WO2011116720A2 - Procédé, dispositif et station de base destinés à allouer de la puissance - Google Patents

Procédé, dispositif et station de base destinés à allouer de la puissance Download PDF

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Publication number
WO2011116720A2
WO2011116720A2 PCT/CN2011/073531 CN2011073531W WO2011116720A2 WO 2011116720 A2 WO2011116720 A2 WO 2011116720A2 CN 2011073531 W CN2011073531 W CN 2011073531W WO 2011116720 A2 WO2011116720 A2 WO 2011116720A2
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Prior art keywords
power
ratio
total
maximum
user
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PCT/CN2011/073531
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English (en)
Chinese (zh)
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WO2011116720A3 (fr
Inventor
徐修强
徐志昆
张舜卿
陈雁
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华为技术有限公司
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Priority to PCT/CN2011/073531 priority Critical patent/WO2011116720A2/fr
Priority to CN201180000497.1A priority patent/CN102577531B/zh
Publication of WO2011116720A2 publication Critical patent/WO2011116720A2/fr
Publication of WO2011116720A3 publication Critical patent/WO2011116720A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a power allocation method and apparatus, and a base station. Background technique
  • the reference signal is a known signal for channel estimation provided by the transmitting end to the receiving end. Transmitting a high-power reference signal ensures channel estimation accuracy, ensures cell coverage, and improves signal detection performance. On the other hand, improving the transmission power used to transmit user data information can also improve system performance.
  • the total transmission power used for reference signal transmission and user data transmission is limited, the power occupied by the reference signal (hereinafter referred to as “reference signal power”) and the power occupied by user data (hereinafter referred to as “user data power”)
  • reference signal power the power occupied by the reference signal
  • user data power the power occupied by user data
  • the relationship is the same, that is, if the power used for the reference signal transmission is large, the power used for user data transmission is correspondingly small, and vice versa, if the power used for the reference signal transmission is small, The power of user data transmission will be correspondingly large.
  • how to properly allocate the power for reference signals and user data is a matter of great concern to the industry. question.
  • the prior art proposes a channel threshold-based power allocation method in an OFDM (Frequency Division Multiplexing) system, which is based on channel gain and total system power limit. owned.
  • the specific power allocation expression is as follows:
  • MMSE the minimum mean square error estimate of the data on the first subcarrier.
  • ⁇ the channel threshold, which is obtained by the following system total power limit conditions.
  • the above prior art utilizes small-scale channel information (instantaneous channel information), that is, channel information with fast time-scale changes for power allocation, it is necessary to frequently feed back a large amount of channel information and inform the receiver of power allocation information, which leads to Additional signaling overhead.
  • the above prior art only considers the allocation of power (power for user data transmission) on the subcarriers, and how to perform power allocation when using the reference signal for channel estimation is not involved, and only the mutual information amount is the largest. The power distribution is not considered, and the power distribution scheme is designed from the perspective of optimal energy efficiency.
  • Embodiments of the present invention provide a power allocation method and apparatus, and a base station, which provide optimal energy efficiency for the system.
  • An embodiment of the present invention provides a power allocation method, including: calculating a ratio of a reference signal power to a predetermined value a and a user data power of a user U m to a predetermined value when a total transmission power is a fixed value Example jS m, Um said user is any user in the system in a connected state; and said ratio according to the ratio of /, determines the transmission power of a total system energy efficiency to whether the maximum value, if yes, obtaining Calculating the ratio and ratio, otherwise, updating the total transmission power to calculate the ratio a and the ratio ⁇ ⁇ after updating the total transmission power P t , and determining whether the energy efficiency of the system is maximum after the total transmission power P t is updated, if Then, the ratio "sum ratio" calculated after the total transmission power update is obtained.
  • An embodiment of the present invention provides a power allocation method, including: acquiring a total transmission power P t when the energy efficiency of the system is maximum, a ratio a when the reference signal power accounts for the fixed total power P t is a fixed value, and a user of the user 1 ⁇
  • the ratio of the data power to the total power of the transmission is the fixed value; if the product of the sum, P t a is greater than or equal to the minimum value of the reference signal power, the ratio a and the ratio are used as the power distribution ratio of the reference signal and the power of the user data, the conversion to the final transmission to the power conversion efficiency;??
  • An embodiment of the present invention provides a power distribution apparatus, including: a ratio calculation module, configured to calculate a ratio a of a reference signal power to a predetermined value when a total transmit power is a fixed value, and a user data power of a user U m
  • the ratio of the value ⁇ ⁇ , the user U m is any user in the connected state in the system
  • the judgment processing module is configured to calculate the ratio “and the ratio according to the ratio calculation module, and determine that the total power of the transmission is Whether the energy efficiency of the system is the largest when the value is stated, and if so, the ratio and ratio are obtained, otherwise the total power of the transmission is updated.
  • the ratio calculation module is further configured to calculate the ratio and the ratio ⁇ ⁇ after the total transmission power/ ⁇ update, and the determining processing module is further configured to determine whether the energy efficiency of the system is the largest after the total transmission power P t is updated. If yes, the ratio "sum ratio" calculated after the total transmission power update is obtained.
  • An embodiment of the present invention provides a base station, where the base station includes the foregoing power distribution device.
  • An embodiment of the present invention provides a power distribution apparatus, including: a first acquiring module, configured to acquire a total transmission power P f when the energy efficiency of the system is maximum, and a ratio of a reference signal power to a total value of the total transmission power/ ⁇ a user data power of a and user Um occupies a ratio ⁇ ⁇ when the total transmission power / ⁇ is a fixed value; a second obtaining module, configured to: if the product of the sum, and ? is greater than or equal to a minimum value of the reference signal power, the proportion and the ratio are used as a ratio of the reference signal power to the user data power , the conversion efficiency of the conversion to the final transmission power;
  • a third obtaining module configured to: if the product of the sum and the sum does not satisfy a condition that is greater than or equal to a minimum value of the reference signal power, re-acquire and transmit the condition that the reference signal power is equal to the / ⁇
  • the ratio of the reference signal power to the fixed value a and the user data power of the user Um occupy the ratio ⁇ ⁇ of the fixed value.
  • An embodiment of the present invention provides a base station, where the base station includes the foregoing power distribution device.
  • the embodiment of the present invention considers the power allocation from the ratio of the reference signal power to the ratio of the total transmission power to a certain fixed value and the ratio of the user data power to the fixed value.
  • the technology only considers the different allocation of user data power, taking into account the situation of channel estimation using reference signals.
  • the joint design reference signal power and user data power of the present invention can further reduce system power consumption based on optimizing total power.
  • the method provided by the embodiment of the present invention determines whether the energy efficiency of the system is the largest when the total power is a certain value, and the reference signal power and the user are allocated according to the ratio a and the ratio ⁇ ⁇ obtained when the energy efficiency of the system is maximum.
  • the data power therefore, the invention transmits the total power from the perspective of optimal energy efficiency, and the overall energy consumption of the system air interface is greatly reduced compared with the traditional method of transmitting the maximum transmission power of the system, thereby achieving high efficiency and energy saving.
  • FIG. 1 is a schematic flowchart of a power allocation method according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of an iterative search ratio and scale method according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a power allocation method according to another embodiment of the present invention
  • FIG. 4 is a flowchart of a power allocation method according to another embodiment of the present invention
  • FIG. 5 is a flowchart of a power allocation method according to another embodiment of the present invention
  • FIG. 4 is a flowchart of a power allocation method according to another embodiment of the present invention
  • FIG. 5 is a flowchart of a power allocation method according to another embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a logical structure of a power distribution apparatus according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a logic structure of a power distribution apparatus according to another embodiment of the present invention
  • FIG. 8 is a schematic diagram of a logic structure of a power distribution apparatus according to another embodiment of the present invention
  • FIG. 9 is a schematic diagram of another embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a logical structure of a power distribution apparatus according to another embodiment of the present invention
  • FIG. 11 is a schematic diagram of a logical structure of a base station according to an embodiment of the present invention;
  • FIG. 12 is a schematic diagram of a logical structure of a power distribution apparatus according to another embodiment of the present invention
  • FIG. 13 is a schematic diagram of a logical structure of a power distribution apparatus according to another embodiment of the present invention
  • FIG. 15 is a schematic diagram showing the logical structure of a power distribution device according to another embodiment of the present invention
  • FIG. 16 is a schematic diagram showing the logical structure of a power distribution device according to another embodiment of the present invention
  • FIG. 17 is a schematic diagram of a logical structure of a power distribution apparatus according to another embodiment of the present invention
  • FIG. 18 is a schematic diagram of a logical structure of a power distribution apparatus according to another embodiment of the present invention
  • FIG. 20 is a schematic diagram of a logical structure of a base station according to another embodiment of the present invention.
  • Embodiments of the present invention provide a power allocation method and apparatus, and a base station, which provide optimal energy efficiency for the system.
  • Method in this embodiment Mainly includes the steps:
  • the total power to be transmitted includes two parts, that is, power for transmitting the reference signal (the cartridge is referred to as “reference signal power”) and power for transmitting user data (the cartridge is called “user data power”).
  • Reference signal power the reference signal
  • user data power the cartridge is called “user data power”
  • the fixed value may be the maximum total transmission power of the total transmission power, that is, the total transmission power Power / ⁇ is the maximum total transmit power P.
  • the reference signal power is calculated to account for the maximum total transmission power P.
  • the ratio a and the user data power account for the maximum transmitted total power P.
  • the ratio ⁇ ⁇ then, can gradually reduce the total transmitted power.
  • step S101 Calculate the ratio and the ratio calculated according to step S101, and determine whether the energy efficiency of the system is the maximum when the total transmission power/ ⁇ is the fixed value. If yes, obtain the ratio and ratio. Otherwise, update the total transmission power.
  • determining whether the energy efficiency of the system is maximum when the total value of the total power is transmitted may be: determining, according to the ratio and the ratio, the total power of the transmission P t At the maximum, the system has the highest energy efficiency.
  • the energy efficiency 7 of the system is defined as the amount of information transmitted under unit energy consumption. which is:
  • P f is the total power transmitted by the system
  • ⁇ is the sum of the circuit loss and the static power consumption
  • M is the number of users in the connected state in the system
  • ⁇ / is the subcarrier bandwidth
  • N m is the number of subcarriers occupied by the user m
  • 7 is the conversion efficiency of the total transmit power P t converted to the final transmit power.
  • the ratio of the reference signal power to the total transmit power P t is the ratio of the user data power of the mth user to the total transmit power/ ⁇ , which is the large-scale channel gain of the mth user, and is the noise power of the mth user.
  • L m is the number of resolvable multipaths of the mth user experiencing the channel.
  • the ratio of the reference signal power to the maximum total transmission power CC and the user data power of the user UTM to the maximum total transmission power ⁇ ⁇ are obtained, the ratio (and the ratio ⁇ ⁇ according to the allocated reference signal power and the user data power) .
  • the ratio a and the ratio of the total power P t updated in the step S102 are calculated, and the ratio of the reference signal power to the maximum total transmission power and the user of the user U when calculating the total transmission power ⁇ maximum is calculated.
  • the ratio of the data power to the maximum total transmission power is similar, and the difference is only that the total power used for the calculation of the used parameters is changed.
  • the energy efficiency of the system after the total power is updated may be compared with the energy efficiency of the system before the update, and the total power is updated to determine the energy efficiency when updating. Whether the growth rate reaches the set accuracy, and if so, the total transmission power is judged.
  • the energy efficiency of the system is maximized after the update.
  • the setting accuracy is assumed to be the energy efficiency of the system before the total power is updated; ⁇ , the energy efficiency of the system after the total power update is caravan, if i) ⁇ i is established, then the energy efficiency growth rate of the total power update is determined to be set.
  • the accuracy, otherwise, the total transmission power is updated again and it is judged whether the energy efficiency growth rate at the time when the total transmission power is updated again reaches the set accuracy fl .
  • the power allocation is considered in terms of the ratio of the reference signal power to the maximum transmission total power and the ratio of the user data power to the maximum transmission total power, so that only the user is considered in the prior art.
  • the allocation of data power is different, taking into account the situation of channel estimation using reference signals.
  • the joint design of reference signal power and user data power of the present invention can further reduce system power consumption based on optimizing total power.
  • the method provided by the embodiment of the present invention determines whether the energy efficiency of the system is the largest when the total power is a certain value, and the reference signal power and the user are allocated according to the ratio a and the ratio ⁇ ⁇ obtained when the energy efficiency of the system is maximum.
  • the data power therefore, the invention transmits the total power from the perspective of optimal energy efficiency, and the overall energy consumption of the system air interface is greatly reduced compared with the traditional method of transmitting the maximum transmission power of the system, thereby achieving high efficiency and energy saving.
  • the initial value set by the maximum transmission total power and the ratio, and the ratio of the user data power of the user Um to the maximum total transmission power is obtained ⁇ ⁇ ;
  • the expression is specifically
  • N m is the number of subcarriers occupied by the user UTM
  • P For the maximum transmitted total power, p is the corpse.
  • ⁇ is the large-scale channel gain of the user UTM
  • the noise power of the user Um L m is the number of resolvable multipaths that the user Um experiences the channel
  • V is the Lagrangian multiplier, Satisfied ⁇ ;! ! ⁇ , ⁇ )) ⁇ - , can use the dichotomy to find the optimal V
  • M is the number of connected / 3 ⁇ 4 in the system.
  • determining the ratio of the initial value is set when the ratio of a set initial value satisfies the acquired acquired ⁇ , places ⁇ ⁇ acquired at this time and the initial value of the ratio, respectively, as a set of The ratio of the user data power to the maximum transmission total power and the reference signal power to the maximum transmission total power, otherwise, updating the value of the ratio (S204), where £ 3 is the empirical value, one- 1 (1 to - 5.
  • £ 3 is the empirical value, one- 1 (1 to - 5.
  • the step / / 2 can be the selected fixed value or the optimal step size obtained by some optimization method, such as the dichotomy.
  • optimization problem 1 (ie, energy efficiency function 7) is a quasi-convex function, and constraint 1 is a linear constraint. Therefore, optimization problem 1 is a quasi-convex problem. According to the optimization theory, it is easy to obtain the above problem. There is a unique ratio of the optimal total transmission power, the reference signal power, and the user data power to the optimal total transmission power.
  • the total transmit power takes the maximum value P. Whether the energy efficiency of the system is the largest, if the maximum, the user data power of the user U m respectively obtained by the sum ratio a obtained at this time accounts for the maximum total transmission power P. The ratio and reference signal power account for the maximum transmitted total power P. proportion.
  • the following method when determining whether the energy efficiency of the system is maximum when the total transmission power is maximum, the following method may be implemented:
  • the energy efficiency function 7 is 1 mg ol ⁇ L m+ N m a) where ⁇ / is the subcarrier bandwidth, N m
  • the number of subcarriers is occupied, / ⁇ is the sum of circuit loss and static power consumption, ? is the conversion efficiency of the conversion to final transmission power, ⁇ is the large-scale channel gain of user U, and the noise power of user Um , L m is the number of resolvable multipaths that the user U experiences the channel, and M is the number of users in the system that are connected.
  • ⁇ is the large-scale channel gain of the user U
  • the power allocation algorithm based on the prior art based on small-scale channel information (that is, channel information with fast time-scale changes, for example, instantaneous channel information, etc.)
  • the power distribution method according to the embodiment of the present invention is provided by the present invention, according to the channel large-scale channel information (that is, the channel information that is invariant for a long time, such as path loss, shadow fading, and large-scale channel gain, etc.).
  • the amount of channel information required is small, and the feedback frequency is low. If the partial derivative ⁇ is at the total transmission power / ⁇ is the maximum transmission total power P.
  • the value of time that is, greater than or equal to 0, determines that the system has the highest energy efficiency when the total transmission power is maximum.
  • the foregoing determines the principle of whether the energy efficiency of the system is maximum when the total power/ ⁇ maximum is transmitted.
  • ⁇ ⁇ 0, indicating that the energy efficiency function 7 is an increasing function with respect to the total power of transmission P f , and its physical meaning is dP t
  • the system energy efficiency increases as P f increases, so when it reaches its maximum value P. At this time, the energy efficiency 7 of the system is obviously the largest.
  • FIG. 3 it is a flowchart of a power allocation method according to another embodiment of the present invention. It can be used as a supplementary description of the power allocation method provided in the example of FIG.
  • set the transmit power / ⁇ to the maximum value P. can be the maximum value of the power amplifier.
  • the iterative algorithm exemplified in FIG. 2 can be used to calculate the reference signal power as the maximum total transmission power P according to ⁇ /, N m , ⁇ , ⁇ ⁇ , a m 2 , L m , and the like.
  • the ratio "and user data power accounts for the maximum transmitted total power P. proportion. ⁇ /, N m , ⁇ , ⁇ ⁇ , ⁇ , L m , ⁇ ⁇ have the same meanings as ⁇ /, N , ⁇ , ⁇ , ⁇ , L , in the previous examples, do not like
  • the total transmit power at w iterations, A is the iteration step size, which can be set to a fixed value, or set to the optimal value found by some optimization algorithm (for example, dichotomy).
  • the method is similar to S302, that is, the iterative algorithm illustrated in Fig. 2 can be employed.
  • the difference is that the total transmitted power at this time is the maximum value P. Change to a different value.
  • the setting accuracy is fl (generally set to 10 - 1 ⁇ 10- 5 ), assuming that the total power is transmitted / ⁇ before the update (that is, the total transmitted power at the w - l iterations / ⁇ ) ;; ⁇ , after the total power is sent (ie, the total power transmitted at the wth iteration), the energy efficiency of the system is;; negligence, if n ) ⁇ , the energy efficiency obtained by this iteration is judged; Energy efficiency; 7 mesh-i, the growth rate can reach the set accuracy.
  • the reference signal power and the user data power can be allocated according to the ratio as long as the ratio and the ratio are solved.
  • the following embodiments are the same and will not be described again.
  • the reference signal may have other uses besides being used for channel estimation, for example, to ensure a certain cell coverage. Therefore, the reference signal power takes a value higher than a certain threshold, that is, paP t ⁇ ⁇ ⁇ , where ⁇ is the minimum value of the reference signal power, and the meanings of ⁇ , and are the same as in the previous embodiment. That is to say, when the constraint 7 ⁇ 4 is added, the optimization problem 1 is converted into the following optimization problem 2:
  • the value is the maximum total transmission power of the total transmission power.
  • the total transmission power p f and the reference signal power of the system when the energy efficiency of the system is maximized are The proportion of the ratio a and the user data of the user U m when the total transmission power is the fixed value is: the total transmission power when the energy efficiency of the system is maximized, and the reference signal power accounts for the maximum transmission total.
  • the ratio of the power a and the user data power of the user U m account for the ratio of the maximum transmitted total power.
  • step S402. If the product of Pt and a obtained in step S401 is greater than or equal to a minimum value of the reference signal power, the ratio and the ratio are used as a ratio of the reference signal power and the user data power.
  • ? is converted to the conversion efficiency of the final transmission power. If / ⁇ is established, the total transmit power and power ratio at this time is also the optimal solution for optimization problem 2, and the solution process ends.
  • the total transmit power is reacquired under the condition that the reference signal power is equal to the / ⁇ .
  • the ratio of the reference signal power to the fixed value when the value is fixed "the ratio of the user data power of the user U m to the fixed value ⁇ ⁇ .
  • the ratio of data power to the maximum transmitted total power ⁇ ⁇ including steps
  • the energy efficiency of the system is the largest when the sum of the user data powers ⁇ ⁇ of the plurality of users is the largest.
  • it is determined whether the energy efficiency of the system is the maximum when the total transmission power is maximum, and the steps include:
  • N m is occupied by the user U m
  • the sum of power consumption is the large-scale channel gain of the user u m
  • the noise power of the user 1 L M is the number of resolvable multipaths that the user U m experiences the channel
  • M is the number of users in the system in the connected state.
  • the principle of determining whether the energy efficiency of the system is maximum when the sum of the user data powers of the plurality of users is the maximum ⁇ ⁇ is: ⁇ 0 indicates that the energy efficiency function 7 is an increasing function, and the physical meaning is that the system energy efficiency is The increase is increased, so when the maximum value is taken, the energy efficiency 7 of the system is obviously the largest.
  • determining whether the energy efficiency of the system after maximizing / ⁇ is updated includes: determining whether the energy efficiency growth rate at the time of updating reaches the set accuracy, and if so, determining that the energy efficiency of the system after the update is updated The biggest.
  • the setting accuracy is f 4 , assuming that the energy efficiency of the system before the update is; ⁇ , the energy efficiency of the system after updating is 7;, if ( d) ⁇ 4 , it is judged that the energy efficiency growth rate of the system reaches the set accuracy when updating. Otherwise, it is again / / and judges whether the energy efficiency growth rate at the time of the update is up to the set accuracy.
  • the method of summing the data powers may be: placing the / ⁇ where ⁇ is the updated value of / ⁇ , ⁇ subtitle-i is the ⁇
  • the method further includes:
  • FIG. 5 is a flowchart of a power allocation method according to another embodiment of the present invention
  • Mainly includes the steps:
  • the method and the steps illustrated in Figure 4 S4031 calculates the sum of the user data powers of the plurality of users ⁇ ⁇ is the maximum when the user data power of the user U m is proportional to the ratio y m of ⁇ ⁇ .
  • the difference is that the sum ⁇ ⁇ of the user data powers of a plurality of users at this time is changed from the maximum value ⁇ 0 - ⁇ ⁇ ⁇ to other values.
  • the partial derivative of ⁇ . ⁇ / is the subcarrier bandwidth
  • ⁇ is the large-scale channel gain of the user u m
  • the noise power of the user UTM L m is the number of resolvable multipaths that the user UTM experiences the channel
  • M is the number of users in the system that are connected.
  • the setting accuracy is £ 4 (generally set to 10 - 5 - 10" 10 ), assuming the sum of the user data powers of multiple users / ⁇ before the update (ie the total transmit power at the w -1 iterations) / ⁇ )
  • the energy efficiency of the system is; ⁇ , the sum of the user data powers of multiple users ⁇ after updating (ie, the total power transmitted at the Wth iteration), the energy efficiency of the system is; if ("U ⁇ ⁇ 4 , then judge this The energy efficiency obtained from the next iteration and the last iteration
  • the energy efficiency growth rate reaches the set accuracy.
  • £ 5 - generally may be set to 10-1 (1 ⁇ 10-5.
  • the reference signal power and the user data power can be allocated according to the ratio as long as the ratio and the ratio are solved.
  • the power allocation is considered in terms of the ratio of the reference signal power to the maximum transmission total power and the ratio of the user data power to the maximum transmission total power, so that only the user is considered in the prior art.
  • the allocation of data power is different, taking into account the situation of channel estimation using reference signals.
  • the joint design of reference signal power and user data power of the present invention can further reduce system power consumption based on optimizing total power.
  • the method provided by the embodiment of the present invention determines whether the energy efficiency of the system is the largest when the total power is a certain value, and the reference signal power and the user are allocated according to the ratio a and the ratio ⁇ ⁇ obtained when the energy efficiency of the system is maximum.
  • the present invention designs the system to transmit the total power from the perspective of optimal energy efficiency and guarantees a certain basis on this basis.
  • the cell coverage greatly reduces the overall energy consumption of the system air interface and achieves high efficiency and energy saving.
  • FIG. 6 is a schematic diagram showing the logical structure of a power distribution device according to an embodiment of the present invention.
  • the function module/unit included in the power distribution device of the example of Fig. 6 may be a software module/unit, a hardware module/unit or a combination of hardware and software modules/units, including a proportional calculation module 601 and a judgment processing module 602, where:
  • the ratio calculation module 601 is configured to calculate a ratio of a reference signal power to the fixed value when the total transmission power is a fixed value, and a ratio of a user data power of the user Um to the fixed value, where the user Um is connected in the system. Any user of the status;
  • the determining processing module 602 is configured to calculate, according to the ratio a and the ratio ⁇ ⁇ calculated by the ratio calculating module 601, whether the energy efficiency of the system is maximum when the total transmitting power is the fixed value, and if yes, obtain the ratio a And the ratio p m , otherwise updating the total transmission power P t ;
  • the ratio calculation module 601 is further configured to calculate the ratio and the ratio of the total transmission power/update, and the determining processing module 602 is further configured to determine whether the energy efficiency of the system is the largest after the total transmission power P t is updated. If yes, the ratio "and ratio" calculated after the total transmission power update is obtained.
  • the value is the maximum total transmission power of the total transmission power
  • the ratio calculation module 601 is configured to calculate the maximum total transmission power when the total transmission power is maximum.
  • the proportion a and the user data power of the user U m account for the ratio of the maximum total transmission power ⁇ ⁇
  • the determination processing module 602 is configured to calculate the ratio and the ratio according to the ratio calculation module 601, and determine the judgment in the sending Whether the energy efficiency of the system is the largest when the total power is maximum, and if so, the ratio and ratio are obtained, otherwise the total transmission power is updated.
  • the judgment processing module 602 of the example of FIG. 6 may further include a judging unit 701, as shown in FIG. 7, a power distribution device according to another embodiment of the present invention, wherein:
  • the determining unit 701 is configured to determine whether the energy efficiency growth rate of the total transmission power update is set The accuracy is determined, and if so, it is judged that the energy efficiency of the system is maximized after the total transmission power is updated.
  • the setting accuracy is fl , assuming that the total power is transmitted ⁇ the energy efficiency of the system before updating; ⁇ , the energy efficiency of the system after the total power is updated is; if (H) ⁇ l , the energy efficiency growth rate when the total power is updated is judged
  • the set accuracy is reached. Otherwise, the total transmission power is updated again and it is judged whether the energy efficiency growth rate at the time of the total transmission power/ ⁇ is updated to reach the set accuracy fl .
  • the example ratio calculation module 601 of FIG. 6 or FIG. 7 is specifically configured to calculate, according to the maximum transmission total power, an ratio of a reference signal power to the maximum transmission total power and a user U m when the total transmission power is maximum.
  • User data power occupies a ratio ⁇ ⁇ of the maximum transmission total power, which includes an initial value preset unit 801, a ratio acquisition unit 802, and a ratio determination unit 803, and the power distribution provided by another embodiment of the present invention as shown in FIG.
  • the device is:
  • the initial value preset unit 801 is configured to set an initial value of the ratio
  • the ratio obtaining unit 802 is configured to obtain the ratio of the maximum transmitted total power and the initial value, and the expression is specifically:
  • N m is the number of subcarriers occupied by the user UTM, P. For the maximum transmitted total power, 7 is the P.
  • the ratio determining unit 803 is further configured to use the ratio according to the formula ⁇ ⁇
  • the processing module 602 is further configured to use the total transmit power according to the formula / ⁇ as the updated value of the total transmit power P f , where The / ⁇ is an iteration step.
  • the judgment processing module 602 illustrated in FIGS. 6 to 8 includes a partial derivative calculation unit 901 and a determination unit 902, such as the power distribution apparatus provided in another embodiment of the present invention, wherein:
  • the partial derivative calculation unit 901 is configured to calculate a partial derivative of the energy efficiency function 7 with respect to the total power transmitted, the ⁇ is £ g 2 d+ 2 H ) , ⁇ / is the subcarrier bandwidth, and N m is the user 11 « occupied subcarrier
  • the number of waves, ⁇ is the sum of circuit loss and static power consumption, 7 is the conversion efficiency of the P f converted to the final transmit power, is the large-scale channel gain of the user UTM, and is the noise power of the user UTM, L m
  • M is the number of users in the system in the connected state;
  • the determining unit 902 is configured to determine, if the value of the partial derivative obtained by the partial derivative calculation unit 901 is greater than or equal to 0 when the total transmit power is the maximum transmit power, determine the energy efficiency of the system when the total transmit power is maximum maximum.
  • the power distribution device illustrated in FIGS. 6 to 9 further includes a precision determination module 1001, such as the power distribution device provided by another embodiment of the present invention, as shown in FIG.
  • the accuracy judging module 1001 is configured to determine whether the total energy of the transmission/ ⁇ update (that is, the total transmit power at the w-1th iteration/ ⁇ is updated to the total transmit power at the (0th) iteration)
  • the set accuracy is achieved. For example, by determining whether the establishment, £ 2 - generally can be set to 10- 1 () ⁇ ⁇ - 5. If dr] ⁇ 2 is established, the energy efficiency growth rate reaches the set accuracy.
  • each functional module is only an example, and the actual application may be as needed, for example, the configuration requirements of the corresponding hardware or the real software.
  • the above-mentioned function allocation is completed by different functional modules, that is, the internal structure of the power distribution device is divided into different functional modules to complete all or part of the functions described above.
  • the corresponding functional modules in this embodiment may be implemented by corresponding hardware, or may be executed by corresponding hardware.
  • the foregoing proportional calculation module may have the foregoing calculation and transmission.
  • the ratio of the reference signal power to the maximum total transmission power a and the user data power of the user U m to the ratio of the maximum total transmission power ⁇ ⁇ may also be able to perform corresponding
  • the computer program thus completes the foregoing functions of a general processor or other hardware device; and the foregoing determining processing module may have the function of performing the foregoing determination, whether the energy efficiency of the system is maximum when the total transmission power is maximum, and if so, acquiring the ratio And the ratio, otherwise the hardware that updates the function of transmitting the total power, such as the judgment processor, may also be a general processor or other hardware device capable of executing the corresponding computer program to perform the aforementioned functions.
  • the embodiment of the present invention considers the power allocation from the ratio of the reference signal power to the maximum transmission total power ratio a and the ratio of the user data power to the maximum transmission total power ⁇ ⁇ .
  • the joint design reference signal power and user data power of the present invention can be further reduced on the basis of optimizing the total power. System power consumption.
  • the method provided by the embodiment of the present invention determines whether the energy efficiency of the system is maximum when the total power/ ⁇ is a certain value, and the reference signal power and the user are allocated according to the ratio a and the ratio obtained when the energy efficiency of the system is maximum.
  • the invention designs the system to transmit the total power from the perspective of optimal energy efficiency and guarantees a certain cell coverage on the basis of the core, which greatly reduces the overall system air interface compared with the traditional method of transmitting the maximum transmission power of the system. Energy consumption, achieving energy efficiency.
  • FIG. 11 a schematic diagram of a logical structure of a base station, which can be used in an Orthogonal Frequency Division Multiplexing (OFDM) system, is provided in an embodiment of the present invention.
  • the function module/unit included in the base station provided by the example of FIG. 11 may be a software module/unit, a hardware module/unit or a combination of hardware and software modules/units, including a reference signal power configuration module 1102, a user data power configuration module 1103, and a sub-module.
  • the power distribution device 1101 is configured to calculate a ratio of a reference signal power to the maximum transmission total power and a ratio of user data power of the user U m to the maximum transmission total power when the total transmission power is maximum, according to the ratio and the ratio Determining whether the energy efficiency of the system is the largest when the total transmission power is maximum, and if yes, acquiring the ratio and the ratio, otherwise updating the total transmission power to calculate the ratio and the ratio ⁇ after updating the total transmission power P t , Determining whether the energy efficiency of the system after the total transmission power is updated is the largest, and if yes, obtaining the ratio and proportion calculated after the total transmission power/ ⁇ update;
  • the reference signal power configuration module 1102 is configured to allocate the reference signal power to the coded modulated reference signal according to the ratio of the reference signal power calculated by the power distribution device 1101 to the maximum total transmission power.
  • the user data power configuration module 1103 is configured to configure the user data power to the encoded and modulated user data according to the ratio ⁇ ⁇ of the user data power calculated by the power distribution device 1101 to the maximum total transmission power;
  • a subcarrier mapping module 1104 configured to map the configured reference signal and user data to the subcarriers
  • An inverse Fourier transform module 1105 is configured to perform inverse Fourier transform on the data mapped by the subcarrier mapping module 1104.
  • the cyclic prefix module 1106 is configured to perform the cyclic prefix (CP, Cyclic Prefix) processing on the data transformed by the inverse Fourier transform module 1105.
  • a digital-to-analog conversion module 1107 configured to convert the digital signal output by the cyclic prefix prefix module 1106 into an analog signal
  • the radio frequency module 1108 is configured to: the analog signal output by the digital-to-analog conversion module 1107 is amplified by a power amplifier, and the amplitude of the transmitted analog signal is adjusted according to the total transmission power obtained by the power distribution device 1101, and then transmitted through the radio frequency antenna.
  • the function module/unit included in the power distribution device provided by the example of FIG. 12 may be a software module/unit, a hardware module/unit or a combination of hardware and software modules/units, including a first acquisition module 1202, a second acquisition module 1202 and a The three acquisition module 1203, wherein:
  • the first obtaining module 1201 is configured to acquire a total transmit power P f when the energy efficiency of the system is maximum, a ratio a when the reference signal power accounts for the total transmit power/ ⁇ , and a user data power of the user U m .
  • the second obtaining module 1202 is configured to: when the product of the P f , and ? is greater than or equal to the minimum value of the reference signal power, the ratio and the ratio acquired by the first acquiring module 1201 are used as the reference a ratio of signal power to the user data power, said conversion being the conversion efficiency of the final transmission power;
  • the third obtaining module 1203 is configured to: if the product of the ?, and the sum does not satisfy a condition that is greater than or equal to a minimum value of the reference signal power / ⁇ , then the reference signal power is equal to the ⁇ ⁇ to obtain the total power transmission when the power of the reference signal value representing a ratio of the value of Um and the user account of the user data power ratio value e m.
  • the value is the maximum total transmit power of the total transmit power.
  • the first acquisition module 1201 is configured to acquire the total transmit power reference signal power when the system has the highest energy efficiency.
  • the ratio of the maximum transmission total power a and the user data power of the user U m to the maximum transmission total power, the third obtaining module 1203 is configured to: if the product of the sum and the sum does not satisfy the greater than or equal to the a condition of a minimum value of reference signal power / ⁇ , a ratio of the reference signal power to the fixed value when the fixed signal power is reacquired under the condition that the reference signal power is equal to the / ⁇
  • the ratio of the user data power of the user Um to the fixed value is: if the product of the ?, P f and the sum does not satisfy the condition that is greater than or equal to the minimum value of the reference signal power, then the reference is The signal power is equal to the condition of the ⁇ Obtaining a ratio of the reference signal power to the maximum transmission total power when the
  • the first acquisition module 1201 illustrated in FIG. 12 includes a first ratio calculation sub-module 1301 and a first determination processing sub-module 1302, such as the power distribution apparatus provided by another embodiment of the present invention, as shown in FIG.
  • a first user data power ratio calculation sub-module 1301 for calculating a ratio of the total power transmission and the user account U m maximum total transmit power is the maximum power of the reference signal representing the total maximum transmission power ratio, the user Um is any user in the connected state within the system;
  • the first determination processing sub-module 1302 is configured to calculate, according to the first ratio calculation sub-module 1301, a ratio “and a ratio, determine whether the energy efficiency of the system is maximum when the total transmission power is maximum, and if yes, obtain the ratio and Proportion, otherwise update the total transmit power
  • the first ratio calculating sub-module 1301 is further configured to calculate the ratio and the ratio p m after the sending total power update
  • the first determining processing sub-module 1302 is further configured to determine the total sending power/ ⁇ after updating. Whether the energy efficiency of the system is the largest, and if so, the ratio and proportion calculated after the total power transmission is updated.
  • the first determination processing sub-module 1302 of the example of FIG. 13 includes a first determining unit 1401, such as the power distribution apparatus provided by another embodiment of the present invention, as shown in FIG.
  • the first determining unit 1401 is configured to determine whether the energy efficiency growth rate of the total transmission power update reaches the set accuracy, and if yes, determine that the energy efficiency of the system is maximized after the total transmission power is updated.
  • the third obtaining module 1203 illustrated in FIGS. 12 to 14 includes a third ratio calculating sub-module 1501 and a third judging processing sub-module 1502, as shown in FIG. 15, a power distribution device according to another embodiment of the present invention, wherein :
  • a third user data power ratio calculation sub-module 1501 user data for the maximum sum of the power P p Um user computing a plurality of user accounts for the / ⁇ is the ratio of the maximum / ⁇ . Transmitting the total power for the maximum;
  • the third determination processing sub-module 1502 is configured to determine, according to the calculated ratio y m calculated by the third ratio calculation sub-module 1501, that the energy efficiency of the system is greater when the sum of the user data powers of the plurality of users is maximum No, if yes, the ratio and ratio are obtained according to the method, otherwise the / ⁇ is updated and it is determined whether the energy efficiency of the system after the update is maximum.
  • the third obtaining module 1203 illustrated in FIGS. 12 to 15 further includes an energy efficiency determining sub-module 1601, such as the power distribution device provided by another embodiment of the present invention shown in FIG. 16, wherein:
  • the energy efficiency judging sub-module 1601 is configured to determine whether the energy-efficiency growth rate at the time of the update reaches a set precision, and if yes, determine that the energy efficiency of the system is maximized after the update and update.
  • the third ratio calculation sub-module 1501 illustrated in FIG. 15 or FIG. 16 further includes a variable replacement unit.
  • the ratio calculation unit 1702 is configured to calculate, according to the ratio of the user data power of the user 1 ⁇ obtained by the maximum energy efficiency of the system to the maximum total transmission power,
  • the third determination processing sub-module 1502 illustrated in Fig. 15 or Fig. 16 further includes a partial derivative calculation unit 1801 and a determination unit 1802, as shown in Fig. 18, which is a power distribution device according to another embodiment of the present invention, wherein:
  • the partial derivative calculation unit 1801 is configured to calculate a partial derivative of the energy efficiency function 7 with respect to the ⁇ , where 7 is V AfN m log 2 (1 + ⁇ ⁇ ⁇ _ )
  • ⁇ is the sum of the circuit loss and the static power consumption
  • ⁇ is the large-scale channel gain of the user u m
  • ⁇ is the noise power of the user 1
  • L m is the number of resolvable multipaths experienced by the user U m through the channel
  • M is the number of connected users in the system
  • the determining unit 1802 is configured to determine, when the partial derivative is the maximum sum of the user data powers of the plurality of users, or the value after the / ⁇ update is greater than or equal to 0, determine the number of users in the multiple users
  • the system has the highest energy efficiency according to the sum of the powers ⁇ ⁇ max.
  • the power distribution device of any of the examples of Figures 15 to 18 further includes a precision determination module 1901, such as the power distribution device of another embodiment of the present invention shown in Figure 18, wherein:
  • the accuracy judging module 1901 is configured to determine whether the sum of the user data powers of the plurality of users is updated, and whether the energy growth rate reaches the set accuracy.
  • the power distribution device according to the embodiment of the present invention as shown in the above-mentioned FIG. 12 to FIG. 19, can be considered that the ratio of the reference signal power to the maximum total transmission power and the ratio of the user data power to the maximum transmission total power are considered in the embodiment of the present invention. Power allocation, in this way, different from the prior art, only considering the allocation of user data power, taking into account the case of using the reference signal for channel estimation, the joint design reference signal power and user data power of the present invention can optimize the total power. Further reduce system power consumption. On the other hand, the method provided by the embodiment of the present invention is to determine the total power transmitted.
  • the energy efficiency of the system is the largest, and the reference signal power and the user data power are allocated according to the ratio a and the ratio obtained when the energy efficiency of the system is maximum. Therefore, the present invention designs the system to transmit the total power from the perspective of optimal energy efficiency. And ensuring a certain cell coverage on the basis of this foundation, compared with the traditional method of transmitting the maximum transmission power of the system, the overall energy consumption of the system air interface is greatly reduced, and energy saving is realized.
  • the function module/unit included in the base station provided by the example of FIG. 20 may be a software module/unit, a hardware module/unit or a combination of hardware and software modules/units, including a reference signal power configuration module 2002, a user data power configuration module 2003, a sub- A power distribution device 2001 of any one of the carrier mapping module 2004, the inverse Fourier transform module 2005, the cyclic prefix module 2006, the digital to analog conversion module 2007, the radio frequency module 2008, and the accompanying drawings 12 to 19, wherein:
  • the power distribution device 2001 is configured to calculate a ratio of the reference signal power to the maximum transmission total power a when the total transmission power P t is maximum, and a ratio of user data power of the user U m to the maximum transmission total power, according to the ratio And the ratio, determining the energy of the system when the total transmission power is maximum Whether the effect is the largest, if yes, the ratio and the ratio are obtained, otherwise the total transmission power is updated to calculate the ratio and the ratio ⁇ after the total transmission power P t is updated, and it is determined whether the energy efficiency of the system after the total transmission power is updated Maximum, if yes, obtain the ratio and proportion calculated after the total transmission power / ⁇ update;
  • the reference signal power configuration module 2002 is configured to allocate the reference signal power to the coded modulated reference signal according to the ratio of the reference signal power calculated by the power distribution device 2001 to the maximum total transmission power.
  • the user data power configuration module 2003 is configured to configure the user data power to the encoded and modulated user data according to the ratio ⁇ ⁇ of the user data power calculated by the power distribution device 2001 to the maximum total transmission power;
  • a subcarrier mapping module 2004, configured to map the configured reference signal and user data to the subcarriers
  • An inverse Fourier transform module 2005 configured to perform inverse Fourier transform on the data mapped by the subcarrier mapping module 2004;
  • a cyclic prefix module 2006 configured to perform a cyclic prefix (CP, Cyclic Prefix) process on the data transformed by the inverse Fourier transform module 2005;
  • a digital-to-analog conversion module 2007, configured to convert the digital signal output by the cyclic prefix module 2006 into an analog signal
  • the RF module 2008 is configured to: the analog signal output by the digital-to-analog conversion module 2007 is amplified by a power amplifier, and the amplitude of the transmitted analog signal is adjusted according to the total transmission power obtained by the power distribution device 2001, and then transmitted through the RF antenna.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Read only memory (ROM, Read Only Memory), Random Access Memory (RAM), disk or optical disk.
  • ROM Read only memory
  • RAM Random Access Memory

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  • Supply And Distribution Of Alternating Current (AREA)

Abstract

La présente invention concerne, dans des modes de réalisation, un procédé, un dispositif et une station de base destinés à allouer de la puissance, qui peuvent offrir une efficacité énergétique optimale pour un système. Le procédé comprend : lorsqu'une puissance de transmission totale Pt est une valeur fixe, le calcul d'une proportion α de la puissance du signal de référence par rapport à la valeur fixe et une proportion βm de la puissance des données utilisateur d'un utilisateur Um par rapport à la valeur fixe, l'utilisateur Um étant n'importe quel utilisateur dans un état de connexion dans le système ; selon la proportion α et la proportion βm, le jugement de savoir si l'efficacité énergétique du système est maximale quand la puissance de transmission totale Pt est la valeur fixe ; dans l'affirmative, l'obtention de la proportion α et de la proportion βm, sinon, la mise à jour de la puissance de transmission totale Pt ;le calcul de la proportion α et de la proportion βm à l'issue de la mise à jour de la puissance de transmission totale Pt et le jugement de savoir si l'efficacité énergétique du système est maximale après la mise à jour de la puissance de transmission totale Pt ; dans l'affirmative, l'obtention de la proportion calculée α et de la proportion calculée βm après la mise à jour de la puissance de transmission totale Pt. Le procédé prévu dans la présente invention peut en outre réduire la consommation énergétique du système sur la base d'une optimisation de la puissance totale, réduire fortement la consommation d'énergie totale de l'interface hertzienne du système et réaliser une gestion énergétique efficace.
PCT/CN2011/073531 2011-04-29 2011-04-29 Procédé, dispositif et station de base destinés à allouer de la puissance WO2011116720A2 (fr)

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