WO2004049590A1

WO2004049590A1 - Outer loop power controlling method of multi-services

Info

Publication number: WO2004049590A1
Application number: PCT/CN2002/000850
Authority: WO
Inventors: Sheng Liu; Baijun Zhao
Original assignee: Utstarcom (China) Co., Ltd.
Priority date: 2002-11-26
Filing date: 2002-11-26
Publication date: 2004-06-10
Also published as: CN100386972C; AU2002368381A1; CN1685628A

Abstract

The present invention relates to outer loop power controlling method in CDMA system. Disclosed is a method for obtaining an object SIR value for each of multi-services in an outer loop power control circuit of multi-services. The method comprises the steps of: generating an adjusted object value of SIR I’i (ki+1) for multi-services by the outer loop power control circuit of multi-services, where I represents each of the multi-services, the range of which is 1, 2, …, n; correcting the respective adjusted object values of SIR by a SIR object correcting unit; updating the object values of SIR for each services by a SIR object updating unit, depending on the current adjusted object value of SIR and the current object value of SIR. After generating an adjusted object value of SIR I’i (ki+1), the method according to the invention corrects the value to obtaining the object value of SIR so as to prevent the outer loop power control circuit from over-controlling.

Description

Outer loop power control method in multi-service multiplexing

The present invention relates to an outer loop power control method in a code division multiple access (CDMA) system, and more particularly to a system for preventing an external power control loop from being over-controlled when multiple services are multiplexed in the same physical channel in a CDMA system. And methods. Background technique

In CDMA systems, the capacity and coverage of the system depend to a large extent on the interference experienced by the user. Among them, power control technology has become an effective means of reducing inter-channel interference and has become a kind of CDMA communication system. Key technology. Among them, closed-loop power control has the advantage of high control precision, and has been widely used in second and third generation CDMA mobile communication systems.

The typical closed-loop power control in a CDMA system consists of two loops inside and outside. The inner loop controls the power of the transmitting end by comparing the measured value of the signal-to-interference ratio (SIR) of the receiving end with the target SIR, and the control rate of the inner loop power control is fast, such as 1500 times per second in the WCDMA system. . Outer loop power control is responsible for generating the required target SIR for inner loop power control. It adjusts the SIR target value to track changes in the wireless channel environment to maintain the system agreed quality of service (QoS) at the time of service establishment. The outer loop power control has a slower control frequency, typically a few hertz to several tens of hertz.桢 Error rate (FER) or transport block error rate (BLER) is a common quality of service parameter in outer loop power control. The target value is determined by factors such as the user's service type and the current load status of the system.

In a typical outer loop power control algorithm, when the actually measured quality parameter such as FER/BLER is lower than the FER/BLER target value, the external power control loop increases the SIR target value, thereby increasing the transmit power by the inner loop power control; Conversely, when the actual measured FER/BLER quality parameter is higher than the FER/BLER target value, external work The rate control loop reduces the SIR target value, thereby reducing the transmit power by inner loop power control.

In the third generation mobile communication system (3G), multiple services can be multiplexed on the same physical channel at the same time, thus providing powerful support for applications such as multimedia services, simultaneous use of voice and background data services, and therefore, the same Multi-service multiplexing in physical connections is a typical feature in 3G systems.

As mentioned earlier, the inner loop power control is controlled based on the SIR measurement of a certain physical channel. When multiple services are simultaneously multiplexed on the same physical channel, there is only one common internal power control loop. Therefore, in order to guarantee the QoS required for all services, the SIR target value generated by the outer loop power control loop should be such that the SIR obtained by all services is not lower than the respective SIR. To this end, the highest value of the required SIR in all services can be selected as the SIR of the outer loop power control, thus ensuring the SIR requirements of all services. Detailed information on this technique is disclosed in International Patent Application No. WO 99/53,701, issued on Oct. 21, 1999, and U.S. Patent No. 6,173,162, issued Jan. The contents of both patents (applications) are hereby incorporated by reference.

Figure 1 shows a schematic diagram of an external power control loop based on the above techniques in the case of multi-service multiplexing in the prior art. Figure 1 shows the uplink. It is assumed that there are n services #1, #2, .., #n multiplexed in the system. Each service has its own external power control loop, and each loop is in each other. Control independently. The following is a detailed description of the external power control loop 110 of the service #1, and the other service branches are the same, and need not be described.

The external power control loop 110 of service #1 is located in a radio network controller (RNC) and includes an outer loop power control unit 11 and an SIR target value update unit 12. The outer loop power control unit 11 obtains the SIR target adjustment amount of one service #1 based on the measured QoS of the service #1 and the target QoS of the service #1, based on the conventional outer loop power control method. The outer loop power control unit 11 sends the adjustment amount to the SIR target value update. Unit 12.

FIG. 2 shows one of the implementations of the update unit 12. The SIR target value of the previous moment is added to the SIR target value adjustment amount at the current time after passing through a delay unit 7, and the SIR target value at the current time is obtained. Moreover, it should be understood that other software or hardware means of implementing the update unit can be obtained by those skilled in the art.

The SIR target value SIR _T 1 for the service #1 obtained by the update unit 12 is then sent to a highest SIR target value selection unit 5. The SIR target values SIR _T 2, ..., SIR _T n for other services can be obtained in the same manner, and these values are also sent to the highest SIR target value selecting unit 5. The highest SIR target value selection unit 5 selects the highest SIR target value as a common SIR target value output to compare with the system's SIR measurement value, thereby implementing inner loop power control.

Since the maximum value of the SIR target in all external power control loops is always selected as the common SIR target value, for other loops whose local SIR target value is lower than this maximum, it may be because the actually obtained SIR is higher than its The local SIR target value, and thus the quality parameters such as FER/BLER will be superior to the QoS required for the service. Thus, based on conventional outer loop power control methods, all such loops will continue to reduce their respective local SIR target values to respond to such false "good channel quality" conditions. In this way, once the channel environment, the service rate, and the like are changed, the SIR target value of each external power control loop is low, which causes continuous frame errors and loop oscillations, thereby greatly affecting the performance of the outer loop power control. The following is a detailed analysis of the situation in which control occurs.

The present invention recognizes that there are three typical cases in which the relationship between the highest SIR target value and the QoS requirements of each service is as follows:

(1) The highest SIR target value exceeds the QoS requirements of its corresponding service. Since this value is used as a public SIR target, it is clear that this time also exceeds the QoS requirements of other services;

(2) The highest SIR target value cannot meet the QoS requirements of its corresponding service, but it can meet or exceed the QoS requirements of some other services; (3) The highest SIR target value cannot meet the QoS requirements of all services.

For case (1), the highest SIR target value will be adjusted downward. At this time, it is reasonable to adjust the local SIR target value of other services appropriately, and JL will not have control problems. For case (2), the highest SIR target value will be adjusted upwards, but for some other services that can meet or exceed the QoS requirements, according to the prior art, the local SIR target value will be adjusted downwards to the fake The "channel quality is good" condition responds, which will cause potential over-control problems. For case (3), the local SIR target values of all services are allowed to be adjusted upwards, and no over-control problem occurs.

However, the existing external power control loop does not distinguish the above three cases, and adopts a unified adjustment manner for all service branches. Therefore, in the case of the (2) case, when the channel environment and the service rate change, There is a possibility that control has occurred. Summary of the invention

The present invention provides a system and method for obtaining an SIR target value of each service branch in an external power control loop in the case of multi-service multiplexing, and the system and method distinguish the foregoing three situations, thereby effectively solving the problem In the above CDMA system, when the multiple services are multiplexed on the same physical channel, the external power control loop is prone to over-control. The method of the invention comprises the following steps:

(a) The SIR target adjustment amount I\(ki+1) for the service is generated by the outer loop power control unit for each service, where i represents each multiplexed service, and the value may be 1, 2 ...n; and

(b) The SIR target value update unit for each service obtains the SIR target value of each service based on the current SIR target adjustment amount Γ i ( ki+1 ) of each service and its nearest SIR target value;

The method is characterized by further comprising:

(al) correcting the respective SIR target adjustment amounts r\(ki+i) by the SIR target value correcting unit for each service after the step (a) to prevent occurrence The steps of control.

It can be seen that the present invention needs to correct the SIR target adjustment amount Γ i ( ki +1 ) before updating the local SIR target value of each external power control loop, and the correction can effectively prevent over control. happened. For example, the correction may be to determine whether a local SIR target value is reduced due to a false "good channel quality" condition, and if so, the original local SIR target value is kept unchanged.

Furthermore, the present invention also provides a system for obtaining an SIR target value for each service in an external power control loop in the case of multi-service multiplexing, the system comprising:

An outer loop power control unit of each multiplexing service is used to generate a new SIR target adjustment amount 每个 i ( ki+1 ) for each service;

The SIR target value updating unit of each multiplexing service is configured to obtain a new SIR target value of each service according to a new SIR target adjustment amount Γ j ( ki+1 ) of each service and a recent SIR target value of the service;

The system is further characterized by:

The SIR target correction unit is configured to correct the SIR target adjustment amount ( ki +1 ) to prevent over-control.

Further, the present invention also provides an outer loop power control method using the above method for obtaining an SIR target value. DRAWINGS

The above-described advantages and other advantages of the present invention will become more apparent from the detailed description of the invention. In the drawing:

Figure 1 is an external power control loop used in the prior art for multiplexing; 2 is an exemplary implementation of an SIR target value update unit in the external power control loop shown in FIG. 1;

Figure 3 is an external power control loop for multiplexing in accordance with the present invention;

4 is a workflow diagram of an external power control loop for multiplexing in accordance with the present invention;

Figure 5 is a preferred embodiment of one of the steps of the workflow shown in Figure 4;

Figure 6 is an alternate implementation of the workflow shown in Figure 5; and Figure 7 is an alternate implementation of the workflow shown in Figure 5. Detailed ways

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same components are given the same reference numerals.

[1] Embodiments in a system in which the RNC and the BTS are separated in the uplink As described above, the basic idea of the present invention is to distinguish between the three cases of the relationship between the highest SIR target value and each service QoS requirement, Before the local SIR target value, the SIR target adjustment amount Γ i ( ki+1 ) is corrected as needed to prevent the possibility of over-control. This correction is to adjust the absolute value of the SIR target adjustment amount 1 ( ki +1 ) downward (at most, to maintain the SIR target adjustment amount Γ \ ( ki +1 ) itself), ^ used in each SIR target correction unit This is achieved by a device that adjusts the SIR target adjustment amount r ki+l ) downward.

A system structure for obtaining an SIR target value of each service branch in an external power control loop in the case of multi-service multiplexing according to a preferred embodiment of the present invention is shown in FIG. The system is located in the RNC and includes external power control loops 310, 320, ... 3n0 for each service leg. The composition of each external power control loop is basically the same, below The configuration of each loop will be described by taking the external power control loop 310 for the service #1 as an example. The external power control loop 310 includes an SIR target correction unit 13 in addition to the outer loop power control unit 11 and the SIR target value updating unit 12 shown in FIG. The system also includes a selection unit 5 for selecting a highest SIR target value.

After the selection unit 5 selects the highest SIR target value, for example, the number m of the path of the highest SIR target value is sent to a recording unit (not shown) of the RNC, and the outer loop power control unit Each time the new SIR target adjustment is output, the recording unit records the new SIR target adjustment amount for each service branch. When the recording unit knows m, the target value adjustment amount closest to the service m corresponding to the highest SIR target value can be output. The recording unit can be, for example, a memory in the RNC. It should be understood that only one embodiment of the service m and the adjustment amount corresponding to the highest SIR target value is obtained, and those skilled in the art may use other methods instead.

In a preferred embodiment of the present invention, for the branch of the service #1, the new SIR target adjustment amount of the service #1 output by the outer loop power control unit 11 is first sent to the SIR target value correcting unit 13, The adjustment amount of the current path having the highest SIR target value recorded by the recording unit 6 at the previous time is also sent to the SIR target value correcting unit 13. The SIR target value correcting unit 13 adjusts the newly generated SIR target adjustment amount according to the obtained two parameters, and outputs a corrected SIR target value adjustment amount of the service #1, and inputs it to the updating unit 12, where it is obtained. The SIR target value SIR _T 1 is sent to the selection unit 5. The branches of other services also similarly obtain their respective SIR target values SIR _T 2 SIRxn and feed them to the selection unit 5, thereby selecting a common SIR value. The selected common SIR target value is then compared with the measured SIR target value to achieve outer loop power control.

Figure 4 shows a flow chart of the operation of the present invention. In step S400, a method of obtaining an SIR target value in an external power control loop in the case of multi-service multiplexing is started according to the present invention. In step S410, each outer loop power control unit 11, 21, ... nl SIR target adjustment Γ i ( ki+1 ) for services #1, #2, ... #n at times k+1, respectively, where i represents the i-th service branch, and the value is 1, 2 , ..., n. The adjustment amount (ki+1) is input to each SIR target value correction unit.

Next, in step S420, each SIR target correction unit corrects the SIR target adjustment amount ki (ki+1) (the process of correction will be described in detail below with reference to Fig. 5). In step S430, the SIR target adjustment amount obtained after the correction in step S420 is sent to the SIR target value update unit to perform the SIR target value update. In step S440, the selecting unit 5 selects the highest SIR target value from the SIR target values of the respective service branches as the common SIR target value for subsequent inner loop power control. In step S450, the method of obtaining the SIR target value in the external power control loop in the case of multi-service multiplexing according to the present invention ends.

The process in which the SIR target correction unit performs the correction will be described in detail below with reference to FIG. In step 410, after each outer loop power control unit generates a new SIR target adjustment amount (ki+1) (i=l, 2, . . . , n) at time k+1, in step S411, The adjustment amount is sent to each SIR target value correction unit together with the current target SIR adjustment amount Γ _m ( k _m ) of the external power control loop corresponding to the service m corresponding to the current highest SIR target value recorded by the recording unit ( l < m < n ). In step S412, the first judging unit of each SIR target value correcting unit judges whether Γ _m (k _m ) from the recording unit is less than 0, and if so, the operation proceeds to step S414, where ki+1 is used by the first correcting unit. ) as the adjustment amount (this corresponds to the above case (1)). Then, the operation proceeds to step S420.

If it is judged in step S412 that r _m (k _m ) > 0, the flow proceeds to step S416, and it is further determined by the second judging unit whether 1\(ki+1) is <0. If yes (this corresponds to those service branches in the foregoing case (2) where control is generated), the operation proceeds to step S418, 1 (ki+1) is set to 0 by the second correction unit, and then the operation proceeds to step S420. . Otherwise (this corresponds to those industries in the above case (2) that do not have over control The branch road and the case (3)), the operation proceeds to step S414, the first correction unit uses Γ i ( ki+1 ) as the SIR target value adjustment amount, and the operation proceeds to step S420.

The above describes an embodiment in which ki+1) is used as the adjustment amount for both the first and third cases. However, for the first case (ie, r _m (k _m ) <0), a correction amount of r ki+l) (where 0<1) can also be used as the SIR target value adjustment amount. The coefficient is introduced here to control the rate of change of the adjustment amount of the target SIR of the service i. For services with lower relative quality requirements, because the SIR update rate is faster, the coefficient can take a smaller value than other services. This allows the SIR update rate for all services to be close.

The correction process at this time is as shown in Fig. 6. When it is judged at step S412 that ₁ „(1 _3⁄4 ) <0, the operation proceeds to step S414, and λίΓί (ki+1) is adopted as the adjustment amount by a third correction unit. Then, the operation proceeds to step S420. If it is judged at step S412 that ₁ „(1^) > 0, the operation proceeds to step S416, and it is judged whether or not r ki+l) is smaller than 0. If yes, the operation proceeds to step S418, and the adjustment amount 1\(ki+1) is set to 0 by the second correction unit, otherwise the operation proceeds to step S419, and the first correction unit uses Γ i (ki+1 ) as the adjustment amount. . After the correction, the operation proceeds to step S420.

In addition, in the previous discussion, it is considered that for the case of 1^„ ₁ (k _m ) <0, it is reasonable to down-regulate the SIR target values of all the branches, and there is no such thing as a false "good channel quality". This leads to over-control. However, if the SIR target value adjustment of each service branch is excessively lowered, it will cause potential over-control. To avoid this situation, it can be further judged that the current highest SIR target value corresponds to the service m continuously appearing local target SIR. Whether the number of reductions exceeds a predetermined threshold.

As shown in Fig. 7, in step S4121, the number C of times „ ₁ ( k _m ) < 0 is counted by a counter. In step S4122, it is judged by a threshold judging means whether the C value is smaller than a threshold value Thr, if If it is less than, then the process proceeds to step S414, and λίΓ; (ki+1) is used as the adjustment amount. If it is determined in step S4122 that the C value is greater than the threshold value Thr, the operation proceeds to step S418", and the second correction unit is used to adjust The integer Γ i ( ki+1 ) is set to 0. Here, the threshold Thr can be selected as needed according to factors such as service, QoS requirements, and channel. In this embodiment, the remaining steps are the same as those shown in FIG. 6, and will not be described in detail.

[2] Implementation in a system in which the RNC is integrated with the BTS in the uplink. The separation of the RNC from the BTS is described in Section [1]. At this time, the entire acquisition process of the SIR target adjustment amount correction process and the highest SIR target value according to the present invention is realized in the RNC.

However, for a system employing a centralized control mode, i.e., a system in which the RNC and BTS functions are integrated in the BTS, the SIR target adjustment amount correction process and the entire acquisition process of the highest SIR target value according to the present invention can be implemented in the BTS. The remaining aspects of this implementation are similar to those in Section [1] and will not be described in detail.

[3] Implementation in the downlink

The process of implementing the SIR target adjustment amount correction process and obtaining the highest SIR target value according to the present invention in the uplink is described in the [1] and [2] sections, but the same applies to the downlink. At this time, the RNC and BTS functions are integrated in the user equipment UE, and the SIR target adjustment amount correction process and the process of obtaining the highest SIR target value according to the present invention are implemented by the UE itself. Its implementation is similar to that in the uplink and will not be described in detail. The invention has been described in detail above based on preferred embodiments. In various preferred embodiments, it is described how the adjustment amount r _m ( k _m ) of the service m at the previous time (ie, k time) and the certain multiplexing service i are at the current time (ie, according to the current highest SIR target value). The SIR target adjustment amount (ki+1) at time k+1 is used to implement the SIR target adjustment amount correction process of the present invention. However, those skilled in the art should understand that the adjustment amount corresponding to the highest SIR target value of the previous moment (k time) is considered. In addition, the adjustment amount corresponding to the highest SIR target value at a more advanced time (for example, kl, k-2, etc.) may be further considered, combined with the current S+1 target adjustment amount r ki+l at the k+1 time, To implement the SIR target adjustment amount correction process of the present invention. In the present invention, the user equipment UE may be any user equipment having an unlimited access function, including but not limited to a mobile phone, a portable computer, a personal digital assistant, and the like. Meanwhile, the present invention is applicable to a CDMA system supporting multi-service multiplexing on the same physical channel, including but not limited to an IS95 system, a WCDMA system, a CDMA2000 system, and a TD-SCDMA system.

The preferred embodiments of the present invention are for illustrative purposes only and are not to be construed as limiting the invention. The invention can be implemented in software, hardware or a combination of both. A person skilled in the art can obtain any variations and modifications of the present invention in light of the above description, but such modifications and improvements are included in the scope and spirit of the invention as defined in the appended claims.

Claims

A method for obtaining an SIR target value for each service (#1, #2...#n) in an external power control loop in the case of multi-service multiplexing, the method comprising

(a) The SIR target adjustment amount (3⁄4+1) for the service is generated by the outer loop power control unit (11, 12...In) for each service (#1, #2...#n) ), where i denotes each multiplexing service, and the value may be 1, 2...n;

(b) From the SIR target value for each service, the salary unit (I ² , 22, ... n2) is obtained based on the current SIR target adjustment Γί( +1) for each service and its nearest SIR target value. SIR target value for each service (SIR _T 1, SIR _T 2...SIR _t n ); the method is characterized by further comprising:

(al) correcting the respective SIR target adjustment amounts I (kf l) by the SIR target value correcting units (13, 23, ... n3) respectively for each service after the step (a) Steps to prevent over control.

The method according to claim 1, characterized in that said correcting step (al) adjusts the absolute value of each SIR target adjustment amount r ki + l) generated in said step (a) downward.

3. Method according to claim 1 or 2, characterized in that said correcting step (al) further comprises the steps of:

The generated SIR target adjustment amount r^ki+l) and the current highest SIR target value corresponding to the service target m's nearest target SIR adjustment amount Γ _m (k _m ) are supplied to the SIR target correction unit for each service (13) 23, η3) , where lm<n; and in the case where the SIR target value correcting unit (13, 23, ... n3) judges r _m ( k _m ) >0 and Γί (ki+1) <0, The adjustment amount 1^ (ki+1) is set to 0, so that the original local SIR target value remains unchanged.

The method according to any one of claims 1 to 3, characterized in that the correction Step (al) also includes the following steps:

In the case where the SIR target value correcting unit (13, 23, ... n3) judges r _m (k _m ) < 0, the SIR target value is updated using 1 ( ki +1 ) as the adjustment amount.

The method according to any one of claims 1 to 3, characterized in that the correcting step (al) further comprises the following steps:

In the case where the SIR target value correcting unit (13, 23, ... n3) judges that r _m (k _m ) > 0 and (ki + 1) > 0, I\ (ki + 1) is used as the adjustment amount to update SIR target value.

The method according to claim 4, characterized in that the method further comprises the following steps:

In the case where the SIR target value correcting unit (13, 23, ... n3) judges r _m ( k _m ) <0, the SIR target is updated with ^r ki+l) , 0<λί<1 as the adjustment amount. value.

7. Method according to claim 4 or 6, characterized in that the method further comprises the following steps:

The step of judging whether the number C of times where „ ₁ (k _m ) is less than 0 is less than a threshold Thr, and if so, ki+1), 0<λ _; <1 _{5 is} used as the adjustment amount; otherwise, the adjustment amount I\ (ki) +1) is set to 0.

8. A system for obtaining an SIR target value for each service (#1, #2...#n) in an external power control loop in the case of multi-service multiplexing, the system comprising: An outer loop power control unit (11, 12...In) for each multiplexing service (#1, #2"., used for generating each service (#1, #2... #n) The new SIR target adjustment amount Γ i ( ki+1 );

A plurality of SIR target value update units (12, 22, ... ιι2) for each multiplexed service, for adjusting the amount I\(ki+1) according to the new SIR target of each service and the service The most recent SIR target value obtains the new SIR target value (SIR _T 1 , SIR _T 2...SIR _T n) for each service; The system is further characterized by:

A plurality of SIR target correction units (13, 23, ... η3) are respectively used for each multiplexed service (#1, #2...#η) for adjusting the SIR target (ki+ 1) Make corrections to prevent over-control.

9. System according to claim 8, characterized in that said plurality of SIR target correction units (13, 23, ... n3) further comprise a plurality of outer loop power control units (11, 12... In The device that adjusts the absolute value of each SIR target adjustment amount (ki+1) downward.

10. The system according to claim 8 or 9, characterized by further comprising: a recording unit (6) for adjusting the nearest SIR target amount of the service m corresponding to the current highest SIR target value by ¹ ₁ „ (1) _1⁄21 ) is supplied to the SIR target correction unit (13, 23... _n3 ) for each service, where l<m<n.

The system according to any one of claims 8 to 10, wherein each of the SIR target correction units (13, 23, ..., n3) comprises:

a first determining unit, configured to determine whether 1^„ ₁ ( k _m ) <0 is satisfied;

a second determining unit, configured to determine, if the first determining unit determines r _m ( k _m ) >0, whether ( ki+1 ) <0;

a second correcting unit, configured to set the adjustment amount I\(ki+1) to 0 and send it to each SIR target value update if it is judged that 1^(k _m ) >0 JLTj ( ki+1) <0 Unit (12, 22, ... n2).

The system according to claim 11, characterized in that each of the SIR target correction units (13, 23, ... n3) further comprises:

a first correcting unit for using I ( ki +1) in the case where it is judged that Γ _m ( k _m ) <0 or Γ _m ( k _m ) >0 and 1\ ( ki+1) >0 Each SIR target value updating unit (12, 22, ... n2) is input as an adjustment amount.

13. The system according to claim 11, wherein each of the SIR target correction units (13, 23, ... n3) comprises: The third correcting unit is configured to input each of the SIR target value updating units (12, 22, . . . as the adjustment amount when determining that r _m (k _m ) <0 is 1\(ki+1), 0<λί<1. .n2

The system according to claim 12 or 13, characterized in that each of the SIR target correction units (13, 23, ... n3) further comprises:

a counter for counting the number C of times when the 1 ¹ ₁ „(1^ ₁ ) is judged to be less than 0; the threshold determining means for determining whether the number C is less than a threshold Thr; wherein, the OThr is adjusted The quantity 1 (kf l) is set to 0. When judging C<Thr, use 0<λί< 1, as the adjustment amount input.

SIR target value update unit (12, 22, ... n2).

15. An outer loop power control method in the case of multi-service multiplexing, the method comprising the following steps:

(a) Each multiplexed service obtains a new SIR adjustment I\(ki+1) for the service branch based on its measured QoS and target QoS, where i represents each multiplexed service and may have a value of 1. 2...n;

(b) The SIR target value update unit for each service obtains the SIR target value of each service based on the current SIR target adjustment amount I\(ki+1) of each service and its nearest SIR target value;

(c) selecting the highest SIR target value from the obtained SIR target values for each service;

(d) Implementing power control based on the highest SIR target value and the measured SIR target value; the method is characterized by further comprising:

(al) The step of correcting the respective SIR target adjustment amounts (ki+1) by the SIR target value correction unit for each service after the step (a) to prevent the occurrence of the control.