JP3456197B2 - Transmission power storage control circuit and 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 transmission power storage control circuit and method, and more particularly to a CDMA (CodeDiv).
The present invention relates to a method of controlling transmission power of a mobile terminal in the "ion multiple access" method.

[0002]

2. Description of the Related Art Conventionally, in a CDMA system, when a signal level from a mobile terminal close to the base station is high on the uplink from the mobile terminal to the base station, it becomes impossible to receive signals from other mobile terminals. Therefore, it is necessary to control the transmission power of the mobile terminal so that signals are received at the same level from any mobile terminal.

In this case, the base station must control the transmission power of each mobile terminal so that the power of the received data from each mobile terminal becomes equal. The base station performs transmission power control in slot length units, and as its control, compares the received power from the mobile terminal with a predetermined reference power value, so that the received power matches the reference power value,
It controls the up and down of the transmission power to the mobile terminal.

At this time, the base station transmits TPC (Transmission Power) together with the downlink transmission data.
r Control) bit instructs the mobile terminal to increase or decrease the transmission power. Similarly, the mobile terminal also uses the TPC bit to request the base station to increase or decrease the transmission power.

Regarding the above-mentioned transmission power control timing, 3GPP (3rd Generality), which considers the third-generation W-CDMA (Wide CDMA) communication standard, is considered.
3G TS 25.214 {Technical, which is one of the onPartnership Projects)
Specification Group Radi
o Access Network Physical
Channels and mapping of t
transport channels (FDD)}.

According to this standard, when a TPC bit is received from a mobile terminal, the base station reflects the request (request for increasing or decreasing the transmission power) by the TPC bit in the transmission power of the downlink transmission data. Not from the beginning of the data slot, but from the position of the pilot (pilot) bit, which is one of the transmission data, to the next pil
It is just before the ot bit. That is, the base station raises or lowers the transmission power from the position of the pilot bit to the position before the next pilot bit.

Also, when the mobile terminal receives the TPC bit from the base station and reflects the instruction of the TPC bit in the uplink transmission data, the timing is the same as the above.
It consists of lot bits.

[0008]

In the above-mentioned conventional transmission power control method, the slot boundary of data is recognized in order to realize the above-mentioned function, and the TPC is started from the head of the pilot bit position in the slot for each slot. A bit reflects the result.

When performing transmission power control in slot units, it is necessary to separate the control by reflecting the result of the immediately preceding TPC bit and the result of the current TPC bit at the beginning of the pilot bit. However, the processing becomes complicated and the circuit configuration lacks versatility.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to control the transmission power value so that the result of the TPC bit can be easily reflected from the position of the pilot bit, and a transmission power storage control circuit thereof. To provide a method.

[0011]

In a transmission power storage control circuit according to the present invention, a base station and a mobile terminal receive a transmission power from their own device from a partner device by a TPC (Transmismi).
transmission power control control circuit according to the TPC bit received from the partner device, which is a transmission power storage control circuit for controlling the transmission power control bit from the position of the pilot bit which is one of the transmission data. Generating means for generating the transmission power value, storage means for storing the transmission power value generated by the generation means in correspondence with the content of the transmission data, preset transmission data rate to the partner device, and the pilot bit Means for calculating the storage position in the storage means of the transmission power value generated by the generation means, from the position and the number of pilot bits.

In the transmission power storage control method according to the present invention, the base station and the mobile terminal receive the transmission power from the own device from the partner device by a TPC (Transmission Pow).
erControl) bit, and a transmission power storage control method for performing the control from the position of the pilot bit which is one of the transmission data, the transmission power value being set according to the TPC bit received from the partner device. The step of generating, the transmission power value generated by the generating means from the speed of the transmission data to the partner device, the position of the pilot bit, and the number of bits of the pilot bit which are set in advance are set as the contents of the transmission data. And a step of calculating the storage position of the storage means for storing correspondingly.

That is, the transmission power storage control circuit of the present invention, when the base station receives the data transmitted as the uplink TPC bit from each mobile terminal, the transmission data rate of the downlink data to be transmitted to the mobile terminal in advance, the pilot. Recognize the bit position and the number of bits of the pilot bit
By identifying the position of the t bit, a circuit is realized which makes it easier to reflect the reception result of the uplink TPC bit from each mobile terminal as the transmission power value from the position of the pilot bit of the downlink transmission data as compared with the conventional case. .

Specifically, in the transmission power storage control circuit of the present invention, the transmission data rate of the data to be transmitted, pilo
Regardless of the position of the t bit, the transmission power value of the pilot bit is controlled by generating an address so as to be stored from the beginning of the storage area. In addition, the storage location has a two-sided structure so that when writing a new transmission power value, reading and writing of the transmission power value do not conflict with each other.

As described above, the downlink TPC bit reception result is preliminarily transmitted, and the downlink transmission data rate, the arbitrarily set pilot bit position of the downlink transmission data, and the arbitrarily set number of pilot bits are recognized. Then pi
By specifying the position of the lot bit, pilo can be easily
The transmission power value can be reflected from the t-bit position.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a transmission power storage control circuit according to an embodiment of the present invention. 1, a transmission power storage control circuit according to an embodiment of the present invention includes a reception radio unit 1, a data demodulation unit 2, a despreading unit 3, an upstream TPC bit extraction unit 4, and a downstream TPC.
The bit determination unit 5, the power value control unit 6, the transmission mode control unit 7, the transmission data encoding unit 8, the signal generation unit 9, the data diffusion unit 10, and the transmission radio unit 11 are included. .

Referring to FIG. 1, the operation of determining the power value of the transmission data to the mobile terminal by the uplink TPC bit from the mobile terminal (not shown) in one embodiment of the present invention will be described.

The data transmitted from the mobile terminal is filtered by the receiving radio section 1 to remove the out-of-band component, demodulated by the data demodulation section 2 and despread by the despreading section 3.

Downlink TPC for despread data
The bit determination unit 5 calculates the SIR (Signal) from the received power value.
to Interference power Ra
(tio: ratio of desired wave to interference wave power) is calculated, and the TPC bit to be transmitted to the mobile terminal is determined by the downlink transmission data. The determined TPC bit is transmitted to the signal generator 9 by T
It is inserted at the position where the PC bit is transmitted.

In addition, the despread data from the mobile terminal is output to the power value control unit 6 after the TPC bits are extracted by the upstream TPC bit extraction unit 4. Power value control unit 6
, The T input from the upstream TPC bit extraction unit 4
The transmission power value is determined based on the value of the PC bit, the position of the pilot (pilot) bit, the bit length of the pilot bit, the rate of the data to be transmitted is notified from the transmission mode control unit 7, and the transmission power value of the pilot bit is determined. But,
An address is generated and stored so as to be stored at the head position of the storage position of the power value corresponding to the pilot bit in the power storage area.

The transmission data is encoded by the transmission data encoder 8 and transmitted to the signal generator 9. The signal generation unit 9 forms a data frame to be transmitted at the transmission data rate notified from the transmission mode control unit 7, and the downlink TPC
TP the TPC bit generated by the bit decision unit 5
The C bit is inserted at a position where it should be inserted to form transmission data.

The timing of transmitting the formed transmission data to the data diffusion unit 10 in the signal generation unit 9 is controlled by the data offset value notified from the transmission mode control unit 7. The data diffusion unit 10 diffuses the formed data and outputs it to the transmission wireless unit 11. The transmission wireless unit 11 outputs transmission data according to the transmission power value output from the power value control unit 6.

FIG. 2 is a block diagram showing the configuration of the power value control unit 6 of FIG. In FIG. 2, the power value control unit 6 includes a power value generation unit 61, a power value storage address generation unit 62,
The power value storage address transmission unit 63, a data storage unit (memory) 64, an offset counter 65, a power value transmission unit 66, and a use surface display unit 67 are included.

FIG. 3 shows 3GPP 3G TS 25.21.
It is a figure which shows the data format described in 0. In FIG. 3, the data format forms a frame of 10 msec, and 15 slots (# 0 to # are included in the frame.
It is divided into 14). The number of data bits in the slot varies depending on each rate.

FIG. 4 is a diagram showing the data format when there is a pilot bit at the end of the slot, FIG. 5 is a diagram showing the data format when there is a pilot bit at the beginning of the slot, and FIG. 6 is a diagram showing the data format. It is a flow chart which shows operation of electric power value control part 6 of No. 1.

The operation of the transmission power storage control circuit according to the embodiment of the present invention will be described with reference to FIGS. Hereinafter, control of the power value when transmitting data to the mobile terminal at a speed of Sbps will be described.

The power value storage address generation unit 62 of the power value control unit 6 has a rate at which data is transmitted from the transmission mode control unit 7, a position of the pilot bit from the beginning, and a pilot.
Since the bit length is notified, the storage address of the power value is controlled based on these pieces of information. The control method depends on the position of the pilot bit, as in the following example.

For example, as shown in FIG. 3, the start position of the pilot bit is the "L" th bit from the beginning of the slot, the length of the pilot bit is "M" bits, and the transmission rate is Sbps (K bits / slot). When the power value of the data is stored at the beginning of the pilot bit storage area,
First, the power value storage address generation unit 62 determines whether or not L = 0 (step S1 in FIG. 6).

If L ≠ 0, the power value storage address generator 62 determines whether K = L + M (step S4 in FIG. 6). The power value storage address generation unit 62 uses K ≠ L + M
If so, the storage area currently used (whether the front side or the back side of the use side) is judged based on the information from the use side display section 67 (step S7 in FIG. 6), and if the back side is used. Then, a value shifted by K- (L + M) from the top address of the front surface is generated and serially sent to the power value storage address transmission unit 63 (step S8 in FIG. 6).

On the other hand, when the power value storage address generation unit 62 determines that the front side is being used based on the information from the use surface display unit 67, K- (L +
M) A shifted value is generated and serially sent to the power value storage address transmission unit 63 (step S8 in FIG. 6). The power value storage address transmission unit 63 serial-parallel converts the back or front address value, and transmits the converted address to the data storage unit 64 (step S in FIG. 6).
9).

On the other hand, the power value generation unit 61 generates a power value which is increased or decreased from the transmission power value one slot before by the upstream TPC bit from the mobile terminal extracted by the upstream TPC bit extraction unit 4, and the data storage unit. To 64. As a result, the transmission power value corresponding to the upstream TPC bit of the transmission data to be transmitted this time is stored at the beginning of the storage area of the pilot bit.

When the offset value of the data output timing is given from the transmission mode control unit 7, the offset counter 65 counts the offset value. The power value transmission unit 66 transmits the transmission power value stored in the data storage unit 64 to the transmission wireless unit 10 in accordance with the transmission data to be reflected, according to the count result of the offset counter 65.

Also, as shown in FIG. 4, when there is a pilot bit at the end of the slot, in the same manner as above,
The power value storage address generation unit 62 determines whether L = 0 (step S1 in FIG. 6), and if L ≠ 0, K = L + M
It is determined whether or not (step S4 in FIG. 6).

The power value storage address generation unit 62 uses K = L +
If it is M, the unused surface of the currently used storage area (front or back of the used surface) is determined based on the information from the used surface display section 67 (step S5 in FIG. 6), and the used surface is used. An address shifted from the head of the power value storage area by L is generated as an address for the surface that has not been processed, and is serially sent to the power value storage address transmission unit 63 (step S in FIG.
6).

The power value storage address transmitting unit 63 serial-parallel converts the back surface or front surface address value and transmits the converted address to the data storage unit 64 (step S9 in FIG. 6).

Further, as shown in FIG. 5, the pilot bit is at the beginning of the slot, the position of the beginning of the pilot bit: L = 0, the length of the pilot bit is "M", and the transmission rate is Sbps (K bits / When storing the power value of the data of the slot), the power value storage address generation unit 62
Determines whether L = 0 (step S1 in FIG. 6).

If L = 0, the power value storage address generation unit 62 does not use the storage area (front or back of the use surface) currently used based on the information from the use surface display unit 67. The surface is determined (step S2 in FIG. 6), the head address of the storage area of the unused surface is generated, and serially sent to the power value storage address transmission unit 63 (step S3 in FIG. 6). The power value storage address transmission unit 63 serial-parallel converts the back or front address value, and transmits the converted address to the data storage unit 64 (step S9 in FIG. 6).

As described above, by storing the power value determined by the upstream TPC bit from the beginning of the storage area of the power value stored corresponding to the pilot bit, the upstream TPC bit transmitted from the mobile terminal is stored. It becomes easy to control the transmission power with the generated power value.

That is, the reception result of the uplink TPC bit is recognized by recognizing the downlink transmission data rate to be transmitted in advance, the arbitrarily set pilot bit position of the downlink transmission data, and the arbitrarily set number of pilot bits.
Uplink TPC by specifying the position of the ot bit
The transmission power value can be controlled so that the bit result can be easily reflected from the position of the pilot bit.

In the above description, the control of the transmission power of the transmission data from the base station to the mobile terminal has been described, but the above control is also applied to the control of the transmission power of the transmission data from the mobile terminal to the base station. However, the present invention is not limited to this.

[0041]

As described above, according to the present invention, the base station and the mobile terminal control the transmission power from the own device according to the TPC bit received from the partner device, and the control is one of the transmission data. , The transmission power value is generated according to the TPC bit received from the partner device, and the speed of the transmission data to the partner device, the position of the pilot bit, and the number of pilot bits are set in advance. By calculating the storage position of the storage means for storing the transmission power value generated from and corresponding to the content of the transmission data, the result of the TPC bit can be easily pilled.
There is an effect that the transmission power value can be controlled so as to be reflected from the position of the ot bit.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a transmission power storage control circuit according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a power value control unit in FIG.

FIG. 3 is a diagram showing a data format described in 3G TS 25.210 of 3GPP.

FIG. 4 is a diagram showing a data format when there is a pilot bit at the end of a slot.

FIG. 5 is a diagram showing a data format when a pilot bit is at the beginning of a slot.

FIG. 6 is a flowchart showing the operation of the power value control unit in FIG.

[Explanation of symbols]

1 reception radio section 2 Data demodulator 3 despreader 4 Upstream TPC bit extractor 5 Downlink TPC bit decision unit 6 Power value control unit 7 Transmission mode control unit 8 Transmission data encoder 9 Signal generator 10 Data diffusion unit 11 Transmission radio section 61 Power value generator 62 Power value storage address generator 63 Power value storage address transmitter 64 data storage 65 offset counter 66 Power value transmitter 67 Display side

Claims (6)

(57) [Claims] 1. A TPC (Transmis) in which a base station and a mobile terminal receive transmission power from the own device from a partner device.
A transmission power storage control circuit for controlling the transmission power according to the TPC bit received from the partner device. Generating means for generating a value, storing means for storing the transmission power value generated by the generating means in correspondence with the content of the transmission data, preset speed of the transmission data to the partner device, and the pilot A transmission power storage control circuit, comprising means for calculating a storage position in the storage means of the transmission power value generated by the generation means, from a bit position and the number of pilot bits. 2. The means for calculating the storage position calculates the storage position so as to store the transmission power value generated by the generation means from the beginning of the storage area corresponding to the pilot bit in the storage means. The transmission power storage control circuit according to claim 1, wherein: 3. The storage means is configured such that the storage location is composed of two surfaces, a front surface and a back surface, and the reading and writing of the transmission power value do not conflict with each other when writing a new transmission power value. The transmission power storage control circuit according to claim 1 or 2, characterized in that. 4. The TPC (Transmis) in which the base station and the mobile terminal receive the transmission power from the own device from the other device.
transmission power control control method according to the TPC bit received from the other device, which is a transmission power storage control method for controlling the transmission power from the position of the pilot bit which is one of the transmission data. A step of generating a value, a storage position of storage means for storing the generated transmission power value in correspondence with the content of the transmission data, the speed of the transmission data to the partner device, which is preset, and the pilot bit And a step of calculating from the position and the number of bits of the pilot bit. 5. The step of calculating the storage position is such that the storage position is calculated so as to store the transmission power value generated by the generation means from the beginning of a storage area corresponding to the pilot bit in the storage means. The transmission power storage control method according to claim 4, wherein: 6. The storage means is configured such that the storage location is composed of two surfaces, a front surface and a back surface, and the reading and the writing of the transmission power value do not conflict with each other when writing a new transmission power value. 6. The transmission power storage control method according to claim 4 or claim 5.