmission quality of the specific transport channel is improved. 3. The rate matching method in CDMA according to claim 1 or 2, wherein in (b), the rate matching of the specific transport channel performed in (c) is performed when the quality of the line is low. In the repetition (Rep
A rate matching method in CDMA in which the rate matching attribute value is set so as to increase the possibility of performing an edition. 4. The rate matching method in CDMA according to any one of claims 1 to 3, wherein in (b), the rate matching in (c) is performed when the line quality is low. Data repetition (Rep
The rate matching method in CDMA in which the rate matching attribute value of the specific transport channel and the rate matching attribute value of transport channels other than the specific transport channel are set to different values so that the amount of . 5. The rate matching method in CDMA according to claim 1, wherein the (b) is TTI (Transmission T).
A rate matching method in CDMA performed for each time interval. 6. The rate matching method in CDMA according to any one of claims 1 to 5, wherein (b) performs closed-loop control of the information indicating the receiving channel quality of the base station as the channel quality information. A rate matching method in CDMA by which the rate matching attribute value is set. 7. The rate matching method in CDMA according to any one of claims 1 to 6, wherein the specific transport channel is a control channel. 8. The rate matching method in CDMA according to claim 1, further comprising (e) a DPDCH (Dedicated Physica) based on the rate matching attribute value.
l Data Channel) rate matching method in CDMA comprising the step of changing the symbol rate. 9. A CDMA (Code Division)
A Multiple Access terminal, which is a line quality information detecting unit that obtains line quality information indicating the quality of a line used in the CDMA communication, and a rate matching attribute that sets a rate matching attribute value based on the line quality information. A value setting unit and a rate matching unit that rate-matches each data of a plurality of transport channels including a specific transport channel using the rate matching attribute value, wherein the rate matching attribute value setting unit is A CDMA terminal that sets the rate matching attribute value so that the transmission quality of the specific transport channel is improved in the rate matching performed by the rate matching unit when the line quality is low.