Source: http://www.google.com/patents/US7174182?dq=Xerox+%2B+%22centroid
Timestamp: 2015-08-02 21:52:55
Document Index: 666650896

Matched Legal Cases: ['art 3', 'art 3', 'art 2', 'art 3', 'art 2', 'art 7', 'art 14', 'art 17', 'art 2', 'art 15', 'art 3', 'art 7', 'art 7']

Patent US7174182 - Transmitting electric power control method in the CDMA system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn electric power control method is provided. In the method, a range having a maximum value, which is an output ratio of initial target signal to disturbance wave added with an offset addition value, and a minimum value, which is the output ratio of initial target signal to disturbance wave subtracted...http://www.google.com/patents/US7174182?utm_source=gb-gplus-sharePatent US7174182 - Transmitting electric power control method in the CDMA systemAdvanced Patent SearchPublication numberUS7174182 B2Publication typeGrantApplication numberUS 10/419,871Publication dateFeb 6, 2007Filing dateApr 22, 2003Priority dateApr 23, 2002Fee statusPaidAlso published asCN1455537A, US20040038699Publication number10419871, 419871, US 7174182 B2, US 7174182B2, US-B2-7174182, US7174182 B2, US7174182B2InventorsKousuke ToonoOriginal AssigneeNec CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (16), Referenced by (1), Classifications (12), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetTransmitting electric power control method in the CDMA system
US 7174182 B2Abstract
An electric power control method is provided. In the method, a range having a maximum value, which is an output ratio of initial target signal to disturbance wave added with an offset addition value, and a minimum value, which is the output ratio of initial target signal to disturbance wave subtracted an offset subtraction value, is set. If an output ratio of target signal to disturbance wave is equal to or more than the maximum, the output ratio of target signal to disturbance wave is set to the maximum, if an output ratio of target signal to disturbance wave is equal to or less than the minimum, the output ratio of target signal to disturbance wave is set to the minimum, and if an output ratio of target signal to disturbance wave is within the range, no adjustment is performed.
a receiving circuit for receiving packet data;
an allowable range setting circuit for setting an allowable range of an output ratio of target signal to disturbance wave, the allowable range setting circuit setting maximum and minimum values of the allowable range based on the value of an output ratio of initial target signal to disturbance wave;
a packet data detecting circuit for detecting existence of packet data during receiving the packet data, wherein the packet data detecting circuit detects existence of packet data in a fixed cycle; and
a speed detecting circuit, wherein the allowable range setting circuit changes the allowable range according to a detecting result of the speed detecting circuit, wherein if the value of an output ratio is of initial target signal to disturbance wave is less that the minimum value of the allowable range, a target value of the output ratio of initial target signal to disturbance wave is set to the minimum value of the allowable range.
2. The mobile radio apparatus according to claim 1, wherein if the value of an output ratio of initial target signal to disturbance wave is more than the maximum value of the allowable range, a target value of the output ratio of initial target signal to disturbance wave is set to the maximum value of the allowable range.
3. A mobile radio apparatus, which executes transmitting electric power control, comprising:
a speed detecting circuit, wherein the fixed cycle is changed according to a detecting result of the speed detecting circuit, wherein if the value of an output ratio of initial target signal to disturbance wave is less that the minimum value of the allowable range, a target value of the output ratio of initial target signal to disturbance wave is set to the minimum value of the allowable range.
4. The mobile radio apparatus according to claim 3, wherein if the value of an output ratio of initial target signal to disturbance wave is more than the maximum value of the allowable range, a target value of the output ratio of initial target signal to disturbance wave is set to the maximum value of the allowable range.
5. A mobile radio apparatus, which executes transmitting electric power control, comprising:
allowable range setting circuit for setting an allowable range of an output ratio of target signal to disturbance wave, the allowable range setting circuit setting maximum and minimum values of the allowable range based on the value of an output ratio of initial target signal to disturbance wave;
packet data detecting circuit for detecting existence of packet data during receiving the packet data, wherein the packet data detecting circuit detects existence of packet data in a fixed cycle; and
speed detecting circuit, wherein the output ratio of initial target signal to disturbance wave, which is used as a reference, is added or subtracted with an adjustment value according to a detecting result of the speed detecting circuit wherein if the value of an output ratio of initial target signal to disturbance wave is less that the minimum value of the allowable range, a target value of the output ratio of initial target signal to disturbance wave is set to the minimum value of the allowable range.
6. The mobile radio apparatus according to claim 5, wherein if the value of an output ratio of initial target signal to disturbance wave is more than the maximum value of the allowable range, a target value of the output ratio of initial target signal to disturbance wave is set to the maximum value of the allowable range.
7. An electric power control method for a mobile radio apparatus, comprising:
an adjustment range setting step of setting an adjustment range of an output ratio of target signal to disturbance wave, the adjustment range setting step setting maximum and minimum values of the adjustment range based on the value of an output ratio of initial target signal to disturbance wave
a detecting step of detecting the output ratio of receiving signal to disturbance wave related to signals from the base station;
a determining step of determining whether the output ratio of receiving signal to disturbance wave is within the adjustment range if data is not included in signals from the base station;
a command step of issuing a command to allow the output ratio of receiving signal to disturbance wave to enter in the adjustment range if the determining step determines that the output ratio of receiving signal to disturbance wave is not within the adjustment range, wherein if the value of an output ratio of initial target signal to disturbance wave is less that the minimum value of the adjustment range, a target value of the output ratio of initial target signal to disturbance wave is set to the minimum value of the adjustment range; and
a speed detecting step of determining moving speed of a mobile radio apparatus, wherein an adjustment range is adjusted at the adjustment range setting step according to a decision of the speed detecting step.
8. The electric power control method according to claim 7, wherein if the value of an output ratio of initial target signal to disturbance wave is more than the maximum value of the adjustment range, a command, which sets a target value of the output ratio of initial target signal to disturbance wave to be the maximum value of the adjustment range, is issued at the command step.
In order to solve the near/far problem, transmitting electric power control to adjust transmitting electric power from mobile and base stations is indispensable. For example, in re-released patent WO97/50197, in order to reduce the output from a mobile station near to abase station, an electric power ratio of receiving signal to disturbance wave for a desired wave is measured at a base station, and an output ratio of target signal to disturbance wave(target SIR), which is acquired from a block error rate, is compared with the output ratio of receiving signal to disturbance wave(received SIR) to determine electric power increase or decrease. Then, a transmitting frame of signals from the base station to a mobile station, in which a transmitting electric power control bit is defined, is transmitted, enabling to increase or decrease electric power.
FIG. 1 is a block diagram to show a first embodiment of a mobile radio device according to this invention;
FIG. 2 is a block diagram to show a circuit structure related to electric power control in a base band part shown in FIG. 1;
FIG. 3 is a figure to show an operating situation of electric power control in a cellular phone device when an output ratio of target signal to disturbance wave becomes beyond a fixed value in the first embodiment related to the cellular phone device according to this invention;
FIG. 4 is a figure to show an operating situation of electric power control in a cellular phone device when an output ratio of target signal to disturbance wave becomes beyond a fixed value in the first embodiment related to the cellular phone device according to this invention;
FIG. 5 is a figure to show an operating situation of electric power control in a cellular phone device when an output ratio of target signal to disturbance wave is within a particular range in the first embodiment related to the cellular phone device according to this invention;
FIG. 6 is a figure to show a processing flow between the processor and the base band part in the first embodiment related to a cellular phone device according to this invention;
FIG. 7 is a block diagram to show an operating situation of electric power control in a cellular phone device when an output ratio of target signal to disturbance wave becomes beyond a fixed value in a second embodiment related to the cellular phone device according to this invention;
FIG. 8 is a figure to show a processing flow between the processor and the base band part in the second embodiment related to a cellular phone device according to this invention;
FIG. 9 is a figure to show an example of change of time until target SIR is adjusted in resource opening at a base station as a function of speed of a cellular phone device;
FIG. 10 is a figure to show an example of change of time until target SIR is adjusted in maintaining of a block error rate at a cellular phone device as a function of speed of a cellular phone device;
FIG. 11 is a figure to show an example of change of an offset addition value as a function of speed of a cellular phone device;
FIG. 12 is a figure to show an example of change of an offset subtraction value as a function of speed of a cellular phone device;
FIG. 13 is a figure to show an example of change of an un-changed section generated by offset addition and subtraction values depending on the changes shown in FIGS. 11 and 12; and
FIG. 14 is a figure to show change of an adjustment range as a function of speed in the case of that initial target SIR, which is referred in determining the adjustment range, is defined with an adjustment value that changes with the speed.
FIG. 1 is a block diagram to show a first embodiment of a mobile radio device according to this invention. Hereinafter, a CDMA cellular phone device, with which a CDMA system is employed, will be used as a mobile radio device.
The base band part 3 includes an encoder, which performs error correction encoding for data transmitted from the processor 4, a circuit, which divides into radio frames, and a circuit, which performs orthogonal code diffusion. In addition, the base band part 3 also includes a circuit, which performs orthogonal code reverse diffusion for received data demodulated at the radio part 2, a circuit, which measures power, a circuit, which multiplexes radio frames, and a decoder, which performs error correction decoding. Furthermore, the base band part 3 includes a circuit related to electric power control according to this invention. In this circuit, base station transmitting power control is performed by comparing an output ratio of receiving signal to disturbance wave (hereafter, called as receiving SIR), which is calculated by the processor 4 (described later) using the result of power measurement of received data, with an output ratio of target signal to disturbance wave (hereafter, called as target SIR), which is determined by the processor 4, generating a transmitting power control bit for the base station transmitting electric power control, and mapping it onto a physical cannel to transmit via the radio part 2.
The speed measurement part 7 checks speed of a cellular phone device itself. Although there is a method of preparing a speed measurement circuit or pseudly acquiring speed by measuring a Doppler effect at each path of each rake receiver, any method may be employed in this invention if speed can be measured.
FIG. 2 is a block diagram to show a basic structure of a circuit related to electric power control in the base band 3. A block error rate measurement part 14 in this figure, however, exists in the processor 4.
FIGS. 3 to 6 are figures to explain the first embodiment of this invention, and operations in the first embodiment will be explained with them.
FIG. 3 shows operations in the first embodiment of this invention in the case of that a state without any packets during a fixed period occurs depending on circuit situation at a server or other reasons. In this figure, horizontal and vertical axes express time, and target SIR (line graph) and received signal output (bar graph) respectively. The horizontal and vertical axes in FIGS. 4 and 5 are also the same as that of FIG. 3.
A CDMA cellular phone device in the first embodiment sets a dedicated channel to a base station (not shown) when calling or receiving. At beginning of communication, downlink electric power control is begun at the base station from an initial value or target SIR (initial target SIR). In FIG. 3, with operations of electric power control, the sate state after increasing the target SIR to a fixed value is shown.
In accordance with combining the inner loop 10 and the outer loop 12, the reason is following. If electric power control is performed by only the inner loop 10, which increases output if received SIR decreases below to a fixed value, all terminal devices which establish a dedicated channel to the same base station reaches the maximum value. It is caused by requests of all terminal devices because received SIR at other terminal devices becomes worsens by the request of output increase from one terminal device. The request of electric power control is transmitted from the transmitting electric power control command determination part 17 to a base station as a TPC command of an up dedicated channel (from a terminal device to the base station) via the radio part 2 to control downlink signal electric power.
FIG. 4 shows operations in the state that the current value of target SIR is less than the minimum of the adjustment range and a packet does not exist for a fixed time in the first embodiment of this invention. In this case, the processor 4 allows the target SIR setting part 15 to set target SIR to the minimum of the range (target SIR is increased), so that downlink transmitting electric power in the base station side is increased, enabling to prevent unexpected aggravation of BLER. In addition, the optimal value of the offset subtraction value should also be experientially acquired. Since the outer loop 12 is provided to make target SIR decrease, it is possible that the minimum of the adjustment range is not set and processing related to this figure is not performed if a designer determined that it is not desirable to make target SIR increase by employing this control.
FIG. 5 shows operations in the state that the current target SIR is, within the adjustment range and a packet does not exist for a fixed time in the first embodiment of this invention. In this case, in order to reduce change of receiving block error rate when a downlink packet data occurs, the processor 4 does not adjust target SIR.
As described above, a CDMA cellular phone device under packet data communications controls downlink transmitting electric power in the base station side, so that it is possible that available resources at a base station are increased if a downlink packet data does not exist and degradation of receiving block error rate is reduced when a downlink packet data occurs.
FIG. 6 illustrates an operation flow, which is an example of operations between the processor 4 of the CDMA cellular phone device shown in FIG. 1 in the first embodiment and the base band part 3.
In the third embodiment, FIG. 9 shows the change of a fixed time to a threshold of moving speed in the case of that resource opening of a base station is a chief aim. It is assumed that a phasing change on a transmission way is little in the state of a stop and the state of objects, such as a shelter, is not changed. A change of target SIR is defined as that of after 100 msec (the value of a fixed time in FIGS. 3 to 8) so that the current status can be maintained. Subsequently, movement is started by a vehicle, and the processor 4 defines fixed time as after 50 msec (a first value) if a moving speed measured by the speed measurement part 7 exceeds a first threshold (40Km/h in this figure). This prevents base station resources from being unnecessarily used although a block error rate becomes worse. Furthermore, if the moving speed exceeds a second threshold (more than 100Km/h in this figure) by riding on a highway and moving at a high speed, the processor 4 sets fixed time to after 10 msec and performs output adjustment of a base station early as much as possible to effectively use base station resources.
In the fourth embodiment, FIG. 10 shows the change of a threshold in the case of that, on the contrary, securing a block error rate in the terminal side is a chief aim. In the state of a stop, a block error rate is expected not to be decreased even if reducing some outputs, and the processor 4 sets fixed time to 10 msec. Subsequently, movement is started by a vehicle, and the processor 4 sets the fixed time to 50 msec to prevent the block error rate from decreasing by maintaining output if moving speed of a cellular phone device, which is measured by the speed measurement part 7, exceeds a first threshold (40Km/h in this figure). If the vehicle runs at higher speed and the moving speed of the cellular phone device exceeds a second threshold, the processor 4 sets the fixed time to 100 msec to maintain output and prevent the block error rate from decreasing.
In the state of a stop, an offset addition value is made the same as 3) an offset subtraction value (the value 5 in FIGS. 11 and 12), and the adjustment range is set at 10. If the moving speed of a cellular phone device exceeds 40Km/h and a first threshold, the offset addition value is changed to 10 in FIG. 11 and the offset subtraction value to 3 in FIG. 12. With this change, the width of the adjustment range itself shown in FIG. 13 becomes 13. This maintains a signal output value from a base station highly and extends the range in which output adjustment according to this invention is not performed. This is for the possibility of aggravation of a block error rate to arise if the possibility of environmental change on a transmission way increases and compulsory adjustment is performed against it. At the same time, even if receiving SIR is given to output adjustment according to this invention at or below a minimum value of the adjustment range, the minimum value of the adjustment range in this state is greater 2 than that in the state of a stop. Therefore, this allows the output to be increased to help improve BLER. Furthermore, if moving speed of a cellular phone device exceeds 100Km/h and a second threshold, the offset addition value in FIG. 11 and the offset subtraction value in FIG. 12 change to 15 and 1 respectively. As a result, the width of the adjustment range is extended to 16, and the range where output adjustment is not performed is increased. In addition, the minimum value of the adjustment range is increased, so that a signal output value from a base station can be highly maintained on the whole.
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