WO2014206317A1 - Power control method and device - Google Patents

Abstract

Disclosed in an embodiment of the present invention are a power control method and device capable of switching the uplink carriers of a user equipment (UE), the method comprising: acquiring transmission power on a first uplink carrier, and the interference noise power difference on the first uplink carrier and a second uplink carrier; calculating the difference between the transmission power and the interference noise power difference to obtain initial transmission power on the second uplink carrier; and controlling the power on the second uplink carrier when switching from the first uplink carrier to the second uplink carrier. The embodiment acquires the transmission power and interference noise power difference on a first uplink carrier to obtain an initial transmission power on a second uplink carrier, such that a UE can be configured according to the initial transmission power when switching from the first uplink carrier to the second uplink carrier, so as to enable the UE to quickly start power synchronization after having been switched to the second uplink carrier, thus facilitating load balancing.

Description

 Power control method and device

Technical field

 Embodiments of the present invention relate to an uplink carrier load balancing technique, and more particularly to a power control method and apparatus. Background technique

 Currently, wireless network technology generally assumes that the downlink traffic of the network is always greater than the traffic of the upper-end service, so more radio resources are configured for the downlink relative to the uplink. For example, the downlink UE receives data from multiple carriers on the network side, while the uplink only configures one carrier. When the number of UEs is small, the mutual interference between UEs in the uplink transmission process is not significant; but when the number of UEs in the network is large, the uplink interference between UEs is significantly enhanced. In order to overcome the mutual interference, the UE can transmit higher power to ensure the signal to interference and noise ratio of the uplink received signal, but this obviously leads to a decrease in transmission efficiency.

 When the number of the UEs is large, the uplink carrier corresponding to the other downlink carriers may be in a state of low uplink interference. If the UE switches the currently working uplink carrier to the uplink carrier with less uplink interference, The uplink interference between the UEs is reduced, and the load between the uplink carriers is balanced. In the process of implementing the present invention, the inventor has found that, in order to perform uplink carrier switching, how to control the initial transmission power on the new uplink carrier, that is, the initial transmission power of the DPCCH (Dedicated Physical Control Channel) on the new uplink carrier. , is a key issue, and there is no effective solution in the prior art. Summary of the invention

 In view of this, an object of the embodiments of the present invention is to provide a power control method and apparatus to solve the problem of how to set the initial transmit power on a new uplink carrier when uplink carrier switching.

 In an aspect, the embodiment of the present invention provides a power control method, which is used for uplink carrier switching of a user equipment UE, where the method includes:

 Obtaining the transmit power on the first uplink carrier, and,

Obtaining an interference noise power difference, where the interference noise power difference is on the first uplink carrier The difference between the interference noise power and the interference noise power on the second uplink carrier;

 Obtaining an initial transmit power on the second uplink carrier by using a difference between a transmit power of the first uplink carrier and the interference noise power difference;

 And performing power control on the power on the second uplink carrier when switching from the first uplink carrier to the second uplink carrier according to the initial transmit power.

 Preferably, the transmit power on the first uplink carrier includes:

 Transmit power on the last time slot of the first uplink carrier, or

 The average value of the transmission power on the last subframe of the first uplink carrier.

 Preferably, the acquiring the interference noise power difference includes:

 Acquiring the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier according to the system information block SIB7 in the network broadcast message;

 Obtaining the interference noise power difference according to a difference between the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier.

 Preferably, the acquiring the interference noise power difference includes:

 The interference noise power difference value is obtained by receiving the interference noise power difference value sent by the network side.

 Preferably, the method further includes:

 Before performing power control on the power on the second uplink carrier when switching from the first uplink carrier to the second uplink carrier according to the initial transmit power:

 Obtaining a power correction amount, where the power correction amount is determined according to a path loss difference between the first uplink carrier and the second uplink carrier;

 The initial transmission power is corrected according to the power correction amount.

 On the other hand, the embodiment of the present invention further provides a power control apparatus, which is used for uplink carrier switching of a user equipment UE, where the apparatus includes:

 a first uplink carrier transmit power acquiring unit, configured to acquire transmit power on the first uplink carrier, and an interference noise power difference obtaining unit, configured to acquire an interference noise power difference, where the interference noise power difference is the first The difference between the interference noise power on the uplink carrier and the interference noise power on the second uplink carrier;

a second uplink carrier initial transmission power acquiring unit, configured to pass on the first uplink carrier And obtaining a difference between the transmit power and the interference noise power difference, and acquiring an initial transmit power on the second uplink carrier;

 And a second uplink carrier power control unit, configured to perform power control on the power on the second uplink carrier when switching from the first uplink carrier to the second uplink carrier according to the initial transmit power.

 Preferably, the transmit power on the first uplink carrier includes:

 Transmit power on the last time slot of the first uplink carrier, or

 The average value of the transmission power on the last subframe of the first uplink carrier.

 Preferably, the interference noise power difference obtaining unit includes:

 An interference noise power acquisition subunit, configured to acquire, according to the system information block SIB7 in the network broadcast message, the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier;

 And an interference noise power difference obtaining sub-unit, configured to acquire the interference noise power difference according to a difference between the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier.

 Preferably, the interference noise power difference obtaining unit is configured to acquire the interference noise power difference value by receiving the interference noise power difference value sent by the network side.

 Preferably, the device further includes:

 a power correction amount obtaining unit, configured to obtain a power correction amount, where the power correction amount is determined according to a path loss difference between the first uplink carrier and the second uplink carrier;

 And a power correction unit, configured to correct the initial transmit power according to the power correction amount before triggering the second uplink carrier power control unit.

In the embodiment of the present invention, the initial transmit power on the second uplink carrier is obtained by acquiring the transmit power on the first uplink carrier and obtaining the interference noise power difference between the first uplink carrier and the second uplink carrier, so that when the UE is from the first When the uplink carrier is switched to the second uplink carrier, the power on the second uplink carrier can be set according to the initial transmit power, so that the UE can quickly enter the power peer after switching to the second uplink carrier, which is beneficial to implement. The balance of the load. DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

 1 is a flow chart illustrating a method of an embodiment of the present invention;

 2 is a schematic diagram showing subframes and time slots when uplink carrier switching;

 3 is a flow chart illustrating a method of Embodiment 2 of the present invention;

 Figure 4 is a schematic view showing the third embodiment of the present invention. detailed description

 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 Numerous specific details are set forth in the Detailed Description of the invention in the Detailed Description of the invention. In other instances, well-known methods, procedures, components, and circuits are not described in detail to avoid unnecessarily obscuring the embodiments. Embodiment 1

 FIG. 1 is a flowchart of a method according to an embodiment of the present invention. This embodiment discloses a power control method for uplink carrier switching, which is used for a user equipment UE, and the method includes:

 S101. Acquire transmission power on the first uplink carrier. It will be readily understood by those skilled in the art that the transmission power referred to in the present invention is the transmission power of the DPCCH.

 In this embodiment or some other embodiments of the present invention, the transmit power on the first uplink carrier may include:

Transmit power on the last time slot of the first uplink carrier. FIG. 2 schematically depicts a subframe and a time slot when the uplink carrier 1 is switched to the uplink carrier 2, where each subframe of the uplink carriers 1 and 2 is There are three time slots, and the transmission power on the uplink carrier 1 used at this time is specifically the transmission power on the last time slot of the uplink carrier 1.

 Or the sending power on the first uplink carrier may also include:

 The average value of the transmission power on the last subframe of the first uplink carrier. Still taking FIG. 2 as an example, the transmission power on the uplink carrier 1 used at this time is specifically the average value of the transmission power of the three time slots of the last subframe of the uplink carrier 1.

 5102. Obtain an interference noise power difference, where the interference noise power difference is a difference between the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier.

 The interference noise power is the power of the interference plus noise, which is the value obtained by subtracting the second uplink carrier interference noise power from the first uplink carrier interference noise power. The difference can be obtained in various ways. The manner in which the difference is obtained in this embodiment is not limited, and the manners that can be used herein are not deviated from the spirit and scope of the present invention.

 In addition, the sequence of the above S101 and S102 is not limited in this embodiment. For example, the transmit power of the first uplink carrier and the second uplink carrier may be acquired first, and then the interference noise power difference between the first uplink carrier and the second uplink carrier may be acquired. It can also be reversed and can be obtained at the same time.

 5103. Obtain an initial transmit power on the second uplink carrier by using a difference between a transmit power of the first uplink carrier and the interference noise power difference. which is,

 The initial transmission power of the second uplink carrier = the transmission power of the first uplink carrier (first uplink carrier interference noise power - second uplink carrier interference noise power).

 When the UE quickly switches between the two uplink carriers, the ultimate goal is to enable the UE to quickly enter the power peer after switching to the second uplink carrier, so the initial transmit power of the second uplink carrier should be maintained near the target received power value. Since the interference levels on the two uplink carriers are different, the target received powers on the two carriers are also different, but the signal to interference and noise ratios of the received signals can be considered to be approximately the same.

 The received signal to noise ratio on the first uplink carrier, carri er 1, is:

 SINR1 (dB) = DPCCH_power_l_PL_l _ (I_N)_l

 Wherein, DPCCH_power_l is the transmission power on the first uplink carrier, PL_1 is the uplink path loss on the first uplink carrier, and (I_N)_1 is the dBm value of the interference plus noise on the first uplink carrier.

Similarly, the received signal to noise ratio on the second uplink carrier, carrier 2, is: SINR2 (dB) = DPCCH_ power_2-PL_2- (I_N)_2

 Wherein DPCCH_power_2 is the transmit power on the second uplink carrier, PL_2 is the uplink path loss on the second uplink carrier, and (I_N)_2 is the dBm value of the interference plus noise on the second uplink carrier.

 Because it is aimed at achieving the same received signal to interference and noise ratio, it has:

 SINR1 (dB) = SINR2 (dB), ie

 DPCCH_power_l -PL_1 - (I_N)" = DPCCH_ power_2 - PL - 2 - (I_N) _2

 DPCCH— power_2 = DPCCH_power_l - ( (I_N)_1- (I_N)_2) - (PL_1_ PL_2) .

 For the path loss difference (PL_1 _PL_2 ), the uplink path loss model is generally written as a function of distance and carrier frequency, for example:

PL- 16. 91og ₁₀ (d) +32. 8 + 201og ₁₀ (f _c )

 Where d is in m, f. The unit is GHz.

 Since the uplink carrier frequency interval is a small amount relative to the carrier frequency center, the following approximation can be made:

If the carrier height is 5匪 z ) and fc is 2GHz, the above path loss difference is as follows. It can be seen that the difference between the uplink and the two carrier paths is not large, that is, (PL_1_PL_2) can be ignored.

 So you get:

 DPCCH— power_2 = DPCCH_ power_l - ( (I— N)_l_ (I_N)_2 )

 That is, the initial transmission power on the second uplink carrier = the transmission power one on the first uplink carrier (the first uplink carrier interference noise power - the second uplink carrier interference noise power). The values of the left parameter of the above formula are obtained by S101 and S102 respectively, and then the value of the right parameter, that is, the initial transmission power of the second uplink carrier, can be obtained by using the formula.

 In this embodiment or some other embodiments of the present invention, preferably, for obtaining ((I_N)_1 - (Ι_Ν)_2),

The obtaining the interference noise power difference may include: Acquiring the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier according to the system information block SIB7 in the network broadcast message;

 And obtaining, according to a difference between the interference power of the first uplink carrier and the second uplink carrier, the interference noise power difference.

 SIB7 (System Information Block type 7) in the system broadcast message describes the level of uplink interference level. The uplink interference level included in SIB 7 in the existing protocol is used for the initial power level of the Preamble during the PRACH (Physical Random Access CHannel) process. setting. The SIB 7 information includes the uplink interference level UL interference (value-ll (T-70dBm) information, so the UE can obtain the interference noise power of the first uplink carrier and the interference noise power of the second uplink carrier by using the SIB7 to obtain the two. The difference.

 Of course, the above only enumerates a way of obtaining ((I_N)_1 - (I_N)_2). In some embodiments of the present invention, ((I_N) _1 - (I_N)_2) can also be obtained by other means, for example The obtaining the interference noise power difference may include:

 The interference noise power difference value is obtained by receiving the interference noise power difference value sent by the network side.

 S104. Perform power control on the power on the second uplink carrier when switching from the first uplink carrier to the second uplink carrier according to the initial transmit power. Setting the initial transmit power on the second uplink carrier to the initial transmit power obtained in S103 when the first uplink carrier is switched to the second uplink, so that the UE is switched to the second uplink. After the carrier, it can quickly enter the power peer.

 In this embodiment, the initial transmit power on the second uplink carrier is obtained by acquiring the transmit power on the first uplink carrier and obtaining the interference noise power difference between the first uplink carrier and the second uplink carrier, so that when the UE is from the first uplink When the carrier is switched to the second uplink carrier, the power on the second uplink carrier can be set according to the initial transmit power, so that the UE can quickly enter the power peer after switching to the second uplink carrier, which is beneficial to implementing the load. Balance. Embodiment 2

FIG. 3 is a flowchart of a method according to Embodiment 2 of the present invention. This embodiment is based on the first embodiment, except that the path loss difference (PL_1_PL_2) is ignored in the first embodiment, and in this embodiment, in order to obtain more The accurate initial transmission power of the second uplink carrier, the path loss difference is not ignored, but is sent to the UE as a constant by the network side. That is, the method described in the first embodiment may further include:

 Before performing power control on the power on the second uplink carrier when switching from the first uplink carrier to the second uplink carrier according to the initial transmit power:

 5105. Obtain a power correction amount, where the power correction amount is determined according to a path loss difference between the first uplink carrier and the second uplink carrier.

 5106. Correct the initial transmit power according to the power correction amount.

 The formula finally obtained in the first embodiment S103, when considering the path loss difference between the uplink carriers, is DPCCH_power_2 = DPCCH_power_l-((I_N)_1_(I_N)_2) - (PL-1-PL-2)

 = DPCCH_ power_l - ( (I_N) _1 - (I_N) _2 ) + Constant_Value where ( (I_N) _1 - (I_N)_2) is the difference between the interference power dBm value on the first uplink carrier and the second uplink carrier Constant_Value is the power correction amount, which can be the constant value of the network side broadcast obtained by the UE.

 Other steps that are the same as those in the first embodiment will not be described again. For details, refer to the description of the first embodiment.

 In this embodiment, the initial transmit power on the second uplink carrier is obtained by acquiring the transmit power on the first uplink carrier and obtaining the interference noise power difference between the first uplink carrier and the second uplink carrier, and correcting the initial transmit power. , making it more accurate, so that when the UE switches from the first uplink carrier to the second uplink carrier, the power on the second uplink carrier can be set according to the initial transmit power, so that the UE is switched to the second uplink carrier. After being able to quickly enter the power peer, it is beneficial to achieve load balance.

 Embodiment 3

 4 is a schematic diagram of a third embodiment of the present invention. The embodiment corresponds to the foregoing method embodiment, and provides a power control apparatus 400, configured to perform uplink carrier switching of the user equipment UE, where the apparatus 400 includes:

The first uplink carrier transmit power acquiring unit 401 is configured to acquire the transmit function on the first uplink carrier The interference noise power difference obtaining unit 402 is configured to obtain an interference noise power difference, where the interference noise power difference is a difference between the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier. ;

 The second uplink carrier initial transmission power acquiring unit 403 is configured to obtain an initial transmit power on the second uplink carrier by using a difference between a transmit power of the first uplink carrier and the interference noise power difference;

 The second uplink carrier power control unit 404 is configured to perform power control on the power on the second uplink carrier when switching from the first uplink carrier to the second uplink carrier according to the initial transmit power.

 Preferably, the transmit power on the first uplink carrier includes:

 Transmit power on the last time slot of the first uplink carrier, or

 The average value of the transmission power on the last subframe of the first uplink carrier.

 Preferably, the interference noise power difference obtaining unit 402 includes:

 An interference noise power acquisition subunit 4021, configured to broadcast a system information block according to a network broadcast message

Obtaining, by the SIB7, the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier;

 The interference noise power difference obtaining sub-unit 4022 is configured to obtain the interference noise power difference according to the difference between the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier.

 Preferably, the interference noise power difference obtaining unit 402 is configured to acquire the interference noise power difference value by receiving the interference noise power difference value sent by the network side.

 Preferably, the device 400 further includes:

 a power correction amount obtaining unit, configured to obtain a power correction amount, where the power correction amount is determined according to a path loss difference between the first uplink carrier and the second uplink carrier;

 a power correction unit, configured to correct the initial transmit power according to the power correction amount before triggering the second uplink carrier power control unit

For the device embodiment, since it basically corresponds to the method embodiment, reference may be made to the partial description of the method embodiment. The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate. The components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

 In this embodiment, the initial transmit power on the second uplink carrier is obtained by acquiring the transmit power on the first uplink carrier and obtaining the interference noise power difference between the first uplink carrier and the second uplink carrier, so that when the UE is from the first uplink When the carrier is switched to the second uplink carrier, the power on the second uplink carrier can be set according to the initial transmit power, so that the UE can quickly enter the power peer after switching to the second uplink carrier, which is beneficial to implementing the load. Balance. The invention may be described in the general context of computer-executable instructions executed by a computer, such as a program module. Generally, program modules include routines, programs, objects, components, data structures, and the like that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are connected through a communication network. In a distributed computing environment, program modules can be located in both local and remote computer storage media including storage devices.

 A person skilled in the art can understand that all or part of the steps of implementing the foregoing method embodiments can be completed by a program instructing related hardware, and the program can be stored in a computer readable storage medium, which is referred to herein. Storage media, such as: ROM, RAM, disk, CD, etc.

It should also be noted that, in this context, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations. There is any such actual relationship or order between them. Furthermore, the terms "comprising", "comprising" or "comprising" or "comprising" or "comprising" or "the" Other elements, or elements that are inherent to such a process, method, item, or device. An element defined by the phrase "comprising a ..." does not exclude the presence of additional elements in the process, method, item, or device that comprises the element. The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. The principles and embodiments of the present invention have been described in detail herein. The description of the above embodiments is only for the purpose of understanding the method of the present invention and the core idea thereof. At the same time, for those of ordinary skill in the art, The idea of the invention will vary in the specific embodiments and applications. In summary, the content of the specification should not be construed as limiting the invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Rights request 1. A power control method for uplink carrier switching of user equipment UE, characterized in that the method includes: Get the transmit power on the first uplink carrier, and, Obtain an interference noise power difference, where the interference noise power difference is the difference between the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier; Obtain the initial transmit power on the second uplink carrier by calculating the difference between the transmit power on the first uplink carrier and the interference noise power difference; According to the initial transmission power, the power on the second uplink carrier is power controlled when switching from the first uplink carrier to the second uplink carrier. 2. The method according to claim 1, characterized in that the transmit power on the first uplink carrier includes: The transmit power on the last time slot of the first uplink carrier, or, The average value of the transmit power on the last subframe of the first uplink carrier. 3. The method according to claim 1, characterized in that said obtaining the interference noise power difference includes: Obtain the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier according to the system information block SIB7 in the network broadcast message; The interference noise power difference is obtained according to the difference between the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier. 4. The method according to claim 1, characterized in that, obtaining the interference noise power difference includes: The interference noise power difference is obtained by receiving the interference noise power difference sent by the network side. 5. The method according to claim 1, characterized in that, the method further comprises: according to the initial transmit power, when switching from the first uplink carrier to the second uplink carrier, Before power control is performed on the power on the second uplink carrier: Obtain a power correction amount, which is determined based on the path loss difference between the first uplink carrier and the second uplink carrier; The initial transmission power is corrected according to the power correction amount. 6. A power control device for uplink carrier switching of user equipment UE, characterized in that the device includes: The first uplink carrier transmit power acquisition unit is used to acquire the transmit power on the first uplink carrier; the interference noise power difference acquisition unit is used to acquire the interference noise power difference, and the interference noise power difference is the first The difference between the interference noise power on the uplink carrier and the interference noise power on the second uplink carrier; The second uplink carrier initial transmit power acquisition unit is configured to obtain the initial transmit power on the second uplink carrier by calculating the difference between the transmit power on the first uplink carrier and the interference noise power difference; A second uplink carrier power control unit configured to perform power control on the second uplink carrier when switching from the first uplink carrier to the second uplink carrier according to the initial transmit power. 7. The device according to claim 6, wherein the transmit power on the first uplink carrier includes: The transmit power on the last time slot of the first uplink carrier, or, The average value of the transmit power on the last subframe of the first uplink carrier. 8. The device according to claim 6, characterized in that the interference noise power difference acquisition unit includes: An interference noise power acquisition subunit, configured to acquire the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier according to the system information block SIB7 in the network broadcast message; The interference noise power difference obtaining subunit is configured to obtain the interference noise power difference according to the difference between the interference noise power on the first uplink carrier and the interference noise power on the second uplink carrier. 9. The device according to claim 6, wherein the interference noise power difference obtaining unit is configured to obtain the interference noise power difference by receiving the interference noise power difference sent by the network side. . 10. The device according to claim 6, characterized in that, the device further includes: a power correction amount acquisition unit, configured to obtain a power correction amount, the power correction amount is based on the first uplink carrier and the third The path loss difference of the two uplink carriers is determined; A power correction unit, configured to correct the initial transmit power according to the power correction amount before triggering the second uplink carrier power control unit.