CN102387580B

CN102387580B - The report method of the power headroom reporting that carrier wave is corresponding and system

Info

Publication number: CN102387580B
Application number: CN201010268988.1A
Authority: CN
Inventors: 夏树强; 田金风; 金圣尧; 胡宏林
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-08-30
Filing date: 2010-08-30
Publication date: 2015-08-12
Anticipated expiration: 2030-08-30
Also published as: CN102387580A

Abstract

The invention discloses the report method of power headroom reporting corresponding to a kind of carrier wave, the method comprises: subscriber equipment (UE) reports by component carrier the power headroom reporting (PHR) that each component carrier is corresponding; Wherein, report in the process of PHR, the computing formula of power climbing space (PH) value reported is: wherein, for UE is at component carrier c _jthe upper maximum power that can use; for UE is at component carrier c _jthe gross power of the uplink physical channel of upper use.The invention also discloses the reporting system of power headroom reporting corresponding to a kind of carrier wave, this system comprises and reports unit, reports the PHR that each component carrier is corresponding for UE by component carrier.Adopt method and system of the present invention, total transmitting power that UE side can be avoided to calculate is more than the problem of UE maximum transmission power.

Description

Method and system for reporting power headroom report corresponding to carrier

Technical Field

The present invention relates to reporting technologies, and in particular, to a method and a system for reporting a Power Headroom Report (PHR) corresponding to a carrier under a multi-carrier condition.

Background

With the development of the mobile communication industry, the demand for mobile data services is increasing, and the demand for mobile communication speed and quality of service (Qos) is also increasing. Thus, before third generation mobile communications (3G) has not been commercialized on a large scale, research and development work has been initiated on next generation mobile communication systems, of which the third generation partnership project (3GPP) initiated Long Term Evolution (LTE) project is more typical. The highest spectral bandwidth that can be provided by an LTE system is 20 megahertz (MHz). With the further evolution of the network, an evolved long term evolution (LTE-a) is introduced, which, as an LTE evolved system, can provide a spectrum bandwidth up to 100MHz, can support more flexible and higher quality communications, and has good backward compatibility. In an LTE-a system, there are multiple Component Carriers (CCs), one LTE terminal can only operate on a certain CC that is backward compatible, and an LTE-a terminal with a strong capability can simultaneously transmit on multiple CCs.

In LTE R8/R9, to assist an enhanced base station (eNB) in scheduling, more reasonably perform Physical Resource Block (PRB) allocation, Physical Uplink Shared Channel (PUSCH) Modulation and Coding Scheme (MCS) selection, and Uplink power control adjustment, a User Equipment (UE) side indicates how much remaining available power information remains on a carrier Resource by reporting PHR, which is defined as: maximum transmit power minus PUSCH power. In R10, each CC has its own power adjustment amount, so that in LTE-a, it has been agreed to modify PHR to report on CC, that is, each CC has PHR corresponding to the CC to report. For the case where a Physical Uplink Control Channel (PUCCH) is supported in R10 for simultaneous transmission with the PUSCH, the PHR uses a new type, i.e., type 2: subtracting the sum of PUCCH power and PUSCH power from the maximum transmitting power corresponding to the CC; for the case of PUSCH-only transmission on CC, the PHR is still defined as R8, i.e. type 1: and subtracting the PUSCH power from the maximum transmission power corresponding to the CC. However, when uplink carriers are aggregated, the simultaneous transmission of PUCCH and PUSCH may cause Maximum Power Reduction (MPR), and there is a company that suggests to include this maximum power reduction amount in the maximum transmission power corresponding to a CC, that is, the maximum transmission power corresponding to the CC is modified by MPR, and then the calculated PHR corresponding to the CC may more accurately reflect Power Headroom (PH) information. Thus, the maximum transmission power corresponding to the CC is less than or equal to the maximum transmission power of the UE, and different uplink CCs may have different maximum transmission powers corresponding to the CCs. For the relationship between the PHR and the PH, the PHR is a process, which may be referred to as a process of reporting the PHR to the base station by the UE, but the specific content reported is the PH value, that is, reporting the PHR is actually equivalent to reporting the PH value, and is not described in detail.

For the situation of aggregation of multiple uplink CCs, when the eNB allocates resources according to the PHR corresponding to the CCs, it can only ensure that the power used by the resources allocated on one uplink CC does not exceed the maximum transmit power of the UE, and cannot ensure that the total power corresponding to the resources allocated on the multiple uplink CCs to be aggregated does not exceed the maximum transmit power of the UE. Therefore, the eNB may also want to know the power information currently remaining in the UE in other manners besides the PHR corresponding to the CC. If the eNB does not know the current remaining power information of the UE, it may cause the eNB to allocate inappropriate resources to the UE during scheduling allocation, thereby causing a problem that the total transmit power required to be used on each CC calculated by the UE side exceeds the maximum transmit power of the UE. In order to ensure that the total transmission power of the UE side does not exceed the maximum transmission power of the UE, the UE side needs to perform power scaling frequently, and the reliability of data transmission may be affected every time power scaling is performed, so the operation of power scaling is avoided as much as possible. It can be seen that: in order to ensure that the eNB allocates appropriate resources to the UE and the total transmit power of the UE side does not exceed the maximum transmit power of the UE, the eNB needs to acquire the current remaining power information of the UE, in addition to reporting the information of the power headroom on each uplink CC of the UE to the eNB.

In order to solve the above problems, one solution in the prior art is: when multiple uplink CCs are aggregated, in addition to reporting the PHR corresponding to the carrier on the subframe i, a PHR corresponding to the UE needs to be additionally reported, where PH (i) ═ P_CMAX-P_UE(i) Here P_CMAXIs the maximum transmit power, P, of the UE_UE(i) Is the sum of the estimated power of each physical uplink channel of all scheduled uplink CCs in the subframe i. The PHR corresponding to the UE is a power multiple relation with the total power used by the UE on all scheduled uplink CCs as a reference point, and the PHR corresponding to the CC is a power multiple relation with the power used by the UE on the corresponding uplink CC as a reference point. However, with this solution there are drawbacks: since there are only the two pieces of relative power information, it is difficult for the eNB to restrict the resource allocated to the PHR information corresponding to the CC with a power margin relative to the total power used on all scheduled uplink CCs. Therefore, if the PHR corresponding to the UE is used as the UE maximum transmit power constraint item, the eNB also wants to know the transmit power of the UE side on each scheduling uplink CC, and whether the information is valid to be evaluated or not, that is, the eNB needs to rely additionally on the transmit power of the UE side on each scheduling uplink CC to perform the constraint effectively, but because whether the information is valid to be evaluated or not, the information has uncertainty, the problem that the total transmit power calculated by the UE side exceeds the UE maximum transmit power may still be caused. In addition, the reporting method that requires additional information besides the PH value increases the signaling load.

In order to solve the above problem, another solution of the prior art is: and according to the PH value reported by the CC, taking the minimum value between the PH value corresponding to the CC and the PH value corresponding to the UE. However, with this solution there are drawbacks: because the reporting mode only considers that the PH value on one uplink CC is restricted by the maximum transmission power of the UE, when a plurality of uplink CCs are aggregated, the problem that the total transmission power calculated by the UE side exceeds the maximum transmission power of the UE still can be caused. In summary, with both of the above solutions of the prior art, the problem that the total transmit power calculated by the UE side exceeds the maximum transmit power of the UE cannot be avoided.

Disclosure of Invention

In view of this, the main objective of the present invention is to provide a method and a system for reporting a PHR corresponding to a carrier, which can avoid a problem that a total transmit power calculated by a UE side exceeds a maximum transmit power of the UE.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method for reporting a power headroom report corresponding to a carrier comprises the following steps: user Equipment (UE) reports a Power Headroom Report (PHR) corresponding to each component carrier according to the component carriers;

in the reporting process of the PHR, a calculation formula of a reported Power Headroom (PH) value is as follows:wherein,for UE on component carrier c_jThe maximum power that can be used;for UE on component carrier c_jTotal power of uplink physical channels used above.

Wherein, theThe calculation formula of (2) is as follows:wherein,is a component carrier c_jThe maximum transmit power of;for UE maximum transmit power in component carrier c_jUp distributed power and satisfyP_UE，maxDenotes the UE maximum transmit power and N denotes the number of aggregated component carriers.

Wherein, theThe calculation formula of (2) is as follows:wherein,for UE total remaining power in component carrier c_jThe power obtained.

Wherein, theThe calculation formula of (2) is as follows: are weighting coefficients.

Wherein, theThe calculation formula of (2) is as follows:

a system for reporting a power headroom report corresponding to a carrier, the system comprising: a reporting unit, configured to report, by the UE, the PHR corresponding to each component carrier according to the component carrier;

wherein, in the process of reporting the PHR,the reported calculation formula of the PH value is as follows:wherein,for UE on component carrier c_jThe maximum power that can be used;for UE on component carrier c_jTotal power of uplink physical channels used above.

Wherein, this system still includes: a calculation unit for calculating the PHThe above-mentionedThe calculation formula of (2) is as follows:wherein,is a component carrier c_jThe maximum transmit power of;for UE maximum transmit power in component carrier c_jUp distributed power and satisfyP_UE，maxDenotes the UE maximum transmit power and N denotes the number of aggregated component carriers.

Wherein the computing unit is further used for computing theTime calculating theThe above-mentionedThe calculation formula of (2) is as follows:wherein,for UE total remaining power in component carrier c_jThe power obtained.

Wherein the computing unit is further used for computing theTime calculating theThe above-mentionedThe calculation formula of (2) is as follows: are weighting coefficients.

Wherein the computing unit is further used for computing theThe calculation formula adopted is as follows:

the UE reports PHR corresponding to each carrier according to component carriers; in the process of reporting the PHR, the calculation formula of the reported PH value is as follows:wherein,for UE on component carrier c_jThe maximum power that can be used;for UE on component carrier c_jTotal power of uplink physical channels used above.

By adopting the method and the device, the PH value calculation mode during reporting the PHR reflects the PHR requirement of the eNB on each CC of the UE side due to the consideration of the limitation of the maximum transmission power of the UE, so that the problem that the total transmission power calculated by the UE side exceeds the maximum transmission power of the UE is avoided, and no additional signaling overhead is added.

Drawings

FIG. 1 is a diagram illustrating power information according to example 1;

FIG. 2 is a diagram illustrating power information according to example 2;

fig. 3 is a diagram illustrating power information according to embodiment 3.

Detailed Description

The basic idea of the invention is: reporting PHR corresponding to each component carrier by UE according to the component carriers; in the process of reporting the PHR, the calculation formula of the reported PH value is as follows:wherein,for UE on component carrier c_jThe maximum power that can be used;for UE on component carrier c_jTotal power of uplink physical channels used above.

The following describes the embodiments in further detail with reference to the accompanying drawings.

A reporting method of PHR corresponding to a carrier mainly comprises the following contents:

and the UE reports the PHR corresponding to each component carrier according to the component carriers.

In the process of reporting the PHR, the calculation formula of the reported PH value is as follows:wherein,for UE on component carrier c_jThe maximum power that can be used is the maximum transmission power P of the UE_UE，maxAnd component carrier c_jMaximum transmission power ofA function of (a);for UE on component carrier c_jTotal power of uplink physical channels used above.

Further, when the eNB allocates resources to the multiple component carriers according to the PHR corresponding to each component carrier, the total transmit power of the UE side, which is calculated according to the resources allocated to the multiple component carriers, does not exceed the maximum transmit power of the UE.

Further, the air conditioner is provided with a fan,the calculation formula of (2) is as follows:wherein,is a component carrier c_jThe maximum transmit power of;for UE maximum transmit power in component carrier c_jUp distributed power and satisfyP_UE，maxDenotes the UE maximum transmit power and N denotes the number of aggregated component carriers.

Further, the air conditioner is provided with a fan,the calculation formula of (2) is as follows:wherein,for UE total remaining power in component carrier c_jThe power obtained.

Further, the air conditioner is provided with a fan,the calculation formula of (2) is as follows: are weighting coefficients.

Further, it is possible, optionally,the calculation formula of (2) is as follows:

further, for the power back-off case, the UE side may be as described aboveIs calculated byTo more accurately reflect the PH. For example, assume a power backoff value ofThen is availableThe obtained value replaces the above calculation formulaValue of

In summary, in the first solution of the prior art, in addition to reporting the PHR corresponding to the carrier, extra current remaining power information of the UE needs to be reported, and the calculation of the PH value in the process of reporting the PHR corresponding to the carrier is not scientific, and the problem of MPR is not considered, so that the problem that the total transmit power calculated by the UE side exceeds the maximum transmit power of the UE cannot be effectively avoided, and the problem of power scale reduction caused by the resource allocation exceeding the maximum transmit power limit of the UE cannot be avoided, and the extra information needs to be transmitted by an extra cell, thereby greatly increasing signaling overhead. The second solution in the prior art reports the PHR corresponding to the carrier, the calculation of the PH value during reporting the PHR corresponding to the carrier is not scientific, only considering that the PH value is constrained by the maximum transmit power of the UE for the PH value of the PHR corresponding to one carrier, and the problem that the total transmit power calculated by the UE side exceeds the maximum transmit power of the UE cannot be effectively avoided. However, the solution of the present invention is different from the first and second solutions in the prior art, the reporting of the PH value in the PHR process corresponding to the carrier is scientific because the problem causing the MPR is considered in advance, and the PH value is not limited by the maximum transmit power of the UE with respect to the PH value of the PHR corresponding to only one carrier, and no additional information, such as the current remaining power information of the UE, needs to be reported except for reporting the PHR corresponding to the carrier, so that the requirements of the eNB for the PHR corresponding to each CC of the UE side are reflected under the limitation of the maximum transmit power of the UE, and the problem that the total transmit power calculated by the UE side exceeds the maximum transmit power of the UE can be avoided, thereby effectively avoiding the problem of power scale reduction caused by the resource allocation exceeding the maximum transmit power limit of the UE, and adding no additional signaling overhead.

The scheme of the invention is particularly suitable for an LTE-A system, and is not only suitable for the situation during non-carrier aggregation, but also suitable for the situation during uplink carrier aggregation.

The invention is illustrated below.

In the following examples, the weighting factors are all as followsThe description is given for the sake of example.

Example 1:

assuming that the carrier used by the user in uplink in the LTE-a cell is CC1, no carrier aggregation, as shown in fig. 1, it is assumed that there is a case of MPR and the value is already reflected in the maximum transmission power corresponding to the carrier, whereIs less than the maximum transmit power of the UE, the power of the UE on carrier 1And (4) showing. According to the calculation formula of the weighting coefficient, when only one uplink carrier is used, the time isThe power of the UE total residual power divided by the carrier 1 is the UE total residual powerThe maximum transmit power of the UE is thus allocated on carrier 1 with the following power:i.e., the maximum transmit power of the UE, therefore, there areAt this time, the PHR reported by carrier 1 isThe PHR report value is the same as that in R8/R9, so backward compatibility is satisfied.

Example 2:

suppose that carriers aggregated by users in uplink in an LTE-a cell are CC1 and CC2, as shown in fig. 2, power information of component carrier 1 and component carrier 2 and UE are given respectively. The maximum transmission power corresponding to the component carrier 1 is smaller than the maximum transmission power of the UE, and the maximum transmission power corresponding to the component carrier 2 is smaller than the maximum transmission power corresponding to the component carrier 1.Representing the UE power on component carrier 1 and component carrier 2, respectively. Sum of remaining milliwatt power calculated according to carrier capability on each scheduling CC in this embodimentGreater than the remaining milliwatt power calculated from the UE capabilityUE side on known P is described further below_UE，max、Andhow to report the PHR on each CC.

According to P_UE，max、The UE total remaining power may be calculated:in milliwatts, and, likewise, according to the formula of the weighting coefficientsA weighting factor may be calculated. UE total remaining power in component carrier c_jThe divided power satisfiesConverting the power information with the dBm as a unit into a milliwatt unit, and adding the milliwatt power calculated by the UE on the corresponding component carrier wave to obtain the component carrier wave c according to the maximum transmitting power of the UE_jThe power converted into dBm unit is the upper distributed milliwatt powerSubstituting weighting coefficientsIn the calculation formula of (2), it can be seen that the sum of the remaining milliwatt power calculated according to the component carrier capacity on each scheduling CC is only required to be calculatedGreater than the remaining milliwatt power calculated from the UE capabilityThat is, the power headroom corresponding to the CC needs to be limited according to the maximum transmission power of the UE capability, thenAlways less than the residual power calculated on the corresponding component carrier according to the carrier capabilityAs shown in figure 2 of the drawings, in which, thus is provided withAndthus, PHR reported on CC1 and CC2 are

Example 3:

assuming that the component carriers aggregated in uplink by users in the LTE-a cell are CC1 and CC2, as shown in fig. 3, this embodiment provides a case when the sum of the remaining milliwatt powers calculated according to the carrier capability on each scheduling CC is less than the remaining milliwatt power calculated according to the UE capability, at this time, the UE maximum transmit power constraint is satisfied, and the expression indicates that there are some remaining milliwatt powersReuse ofCan obtainIt means that the total remaining power of the UE is in component carrier c_jThe power of the milliwatt is larger than that of the component carrier c calculated according to the carrier capacity_jThe remaining milliwatt power of (1), in other words, satisfyThus, according to the scheme of the present invention, in each CC in embodiment 3, the reported PHR is exactly the PHR corresponding to the CC calculated according to the carrier capability:

a reporting system of PHR corresponding to a carrier wave comprises: and the reporting unit is used for reporting the PHR corresponding to each component carrier by the UE according to the component carriers. In the process of reporting the PHR, the calculation formula of the reported PH value is as follows:wherein,for UE on component carrier c_jThe maximum power that can be used is the maximum transmission power P of the UE_UE，maxAnd component carrier c_jMaximum transmission power ofA function of (a);for UE on component carrier c_jTotal power of uplink physical channels used above.

Here, the system further includes: a calculation unit for calculating when the PH is calculatedThe calculation formula of (2) is as follows:wherein,is a component carrier c_jThe maximum transmit power of;for UE maximum transmit power in component carrier c_jUp distributed power and satisfyP_UE，maxDenotes the UE maximum transmit power and N denotes the number of aggregated component carriers.

Here, the calculation unit is further adapted to calculateTime of day calculationThe calculation formula of (2) is as follows:wherein,for UE total remaining power in component carrier c_jThe power obtained.

Here, the calculation unit is further adapted to calculateTime of day calculationThe calculation formula of (2) is as follows: is a weighting systemAnd (4) counting.

Here, the calculation unit is further adapted to calculateThe calculation formula adopted is as follows:

the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A method for reporting a power headroom report corresponding to a carrier is provided, and the method comprises: user Equipment (UE) reports a Power Headroom Report (PHR) corresponding to each component carrier according to the component carriers;

in the reporting process of the PHR, a calculation formula of a reported Power Headroom (PH) value is as follows:wherein,for UE on component carrier c_jThe maximum power that can be used in the above,wherein,is a component carrier c_jThe maximum transmit power of;for UE maximum transmit power in component carrier c_jUp distributed power and satisfyP_UE,maxRepresenting the maximum transmission power of the UE, and N representing the number of aggregated component carriers;for UE on component carrier c_jTotal power of uplink physical channels used above.

2. The method of claim 1, wherein the step of applying the coating comprises applying a coating to the substrateThe calculation formula of (2) is as follows:wherein,for UE total remaining power in component carrier c_jThe power obtained.

3. The method of claim 2, wherein the step of generating the second signal comprises generating a second signal based on the first signal and the second signalThe calculation formula of (2) is as follows:

are weighting coefficients.

4. The method of claim 3, wherein the step of applying the coating comprises applying a coating to the substrateThe calculation formula of (2) is as follows:

5. a system for reporting a power headroom report corresponding to a carrier, the system comprising: a reporting unit, configured to report, by the UE, a power headroom report PHR corresponding to each component carrier according to the component carrier;

in the reporting process of the PHR, a calculation formula of the reported power headroom PH value is as follows:wherein,for UE on component carrier c_jThe maximum power that can be used in the above,wherein,is a component carrier c_jThe maximum transmit power of;the power allocated on the component carrier cj for the maximum transmission power of the UE and satisfiesP_UE,maxRepresenting the maximum transmission power of the UE, and N representing the number of aggregated component carriers;for UE on component carrier c_jTotal power of uplink physical channels used above.

6. The system of claim 5, wherein the computing unit is further configured to compute theTime calculating theThe above-mentionedThe calculation formula of (2) is as follows:wherein,for UE total remaining power in component carrier c_jThe power obtained.

7. The system of claim 6, wherein the computing unit is further configured to compute theTime calculating theThe above-mentionedThe calculation formula of (2) is as follows:

are weighting coefficients.

8. The system of claim 7, wherein the computing unit is further configured to compute theThe calculation formula adopted is as follows: