JP3508728B2 - Transmission power control method and base station apparatus using the same - 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 control method at the time of resource switching in a CDMA (code division multiple access) radio base station apparatus, and in particular, resource switching is possible with a transmission power value equal to that of the resource source. And a transmission power control method.

[0002]

2. Description of the Related Art In a CDMA radio base station apparatus, various transmission rates are required in order to respond to various service forms to each user, and it is required to allocate an optimum baseband resource corresponding to the transmission rate. Has been done.

On the other hand, on the other hand, it is also required to control the transmission power so as to minimize the interference with other users and keep the communication quality at the terminal high.

In the conventional transmission power control method during baseband resource switching, the resource destination is notified of the transmission power value of the resource source at a certain timing, holds the transmission power value until the resource switching timing, and holds it after the resource switching timing. The closed loop power control was performed based on the transmitted power value. Therefore, the transmission power value of the resource destination is
It depends on the transmission power value notified from the source and is different from the transmission power value of the resource source at the resource switching timing, so in some cases accompanied by an excessive increase or decrease of the transmission power value,
There was a problem that communication quality could not be maintained.

[0005]

In the conventional transmission power control method described above, when performing resource switching, the transmission power value inherited from the resource source and the transmission power value of the resource source at the resource switching timing are different. Therefore, there is a disadvantage that the communication quality cannot be maintained due to excessive increase or decrease of the transmission power value.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks by controlling the control CH whose resource destination is the same as that of the resource source.
By receiving the received symbol and receiving the transmission power value of the resource source when the resource destination starts the closed loop power control and obtaining the difference between the transmission power values of both sources and correcting it, the transmission power value of the resource source is equalized. It is to provide a transmission power control method capable of switching resources.

[0007]

A transmission power control method of the present invention is a transmission power control method at the time of resource switching in a CDMA (code division multiple access) radio base station apparatus, in which the resource destination is the same as the resource source. A correction value is calculated from the difference between the transmission power value when the CH reception symbol is received and the closed loop power control is started, and the transmission power value of the resource source when the closed loop power control is started, and by the time of resource switching. The transmission power value during the closed loop power control is controlled by the correction value so as to be equal to the resource source.

The transmission power control method of the present invention is a CD
A transmission power control method at the time of resource switching in an MA (code division multiple access) radio base station apparatus, in which a resource destination starts reception of the same control CH reception symbol as that of the resource source to establish synchronization to perform closed loop power control. The first transmission power value of the resource source notified before starting is stored and the closed loop power control is started as a transmission power initial value, and the second of the resource source when the closed loop power control is started is stored. The transmission power value is notified, a correction value is calculated from the difference between the first transmission power value and the second transmission power value, and the closed loop power control is being performed so as to be equal to the resource source by the time of resource switching. It is characterized in that control is performed to add the correction value to the transmission power value.

The base station apparatus of the present invention is a CDMA system.
(Code division multiple access) A wireless base station device, comprising a control C
The reception selection unit that supplies the H reception symbols to the plurality of resource units, the transmission selection unit that selects the control CH transmission symbols received from the plurality of resource units, the control CH reception symbols and the resource switching control unit Resource allocation and switching are performed based on a resource switching request from the outside with the plurality of resource units that perform closed loop power control by a control signal, and transmission and reception of transmission power values between the resource units and timing setting control are performed. It is characterized by comprising a resource switching control unit.

Further, the resource section uses a synchronization establishment determining section for determining synchronization establishment using the control CH reception symbol and a reception TPC (Tran (Trans) for the control CH reception symbol).
A TPC determination unit that issues an instruction to increase or decrease the transmission power value to the transmission power value setting unit based on a transmission power value), a transmission power value setting unit that performs the closed loop power control, and a transition of the transmission power value are stored. A transmission power value profile unit, a timing setting unit that sets the timing of passing the transmission power value between the resource units with the resource switching control unit, and a transmission power initial value for the transmission power value setting unit. Of the power value offset calculation unit for calculating the setting or power value offset, and the control C according to the signal output from the transmission power value setting unit.
A transmission unit that outputs the H transmission symbol to the transmission selection unit;
It is characterized by being composed of.

Further, the resource switching control unit allocates a plurality of the resource units as a resource source or a resource destination, and when the resource switching request from the outside is accepted, the control CH reception symbol is sent to the reception selecting unit. To the resource destination, receives the first transmission power value at the first timing set for the resource source, and starts the closed-loop power control for the resource destination. Notify as
Second, where the resource destination starts the closed loop power control
Is received and notified to the resource source, the second transmission power value of the resource source at the second timing is passed to the resource destination, the fourth timing of resource switching is set, and the reception selecting unit is set. , The transmission selection unit and the plurality of resource units are notified, and control is performed to release the resource source after executing resource switching.

Further, the resource unit serving as the resource source notifies the resource switching control unit of the first transmission power value at the set first timing, and the notified second transmission power value. The second transmission power value at the timing is notified.

Further, the resource part, which is the resource destination, receives the control CH reception symbol from the reception selecting part to establish a line, and instructs the resource switching control part to perform the closed loop based on the reception TPC bit. The second timing for starting power control is notified, the closed loop power control is started using the first transmission power value as a transmission power initial value, and the notified second transmission power value and the first A correction value is calculated from the difference with the transmission power value, and the correction value is added to the transmission power value during the closed loop power control at the third timing so as to be equal to the resource source before the fourth timing of resource switching. The feature is that the control is performed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the transmission power control method of the present invention.

In the present embodiment shown in FIG. 1, a reception selection section 10 for supplying control CH reception symbols to a plurality of baseband resource sections 30 and a plurality of baseband resource sections 3 are provided.
A transmission selection unit 20 that selects control CH transmission symbols received from 0, a plurality of baseband resource units 30 that performs closed-loop power control based on control CH reception symbols and a control signal notified from the resource switching control unit 40, and externally. The resource switching control unit 40 allocates and switches resources based on the resource switching request, and transmits and receives the transmission power value between the baseband resource units 30 and controls the timing setting.

Further, the baseband resource unit 30 shows a baseband resource unit 30a corresponding to a resource source and a baseband resource unit 30b corresponding to a resource destination for the sake of simplicity.

The baseband resource units 30a and 30b have the same configuration and the same function, and the synchronization establishment determining units 31a and 31b for determining synchronization establishment using the control CH reception symbol supplied from the reception selecting unit 10 and the control CH. Reception TPC (Transmission Po of received symbol)
The TPC determination units 32a and 32b that issue a command to increase or decrease the transmission power value to the transmission power value setting units 33a and 33b based on the (Wer Control) bit, the transmission power value setting units 33a and 33b that perform closed loop power control, and the transmission power. Transmission power value profile sections 34a, 34b for storing the transition of values
And the timing setting units 35a and 35b for setting the timing of passing the transmission power value between the baseband resource units 30 with the resource switching control unit 40, and the transmission power initial values for the transmission power value setting units 33a and 33b. Power value offset calculation units 36a and 36b for setting values or calculating power offsets, and transmission units 37a and 37b for outputting control CH transmission symbols to the transmission selection unit 20 according to signals output from the transmission power value setting units 33a and 33b. It is composed of

Next, the operation of the transmission power control method of the present embodiment will be described in detail with reference to FIG.

In FIG. 1, the following description will be made assuming that the resource source is the baseband resource unit 30a and the resource destination is the baseband resource unit 30b.

The reception selection section 10 supplies control CH reception symbols to the baseband resource section 30a which is the resource source.

The synchronization establishment determining unit 31a of the baseband resource unit 30a receives the control C received from the reception selecting unit 10.
The H reception symbol is used to determine synchronization establishment.

The TPC judging section 32a judges whether or not to increase the transmission power based on the received TPC bit of the control CH reception symbol, and issues a command for increasing or decreasing the transmission power value to the transmission power value setting section 33a. .

The transmission power value setting unit 33a performs closed loop power control.

The transmission power value profile section 34a stores the transition of the transmission power value.

The timing setting unit 35a sets a timing for transferring the transmission power value with the baseband resource unit 30b with the resource switching control unit 40.

The power value offset calculation unit 36a calculates the transmission power initial value setting and the power value offset for the transmission power value setting unit 33a.

The transmitting unit 37a includes a transmission power value setting unit 33a.
The control CH transmission symbol is output to transmission selection section 20 in accordance with the signal output from.

The resource switching control unit 40 allocates a plurality of baseband resource units 30a and 30b to a resource source or a resource destination, and when a baseband resource switching request input from the outside is accepted, the resource switching control unit 40b Transmission / reception, timing setting, and baseband resource switching are controlled by the following procedure.

Upon receiving the baseband resource switching request, the resource switching control unit 40 first receives the reception selecting unit 10.
To the resource destination and notifies the resource destination to receive the control CH received symbol. Next, an arbitrary timing T1 is set for the resource source, the transmission power value P1 at the timing T1 is received, and the resource destination is notified as the transmission power initial value for starting the closed loop power control.
Subsequently, the resource destination receives the timing T2 at which the closed loop power control is started and notifies the resource source, receives the transmission power value P2 at the timing T2, and notifies the return resource destination.

From this, the resource destination calculates the correction value from the difference between the transmission power value P1 when the closed loop power control is started and the transmission power value P2 of the resource source at the timing T2 when the closed loop power control is started. At timing T3 after timing T2, the correction value is added to the transmission power value during the closed loop power control so as to be equal to the transmission power value of the resource source.

Next, the resource switching control unit 40 sets the baseband resource switching timing T4, notifies the reception selection unit 10, the transmission selection unit 20, and the baseband resource units 30a and 30b of the baseband resource switching timing. After executing, the resource source is controlled to be released.

The transmission selector 20 selects the control CH transmission symbol received from the resource destination.

Next, the flow of the baseband resource switching operation of this embodiment will be described with reference to FIGS. 1 and 2. FIG. 2 is a timing chart showing an operating state of the transmission power value profile unit shown in FIG.

In FIG. 2, the transmission selection section 20 selects and transmits the output of the baseband resource section 30a which is the resource source for performing the closed loop transmission power control based on the reception TPC bit received from the reception selection section 10. To be in a state of being Further, the amount of increase or decrease in the power value of the closed loop power control based on the received TPC bit is ΔPtpc.

First, when the resource switching control unit 40 receives a baseband resource switching request from the outside, the resource switching control unit 40 causes the reception selecting unit 10 to transfer the control channel reception symbol to the baseband resource unit 30b which is the resource destination. At the same time, the resource destination is notified to receive the control CH reception symbol.

Next, the resource switching control section 40 sets an arbitrary timing T1 in the resource source timing setting section 35a, and receives the transmission power value P1 at the timing T1 from the transmission power value profile section 34a. Subsequently, the transmission power value P1 received from the resource source is notified to the transmission power value setting unit 33b at the resource destination to set it as the initial value of the transmission power control.

Therefore, T1 is the timing for acquiring the transmission power value P1 from the resource source as the transmission power initial value when the resource destination starts the transmission power control. Further, in ΔT1, the resource destination is the transmission power value setting unit 33b.
Is the delay amount until the transmission power initial value P1 is set.

Next, the resource destination is the synchronization establishment determination unit 31.
The timing T at which synchronization is established at b and the TPC determination unit 32b and the transmission power value setting unit 33b start closed loop power control.
2 is set and the resource switching control unit 40 is notified.

The resource switching control section 40 notifies the timing setting section 35a of the resource source of the timing T2 for starting the closed loop power control received from the timing setting section 35b of the resource destination, and the transmission power value profile section 34.
The transmission power value P2 at the timing T2 is received from a.

Therefore, T2 is the timing at which the resource destination starts the closed loop power control, and the transmission power initial value at this time is the transmission power P1 at the time point T1 acquired from the resource source. However, even if the resource destination starts the closed loop power control, the transmission selection unit 20 does not change the source transmission unit 37.
The output is still being selected and transmitted.

Next, the resource switching control section 40 notifies the transmission power value P2 received from the resource source to the power value offset calculation section 36b at the resource destination.

Power value offset calculation unit 36 at resource destination
b is a correction value ΔP21 based on the difference between the transmission power initial value P1 set at the timing T2 at which the closed loop power control is started and the transmission power value P2 at the source at the timing T2 at which the closed loop power control is started this time. = P2-
P1 is calculated and set in the transmission power value setting unit 33b as a power value offset. Next, the resource destination is the correction value Δ
The transmission power value during the closed loop power control is corrected at the timing T3 based on P21 and the power value increase / decrease amount ΔPtpc of the received TPC bit.

Therefore, at T3, the offset power ΔP21 and the power increase / decrease amount ΔPt of the received TPC bit are added to the transmission power value immediately before T3 when the resource destination is performing closed loop power control.
It is the timing to add the transmission power value added with pc, and at this point, the transmission power value of the resource destination can be matched with the transmission power value of the resource source. This process is shown by a solid line showing the transmission power value of the resource destination and a dotted line showing the transmission power value of the resource source in the section from the timing T2 to the timing T3, as shown in FIG.

Further, ΔT2 receives back the transmission power value P2 of the resource source at the time T2 notified by the resource destination to the resource source, and ΔP is received by the power value offset calculation unit 36b.
21 = P2-P1 is calculated and is the delay amount up to the timing T3 set by the transmission power value setting unit 33b.

Next, the resource switching control unit 40 sets the time point T4 for switching the baseband resource, and switches to the reception selection unit 10, the transmission selection unit 20, and the baseband resource units 30a and 30b of the resource source and the resource destination, respectively. The timing T4 is notified. Then, at the baseband resource switching timing T4, the reception selection unit 10 and the transmission selection unit 20 switch the connection destination from the resource source to the resource destination, and release the resource source, whereby the switching of the baseband resources ends.

As described above, after the timing T2 at which the resource destination starts the closed loop power control, the same transmission TPC bit is used at the resource source and the resource destination, so that the respective transmission power values transit equally and the resource at the time T2. A correction value, that is, an offset amount ΔP21 = P2-P1 is obtained from the difference between the transmission power values of the destination and the resource source, and the transmission of the resource destination during closed-loop power control is performed at any timing T3 up to the baseband resource switching timing T4. Since the power value is corrected, the resource destination can start transmission at the same transmission power value P4 as the resource source transmission power value P4 at the baseband resource switching timing T4.

As described above, according to the present embodiment, when performing resource switching, the transmission power value inherited from the resource source and the transmission power value of the resource source at the resource switching timing are different, so It is possible to eliminate the problem that the communication quality deteriorates due to the excessive increase and decrease of the value.

Further, the present embodiment is not limited to transmission power control at the time of switching baseband resources,
Further, the present invention can be applied to all wireless devices that require closed loop power control.

[0049]

As described above, according to the transmission power control method of the present invention, when the resource destination receives the same control CH received symbol as the resource source and the resource destination starts the closed loop power control, The difference between the transmission power values of the resource source and the resource source is calculated, and the transmission power value of the resource destination is corrected, so that at the time of switching, the resource destination can start transmission at the optimum transmission power value like the resource source. The effect is that you can do it.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a transmission power control method of the present invention.

FIG. 2 is a timing chart showing an operation state of a transmission power value profile section shown in FIG.

[Explanation of symbols]

10 Reception selection section 20 Transmission selection section 30a, 30b baseband resource section 40 resource switching control unit 31a, 31b Synchronization establishment determination unit 32a, 32b TPC determination unit 33a, 33b Transmission power value setting unit 34a, 34b Transmission power value profile section 35a, 35b Timing setting section 36a, 36b Power value offset calculator

Claims (7)

(57) [Claims] 1. A transmission power control method at the time of resource switching in a CDMA (code division multiple access) radio base station apparatus, in which a resource destination receives the same control CH reception symbol as the resource source and starts closed loop power control. A correction value is calculated from the difference between the transmission power value when and the transmission power value of the resource source when the closed loop power control is started, and the closed loop power control is being performed so as to be equal to the resource source by the time of resource switching. A transmission power control method, wherein a transmission power value is controlled by the correction value. 2. A transmission power control method at the time of resource switching in a CDMA (code division multiple access) radio base station apparatus, wherein a resource destination starts reception of the same control CH reception symbol as the resource source to establish synchronization. The resource at the time of starting the closed loop power control, storing the first transmission power value of the resource source notified before starting the closed loop power control and starting the closed loop power control as a transmission power initial value The original second transmission power value is notified, a correction value is calculated from the difference between the first transmission power value and the second transmission power value, and the correction value is calculated to be equal to the resource source by the time of resource switching. A transmission power control method comprising performing control to add the correction value to a transmission power value during closed loop power control. 3. A CDMA (code division multiple access) radio base station apparatus, comprising: a reception selection section for supplying control CH reception symbols to a plurality of resource sections; and a control CH transmission symbol received from the plurality of resource sections. A transmission selection unit to select, the plurality of resource units that perform closed-loop power control by the control CH received symbol and the control signal notified from the resource switching control unit, and resource allocation and switching based on a resource switching request from the outside. And a resource switching control unit for performing transmission and reception of a transmission power value between the resource units and controlling timing setting. 4. The resource section includes a synchronization establishment determining section that determines synchronization establishment using the control CH reception symbol,
Reception TPC (Transm of the control CH reception symbol)
A TPC determination unit that issues a command to increase or decrease the transmission power value to the transmission power value setting unit based on the issue power control bit, a transmission power value setting unit that performs the closed loop power control, and a transition of the transmission power value are stored. A transmission power value profile unit, a timing setting unit that sets the timing of passing the transmission power value between the resource units with the resource switching control unit, and a transmission power initial value for the transmission power value setting unit. Or a power value offset calculation unit that calculates a power value offset, and a transmission unit that outputs a control CH transmission symbol to the transmission selection unit according to a signal output from the transmission power value setting unit. The base station apparatus according to claim 3, wherein the base station apparatus is a base station apparatus. 5. The resource switching control unit allocates a plurality of the resource units as a resource source or a resource destination, and when the resource switching request from the outside is accepted, the control CH reception symbol is sent to the reception selecting unit. To the resource destination, receives the first transmission power value at the first timing set for the resource source, and starts the closed-loop power control for the resource destination. And notifies the resource source of the second timing at which the resource destination starts the closed-loop power control, and notifies the resource source of the second transmission power value of the resource source at the second timing. Fourth of handing over and switching resources
5. The timing is set to notify the reception selection unit, the transmission selection unit, and the plurality of resource units, and control is performed to release the resource source after executing resource switching. The described base station device. 6. The resource unit serving as the resource source notifies the resource switching control unit of the first transmission power value at the set first timing, and the notified second transmission power value. The second at the timing of
5. The transmission power value of the device is notified.
Alternatively, the base station device according to item 5. 7. The resource unit, which is the resource destination, receives the control CH reception symbol from the reception selection unit to establish a line, and provides the resource switching control unit with the closed loop based on the reception TPC bit. The second timing for starting the power control is notified, and the first timing is notified.
The closed loop power control is started with the transmission power value of 1 as the transmission power initial value, a correction value is calculated from the difference between the notified second transmission power value and the first transmission power value, and the resource switching is performed. The control for adding the correction value to the transmission power value during the closed loop power control is performed at a third timing so as to be equal to the resource source before the fourth timing. 6. The base station device according to item 6.