JP2001217895A - Mapping information determination device and mapping information determination method - Google Patents

Abstract

(57) [Summary] [Problem] To correctly decode data even when TFCI indicates a value out of a specified range. SOLUTION: A TFCI determination unit 102 determines whether or not TFCI indicating the content of mapping information having different transmission rates mapped in a received radio frame is the same as a predetermined value. When the TFCI is the same as the specified value, the TFCI is overwritten and
03, and if the TFCI is different from the specified value as a result of the previous determination, the data decoding unit 104
Decrypts the mapping information according to.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system for transmitting information between a base station and a mobile station such as a mobile phone or an information terminal having a mobile phone function and a computer function in a mobile communication system. The present invention relates to a mapping information determination device and a mapping information determination method for performing a process of determining service multiplex information.

[0002]

2. Description of the Related Art In recent years, in the field of digital communication such as cellular telephone communication and satellite communication, information such as voice and packet having different services (different transmission rates) is mapped in the same radio frame and transmitted over the radio. A method has been required.

In response to such a request, for example, an information bit TFCI (Transport Format Combination Indicator) indicating the content of information mapped at different transmission rates is used.
A method has been devised in which r) is newly provided and transmitted by being carried on a radio frame.

[0004]

However, in the conventional device, since the TFCI is not subjected to error correction coding, there is a high possibility that a bit error will occur on the radio. Indicates a non-specified value different from the predetermined specified value. In this case, on the receiving side decoding the data with reference to the TFCI,
There is a problem that data decoding is not performed correctly.

[0005] The present invention has been made in view of the above, and provides a mapping information determination apparatus and a mapping information determination method that can correctly decode data even when the TFCI indicates a value out of the specified range. With the goal.

[0006]

According to the present invention, there is provided a mapping information judging device comprising a TFCI indicating the contents of mapping information having different transmission rates mapped in a received radio frame.
Is equal to or smaller than a predetermined value.
Determining means, storing means for overwriting and storing the TFCI when the result of the determination is that the TFCI is the same as the specified value, and subjecting the determination if the result of the determination is that the TFCI is the same as the specified value And decoding means for decoding the mapping information according to the TFCI stored in the storage means if the value is different from the specified value.

[0007] According to this configuration, even if the TFCI is an unspecified value, the T within the specification used in the previous received frame is used.
Since the mapping information can be decoded with reference to the FCI, the mapping information can be correctly decoded.

[0008] The mapping information determination apparatus of the present invention, in the above configuration, includes a second determination means for determining whether the wireless state is a synchronous state or an asynchronous state from a SW indicating a wireless synchronous / asynchronous state, and the first determination means. Employs a configuration in which, when the second determination unit determines that the synchronization state is established, whether the TFCI is equal to a predetermined value is determined.

According to this configuration, the radio synchronization state is also TFC
Since it was added as a condition for determining the appropriateness of I,
Since the reliability of the TFCI can be further increased, and thereby a more reliable TFCI can be referred to, the mapping information can be more correctly decoded.

[0010] The mapping information judging device of the present invention, in the above configuration, comprises a third judging means for judging whether or not the data has an error from an error detection code added to the data decoded by the decoding means. The storage means overwrites and stores the TFCI determined to be the same as the specified value by the first determination means when there is no error as a result of the determination.

[0011] According to this configuration, the error determination based on the error detection code added to the decoded data is also added as a condition for determining the appropriateness of the TFCI.
Can be further improved, and a more reliable TFCI can be referred to, so that the mapping information can be decoded more correctly.

A mobile station apparatus according to the present invention employs a configuration including a mapping information determination device having the same configuration as any of the above.

According to this configuration, in the mobile station device,
The same operation and effect as any of the above can be obtained.

The base station apparatus of the present invention employs a configuration including a mapping information determination device having the same configuration as any of the above.

According to this configuration, in the base station apparatus,
The same operation and effect as any of the above can be obtained.

The mobile communication system of the present invention employs a configuration including the mobile station device or the base station device having the above configuration.

According to this configuration, in the mobile communication system, the same operation and effect as any of the above can be obtained.

According to the mapping information determination method of the present invention, it is determined whether or not the TFCI indicating the contents of the mapping information having different transmission rates mapped in the received radio frame is the same as a predetermined value. As a result, the T
When the FCI is the same as the specified value, the TFCI is overwritten and stored, and when the determination result indicates that the TFCI is different from the specified value, the mapping information is decoded according to the stored TFCI.

According to this method, even if the TFCI is an unspecified value, the T within the specification used in the previous received frame is used.
Since the mapping information can be decoded with reference to the FCI, the mapping information can be correctly decoded.

According to the mapping information determination method of the present invention, in the above-mentioned method, a radio synchronous / asynchronous state is determined, and when it is determined that the radio signal is in a synchronous state, it is determined whether the TFCI is equal to a predetermined value. I did it.

According to this method, the radio synchronization state is also TFC
Since it was added as a condition for determining the appropriateness of I,
Since the reliability of the TFCI can be further increased, and thereby a more reliable TFCI can be referred to, the mapping information can be more correctly decoded.

According to the mapping information determination method of the present invention, in the above method, it is determined whether or not there is an error in the decoded data, and if there is no error, the TFCI determined to be the same as the specified value is overwritten. I tried to remember.

According to this method, the error judgment of the decoded data is added as a condition for judging the appropriateness of the TFCI, so that the reliability of the TFCI can be further increased, and thereby the reliability of the TFCI can be increased. Since a high TFCI can be referred to, mapping information can be decoded more correctly.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a mapping information determination apparatus according to Embodiment 1 of the present invention.

The mapping information determining apparatus 100 according to the first embodiment shown in FIG. 1 is a receiving side of a mobile station apparatus such as a mobile phone in a mobile communication system or an information terminal apparatus having a mobile phone function and a computer function. Or
It is applied to the receiving side of a base station apparatus that performs wireless communication with a mobile station apparatus, and includes an input unit 101 and a TFCI determination unit 1
02, the TFCI storage unit 103, and the data decoding unit 104
And an output unit 105.

The input unit 101 is an I / O interface, and receives a radio frame output from a synchronous detection unit of a radio (not shown) or a radio frame subjected to convolutional coding.

The TFCI determination unit 102 compares the TFCI output from the synchronous detection unit of the radio with a specified value stored in a storage table in advance to determine whether the TFCI is a specified value or a non-specified value. Is determined, and if the value is within the regulation, T
The FCI is stored in the TFCI storage unit 103, and the service mapping information in the radio frame is stored in the data decoding unit 1.
04.

The TFCI storage unit 103 stores the TFCI input from the TFCI determination unit 102 into a TFC
I is stored until I is received.

The data decoding section 104 has a TFCI determination section 1
It decodes the mapping information for each service in accordance with the TFCI input from 02.

The output unit 105 outputs the data decoded by the data decoding unit 104 to a signal processing unit (not shown).
Interface.

The operation of the mapping information determination device 100 thus configured will be described with reference to the flowchart of FIG.

In step ST 201, the received radio frame is transmitted to TFCI determination section 1 via input section 101.
When input to 02, the TFCI determination unit 102 determines whether the TFCI in the radio frame is within a specified value.

If the result of this determination is within the specified value, in step ST202, the TFCI is stored in the TFCI storage unit 103 until the next received radio frame is input, and in step ST203, the data decoding unit 1
04 is the TFCI notified from the TFCI determination unit 102.
, And decodes the mapping information for each service, and outputs the result to the output unit 105.

On the other hand, as a result of the judgment in step ST201, T
If the FCI is outside the specified value, in step ST204, the TFCI determination unit 102 reads the previously received TFCI stored in the TFCI storage unit 103 and outputs it to the data decoding unit 104.
In T205, decoding information is decoded according to the TFCI and output to output section 105. The TFCI outside the specified value is discarded by the TFCI determination unit 102.

As described above, according to mapping information determination apparatus 100 of the first embodiment, even if TFCI is an unspecified value, the TFC within the specification used in the previous received frame is used.
Since the mapping information is decoded with reference to I, even if the TFCI received this time is a non-specified value,
The mapping information can be correctly decoded. As a result, it is possible to improve reception characteristics without losing a decoding opportunity.

(Embodiment 2) FIG. 3 is a block diagram showing a configuration of a mapping information determining apparatus according to Embodiment 2 of the present invention. However, in the second embodiment shown in FIG. 3, parts corresponding to those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The difference between mapping information determination apparatus 300 of the second embodiment shown in FIG. 3 and apparatus 100 of the first embodiment is that an SW (Sync Word) SW is provided between input section 101 and TFCI determination section 102. The determination unit 301 is connected.

The SW determining unit 301 determines from the SW which is information indicating the synchronous / asynchronous state of the wireless frame output to the input unit 101 simultaneously with the wireless frame by the synchronous detector of the wireless device.
The synchronous / asynchronous state of the radio frame is determined, and the result of the determination is output to the TFCI determining unit 102.

The operation of the mapping information determination device 200 thus configured will be described with reference to the flowchart of FIG.

In step ST401, when the wireless frame and the SW are input to the SW determining unit 301 via the input unit 101, the SW determining unit 301 determines from the SW whether the wireless frame is in a synchronous state or an asynchronous state.

As a result of this determination, when it is determined that the mobile terminal is in the synchronization state (OK), in step ST402, TFCI determining section 102 determines whether or not the TFCI in the radio frame is within a specified value.

If the result of this determination is within the specified value, in step ST403, the TFCI is stored in the TFCI storage unit 103 until the next received radio frame is input, and in step ST404, the data decoding unit 1
04 is the TFCI notified from the TFCI determination unit 102.
, And decodes the mapping information for each service, and outputs the result to the output unit 105.

On the other hand, if the result of the determination in step ST401 is out of synchronization (NG), and if the result of the determination in step ST402 indicates that the TFCI is outside the specified value, then in step ST405, the TFCI determination section 102
Reads the previously received TFCI stored in the I storage unit 103 and outputs it to the data decoding unit 104,
4 decodes the mapping information according to the TFCI in step ST406 and outputs it to output section 105.

As described above, according to the mapping information determination apparatus 300 of the second embodiment, the wireless synchronization state such as the SW is added as a condition for determining the appropriateness of the TFCI. Since it is possible to refer to a more reliable TFCI, it is possible to decode the mapping information more correctly. As a result, it is possible to improve reception characteristics without losing a decoding opportunity.

(Embodiment 3) FIG. 5 is a block diagram showing a configuration of a mapping information determination apparatus according to Embodiment 3 of the present invention. However, in the third embodiment shown in FIG. 5, portions corresponding to the respective portions of the second embodiment in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

The mapping information determination apparatus 500 of the third embodiment shown in FIG. 5 differs from the apparatus 300 of the second embodiment in that a CRC (Cyclic Redundancy Check) is provided between the data decoding section 104 and the output section 105. ) The determination unit 501 is connected.

[0048] The CRC determination section 501 is
The parity check is performed from the CRC added to the data decoded in step 4 to determine whether there is an error in the data.

The operation of the mapping information determination device 500 thus configured will be described with reference to the flowchart of FIG.

In step ST601, when the wireless frame and the SW are input to the SW determining unit 301 via the input unit 101, the SW determining unit 301 determines from the SW whether the wireless frame is in a synchronous state or an asynchronous state.

If it is determined that the synchronization state (OK) is obtained, in step ST602, TFCI determining section 102 determines whether the TFCI in the radio frame is within a specified value.

If the result of this determination is within the specified value, in step ST603, data decoding section 104
It decodes mapping information for each service according to the TFCI notified from I determination section 102 and outputs the information to CRC determination section 501.

Next, in step ST604, CR
C determining section 501 performs a CRC determination on the decoded data. As a result, if there is no error in the CRC determination (if OK), in step ST605, TF
The CI storage unit 103 stores the TFC from the TFCI determination unit 102
It operates so as to store I and not store it if there is an error (if it is NG).

On the other hand, if the result of the determination in step ST601 is asynchronous (NG), and if the result of the determination in step ST602 indicates that the TFCI is outside the specified value, then in step ST606, TFCI determining section 102
Reads the previously received TFCI stored in the I storage unit 103 and outputs it to the data decoding unit 104,
4 decodes the mapping information according to the TFCI in step ST607 and outputs it to CRC determining section 501. Thereafter, the operations in steps ST604 and ST605 are performed.

As described above, according to mapping information determination apparatus 500 of the third embodiment, parity check on decoded data such as CRC determination is added as a condition for determining the appropriateness of TFCI. Can be further improved, and a more reliable TFCI can be referred to, so that the mapping information can be decoded more correctly. As a result, it is possible to improve reception characteristics without losing a decoding opportunity.

In the third embodiment, the CRC determining unit 501 is added to the configuration of the second embodiment.
May be added with a CRC determination unit 501.

[0057]

As described above, according to the present invention,
Even when the TFCI indicates a value outside the range, the data can be correctly decoded.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mapping information determination device according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart for explaining the operation of the mapping information determination device according to the first embodiment.

FIG. 3 is a block diagram showing a configuration of a mapping information determination device according to Embodiment 2 of the present invention.

FIG. 4 is a flowchart for explaining the operation of the mapping information determination device according to the second embodiment.

FIG. 5 is a block diagram showing a configuration of a mapping information determination device according to Embodiment 3 of the present invention.

FIG. 6 is a flowchart for explaining the operation of the mapping information determination device according to the third embodiment.

[Explanation of symbols]

 100, 300, 500 Mapping information judgment device 102 TFCI judgment unit 103 TFCI storage unit 104 Data decoding unit 301 SW judgment unit 501 CRC judgment unit

Claims (9)

[Claims] 1. A TFC indicating the contents of mapping information having different transmission rates mapped in a received radio frame.
First determining means for determining whether or not I is equal to a predetermined value; storage means for overwriting and storing the TFCI when the result of the determination indicates that the TFCI is equal to the specified value; As a result of the determination, if the TFCI is the same as the specified value, the mapping information is decoded according to the TFCI subject to the determination, and if different from the specified value, the mapping information is decoded according to the TFCI stored in the storage unit. And decoding means for decoding the mapping information. 2. A method according to claim 1, further comprising: a second determining unit that determines whether the wireless state is a synchronous state or an asynchronous state from a switch indicating a wireless synchronous / asynchronous state. 2. The mapping information determination device according to claim 1, wherein when it is determined that the TFCI is the same as a predetermined value. 3. A method according to claim 1, further comprising: a third determination unit configured to determine whether there is an error in the data based on the error detection code added to the data decoded by the decoding unit. 3. The mapping information determination device according to claim 1, wherein when there is no mapping information, the TFCI determined by the first determination unit to be the same as the specified value is overwritten and stored. 4. A mobile station device comprising the mapping information determination device according to claim 1. 5. A base station apparatus comprising the mapping information determination apparatus according to claim 1. 6. The mobile station apparatus according to claim 4, or claim 5.
A mobile communication system comprising the base station apparatus according to any one of the preceding claims. 7. A TFC indicating the contents of mapping information having different transmission rates mapped in a received radio frame.
I is determined whether or not I is equal to a predetermined value. If the result of the determination is that the TFCI is the same as the specified value, the TFCI is overwritten and stored.
If the FCI is different from the specified value, the stored TF
A mapping information determination method, wherein the mapping information is decoded according to a CI. 8. The radio communication apparatus according to claim 7, wherein a synchronous / asynchronous state of the radio is determined, and when the synchronous state is determined, it is determined whether or not the TFCI is equal to a predetermined value.
The described mapping information determination method. 9. The method according to claim 7, wherein it is determined whether or not there is an error in the decoded data, and when there is no error, the TFCI determined to be the same as the specified value is overwritten and stored. The method for determining mapping information according to claim 8.