WO2016077998A1 - 信号传输方法和装置 - Google Patents

信号传输方法和装置 Download PDF

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Publication number
WO2016077998A1
WO2016077998A1 PCT/CN2014/091470 CN2014091470W WO2016077998A1 WO 2016077998 A1 WO2016077998 A1 WO 2016077998A1 CN 2014091470 W CN2014091470 W CN 2014091470W WO 2016077998 A1 WO2016077998 A1 WO 2016077998A1
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srs
power
cell group
transmit
subframe
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PCT/CN2014/091470
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English (en)
French (fr)
Inventor
范霄安
贺传峰
邵家枫
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华为技术有限公司
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Priority to PCT/CN2014/091470 priority Critical patent/WO2016077998A1/zh
Priority to CN201480023352.7A priority patent/CN106171017B/zh
Publication of WO2016077998A1 publication Critical patent/WO2016077998A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink

Definitions

  • the embodiments of the present invention relate to the field of wireless communications technologies, and in particular, to a signal transmission method and apparatus.
  • CA Carrier Aggregation
  • the CA technology is a technique of aggregating the spectrum of at least two carriers.
  • the spectrum of each component carrier in the CA technology may be an adjacent continuous spectrum, or may be a non-adjacent spectrum in the same frequency band or even a discontinuous spectrum in different frequency bands.
  • the UE (User Equipment) in the LTE-A (Long Term Evolution-Advanced) system can use multiple component carriers to transmit or receive data according to its capabilities and service requirements.
  • a technique for aggregating carriers using multiple base stations (eg, one UE can connect two base stations, also known as dual connectivity).
  • the downlink transmission times of the downlink channels of the two base stations are not synchronized, as shown in FIG. 1, the downlink transmission times of the cells Cell1 and Cell2 are not synchronized, and the uplink transmission times of Cell1 and Cell2 are not synchronized, so that Cell1 is Subframe i corresponding to the uplink channel (subframe numbered i) subframe j corresponding to the uplink channel of cell Cell2 (subframe numbered j) and subframe j+1 (subframe numbered j+1) It is overlapping.
  • Cell1 and Cell2 belong to cells of different base stations or cell groups, respectively.
  • the UE When determining the channel power of one subframe (set to subframe i), the UE needs to consider the uplink of two subframes (set as subframe j and subframe j+1) of the cell covered by another base station overlapping with subframe i. Power allocation of the channel. That is, the sum of the transmit powers of the multiple channels on the segment at any time cannot be exceeded beyond the maximum transmit power of the UE on the time segment. To this end, the power of the UE requires power allocation between different base stations or groups of cells. First, the UE reserves guaranteed power for each base station or group of cells. The power is guaranteed to be a semi-static power value, and the power configured by high-level signaling, such as RRC (Radio Resource Control) signaling.
  • RRC Radio Resource Control
  • the total maximum transmit power of the UE is allocated between the base station or the cell group if there is remaining power in addition to the guaranteed power reserved for each base station or group of cells.
  • the method of allocation depends on the Power Control Mode (PCM).
  • PCM1 the remaining power determines the allocation of remaining power according to the priority of Uplink Control Information (UCI) carried by the channel of the base station or the cell group.
  • UCI Uplink Control Information
  • PCM2 the remaining power is preferentially allocated to the channel of the first transmitting base station or cell group. For example, in FIG. 1, for power allocation of subframe i and subframe j+1, the remaining power of the UE is preferentially allocated to the channel of the base station or cell group in which subframe i is located.
  • the SRS power allocation has a lower priority than the other channel types.
  • the SRS will not be dropped.
  • the power required by the SRS exceeds the maximum power of the UE, the power of the SRS is compressed to meet the maximum transmit power.
  • the transmit power of the UE is allocated between two base stations or cell groups, under the existing PCM1 and PCM2, the probability that the SRS transmit power of the UE is not satisfied is greatly greater than that of the CA. The increase causes the SRS to not transmit at the appropriate power, thereby affecting the detection of the upstream channel.
  • the embodiment of the invention provides a signal transmission method and device, which ensures that when the power of the UE is limited, the SRS can be transmitted in a more reasonable manner, thereby improving the effectiveness of the uplink channel detection.
  • the first aspect provides a signal transmission method, including:
  • the user equipment UE determines a channel state of the first subframe of the first cell group
  • the UE determines not to transmit the sounding reference signal SRS;
  • the first preset condition includes: the number of SRSs to be transmitted on the first subframe is one, and the UE cannot transmit the SRS at the power required by the SRS.
  • the second aspect provides a UE, including:
  • a determining module configured to determine a channel state of the first subframe of the first cell group
  • a processing module configured to determine not to transmit the sounding reference signal SRS when determining that the channel state meets the first preset condition
  • the first preset condition includes: the number of SRSs to be transmitted on the first subframe is one, and the UE cannot transmit the SRS at the power required by the SRS.
  • the signal transmission method and apparatus provided by this embodiment determine the channel state of the first subframe of the first cell group by using the user equipment UE; and when the UE determines that the channel state meets the first preset condition, The UE determines not to transmit the sounding reference signal SRS; wherein the first preset condition comprises: the number of SRSs to be transmitted on the first subframe is one, and the UE cannot transmit the power required by the SRS
  • the SRS is described, thereby effectively avoiding the inaccuracy of the base station to the uplink channel detection caused by the power reduction SRS.
  • FIG. 1 is a schematic structural diagram of a subframe corresponding to a cell in which two uplink transmission times are not synchronized in a user equipment UE in the prior art;
  • FIG. 2 is a schematic flowchart of a signal transmission method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of another user equipment according to an embodiment of the present invention.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access Wireless
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • the user equipment which may also be called a mobile terminal, a mobile user equipment, etc., may communicate with one or more core networks via a radio access network (eg, RAN, Radio Access Network), and the user equipment may be mobile.
  • a radio access network eg, RAN, Radio Access Network
  • Terminals such as mobile telephones (or "cellular" telephones) and computers with mobile terminals, for example, can be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange languages with wireless access networks And / or data, can also be a relay.
  • the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or a base station (NodeB) in WCDMA, or an evolved base station (eNB or e-NodeB, evolutional Node B) in LTE.
  • BTS Base Transceiver Station
  • NodeB base station
  • eNB evolved base station
  • e-NodeB evolutional Node B
  • FIG. 2 is a flowchart of Embodiment 1 of a signal transmission method according to an embodiment of the present invention. As shown in FIG. 2, the method in this embodiment includes:
  • Step 201 The user equipment UE determines a channel state of a first subframe of the first cell group.
  • the first group of cells consists of one or more cells served by the base station for the UE.
  • the user equipment determines the channel status of all activated cells of the first cell group in the first subframe, including determining whether one of the following channels needs to be transmitted: a physical uplink control channel (PUCCH), physical uplink sharing Physical uplink shared channel (PUSCH), physical random access channel (PRACH), and SRS.
  • a physical uplink control channel PUCCH
  • PUSCH physical uplink sharing Physical uplink shared channel
  • PRACH physical random access channel
  • Step 202 when the UE determines that the channel state meets the first preset condition, the UE determines not to transmit the sounding reference signal SRS;
  • the first preset condition includes: the number of SRSs to be transmitted on the first subframe is one, and the UE cannot transmit the SRS at the power required by the SRS.
  • the power required by the above SRS refers to the required transmit power when the UE transmits the SRS to the base station.
  • the UE effectively avoids the inaccuracy of the base station to the uplink channel detection caused by the power reduction SRS.
  • the first preset condition may further include: the UE does not need to transmit other channels in the first subframe, and the other channels include one or more of the following channels: PUCCH, PUSCH, and PRACH.
  • the method may further include the step 203, when the UE determines that the channel state meets the second preset condition, the UE determines that the SRS needs to be power compressed until the first transmit power is met.
  • SRS For example, the compressed at least two SRSs are transmitted to the base station to which the first cell group belongs.
  • the second preset condition includes: the number of SRSs to be transmitted on the first subframe is at least two, and the UE cannot transmit the at least two SRSs at the power required by the SRS.
  • the detection of the uplink channel can be ensured by the transmission of multiple SRSs after power reduction.
  • the base station can receive the plurality of power-compressed SRSs, thereby predicting whether the power of the SRS is compressed, and based on this, obtaining more accurate phase information of the uplink channel.
  • steps 202 and 203 have no necessary sequence relationship, and the UE may selectively implement one or more functions.
  • the power required by any one of the SRSs (ie, the transmit power required by the SRS) can be obtained by the following formula:
  • P CMAX,c (i) is the maximum transmit power of the UE subframe i in the serving cell c;
  • P SRS_OFFSET, c (m) is a semi-static parameter configured by the upper layer
  • M SRS, c is the transmission bandwidth of the SRS
  • f c (i) is the power adjustment of the current PUSCH
  • P O_PUSCH,c (j) is a power offset of a PUSCH channel configured at a higher layer
  • ⁇ c (j) is the path loss compensation value.
  • the first transmit power in step 203 may include one of the following conditions:
  • the first transmit power is the maximum transmit power of the UE minus the power of the channel with a higher priority than the SRS.
  • the UE since the channel priority of the SRS is the lowest, according to the PCM 1, the UE first allocates power to channels having higher priority than the SRS, such as PUCCH and PUSCH. Therefore, the transmit power available to the SRS is the maximum transmit power of the UE minus the power of the channel with a higher priority than the SRS.
  • the channel with the higher priority than the SRS may include all the to-be-transmitted channels in the first cell group and the second cell group with higher priority than the SRS.
  • the second cell group and the first cell group are two different cell groups serving the UE.
  • the first transmit power is the maximum transmit power of the UE minus the power of the channel with a higher priority than the SRS, and then subtract the power of the SRS of the second cell group, where the second cell group and the first cell group are Two different cell groups serving the UE.
  • the transmit power of the UE is preferentially allocated to the SRS of the second cell group, and the remaining power is the available power of the SRS of the first cell group.
  • the first transmit power is the power allocated by the UE in the first cell group
  • the first transmit power may be the allocated power of the UE for the channel transmission of the first cell group in the first subframe.
  • the total power of the user equipment is allocated between two base stations or cell groups, and the available transmit power of the SRS is the power allocated by the UE to the cell group in which the SRS is located.
  • the first transmit power is the power allocated by the UE in the first cell group minus the power of the channel in which the UE has a higher priority than the SRS in the first cell group.
  • the UE when the UE transmits in a first subframe other than the SRS in the first subframe of the first cell group, since the priority of the channel of the SRS is low, the power needs to be preferentially allocated to other channels to be transmitted to the first cell group. .
  • the power compression performed by the UE in step 203 on the SRS is proportionally compressed.
  • the implementation manner of the UE performing power compression on the SRS to meet the first transmit power may be:
  • the user equipment determines the actual transmit power of the SRS according to the calculated transmit power of the SRS and the first transmit power.
  • the sum of the required transmit powers of the at least two SRSs exceeds the first transmit power
  • the channel power of the at least two SRs is compressed, and a manner of proportionally compressing the SRS power is as follows:
  • FIG. 3 is a user equipment UE, which can be used to implement all the signal transmission methods in the foregoing method embodiment. As shown in FIG. 3, the user equipment includes:
  • the determining module 301 is configured to determine a channel state of the first subframe of the first cell group.
  • the first group of cells consists of one or more cells served by the base station for the UE.
  • the user equipment determines the channel status of all activated cells of the first cell group in the first subframe, including determining whether one of the following channels needs to be transmitted: a physical uplink control channel (PUCCH), physical uplink sharing Physical uplink shared channel (PUSCH), physical random access channel (PRACH), and SRS.
  • a physical uplink control channel PUCCH
  • PUSCH physical uplink sharing Physical uplink shared channel
  • PRACH physical random access channel
  • the processing module 302 is configured to: when it is determined that the channel state meets the first preset condition, determine to not transmit the sounding reference signal SRS;
  • the first preset condition includes: the number of SRSs to be transmitted on the first subframe is one, and the UE cannot transmit the SRS at the power required by the SRS.
  • the power required by the above SRS refers to the required transmit power when the UE transmits the SRS to the base station.
  • the UE effectively avoids the inaccuracy of the base station to the uplink channel detection caused by the power reduction SRS.
  • the first preset condition may further include: the UE does not need to transmit other channels in the first subframe, and the other channels include one or more of the following channels: PUCCH, PUSCH, and PRACH.
  • the processing module 32 is further configured to: when the UE determines that the channel state meets the second preset condition, determine that the SRS needs to be power compressed until the first transmit power is satisfied, and then the SRS is transmitted;
  • the UE may further include a transmitting module 43 for transmitting the power-compressed SRS to the base station.
  • the second preset condition includes: the number of SRSs to be transmitted on the first subframe is at least two, and the UE cannot transmit the at least two SRSs at the power required by the SRS.
  • the detection of the uplink channel can be ensured by the transmission of multiple SRSs after power reduction.
  • the base station can receive the plurality of power-compressed SRSs, thereby predicting whether the power of the SRS is compressed, and based on this, obtaining more accurate phase information of the uplink channel.
  • the power required by any one of the above SRSs (ie, the transmit power required by the SRS) can be obtained by the following formula:
  • P CMAX,c (i) is the maximum transmit power of the UE subframe i in the serving cell c;
  • P SRS_OFFSET, c (m) is a semi-static parameter configured by the upper layer
  • M SRS, c is the transmission bandwidth of the SRS
  • f c (i) is the power adjustment of the current PUSCH
  • P O_PUSCH,c (j) is a power offset of a PUSCH channel configured at a higher layer
  • ⁇ c (j) is the path loss compensation value.
  • the first transmit power may include one of the following conditions:
  • the first transmit power is the maximum transmit power of the UE minus the power of the channel with a higher priority than the SRS.
  • the UE since the channel priority of the SRS is the lowest, according to the PCM 1, the UE first allocates power to a channel having a higher channel priority than the SRS, such as PUCCH and PUSCH. Therefore, the transmit power available to the SRS is the maximum transmit power of the UE minus the power of the channel with a higher priority than the SRS.
  • the channel higher than the SRS may include all the channels to be transmitted whose priority is higher than the SRS in the first cell group and the second cell group.
  • the second cell group and the first cell group are two different cell groups serving the UE.
  • the first transmit power is the maximum transmit power of the UE minus the power of the channel with a higher priority than the SRS, and then subtract the power of the SRS of the second cell group, where the second cell group and the first cell group are Two different cell groups serving the UE.
  • the transmit power of the UE is preferentially allocated to the SRS of the second cell group, and the remaining power is the available power of the SRS of the first cell group.
  • the first transmit power is the power allocated by the UE in the first cell group
  • the first transmit power may be the allocated power of the UE for the channel transmission of the first cell group in the first subframe.
  • the total power of the user equipment is allocated between two base stations or cell groups, and the available transmit power of the SRS is the power allocated by the UE to the cell group in which the SRS is located.
  • the first transmit power is the power allocated by the UE in the first cell group minus the power of the channel in which the UE has a higher priority than the SRS in the first cell group.
  • the UE when the UE transmits in a first subframe other than the SRS in the first subframe of the first cell group, since the priority of the channel of the SRS is low, the power needs to be preferentially allocated to other channels to be transmitted to the first cell group. .
  • the power compression performed on the SRS is a proportional compression.
  • the implementation manner of the processing module 32 performing power compression on the SRS to meet the first transmit power may be:
  • the processing module 32 determines the actual transmit power of the SRS according to the required transmit power of the calculated SRS and the first transmit power.
  • the sum of the required transmit powers of the at least two SRSs exceeds the first transmit power
  • the channel power of the at least two SRs is compressed, and a manner of proportionally compressing the SRS power is as follows:
  • the transmitting module 43 in the embodiment of the present invention may be implemented by a transmitter.
  • the determining module 31 and the processing module 32 are implemented by a processor of the UE, where the processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or complete the implementation.
  • the processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or complete the implementation.
  • the UE may further include a memory for storing the instruction code, the processor invoking the instruction code of the memory, and controlling the determining module 31, the processing module 32, and the transmitting module 43 in the embodiment of the present invention to perform the above operations.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Abstract

本发明实施例提供一种信号传输方法和装置，通过用户设备UE确定第一小区组的第一子帧的信道状态；并当所述UE确定所述信道状态满足第一预设条件时，则所述UE确定不发射探测参考信号SRS；其中，所述第一预设条件包括：在所述第一子帧上待发射的SRS数量为一个，且所述UE不能以所述SRS要求的功率发射所述SRS，从而有效避免了降功率发射SRS导致的基站对上行信道探测的不准确。

Description

信号传输方法和装置 技术领域
本发明实施例涉及无线通信技术领域，尤其涉及一种信号传输方法和装置。
背景技术
为了提供更宽的传输带宽，现有技术提出了CA(Carrier Aggregation，载波聚合)技术。CA技术为将至少两个载波的频谱进行聚合的技术。CA技术中的各成员载波的频谱可以是相邻的连续频谱、也可以是同一频带内的不相邻频谱甚至是不同频带内的不连续频谱。采用CA技术可以使得LTE-A(Long Term Evolution-Advanced，高级长期演进)系统中的UE(User Equipment，用户设备)根据其能力和业务需求可以同时使用多个成员载波进行数据的发射或接收。
对于利用多个基站的载波进行聚合的技术(如一个UE可以连接两个基站，又称为双连接，Dual Connectivity)。当两个基站的下行信道的发射时间(简称下行发射时间)不同步时，如图1所示，小区Cell1与Cell2的下行发射时间不同步，导致Cell1与Cell2的上行发射时间不同步，使得Cell1的上行信道对应的子帧i(编号为i的子帧)与小区Cell2的上行信道对应的子帧j(编号为j的子帧)和子帧j+1(编号为j+1的子帧)是重叠的。其中Cell1和Cell2分别属于不同基站或小区组的小区。UE在决定一个子帧(设为子帧i)的信道功率时，需要考虑与子帧i重叠的另一基站覆盖的小区的两个子帧(设为子帧j和子帧j+1)的上行信道的功率分配。即保证在任何时间片段上的多个信道的发射功率之和不能超过该时间片段上的UE的最大发射功率。为此，UE的功率需要在不同的基站或小区组之间的功率分配。首先，UE为每个基站或小区组预留保证功率，该 保证功率为一个半静态的功率值，通过高层信令，例如RRC(Radio Resource Control，无线资源控制协议)信令配置的功率。而UE的总的最大发射功率除了为每个基站或者小区组预留的保证功率之外，如果还有剩余功率，会在基站或小区组间进行分配。分配的方法取决于功率控制模式(Power Control Mode，PCM)。对于PCM1，剩余功率根据基站或者小区组的信道承载的上行控制信息(Uplink Control Information，UCI)的优先级决定剩余功率的分配。对于PCM2，剩余功率优先分配给先发射的基站或者小区组的信道。例如，在图1中，对于子帧i和子帧j+1的功率分配，UE的剩余功率优先分配给子帧i所在的基站或者小区组的信道。
对于探测参考信号(Sounding Reference Signal，SRS)的功率分配，在双连接系统中，SRS功率分配的优先级低于其他信道类型。在CA系统中，如果一个子帧只有SRS发射，则SRS不会被丢弃(drop)，当SRS要求的功率超过UE的最大功率时，SRS的功率会被压缩，以满足最大发射功率。对于双连接系统，由于UE的发射功率在两个基站或者小区组之间进行分配，在现有的PCM1和PCM2下，UE的SRS发射功率得不到满足的概率相比CA时会极大的增加，造成SRS不能以合适的功率发射，从而影响上行信道的探测。
发明内容
本发明实施例提供一种信号传输方法和装置，保证在当UE的功率受限时，SRS可以以更加合理的方式发射，从而提高上行信道探测的有效性。
第一方面提供一种信号发射方法，包括：
用户设备UE确定第一小区组的第一子帧的信道状态；
当所述UE确定所述信道状态满足第一预设条件时，则所述UE确定不发射探测参考信号SRS；
其中，所述第一预设条件包括：在所述第一子帧上待发射的SRS数量为一个，且所述UE不能以所述SRS要求的功率发射所述SRS。
第二方面提供一种UE，包括：
确定模块，用于确定第一小区组的第一子帧的信道状态；
处理模块，用于当确定所述信道状态满足第一预设条件时，则确定不发射探测参考信号SRS；
其中，所述第一预设条件包括：在所述第一子帧上待发射的SRS数量为一个，且所述UE不能以所述SRS要求的功率发射所述SRS。
本实施例提供的信号传输方法和装置，通过用户设备UE确定第一小区组的第一子帧的信道状态；并当所述UE确定所述信道状态满足第一预设条件时，则所述UE确定不发射探测参考信号SRS；其中，所述第一预设条件包括：在所述第一子帧上待发射的SRS数量为一个，且所述UE不能以所述SRS要求的功率发射所述SRS，从而有效避免了降功率发射SRS导致的基站对上行信道探测的不准确。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为现有技术中用户设备UE中两个上行发射时间不同步的小区对应的一种子帧结构示意图；
图2为本发明实施例提供的一种信号传输方法流程示意图；
图3为本发明实施例提供的一种用户设备的结构示意图；
图4为本发明实施例提供的另一种用户设备的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获 得的所有其他实施例，都属于本发明保护的范围。
以下本发明实施例的技术方案，可以应用于各种通信系统，例如：全球移动通信系统(GSM，Global System of Mobile communication)，码分多址(CDMA，Code Division Multiple Access)系统，宽带码分多址(WCDMA，Wideband Code Division Multiple Access Wireless)，通用分组无线业务(GPRS，General Packet Radio Service)，长期演进(LTE，Long Term Evolution)等。
用户设备，也可称之为移动终端(Mobile Terminal)、移动用户设备等，可以经无线接入网(例如，RAN，Radio Access Network)与一个或多个核心网进行通信，用户设备可以是移动终端，如移动电话(或称为“蜂窝”电话)和具有移动终端的计算机，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据，也可以是中继(Relay)。
基站，可以是GSM或CDMA中的基站(BTS，Base Transceiver Station)，也可以是WCDMA中的基站(NodeB)，还可以是LTE中的演进型基站(eNB或e-NodeB，evolutional Node B)，本发明并不限定。
图2为本发明实施例提供的信号传输方法实施例一的流程图，如图2所述，本实施例的方法包括：
步骤201，用户设备UE确定第一小区组的第一子帧的信道状态。
该第一小区组由一个基站下为该UE服务的一个或多个小区组成。
例如：用户设备确定第一小区组的所有激活小区在第一子帧的信道状态，包括确定是否有以下信道之一需要发射：物理上行控制信道(physical uplink control channel，简称PUCCH)、物理上行共享信道(Physical uplink shared channel，简称PUSCH)、物理随机接入信道(Physical random access channel，简称PRACH)、SRS。
步骤202，当所述UE确定该信道状态满足第一预设条件时，则UE确定不发射探测参考信号SRS；
其中，所述第一预设条件包括：在所述第一子帧上待发射的SRS数量为一个，且所述UE不能以所述SRS要求的功率发射所述SRS。
上述SRS要求的功率指UE向基站发射SRS时要求的发射功率。
这种情况下，UE有效避免了降功率发射SRS导致的基站对上行信道探测的不准确。
可选的，该第一预设条件还可以进一步包括：UE在第一子帧没有其他信道需要发射，所述其他信道包括以下信道中的一种或多种：PUCCH，PUSCH，以及PRACH。
需要说明的是，本发明实施例中的确定有没有需要发射的信道，即确定有没有需要通过这些信道(如PUCCH、PUSCH或PRACH等)发射的信息。
可选的，该方法还可以进一步包括步骤203，当所述UE确定所述信道状态满足第二预设条件时，则所述UE确定需要对SRS进行功率压缩至满足第一发射功率后发射所述SRS。例如，将压缩后的至少两个SRS发射给上述第一小区组所属的基站。
上述所述第二预设条件包括：在第一子帧上待发射的SRS数量为至少两个，且UE不能以所述SRS要求的功率发射所述至少两个的SRS。
这种情况下，可以通过降功率后的多个SRS的发射，保证上行信道的探测。此时，基站可以通过接收多个功率压缩后的SRS，从而预期SRS的功率是否被压缩，并基于此获得更为准确的上行信道的相位信息。
需要说明的是，上述步骤202和203没有必然的先后关系，UE可以有选择性的实现其中一种或多种功能。
在步骤202或203中，任意一个SRS要求的功率(即SRS要求的发射功率)可以由如下计算公式得到：
PSRS,c(i)＝min{PCMAX,c(i),PSRS_OFFSET,c(m)+10log10(MSRS,c)+PO_PUSCH,c(j)+αc(j)·PLc+fc(i)}
其中，
PCMAX,c(i)为UE子帧i在服务小区c的最大发射功率；
PSRS_OFFSET,c(m)为高层配置的半静态参数；
MSRS,c为SRS的传输带宽；
fc(i)为当前PUSCH的功率调整；
PO_PUSCH,c(j)为高层配置的PUSCH信道的功率偏置；
αc(j)为路径损耗补偿值。
步骤203中的第一发射功率可以包括以下几种情况之一：
1)第一发射功率为UE的最大发射功率减去优先级高于SRS的信道的功率。
例如，由于SRS的信道优先级最低，根据PCM1，UE先将功率分配给比SRS优先级高的信道，如PUCCH、PUSCH。因此SRS可用的发射功率为UE的最大发射功率减去优先级高于SRS的信道的功率。上述优先级高于SRS的信道可以包括第一小区组及第二小区组内所有优先级高于SRS的待发射信道。所述第二小区组和所述第一小区组是为所述UE服务的两个不同小区组。
2)第一发射功率为UE的最大发射功率减去优先级高于SRS的信道的功率，再减去第二小区组的SRS的功率，所述第二小区组和所述第一小区组是为所述UE服务的两个不同小区组。
例如，由于MCG(Master Cell Group，主小区组)的SRS优先级高于SCG(Secondary Cell Group，辅小区组)的SRS优先级，当第一小区组为SCG，第二小区组为MCG时，UE的发射功率优先分配给第二小区组的SRS，剩余的功率为第一小区组的SRS的可用功率。
3)第一发射功率为UE在所述第一小区组分配的功率；
例如，第一发射功率可以是UE为所述第一小区组在第一子帧的信道发射的分配的功率。根据PCM1或者PCM2，用户设备的总功率在两个基站或小区组之间进行分配，SRS的可用发射功率为UE为该SRS所在的小区组分配的功率。
4)第一发射功率为UE在所述第一小区组分配的功率减去所述UE在所述第一小区组优先级高于SRS的信道的功率。
例如，当UE在第一小区组的第一子帧有除SRS之外的其他信道发射时，由于SRS的信道的优先级低，需要优先将功率分配给其他待向第一小区组发射的信道。
可选的，步骤203中的UE对所述SRS进行的功率压缩为等比例压缩。
UE对SRS进行功率压缩至满足第一发射功率的实现方式可以为：
用户设备根据计算的SRS的要求发射功率和上述第一发射功率确定所述SRS的实际发射功率。上述至少两个SRS的要求发射功率之和超过第一发射功率
Figure PCTCN2014091470-appb-000001
则压缩上述至少两个SR的信道功率，一种等比例压缩SRS功率的方式如下：
Figure PCTCN2014091470-appb-000002
其中，
Figure PCTCN2014091470-appb-000003
为PSRS,c(i)的线性值，
Figure PCTCN2014091470-appb-000004
为上述至少两个SRS中一个SRS的要求发射功率；
Figure PCTCN2014091470-appb-000005
为
Figure PCTCN2014091470-appb-000006
的线性值；w(i)为
Figure PCTCN2014091470-appb-000007
的压缩因子，0<w(i)≤1。
图3为本发明实施例提供的一种用户设备UE，能够用于实现上述方法实施例中的全部信号传输方法，如图3所述，该用户设备包括：
确定模块301，用于确定第一小区组的第一子帧的信道状态。
该第一小区组由一个基站下为该UE服务的一个或多个小区组成。
例如：用户设备确定第一小区组的所有激活小区在第一子帧的信道状态，包括确定是否有以下信道之一需要发射：物理上行控制信道(physical uplink control channel，简称PUCCH)、物理上行共享信道(Physical uplink shared channel，简称PUSCH)、物理随机接入信道(Physical random access channel，简称PRACH)、SRS。
处理模块302，用于当确定所述信道状态满足第一预设条件时，则确定不发射探测参考信号SRS；
其中，所述第一预设条件包括：在所述第一子帧上待发射的SRS数量为一个，且所述UE不能以所述SRS要求的功率发射所述SRS。
上述SRS要求的功率指UE向基站发射SRS时要求的发射功率。
这种情况下，UE有效避免了降功率发射SRS导致的基站对上行信道探测的不准确。
可选的，该第一预设条件还可以进一步包括：UE在第一子帧没有其他信道需要发射，所述其他信道包括以下信道中的一种或多种：PUCCH，PUSCH，以及PRACH。
需要说明的是，本发明实施例中的确定有没有需要发射的信道，即确定有没有需要通过这些信道(如PUCCH、PUSCH或PRACH等)发射的信息。
可选的，处理模块32进一步用于：当所述UE确定所述信道状态满足第二预设条件时，则确定需要对SRS进行功率压缩至满足第一发射功率后发射所述SRS；
相应的，如图4所示，UE还可以包括发射模块43，用于向基站发射进行功率压缩后的SRS。
上述所述第二预设条件包括：在第一子帧上待发射的SRS数量为至少两个，且UE不能以所述SRS要求的功率发射所述至少两个的SRS。
这种情况下，可以通过降功率后的多个SRS的发射，保证上行信道的探测。此时，基站可以通过接收多个功率压缩后的SRS，从而预期SRS的功率是否被压缩，并基于此获得更为准确的上行信道的相位信息。
上述任意一个SRS要求的功率(即SRS要求的发射功率)可以由如下计算公式得到：
PSRS,c(i)＝min{PCMAX,c(i),PSRS_OFFSET,c(m)+10log10(MSRS,c)+PO_PUSCH,c(j)+αc(j)·PLc+fc(i)}
其中，
PCMAX,c(i)为UE子帧i在服务小区c的最大发射功率；
PSRS_OFFSET,c(m)为高层配置的半静态参数；
MSRS,c为SRS的传输带宽；
fc(i)为当前PUSCH的功率调整；
PO_PUSCH,c(j)为高层配置的PUSCH信道的功率偏置；
αc(j)为路径损耗补偿值。
上述第一发射功率可以包括以下几种情况之一：
1)第一发射功率为UE的最大发射功率减去优先级高于SRS的信道的功率。
例如，由于SRS的信道优先级最低，根据PCM1，UE先将功率分配给比SRS的信道优先级高的信道，如PUCCH、PUSCH。因此SRS可用的发射功率为UE的最大发射功率减去优先级高于SRS的信道的功率。上述优先 级高于SRS的信道可以包括第一小区组及第二小区组内所有优先级高于SRS的待发射信道。所述第二小区组和所述第一小区组是为所述UE服务的两个不同小区组。
2)第一发射功率为UE的最大发射功率减去优先级高于SRS的信道的功率，再减去第二小区组的SRS的功率，所述第二小区组和所述第一小区组是为所述UE服务的两个不同小区组。
例如，由于MCG(Master Cell Group，主小区组)的SRS优先级高于SCG(Secondary Cell Group，辅小区组)的SRS优先级，当第一小区组为SCG，第二小区组为MCG时，UE的发射功率优先分配给第二小区组的SRS，剩余的功率为第一小区组的SRS的可用功率。
3)第一发射功率为UE在所述第一小区组分配的功率；
例如，第一发射功率可以是UE为所述第一小区组在第一子帧的信道发射的分配的功率。根据PCM1或者PCM2，用户设备的总功率在两个基站或小区组之间进行分配，SRS的可用发射功率为UE为该SRS所在的小区组分配的功率。
4)第一发射功率为UE在所述第一小区组分配的功率减去所述UE在所述第一小区组优先级高于SRS的信道的功率。
例如，当UE在第一小区组的第一子帧有除SRS之外的其他信道发射时，由于SRS的信道的优先级低，需要优先将功率分配给其他待向第一小区组发射的信道。
可选的，对所述SRS进行的功率压缩为等比例压缩。
处理模块32对SRS进行功率压缩至满足第一发射功率的实现方式可以为：
处理模块32根据计算的SRS的要求发射功率和上述第一发射功率确定所述SRS的实际发射功率。上述至少两个SRS的要求发射功率之和超过第一发射功率
Figure PCTCN2014091470-appb-000008
则压缩上述至少两个SR的信道功率，一种等比例压缩SRS功率的方式如下：
Figure PCTCN2014091470-appb-000009
其中，
Figure PCTCN2014091470-appb-000010
为PSRS,c(i)的线性值，
Figure PCTCN2014091470-appb-000011
为上述至少两个SRS中一个SRS的要求发射功率；
Figure PCTCN2014091470-appb-000012
为
Figure PCTCN2014091470-appb-000013
的线性值；w(i)为
Figure PCTCN2014091470-appb-000014
的压缩因子，0<w(i)≤1。
需要说明的是，本发明实施例中的发射模块43可以由发射器来实现。确定模块31和处理模块32由UE的处理器来实现，这里处理器可以是一个中央处理器(Central Processing Unit，CPU)，或者是特定集成电路(Application Specific Integrated Circuit，ASIC)，或者完成实施本发明实施例的一个或多个集成电路。UE还可以包括存储器，存储器用于存储指令代码，处理器调用存储器的指令代码，控制本发明实施例中的确定模块31、处理模块32和发射模块43执行上述操作。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换。因此，本发明的保护范围应以权利要求的保护范围为准。

Claims (10)

  1. 一种信号发射方法，其特征在于，包括：
    用户设备UE确定第一小区组的第一子帧的信道状态；
    当所述UE确定所述信道状态满足第一预设条件时，则所述UE确定不发射探测参考信号SRS；
    其中，所述第一预设条件包括：在所述第一子帧上待发射的SRS数量为一个，且所述UE不能以所述SRS要求的功率发射所述SRS。
  2. 根据权利要求1所述的方法，其特征在于，所述第一预设条件进一步包括：
    所述UE在所述第一子帧没有其他信道需要发射，所述其他信道包括以下信道中的一种或多种：PUCCH，PUSCH，以及PRACH。
  3. 根据权利要求1或2所述的方法，其特征在于，进一步包括：
    当所述UE确定所述信道状态满足第二预设条件时，则所述UE确定需要对SRS进行功率压缩至满足第一发射功率后发射所述SRS；
    其中，所述第二预设条件包括：
    在所述第一子帧上待发射的SRS数量为至少两个，且UE不能以所述SRS要求的功率发射所述至少两个的SRS。
  4. 根据权利要求3所述的方法，其特征在于，第一发射功率为：
    所述UE的最大发射功率减去优先级高于SRS的信道的功率；或者
    所述UE的最大发射功率减去优先级高于SRS的信道的功率，再减去第二小区组的SRS的功率，所述第二小区组和所述第一小区组是为所述UE服务的两个不同小区组；或者
    所述UE在所述第一小区组分配的功率；或者
    所述UE在所述第一小区组分配的功率减去所述UE在所述第一小区组优先级高于SRS的信道的功率。
  5. 根据权利要求3或4所述的方法，其特征在于，所述UE对所述SRS 进行的功率压缩为等比例压缩。
  6. 一种用户设备UE，其特征在于，包括：
    确定模块，用于确定第一小区组的第一子帧的信道状态；
    处理模块，用于当确定所述信道状态满足第一预设条件时，则确定不发射探测参考信号SRS；
    其中，所述第一预设条件包括：在所述第一子帧上待发射的SRS数量为一个，且所述UE不能以所述SRS要求的功率发射所述SRS。
  7. 根据权利要求6所述的UE，其特征在于，所述预设条件进一步包括：
    所述UE在所述第一子帧没有其他信道需要发射，所述其他信道包括以下信道中的一种或多种：PUCCH，PUSCH，以及PRACH。
  8. 根据权利要求6或7所述的UE，其特征在于，所述处理模块进一步用于：
    当所述UE确定所述信道状态满足第二预设条件时，则确定需要对SRS进行功率压缩至满足第一发射功率后发射所述SRS；
    其中，所述第二预设条件包括：
    在所述第一子帧上待发射的SRS数量为至少两个，且所述UE不能以所述SRS要求的功率发射所述至少两个的SRS。
  9. 根据权利要求8所述的UE，其特征在于，第一发射功率为：
    所述UE的最大发射功率减去优先级高于SRS的信道的功率；或者
    所述UE的最大发射功率减去优先级高于SRS的信道的功率，再减去第二小区组的SRS的功率，所述第二小区组和所述第一小区组是为所述UE服务的两个不同小区组；或者
    所述UE在所述第一小区组分配的功率；或者
    所述UE在所述第一小区组分配的功率减去所述UE在所述第一小区组优先级高于SRS的信道的功率。
  10. 根据权利要求8或9所述的UE，其特征在于，所述对SRS进行的功率压缩为等比例压缩。
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