CN103533628B - A kind of downlink power distributing method - Google Patents

Abstract

The present application discloses a downlink power allocation method, including: A. According to the cell-level parameter P _B configured by the high-level layer, and according to the principle of maximizing base station power efficiency, determine the initial configuration value of the user-level parameter P _A of each user in the cell; B. By considering the status information of each user, establish a resource and power adjustment relationship table for users who need to increase power and users who need to lower power; in the resource and power adjustment relationship table, the element values in the first row correspond to users who need to lower power P _A value, the element value in the first column corresponds to the P _A value of the user who needs to increase the power, and the horizontal and vertical cross elements are the ratio of the number of user resource blocks to be adjusted and the number of user resource blocks to be adjusted; C, according to the resource and power adjustment relationship table Redistribute the PA value of each user _. The technical solution of the application can ensure that the power of the base station is fully utilized to avoid overflow or waste, and at the same time, it can also reduce the fluctuation range of the signal received by the user terminal and reduce the requirements for the terminal power amplifier.

Description

A method of downlink power allocation

technical field

The present application relates to the technical field of mobile communication, in particular to a long-term evolution project (LTE, Long Term Evolution), and in particular to a method for allocating downlink power.

Background technique

Unlike Time Division Synchronous Code Division Multiple Access (TD-SCMA), the downlink of the LTE system has no power control mechanism, and detailed power adjustment cannot be performed according to the channel state during communication. In the LTE system, data is transmitted at maximum power. Therefore, when performing downlink data transmission, it is very necessary and important to determine the power of each resource element (RE, ResourceElement) for each user.

According to the 3rd Generation Partnership Project (3GPP) standard document 36.213, downlink power allocation is mainly related to three high-level configuration parameters: reference signal power (Reference-signal-power) P _CRS , PA and _{P B .} The reference signal power P _CRS represents the transmission energy (EPRE, EnergyPerResourceElement) of a single resource element on each port of the cell reference signal (CRS, Cell-specificReferenceSignal); P _B is related to the ratio ρ _B /ρ _A , and these two parameters are cell-level Parameter, P _A determines the value of ρ _A , in a non-multi-user scenario, ρ _{A =} PA, which is a user-level parameter. ρ _A and ρ _B are intermediate quantities used for power allocation, which represent the ratio of traffic channel data resource particle power (PDSCHEPRE) to reference signal resource particle power (CRSEPRE), where ρ _A is the ratio on non-CRS symbols, and ρ _B is the ratio on the CRS sign.

Table 1 shows the cell-level parameters P _B and ρ _B /ρ _A for the case of 1, 2 or 4 antenna ports. It can be seen that there are only four possible values of P _B : 0, 1, 2, and 3. For a fixed number of antenna ports, there are only four possible values for ρ _B /ρ _A.

Table 1

Figure 1 shows different Orthogonal Frequency Division Multiplexing (OFDM) symbols in resource blocks (RB, ResourceBlock), where each row represents a time slot, each column represents a subcarrier, and each square represents an OFDM symbol. Also corresponds to a RE. The box marked with shade or R1 in Fig. 1 indicates that the OFDM symbol carries a reference signal.

Power values on REs at different locations can be obtained through the three parameters P _CRS , PA, and _{P B configured} by the high layer, and the total power of the base station.

In the prior art, for downlink power allocation, the LTE system generally adopts a solution of fixed parameter configuration, or performs simple association, and each antenna port uses fixed power for transmission. For example, for the configuration of two antenna ports, P _CRS , PA and _{P B are} generally fixedly configured according to certain criteria, so that the transmit power of each resource element of each antenna port of different users on the entire bandwidth is relatively fixed.

The downlink power allocation method of the LTE system in the prior art has the following disadvantages:

1. If the reference signal power configuration is high, it may cause power overflow on a certain OFDM symbol, exceeding the maximum transmission power range; if the configuration is low, the power of the base station may not be fully utilized, affecting the performance of the system, especially the edge users.

2. Different user positions, characteristics of each transmission channel, etc. cannot be well considered. Even if the power configuration of the reference signal just guarantees full power transmission, due to the different channel conditions of each user, the actual required power is different, and the same power configuration will affect the overall performance of the system, and may also cause fluctuations in the level value reaching different user terminals Larger, increasing terminal overhead.

Contents of the invention

The present application provides a downlink power allocation method, which can ensure that the power of the base station is fully utilized and avoids overflow or waste. At the same time, it can also reduce the fluctuation range of the received signal of the user terminal and reduce the requirements for the terminal power amplifier.

A downlink power allocation method provided by an embodiment of the present invention includes:

A. Determine the initial configuration value of the user-level parameter P _A of each user in the cell according to the cell-level parameter P _B configured by the high-level layer and according to the principle of maximizing base station power efficiency;

B. By considering the status information of each user, establish a resource and power adjustment relationship table for users who need to increase power and users who need to lower power; in the resource and power adjustment relationship table, the element values in the first row correspond to users who need to lower power P _A value, the element value in the first column corresponds to the P _A value of the user who needs to increase the power, and the horizontal and vertical cross elements are the ratio of the number of resource blocks for the user who is up-regulated to the number of resource blocks for the user who is down-regulated;

C. Redistribute the PA value of each user according to the resource and power adjustment relationship table _.

In step _A , the base station power efficiency maximization principle is used to determine the initial configuration value of the user-level parameter PA of each user in the cell: adjust the base station transmission power according to a certain adjustment step size, and continuously measure the base station power efficiency, When the power efficiency of the base station _{reaches a} maximum value, the corresponding PA is used as the user's initial PA configuration value.

Preferably, the adjustment step size is 2dB or 3dB.

Preferably, in step _C , redistributing the PA value of each user according to the resource and power adjustment relationship table includes:

C1. Obtain the currently configured cell-level parameter P _B ;

C2. Determine the estimated P _CRS according to the total power of the base station;

C3, sort all users in the cell according to the reported reference signal received power RSRP from high to low, and obtain a user queue;

C4. Selecting the first user and the tail user from the first and last ends of the user queue respectively for pairing;

C5. Determine whether the RSRP difference between the paired users is smaller than the preset first threshold, if so, consider that the power difference between the users is small and does not need to be adjusted, and end this process; otherwise, execute step C6;

C6. According to the proportional relationship of the number of resource blocks allocated to the paired users, query the resource and power adjustment relationship table, and perform power redistribution to the paired users according to the query results; the absolute value of the power reduction of the first user and the absolute power increase of the tail user The ratio of values is equal to the result obtained by said query;

C7. Determine whether power redistribution has been performed for all users in the cell, and if so, end this process; otherwise, return to step C4.

Preferably, in step C4, selecting the first user and the last user from the first and last ends of the user queue for pairing includes:

Pairing multiple users at the head end of the user queue with one user at the tail end, or pairing one user at the head end of the user queue with multiple users at the tail end.

Preferably, the first threshold is 3dB.

Preferably, after step _C , it further includes: comparing the user's PA with the second threshold, and if it is less than the second threshold, lowering the user's PA by N ₂ dB _; if it is greater than the second threshold, _lowering the user's PA by N ₁ dB, where N ₁ and N ₂ are setting values related to the actual scene and equipment.

It can be seen from the above technical solutions that in order to ensure the fairness of each user, the power parameter PA is reasonably configured according to the state of the user _. For users with poor channel conditions, a slightly larger PA can be configured to ensure the receiving performance of the UE; for users with good channel conditions, a slightly smaller P _A can be configured under the condition that the user performance is not greatly affected. _A , to save power and reduce the hardware processing overhead of the terminal, which can also reduce the fluctuation range of the signal received by the user terminal and reduce the requirements for the terminal power amplifier.

Description of drawings

FIG. 1 is a schematic diagram of different OFDM symbols in resource blocks;

FIG. 2 is a flow chart of a downlink power allocation method combined with user characteristics proposed by the present application;

FIG. 3 is a schematic flow diagram of _a specific implementation of the PA readjustment in step 202 in the flow shown in FIG. 2 .

detailed description

For the LTE system, there is no power control in the downlink, and the general downlink power allocation should satisfy two basic conditions as much as possible:

A. The eNB power can be fully utilized;

B. Integrate the channel status of each user in the cell to ensure the optimal overall performance of the system.

According to the above conditions and requirements, the basic inventive idea of this application is: in the LTE network, in order to ensure the fairness of each user, reasonably configure the power parameter PA according to the user status _. For users with poor channel conditions, a slightly larger PA can be configured to ensure the receiving performance of the UE; for users with good channel conditions, a slightly smaller P _A can be configured under the condition that the user performance is not greatly affected. _A , to save power and reduce the hardware processing overhead of the terminal at the same time; if the channel conditions of two or more users doing business at the same time are similar, the processing can be simplified and the same PA can be configured _.

Based on the above technical conception, a downlink power allocation method combined with user characteristics proposed in this application, as shown in Figure 2, includes the following steps:

Step 201: According to the cell-level parameter P _B configured by the high-level layer, using the principle of maximizing base station power efficiency, determine the initial configuration value of the user-level parameter P _A of each user in the cell;

Step 202: By considering the status information of each user, establish _a resource and power adjustment relationship table for power reallocation users, and redistribute the PA value of each user according to the resource and power adjustment relationship table;

Step 203: When the Reference Signal Received Power (RSRP, ReferenceSignalReceivingPower) reported by the users in the system is high, reduce the received power of the users by lowering the PA according to _a certain threshold, and reduce the requirements on the terminal hardware. This step is optional.

The basis for establishing the resource and power adjustment relationship table is to ensure that the power efficiency is 100%, that is, on the basis of 100% utilization of the initial power allocation, the paired users are redistributed, and the up-regulated power value and the down-regulated power value should be equal, so that Power efficiency is still 100% utilized. That is, the element value in the first row corresponds to the P _A value of the user whose power needs to be lowered, the element value of the first column corresponds to the P _A value of the user who needs to increase the power, and the horizontal and vertical cross elements are the ratio of the number of resource blocks of the user to be increased and the number of resource blocks of the user to be decreased ; This ratio constrains the relationship between paired users occupying resources.

In order to make the technical principles, features and technical effects of the technical solution of the present application clearer, the technical solution of the present application will be described in detail below in conjunction with specific embodiments.

For a fixed P _CRS , according to the PA configuration, the physical downlink shared channel (PDSCH) RE power value P _{PDSCH_a} on the non-CRS symbol can be obtained; P _B determines ρ _B /ρ _A , and ρ _A represents the _PDSCHEPRE on the OFDM symbol where the CRS is located The ratio to CRSEPRE power, ρ _B represents the ratio of PDSCHEPRE to CRSEPRE power on the OFDM symbol where the non-CRS is located, so the relationship between ρ _B /ρ _A actually reflects P _{PDSCH_b} /P _{PDSCH_a} =k, that is, P _{PDSCH_b} =k*P _{PDSCH_a} , k represents the value of ρ _B /ρ _A under the current configuration.

According to the agreement document _36.331 of 3GPP, the possible configuration of PA is shown in Table 2 (expressed in three forms: dB value, real value, and simplified fraction representing real value).

P _A (dB) -6 -4.77 -3 -1.77 0 1 2 3 real value 0.2512 0.3334 0.5 0.6653 1 1.2589 1.5849 2 simplify 1/4 1/3 1/2 2/3 1 5/4 8/5 2

Table 2

Table 3 shows the power efficiency η corresponding to the P _A P _B configuration.

table 3

It can be seen from Table 3 that although P _A P _B has multiple configuration forms, for each fixed P _B configuration, there is only one value of P _A that makes the power efficiency of the base station 100%, so step 201 can use The following implementation mode: adjust the transmit power of the base station according to a certain adjustment step, and continuously measure the power efficiency of the base station. When the power efficiency of the base station _{reaches a} maximum value, the corresponding PA is used as the user's initial PA configuration value.

In actual scenarios, the power increase of the transmitting end by NdB generally has less impact on the performance of the receiving end than NdB. Therefore, the current power adjustment generally takes no less than 3dB as the adjustment step size, and the following special circumstances are allowed:

_a . For some special PA, 2dB can also be used as the adjustment step (such as _3dB step exceeds the range of PA, etc.). For 1dB power increase, the system performance improvement is generally less than 1dB, so 1dB step adjustment is not considered for the time being, to avoid power Adjustment frequency is too high, increase system overhead, and system instability.

b. For some special cases, when the RB resources of the first and last users are difficult to meet the conditions in Table 3, an unequal pairing method can be selected, that is, multiple users at the head end are paired with one user at the end end, or one user at the head end is paired with one user at the end end. pairing with multiple users.

c. For the situation that the first user occupies _a large number of RBs, when a reasonable PA cannot be obtained by 3dB, the down-regulation step size is allowed to be less than 3dB, so as to facilitate the release of power.

FIG. 3 shows _a specific implementation process of PA readjustment in step 202, including the following steps:

Step 301: Obtain the currently configured cell-level parameter P _B ;

Step 302: Determine the estimated P _CRS according to the total power of the base station;

Step 303: sort all users in the cell according to the reported RSRP from high to low to obtain a user queue;

Step 304: select users from the first and last ends of the user queue for pairing;

Step 305: Determine whether the RSRP difference between the paired users is smaller than the preset first threshold Thr1, if so, consider that the power difference between users is small and does not need to be adjusted, and end this process; otherwise, execute step 306;

Step 306: According to the proportional relationship between the number of resource blocks allocated to the paired users, query the resource and power adjustment relationship table, and perform power redistribution on the paired users according to the query results; the absolute value of the power reduction of the first user and the power increase of the last user The ratio of absolute values is equal to the result obtained by said query;

Step 307: Judging whether power redistribution has been performed for all users in the cell, if yes, end this process; otherwise, return to step 304.

Taking dual-antenna ports as an example, according to the four possible values of P _B configuration, the four cases of power redistribution are as follows: Case 1: P _B configuration makes ρ _B /ρ _A equal to 5/4.

According to the power efficiency of the base station, first configure the user power according to 100% efficiency and configure the PA as 0dB (if there is enough power), and then the reference signal and the power value on the _PDSCHRE can be obtained according to the total transmission power of the base station.

Assuming that the configuration _PA is the same on the entire bandwidth, then there are

$\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; \&DoubleRightArrow;</span>$

$\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

That is, for each OFDM symbol, there are a total of 1200 REs under 20 MHz bandwidth, wherein there are 200 CRS REs and 800 data REs for OFDM symbols containing CRS; and 1200 data REs for OFDM symbols not containing CRS. The two column symbols have the same maximum total power.

According to the PB configuration, the corresponding relationship of P _{PDSCH_a} /P _CRS can be obtained as follows:

P _{PDSCH_a} /P _CRS =1 (ie P _A =0dB); (2)

Then, P _CRS can be obtained according to the total power of the base station P _BS ; when ρ _A and ρ _B are determined, the transmission power of the data RE can be determined.

It can be seen from the above calculation that the user initially configures PA as _0dB , and then needs to readjust the power of the users in the cell according to the RSRP value reported by the users in the bandwidth.

For M communication users sorted by RSRP from high to low, two users paired at the first and last ends are paired as a user pair (in the first execution, the first and Mth users are paired as a user pair, and in the second execution , the second and M-1th users are paired as user pairs, and so on), obtain the proportional relationship between the number of RBs allocated to the first and last two users (expressed in N), and establish the ratio of the number of user RBs and the ratio of power increase and decrease relationship, and generate the corresponding resource and power adjustment relationship table, and finally read the table to determine the PA value of the two users _.

A specific embodiment of generating a proportional relationship correspondence table is given below:

For pairing users, the RSRP difference should meet a certain threshold Thrl. When it is less than the threshold, it is considered that the power difference between users is small and does not need to be adjusted, so as to avoid excessive system overhead and system instability caused by frequent power adjustments. .

In order to ensure that the adjusted power can still be fully utilized, it is necessary to ensure that the absolute values of the power change values of the first and last two users should be equal. According to the above parameter relationship analysis, let PA _{, first} , PA _{, end} denote the first and last user _PA values after adjustment respectively, and take the initial _PA configuration value as the benchmark PA _.

The absolute value of the power reduction of the first user is:

N _{RB, first} *|P _{A, first} -P _A |*P _CRS (3)

The absolute value of the tail user power increase is:

N _{RB, end} *|P _A -P _{A, end} |*P _CRS (4)

then there is

N _{RB, first} *|P _{A, first} -P _A |*P _CRS = N _{RB, end} *|P _A -P _{A, end} |*P _CRS (5)

$<span\; class="notranslate">\; \&DoubleRightArrow;</span>\frac{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; first</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; |</span>}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; end</span>}}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; \&ap;</span>\frac{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; RB</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; end</span>}}<span\; class="notranslate">\; |</span>}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; RB</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; first</span>}}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\text{<span class="notranslate"> 6</span>}<span\; class="notranslate">\; )</span>$

Wherein, N represents the number of resource blocks allocated by the corresponding user. The first and end footnotes distinguish the first and last users. According to formula (6), the ratio of the number of resource blocks of the last user to the number of resource blocks of the first user is filled in the table shown in Table 4 to obtain the resource and power adjustment relationship table of case 1.

Table 4

Note 1: The first user corresponds to the element value of the first row, the last user corresponds to the element value of the first column, and the horizontal and vertical cross elements are the ratio of the number of RBs of users who are up-regulated to the number of RBs of users who are down-regulated.

Note 2: Items shaded with slashes represent 100% power efficiency;

Note 3: The power of the first user can only be adjusted downwards (because the first user has the highest power among all users), and the power of the last user is generally adjusted upwards, and it can also be adjusted downwards in special cases to avoid excessive UE receiving power.

Note 4: The calculated ratios in the table are determined based on real values, not dB.

To select the _PA configuration, it is necessary to ensure that the adjusted power increase value is equal to or slightly less than the power reduction (that is, the actual adjusted user RB/downgraded user RB should be selected to be less than or equal to the ratio in the table, and then PA corresponding ₎ , to prevent the adjusted Power overflow on a certain OFDM symbol.

If the current configuration of _PA makes the receiving power of the UE too large (this situation often occurs when the users within the user bandwidth are all in the center of the cell), the corresponding configuration of the vertical line shaded item in Table 4 can be used (the power utilization rate is less than 100%), and all users PA is lowered, and the lowering criterion is _{: use N 1 as} the dividing line to adjust the power in two cases respectively, and the adjusted values are different to ensure that the allocated power is relatively balanced; that is, compare the user's PA with the threshold _Thr2 , and if the threshold is lower than the threshold, the user _The PA of the user is lowered by N ₂ dB; if the threshold is greater than the threshold, the user's PA is lowered by N ₁ dB (based on the CRS power being unchanged _{), where N 1 and N 2 are setting} values related to actual scenarios and devices. The Thr2 threshold can be determined according to the linear range of the mainstream terminal working power amplifier.

Case 2: P _B is configured such that ρ _B /ρ _A is 1.

According to the power efficiency of the base station, the initial value of PA is configured as -3dB according to the user power according to 100% efficiency; the reference signal and the power value on the _PDSCHRE can be obtained according to the total transmission power of the base station.

Assuming that the configuration _PA is the same on the entire bandwidth, then there are

$\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; \&DoubleRightArrow;</span>$

$\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; \&DoubleRightArrow;</span>$

$\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

From the above, according to the P _B configuration, the corresponding relationship of P _{PDSCH_a} /P _CRS can be obtained as:

P _{PDSCH_a} /P _CRS =1/2 (P _A =-3dB); (8)

Next, P _CRS can be obtained according to the total base station power P _BS .

Using the same processing method as in case 1, perform power readjustment for users with _a large difference in received power (RSRP) from the beginning to the end, and determine the final PA value.

In order to ensure that the adjusted power can still be fully utilized, it is necessary to ensure that the power increase and decrease values of the first and last users should be equal.

$<span\; class="notranslate">\; \&DoubleRightArrow;</span>\frac{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; first</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; |</span>}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; end</span>}}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; \&ap;</span>\frac{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; RB</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; end</span>}}<span\; class="notranslate">\; |</span>}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; RB</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; first</span>}}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\text{<span class="notranslate"> 6</span>}<span\; class="notranslate">\; )</span>$

The obtained RB resource and power adjustment relationship table is shown in Table 5.

table 5

Note 1: The first user corresponds to the element value of the first row, the last user corresponds to the element value of the first column, and the horizontal and vertical cross elements are the ratio of the number of RBs of users who are up-regulated to the number of RBs of users who are down-regulated.

Note 2: Items shaded with slashes represent 100% power efficiency;

Note 3: The power of the first user can only be adjusted downwards (because the first user has the highest power among all users), and the power of the last user is generally adjusted upwards, and it can also be adjusted downwards in special cases to avoid excessive UE receiving power.

Note 4: The calculated ratios in the table are determined based on real values, not dB.

To select the _PA configuration, it is necessary to ensure that the adjusted power increase value is equal to or slightly less than the power reduction (that is, the actual adjusted user RB/downgraded user RB should be selected to be less than or equal to the ratio in the table, and then PA corresponding ₎ , to prevent the adjusted Power overflow on a certain OFDM symbol.

Case 3: P _B is configured such that ρ _B /ρ _A is 3/4

According to the power efficiency of the base station, first configure the user power according to 100% efficiency to configure PA as _-4.77dB ; according to the total transmission power of the base station, the reference signal and the power value on the PDSCHRE can be obtained.

Assuming that the configuration _PA is the same on the entire bandwidth, then there are

$\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}$

$<span\; class="notranslate">\; \&DoubleRightArrow;</span>\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}$

$<span\; class="notranslate">\; \&DoubleRightArrow;</span>\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}$

$<span\; class="notranslate">\; \&DoubleRightArrow;</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 200</span>}}{\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 9</span>}<span\; class="notranslate">\; )</span>$

From the above, according to the P _B configuration, the corresponding relationship of P _{PDSCH_a} /P _CRS can be obtained as:

P _{PDSCH_a} /P _CRS = 1/3 (P _A =-4.77dB); (10)

Next, P _CRS can be obtained according to the total power P _BS of the base station;

Using the same processing method as in Case 1, perform power readjustment for users with _a large difference in received power (RSRP) from the beginning to the end to determine the final PA value.

In order to ensure that the adjusted power can still be fully utilized, it is necessary to ensure that the power increase and decrease values of the first and last users should be equal.

$<span\; class="notranslate">\; \&DoubleRightArrow;</span>\frac{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; first</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; |</span>}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; end</span>}}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; \&ap;</span>\frac{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; RB</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; end</span>}}<span\; class="notranslate">\; |</span>}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; RB</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; first</span>}}<span\; class="notranslate">\; |</span>}$

The obtained RB resource and power adjustment relationship table is shown in Table 6.

Table 6

Note 1: The first user corresponds to the element value of the first row, the last user corresponds to the element value of the first column, and the horizontal and vertical cross elements are the ratio of the number of RBs of users who are up-regulated to the number of RBs of users who are down-regulated.

Note 2: Items shaded with slashes represent 100% power efficiency;

Note 3: The power of the first user can only be adjusted downwards (because the first user has the highest power among all users), and the power of the last user is generally adjusted upwards, and it can also be adjusted downwards in special cases to avoid excessive UE receiving power.

Note 4: The calculated ratios in the table are determined based on real values, not dB.

To select the _PA configuration, it is necessary to ensure that the adjusted power increase value is equal to or slightly less than the power reduction (that is, the actual adjusted user RB/downgraded user RB should be selected to be less than or equal to the ratio in the table, and then PA corresponding ₎ , to prevent the adjusted Power overflow on a certain OFDM symbol.

Case 4: P _B is configured such that ρ _B /ρ _A is 1/2

According to the power efficiency of the base station, the user power is first configured according to 100% efficiency PA to be -6dB; according to the total transmission power of the base station, the reference signal and the power value on the _PDSCHRE can be obtained.

First, assuming that all users use the same _PA , then there is

$\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; \&DoubleRightArrow;</span>$

$\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 800</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; \&DoubleRightArrow;</span>$

$\mathrm{<span\; class="notranslate">\; 200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; CRS</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 400</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1200</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; PDSCH</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; a</span>}}$

From the above, according to the P _B configuration, the corresponding relationship of P _{PDSCH_a} /P _CRS can be obtained as:

P _{PDSCH_a} /P _CRS =1/4 (P _A =-6dB);

Next, P _CRS can be obtained according to the total power P _BS of the base station;

For this scenario, when the power efficiency is 100%, the configuration for PA is _-6dB , which is the minimum configuration value of PA, that is, the largest _RSRP user cannot lower the power for other users to use it. Therefore, the above-mentioned processing is not performed on this block, that is, power readjustment is generally not performed under this configuration.

The obtained RB resource and power adjustment relationship table is shown in Table 7.

Table 7

Note 1: The first user corresponds to the element value of the first row, the last user corresponds to the element value of the first column, and the horizontal and vertical cross elements are the ratio of the number of RBs of users who are up-regulated to the number of RBs of users who are down-regulated.

Note 2: Items shaded with slashes represent 100% power efficiency;

Note 3: The power of the first user can only be adjusted downwards (because the first user has the highest power among all users), and the power of the last user is generally adjusted upwards, and it can also be adjusted downwards in special cases to avoid excessive UE receiving power.

Note 4: The calculated ratios in the table are determined based on real values, not dB.

To select the _PA configuration, it is necessary to ensure that the adjusted power increase value is equal to or slightly less than the power reduction (that is, the actual adjusted user RB/downgraded user RB should be selected to be less than or equal to the ratio in the table, and then PA corresponding ₎ , to prevent the adjusted Power overflow on a certain OFDM symbol.

Of course, in actual scenarios, if the user status is not good, you can sacrifice resources in exchange for user performance, that is, leave some RB resources of the entire bandwidth, do not allocate, and do not carry data, so that some power can be saved , for service users to adjust power upwards, but at this time the spectrum efficiency is correspondingly reduced.

In the introduction of the above method, the case of 2 ports is taken as an example for illustration, and the cases of other ports are handled similarly; the threshold Thr1 can be assumed to be 3dB at present.

The thresholds and parameters of the technical solution of this application are based on the current simulation conditions and empirical values given by the algorithm. If the algorithm or other conditions change, the relevant thresholds should also be adjusted accordingly.

The technical scheme of the embodiment of the present application has the advantages that:

1) According to the cell-level parameter configuration, user power allocation is divided into four types to be considered separately, and the corresponding initial _PA value under each P _B configuration is given according to 100% power efficiency;

2) For each type, consider different user characteristics, such as channel status, the number of allocated resources, etc., and establish _a relative relationship with power adjustment based on these characteristics, and then determine their respective PA configurations to ensure that the entire bandwidth power is fully utilized;

3) The power allocation based on this scheme ensures that the eNB power is fully utilized and avoids overflow or waste. At the same time, it can also reduce the fluctuation range of the received signal of the user terminal and reduce the requirements for the terminal power amplifier.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the scope of protection of the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the technical solutions of the application are It should be included within the protection scope of this application.

Claims (6)

1. A downlink power allocation method, comprising: A. Determine the initial configuration value of the user-level parameter P _A of each user in the cell according to the cell-level parameter P _B configured by the high-level layer and according to the principle of maximizing base station power efficiency; B. By considering the status information of each user, establish a resource and power adjustment relationship table for users who need to increase power and users who need to lower power; in the resource and power adjustment relationship table, the element values in the first row correspond to users who need to lower power P _A value, the element value in the first column corresponds to the P _A value of the user who needs to increase the power, and the horizontal and vertical cross elements are the ratio of the number of resource blocks for the user who is up-regulated to the number of resource blocks for the user who is down-regulated; C. Redistribute the _PA value of each user according to the resource and power adjustment relationship table, including: C1. Obtain the currently configured cell-level parameter P _B ; C2. Determine the estimated P _CRS according to the total power of the base station; C3, sort all users in the cell according to the reported reference signal received power RSRP from high to low, and obtain a user queue; C4. Selecting the first user and the tail user from the first and last ends of the user queue respectively for pairing; C5. Determine whether the RSRP difference between the paired users is smaller than the preset first threshold, if so, consider that the power difference between the users is small and does not need to be adjusted, and end this process; otherwise, execute step C6; C6. According to the proportional relationship of the number of resource blocks allocated to the paired users, query the resource and power adjustment relationship table, and perform power redistribution to the paired users according to the query results; the absolute value of the power reduction of the first user and the absolute power increase of the tail user The ratio of values is equal to the result obtained by said query; C7. Determine whether power redistribution has been performed for all users in the cell, and if so, end this procedure; otherwise, return to step C4. 2. The method according to claim 1, characterized in that, in step _A , the base station power efficiency maximization principle is used to determine that the initial configuration value of the user-level parameter PA of each user in the cell is: according to a certain adjustment step Adjust the transmit power of the base station and measure the power efficiency of the base station continuously. When the power efficiency of the base station _{reaches a} maximum value, the corresponding PA is used as the user's initial PA configuration value. 3. The method according to claim 2, characterized in that the adjustment step size is 2dB or 3dB. 4. The method according to claim 1, characterized in that, selecting the first user and the last user from the first and last ends of the user queue in step C4 to perform pairing includes: Pairing multiple users at the head end of the user queue with one user at the tail end, or pairing one user at the head end of the user queue with multiple users at the tail end. 5. The method according to claim 1, wherein the first threshold is 3dB. 6. The method according to any one of claims 1 to 5, characterized in that, after step _C , it further comprises: comparing the user's PA with the second threshold, and if it is less than the second threshold, _lowering the user's PA by N ₂ dB; if it is greater than the _{second threshold, lower the user's PA by N 1 dB, where N 1 and N 2 are setting values} related to actual scenarios and equipment.