WO2012142911A1 - 一种功率控制的方法和设备 - Google Patents

一种功率控制的方法和设备 Download PDF

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Publication number
WO2012142911A1
WO2012142911A1 PCT/CN2012/073430 CN2012073430W WO2012142911A1 WO 2012142911 A1 WO2012142911 A1 WO 2012142911A1 CN 2012073430 W CN2012073430 W CN 2012073430W WO 2012142911 A1 WO2012142911 A1 WO 2012142911A1
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srs
power
transmission power
srss
transmission
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French (fr)
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高雪娟
沈祖康
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for power control. Background technique
  • LTE-ACA Long Term Evolution-Advanced, Carrier Aggregation, Long Term Evolution, Carrier Aggregation
  • LTE Long Term Evolution
  • Carrier Aggregation to support a wider system bandwidth than LTE (Long Term Evolution) system, such as 100MHz
  • LTE Long Term Evolution
  • the uplink and downlink carriers can be asymmetrically configured. That is, the user may occupy N downlink carriers for downlink transmission, and occupy M uplink carriers for uplink transmission, N ⁇ ⁇ , see Figure IB.
  • the LTE-A system can support up to five carriers for aggregation.
  • the UE User Equipment, user equipment, also called user equipment
  • SC-FDMA Single Carrier-Frequency Division Multiple Access, single
  • OFDM carrier-frequency division multiple access
  • SRS Sounding Reference Symbol
  • Aperiodic SRS aperiodic SRS in LTE-A system
  • the relevant parameters of the periodic SRS transmission are UE-specific, semi-statically configured by higher layer signaling, and independently configured for each uplink carrier.
  • the parameters related to the aperiodic SRS are also UE-specific and are independently configured for each uplink carrier and are independent of the parameters of the periodic SRS.
  • 3 ⁇ 4RS,c (') mm ⁇ 3 ⁇ 4MAX,c ('), 3 ⁇ 4RS_OFFSEXc (m) + l0 log 10 (M SRS;C ) + 3 ⁇ 4_PUSCH,c U) + « c ( i) - PL C + f c (i ⁇ ⁇ [ dBm ] Its towel: P cMAX ' c ('') is the maximum transmit power of carrier c;
  • MsRS , c is the transmission bandwidth of the SRS on the carrier c, in units of resource blocks (RB, Resource Block); 3 ⁇ 4_PUSCH, (7) is the PUSCH (Physical Uplink Shared CHannel) on the carrier c.
  • the configured transmit power target value is composed of two parts of the cell-specific part configured by the upper layer - NQMINAL - PUSCH , e ( ') and the UE-specific part _ UE _ PUSCH , c U);
  • PL c is the path loss compensation value of carrier c, which is obtained by downlink carrier measurement of the upper layer configuration
  • a c (j) e ⁇ 0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 ⁇ 5 is the path loss compensation parameter of the PUSCH on the carrier c of the higher layer configuration
  • the UE when the UE simultaneously transmits multiple SRSs on multiple uplink carriers in the same symbol, there may be multiple SRS transmissions on multiple uplink carriers due to the large transmission bandwidth of the SRS.
  • the sum of the powers exceeds the maximum transmit power of the UE. There is no clear way for the UE to simultaneously transmit multiple SRSs on multiple uplink carriers.
  • a method and device for power control according to an embodiment of the present invention are configured to simultaneously transmit multiple SRSs on multiple uplink carriers in the same symbol, and the sum of transmission powers of multiple SRSs on multiple uplink carriers exceeds Power control is performed when the UE's maximum transmission power.
  • a determining module configured to determine whether a sum of transmission powers of the plurality of SRSs that are simultaneously transmitted by the user equipment UE in the same symbol is greater than a maximum transmission power of the UE, where the multiple SRSs are in different uplinks of the UE Transmission on the carrier;
  • control module configured to: when determining that a sum of transmission powers of the multiple SRSs is greater than a maximum transmit power of the UE The transmit power of the at least one SRS is reduced, so that the sum of the transmit powers of the multiple SRSs after the transmit power is reduced is not greater than the maximum transmit power of the UE.
  • the embodiment of the present invention ensures that the total transmission power of the multiple SRSs does not exceed the maximum transmission power of the UE when the multiple SRSs are transmitted at the same time, so that the UE simultaneously transmits multiple SRSs in one uplink subframe. It ensures that the base station can obtain channel state information of multiple uplink carriers in time, and improves the accuracy of uplink scheduling. DRAWINGS
  • 1A is a schematic diagram of a single spectrum system in the background art
  • 1B is a schematic diagram of a spectrum aggregation system in the background art
  • FIG. 2 is a schematic flowchart of a power control method of an SRS according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a power control device of an SRS according to an embodiment of the present invention. detailed description
  • the transmission power of at least one SRS is reduced.
  • the sum of the transmission powers of the plurality of SRSs after the transmission power is reduced is not greater than the maximum transmission power of the UE.
  • the UE can ensure that the UE can simultaneously obtain multiple uplinks in a single uplink subframe by ensuring that the sum of the transmission powers of the multiple SRSs on the multiple uplink carriers does not exceed the maximum transmission power of the UE.
  • the channel state information of the carrier improves the accuracy of the uplink scheduling.
  • the power control method of the SRS in the embodiment of the present invention includes the following steps:
  • Step 201 Determine whether a sum of transmission powers of multiple SRSs that are simultaneously transmitted by a UE in the same symbol (such as an SC-FDMA symbol) is greater than a maximum transmission power of the UE, where the multiple SRSs are in the UE Transmission on multiple different uplink carriers.
  • Step 202 When it is determined that the sum of the transmit powers of the multiple SRSs is greater than the maximum transmit power of the UE, reduce the transmit power of the at least one SRS, so that the sum of the transmit powers of the multiple SRSs after the transmit power is reduced is not greater than the The maximum transmit power of the UE.
  • the transmit power may be reduced for some or all of the plurality of SRSs, so that the sum of the transmit powers of the multiple SRSs after the transmit power is reduced does not exceed the maximum transmit power of the UE.
  • At least one SRS may be selected in multiple SRSs according to a specific rule, and only the transmission power of the selected SRS is reduced, and the transmission power of the remaining SRSs is unchanged, so as to satisfy the transmission power of multiple SRSs after reducing the transmission power. And not exceeding the maximum transmit power of the UE; for example, selecting one SRS according to a specific rule to perform power reduction; if the transmit power of the SRS is reduced to 0, the sum of the transmit powers of the multiple SRSs after the transmit power is reduced cannot be satisfied.
  • the requirement of the maximum transmit power of the UE may further reduce the power by selecting two or more SRSs among the multiple SRSs according to a specific rule, until the sum of the transmit powers of the multiple SRSs does not exceed the maximum transmit power of the UE after the power is reduced;
  • the specific rule may be a high-level configuration or a predefined SRS priority, or may select a power-reduced SRS according to a carrier priority (such as a carrier number index, such as preferentially selecting an SRS on an uplink carrier with a large carrier number).
  • a carrier priority such as a carrier number index, for example, preferentially selecting an SRS on an uplink carrier with a small carrier number
  • selecting among multiple SRSs that the UE needs to transmit At least one SRS is sent, and the other SRSs are discarded, so that the sum of the transmission powers of the SRSs selected to be transmitted does not exceed the maximum transmission power of the UE.
  • the UE In order to enable the base station to obtain the channel state of each uplink carrier in time, the UE should be prevented from abandoning the SRS on some of the uplink carriers because the sum of the transmission powers of the multiple SRSs exceeds the maximum transmission power of the UE.
  • the UE can The plurality of SRSs simultaneously transmitted by the symbol simultaneously reduce the transmission power.
  • the maximum transmit power of the UE may be equally allocated to multiple SRSs on multiple uplink carriers that the UE needs to transmit simultaneously in the last symbol of one uplink subframe, that is, the transmit power after the SRS is reduced on each uplink carrier is PCMAJ ) IK , where K is the number of SRSs simultaneously transmitted by the UE in the last symbol in subframe i; MAX (which is the maximum transmit power of the UE; 4 MAX (0 is the value of the linear domain.
  • the same value can be lowered for each SRS or different values can be lowered.
  • the same transmission power can be reduced for each SRS, and the sum of the transmission powers of the multiple SRSs exceeds the power of the maximum transmission power of the UE, and the multiple SRSs are equally distributed as the power reduction value of each SRS, that is, each uplink.
  • the transmit power after the SRS on the carrier reduces the power, where K The number of the SRS in the last symbol of the subframe i UE simultaneously transmitted; P s RS, 0 ⁇ is the same SRS transmission power within a symbol transmitted simultaneously on the uplink carrier c in subframe i; c dish ( ) is the maximum transmit power of the UE in subframe i; PsRS , e ( Z ) and ⁇ ⁇ ⁇ (0 is the value of the linear domain.
  • the UE may choose to abandon the transmission of the SRS; further, recalculate the transmission power after each remaining SRS is reduced according to the above formula. In order to ensure that the UE does not abandon any SRS transmission and to ensure the transmission performance of each SRS as much as possible, it is preferable to reduce the transmission power of the same ratio for a plurality of SRSs.
  • each time the transmission power that needs to be adjusted is reduced by one step value, and then the sum of the transmission powers of the multiple SRSs is not greater than the maximum transmission power of the UE. If yes, the adjustment is no longer performed. If not, then the reduction is performed. One step, until the sum of the transmission powers of the multiple SRSs is not greater than the maximum transmission power of the UE.
  • the step 202 specifically includes: determining, according to the sum of the transmission powers of the multiple SRSs, and the maximum transmission power of the UE, the transmission power reduction ratio value of each SRS. Then, according to the transmission power and the transmission power reduction ratio value of each SRS, the transmission power after each SRS is reduced is determined.
  • the transmission power reduction ratio value is determined according to the formula 1:
  • PsRS , c (Z ) and ⁇ ⁇ ⁇ (0 is the value of the linear domain; is the transmission power reduction ratio value of SRS on each uplink carrier transmitted simultaneously in the same symbol in subframe i; 0 ⁇ W(i) ⁇ 1.
  • the UE in Equation 1 is the same UE, that is, multiple SRSs transmitted simultaneously in the same symbol are the same UE.
  • the multiple SRS transmission power reduction ratio values are the same.
  • the UE may choose not to send the SRS; further, the UE The transmission power after each remaining SRS power reduction can be recalculated according to the above formula 1.
  • the transmission power reduction ratio value After determining the transmission power reduction ratio value, the product of the transmission power of each SRS and the power reduction ratio value, the obtained value is used as the transmission power corresponding to the SRS reduced power, that is, the transmission after the SRS is reduced in power on each uplink carrier.
  • the power is W 0 ⁇ SRS, C (0.
  • the embodiment of the present invention is not limited to the above manner, and the embodiment of the present invention is applicable to any other manner that can reduce the sum of the transmission powers of multiple SRSs after the reduction is not greater than the maximum transmission power of the UE.
  • the SRS of the embodiment of the present invention includes: an aperiodic SRS and/or a periodic SRS.
  • the last symbol in an uplink subframe there is only one SRS transmission on the same uplink carrier, that is, if the UE is on the last symbol in one uplink subframe, there is a period on the same uplink carrier.
  • the SRS with a high priority is transmitted on the uplink carrier.
  • the priority of the aperiodic SRS is higher than the periodic SRS, that is, if the UE has both periodic and aperiodic SRS on the same uplink carrier in the last symbol of one uplink subframe, then according to the aperiodic SRS on the uplink carrier.
  • the configuration transmits aperiodic SRS.
  • the SRS power control method in the embodiment of the present invention may be applied to an application scenario such as uplink intra-band carrier aggregation (Intra-band CA) and different-band carrier aggregation (Inter-band CA), and may also be applied to other support.
  • an application scenario such as uplink intra-band carrier aggregation (Intra-band CA) and different-band carrier aggregation (Inter-band CA)
  • Inter-band CA different-band carrier aggregation
  • SRSs on different uplink carriers of the same UE are simultaneously transmitted in the same subframe.
  • the downlink carrier activated by the UE is the downlink carriers 1 and 2.
  • the UE has periodic SRS transmission on the downlink carrier 1, and the aperiodic SRS transmission on the downlink carrier 2; based on the transmission of the SRS on each downlink carrier
  • the above value is converted to the linear domain, ie
  • the UE determines the proportional value W d of each SRS power reduction according to the formula 1.
  • Aperiodic SRS on downlink carrier 2 The UE simultaneously transmits the periodic SRS on the uplink carrier 1 and the aperiodic SRS on the uplink carrier 2 on the last symbol in the current uplink subframe according to the above-mentioned reduced power transmission power.
  • an embodiment of the present invention further provides a power control device for an SRS. Since the principle of solving the problem of the device is similar to the method for power control of the SRS, the implementation of the device can refer to the implementation of the method, and the method is repeated. I won't go into details here.
  • the power control device of the SRS in the embodiment of the present invention includes: a judging module 10 and a control module 20.
  • the determining module 10 is configured to determine whether a sum of transmission powers of multiple SRSs that are required to be simultaneously transmitted by the user equipment UE in the same symbol is greater than a maximum transmission power of the UE, where the multiple SRSs are different in the UE Transmission on the uplink carrier.
  • the control module 20 is configured to: when determining that the sum of the transmit powers of the multiple SRSs is greater than the maximum transmit power of the UE, reduce the transmit power of the at least one SRS, so that the sum of the transmit powers of the multiple SRSs after the transmit power is reduced is not greater than The maximum transmit power of the UE.
  • control module 20 may reduce the transmit power to some or all of the plurality of SRSs to satisfy the sum of the transmit powers of the multiple SRSs and not exceed the maximum transmit power of the UE.
  • the UE In order to enable the base station to obtain the channel state of each uplink carrier in time, the UE should be prevented from abandoning the SRS on some of the uplink carriers because the sum of the transmission powers of the multiple SRSs exceeds the maximum transmission power of the UE, preferably, in one The plurality of SRSs simultaneously transmitted by the symbol simultaneously reduce the transmission power.
  • the same value can be lowered for each SRS or different values can be lowered.
  • control module 20 reduces the transmission power of the same ratio for a plurality of SRSs.
  • the control module 20 determines a transmission power reduction ratio value of each SRS according to the sum of the transmission powers of the multiple SRSs and the maximum transmission power of the UE; and reduces the ratio according to the transmission power of each SRS and the transmission power. , determine the transmit power after each SRS reduces power.
  • control module determines the transmit power reduction ratio value according to the formula 1.
  • the power control device of the SRS in the embodiment of the present invention is a user equipment.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • computer-usable storage interfaces including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the present invention is directed to a flowchart of a method, apparatus (system), and computer program product according to an embodiment of the present invention. And / or block diagram to describe. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG.
  • These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the method can ensure that the sum of the transmission powers of the multiple SRSs on the multiple uplink carriers does not exceed the maximum transmit power of the UE, so that the UE simultaneously transmits multiple SRSs in one uplink subframe, which ensures that the base station can obtain multiple times in time.
  • the channel state information of the uplink carriers improves the accuracy of the uplink scheduling.

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Abstract

本发明实施例涉及无线通信技术领域，特别涉及一种功率控制的方法和设备，用以在同一个符号内同时传输多个上行载波上的多个SRS，且多个上行载波上的多个SRS的发送功率之和超过UE的最大发送功率时进行功率控制。本发明实施例提供的方法包括：当需要在同一个符号内同时传输的多个SRS的发送功率之和大于UE的最大发送功率时，降低至少一个SRS的发送功率，使得降低发送功率后多个SRS的发送功率之和不大于UE的最大发送功率。本发明实施例通过对SRS发送功率的合理降低，保证了多个SRS的发送功率之和不超过UE的最大发送功率，保证了基站能够及时获得多个上行载波的信道状态信息，提高了上行调度的准确性。

Description

一种功率控制的方法和设备 本申请要求在 2011年 4月 22日提交中国专利局、 申请号为 201110102214.6、 发明名称 为"一种功率控制的方法和设备 "的中国专利申请的优先权， 其全部内容通过引用结合在本 申请中。 技术领域
本发明涉及无线通信技术领域， 特别涉及一种功率控制的方法和设备。 背景技术
对于 LTE- A C A ( Long Term Evolution-Advanced , Carrier Aggregation , 长期演进升级 , 载波聚合） 系统， 为支持比 LTE ( Long Term Evolution, 长期演进） 系统更宽的系统带宽， 比如 100MHz, —种可能是直接分配 100M带宽的频谱参见图 1A, —种可能是将分配给现 有的系统一些频谱聚合起来， 凑成大带宽供给长期演进多载波系统使用， 此时系统中上行 载波和下行载波可以不对称配置， 即用户可能会占用 N个下行载波进行下行传输， 占用 M 个上行载波进行上行传输， N≠ Μ , 参见图 IB。
目前， LTE-A系统最多可支持 5个载波进行聚合， UE ( User Equipment, 用户设备， 也称用户终端）在一个上行子帧中的最后一个 SC-FDMA ( Single Carrier-Frequency Division Multiple Access , 单载波-频分多址接入）符号中可能在多个上行载波同时存在多个 SRS ( Sounding Reference Symbol , 探参考信号）传输， LTE-A系统中支持周期 SRS ( Periodic SRS )和非周期 SRS ( Aperiodic SRS )两种传输。 周期 SRS传输的相关参数为 UE专属的， 由高层信令半静态配置， 且对每个上行载波独立配置。 非周期 SRS的相关参数也为 UE专 属的， 对每个上行载波独立配置， 且与周期 SRS的参数独立。
LTE-A系统中计算每个上行载波上的 SRS的发送功率的公式如下：
¾RS,c (') = mm { ¾MAX,c ('), ¾RS_OFFSEXc (m) + l0 log10 (MSRS;C ) + ¾_PUSCH,c U) + «c ( i) - PLC + fc (i ) } [dBm] 其巾： PcMAX'c ('')是载波 c的最大发射功率；
¾RS_OFFSET,c (^)为高层配置的 SRS功率偏移量参数，对周期 SRS和非周期 SRS独立配 置； m=0对应周期 SRS的功率偏移量， m=l对应非周期 SRS的功率偏移量；
MsRS，c为载波 c上 SRS的传输带宽， 以资源块（RB , Resource Block ) 为单位； ¾_PUSCH, (7)为载波 c上对 PUSCH ( Physical Uplink Shared CHannel , 物理上行共享信 道） 配置的发射功率目标值， 由高层配置的小区专属部分 -NQMINAL-PUSCH，e( ')和 UE专属 部分 _UE_PUSCH，c U)两部分相加构成；
PLc为载波 c的路径损耗补偿值， 通过高层配置的下行载波测量得到；
ac(j) e {0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1} 5 为高层配置的载波 c上的 PUSCH的路径损耗 补偿参数；
为载波 C上的 PUSCH的在当前上行子帧的功率控制调整量； 如果当前上行子帧 中无 PUSCH传输， 则 为该载波 c上最近一次 PUSCH的功率控制调整量。
在 LTE-A CA系统中，当 UE在同一个符号内同时传输多个上行载波上的多个 SRS时， 由于 SRS的传输带宽较大， 有可能出现多个上行载波上的多个 SRS的发送功率之和超过 UE的最大发送功率， 此时 UE如何在多个上行载波上同时发送多个 SRS还没有明确的方 法。
综上所述， 目前 UE在同一个符号内同时传输多个上行载波上的多个 SRS时， 如果出 现多个上行载波上的多个 SRS的发送功率之和超过 UE的最大发送功率时， 还没有一种进 行功率控制的方法。 发明内容
本发明实施例提供的一种功率控制的方法和设备， 用以在同一个符号内同时传输多个 上行载波上的多个 SRS , 且多个上行载波上的多个 SRS的发送功率之和超过 UE的最大发 送功率时进行功率控制。
本发明实施例提供的一种 SRS的功率控制方法， 包括：
判断一个用户设备 UE需要在同一个符号内同时传输的多个 SRS的发送功率之和是否 大于所述 UE的最大发送功率， 其中所述多个 SRS在所述 UE的不同上行载波上传输； 当确定所述多个 SRS的发送功率之和大于所述 UE的最大发送功率时， 降低至少一个 SRS的发送功率， 使得降低发送功率后多个 SRS的发送功率之和不大于所述 UE的最大发 送功率。
本发明实施例提供的一种 SRS的功率控制设备， 包括：
判断模块， 用于判断一个用户设备 UE需要在同一个符号内同时传输的多个 SRS的发 送功率之和是否大于所述 UE的最大发送功率， 其中所述多个 SRS在所述 UE的不同上行 载波上传输；
控制模块， 用于当确定所述多个 SRS 的发送功率之和大于所述 UE 的最大发送功率 时， 降低至少一个 SRS的发送功率， 使得降低发送功率后多个 SRS的发送功率之和不大 于所述 UE的最大发送功率。
本发明实施例在尽可能不放弃任何 SRS传输的基础上， 保证多个 SRS同时传输时总 的发送功率不超过 UE 的最大发送功率， 从而实现 UE在一个上行子帧中同时传输多个 SRS , 保证了基站能够及时获得多个上行载波的信道状态信息， 提高了上行调度的准确性。 附图说明
图 1A为背景技术中单频谱系统示意图；
图 1B为背景技术中频谱聚合系统示意图；
图 2为本发明实施例 SRS的功率控制方法流程示意图；
图 3为本发明实施例 SRS的功率控制设备结构示意图。 具体实施方式
本发明实施例当一个 UE在同一个符号 （即一个上行子帧中的最后一个符号） 同时传 输的多个 SRS的发送功率之和大于 UE的最大发送功率时， 降低至少一个 SRS的发送功 率， 使得降低发送功率后多个 SRS的发送功率之和不大于 UE的最大发送功率。 由于能够 保证多个上行载波上的多个 SRS的发送功率之和不超过 UE的最大发送功率， 从而实现了 UE在一个上行子帧中同时传输多个 SRS , 保证了基站能够及时获得多个上行载波的信道 状态信息， 提高了上行调度的准确性。
下面结合说明书附图对本发明实施例作进一步详细描述。
如图 2所示， 本发明实施例 SRS的功率控制方法包括下列步骤：
步骤 201、 判断一个 UE需要在同一个符号 （比如 SC-FDMA符号） 内同时传输的多 个 SRS的发送功率之和是否大于所述 UE的最大发送功率， 其中所述多个 SRS在所述 UE 的多个不同的上行载波上传输。
步骤 202、 当确定所述多个 SRS的发送功率之和大于所述 UE的最大发送功率时， 降 低至少一个 SRS的发送功率， 使得降低发送功率后多个 SRS的发送功率之和不大于所述 UE的最大发送功率。
具体的， 步骤 202中可以对多个 SRS中的部分或全部 SRS降低发送功率， 以满足降 低发送功率后多个 SRS的发送功率之和不超过 UE的最大发送功率。
比如， 可以根据特定的规则在多个 SRS中选择至少一个 SRS , 只降低选择的 SRS的 发送功率， 其余的 SRS的发送功率不变， 以满足降低发送功率后多个 SRS的发送功率之 和不超过 UE的最大发送功率； 例如， 根据特定的规则选择 1个 SRS进行功率降低， 如果 该 SRS的发送功率降低为 0时仍无法满足降低发送功率后多个 SRS的发送功率之和不大 于 UE的最大发送功率的要求， 还可以进一步根据特定规则在多个 SRS中选择 2个或更多 SRS降低功率， 直到降低功率后多个 SRS的发送功率之和不超过 UE的最大发送功率； 其 中特定的规则可以是高层配置或者预先定义的 SRS优先级， 或根据载波优先级（如载波编 号 index, 例如优先选择载波编号大的上行载波上的 SRS )选择进行功率降低的 SRS。
又比如， 可以根据高层配置或者预先定义的 SRS优先级， 或根据载波优先级（如载波 编号 index, 例如优先选择载波编号小的上行载波上的 SRS ), 在 UE需要发送的多个 SRS 中选择至少一个 SRS发送， 放弃发送其他 SRS, 以满足被选中发送的 SRS的发送功率之 和不超过 UE的最大发送功率。
为了使基站及时获得每个上行载波的信道状态， 应避免 UE由于多个 SRS的发送功率 之和超过 UE最大发送功率而放弃发送其中的部分上行载波上的 SRS, 较佳地， 可以对在 一个符号同时发送的多个 SRS同时降低发送功率。
比如， 可以将 UE最大发送功率平均分配给 UE需要在一个上行子帧的最后一个符号 同时传输的多个上行载波上的多个 SRS,即每个上行载波上的 SRS降低功率后的发送功率 为 PCMAJ ) I K , 其中 K为 UE在子帧 i中的最后一个符号同时传输的 SRS的个数； MAX( 为 UE的最大发送功率； 4MAX(0为线性域的值。
进一步， 在降低多个 SRS的发送功率时， 可以每个 SRS降低相同的值也可以降低不 同的值。
比如，可以对每个 SRS降低相同的发送功率，将多个 SRS的发送功率之和超出 UE最 大发送功率部分的功率， 在多个 SRS平均分配作为每个 SRS的功率降低值， 即每个上行
载波上的 SRS降低功率后的发送功率为 , 其中 K
Figure imgf000006_0001
为 UE在子帧 i中的最后一个符号同时传输的 SRS的个数； PsRS， 0为 ^在子帧 i中同一 个符号内同时传输的上行载波 c上的 SRS的发送功率； c皿 ( )为 UE在子帧 i中的最大 发送功率； PsRS，e(Z)和^ ΜΑχ(0为线性域的值。 进一步， 如果一个上行载波上的 SRS的降 低功率后的发送功率接近为 0, 则 UE可选择放弃该 SRS的发送； 进一步， 根据上述公式 重新计算剩余每个 SRS降低功率后的发送功率。 为了保证 UE不放弃任一个 SRS传输，并且尽可能保证每个 SRS的传输性能，较佳地， 对多个 SRS降低相同比例的发送功率。
比如可以每次分别在需要调整的发送功率减少一个步长值，然后查看多个 SRS的发送 功率之和是否不大于 UE的最大发送功率， 如果是， 则不再调整， 如果不是， 则再减少一 个步长， 直到多个 SRS的发送功率之和不大于 UE的最大发送功率。
较佳地， 当对多个 SRS降低相同比例的发送功率时， 步骤 202中具体包括： 根据多个 SRS的发送功率之和， 和 UE的最大发送功率， 确定每个 SRS的发送功率降低比例值； 然 后根据每个 SRS的发送功率和发送功率降低比例值， 确定每个 SRS降低功率后的发送功 率。
较佳地， 根据公式一确定发送功率降低比例值：
Figure imgf000007_0001
C 其中， c为载波编号， i为子帧编号， SRS， ;为子帧 i中 UE在同一个符号内同时传输 的每个上行载波上的 SRS 的发送功率； 4ΜΑχ(0为子帧 i 中 UE 的最大发送功率；
PsRS，c (Z)和^ ΜΑχ(0为线性域的值； 为子帧 i 中在同一个符号内同时传输的每个上 行载波上 SRS的发送功率降低比例值； 0≤ W(i)≤ 1。其中公式一中的 UE为同一个 UE, 即同一个符号中同时传输的多个 SRS为同一个 UE的。
较佳地， 对多个 SRS发送功率降低比例值都相同， 当一个 SRS降低功率后的发送功 率较低时（例如低于特定门限或接近 0 ), UE可选择不发送该 SRS; 进一步， UE可根据上 述公式一重新计算剩余每个 SRS降低功率后的发送功率。
在确定了发送功率降低比例值后， 每个 SRS 的发送功率与功率降低比例值的乘积， 得到的值作为对应 SRS降低功率后的发送功率， 即每个上行载波上的 SRS降低功率后的 发送功率为 W0 ^SRS,C(0。
需要说明的是， 本发明实施例并不局限于上述方式， 只要能够使降低后多个 SRS的发 送功率之和不大于 UE的最大发送功率的其他方式都适用本发明实施例。
本发明实施例的 SRS包括： 非周期 SRS和 /或周期 SRS。
较佳地， 在一个上行子帧中的最后一个符号上， 同一上行载波上只存在一种 SRS 传 输， 即如果 UE在一个上行子帧中的最后一个符号上， 在同一上行载波上同时存在周期和 非周期 SRS, 则在该上行载波上只传输优先级高的 SRS。
比如非周期 SRS的优先级高于周期 SRS, 即如果 UE在一个上行子帧中的最后一个符 号上， 在同一上行载波上同时存在周期和非周期 SRS, 则在该上行载波上根据非周期 SRS 的配置传输非周期 SRS。
需要说明的是， 本发明实施例的 SRS 功率控制方法可以应用于上行同频带载波聚合 ( Intra-band CA )、 不同频带载波聚合（ Inter-band CA)等应用场景， 当然也可以应用于其 他支持同一个 UE的不同上行载波上的 SRS在同一个子帧中同时传输的场景。
下面列举一个实施例：
UE激活的下行载波为下行载波 1和 2, 在当前上行子帧中， UE在下行载波 1上存在 周期 SRS传输， 在下行载波 2上存在非周期 SRS传输； 基于每个下行载波上 SRS的传输 配置参数和功率配置参数， 根据背景技术中的公式计算得到下行载波 1上的周期 SRS的发 送功率为 jPSRS，I(0 = 20 (dBm) , 下行载波上的非周期 SRS 的发送功率为 PSRS,2(0 = 22(dBm)。 假设 UE 允许的最大发送功率为 PCMAX( )=23(dBm), 将上述值转换到线性域， 即
ARS ,() = io¾si/1° = ιο20/1° = loo ^ 、
SRS'1 ' * 瓦 （ mw ) ,
Figure imgf000008_0001
(/) = 10 ^皿 （')/10 = 199.526(mw), 则
4RS,I( + 4RS,2( = 100 + 158.489 = 258.489 > MAX( = 199.526 , 说明 UE在当前 上行子帧同时发送 2个 SRS的总功率超过了 UE允许的最大发送功率， 需要对 SRS降低功
UE 根 据 公 式 一 确 定 每 个 SRS 功 率 降 低 的 比 例 值 Wd
∑^( x¾c( =w(z) x ( SR¾1 () + SR¾2 ())≤ MAX( ；
c 即 w(/) =077189, 取 w( )=07 则可以进一步计
Figure imgf000008_0002
算出 UE 在当前上行子帧中下行载波 1 上的周期 SRS 降低功率后的实际发送功率为 w( - RS,I (/') = 0.77 X 100 = 77 (mw) , UE在当前上行子帧中下行载波 2上的非周期 SRS
Figure imgf000008_0003
UE按照上述降低功率后的发送功率， 在当前上行子帧中的最后一个符号上同时发送 上行载波 1上的周期 SRS和上行载波 2上的非周期 SRS。
基于同一发明构思， 本发明实施例中还提供了一种 SRS 的功率控制设备， 由于该设 备解决问题的原理与 SRS 的功率控制的方法相似， 因此该设备的实施可以参见方法的实 施， 重复之处不再赘述。
如图 3所示， 本发明实施例 SRS的功率控制设备包括： 判断模块 10和控制模块 20。 判断模块 10, 用于判断一个用户设备 UE需要在同一个符号内同时传输的多个 SRS的 发送功率之和是否大于所述 UE的最大发送功率， 其中所述多个 SRS在所述 UE的不同上 行载波上传输。
控制模块 20, 用于当确定所述多个 SRS的发送功率之和大于所述 UE的最大发送功 率， 降低至少一个 SRS的发送功率， 使得降低发送功率后多个 SRS的发送功率之和不大 于所述 UE的最大发送功率。
具体的， 控制模块 20可以对多个 SRS中的部分或全部 SRS降低发送功率， 以满足多 个 SRS的发送功率之和不超过 UE的最大发送功率。
为了使基站及时获得每个上行载波的信道状态， 应避免 UE由于多个 SRS的发送功率 之和超过 UE最大发送功率而放弃发送其中的部分上行载波上的 SRS , 较佳地， 可以对在 一个符号同时发送的多个 SRS同时降低发送功率。
进一步， 在降低多个 SRS的发送功率时， 可以每个 SRS降低相同的值也可以降低不 同的值。
较佳地， 控制模块 20对多个 SRS降低相同比例的发送功率。
较佳地， 控制模块 20根据多个 SRS的发送功率之和， 和 UE的最大发送功率， 确定 每个 SRS 的发送功率降低比例值； 根据每个 SRS 的发送功率和所述发送功率降低比例 值， 确定每个 SRS降低功率后的发送功率。
较佳地， 控制模块根据公式一确定所述发送功率降低比例值。
较佳地， 本发明实施例的 SRS的功率控制设备是用户设备。
本领域内的技术人员应明白， 本发明的实施例可提供为方法、 系统、 或计算机程序产 品。 因此， 本发明可釆用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实 施例的形式。 而且， 本发明可釆用在一个或多个其中包含有计算机可用程序代码的计算机 可用存储介盾 （包括但不限于磁盘存储器、 CD-ROM、 光学存储器等）上实施的计算机程 序产品的形式。
本发明是参照根据本发明实施例的方法、 设备（系统）、 和计算机程序产品的流程图 和 /或方框图来描述的。 应理解可由计算机程序指令实现流程图和 /或方框图中的每一流 程和 /或方框、 以及流程图和 /或方框图中的流程和 /或方框的结合。 可提供这些计算机 程序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器 以产生一个机器， 使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用 于实现在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的 装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方 式工作的计算机可读存储器中， 使得存储在该计算机可读存储器中的指令产生包括指令装 置的制造品， 该指令装置实现在流程图一个流程或多个流程和 /或方框图一个方框或多个 方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上， 使得在计算机 或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理， 从而在计算机或其他 可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和 /或方框图一个 方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例， 但本领域内的技术人员一旦得知了基本创造性概 念， 则可对这些实施例作出另外的变更和修改。 所以， 所附权利要求意欲解释为包括优选 实施例以及落入本发明范围的所有变更和修改。
由于能够保证多个上行载波上的多个 SRS 的发送功率之和不超过 UE 的最大发送功 率， 从， 从而实现了 UE在一个上行子帧中同时传输多个 SRS , 保证了基站能够及时获得 多个上行载波的信道状态信息， 提高了上行调度的准确性。
显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和 范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种探测参考信号 SRS的功率控制方法， 其特征在于， 该方法包括：
判断一个用户设备 UE需要在同一个符号内同时传输的多个 SRS的发送功率之和是否 大于所述 UE的最大发送功率， 其中所述多个 SRS在所述 UE的不同上行载波上传输； 当确定所述多个 SRS的发送功率之和大于所述 UE的最大发送功率时， 降低至少一个
SRS的发送功率， 使得降低发送功率后多个 SRS的发送功率之和不大于所述 UE的最大发 送功率。
2、 如权利要求 1所述的方法， 其特征在于， 所述降低至少一个 SRS的发送功率， 包 括：
对所述多个 SRS降低相同比例的发送功率。
3、 如权利要求 2所述的方法， 其特征在于， 对所述多个 SRS降低相同比例的发送功 率， 包括：
根据所述多个 SRS的发送功率之和，和所述 UE的最大发送功率，确定每个 SRS的发 送功率降低比例值；
根据每个 SRS的发送功率和所述发送功率降低比例值， 确定每个 SRS降低功率后的 发送功率。
4、 如权利要求 3 所述的方法， 其特征在于， 根据下列公式确定所述发送功率降低比 例值：
Figure imgf000011_0001
C 其中， c为载波编号， i为子帧编号， ^^、"为子帧 中所述！^在同一个符号内同时 传输的上行载波 c上的 SRS的发送功率； 4ΜΑχ(0为子帧 i中所述 UE的最大发送功率；
PsRS，e (Z)和^ ΜΑχ(0为线性域的值； 为子帧 i中所述 UE在同一个符号内同时传输的 每个上行载波上 SRS的发送功率降低比例值。
5、 如权利要求 1 ~ 4任一所述的方法， 其特征在于， 所述 SRS包括： 非周期 SRS和 / 或周期 SRS。
6、 一种 SRS的功率控制设备， 其特征在于， 该设备包括：
判断模块， 用于判断一个用户设备 UE需要在同一个符号内同时传输的多个 SRS的发 送功率之和是否大于所述 UE的最大发送功率， 其中所述多个 SRS在所述 UE的不同上行 载波上传输；
控制模块， 用于当确定所述多个 SRS 的发送功率之和大于所述 UE 的最大发送功率 时， 降低至少一个 SRS的发送功率， 使得降低发送功率后多个 SRS的发送功率之和不大 于所述 UE的最大发送功率。
7、 如权利要求 6所述的设备， 其特征在于， 所述控制模块具体用于：
对所述多个 SRS降低相同比例的发送功率。
8、 如权利要求 7所述的设备， 其特征在于， 所述控制模块具体用于：
根据所述多个 SRS的发送功率之和，和所述 UE的最大发送功率，确定每个 SRS的发 送功率降低比例值； 根据每个 SRS的发送功率和所述发送功率降低比例值， 确定每个 SRS 降低功率后的发送功率。
9、 如权利要求 8 所述的设备， 其特征在于， 所述控制模块根据下列公式确定所述发 送功率降低比例值：
Figure imgf000012_0001
c 其中， sRS，A"为子帧 i中所述 ^在同一个符号内同时传输的每个上行载波上的 SRS 的发送功率； MAX(0为子帧 i中所述 UE的最大发送功率； PsRS，e (Z)和 4ΜΑχ(0为线性 域的值； 为子帧 i中所述 UE在同一个符号内同时传输的每个上行载波上 SRS的发 送功率降低比例值。
10、 一种用户设备， 其特征在于， 该用户设备包括权利要求 6-9中任一所述的 SRS的 功率控制设备。
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CN102300305B (zh) * 2011-09-23 2013-09-04 电信科学技术研究院 一种上行功率控制的方法及装置
CN102348269B (zh) * 2011-09-27 2015-01-28 电信科学技术研究院 一种上行功率控制的方法和设备
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