Source: http://www.google.com/patents/US7167718?ie=ISO-8859-1&dq=5,758,352
Timestamp: 2014-12-22 19:56:55
Document Index: 86781064

Matched Legal Cases: ['arts 31', 'arts 32', 'art 31', 'art 33', 'art 34', 'arts 1101', 'arts 1102', 'art 1101', 'art 1201', 'art 1206', 'art 1207', 'art 1201', 'art 1202', 'art 1203', 'art 1201', 'art 1204', 'art 1205', 'art 1208']

Patent US7167718 - Transmission power control apparatus, transmission power control method, and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA transmission power control apparatus for a wireless communication apparatus which reduces a power value of a signal input to a power amplifier to the maximum allowable input power value of the power amplifier or below is provided in which the transmission power control apparatus includes: a part for...http://www.google.com/patents/US7167718?utm_source=gb-gplus-sharePatent US7167718 - Transmission power control apparatus, transmission power control method, and mobile stationAdvanced Patent SearchPublication numberUS7167718 B2Publication typeGrantApplication numberUS 10/050,861Publication dateJan 23, 2007Filing dateJan 18, 2002Priority dateJan 18, 2001Fee statusPaidAlso published asCN1366391A, CN100459472C, DE60238732D1, EP1239602A2, EP1239602A3, EP1239602B1, US20020094835Publication number050861, 10050861, US 7167718 B2, US 7167718B2, US-B2-7167718, US7167718 B2, US7167718B2InventorsTakahiro Hayashi, Yoshihiro Ishikawa, Seizo Onoe, Takehiro Nakamura, Mikio Iwamura, Yoshiaki OfujiOriginal AssigneeNtt Docomo, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (13), Non-Patent Citations (2), Referenced by (7), Classifications (22), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetTransmission power control apparatus, transmission power control method, and mobile stationUS 7167718 B2Abstract A transmission power control apparatus for a wireless communication apparatus which reduces a power value of a signal input to a power amplifier to the maximum allowable input power value of the power amplifier or below is provided in which the transmission power control apparatus includes: a part for setting a transmission power upper limit value of a call according to a circuit type of the call; and a part for reducing transmission power for the call to the transmission power upper limit value or below.
1. A transmission power control apparatus for a wireless communication apparatus for reducing a power value of a signal input to a power amplifier to the maximum allowable, input power value of said power amplifier or below, said transmission power control apparatus comprising:
a setting part for setting a transmission power upper limit value of a call according to a circuit type of said call, wherein the circuit type includes a packet switching type and a circuit switching type, said transmission power upper limit value comprising a first transmission power upper limit value and a second transmission power upper limit value, wherein the first transmission power upper limit value corresponds to the packet switching type call and the second transmission power upper limit value corresponds to the circuit switching type call, wherein the first transmission power upper limit value is lower than the second transmission power upper limit value; and
a power reducing part for reducing transmission power for said call to or below said transmission power upper limit value depending on said call type,
wherein, said setting part reduces said first upper limit value by a first predetermined ratio when said over-input to said power amplifier occurs, and said setting part increases said first upper limit value by a second predetermined ratio which is lower than said first predetermined ratio when said over-input to said power amplifier does not occur.
2. The transmission power control apparatus as claimed in claim 1, wherein said setting part sets said first transmission power upper limit value according to a degree of delay and a degree of bit-error rate (BER) which can be allowed for said circuit switching type.
3. The transmission power control apparatus as claimed in claim 1, wherein said setting part monitors occurrence of over-input to said power amplifier, and sets another transmission power upper limit value when said over-input occurs.
4. The transmission power control apparatus as claimed in claim 1, wherein said setting part monitors occurrence of call loss, and sets another transmission power upper limit value when said call loss occurs.
5. The transmission power control apparatus as claimed in claim 1, wherein said transmission power control apparatus is provided in a base station of a wireless communication system.
6. The transmission power control apparatus as claimed in claim 1, wherein said setting part adaptively sets said second transmission power upper limit value according to a degree of delay and a degree of bit-error rate (BER).
7. The transmission power control apparatus as claimed in claim 1, wherein said setting part sets said second transmission power upper limit value according to a degree of delay and a degree of bit-error rate (BER) which can be allowed for said packet switching type.
8. A transmission power control apparatus for a wireless communication apparatus for reducing a power value of a signal input to a power amplifier to the maximum allowable input power value of said power amplifier or below, said transmission power control apparatus comprising:
a SIR determining part for determining a control target SIR value of a call according to a circuit type of said call, wherein the circuit type includes a packet switching type and a circuit switching type, said control target SIR value comprising a first control target SIR value and a second control target SIR value, said first and second control target SIR values corresponding to said circuit type;
a target SIR setting part for setting a first control target SIR value for a packet switching type call and a second control target SIR for a circuit switching type call, wherein the first control target SIR value is lower than the second control target value; and
a target SIR sending part for sending the first control target SIR value and a second control target SIR value to a communication station,
wherein, said SIR determining part reduces said first control target SIR by a first predetermined ratio when over-input to said power amplifier occurs, and said SIR detennining part increases said first control target SIR by a second predetermined ratio which is lower than said first predetermined ratio when said over-input to said power amplifier does not occur.
9. The transmission power control apparatus as claimed in claim 8, wherein said SIR determining part sets said first control target SIR according to a degree of delay, and a degree of bit-error rate (BER) which can be allowed for said circuit switching type.
10. The transmission power control apparatus as claimed in claim 8, wherein said SIR determining part monitors occurrence of over-input to said power amplifier, and sets another control target SIR when said over-input occurs.
11. The transmission power control apparatus as claimed in claim 8, wherein said SIR determining part monitors occurrence of over-input to said power amplifier, and sets another control target SIR when said over-input occurs.
12. The transmission power control apparatus as claimed in claim 8, wherein said SIR determining part monitors occurrence of call loss, and sets another control target SIR when said call loss occurs.
13. The transmission power control apparatus as claimed in claim 8, wherein said transmission power control apparatus is provided in a base station of a wireless communication system.
14. A mobile station for communicating with a base station, said base station comprising:
wherein, said SIR determining part reduces said first control target SIR by a first predetermined ratio when over-input to said power amplifier occurs, and said SIR determining part increases said first control target SIR by a second predetermined ratio which is lower than said first predetermined ratio when said over-input to said power amplifier does not occur.
15. A transmission power control method used for a wireless communication apparatus for reducing a power value of a signal input to a power amplifier to the maximum allowable input power value of said power amplifier or below, said transmission power control method comprising the steps of:
setting a transmission power upper limit value of a call according to a circuit type of said call, wherein the circuit type includes a packet switching type and a circuit switching type, said transmission power upper limit value comprising a first transmission power upper limit value and a second transmission power upper limit value, wherein the first transmission power upper limit value corresponds to the packet switching type call and the second transmission power upper limit value corresponds to the circuit switching type call, wherein the first transmission power upper limit value is lower than the second transmission power upper limit value; and
reducing transmission power for said call to or below said transmission power upper limit value depending on said call type,
reducing said first upper limit value by a first predetermined ratio when over-input to said power amplifier occurs;
16. The transmission power control method as claimed in claim 15, wherein said first transmission power upper limit value is set according to a degree of delay and a degree of bit-error rate (BER) which can be allowed for said circuit switching type.
17. The transmission power control method as claimed in claim 15, wherein another transmission power upper limit value is set when said over-input to said power amplifier occurs.
18. The transmission power control method as claimed in claim 15, wherein another transmission power upper limit value is set when over-input to said power amplifier occurs.
19. The transmission power control method as claimed in claim 15, wherein another transmission power upper limit value is set when call loss occurs.
20. The transmission power control method as claimed in claim 15, wherein said second transmission power upper limit value is set according to a degree of delay which can be allowed for said packet switching type.
21. A transmission power control method used for a wireless communication apparatus for reducing a power value of a signal input to a power amplifier to the maximum allowable input power value of said power amplifier or below, said transmission power control method comprising the steps of:
determining a control target SIR value of a call according to a circuit type of said call, wherein the circuit type includes a packet switching type and a circuit switching type, said control target SIR value comprising a first control target SIR value and a second control target SIR value, said first and second control target SIR values corresponding to said circuit type;
setting a first control target SIR value for a packet switching type call and a second control target SIR for a circuit switching type call, wherein the first control target SIR value is lower than the second control target value; and
sending the first control target SIR value and a second control target SIR value to a communication station,
reducing said first control target SIR by a first predetermined ratio when over-input to said power amplifier occurs;
22. The transmission power control method as claimed in claim 21, wherein said first control target SIR is set according to a degree of delay and a degree of bit-error rate (BER) which can be allowed for said circuit switching type.
23. The transmission power control method as claimed in claim 22, wherein another control target SIR is set when over-input to said power amplifier occurs.
24. The transmission power control method as claimed in claim 21, wherein another control target SIR is set when over-input to said power amplifier occurs.
25. The transmission power control method as claimed in claim 21, wherein another control target SIR is set when call loss occurs.
26. The transmission power control method as claimed in claim 21, wherein said second control target SIR is set according to a degree of delay and a degree of bit-error rate (BER) which can be allowed for said packet switching type.
27. A transmission power control apparatus for a wireless communication apparatus for reducing a power value of a signal of calls input to a power amplifier to the maximum allowable input power value of said power amplifier or below, said transmission power control apparatus comprising:
a classifying part for classifying calls into a circuit switching type group and a packet switching type group;
a power setting part for setting a first transmission power upper limit value of said circuit switching type group and a second transmission power upper limit value of said packet switching type group, wherein the second transmission power upper limit value is lower than the first transmission power upper limit value; and
a power reducing part operable to reduce a power value individually for each group such that a power value of said calls is equal to or below the maximum allowable input value of said power amplifier,
wherein said classifying part assigns priority for each call such that the larger a degree of delay which is allowed by said call is, the lower said priority is, and,
28. The transmission power control apparatus as claimed in claim 27, wherein said classifying part classifies said calls according to degree of delay and degree of bit-error rate (BER) which is allowed by a circuit type of each call.
29. The transmission power control apparatus as claimed in claim 27, wherein said power reducing part reduces only a power value of a group of said packet switching type.
30. The transmission power control apparatus as claimed in claim 27, wherein the number of said plurality of groups and said upper limit value for each group are changed according to types of said calls.
31. The transmission power control apparatus as claimed in claim 27, wherein said classifying part assigns priority for each call according to circuit characteristics of said each call, and said power reducing part reduces a power value of a call according to said priority.
32. The transmission power control apparatus as claimed in claim 27, wherein said power reducing part does not reduce a power value of a call which has priority within predetermined levels from the highest priority.
33. A transmission power control method used for a wireless communication apparatus for reducing a power value of a signal of calls input to a power amplifier to the maximum allowable input power value of said power amplifier or below, said transmission power control method comprising the steps of:
classifying calls into a circuit switching type group and a packet switching type group;
setting a first transmission power upper limit value of said circuit switching type group and a second transmission power upper limit value of said packet switching type group, wherein the second transmission power upper limit value is lower than the first transmission power upper limit value; and
reducing a power value individually for each group such that a power value of said calls is equal to or below the maximum allowable input value of said power amplifier,
assigning priority for each call such that the larger a degree of delay which is allowed by said call is, the lower said priority is; and
reducing each power value of a part of calls in ascending order of said priority such that a power value of calls input to said power amplifier is equal to or below the maximum allowable input power value to said power amplifier.
34. The transmission power control method as claimed in claim 33, wherein said calls are classified according to degree of delay and a degree of bit-error rate (BER) which is allowed by a circuit type of each call.
35. The transmission power control method as claimed in claim 33, wherein only a power value of a group of said packet switching type is reduced.
36. The transmission power control method as claimed in claim 33, wherein the number of said plurality of groups and said upper limit value for each group are changed according to types of said calls.
37. The transmission power control method as claimed in claim 33, comprising the steps of:
38. The transmission power control method as claimed in claim 33, wherein a power value of a call which has priority within predetermined levels from the highest priority is not reduced.
39. The transmission power control method as claimed in claim 37, comprising the steps of:
This reducing control will be described with reference to FIGS. 4A�4C. In this example, four calls (calls 1�4) are connected in which call 1 and call 2 are circuit switching type calls, and call 3 and call 4 are packet switching type calls, and the upper limit value of each call is 5. When transmission power of each call changes while being controlled by the upper limit value as shown in FIG. 4A, the total sum of the transmission power of the calls is as shown in FIG. 4B.
In the following, the problem will be described in detail with reference to FIGS. 5�7.
FIG. 5 is a block diagram showing only components relating to the present invention in a conventional transmission power control apparatus 600. In this case, the transmission power control apparatus is included in the base station. The transmission power control apparatus 30 includes a plurality of (for example N) baseband signal processing parts 31, transmission power control parts 32 each provided after the baseband signal processing part 31, a baseband signal multiplexing part 33 for multiplexing baseband transmission signals of each call, an over-input control part 34 which is a limiter for example, a power amplifier 35 and an antenna 36.
Next, the above-mentioned power reducing will be described with reference to FIGS. 6 and 7. FIG. 6 shows a schematic graph for a case when transmission power reducing is not performed for transmission power of the base station. FIG. 7 shows a schematic graph for a case when the transmission power reducing is performed by the conventional apparatus. In this example, signals are transmitted for calls 1�5, and the maximum allowable transmission power of the base station is 10 on the vertical axis of the graph. Then, it can be recognized that the transmission power exceeds the maximum allowable value at times 2, 3 and 6.
SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission power control apparatus and a transmission power control method for preventing deterioration of communication quality when reduction of transmission power is necessary for avoiding over-input to the power amplifier.
That the over-input occurs even when the upper limit value is set for each call means that the upper limit value is still high. Thus, in such a case, the upper limit value for the calls of the packet switching type is lowered such that communication quality of calls of the circuit switching type is not lowered.
That the over-input occurs even when the control target SIR is set for each call means that the control target SIR is still high. Thus, in such a case, the control target SIR for the calls of the packet switching type is lowered such that communication quality of calls of the circuit switching type is not lowered.
That the call loss occurs even when the control target SIR is set for each call means that power reduction occurs so that communication quality deteriorates. Thus, in such a case, the control target SIR for the calls of the packet switching type is lowered such that communication quality of calls of the circuit switching type is not lowered.
In the transmission power control method, the control target SIR may be set according to a degree of delay which can be allowed for the circuit type.
reducing a power value of a call according to the priority.
In addition, the transmission power control method may include the steps of:
FIG. 1 shows an example of a wireless communication system;
FIG. 2 shows a block diagram showing a base station and a mobile station for explaining a conventional transmission power control method;
FIG. 3A is a graph schematically showing an example of an upper limit value and a lower limit value set for a call;
FIG. 3B is a graph showing an example of transition of transmission power with respect to time;
FIGS. 4A�4C shows graphs for explaining change of transmission signal when receiving transmission power control by a conventional transmission power control apparatus;
FIG. 5 is a block diagram of a conventional transmission power control apparatus 600;
FIG. 6 shows a schematic graph for a case when transmission power reducing is not performed for transmission power of the base station;
FIG. 7 shows a schematic graph for a case when the transmission power reducing is performed by the conventional apparatus;
FIG. 8 is a schematic block diagram showing a transmission power control apparatus 100 according to the embodiment 1-1 of the present invention;
FIG. 9 is a flowchart of a call establishing process in the transmission power control apparatus 100 of the embodiment 1-1 of the present invention;
FIGS. 10A�10C are graphs showing an example of change of transmission power with respect to time under transmission power control by the transmission power control apparatus 100 of the embodiment 1-1 of the present invention;
FIG. 11 shows a schematic block diagram of a transmission power control apparatus 400 of the embodiment 1-2;
FIGS. 12 and 13 are flowcharts of call reestablishment process in the transmission power control apparatus 400 of the embodiment 1-2;
FIG. 14 show a schematic block diagram of a mobile station 700 of the embodiment 1-3 of the present invention;
FIG. 15 is a flowcharts of call reestablishment process in the transmission power control apparatus of the embodiment 1-3;
FIGS. 16 and 17 are flowcharts of control target SIR reestablishment process in the, transmission power control apparatus of the embodiment 1-4;
FIG. 18 is a schematic diagram of a transmission power control apparatus 1100 of the embodiment 2-1 of the present invention;
FIG. 19 is a schematic block diagram showing a part of the transmission power control apparatus 1200 relating to the embodiment 2-2 of the present invention;
FIG. 20 is a flowchart showing the transmission power control method of the transmission power control apparatus 1200 of the embodiment 2-2 of the present invention,;
FIG. 21 shows a detailed flowchart of a transmission power reducing method in the transmission power control method;
FIG. 22 is a graph showing a case in which transmission power reducing process is performed for base station transmission power by the transmission power control apparatus 1200 of the embodiment 2-2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, first embodiments and second embodiments of the present invention will be described with reference to figures. The first embodiments includes embodiments 1-1�1-4 and the second embodiments includes embodiments 2-1�2-2.
FIRST EMBODIMENTS (Embodiment 1-1)
First, the,transmission power control apparatus of the first embodiment of the present invention will be described by using FIGS. 8�10C. In this embodiment, probability that over-input to a power amplifier is detected is decreased by providing an upper limit value in transmission power control for transmission signals, and, the upper limit value is provided for each call in a plurality of calls which form a transmission signal according to a circuit type so that communication quality deterioration of calls of circuit switching type is prevented.
FIG. 8 is a schematic block diagram showing the transmission power control apparatus 100 according to the first embodiment of the present invention. FIG. 9 is a flowchart of a call establishing process in the transmission power control apparatus 100 of the embodiment 1-1 of the present invention. FIGS. 10A�10C are graphs showing an example of change of transmission power with respect to time under transmission power control by the transmission power control apparatus 100 of the embodiment 1-1 of the present invention. For example, the transmission power control apparatus 100 is included in a base station in a wireless communication system.
The transmission power control of this embodiment will be described with reference to FIGS. 10A�10C. For the sake of easiness of comparison, the example of the transmission power change here is the same as one shown in FIG. 4A. In this example, four calls, calls 1�4 are connected, the calls 1 and 2 are the circuit switching type in which the upper limit value is set to be 5, and the calls 3 and 4 are packet switching type in which the upper limit value is set to be 3. When each transmission power of the calls change as shown in FIG. 10A while each call receives limitation by the upper limit value, the total sum of the transmission power of the calls becomes as shown in FIG. 10B.
Next, a transmission power control apparatus of the embodiment 1-2 of the present invention will be described with reference to FIGS. 11�13. In this embodiment, in addition to setting the upper limit value for each call according to the embodiment 1-1, by changing the upper limit value adaptively in communication, it is prevented that the transmission power of the call of the packet switching type is reduced more than necessary, and it is prevented that the whole signals are reduced before the transmission amplifier due to inadequacy of reduction so that the call of the circuit switching type is affected.
FIG. 11 show a schematic block diagram of the transmission power control apparatus 400 of the embodiment 1-2. FIGS. 12 and 13 are flowcharts of call reestablishment process in the transmission power control apparatus 400 of the embodiment 1-2. For example, the transmission power control apparatus 400 is included in a base station in a wireless communication system. The same number is assigned to the same component as the transmission power control apparatus 100 of the embodiment 1-2.
FIG. 14 show a schematic block diagram of the mobile station 700 of the embodiment 1-3 of the present invention. FIG. 15 is a flowcharts of call reestablishment process in the transmission power control apparatus of the embodiment 1-3. The transmission power control apparatus of the embodiment 1-3 has the same configuration as that of the embodiment 1-1. The transmission power control apparatus is included in a base station in a wireless communication system.
Next, a transmission power control apparatus of the embodiment 1-4 of the present invention will be described with reference to FIGS. 16�17. In this embodiment, in addition to setting the control target SIR for each call according to the embodiment 1-3, by changing the control target SIR adaptively in communication, it is prevented that the transmission power of the call of the packet switching type is reduced more than necessary, and it is prevented that the whole signals are reduced before the transmission amplifier due to inadequacy of reduction so that the call of the circuit switching type is affected.
FIGS. 16 and 17 are flowcharts of control target SIR reestablishment process in the transmission power control apparatus of the embodiment 1-4. The transmission power control apparatus of this embodiment has the same configuration as that of the embodiment 1-2, and the mobile station of this embodiment has the same configuration as that of the embodiment 1-3. For example, the transmission power control apparatus is included in a base station in a wireless communication system.
In this case, a counter B on the value B is used. First, the counter B is cleared to B=0 in step 1001. The occurrence of call loss is monitored in step 1002. When call loss is detected, calls of the packet switching type are selected in step 1003, and the control target SIR of the calls is decreased by X. After that, the counter B is cleared again in step 1001, and monitoring of occurrence of call loss continues in step 1002.
As mentioned above, according to the transmission power control apparatus of this embodiment, the power control target SIR in transmission power control set for the call of the packet switching type can be changed triggered by occurrence of reducing process and/or occurrence of call loss. Therefore, the probability that the reducing process becomes necessary is decreased and communication quality of the call of the packet switching type can be improved.
SECOND EMBODIMENTS In the following, the second embodiments which includes an embodiment 2-1 and an embodiment 2-2 will be described.
Next, a transmission power control apparatus 1200 and a transmission power reducing method of the embodiment 2-2 of the present invention will be described by using FIGS. 19�22. FIG. 19 is a schematic block diagram showing a part of the transmission power control apparatus 1200 relating to the embodiment 2-2 of the present invention. FIG. 20 is a flowchart showing the transmission power control method of the transmission power control apparatus 1200 of the embodiment 2-2 of the present invention. FIG. 21 shows a detailed flowchart of a transmission power reducing method in the transmission power control method. FIG. 22 is a graph showing a case in which transmission power reducing process is performed for base station transmission power by the transmission power control apparatus 1200 of this embodiment. The transmission power control apparatus 1200 of this embodiment reduces the transmission power by assigning weight to amplitude of transmission signal of each call. The transmission power control apparatus is included in a base station in a wireless communication system for example.
First, the configuration of the transmission power control apparatus 1200 will be described by using FIG. 19. The same number is assigned to the same component of the transmission power control apparatus 1100 of the embodiment 2-1. The transmission power control apparatus 1200 includes a plurality of (for example N) baseband signal processing parts 1101, transmission power control parts 1102 each provided after the baseband signal processing part 1101, a power reducing part 1201 for reducing transmission power of the transmission signal, a priority information control part 1206, a priority information storing part 1207 which is a memory for example, a power amplifier 1108 and an antenna 1109. The power reducing part 1201 includes a baseband signal storing part 1202 including at least a memory, a power reducing control part 1203 for controlling signal processing in the power reducing part 1201, a baseband signal multiplexing part 1204 for multiplexing input signals, an over-input detection part 1205, and a weight processing part 1208 for performing weight processing on the basis of priorities set for transmission signal of each call.
Next, data in the table generated in step 1401 is rearranged by using priority as a key in step 1402, a priority of a call (which is not limited to one call) having the lowest priority at this time is determined as a priority (which will be called �priority Pri� in the following) which indicates a subject to be decreased.
When the reduced power amount does not reach the power reduction object value Pobj according to the judgement in step 1405, transmission power of every call having the priority Pri at the time is set to the minimum power value which keeps the synchronization, and the table is updated in step 1406. Then, after updating the table, priority Pri is released for the calls in which the power value is set to be the minimum value, and a new priority Pri is set as a value of a priority which is one stage higher than a priority which is originally assigned to the calls in which the priority Pri is released in step 1407. Then, the power reduction object value Pobj is calculated again in step 1404. The processes in steps 1404�1407 are repeated until the judgment result in step 1405 reaches the power reduction object value Pobj.
An example of a process result of the transmission power reducing method of this embodiment is shown in FIG. 22. FIG. 22 is a graph schematically showing a case in which transmission power reduction process is performed by the transmission power control apparatus 1200. The condition of this example is the same as that of FIG. 6, in which signals are transmitted for calls 1�5, and it is assumed that the maximum allowable transmission power value of the base station is 10 on the vertical axis of the graph, and the transmission power exceeds at times 2, 3 and 6.
In addition, in FIG. 22, priority of a call 1 is the highest, and the priority of call 5 is the lowest, and priorities of calls 2�4 are the same.
In this condition, as shown in FIG. 22, at the times of 2 and 3, by reducing only the transmission power of the call 5, whole transmission power falls within 10. At the time of 6, the whole transmission power does not fall within 10 only by reducing the transmission power of call 5. In this case, the transmission power of call 5 is set to the minimum value, and, in addition, the transmission powers of calls 2�4 having low priority are reduced equally. In any time, the transmission power of the call 1 which has the highest priority is constant in which the transmission power of the call 1 is unaffected by the transmission power reduction. That is, communication quality is kept.
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