CN103220768B

CN103220768B - Uplink signal power extraction method and device in a kind of carrier aggregation system

Info

Publication number: CN103220768B
Application number: CN201210019827.8A
Authority: CN
Inventors: 林志嵘; 戴博; 任璐; 夏树强
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-01-21
Filing date: 2012-01-21
Publication date: 2018-06-19
Anticipated expiration: 2032-01-21
Also published as: CN103220768A

Abstract

The invention discloses uplink signal power extraction method and devices in a kind of carrier aggregation system, UE is configured with multiple Timing Advances, when time-domain symbol is misaligned and when time-domain symbol occurs on different carrier wave forward lapping between the up channel of different carriers carries, if it is determined that the sum of transmission power of each up channels of UE more than the maximum transmission power that UE is configured, then base station instruction UE is cut down the transmission power of up channel that time-domain symbol forward laps occurs on different carrier waves.The present invention is solved under MTA scenes, when the signal code of different upstream components carrier-wave transmissions forward laps in the time domain, power extraction problem when the transimission power of the symbol of overlapping has been more than the maximum transmission power of UE configurations ensures to be configured with the normal work of the carrier aggregation system of MTA.

Description

Uplink signal power reduction method and device in carrier aggregation system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for reducing uplink signal power in a carrier aggregation system.

Background

Uplink Physical channels of The Third Generation Partnership Project (3 GPP) Long Term Evolution (LTE) system include a Physical Random Access Channel (PARCH), a Physical Uplink Shared Channel (PUSCH), and a Physical Uplink Control Channel (PUCCH). The uplink of LTE adopts a single carrier Frequency division multiplexing (OFDM) technique, and reference signals and data are multiplexed together by TDM (Time division multiplexing). The uplink Reference Signal is divided into a Demodulation Reference Signal (DMRS) and a Sounding Reference Signal (SRS). The DMRS is divided into a reference signal for PUCCH demodulation and a reference signal for PUSCH demodulation, and is respectively used for different channel transmission, and the DMRS mainly has the functions of estimation of an uplink channel and coherent detection and demodulation of a base station (eNB for short); the SRS is mainly used for measuring an uplink channel, and is convenient for the eNB to perform frequency selective scheduling.

In an LTE system, in order to implement and maintain uplink synchronization between a User Equipment (UE) and a base station, the base station sends a Timing Advance (TA) to each UE according to a transmission delay between the base station and each UE, and the UEs advance or delay their uplink transmission timings according to the timing advance sent by the base station, so as to compensate for a transmission delay from a UE to the base station, and enable uplink signals of different UEs to reach the base station within a reception window of the base station.

The LTE-a (LTE Advanced, abbreviated as LTE-a) system is a next generation evolution system of the LTE system, and it introduces a concept of Carrier Aggregation. The LTE system bandwidth of Carrier aggregation may be regarded as Component carriers (Component Carrier spectrum), and each Component Carrier may also be referred to as a serving Cell (serving Cell), that is, one spectrum may be aggregated by multiple Component Carrier frequencies (serving cells). The resource for one R10 UE is composed of multiple serving cells (component carriers) in the frequency domain, where one cell is called a Primary cell (PCell) and the rest of the cells are called Secondary cells (scells).

After the carrier aggregation technology is introduced, the user equipment can simultaneously work on a plurality of component carriers, and the component carriers can be continuous or discontinuous on a frequency band; may be within the same frequency band or may be from different frequency bands. For the case that the component carriers are not continuous or the component carriers come from different frequency bands, the timing advance on each component carrier may be different because each component carrier has different transmission characteristics; even if the component carriers belong to the same frequency band and are continuous on the frequency band, if the component carriers originate from different Radio Remote Units (RRUs), or the component carriers are processed by different repeaters (repeaters) respectively in order to increase cell coverage, the timing advances on the component carriers may be different from each other. In the LTE system, the UE only needs to maintain uplink synchronization of one uplink on one carrier (for the time division duplex mode, one carrier is used, and for the frequency division duplex mode, including a pair of uplink and downlink carriers, for convenience of description, this is simply referred to as one carrier), while in the carrier aggregation system, the UE may simultaneously operate on multiple component carriers, and the TAs of these component carriers may be different, that is, Multiple Timing Advances (MTA).

In the MTA scenario, since the TAs of different uplink component carriers may be different, it means that signal symbols transmitted on different uplink component carriers may not be aligned in the time domain, that is, there is a possibility that signal symbols transmitted on different uplink component carriers overlap back and forth in the time domain.

In the LTE system, if the transmission power of signal symbols transmitted on different uplink component carriers exceeds the maximum transmission power configured by the UE, the power of the uplink signal needs to be reduced. In the existing Rel-10 LTE protocol, only a power reduction method is defined when signals of multiple uplink carriers are in the same TA, that is, when uplink signals of the uplink carriers are aligned in time domain symbols. The method comprises the following specific steps:

1. when Uplink channels on a plurality of Uplink carriers configured by the UE include a PUCCH and a PUSCH, and the PUSCH does not carry Uplink Control Information (UCI), the UE does not reduce the transmission power of the PUCCH, and performs power reduction with equal proportion on the transmission power of all PUSCHs until the transmission power of the UE does not exceed the maximum transmission power configured by the UE.

2. When uplink channels on a plurality of uplink carriers configured by the UE are PUSCHs, wherein the PUSCHs carry UCI, the UE does not reduce the transmitting power of the PUSCHs carrying the UCI, and performs power reduction with equal proportion on the transmitting power of all PUSCHs not carrying the UCI until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE.

3. When uplink channels on a plurality of uplink carriers configured by the UE are PUSCHs and all the PUSCHs do not carry UCI, the UE performs power reduction on the transmission power of all the PUSCHs in an equal proportion until the transmission power of the UE does not exceed the maximum transmission power configured by the UE.

4. When uplink channels on a plurality of uplink carriers configured by the UE comprise PUCCH and PUSCH carrying UCI exists in the PUSCH, the UE does not reduce the power of the PUCCH and the PUSCH carrying UCI, and performs equal proportion power reduction on the transmitting power of the PUSCH not carrying UCI until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE.

5. When the uplink signals on the plurality of uplink carriers configured by the UE are all the SRSs, the UE performs power reduction on the transmission power of all the SRSs in an equal proportion until the transmission power of the UE does not exceed the maximum transmission power configured by the UE.

In combination with the above description, in an MTA scenario, if the transmission power of symbols overlapped front and back in a time domain exceeds the maximum transmission power configured by the UE, power reduction needs to be performed on an uplink signal. However, in the current Rel-10 and previous releases of LTE protocols, there is no power reduction method defined when transmission symbols overlap one another in the time domain, and the transmission power of the overlapping symbols exceeds the maximum transmission power configured by the UE. Therefore, in order to ensure the normal operation of the carrier aggregation system configured with the MTA, it is necessary to define a power reduction method when, in an MTA scenario, when signal symbols transmitted by different uplink component carriers overlap front and back in a time domain, transmission power of the overlapped symbols exceeds maximum transmission power configured by the UE.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method and a device for reducing the power of an uplink signal in a carrier aggregation system, which solve the power reduction problem when the transmission power of overlapped symbols exceeds the maximum transmission power configured by UE (user equipment) when signal symbols transmitted by different uplink component carriers are overlapped front and back on a time domain in an MTA (maximum transmission access) scene, and ensure the normal work of the carrier aggregation system configured with MTA.

To solve the above technical problem, the present invention provides a method for reducing uplink signal power in a carrier aggregation system,

user Equipment (UE) is configured with a plurality of timing advances, when time domain symbols between uplink channels carried by different carriers are not aligned and the time domain symbols on different carriers are overlapped front and back, if the sum of the transmitting power of each uplink channel of the UE is judged to exceed the maximum transmitting power configured by the UE, the UE is configured with a plurality of timing advances

And the base station indicates the UE to reduce the transmitting power of the uplink channel with the time domain symbols overlapped front and back on different carriers.

Further, the base station indicates a predefined rule for the UE to power down;

the UE reduces the transmit power of the uplink channel on which the time domain symbols overlap on different carriers according to the predefined rule indicated by the base station.

Further, the predefined rule includes:

proportionally reducing the transmitting power of an uplink channel of each uplink carrier until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; or,

sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; or,

only the transmit power of the symbols that overlap on different channels is reduced.

Further, the base station indicates the UE power reduction mode and/or power reduction object;

wherein the power reduction mode includes: carrying out equal-proportion reduction on the transmitting power of each uplink channel; sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high;

the power curtailment object comprising: all uplink channels; an uplink channel is designated.

Further, the priority of the uplink channel is established in a manner of combining one or more of the following:

setting priority according to the channel type, wherein the priority is as follows: PUCCH, PUSCH;

setting priority according to carriers carrying uplink channels, wherein the priority is from high to low: PCell, SCell;

if the uplink channel with overlapped front and back symbols in the time domain is a plurality of PUSCHs, establishing the priority according to whether UCI is carried, wherein the priority is from high to low: PUSCH carrying UCI, PUSCH not carrying UCI.

The priority is established according to the subframe index, and the priority is from high to low: an uplink channel in a previous subframe and an uplink channel in a subsequent subframe;

the priority is established according to the subframe index, and the priority is from high to low: an uplink channel in a subsequent subframe, an uplink channel in a previous subframe;

if the uplink channel with the time domain symbols overlapped front and back in the time domain is a plurality of PUSCHs, the priority is established according to whether the retransmission data carried by the PUSCHs is carried, and the priority is from high to low: PUSCH carrying newly transmitted data and PUSCH carrying retransmitted data.

Further, the base station instructs the UE to reduce the transmission power of the uplink channel on different carriers where time domain symbols overlap front and back through physical layer signaling or high layer signaling.

The invention also provides a method for reducing the uplink signal power in the carrier aggregation system, wherein the UE is configured with a plurality of time leads, when time domain symbols between uplink channels carried by different carriers are not aligned and the time domain symbols on different carriers are overlapped front and back, if the sum of the transmitting power of each uplink channel of the UE is judged to exceed the maximum transmitting power configured by the UE, the UE can reduce the uplink signal power in the carrier aggregation system

And the UE reduces the transmitting power of the uplink channel with the time domain symbols overlapped front and back on different carriers according to a predefined rule.

Further, the predefined rule includes:

Furthermore, when only the transmission power of the symbols overlapped on the different channels is reduced, the transmission power of the symbols overlapped is reduced in an equal proportion, or the symbols overlapped on the different channels are reduced in power according to the descending order of the priority of the uplink channel corresponding to the symbols overlapped.

Further, the UE determines whether the sum of the transmit powers of the uplink channels exceeds the maximum transmit power configured by the UE according to one of the following manners:

judging whether the sum of the uplink channel transmitting power borne by each uplink carrier in the current subframe exceeds the maximum transmitting power configured by the UE; or,

and judging whether the sum of the uplink channel transmitting power borne by each uplink carrier in the current subframe and the uplink channel transmitting power borne by each uplink carrier to be transmitted in the next subframe exceeds the maximum transmitting power configured by the UE.

The invention also provides a device for reducing the power of the uplink signal in the carrier aggregation system, which comprises a transmitting power judging unit and a power reduction indicating unit in the base station and a power reduction executing unit in the UE, wherein:

the transmitting power judging unit is used for judging whether time domain symbols are overlapped front and back on different carriers when the user equipment configures a plurality of time leads and judges whether the time domain symbols on the uplink channels carried by the different carriers are not aligned, and if so, judging whether the sum of the transmitting power of each uplink channel of the UE exceeds the maximum transmitting power configured by the UE;

the power reduction indicating unit is used for indicating the UE to reduce the transmitting power of the uplink channel with time domain symbols overlapped front and back on different carriers if the transmitting power judging unit judges that the sum of the transmitting power of each uplink channel of the UE exceeds the maximum transmitting power configured by the UE;

and the power reduction execution unit is used for reducing the transmitting power of the uplink channel with the time domain symbols overlapped front and back on different carriers according to the indication of the base station.

Further, the power reduction indication unit is configured to indicate a predefined rule of the UE power reduction;

the power reduction execution unit is used for reducing the transmitting power of the uplink channel with the overlapped time domain symbols on different carriers according to the predefined rule indicated by the power reduction indication unit;

wherein the predefined rule comprises: proportionally reducing the transmitting power of an uplink channel of each uplink carrier until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; or, sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; alternatively, only the transmit power of the symbols that overlap on different channels is reduced.

Further, the power reduction instruction unit is configured to instruct the UE to perform power reduction and/or power reduction target;

the power reduction execution unit is used for reducing the transmitting power of the power reduction object according to the power reduction mode indicated by the power reduction indication unit;

wherein the power reduction mode includes: carrying out equal-proportion reduction on the transmitting power of each uplink channel; sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high; the power curtailment object comprising: all uplink channels; an uplink channel is designated.

Further, the transmission power determining unit is configured to, when receiving a notification that the UE is in the power limited state, determine that a sum of transmission powers of uplink channels of the UE exceeds a maximum transmission power configured by the UE.

Further, the power reduction indication unit is configured to indicate, through physical layer signaling or higher layer signaling, the UE to reduce the transmit power of an uplink channel on which time domain symbols overlap front and back on different carriers.

In addition, the invention also provides a device for reducing the power of the uplink signal in the carrier aggregation system, which comprises a transmitting power judging module and a transmitting power reducing module in the UE, wherein:

the transmission power judging module is used for configuring a plurality of time leads by the UE, and judging whether the sum of the transmission power of each uplink channel of the UE exceeds the maximum transmission power configured by the UE when time domain symbols among the uplink channels carried by different carriers are not aligned and the front and back of the time domain symbols are overlapped on different carriers;

the transmission power reduction module is used for reducing the transmission power of the uplink channel with time domain symbols overlapped front and back on different carriers according to a predefined rule if the transmission power judgment module judges that the sum of the transmission power of each uplink channel of the UE exceeds the maximum transmission power configured by the UE.

Further, the transmit power reduction module is configured to reduce the transmit power of an uplink channel on which time domain symbols overlap front and back on different carriers according to the following predefined rule:

Furthermore, when the transmission power reduction module only reduces the transmission power of the symbols overlapped on the different channels, the transmission power of the symbols overlapped is reduced in equal proportion, or the symbols overlapped on the different channels are reduced in power according to the sequence from low to high of the priority of the uplink channel corresponding to the symbols overlapped.

Further, the transmission power reduction module is configured to determine whether the sum of the transmission powers of the uplink channels exceeds a maximum transmission power configured by the UE according to one of the following manners:

In summary, the present invention provides an uplink signal power reduction scheme, which solves the power reduction problem when, in a carrier aggregation system configured with MTA, signal symbols transmitted by different uplink component carriers overlap front and back in a time domain, and transmission power of the overlapped symbols exceeds maximum transmission power configured by a UE.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a flowchart illustrating a method for reducing uplink signal power in a carrier aggregation system according to a first embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for reducing uplink signal power in a carrier aggregation system according to a second embodiment of the present invention;

fig. 3 is a schematic diagram of uplink symbols transmitted by different uplink component carriers according to embodiments 1-1, 1-2, 1-3 and 1-11 of the present invention partially overlapping;

fig. 4 is a schematic diagram of partial overlapping of uplink symbols transmitted by different uplink component carriers according to embodiments 1-4 and 1-5 of the present invention;

fig. 5 is a schematic diagram of partial overlapping of uplink symbols transmitted by different uplink component carriers according to embodiments 1-6, 1-7 and 1-8 of the present invention;

fig. 6 is a schematic diagram of partial overlapping of uplink symbols transmitted by different uplink component carriers according to embodiments 1-9 and 1-10 of the present invention;

fig. 7 is a schematic diagram of partial overlapping of uplink symbols transmitted by different uplink component carriers according to embodiments 2-1, 2-2 and 2-3 of the present invention;

fig. 8 is a schematic diagram of uplink symbols transmitted by different uplink component carriers according to embodiments 2-4 and 2-5 of the present invention partially overlapping;

fig. 9 is a schematic diagram of uplink symbol partial overlapping of different uplink component carrier transmissions according to embodiments 2-6, 2-7 and 2-8 of the present invention;

fig. 10 is a schematic diagram of partial overlapping of uplink symbols transmitted by different uplink component carriers according to embodiments 2-9 and 2-10 of the present invention.

Detailed Description

The embodiment provides a method for reducing uplink signal power in a carrier aggregation system, which adopts the following scheme:

the user equipment is configured with a plurality of TAs, when time domain symbols between uplink channels carried by different carriers are not aligned and the time domain symbols on different carriers are overlapped front and back, if the sum of the transmitting power of each uplink channel of the UE is judged to exceed the maximum transmitting power configured by the UE, the UE is configured with a plurality of TAs

And the base station instructs the UE to reduce the transmitting power of the uplink channel with the time domain symbols overlapped front and back on different carriers.

Specifically, the base station may instruct the UE to reduce the transmission power of the uplink channel on different carriers where time domain symbols overlap front and back through physical layer signaling or higher layer signaling.

Further, the base station may indicate a predefined rule for UE power reduction;

Alternatively, the base station may instruct the UE to perform power reduction and/or power reduction;

the UE reduces the transmission power of the power reduction target (i.e., the designated uplink channel) according to the power reduction mode indicated by the base station.

As shown in fig. 1, the method for reducing uplink signal power in a carrier aggregation system according to this embodiment mainly includes the following steps:

step one, in a carrier aggregation system configured with an MTA, a UE finds that time domain symbols are overlapped front and back between uplink signals carried in different uplink carriers, and the sum of the transmission powers of the overlapped symbols exceeds the maximum transmission power configured by the UE.

Step two, the eNB informs the UE through signaling to reduce the power of the transmitting power of the uplink signal;

for example, the base station notifies the UE to perform power reduction according to a predetermined rule, or the base station instructs the UE to perform power reduction on the transmission power of a designated power reduction target (uplink channel), and may designate a power reduction mode.

The base station can instruct the UE to reduce the transmitting power of all uplink channels; the UE may also be instructed to reduce the power only on symbols that overlap on different channels, and not to reduce the power of symbols that do not overlap.

The power reduction method specified by the base station may be: carrying out equal-proportion reduction on the transmitting power of uplink channels on different carriers; and performing power reduction according to the priority of the uplink channel, namely reducing the transmitting power of the uplink channel with lower priority, and then reducing the transmitting power of the uplink channel with higher priority, and the like.

And step three, the UE carries out power reduction on the transmitting power of the uplink signals carried in different uplink carriers according to the instruction of the eNB.

And step four, after the transmitting power of the UE is reduced to be not more than the maximum transmitting power configured by the UE, the UE transmits the uplink signal.

Further, in the foregoing embodiment, if the UE determines that the sum of the transmit powers of the uplink channels exceeds the maximum transmit power configured by the UE, the UE may notify the base station through the physical layer uplink signaling, so that the base station knows that the UE is in the power limited state.

Another embodiment of the present invention provides a method for reducing uplink signal power in a carrier aggregation system, including:

the user equipment is configured with a plurality of TAs, when time domain signals between uplink channels carried by different carriers are not aligned and time domain symbols on different carriers are overlapped front and back, if the sum of the transmitting power of each uplink channel of the UE is judged to exceed the maximum transmitting power configured by the UE, the UE is configured with a plurality of TAs

As shown in fig. 2, the present embodiment provides a method for reducing uplink signal power in a carrier aggregation system, which adopts the following scheme:

And step two, the UE carries out power reduction on the transmitting power of the uplink signals carried in different uplink carriers according to a predefined rule.

The UE can reduce the transmitting power of all uplink channels in equal proportion; or, the power can be reduced according to the priority of the uplink channel, the transmitting power of the uplink channel with lower priority is reduced first, and then the transmitting power of the uplink channel with higher priority is reduced; or, the power of the symbol overlapped on different channels can be reduced, and the power of the symbol not overlapped is not reduced; and the like.

And step three, after the transmitting power of the UE is reduced to be not more than the maximum transmitting power configured by the UE, the UE transmits the uplink signal.

Further, in the foregoing embodiment, the uplink channel is a PUSCH and/or a PUCCH and/or a PRACH.

Further, in the foregoing embodiment, the method for the UE to determine whether the sum of the transmission powers of the uplink channels exceeds the maximum transmission power configured by the UE may be one of the following methods:

1) and the UE judges whether the sum of the uplink channel powers borne by the uplink carriers in the current subframe exceeds the maximum transmission power configured by the UE.

2) And the UE judges whether the sum of the uplink channel power borne by each uplink carrier in the current subframe and the uplink channel power borne by each uplink carrier to be transmitted in the next subframe exceeds the maximum transmission power configured by the UE.

Further, in the above embodiment, the predefined rule is at least one of the following rules:

rule 1, proportionally reducing the transmission power of the uplink channel of each uplink carrier until the transmission power of the UE does not exceed the maximum transmission power configured by the UE.

And 2, according to a certain priority, performing power reduction on each uplink channel, namely reducing the transmitting power of one or more uplink channels with lower priority, and then reducing the transmitting power of one or more uplink channels with higher priority.

Rule 3 reduces the transmission power only for symbols that overlap on different channels, but does not reduce the transmission power for symbols that do not overlap.

Further, in the predefined rule 2, the number of uplink channels in the same priority may be one or more.

Furthermore, in the predefined rule 2, if the reduction of the transmission power of the one or more uplink channels with lower priority can already make the total transmission power of the uplink channels of the UE not exceed the maximum transmission power configured by the UE, the transmission power of the one or more uplink channels with higher priority is not reduced.

Further, in the above predefined rule 2, if the target of power reduction is a plurality of uplink channels, the power reduction method is an equal-rate reduction.

Further, the priority level establishing method in the rule 2 is one or more of the following ways in combination with each other:

the method comprises the following steps of 1, establishing the priority according to the channel type, wherein the priority from high to low can be: PUCCH, PUSCH.

A making mode 2, making the priority according to the carrier carrying the uplink channel, wherein the priority from high to low can be: PCell, SCell.

If the uplink channel with overlapped front and back symbols in the time domain is a plurality of PUSCHs, the priority is established according to whether the uplink channel carries the UCI, and the priority can be from high to low: PUSCH carrying UCI, PUSCH not carrying UCI.

And 4, the priority level is established according to the subframe index, and the priority level from high to low can be as follows: an uplink channel in a previous subframe, and an uplink channel in a subsequent subframe.

And 5, the priority level is established according to the subframe index, and the priority level from high to low can be as follows: an uplink channel in a subsequent subframe, and an uplink channel in a previous subframe.

If the uplink channel with time domain symbols overlapped front and back in the time domain is a plurality of PUSCHs, the priority is established according to whether the data is retransmitted or not carried by the PUSCHs, and the priority can be from high to low: PUSCH carrying newly transmitted data and PUSCH carrying retransmitted data.

Furthermore, the power reduction method in the above-mentioned predefined rule 3 may be an equal-scale reduction, and may also be a priority-based power reduction in the rule 2.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

Example 1

The UE configures two uplink carriers CCl and CC2, where CCl is PCell and CC2 is SCell. CC1 belongs to a different TA group than CC2, where CC1 belongs to TA group 1 and CC2 belongs to TA group 2.

Examples 1 to 1

As shown in fig. 3, in subframe n, both CC1 and CC2 need to transmit PUSCH. Since the TA of CC1 is different from that of CC2, the PUSCH symbol in subframe n on CC1 (denoted as PUSCH symbol) And PUSCH (denoted as PUSCH) in subframe n on CC2) The symbols partially overlap.

If the sum of the transmission power of the PUSCH on CC1 and the transmission power of the PUSCH on CC2 exceeds the maximum transmission power configured by the UE at this time.

The eNB informs the UE through signaling, and simultaneously reduces the transmission power of the CCs 1 and the PUSCHs on the CCs 2 in equal proportion and sends the reduced transmission power; or

The UE performs an equal reduction of the transmit power of the uplink channel on all carriers according to predefined rule 1.

The UE performs an equal proportional reduction on the transmission power of the PUSCH on CC1 and CC2 until the sum of the PUSCH transmission power on CC1 and CC2 does not exceed the maximum transmission power configured by the UE, and then the UE simultaneously transmits the PUSCH on CC1 and CC 2.

Examples 1 to 2

The eNB informs the UE through signaling, and according to a predefined rule 2, power reduction is carried out according to a certain priority, so that the transmitting power of one or more uplink channels with higher priority is ensured, and the transmitting power of one or more uplink channels with lower priority is reduced; or

And the UE performs power reduction according to a predefined rule 2 and a certain priority, ensures the transmitting power of one or more uplink channels with higher priority, and reduces the transmitting power of one or more uplink channels with lower priority.

In this case, if the priority scheme is scheme 2, since CC1 is PCell and CC2 is SCell, PUSCH on CC1 has higher priority than PUSCH on CC 2.

The UE reduces the transmission power of the PUSCH on the CC2 first, and then reduces the transmission power of the PUSCH on the CC1 until the total transmission power of the uplink channel of the UE is not higher than the maximum transmission power configured by the UE.

Examples 1 to 3

As shown in fig. 3, in subframe n, both CC1 and CC2 need to transmit PUSCH. Wherein, the PUSCH on CC1 carries UCI, and the PUSCH on CC2 does not carry UCI. Since the TA of CC1 is different from that of CC2, the PUSCH symbol in subframe n on CC1 (denoted as PUSCH symbol) And PUSCH (denoted as PUSCH) in subframe n on CC2) The symbols partially overlap.

If the priority level is determined as the priority level determination mode 3, the PUSCH on the CC1 carries UCI, and the PUSCH on the CC2 does not carry UCI, so the PUSCH on the CC1 has a higher priority level than the PUSCH on the CC 2.

Examples 1 to 4

As shown in fig. 4, in subframe n, CC1 needs to transmit PUSCH, and in subframe n +1, CC2 also needs to transmit PUSCH. Since the TA of CC1 is different from that of CC2, the PUSCH symbol in subframe n on CC1 (denoted as PUSCH symbol) And PUSCH (denoted as PUSCH) in subframe n +1 on CC2) The symbols partially overlap.

If the sum of the transmission power of the PUSCH on CC1 in subframe n and the transmission power of the PUSCH on CC2 in subframe n +1 exceeds the maximum transmission power configured by the UE at this time.

In this case, if the priority scheme is the priority scheme 4, the PUSCH in CC1 has higher priority than the PUSCH in CC 2.

Examples 1 to 5

In this case, if the priority scheme is the priority scheme 5, the PUSCH in CC2 has higher priority than the PUSCH in CC 1.

The UE reduces the transmission power of the PUSCH on the CC1 first, and then reduces the transmission power of the PUSCH on the CC2 until the total transmission power of the uplink channel of the UE is not higher than the maximum transmission power configured by the UE.

Examples 1 to 6

As shown in fig. 5, in subframe n, both CC1 and CC2 need to transmit PUSCH. Since the TA of CC1 is different from that of CC2, the PUSCH symbol in subframe n on CC1 (denoted as PUSCH symbol) And PUSCH (denoted as PUSCH) in subframe n on CC2) The symbols are partially overlapped, and the symbols in the overlapped part are marked as

Assume that at this time the sum of the transmit power of PUSCH on CC1 and the transmit power of PUSCH on CC2 exceeds the UE configured maximum transmit power.

The eNB signals the UE to perform power reduction in equal proportion on the overlapping portion of the CC1 and the PUSCH symbol on the CC 2; or

And the UE performs equal-proportion reduction on the power of the symbols which are overlapped on different channels according to a predefined rule 3, and does not reduce the power of the symbols which are not overlapped.

The UE only targets the symbols (denoted as symbols) overlapping in CC1 and PUSCH on CC2) Until the sum of the transmit power of the overlapping symbols in the PUSCH on CC1 and CC2 does not exceed the maximum transmit power configured by the UE, and then the UE sends CC1 and CC2 simultaneouslyPUSCH。

Examples 1 to 7

The eNB signals the UE to perform power reduction on the overlapping portion of CC1 and PUSCH symbol on CC2 according to priority; or

And the UE reduces the power of the symbols which are overlapped on different channels according to the predefined rule 3 according to the priority, and does not reduce the power of the symbols which are not overlapped.

The UE first reduces the transmission power of the overlapped symbols in the PUSCH on CC2, and then reduces the transmission power of the overlapped symbols in the PUSCH on CC1 until the sum of the transmission power of the overlapped symbols in the PUSCH on CC1 and CC2 does not exceed the maximum transmission power configured by the UE, and then the UE simultaneously transmits the PUSCH on CC1 and CC 2.

Examples 1 to 8

As shown in fig. 5, in subframe n, both CC1 and CC2 need to transmit PUSCH. Wherein PUSCH in CC1 carries UCI, PUSCH in CC2 does not carry UCI, and since TA of CC1 is different from TA of CC2, PUSCH symbol (denoted as PUSCH symbol) in subframe n on CC1) And PUSCH (denoted as PUSCH) in subframe n on CC2) The symbols are partially overlapped, and the symbols in the overlapped part are marked as

In this case, if the priority scheme is scheme 3, the PUSCH on CC1 has higher priority than the PUSCH on CC 2.

Examples 1 to 9

As shown in fig. 6, in subframe n, CC1 needs to transmit PUSCH, and in subframe n +1, CC2 needs to transmit PUSCH. Since the TA of CC1 is different from that of CC2, the PUSCH symbol in subframe n on CC1 (denoted as PUSCH symbol) And PUSCH (denoted as PUSCH) in subframe n +1 on CC2) The symbols are partially overlapped, and the symbols in the overlapped part are marked as

In this case, if the priority scheme is the scheme 4, the PUSCH on CC1 has higher priority than the PUSCH on CC 2.

Examples 1 to 10

As shown in fig. 6, in subframe n, CC1 needs to transmit PUSCH, and in subframe n +1CC2 requires transmission of PUSCH. Since the TA of CC1 is different from that of CC2, the PUSCH symbol in subframe n on CC1 (denoted as PUSCH symbol) And PUSCH (denoted as PUSCH) in subframe n +1 on CC2) The symbols are partially overlapped, and the symbols in the overlapped part are marked as

In this case, if the priority scheme is the scheme 5, the PUSCH on CC2 has higher priority than the PUSCH on CC 1.

The UE first reduces the transmission power of the overlapped symbols in the PUSCH on CC1, and then reduces the transmission power of the overlapped symbols in the PUSCH on CC2 until the sum of the transmission power of the overlapped symbols in the PUSCH on CC1 and CC2 does not exceed the maximum transmission power configured by the UE, and then the UE simultaneously transmits the PUSCH on CC1 and CC 2.

Examples 1 to 11

As shown in fig. 3, in subframe n, both CC1 and CC2 need to transmit PUSCH. The PUSCH on CC1 carries newly transmitted data, and the PUSCH on CC2 carries retransmitted data. Since TA of CC1 is different from TA of CC2PUSCH symbol in subframe n on this CC1 (denoted as) And PUSCH (denoted as PUSCH) in subframe n on CC2) The symbols partially overlap.

In this case, if the priority scheme is the priority scheme 6, the PUSCH in CC1 carries the newly transmitted data and the PUSCH in CC2 carries the retransmitted data, so the PUSCH in CC1 has higher priority than the PUSCH in CC 2.

Example 2

The UE configures two uplink carriers CC1 and CC2, where CC1 is PCell and CC2 is SCell. CC1 belongs to a different TA group than CC2, where CC1 belongs to TA group 1 and CC2 belongs to TA group 2.

Example 2-1

As shown in fig. 7, in subframe n, CC1 needs to transmit PUCCH and CC2 needs to transmit PUSCH. Since CC1 differs from the TA of CC2, the PUCCH symbol (denoted as symbol) in subframe n on CC1) And PUSCH (denoted as PUSCH) in subframe n on CC2) The symbols partially overlap.

If the sum of the transmission power of the PUCCH on CC1 and the transmission power of the PUSCH on CC2 exceeds the maximum transmission power configured by the UE at this time.

The eNB informs the UE through signaling, and simultaneously reduces the transmission power of the PUCCH on the CC1 and the PUSCH on the CC2 in equal proportion and sends the reduced transmission power; or

The UE performs an equal proportional reduction of the transmit power of the PUCCH on CC1 and the PUSCH on CC2 until the sum of the transmit power of the PUCCH on CC1 and the PUSCH on CC2 does not exceed the maximum transmit power configured by the UE, and then the UE simultaneously transmits the PUCCH on CC1 and the PUSCH on CC 2.

Examples 2 to 2

As shown in fig. 7, in subframe n, CC1 needs to transmit PUCCH and CC2 needs to transmit PUSCH. Since CC1 differs from the TA of CC2, the PUCCH symbol (denoted as symbol) in subframe n on CC1) And PUSCH (denoted as PUSCH) in subframe n on CC2) SymbolA partial overlap occurs.

The eNB signals the UE to perform power reduction on the transmission power of a PUCCH on the CC1 and the transmission power of a PUSCH on the CC2 according to the priority; or

And the UE reduces the transmitting power of the uplink channels on all the carriers according to the priority according to a predefined rule 2.

In this case, if the priority scheme is the scheme 1, the priority of the PUCCH on CC1 is higher than that of the PUSCH on CC 2.

The UE first reduces the PUSCH transmit power on CC2 and then reduces the PUCCH transmit power on CC1 until the sum of the PUCCH transmit power on CC1 and the PUSCH transmit power on CC2 does not exceed the maximum transmit power configured by the UE. The UE then sends the PUCCH on CC1 with the PUSCH on CC 2.

Examples 2 to 3

In this case, if the priority scheme is scheme 2, the priority of the PUCCH on CC1 is higher than that of the PUSCH on CC 2.

Examples 2 to 4

As shown in fig. 8, in subframe n, CC1 needs to transmit PUCCH, and in subframe n +1, CC2 needs to transmit PUSCH. Since CC1 differs from the TA of CC2, the PUCCH symbol (denoted as symbol) in subframe n on CC1) And PUSCH (denoted as PUSCH) in subframe n on CC2) The symbols partially overlap.

If the sum of the transmission power of the PUCCH on CC1 in subframe n and the transmission power of the PUSCH on CC2 in subframe n +1 exceeds the maximum transmission power configured by the UE.

In this case, if the priority scheme is scheme 4, the priority of the PUCCH on CC1 is higher than that of the PUSCH on CC 2.

The UE first reduces the PUSCH transmit power on CC2 in subframe n +1 and then reduces the PUCCH transmit power on CC1 in subframe n until the sum of the PUCCH transmit power on CC1 in subframe n and the PUSCH transmit power on CC2 in subframe n +1 does not exceed the maximum transmit power configured by the UE. The UE then sends the PUCCH on CC1 with the PUSCH on CC 2.

Examples 2 to 5

In this case, if the priority scheme is the scheme 5, the PUSCH on CC2 has higher priority than the PUCCH on CC 1.

The UE first reduces PUCCH transmit power on CC1 in subframe n +1 and then reduces PUSCH transmit power on CC2 in subframe n until the sum of the PUCCH transmit power on CC1 in subframe n and the PUSCH transmit power on CC2 in subframe n +1 does not exceed the UE configured maximum transmit power. The UE then sends the PUCCH on CC1 with the PUSCH on CC 2.

Examples 2 to 6

As shown in fig. 9, in subframe n, CC1 needs to transmit PUCCH and CC2 needs to transmit PUSCH. Since CC1 differs from the TA of CC2, the PUCCH symbol (denoted as symbol) in subframe n on CC1) And PUSCH (denoted as PUSCH) in subframe n on CC2) The symbols are partially overlapped, and the overlapped symbols are marked as

The eNB signals the UE to perform power reduction in equal proportion on the transmission power of the PUCCH on CC1 and the transmission power of the symbol where the PUSCH on CC2 overlaps; or

And the UE performs equal-proportion power reduction on the transmission power of the symbols overlapped by the uplink channels on all the carriers according to a predefined rule 3.

The UE performs an equal proportional reduction of the transmit power of the symbols overlapped in the PUCCH on CC1 and PUSCH on CC2 until the sum of the transmit power of the symbols overlapped by the PUCCH on CC1 and PUSCH on CC2 does not exceed the maximum transmit power configured by the UE, and then the UE simultaneously transmits the PUCCH on CC1 and PUSCH on CC 2.

Examples 2 to 7

The eNB signals the UE to perform power reduction on the transmission power of the symbols with the transmission power of the PUCCH on the CC1 and the PUSCH on the CC2 overlapping according to the priority; or

And the UE performs power reduction on the transmission power of the symbols overlapped by the uplink channels on all the carriers according to a predefined rule 3 according to priority.

The UE first reduces the transmit power of the overlapped symbols in the PUSCH on CC2 and then reduces the transmit power of the overlapped symbols in the PUCCH on CC1 until the sum of the transmit power of the overlapped symbols in the PUCCH on CC1 and the transmit power of the overlapped symbols in PUSCH on CC2 does not exceed the maximum transmit power configured by the UE. The UE then sends the PUCCH on CC1 with the PUSCH on CC 2.

Examples 2 to 8

As shown in FIG. 9, in subframe n, CC1 needs to transmit PUCCH, CC2 requires transmission of PUSCH. Since CC1 differs from the TA of CC2, the PUCCH symbol (denoted as symbol) in subframe n on CC1) And PUSCH (denoted as PUSCH) in subframe n on CC2) The symbols are partially overlapped, and the overlapped symbols are marked as

Examples 2 to 9

As shown in fig. 10, in subframe n, CC1 needs to transmit PUCCH, and in subframe n +1, CC2 needs to transmit PUSCH. Due to CC1 and CC2Is different, so the PUCCH symbol (denoted as PUCCH symbol in subframe n on CC 1) is in subframe n) And PUSCH (denoted as PUSCH) in subframe n +1 on CC2) The symbols are partially overlapped, and the overlapped symbols are marked as

In this case, if the priority scheme is the scheme 4, the priority of the PUCCH on CC1 in subframe n is higher than the priority of the PUSCH on CC2 in subframe n + 1.

The UE first reduces the transmit power of the overlapping symbols in the PUSCH on CC2 in subframe n +1 and then reduces the transmit power of the overlapping symbols in the PUCCH on CC1 in subframe n until the sum of the transmit power of the overlapping symbols in the PUCCH on CC1 in subframe n and the transmit power of the overlapping symbols in the PUSCH on CC2 in subframe n +1 does not exceed the UE configured maximum transmit power. The UE then sends the PUCCH on CC1 with the PUSCH on CC 2.

Examples 2 to 10

As shown in fig. 10, in subframe n, CC1 needs to transmit PUCCH, and in subframe n +1CC2 requires transmission of PUSCH. Since CC1 differs from the TA of CC2, the PUCCH symbol (denoted as symbol) in subframe n on CC1) And PUSCH (denoted as PUSCH) in subframe n +1 on CC2) The symbols are partially overlapped, and the overlapped symbols are marked as

In this case, if the priority scheme is the scheme 5, the PUSCH on CC2 in subframe n +1 has higher priority than the PUCCH on CC1 in subframe n.

The UE first reduces the transmit power of the overlapping symbols in the PUCCH on CC1 in subframe n and then reduces the transmit power of the overlapping symbols in the PUSCH on CC1 in subframe n +1 until the sum of the transmit power of the overlapping symbols in the PUCCH on CC1 in subframe n and the transmit power of the overlapping symbols in the PUSCH on CC2 in subframe n +1 does not exceed the UE configured maximum transmit power. The UE then sends the PUCCH on CC1 with the PUSCH on CC 2.

In addition, the embodiment of the present invention further provides a device for reducing uplink signal power in a carrier aggregation system, the device mainly includes a transmission power determining unit and a power reduction indicating unit in a base station, and a power reduction executing unit in a UE, wherein:

In addition, an uplink signal power reduction device in a carrier aggregation system is also provided in the embodiments of the present invention, where the device mainly includes a transmit power determination module and a transmit power reduction module in a UE, where:

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

Claims

1. A method for reducing uplink signal power in a carrier aggregation system,

The base station indicates the UE to reduce the transmitting power of an uplink channel with time domain symbols overlapped front and back on different carriers;

the base station indicates a predefined rule for the UE power reduction; the predefined rule includes: the UE reduces the transmitting power of the uplink channel with the time domain symbols overlapped front and back on different carriers according to a predefined rule indicated by the base station; proportionally reducing the transmitting power of an uplink channel of each uplink carrier until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; or, sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; or, only the transmission power of the overlapped symbols on different channels is reduced;

or,

the base station indicates the UE power reduction mode and/or a power reduction object; wherein the power reduction mode includes: carrying out equal-proportion reduction on the transmitting power of each uplink channel; sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high; the power curtailment object comprising: all uplink channels; an uplink channel is designated.

2. The method of claim 1,

the priority of the uplink channel is established in a mode of combining one or more of the following modes:

if the uplink channel with overlapped front and back symbols in the time domain is a plurality of PUSCHs, establishing the priority according to whether UCI is carried, wherein the priority is from high to low: PUSCHs carrying UCI and PUSCHs not carrying UCI;

3. The method of claim 1 or 2,

and the base station indicates the UE to reduce the transmitting power of the uplink channel with the time domain symbols overlapped front and back on different carriers through physical layer signaling or high layer signaling.

4. A method for reducing uplink signal power in a carrier aggregation system,

the UE is configured with a plurality of timing advances, when time domain symbols between uplink channels carried by different carriers are not aligned and the time domain symbols on different carriers are overlapped front and back, if the sum of the transmitting power of each uplink channel of the UE is judged to exceed the maximum transmitting power configured by the UE, the UE is configured with a plurality of timing advances

UE reduces the transmitting power of the uplink channel with the overlapped time domain symbols on different carriers according to a predefined rule;

the predefined rule includes: proportionally reducing the transmitting power of an uplink channel of each uplink carrier until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; or, sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; alternatively, only the transmit power of the symbols that overlap on different channels is reduced.

5. The method of claim 4,

when only the transmission power of the symbols overlapped on the different channels is reduced, the transmission power of the symbols overlapped is reduced in equal proportion, or the power of the symbols overlapped on the different channels is reduced according to the sequence of the priority of the uplink channel corresponding to the symbols overlapped from low to high.

6. The method of claim 4,

the UE judges whether the sum of the transmitting power of each uplink channel exceeds the maximum transmitting power configured by the UE according to one of the following modes:

7. The method according to claim 4 or 5, wherein the priority of the uplink channel is established in a manner of one or more of the following combinations:

8. An apparatus for reducing uplink signal power in a carrier aggregation system, the apparatus comprising a transmission power determining unit and a power reduction instructing unit in a base station, and a power reduction performing unit in a UE, wherein:

the power reduction execution unit is used for reducing the transmitting power of the uplink channel with time domain symbols overlapped front and back on different carriers according to the indication of the base station;

the power reduction indication unit is used for indicating a predefined rule of the UE power reduction; the power reduction execution unit is used for reducing the transmitting power of the uplink channel with the overlapped time domain symbols on different carriers according to the predefined rule indicated by the power reduction indication unit; wherein the predefined rule comprises: proportionally reducing the transmitting power of an uplink channel of each uplink carrier until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; or, sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; or, only the transmission power of the overlapped symbols on different channels is reduced;

or,

the power reduction instruction unit is configured to instruct the UE power reduction mode and/or a power reduction target; the power reduction execution unit is used for reducing the transmitting power of the power reduction object according to the power reduction mode indicated by the power reduction indication unit; wherein the power reduction mode includes: carrying out equal-proportion reduction on the transmitting power of each uplink channel; sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high; the power curtailment object comprising: all uplink channels; an uplink channel is designated.

9. The apparatus of claim 8,

and the transmitting power judging unit is used for judging that the sum of the transmitting power of each uplink channel of the UE exceeds the maximum transmitting power configured by the UE when receiving the notice that the UE is in the power limited state.

10. The apparatus of claim 8,

the power reduction indicating unit is used for indicating the UE to reduce the transmitting power of the uplink channel with the time domain symbols overlapped front and back on different carriers through physical layer signaling or high layer signaling.

11. An apparatus for reducing uplink signal power in a carrier aggregation system, the apparatus comprising a transmit power determining module and a transmit power reducing module in a UE, wherein:

the transmission power reduction module is used for reducing the transmission power of the uplink channel with time domain symbols overlapped front and back on different carriers according to a predefined rule if the transmission power judgment module judges that the sum of the transmission power of each uplink channel of the UE exceeds the maximum transmission power configured by the UE;

the transmission power reduction module is used for reducing the transmission power of the uplink channel with time domain symbols overlapped front and back on different carriers according to the following predefined rules: proportionally reducing the transmitting power of an uplink channel of each uplink carrier until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; or, sequentially reducing the power of each uplink channel according to the sequence of the priority of the uplink channel from low to high until the transmitting power of the UE does not exceed the maximum transmitting power configured by the UE; alternatively, only the transmit power of the symbols that overlap on different channels is reduced.

12. The apparatus of claim 11,

when the transmission power reduction module only reduces the transmission power of the symbols which are overlapped on different channels, the transmission power of the symbols which are overlapped is reduced in an equal proportion, or the symbols which are overlapped on different channels are reduced in power according to the sequence of the priority of the uplink channel corresponding to the symbols which are overlapped from low to high.

13. The apparatus of claim 11 or 12,

the transmission power reduction module is used for judging whether the sum of the transmission power of each uplink channel exceeds the maximum transmission power configured by the UE according to one of the following modes: