WO2017020651A1 - 分配上行功率的方法、设备和系统 - Google Patents

分配上行功率的方法、设备和系统 Download PDF

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Publication number
WO2017020651A1
WO2017020651A1 PCT/CN2016/085289 CN2016085289W WO2017020651A1 WO 2017020651 A1 WO2017020651 A1 WO 2017020651A1 CN 2016085289 W CN2016085289 W CN 2016085289W WO 2017020651 A1 WO2017020651 A1 WO 2017020651A1
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Prior art keywords
user
power control
pdma
uplink
pattern matrix
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English (en)
French (fr)
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康绍莉
孙晓东
刘昊
任斌
高秋彬
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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Priority to EP16832139.6A priority Critical patent/EP3324685B1/en
Priority to US15/749,772 priority patent/US10820277B2/en
Publication of WO2017020651A1 publication Critical patent/WO2017020651A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/225—Calculation of statistics, e.g. average or variance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H04W52/283—Power depending on the position of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Definitions

  • the present disclosure relates to techniques for wireless communications, and more particularly to a method, apparatus, and system for allocating uplink power.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • CDMA code division multiple access
  • the uplink control of the Long Term Evolution (LTE) system adopts power control technology. To ensure good forward compatibility of the system, it is expected that the uplink power control technology will continue to determine the uplink transmit power of the terminal in the future 5G uplink. Since PDMA is superimposed and transmitted in the coding domain and the power domain, it also affects the uplink transmit power of the terminal.
  • LTE Long Term Evolution
  • the LTE uplink power control in the related art adopts open-loop estimation combined with closed-loop adjustment, and the open-loop estimation determines the initial value of the uplink transmit power for the terminal according to the configured parameters such as expected received power, uplink resource allocation, transmission format, and path loss, and then is determined by the base station.
  • the power control commands are sent for real-time closed-loop adjustment.
  • Part of the path loss compensation is introduced in the open loop to determine the uplink transmit power to reduce the interference of the cell edge user's uplink transmit power to the neighboring cell.
  • P PUSCH (i) represents the uplink transmit power of the terminal on subframe i
  • M PUSCH (i) represents the assignment of PUSCH on subframe i
  • the resource size expressed in terms of the number of resource blocks
  • P 0_PUSCH (j) represents the initial value of the PUSCH power
  • j is related to the scheduling grant of the PUSCH transmission/retransmission
  • ⁇ (j) represents the path loss compensation factor
  • PL represents the path loss
  • the system may interfere with the noise ratio (IoT, Interference). Over Thermal), which affects terminal power consumption, number of cell access users, cell average, and edge user spectrum efficiency.
  • IoT noise ratio
  • Over Thermal Over Thermal
  • the related art has the following problems: the uplink power of the LTE system in the related art controls the transmission power of each terminal on each resource block (PRB), and if the PDMA technology is used in conjunction with the uplink power control technology, the related technology is still adopted.
  • the uplink power control mode not only makes the uplink detection complexity higher, but also may cause the uplink transmit power of the terminal to be too large or even exceed the maximum uplink transmit power of the terminal, thereby causing a large uplink IoT rise, resulting in a decrease in the number of access users. Cell and edge users have reduced spectral efficiency.
  • the disclosure provides a method, device and system for allocating uplink power to solve the related art.
  • the PDMA codebook adopts different power control modes, which will cause different system IoT to rise. Further, it will affect the technical problems of system performance when PDMA technology is applied.
  • an embodiment of the present disclosure provides, in an aspect, a method for implementing uplink power control, which is applied to a base station, where the base station forms at least one cell, and the method includes: determining, according to a location of a user in a cell, a method. a paired user; determining a PDMA pattern matrix, assigning each user a different PDMA pattern vector group, forming a power control pattern matrix according to the PDMA pattern vector group; determining a function of each user in a pair according to the power control pattern matrix A rate control factor determines an uplink transmit power of each user according to the power control factor.
  • determining a PDMA pattern matrix, assigning each user a different PDMA pattern vector group, and forming a power control pattern matrix according to the PDMA pattern vector group includes: selecting a PDMA uplink according to the total number of users of the cell and the total resources of the system.
  • PDMA pattern matrix H PDMA (M*N)
  • M is the number of rows of the PDMA pattern matrix
  • N is the number of columns of the PDMA pattern matrix
  • K represents the number of uplink pairing users
  • N 1 , N 2 , ..., N K respectively represent the number of columns of the user 1 , 2, ..., K occupying the PDMA pattern matrix
  • N N 1 + N 2 + ... + N K
  • a 1 , A 2 , ..., A K represent the power control pattern vector group of the users 1, 2 , ..., K , respectively
  • ⁇ represents the dot multiplication of the matrix.
  • determining, according to the power control pattern matrix, a power control factor for each user in a pair includes: selecting an uplink power control optimization mode; for each user current PDMA pattern vector group and a power control factor combination, according to a ratio The principle of fairness (PF, Proportional Fair) weighting and throughput is And satisfying
  • 1 1 to adjust, so that the PF weighting and throughput of the unit power consumption is maximized after multi-user pairing, wherein T k (SINR k, A ) represents that user k is in the power control pattern matrix A.
  • the transmission rate is calculated by the signal-to-interference plus noise ratio (SINR) of the user k and the number of transmission bits obtained by the resource mapping.
  • SINR signal-to-interference plus noise ratio
  • the SINR value of the user k is related to the power control factor in the PDMA pattern matrix.
  • BLER k (SINR k, A ) represents the estimated block error rate (BLER) of the user k when the power control pattern matrix is A, and is obtained by the SINR and BLER mapping relationship.
  • 1 ) represents the total uplink transmit power when user k's power control pattern matrix is A
  • 1 represents the summation of all matrix elements; the historical average rate calculation formula is among them,
  • R k (t) represents the current rate of user k, and ⁇ represents the forgetting factor. When the value is 1, it indicates that the PF weighting and throughput are only related to the current rate of the user.
  • the system factor includes: selecting an uplink power control simplified mode; and determining a power control pattern matrix according to a ratio of an uplink transmit power of the user to an uplink transmit power of an Orthogonal Frequency Division Multiple Access (OFDMA) user
  • a simplified mode or a second simplified mode the first simplified mode, where the uplink transmit power of the user is equal to the uplink transmit power of the OFDMA user, and the minimum unit occupied by the user is a PDMA pattern vector group, and a PDMA pattern vector group allows The minimum unit occupied by the OFDMA user is a PRB.
  • the uplink transmit power of the user is a multiple of the number of PDMA pattern vector groups of the uplink transmit power of the OFDMA user, and the power control pattern matrix should be the PDMA user.
  • the transmission power of the smallest unit occupying the resource is equal to the multiple of the number of PDMA pattern vector group lines of the transmission power of the minimum unit occupied by the OFDMA user.
  • determining the user that needs to be paired further includes: determining, by using an uplink power control manner, an uplink transmit power of each user on the unit PRB.
  • An embodiment of the present disclosure provides, in another aspect, an apparatus for implementing uplink power control, including: a pairing unit, configured to determine, according to a location of a user in a cell, a user that needs to be paired; a power control pattern matrix unit, configured to determine a PDMA pattern matrix, each user is assigned a different PDMA pattern vector group, and a power control pattern matrix is formed according to the PDMA pattern vector group; an uplink transmission power unit is used to determine a power control factor of each user, and each user is determined. Uplink transmit power.
  • the power control pattern matrix unit includes: a PDMA pattern matrix module, configured to determine, according to the total number of users of the cell and the total resources of the system, that the PDMA pattern matrix is H PDMA (M*N), and M represents a row of the PDMA pattern matrix.
  • a PDMA pattern matrix module configured to determine, according to the total number of users of the cell and the total resources of the system, that the PDMA pattern matrix is H PDMA (M*N), and M represents a row of the PDMA pattern matrix.
  • N represents the number of columns of the PDMA pattern matrix
  • the power control pattern matrix selection module is used to adopt the PDMA pattern matrix and the power control factor matrix
  • the uplink transmit power unit includes: an uplink mode selection module, configured to select an uplink power control optimization mode; and an optimized power control pattern matrix calculation module, configured to use a current PDMA pattern vector group and power for each user.
  • Control factor combination based on PF weight per unit power consumption and maximum throughput And satisfying
  • 1 1 for adjustment, T k (SINR k, A ) represents the transmission rate of the user k when the power control pattern matrix is A, and the number of transmission bits obtained by the SINR of the user k and the occupied resource mapping Calculated, the SINR value of user k is related to the power control factor in the PDMA pattern matrix, and BLER k (SINR k, A ) represents the block error rate estimated by user k when the power control pattern matrix is A, by SINR and BLER.
  • the mapping relationship is obtained, Representing the historical average rate of user k at time t, P t (
  • the historical average rate obtained from the statistics of the current time of user k Indicates the historical average rate obtained by the user k at a previous moment.
  • R k (t) represents the current rate of user k, and ⁇ represents the forgetting factor. When the value is 1, it indicates that the PF factor is only related to the current rate of the user.
  • the uplink mode selection module is further configured to select an uplink power control simplified mode
  • the uplink transmit power unit further includes: an uplink transmit power control mode selection module, configured to use, according to the uplink transmit power of the user, The ratio of the uplink transmit power of the OFDMA user is different, and one of the first simplified mode or the second simplified mode of determining the power control pattern matrix is adopted.
  • the uplink transmit power of the user is equal to the uplink transmit power of the OFDMA user, and the user resource is occupied.
  • the minimum unit is a PDMA pattern vector group, one PDMA pattern vector group may occupy multiple PRBs, and the minimum unit occupied by OFDMA resources is one PRB; in the second simplified mode, the user uplink transmission power is a PDMA pattern of OFDMA user uplink transmission power
  • the power control pattern matrix should be such that the minimum unit of the PDMA user occupies resources is equal to the multiple of the number of PDMA pattern vector group lines of the transmission power of the minimum unit occupied by the OFDMA user.
  • the device further includes: an uplink transmit power unit, configured to determine, by using an uplink power control manner, an uplink transmit power of each user on a unit PRB.
  • an uplink transmit power unit configured to determine, by using an uplink power control manner, an uplink transmit power of each user on a unit PRB.
  • An embodiment of the present disclosure provides, in another aspect, a system for allocating uplink power, including: a base station, a receiving end; the base station includes a device for allocating uplink power, where the device includes: a pairing list a unit for determining a user to be paired according to different types of users in a cell; a power control pattern matrix unit for determining a PDMA pattern matrix, each user is assigned a different PDMA pattern vector group, according to the PDMA The pattern vector group forms a power control pattern matrix; an uplink transmit power unit is used to determine a power control factor of each user to determine an uplink transmit power of each user; and a receive end is used to perform a serial interference cancellation method, first demodulating The correct user deletes and then detects other users.
  • 1 is a schematic flow chart of a method for implementing uplink power control
  • FIG. 2 is a flowchart showing an implementation of uplink power control when a PDMA technology is used in combination with an uplink power control technique
  • 3 is a schematic diagram showing that the uplink transmit power of the user is equal to the uplink transmit power of the OFDMA user;
  • FIG. 4 is a schematic diagram showing a multiple of the number of PDMA pattern vector group rows in which the uplink transmit power of the user is the uplink transmit power of the OFDMA user.
  • PDMA utilizes the asymmetry of multi-user channels to design a multi-user unequal diversity sparse coding matrix and coded modulation joint optimization mode in the time domain, frequency domain and code domain.
  • multiple users are distinguished by the columns of the coding matrix on the same time-frequency resource; for power domain superposition transmission, multiple users distinguish by different transmission powers on the same time-frequency resource; Multiple users use different data streams to distinguish between different time-frequency resources.
  • the PDMA technology enables multiple users to transmit on the same time domain, frequency domain and airspace resources.
  • the PDMA technology when used in conjunction with the uplink power control technology, since multiple users transmit on the same time-frequency resource, the user and the power are different to distinguish the user. Therefore, the system IoT may be lifted, thereby affecting the terminal function. Consumption, number of cell access users, cell average, and edge user spectrum efficiency.
  • the embodiment of the present disclosure provides a method for implementing uplink power control. As shown in FIG. 1 , the method includes:
  • Step 101 Determine, according to the location of the user in the cell, a user that needs to be paired;
  • Step 102 Determine a PDMA pattern matrix, assign a different PDMA pattern vector group to each user, form a power control pattern matrix according to the PDMA pattern vector group, and determine an uplink transmission power of each user according to the power control pattern matrix;
  • the allocated PDMA pattern vector group refers to each user occupying a column or column of PDMA pattern matrix, where the allocation can be randomly assigned, as long as the unit power consumption PF weighting and throughput can be found to be maximum;
  • Step 103 Traverse the different PDMA pattern vector groups and power control factor combinations of all users, find a combination that minimizes the PF weight and throughput of the unit PRB power consumption, and determines the uplink transmit power of each user at this time.
  • the technology provided by the application provides a technique for determining the uplink transmit power of the terminal in the joint use process of the uplink power control technology of the PDMA and the LTE system, reduces the power consumption of the terminal, and improves the spectrum efficiency of the uplink cell average and the edge user. Increase the number of cell access users. Differentiating between the coding domain and the power domain to distinguish users, that is, assigning different PDMA codebook patterns and functions to different users The rate, in turn, achieves the purpose of improving the average spectral efficiency of the cell, the spectrum efficiency of the edge users, and the number of access users.
  • the method further includes: determining, by using an uplink power control manner in the related art, an uplink transmit power of each user on a unit PRB.
  • traversing the different PDMA pattern vector groups and power control factor combinations of all users, finding a combination that maximizes the PF weighting and throughput of the unit PRB power consumption includes:
  • the key to the combination of PDMA technology and uplink power control technology is to select the power control pattern matrix and determine the uplink transmit power of the user. According to the difference of the complexity of selecting the power control pattern matrix and determining the uplink transmit power of the user, different embodiments are given optimization. And simplify both implementations.
  • a power control pattern matrix is formed according to a PDMA pattern vector group, and each power control pattern matrix is determined according to the power control pattern matrix.
  • the uplink transmit power of the users includes: traversing all paired users, assigning each user a different PDMA pattern vector group and uplink transmit power, and all possible power control pattern matrices, so that the power consumption after multi-user pairing is the lowest, and The PF weight and throughput per unit of power consumption is the largest.
  • determining a PDMA pattern matrix, assigning each user a different set of PDMA pattern vectors, and forming a power control pattern matrix from the PDMA pattern vector group includes:
  • the PDMA pattern matrix H PDMA (M*N) of the PDMA uplink is selected, M is the number of rows of the PDMA pattern matrix, and N is the number of columns of the PDMA pattern matrix;
  • the power control factor for each user is the sum of the elements of the row and column of the PDMA pattern matrix.
  • the primary goal of the PDMA technology in conjunction with the uplink power control technique is to find different combinations of power control factors such that the PF weighting and throughput per unit power consumption is maximized after multi-user pairing.
  • the unit power is determined. The criteria for consuming PF weighting and throughput are:
  • T k (SINR k, A ) represents the transmission rate of the user k when the power control pattern matrix is A, calculated from the SINR of the user k and the number of transmission bits obtained by the occupied resource mapping, and the SINR value of the user k is The power control factor is related in the PDMA pattern matrix.
  • BLER k (SINR k, A ) represents the block error rate estimated by the user k when the power control pattern matrix is A, which is obtained by the SINR and BLER mapping relationship.
  • 1 ) represents the total uplink transmit power when user k power control pattern matrix is A k
  • 1 represents the summation of the matrix elements.
  • the historical average rate calculation formula is:
  • the historical average rate obtained from the statistics of the current time of user k Indicates the historical average rate obtained by the user k at a previous moment.
  • R k (t) represents the current rate of user k
  • ⁇ represents the forgetting factor. When the value is 1, it indicates that the PF factor is only related to the current rate of the user.
  • the process of controlling the uplink power by using the PDMA technology in combination with the uplink power control technology is as shown in FIG. 2, including:
  • Step 201 Determine a user that needs to be paired according to the location of the user in the cell.
  • Step 202 Determine an uplink transmit power of each user on a unit PRB by using an uplink power control manner in the related art.
  • the uplink power control mode of the related art may be used to determine the uplink transmit power of each user on the unit PRB.
  • Step 203 Determine a PDMA pattern matrix according to the total number of users of the cell and the total resources of the system.
  • Step 204 assign a different PDMA pattern vector group to each user, and form a power control pattern matrix according to the PDMA pattern vector group.
  • the uplink transmission power of each user may also be determined according to the power control pattern matrix.
  • Step 205 calculating PF weighting and throughput of unit power consumption after multi-user pairing.
  • Step 206 Determine whether the PF weighting and throughput of the unit power consumption are the largest. If the PF weighting and throughput of the unit power consumption is not the largest compared with the previous result, return to step 4, and assign a PDMA pattern different from the previous one for the user. Vector group or power control factor; if it is maximum, go to step 207.
  • Step 207 Determine and output an uplink transmit power of each user at this time.
  • Steps 204 to 206 indicate that it is necessary to traverse the different PDMA pattern vector groups and power control factor combinations of all paired users to find a combination that minimizes the PF weight and throughput of the unit power consumption.
  • the optimization mode when searching for the optimal power control pattern matrix, first select the paired users, then assign different power control factor matrices to the paired users, and combine the PDMA pattern matrix to obtain the power control pattern matrix to further determine whether the power control pattern matrix is The unit power consumption PF weighting and throughput are maximized until a power control pattern matrix with unit power consumption PF weighting and maximum throughput is found.
  • a simplified mode can be used in the process of controlling the uplink power.
  • the basic idea of the simplified mode is to ensure that the sum of the column elements of the power control pattern matrix of each user is equal.
  • Determining a PDMA pattern matrix, assigning each user a different PDMA pattern vector group, and forming a power control pattern matrix according to the PDMA pattern vector group further includes: in the simplified mode, according to the uplink transmit power of the user and the uplink transmit power of the OFDMA user The ratio is different, and one of the first simplified mode or the second simplified mode of determining the power control pattern matrix is employed.
  • the first simplified mode is employed, and the uplink transmit power of the user is
  • the uplink transmit power of the OFDMA users is equal; the minimum unit occupied by the user resources is a PDMA pattern vector group, one PDMA pattern vector group may occupy multiple PRBs, and the minimum unit occupied by the OFDMA user resources is one PRB.
  • the minimum unit occupied by users is 3PRB.
  • the minimum unit occupied by user resources in a PDMA system is the number of rows of the PDMA pattern matrix.
  • the minimum unit occupied by an OFDMA user is 1 PRB.
  • the power control pattern matrix of the first simplified mode should be such that the total uplink transmit power of the PDMA pattern vector group occupying the PRB is equal to the uplink transmit power of the OFDMA user single PRB.
  • the second simplified mode is employed, the uplink transmit power of the user being a multiple of the number of PDMA pattern vector group lines of the uplink transmit power of the OFDMA user.
  • the power control pattern matrix of the second simplified mode should make the PDMA pattern vector group occupy the PDMA pattern of the total uplink transmit power of the PRB equal to the uplink transmit power of the OFDMA user single PRB.
  • the average IoT rise in the PDMA system is a multiple of the ratio of the number of PDMA paired users to the number of codebook rows; for the second simplified mode In other words, the average IoT rise within the PDMA system is a multiple of the number of PDMA paired users.
  • the IoT rise is different in the two modes, the difference between the SINRs of the two modes is small.
  • the first simplified mode is lower than the second simplified mode, and the power consumption of the terminal is lower, but the resource usage is lower, due to the second simplified mode.
  • the uplink transmit power is large, which can effectively improve the spectrum efficiency of the cell and edge users.
  • the key to the combination of PDMA technology and uplink power control technology is to select the power control pattern matrix and determine the uplink transmit power of the user. If the simplified mode is used, the PDMA pattern matrix [3, 7] is taken as an example, the PDMA code. This is
  • the total uplink transmit power of the OFDMA system is 3. It is assumed that there are 7 PDMA users, and when the power control pattern matrix is selected by using the first simplified mode and the second simplified mode, the power control factors of each user at each time-frequency resource location are different:
  • each PDMA user has an uplink transmit power of 1, equal to the uplink transmit power of each OFDMA user, and the total uplink transmit power of the PDMA system is 7.
  • the average IoT of the PDMA system is 7/3 times that of the OFDMA system.
  • the second simplified mode there are several PDMA users, namely, User 1, User 2, User 3, User 4, User 5, User 6, and User 7, each of which has an uplink transmit power of 3 Is three times the uplink transmit power of each OFDMA user, and the total uplink transmit power of the PDMA system is 21.
  • the average IoT of the PDMA system is seven times that of the OFDMA system.
  • the IoT rise is different for the two simplified modes at full load, but the SINR calculations for the two simplified modes are the same, 7/3 if noise is not considered.
  • the system resource occupancy rate is low, since the uplink transmission power of the user in the second simplified mode is high, a large system performance rise can be obtained, but the terminal power consumption is also increased.
  • An embodiment of the present disclosure provides an apparatus for implementing uplink power control, including:
  • a pairing unit configured to determine a user that needs to be paired according to a location of the user in the cell
  • a power control pattern matrix unit configured to determine a PDMA pattern matrix, assign a different PDMA pattern vector group to each user, and form a power control pattern matrix according to the PDMA pattern vector group;
  • the uplink transmit power unit is configured to determine a power control factor of each user, and determine an uplink transmit power of each user.
  • the power control pattern matrix unit includes:
  • the PDMA pattern matrix module is configured to determine, according to the total number of users of the cell and the total resources of the system, that the PDMA pattern matrix is H PDMA (M*N), M represents the number of rows of the PDMA pattern matrix, and N represents the number of columns of the PDMA pattern matrix;
  • the uplink transmit power unit comprises:
  • An uplink mode selection module for selecting an uplink power control optimization mode
  • Optimized power control pattern matrix calculation module for the current PDMA pattern vector group and power control factor combination for each user, based on the unit power consumption PF weighting and maximum throughput criteria And satisfying
  • 1 1 for adjustment, T k (SINR k, A ) represents the transmission rate of the user k when the power control pattern matrix is A, and the number of transmission bits obtained by the SINR of the user k and the occupied resource mapping Calculated, the SINR value of user k is related to the power control factor in the PDMA pattern matrix, and BLER k (SINR k, A ) represents the block error rate estimated by user k when the power control pattern matrix is A, by SINR and BLER.
  • the mapping relationship is obtained, Representing the historical average rate of user k at time t, P t (
  • the historical average rate calculation formula is among them,
  • the historical average rate obtained from the statistics of the current time of user k, Indicates the historical average rate obtained by the user k at a previous moment.
  • R k (t) represents the current rate of user k
  • ⁇ represents the forgetting factor. When the value is 1, it indicates that the PF factor is only related to the current rate of the user.
  • the uplink transmit power unit further includes:
  • the uplink mode selection module is further configured to select an uplink power control simplified mode
  • the uplink transmit power control mode selection module is configured to determine one of a first simplified mode or a second simplified mode of determining a power control pattern matrix according to a ratio of an uplink transmit power of the user to an uplink transmit power of the OFDMA user:
  • the uplink transmit power of the user is equal to the uplink transmit power of the OFDMA user, and the minimum unit occupied by the user resource is a PDMA pattern vector group, and one PDMA pattern vector group may occupy multiple PRBs, and the minimum unit occupied by the OFDMA resource is one. PRB;
  • the uplink transmit power of the user is a multiple of the number of PDMA pattern vector group rows of the uplink transmit power of the OFDMA user, and the power control pattern matrix should enable the PDMA user to occupy resources.
  • the transmission power of the smallest unit is equal to the multiple of the number of PDMA pattern vector group lines of the transmission power of the minimum unit occupied by the OFDMA user.
  • the method further includes:
  • the uplink transmit power unit is configured to determine an uplink transmit power of each user on a unit PRB by using an uplink power control mode.
  • An embodiment of the present disclosure provides a system for allocating uplink power, including: a base station and a receiving end; the base station includes a device for allocating uplink power, where the device includes:
  • a pairing unit configured to determine a user that needs to be paired according to a location of a different type of user in the cell
  • a power control pattern matrix unit configured to determine a PDMA pattern matrix, assign a different PDMA pattern vector group to each user, and form a power control pattern matrix according to the PDMA pattern vector group;
  • An uplink transmit power unit configured to determine a power control factor of each user, and determine an uplink transmit power of each user
  • the serial interference deletion method can be adopted, and the user who demodulates correctly is deleted first, and then the other users are detected.
  • the advantage of using this scheme is that the multi-user uplink transmission PDMA technology distinguishes between the coding domain and the power domain, and performs superposition transmission on the same time domain, frequency domain, and airspace resources, which can improve the number of uplink access users. And to improve the spectrum efficiency of the cell and edge users, on the other hand, it will also introduce interference between multiple users leading to uplink IoT uplift.
  • Reasonable design of the uplink power control scheme can enable the PDMA system to obtain greater system performance improvement than the OFDMA system, which not only can reduce the power consumption of the terminal, but also can improve the number of cell access users and improve the spectrum efficiency of the cell average and edge users.

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Abstract

本公开实施例提供一种分配上行功率的方法、设备和系统。所述分配上行功率的方法包括：根据用户在小区内的位置，确定需要配对的用户；确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；根据所述功率控制图样矩阵确定一个配对中每个用户的功率控制因子，根据所述功率控制因子确定每个用户的上行发射功率。

Description

分配上行功率的方法、设备和系统
相关申请的交叉引用
本申请主张在2015年8月3日在中国提交的中国专利申请号No.201510482803.X的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及无线通信的技术，特别是指一种分配上行功率的方法、设备和系统。
背景技术
与相关技术中的时分多址(TDMA，Time Division Multiple Access)、频分多址(FDMA，Frequency Division Multiple Access)、码分多址(CDMA，Code Division Multiple Access)接入技术类似，图样分割多址接入(PDMA，Patten Division Multiple Access)技术作为第五代无线通信系统(5th Generation(5G)wireless communication systems)的关键技术，支持多用户在相同的时域、频域、空域资源上传输，并通过编码域和功率进行用户间的区分，以提升小区平均和边缘用户频谱效率，以及提高小区接入用户数。
长期演进(LTE，Long Term Evolution)系统上行链路采用功率控制技术，为保证系统具有良好的前向兼容性，预期未来5G上行链路仍然沿用上行功率控制技术确定终端上行发射功率。由于PDMA在编码域和功率域上是叠加传输的，因此，也会对终端上行发射功率有影响。
相关技术中的LTE上行功率控制采用开环估计结合闭环调整，开环估计根据配置的期望接收功率、上行资源分配、传输格式、路径损耗等参数为终端确定上行发射功率初值，而后由基站下发的功率控制命令进行实时闭环调整。在开环确定上行发射功率部分引入部分路损补偿，以降低小区边缘用户上行发射功率过大对相邻小区的干扰。以LTE上行共享信道(PUSCH，Physical Uplink Shared Channel)为例，上行发射功率由PPUSCH(i)＝min{10log10(MPUSCH(i))+P0_PUSCH(j)+α(j)·PL+ΔTF(i)+f(i)，PCMAX}确定，其中， PPUSCH(i)表示终端在子帧i上的上行发射功率，MPUSCH(i)表示PUSCH在子帧i上分配的资源大小，以资源块数目表示，P0_PUSCH(j)表示PUSCH功率初始值，j与PUSCH传输/重传的调度许可相关，α(j)表示路损补偿因子，PL表示路径损耗，由参考信号估计得到，ΔTF(i)表示子帧i上与MCS相关的功率调整，f(i)表示当前功率调整，PCMAX表示终端的最大上行发射功率。
5G系统中，PDMA技术与上行功率控制技术联合使用时，由于多用户在相同的时频资源上进行传输，依靠编码和功率的不同来区分用户，因此，可能导致系统干扰噪声比值(IoT，Interference over Thermal)抬升，进而影响终端功耗、小区接入用户数、小区平均和边缘用户频谱效率。如何为每个用户在已分配的PDMA码本图样上调整功率，以避免较大系统IoT抬升，同时提升小区平均频谱效率、边缘用户频谱效率、接入用户数等系统性能，是应用PDMA技术遇到的问题。
相关技术存在如下问题：相关技术中的LTE系统上行功率控制每个终端在每个资源块(PRB，Physical Resource Block)上的发射功率，若PDMA技术与上行功率控制技术联合使用，仍然采用相关技术中的上行功率控制方式，不仅会使上行检测复杂度变高，而且可能导致终端上行发射功率过大甚至超过终端最大上行发射功率，进而引起上行较大的IoT抬升，导致接入用户数减少，小区和边缘用户频谱效率降低。
发明内容
本公开要提供一种分配上行功率的方法、设备和系统，以解决相关技术中，PDMA技术与上行功率控制技术联合使用时，PDMA码本采用不同的功率控制方式，将导致不同的系统IoT抬升，进而会影响PDMA技术应用时的系统性能的技术问题。
为解决上述技术问题，本公开的实施例在一个方面中提供一种实现上行功率控制的方法，应用于基站，所述基站形成至少一个小区，方法包括：根据用户在小区内的位置，确定需要配对的用户；确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；根据所述功率控制图样矩阵确定一个配对中每个用户的功 率控制因子，根据所述功率控制因子确定每个用户的上行发射功率。
可选地，确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据PDMA图样矢量组形成功率控制图样矩阵包括：根据小区总的用户数和系统总的资源，选定PDMA上行的PDMA图样矩阵HPDMA(M*N)，M是PDMA图样矩阵的行数，N是PDMA图样矩阵的列数；采用PDMA图样矩阵与功率控制因子矩阵
Figure PCTCN2016085289-appb-000001
计算出每个用户的PDMA图样矢量组，形成功率控制图样矩阵
Figure PCTCN2016085289-appb-000002
K表示上行配对用户数，N1，N2，…，NK分别表示用户1，2，…，K占用PDMA图样矩阵的列数，N＝N1+N2+…+NK，A1，A2，…，AK分别表示用户1，2，…，K的功率控制图样矢量组，□表示矩阵的点乘。
可选地，根据所述功率控制图样矩阵确定一个配对中每个用户的功率控制因子包括：选定上行功率控制优化模式；对于每一个用户当前的PDMA图样矢量组和功率控制因子组合，根据比例公平(PF，Proportional Fair)加权和吞吐量最大的准则是
Figure PCTCN2016085289-appb-000003
且满足||A||1＝1进行调整，使多用户配对之后单位功耗的PF加权和吞吐量最大，其中，Tk(SINRk，A)表示用户k在功率控制图样矩阵为A时的传输速率，由用户k的信干噪比(SINR，Signal to Interference plus Noise Ratio)和占用资源映射得到的传输比特数计算而来，用户k的SINR取值与PDMA图样矩阵中功率控制因子相关，BLERk(SINRk，A)表示用户k在功率控制图样矩阵为A时预估的误块率(BLER，BLock Error Rate)，由SINR和BLER映射关系得到，
Figure PCTCN2016085289-appb-000004
表示用户k在t时刻的历史平均速率，Pt(||Ak||1)表示用户k的功率控制图样矩阵为A时的总上行发射功率，Pt(||Ak||1)小于或等于用户终端的最大上行发射功率Pmax，||·||1表示对所有矩阵元素求和；历史平均速率计算公式是
Figure PCTCN2016085289-appb-000005
其中，
Figure PCTCN2016085289-appb-000006
表示用户k的当前时刻的统计得到的历史平均速率，
Figure PCTCN2016085289-appb-000007
表示用户k前一时刻统计得到的历史平均速率，Rk(t)表示用户k的当前速率，α表示遗忘因子，当取值为1时，表示PF加权和吞吐量仅与用户当前速率相关。
可选地，根据所述功率控制图样矩阵确定一个配对中每个用户的功率控 制因子包括：选定上行功率控制简化模式；根据用户的上行发射功率与正交频分多址(OFDMA，Orthogonal Frequency Division Multiple Access)用户上行发射功率的比值不同，采用确定功率控制图样矩阵的第一简化模式或者第二简化模式中的一种：第一简化模式，用户上行发射功率与OFDMA用户上行发射功率相等，则用户占用资源的最小单位为一个PDMA图样矢量组，一个PDMA图样矢量组允许占用多个PRB，而OFDMA用户占用资源的最小单位为一个PRB；第二简化模式，用户上行发射功率是OFDMA用户上行发射功率的PDMA图样矢量组行数的倍数，功率控制图样矩阵应使PDMA用户占用资源的最小单位的发射功率等于OFDMA用户占用资源的最小单位的发射功率的PDMA图样矢量组行数的倍数。
可选地，确定需要配对的用户之后还包括：采用上行功率控制方式，确定每个用户在单位PRB上的上行发射功率。
本公开的实施例在另一个方面中提供一种实现上行功率控制的设备，包括：配对单元，用于根据用户在小区内的位置，确定需要配对的用户；功率控制图样矩阵单元，用于确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；上行发射功率单元，用于确定每个用户的功率控制因子，确定每个用户的上行发射功率。
可选地，功率控制图样矩阵单元包括：PDMA图样矩阵模块，用于根据小区总的用户数和系统总的资源，确定PDMA图样矩阵为HPDMA(M*N)，M表示PDMA图样矩阵的行数，N表示PDMA图样矩阵的列数；功率控制图样矩阵选定模块，用于采用PDMA图样矩阵与功率控制因子矩阵
Figure PCTCN2016085289-appb-000008
计算出每个用户的PDMA图样矢量组，形成功率控制图样矩阵
Figure PCTCN2016085289-appb-000009
K表示上行PDMA配对用户数，N1，N2，…，NK分别表示用户1，2，…，K占用PDMA图样矩阵的列数，N＝N1+N2+…+NK，A1，A2，…，AK分别表示用户1，2，…，K的功率控 制图样矢量组，□表示矩阵的点乘。
可选地，所述上行发射功率单元包括：上行模式选定模块，用于选定上行功率控制优化模式；优化功率控制图样矩阵计算模块，用于对于每一个用户当前的PDMA图样矢量组和功率控制因子组合，根据单位功耗的PF加权和吞吐量最大的准则
Figure PCTCN2016085289-appb-000010
且满足||A||1＝1进行调整，Tk(SINRk，A)表示用户k在功率控制图样矩阵为A时的传输速率，由用户k的SINR和占用资源映射得到的传输比特数计算而来，用户k的SINR取值与PDMA图样矩阵中功率控制因子相关，BLERk(SINRk，A)表示用户k在功率控制图样矩阵为A时预估的误块率，由SINR和BLER映射关系得到，
Figure PCTCN2016085289-appb-000011
表示用户k在t时刻的历史平均速率，Pt(||Ak||1)表示用户k功率控制图样矩阵为A时的总上行发射功率，Pt(||Ak||1)小于或等于用户终端的最大上行发射功率Pmax，||·||1表示对矩阵元素求和；对于任意用户k，历史平均速率计算公式是
Figure PCTCN2016085289-appb-000012
其中，
Figure PCTCN2016085289-appb-000013
表示用户k的当前时刻的统计得到的历史平均速率，
Figure PCTCN2016085289-appb-000014
表示用户k前一时刻统计得到的历史平均速率，Rk(t)表示用户k的当前速率，α表示遗忘因子，当取值为1时，表示PF因子仅与用户当前速率相关。
可选地，所述上行模式选定模块还用于选定上行功率控制简化模式，并且所述上行发射功率单元还包括：上行发射功率控制方式选定模块，用于根据用户的上行发射功率与OFDMA用户上行发射功率的比值不同，采用确定功率控制图样矩阵的第一简化模式或者第二简化模式中的一种：第一简化模式，用户上行发射功率与OFDMA用户上行发射功率相等，用户资源占用的最小单位为一个PDMA图样矢量组，一个PDMA图样矢量组可能占用多个PRB，而OFDMA资源占用的最小单位为一个PRB；第二简化模式，用户上行发射功率是OFDMA用户上行发射功率的PDMA图样矢量组行数的倍数，功率控制图样矩阵应使PDMA用户占用资源的最小单位的发射功率等于OFDMA用户占用资源的最小单位的发射功率的PDMA图样矢量组行数的倍数。
可选地，所述的设备还包括：上行发射功率单元，用于采用上行功率控制方式，确定每个用户在单位PRB上的上行发射功率。
本公开的实施例在另一个方面中提供一种分配上行功率的系统，包括：基站、接收端；所述基站包括一种分配上行功率的设备，设备包括：配对单 元，用于根据不同种类的用户在小区内的位置，确定需要配对的用户；功率控制图样矩阵单元，用于确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；上行发射功率单元，用于确定每个用户的功率控制因子，确定每个用户的上行发射功率；接收端，用于采用串行干扰删除方法，先将解调正确的用户进行删除，然后，对其他用户进行检测。
本公开的上述技术方案的有益效果如下：在PDMA与LTE系统的上行功率控制技术在联合使用过程中，提供了如何确定终端的上行发射功率的技术，降低了终端功耗，提升上行小区平均和边缘用户频谱效率，提高小区接入用户数。
附图说明
为了更清楚地说明本申请实施例或相关技术中的技术方案，下面将对实施例或相关技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请中记载的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。以下附图并未刻意按实际尺寸等比例缩放绘制，重点在于示出本申请的主旨。
图1表示一种实现上行功率控制的方法流程示意图；
图2表示PDMA技术与上行功率控制技术联合使用时的上行功率控制实现流程图；
图3表示用户上行发射功率与OFDMA用户上行发射功率相等的示意图；以及
图4表示用户上行发射功率是OFDMA用户上行发射功率的PDMA图样矢量组行数的倍数的示意图。
具体实施方式
为使本公开的实施例的目的、技术方案和优点更加清楚，下面将结合本公开的实施例的附图，对本公开的实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基 于所描述的本公开的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开文本保护的范围。
PDMA作为一种新型非正交多址接入技术，利用多用户信道的非对称性，通过设计多用户不等分集的稀疏编码矩阵和编码调制联合优化模式，在时域、频域、码域、功率域和空域等多维信号域上进行映射，形成区分多用户的非正交码本图样，实现时域、频域、码域、功率域和空域等多维度的非正交信号叠加传输，从而实现更多用户复用和更高的分集增益。对于码域叠加传输，多用户在相同时频资源上通过编码矩阵的列来进行区分；对于功率域叠加传输，多用户在相同时频资源上通过不同的发射功率来进行区分；对于空域叠加传输，多用户在相同时频资源上利用空间中通过不同的数据流来进行区分。
PDMA技术可以使多用户在相同的时域、频域和空域资源上进行传输。5G系统中，PDMA技术与上行功率控制技术联合使用时，由于多用户在相同的时频资源上进行传输，依靠编码和功率的不同来区分用户，因此，可能导致系统IoT抬升，进而影响终端功耗、小区接入用户数、小区平均和边缘用户频谱效率。为此，本公开实施例提供一种实现上行功率控制的方法，如图1所示，所述方法包括：
步骤101，根据用户在小区内的位置，确定需要配对的用户；
步骤102，确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据PDMA图样矢量组形成功率控制图样矩阵，以及，根据所述功率控制图样矩阵确定每个用户的上行发射功率；该处的分配PDMA图样矢量组是指每个用户占用一列或列PDMA图样矩阵，该处分配随机分配即可，只要能找到使单位功耗PF加权和吞吐量最大即可；
步骤103，遍历所有用户的不同PDMA图样矢量组和功率控制因子组合，找到使单位PRB功耗的PF加权和吞吐量最小的组合，确定此时每个用户的上行发射功率。
应用所提供的技术，在PDMA与LTE系统的上行功率控制技术在联合使用过程中，提供了如何确定终端的上行发射功率的技术，降低了终端功耗，提升上行小区平均和边缘用户频谱效率，提高小区接入用户数。依靠编码域和功率域的不同来区分用户，即为不同用户分配不同的PDMA码本图样和功 率，进而达到提升小区平均频谱效率、边缘用户频谱效率、接入用户数等系统性能的目的。
在至少一个可选实施例中，步骤101之后，还包括：采用相关技术中的上行功率控制方式，确定每个用户在单位PRB上的上行发射功率。
在至少一个可选实施例中，遍历所有用户的不同PDMA图样矢量组和功率控制因子组合，找到使所述单位PRB功耗的PF加权和吞吐量最大的组合包括：
计算多用户配对之后单位功耗的PF加权和吞吐量，若单位功耗的PF加权和吞吐量与之前计算出的PF加权和吞吐量相比不是最大，重新执行下述步骤：为每个用户分配不同的PDMA图样矢量组，根据PDMA图样矢量组形成功率控制图样矩阵，以及，根据所述功率控制图样矩阵确定每个用户的上行发射功率。
PDMA技术与上行功率控制技术联合使用时的关键在于选择功率控制图样矩阵和确定用户上行发射功率，根据选择功率控制图样矩阵和确定用户上行发射功率的复杂度的不同，不同的实施例给出优化和简化两种实现方案。
优化方案的基本思想为采用穷搜的方式，为此，步骤102中，在至少一个可选实施例中，根据PDMA图样矢量组形成功率控制图样矩阵，以及，根据所述功率控制图样矩阵确定每个用户的上行发射功率包括：遍历所有配对的用户，为每个用户分配不同的PDMA图样矢量组和上行发射功率，以及所有可能的功率控制图样矩阵，使多用户配对之后的功耗最低，且单位功耗的PF加权和吞吐量最大。
在至少一个可选实施例中，确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据PDMA图样矢量组形成功率控制图样矩阵包括：
根据小区总的用户数和系统总的资源，选定PDMA上行的PDMA图样矩阵HPDMA(M*N)，M是PDMA图样矩阵的行数，N是PDMA图样矩阵的列数；
采用PDMA图样矩阵与功率控制因子矩阵
Figure PCTCN2016085289-appb-000015
计算出每个用户的PDMA图样矢量组，形成功率控制图样矩阵
Figure PCTCN2016085289-appb-000016
K表示上行配对用户数，N1，N2，…，NK分别表示用户1，2，…，K占用PDMA图样矩阵的列数，N＝N1+N2+…+NK，A1，A2，…，AK分别表示用户1，2，…，K的功率控制图样矢量组，□表示矩阵的点乘。每个用户的功率控制因子是其占用PDMA图样矩阵行列元素之和。
PDMA技术与上行功率控制技术联合使用的主要目标是查找不同的功率控制因子组合，使多用户配对之后，单位功耗的PF加权和吞吐量最大，在至少一个可选实施例中，确定单位功耗的PF加权和吞吐量最大的准则是：
Figure PCTCN2016085289-appb-000017
其中，Tk(SINRk，A)表示用户k在功率控制图样矩阵为A时的传输速率，由用户k的SINR和占用资源映射得到的传输比特数计算而来，用户k的SINR取值与PDMA图样矩阵中功率控制因子相关，BLERk(SINRk，A)表示用户k在功率控制图样矩阵为A时预估的误块率，由SINR和BLER映射关系得到，
Figure PCTCN2016085289-appb-000018
表示用户k在t时刻的历史平均速率，Pt(||Ak||1)表示用户k功率控制图样矩阵为Ak时的总上行发射功率，Pt(||Ak||1)小于或等于用户终端的最大上行发射功率Pmax，||·||1表示对矩阵元素求和。
在确定单位功耗的PF加权和吞吐量最大的准则的过程中，涉及到了
Figure PCTCN2016085289-appb-000019
表示用户k在t时刻的历史平均速率，在至少一个可选实施例中，对于任意用户k，历史平均速率计算公式是：
Figure PCTCN2016085289-appb-000020
其中，
Figure PCTCN2016085289-appb-000021
表示用户k的当前时刻的统计得到的历史平均速率，
Figure PCTCN2016085289-appb-000022
表示用户k前一时刻统计得到的历史平均速率，Rk(t)表示用户k的当前速率，α表示遗忘因子，当取值为1时，表示PF因子仅与用户当前速率相关。
在一个应用场景中，PDMA技术与上行功率控制技术联合使用控制上行功率的流程如图2所示，包括：
步骤201，根据用户在小区内的位置，确定需要配对的用户。
步骤202，采用相关技术中的上行功率控制方式，确定每个用户在单位PRB上的上行发射功率。具体地，可以采用相关技术中的上行功率控制方式，确定每个用户在单位PRB上的上行发射功率。
步骤203，根据小区总的用户数和系统总的资源，确定PDMA图样矩阵。
步骤204，为每个用户分配不同的PDMA图样矢量组，以及，根据PDMA图样矢量组形成功率控制图样矩阵，此时，还可以根据功率控制图样矩阵确定每个用户的上行发射功率。
步骤205，计算多用户配对之后单位功耗的PF加权和吞吐量。
步骤206，判断单位功耗的PF加权和吞吐量是否最大，若单位功耗的PF加权和吞吐量与之前的结果相比不是最大，则返回步骤4，并为用户分配与之前不同的PDMA图样矢量组或功率控制因子；若是最大，转步骤207。
步骤207，确定、输出此时每个用户的上行发射功率。
步骤204～步骤206表明，需要遍历所有配对用户的不同PDMA图样矢量组和功率控制因子组合，找到使单位功耗的PF加权和吞吐量最小的组合。
优化模式下，查找最优功率控制图样矩阵时，首先要选择配对用户，然后为配对用户分配不同的功率控制因子矩阵，并结合PDMA图样矩阵得到功率控制图样矩阵，进一步判定该功率控制图样矩阵是否单位功耗PF加权和吞吐量最大，直到找到单位功耗PF加权和吞吐量最大的功率控制图样矩阵。
PDMA技术与上行功率控制技术联合使用时，在控制上行功率的过程中还可以采用简化模式，简化模式的基本思想是：保证每个用户的功率控制图样矩阵的列元素之和相等。
根据用户的上行发射功率与正交频分多址(OFDMA，Orthogonal Frequency Division Multiple Access)用户上行发射功率的比值不同，有两种选择功率控制图样矩阵的简化模式，在至少一个可选实施例中，确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据PDMA图样矢量组形成功率控制图样矩阵还包括：在简化模式中，根据用户的上行发射功率与OFDMA用户的上行发射功率的比值不同，采用确定功率控制图样矩阵的第一简化模式或者第二简化模式中的一种。
在至少一个可选实施例中，采用第一简化模式，用户的上行发射功率与 OFDMA用户的上行发射功率相等；用户资源占用的最小单位为一个PDMA图样矢量组，一个PDMA图样矢量组可能占用多个PRB，而OFDMA用户资源占用的最小单位为一个PRB。
以典型的3，7PDMA图样矩阵为例，用户占用资源的最小单位为3PRB。PDMA系统中用户资源占用的最小单位为PDMA图样矩阵的行数。OFDMA用户占用资源的最小单位为1PRB。第一简化模式的功率控制图样矩阵应使PDMA图样矢量组占用PRB的总上行发射功率等于OFDMA用户单PRB的上行发射功率。
在至少一个可选实施例中，采用第二简化模式，用户的上行发射功率是OFDMA用户的上行发射功率的PDMA图样矢量组行数的倍数。
以用户和OFDMA用户各占一个资源占用的最小单位为例，第二简化模式的功率控制图样矩阵应使PDMA图样矢量组占用PRB的总上行发射功率等于OFDMA用户单PRB的上行发射功率的PDMA图样矢量组行数的倍数。
假设上行资源全部占满，与OFDMA系统相比，对于第一简化模式而言，PDMA系统内的平均IoT的抬升是PDMA配对用户数与码本行数的比值的倍数；对于第二简化模式而言，PDMA系统内的平均IoT的抬升是PDMA配对用户数的倍数。虽然两种方式下IoT抬升不同，但两种方式的SINR相差较小，第一简化模式较第二简化模式，终端的功耗较低，但资源占用较低的情况下，由于第二简化模式上行发射功率较大，可有效提升小区和边缘用户频谱效率。
在一个应用场景中，PDMA技术与上行功率控制技术联合使用时的关键在于选择功率控制图样矩阵和确定用户上行发射功率，若采用简化模式，以PDMA图样矩阵[3，7]为例，PDMA码本是
Figure PCTCN2016085289-appb-000023
设定存在3个OFDMA用户，且每个用户的上行发射功率均为1，则OFDMA系统的总上行发射功率为3。设存在7个PDMA用户，采用第一简化模式和第二简化模式选择功率控制图样矩阵时，各用户在每个时频资源位置的功率控制因子不同：
对于第一简化模式，如图3所示，有若干个PDMA用户，分别是用户1、 用户2、用户3、用户4、用户5、用户6和用户7，每个PDMA用户的上行发射功率为1，与每个OFDMA用户的上行发射功率相等，PDMA系统的总上行发射功率为7。当PDMA和OFDMA系统满载的情况下，PDMA系统的平均IoT是OFDMA系统的7/3倍。
对于第二简化模式，如图4所示，有若干个PDMA用户，分别是用户1、用户2、用户3、用户4、用户5、用户6和用户7，每个用户的上行发射功率为3，是每个OFDMA用户上行发射功率的3倍，PDMA系统的总上行发射功率为21。当PDMA和OFDMA系统满载的情况下，PDMA系统的平均IoT是OFDMA系统的7倍。
两种简化模式满载情况下的IoT抬升不同，但若不考虑噪声，两种简化模式的SINR计算结果相同，均为7/3。系统资源占用率较低的情况下，由于第二简化模式中的用户的上行发射功率较高，因此可获得较大的系统性能抬升，但也会导致终端功耗增大。
本公开实施例提供一种实现上行功率控制的设备，包括：
配对单元，用于根据用户在小区内的位置，确定需要配对的用户；
功率控制图样矩阵单元，用于确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；
上行发射功率单元，用于确定每个用户的功率控制因子，确定每个用户的上行发射功率。
在至少一个可选实施例中，功率控制图样矩阵单元包括：
PDMA图样矩阵模块，用于根据小区总的用户数和系统总的资源，确定PDMA图样矩阵为HPDMA(M*N)，M表示PDMA图样矩阵的行数，N表示PDMA图样矩阵的列数；
功率控制图样矩阵选定模块，用于采用PDMA图样矩阵与功率控制因子矩阵
Figure PCTCN2016085289-appb-000024
计算出每个用户的PDMA图样矢量组，形成 功率控制图样矩阵
Figure PCTCN2016085289-appb-000025
K表示上行PDMA配对用户数，N1，N2，…，NK分别表示用户1，2，…，K占用PDMA图样矩阵的列数，N＝N1+N2+…+NK，A1，A2，…，AK分别表示用户1，2，…，K的功率控制图样矢量组，□表示矩阵的点乘。
在至少一个可选实施例中，上行发射功率单元包括：
上行模式选定模块，用于选定上行功率控制优化模式；
优化功率控制图样矩阵计算模块，用于对于每一个用户当前的PDMA图样矢量组和功率控制因子组合，根据单位功耗的PF加权和吞吐量最大的准则
Figure PCTCN2016085289-appb-000026
且满足||A||1＝1进行调整，Tk(SINRk，A)表示用户k在功率控制图样矩阵为A时的传输速率，由用户k的SINR和占用资源映射得到的传输比特数计算而来，用户k的SINR取值与PDMA图样矩阵中功率控制因子相关，BLERk(SINRk，A)表示用户k在功率控制图样矩阵为A时预估的误块率，由SINR和BLER映射关系得到，
Figure PCTCN2016085289-appb-000027
表示用户k在t时刻的历史平均速率，Pt(||Ak||1)表示用户k功率控制图样矩阵为A时的总上行发射功率，Pt(||Ak||1)小于或等于用户终端的最大上行发射功率Pmax，||·||1表示对矩阵元素求和；
对于任意用户k，历史平均速率计算公式是
Figure PCTCN2016085289-appb-000028
其中，
Figure PCTCN2016085289-appb-000029
表示用户k的当前时刻的统计得到的历史平均速率，
Figure PCTCN2016085289-appb-000030
表示用户k前一时刻统计得到的历史平均速率，Rk(t)表示用户k的当前速率，α表示遗忘因子，当取值为1时，表示PF因子仅与用户当前速率相关。
在至少一个可选实施例中，上行发射功率单元还包括：
所述上行模式选定模块，还用于选定上行功率控制简化模式；
上行发射功率控制方式选定模块，用于根据用户的上行发射功率与OFDMA用户上行发射功率的比值不同，采用确定功率控制图样矩阵的第一简化模式或者第二简化模式中的一种：
第一简化模式，用户上行发射功率与OFDMA用户上行发射功率相等，用户资源占用的最小单位为一个PDMA图样矢量组，一个PDMA图样矢量组可能占用多个PRB，而OFDMA资源占用的最小单位为一个PRB；
第二简化模式，用户上行发射功率是OFDMA用户上行发射功率的PDMA图样矢量组行数的倍数，功率控制图样矩阵应使PDMA用户占用资源 的最小单位的发射功率等于OFDMA用户占用资源的最小单位的发射功率的PDMA图样矢量组行数的倍数。
在至少一个可选实施例中，还包括：
上行发射功率单元，用于采用上行功率控制方式，确定每个用户在单位PRB上的上行发射功率。
本公开实施例提供一种分配上行功率的系统，包括：基站、接收端；所述基站包括一种分配上行功率的设备，设备包括：
配对单元，用于根据不同种类的用户在小区内的位置，确定需要配对的用户；
功率控制图样矩阵单元，用于确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；
上行发射功率单元，用于确定每个用户的功率控制因子，确定每个用户的上行发射功率；
接收端，可采用串行干扰删除方法，先将解调正确的用户进行删除，然后，对其他用户进行检测。
采用本方案之后的优势是：多用户上行传输PDMA技术在编码域和功率域上进行区分，而在相同的时域、频域、空域资源上进行叠加传输，一方面能够提升上行接入用户数，以及提高小区和边缘用户频谱效率，另一方面也会引入多用户之间的干扰导致上行IoT抬升。合理设计上行功率控制方案，能够让PDMA系统相对于OFDMA系统获得更大系统性能提升，不仅可以降低终端功耗，而且可以提高小区接入用户数，提升小区平均和边缘用户频谱效率。
以上所述是本公开的可选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。

Claims (13)

  1. 一种实现上行功率控制的方法，应用于基站，所述基站形成至少一个小区，其中所述方法包括：
    根据用户在小区内的位置，确定需要配对的用户；
    确定图样分割多址接入(PDMA，Patten Division Multiple Access)图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；
    根据所述功率控制图样矩阵确定一个配对中每个用户的功率控制因子，根据所述功率控制因子确定每个用户的上行发射功率。
  2. 根据权利要求1所述的方法，其中，确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据PDMA图样矢量组形成功率控制图样矩阵包括：
    根据小区总的用户数和系统总的资源，选定PDMA上行的PDMA图样矩阵HPDMA(M*N)，M是PDMA图样矩阵的行数，N是PDMA图样矩阵的列数；
    采用PDMA图样矩阵与功率控制因子矩阵
    Figure PCTCN2016085289-appb-100001
    计算出每个用户的PDMA图样矢量组，形成功率控制图样矩阵
    Figure PCTCN2016085289-appb-100002
    K表示上行配对用户数，N1，N2，…，NK分别表示用户1，2，…，K占用PDMA图样矩阵的列数，N＝N1+N2+…+NK，A1，A2，…，AK分别表示用户1，2，…，K的功率控制图样矢量组，□表示矩阵的点乘。
  3. 根据权利要求2所述的方法，其中，根据所述功率控制图样矩阵确定一个配对中每个用户的功率控制因子包括：
    选定上行功率控制优化模式；
    对于每一个用户当前的PDMA图样矢量组和功率控制因子组合，根据PF 加权和吞吐量最大的准则是
    Figure PCTCN2016085289-appb-100003
    且满足||A||1＝1进行调整，使多用户配对之后单位功耗的PF加权和吞吐量最大，其中，Tk(SINRk，A)表示用户k在功率控制图样矩阵为A时的传输速率，由用户k的信干噪比(SINR，Signal to Interference plus Noise Ratio)和占用资源映射得到的传输比特数计算而来，用户k的SINR取值与PDMA图样矩阵中功率控制因子相关，BLERk(SINRk，A)表示用户k在功率控制图样矩阵为A时预估的误块率(BLER，BLock Error Rate)，由SINR和BLER映射关系得到，
    Figure PCTCN2016085289-appb-100004
    表示用户k在t时刻的历史平均速率，Pt(||Ak||1)表示用户k的功率控制图样矩阵为A时的总上行发射功率，Pt(||Ak||1)小于或等于用户终端的最大上行发射功率Pmax，||·||1表示对矩阵元素求和；
    历史平均速率计算公式是
    Figure PCTCN2016085289-appb-100005
    其中，
    Figure PCTCN2016085289-appb-100006
    表示用户k的当前时刻的统计得到的历史平均速率，
    Figure PCTCN2016085289-appb-100007
    表示用户k前一时刻统计得到的历史平均速率，Rk(t)表示用户k的当前速率，α表示遗忘因子，当取值为1时，表示PF加权和吞吐量仅与用户当前速率相关。
  4. 根据权利要求2所述的方法，其中，根据所述功率控制图样矩阵确定一个配对中每个用户的功率控制因子包括：
    选定上行功率控制简化模式；
    根据用户的上行发射功率与正交频分多址(OFDMA，Orthogonal Frequency Division Multiple Access)用户上行发射功率的比值不同，采用确定功率控制图样矩阵的第一简化模式或者第二简化模式中的一种：
    在所述第一简化模式中，用户上行发射功率与OFDMA用户上行发射功率相等，则用户占用资源的最小单位为一个PDMA图样矢量组，一个PDMA图样矢量组允许占用多个资源块(PRB，Physical Resource Block)，而OFDMA用户占用资源的最小单位为一个PRB；
    在所述第二简化模式中，用户上行发射功率是OFDMA用户上行发射功率的PDMA图样矢量组行数的倍数，功率控制图样矩阵应使PDMA用户占用资源的最小单位的发射功率等于OFDMA用户占用资源的最小单位的发射功率的PDMA图样矢量组行数的倍数。
  5. 根据权利要求1所述的方法，其中，确定需要配对的用户之后还包括：
    采用上行功率控制方式，确定每个用户在单位PRB上的上行发射功率。
  6. 一种实现上行功率控制的设备，包括：
    配对单元，用于根据用户在小区内的位置，确定需要配对的用户；
    功率控制图样矩阵单元，用于确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；
    上行发射功率单元，用于确定每个用户的功率控制因子，确定每个用户的上行发射功率。
  7. 根据权利要求6所述的设备，其中，功率控制图样矩阵单元包括：
    PDMA图样矩阵模块，用于根据小区总的用户数和系统总的资源，确定PDMA图样矩阵为HPDMA(M*N)，M表示PDMA图样矩阵的行数，N表示PDMA图样矩阵的列数；
    功率控制图样矩阵选定模块，用于采用PDMA图样矩阵与功率控制因子矩阵
    Figure PCTCN2016085289-appb-100008
    计算出每个用户的PDMA图样矢量组，形成功率控制图样矩阵
    Figure PCTCN2016085289-appb-100009
    K表示上行PDMA配对用户数，N1，N2，…，NK分别表示用户1，2，…，K占用PDMA图样矩阵的列数，N＝N1+N2+…+NK，A1，A2，…，AK分别表示用户1，2，…，K的功率控制图样矢量组，□表示矩阵的点乘。
  8. 根据权利要求7所述的设备，其中，上行发射功率单元包括：
    上行模式选定模块，用于选定上行功率控制优化模式；
    优化功率控制图样矩阵计算模块，用于对于每一个用户当前的PDMA图样矢量组和功率控制因子组合，根据单位功耗的PF加权和吞吐量最大的准则
    Figure PCTCN2016085289-appb-100010
    且满足||A||1＝1进行调整，Tk(SINRk，A)表示用户k在功率控制图样矩阵为A时的传输速率，由用户k的SINR和占用资源映射得到的传输比特数计算而来，用户k的SINR取值与PDMA图样矩阵中功率控制因子相关，BLERk(SINRk，A)表示用户k在功率控制图样矩阵为A时预估的误块率，由SINR和BLER映射关系得到，
    Figure PCTCN2016085289-appb-100011
    表示用户k在t时刻的历 史平均速率，Pt(||Ak||1)表示用户k功率控制图样矩阵为A时的总上行发射功率，Pt(||Ak||1)小于或等于用户终端的最大上行发射功率Pmax，||·||1表示对矩阵元素求和；
    对于任意用户k，历史平均速率计算公式是
    Figure PCTCN2016085289-appb-100012
    其中，
    Figure PCTCN2016085289-appb-100013
    表示用户k的当前时刻的统计得到的历史平均速率，
    Figure PCTCN2016085289-appb-100014
    表示用户k前一时刻统计得到的历史平均速率，Rk(t)表示用户k的当前速率，α表示遗忘因子，当取值为1时，表示PF因子仅与用户当前速率相关。
  9. 根据权利要求7所述的设备，其中，所述上行模式选定模块还用于选定上行功率控制简化模式，并且所述上行发射功率单元还包括：
    上行发射功率控制方式选定模块，用于根据用户的上行发射功率与OFDMA用户上行发射功率的比值不同，采用确定功率控制图样矩阵的第一简化模式或者第二简化模式中的一种：
    在第一简化模式中，用户上行发射功率与OFDMA用户上行发射功率相等，用户资源占用的最小单位为一个PDMA图样矢量组，一个PDMA图样矢量组可能占用多个PRB，而OFDMA资源占用的最小单位为一个PRB；
    在第二简化模式中，用户上行发射功率是OFDMA用户上行发射功率的PDMA图样矢量组行数的倍数，功率控制图样矩阵应使PDMA用户占用资源的最小单位的发射功率等于OFDMA用户占用资源的最小单位的发射功率的PDMA图样矢量组行数的倍数。
  10. 根据权利要求8所述的设备，还包括：
    上行发射功率单元，用于采用上行功率控制方式，确定每个用户在单位PRB上的上行发射功率。
  11. 一种分配上行功率的系统，包括基站和接收端；所述基站包括一种分配上行功率的设备，所述设备包括：
    配对单元，用于根据不同种类的用户在小区内的位置，确定需要配对的用户；
    功率控制图样矩阵单元，用于确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；
    上行发射功率单元，用于确定每个用户的功率控制因子，确定每个用户 的上行发射功率；
    接收端，用于采用串行干扰删除方法，先将解调正确的用户进行删除，然后，对其他用户进行检测。
  12. 一种实现上行功率控制的设备，包括处理器、存储器和收发机，其中：
    处理器，用于读取存储器中的程序，执行下列过程：
    根据用户在小区内的位置，确定需要配对的用户；
    确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；
    确定每个用户的功率控制因子，确定每个用户的上行发射功率，
    收发机用于接收和发送数据，
    处理器负责管理总线架构和通常的处理，存储器能够存储处理器在执行操作时所使用的数据。
  13. 一种分配上行功率的系统，包括基站和接收端，所述基站包括一种分配上行功率的设备，
    所述设备包括处理器、存储器和收发机，其中：
    处理器，用于读取存储器中的程序，执行下列过程：
    根据不同种类的用户在小区内的位置，确定需要配对的用户；
    确定PDMA图样矩阵，为每个用户分配不同的PDMA图样矢量组，根据所述PDMA图样矢量组形成功率控制图样矩阵；
    确定每个用户的功率控制因子，确定每个用户的上行发射功率，
    收发机用于接收和发送数据，
    处理器负责管理总线架构和通常的处理，存储器能够存储处理器在执行操作时所使用的数据，
    所述接收端包括处理器、存储器和收发机，其中：
    处理器，用于读取存储器中的程序，执行下列过程：采用串行干扰删除方法，先将解调正确的用户进行删除，然后，对其他用户进行检测，
    收发机用于接收和发送数据，
    处理器负责管理总线架构和通常的处理，存储器能够存储处理器在 执行操作时所使用的数据。
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