JP3522700B2 - Channel detecting device and channel detecting method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel detection device and a channel detection method for detecting a reference channel and a dependent channel when performing blind data rate determination.

[0002]

2. Description of the Related Art In a third generation mobile communication system using a CDMA system, the data rate is TTI (Tran).
It has been proposed to perform variable rate transmission with variable smission time interval). The TTI is
The data transmission length is defined for each channel, and the length is either 1, 2, 4 or 8 frames.

Further, the channel detection device on the receiver side is
A so-called blind data rate determination (Blind Tr) is used to determine a data rate without using data rate identification information such as FCI (Transport Format Combination Indicator).
ansport Format Detection: hereinafter referred to as "BTFD") has been proposed.

[0004] As a conventional BTFD channel detection device, there is one which utilizes the following restrictions (1) to (10) in the BTFD described in 3GPP standard TS25.212 ver3.4.0. In this detection device, the channels that meet the following items are the reference channels (Explicit
ly Detected Channel). Channels not related to rate judgment are dependent channels (Guided Chann
el), each dependent channel is dependent on one of the reference channels, and the data rate of the dependent channel is uniquely determined with respect to the reference channel.

(1) CCTrCH (Coded Composite Transpor
There is only one t CHannel). (2) The number of bits included in CCTrCH is 600 bits or less. (3) TFCI (Transport Format Combination Indic)
ator) number is 64 or less. (4) DTX Position is always Fixed Position. (5) Convolutional coding is used for all reference channels. (6) CRC is present in all Transport Blocks of all reference channels. (7) The number of reference channels is 3 or less. (8) The number of Code Blocks in the reference channel is 1. (9) Data rate candidates for all reference channels (T
The total number of F: Transport Formats is 16 or less. (10) There is at least one TrCH that can be used for guidance for all TrCHs for which guidance determination is performed.

[0006]

[Problems to be Solved by the Invention] However, the above 3G
PP standard TS25.212 ver3.4.0 is for which channel B
There is no criterion for performing TFD, and an algorithm for determining which subordinate channel depends on each reference channel when there are multiple reference channels is not specified. Therefore, there is a possibility that the relationship between the reference channel and the dependent channel detected by the channel detection device may be erroneously detected, and it is expected that the reception performance such as BER (Bit Error Rate) characteristics will be affected.

The present invention has been made in view of the above circumstances, and provides a channel detecting apparatus and a channel detecting method capable of accurately detecting a reference channel and a dependent channel dependent on each reference channel. With the goal.

[0008]

SUMMARY OF THE INVENTION A channel detecting apparatus of the present invention convolves a blind data rate when performing a blind data rate determination.
Only encoding is used, all transports
CRC bits are present in the block and code
A first condition is that the number of blocks is 1, and a reference channel detecting means for detecting a channel satisfying the first condition as a reference channel, a reference channel and a slave subordinate thereto.
The data transmission length of the general channel is the same, and
Number of quasi-channel data rate candidates depends on it
Article 2 must be more than the number of data rate candidates for the channel
And a dependent channel detecting means for detecting a dependent channel dependent on the reference channel based on the second condition.

[0009]

[0010]

With this configuration, the reference channel and the subordinate channels subordinate to the reference channel can be accurately detected.

In the channel detecting device of the present invention, the dependent channel detecting means changes the data rate of the reference channel.
If the data rate of the dependent channel has changed
The dependent channel is not dependent on the reference channel
This is the third condition, and the configuration is such that, based on the third condition, the reference channels that are candidates for the subordinate destination are narrowed down for each subordinate channel, and then the subordinate channels that are subordinate to the reference channel are detected.

[0013]

With this configuration, it is possible to narrow down the candidates of the reference channels to which the subordinate channels are subordinated in advance, so that the subordinate channels subordinate to the reference channel can be detected quickly.

A CDMA communication terminal device of the present invention has a configuration including any one of the above channel detecting devices.

With this configuration, it is possible to accurately detect the reference channel and the subordinate channels subordinate to each reference channel, so that it is possible to improve the reception performance such as BER (Bit Error Rate) characteristics.

The channel detection method of the present invention does not use convolutional coding when performing blind data rate determination .
That all transport blocks are CR
If there are C bits and the number of code blocks is 1,
A certain condition as a first condition, and detecting a channel satisfying the first condition as a reference channel;
And the data transmission length of the subordinate channel
And the number of data rate candidates for the reference channel is
More than the number of data rate candidates of the subordinate channels dependent on it
A second condition that is, detecting the subordinate channel that is subordinate to each reference channel based on the second condition
And a method including:

By this method, it is possible to accurately detect the reference channel and the subordinate channels subordinate to each reference channel.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The essence of the present invention is to narrow down the reference channel candidates to which the subordinate channels are subordinates based on the data rate candidates for each channel, the combination thereof and the number thereof. Also, the TT related to the reference channel
I, the number of data rate candidates (hereinafter referred to as “the number of TFs”) and the TTIs and TFs of the dependent channels are considered to detect the reference channel to which the dependent channels depend.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a channel detection apparatus according to an embodiment of the present invention. The channel detection device shown in FIG. 1 is installed in a communication terminal device such as a mobile phone in a CDMA mobile communication system. FIG. 2 is a diagram showing an example of parameter values of each channel detected by the channel detection device according to the embodiment of the present invention.

In the present embodiment, the data transmitted from the communication partner is an interleave process in which digital data of "0" or "1" is error-correction coded at a predetermined coding rate and a predetermined constraint length. After that, it is assumed that the data is spread-modulated and converted into "1" or "-1".
In addition, the data rate of the data to be transmitted is assumed to be one selected from M types (M is a natural number) of data rates before the error correction coding of the data in units of TTI.

The channel detecting apparatus shown in FIG. 1 is mainly composed of a BTFD discriminating section 101, a reference channel detecting section 102 and a dependent channel detecting section 103. The dependent channel detecting section 103 includes a dependent channel candidate narrowing section 151. , And a dependent channel determination unit 152.

The BTFD discrimination unit 101 determines the number of CCTrCHs,
Number of bits included in CCTrCH, number of TFCI, and DTX Posi
It is determined whether or not the BTFD is set based on the parameter group A including the option and the fact is notified to an error correction decoding device (not shown). That is, 3GPP standard TS25.212 ve
Among the restrictions on BTFD described in r3.4.0, if the following (1) to (4) are applicable, it is determined that BTFD is performed.

(1) There is only one CCTrCH. (2) The number of bits included in CCTrCH is 600 bits or less. (3) The number of TFCI is 64 or less. (4) DTX Position is Fixed Position.

The reference channel detection unit 102 detects the reference channel based on the parameter group B including the coding type for each channel, the number of CRC bits, and the number of Code Blocks. That is, the following (5) of the restrictions in BTFD described in 3GPP standard TS25.212 ver3.4.0:
A channel that meets the conditions (6) and (8) is detected as a reference channel.

(5) Convolutional coding is used for all reference channels. (6) CRC is present in all Transport Blocks of all reference channels. (8) The number of Code Blocks in the reference channel is 1.

For example, in the case of FIG. 2, Ch0 and Ch3 are detected as reference channels because all the above conditions are met, and Ch1 and Ch2 are detected as subordinate channels because there is no CRC bit.

The subordinate channel candidate narrowing unit 151 of the subordinate channel detecting unit 103, based on the parameter group C1 consisting of the data rate candidates for each channel, the combination thereof, and the number thereof, selects the reference channel of the subordinate destination of each subordinate channel. Narrow down the candidates. Specifically, based on the principle that the data rate of the dependent channel is uniquely determined with respect to the reference channel, if the data rate of the dependent channel changes while the data rate of the reference channel does not change, the dependent channel is Since the theorem that it does not depend on the reference channel is introduced, this theorem is applied to detect candidate channels that depend on a certain reference channel by the elimination method.

For example, in FIG. 2, the reference channel Ch
0 and the dependent channel Ch1, if the data rate of Ch0 is TF0, the data rate of Ch1 is always T
If it is F0 and the data rate of Ch0 is TF1, then C
The data rate of h1 is always TF0, and if the data rate of Ch0 is TF2, the data rate of Ch1 is always TF1. Therefore, Ch1 may be a channel dependent on Ch0. Next, the reference channel Ch3
When the data rate of Ch3 is TF0, the data rate of Ch1 is TF0 and TF1. Therefore, there is no possibility that Ch1 depends on Ch3.

As described above, by narrowing down the candidates of the reference channel to which the subordinate channels are subordinate to in advance, the subordinate channels subordinate to the reference channel can be detected quickly.

The subordinate channel determining unit 152 of the subordinate channel detecting unit 103 determines a reference channel to which each subordinate channel is subordinate, based on the parameter group C2 including the TTI and the TF number for each channel. That is, attention is paid to the fact that the TTI of the reference channel is the same as the TTI of the dependent channel and that the TF number of the reference channel is equal to or larger than the TF number of the dependent channel dependent on the reference channel. It is determined whether all the conditions of are met. Then, the dependent channel determination unit 1
For each dependent channel, 52 detects a reference channel that meets all the conditions as a dependent destination channel of the dependent channel.

For example, in FIG. 2, the reference channel Ch
0 and the dependent channel Ch1, Ch0 and Ch
Both TTIs of 1 are 20 ms and are the same. Also, since the TF number of Ch0 is “3” and the TF number of Ch1 is “2”,
The condition that the TF number of Ch0 is equal to or larger than the TF number of Ch1 is satisfied. Therefore, Ch1 can be detected as a channel dependent on Ch0.

Thus, the TTI and T for each channel are
By paying attention to the F number, it is possible to accurately detect the reference channel to which each subordinate channel depends.

[0035]

As described above, according to the present invention,
By paying attention to the data rate candidates for each channel, their combinations and numbers, and the number of TTIs and TFs for each channel, it is possible to accurately detect the reference channel and the dependent channels dependent on each reference channel. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a channel detection device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of parameter values of each channel detected by the channel detection device according to the above embodiment.

[Explanation of symbols]

101 BTFD discrimination section 102 reference channel detector 103 Subordinate channel detection unit 151 Subordinate Channel Candidate Narrowing Unit 152 Subordinate channel determination unit

─────────────────────────────────────────────────── ─── Continued Front Page (56) References Technical Specification Group Radio Access Network Multiplexing and channel coding (FDD), 3GPP TS 25.212, March 4th, 2000, April, 2000. , 4.3.1, Annex A (58) Fields investigated (Int.Cl. ⁷ , DB name) H04J 13/00-13/06 H04B 1/69-1/713 H04Q 7/38

Claims (4)

(57) [Claims] 1. Convolutional coding is used when performing blind data rate determination,
CRC bit exists in the transport block,
And the first condition is that the number of code blocks is 1,
A reference channel detection means for detecting said first condition is satisfied channel as a reference channel, the data of the reference channel and subordinate channel which is subordinate thereto feeding
The same channel length and the reference channel data
The number of candidate
That is collected by the number of candidates than the second condition, the channel detecting apparatus characterized by comprising a subordinate channel detection means for detecting a subordinate channel which is subordinate to the reference channel, the based on the second condition. 2. The dependent channel detecting means is a reference channel.
The data rate of the
If the data rate changes,
A third condition is that the reference channel is not subordinate to the reference channel, and the subordinate channels dependent on the reference channel are detected after narrowing down the reference channels that are candidates for the subordinate destination for each subordinate channel based on the third condition. The channel detection device according to claim 1 . 3. A CDMA communication terminal device comprising the channel detection device according to claim 1 or 2 . 4. Convolutional coding is used when performing blind data rate determination , and all trajectories are used.
CRC bit exists in the transport block,
And the first condition is that the number of code blocks is 1,
Detecting said first condition is satisfied channel as a reference channel, the data of the reference channel and subordinate channel which is subordinate thereto feeding
The same channel length and the reference channel data
The number of candidate
That is collected by the number of candidates than the second condition, the channel detecting method characterized by comprising the step, a detecting subordinate channel is subordinate to each reference channel based on the second condition.