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WO2018126776A1 - Procédé et dispositif de planification de terminal utilisateur, et système de communication - Google Patents

Procédé et dispositif de planification de terminal utilisateur, et système de communication Download PDF

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Publication number
WO2018126776A1
WO2018126776A1 PCT/CN2017/108430 CN2017108430W WO2018126776A1 WO 2018126776 A1 WO2018126776 A1 WO 2018126776A1 CN 2017108430 W CN2017108430 W CN 2017108430W WO 2018126776 A1 WO2018126776 A1 WO 2018126776A1
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Prior art keywords
user terminal
beam domain
scheduled
user
domain space
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PCT/CN2017/108430
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English (en)
Chinese (zh)
Inventor
韩亚洁
秦洪峰
李朝勇
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

Definitions

  • the present application relates to the field of communications, for example, to a user terminal scheduling method and apparatus, and a communication system.
  • the 3D MIMO (Multiple-Input Multiple-Output) technology uses the method of configuring the active array antenna at the base station to introduce vertical dimension information based on the relevant two-dimensional channel model, which breaks through the conventional MIMO fixed.
  • the embodiments of the present disclosure provide a user terminal scheduling method and apparatus, and a communication system, to provide a multi-user scheduling method suitable for a 3D MIMO system.
  • a user terminal scheduling method including:
  • the user terminal to be scheduled is mapped to each beam domain space according to the downlink channel estimation information and the spatial attributes of the current beam space of the base station, and the capacity performance estimation result of the user terminal to be scheduled in each beam domain space is obtained;
  • the user terminal to be scheduled is scheduled in each beam domain space
  • a user terminal scheduling apparatus including: a computing module and a scheduling module, where
  • the calculation module is configured to obtain downlink channel estimation information of the user terminal to be scheduled; and to map the user terminal to be scheduled to each beam domain space according to the downlink channel estimation information and the spatial attributes of each beam domain space of the current base station, and obtain the user terminal to be scheduled Capacity performance estimation results for each beam domain space;
  • the scheduling module is configured to: according to the capacity performance estimation result of the user terminal to be scheduled in each beam domain space, the user terminal to be scheduled is scheduled in each beam domain space; and the weight information of the user terminal to be scheduled in each beam domain space is obtained, according to the right The value information is used for downlink data transmission.
  • a communication system including a base station, the base station is provided with an active antenna plane array, and the base station further includes a user terminal scheduling apparatus provided by an embodiment of the present disclosure.
  • a computer storage medium in another aspect, storing computer executable instructions for executing the aforementioned user terminal scheduling method.
  • An embodiment of the present disclosure further provides an electronic device, including:
  • At least one processor At least one processor
  • the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform the method described above.
  • the embodiment of the present disclosure provides a user terminal scheduling method, which is based on the three-dimensional channel characteristics, uses the spatial sparsity of the three-dimensional channel, and maps the user downlink channel into different beam domain spaces, and determines the beam domain direction based on the threshold.
  • the spatial freedom of the three-dimensional channel is utilized to achieve a more accurate separation of the user in the spatial domain.
  • the base station uses the beam domain information fed back by the user for a long time to schedule users whose beams are orthogonal to each other, and determines a set of scheduling users.
  • the present disclosure can fully utilize the present disclosure.
  • the spatial freedom of the three-dimensional channel and the scheduling algorithm with low complexity and low feedback overhead significantly improve system throughput.
  • FIG. 1 is a flowchart of a method for scheduling a user terminal according to a first embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a user terminal scheduling apparatus according to a second embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of networking of a communication system according to a third embodiment of the present disclosure.
  • FIG. 4 is a schematic flowchart of a terminal scheduling process according to a third embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram of throughput simulation when different threshold values are involved in the third embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of throughput simulation of different algorithms involved in the third embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.
  • the user terminal scheduling method provided in this embodiment includes:
  • S101 Acquire downlink channel estimation information of the user terminal to be scheduled.
  • S102 Mapping the to-be-scheduled user terminal to each beam domain space according to the downlink channel estimation information and the spatial attributes of the current beam space of the base station, and obtaining a capacity performance estimation result of the user terminal to be scheduled in each beam domain space;
  • S104 Acquire weight information of the user terminal to be scheduled in each beam domain space, and perform downlink data transmission according to the weight information.
  • the user terminal scheduling method in the foregoing embodiment before acquiring the downlink channel estimation information of the user terminal to be scheduled, further includes:
  • the system model comprising a number of antenna elements of the base station active antenna array plane in the horizontal and vertical directions, respectively, and N h N v a number, there are K user terminals to be scheduled in the cell, wherein each The user terminal has N r antennas, and the downlink channel matrix of each user terminal k (1 ⁇ k ⁇ K) is The emission correlation matrix is
  • the beam domain mapping matrix is constructed.
  • the estimation results of the capacity performance of the user terminal to be scheduled in each beam domain space in the foregoing embodiment include:
  • scheduling the user terminals to be scheduled in the beam space in the foregoing embodiment includes:
  • performing downlink data transmission according to the weight information in the foregoing embodiment includes:
  • the same time-frequency resources are used for transmission;
  • time-frequency resources without overlapping are used for transmission.
  • the user terminal scheduling apparatus provided in this embodiment includes: a calculation module 21 and a scheduling module 22, where
  • the calculation module 21 is configured to acquire downlink channel estimation information of the user terminal to be scheduled, and map the user terminal to be scheduled to each beam domain space according to the downlink channel estimation information and the spatial attributes of each beam domain space of the current base station to obtain a user terminal to be scheduled. Capacity performance estimation results in each beam domain space;
  • the scheduling module 22 is configured to: according to the capacity performance estimation result of the user terminal to be scheduled in each beam domain space, the user terminal to be scheduled is scheduled in each beam domain space; and the weight information of the user terminal to be scheduled in each beam domain space is obtained, according to The weight information is used for downlink data transmission.
  • the user equipment scheduling apparatus in the foregoing embodiment further includes a modeling module 23 configured to acquire a system model of the current base station before acquiring downlink channel estimation information of the user terminal to be scheduled.
  • the system model includes the active antenna plane array of the base station, and the number of antenna elements in the horizontal and vertical directions is N h and N v respectively, and there are K user terminals to be scheduled in the cell, wherein each user terminal has N r roots Antenna, the downlink channel matrix of each user terminal k (1 ⁇ k ⁇ K) is The emission correlation matrix is According to the system model, the beam domain mapping matrix is constructed.
  • the computing module 21 in the above embodiment is configured to:
  • the scheduling module 22 in the above embodiment is configured to:
  • the scheduling module 22 in the foregoing embodiment is configured to use the same time-frequency resource for the user terminal in the same beam domain space, and for the scheduled users in different beam domain spaces, when there is no overlap. Frequency resources are transmitted.
  • the embodiment of the present disclosure further provides a communication system including a base station, the base station is provided with an active antenna plane array, and the base station further includes a user terminal scheduling device as shown in FIG. 2.
  • all the functional modules in the embodiment shown in FIG. 2 can be implemented by using a processor, an editing logic device, or the like.
  • This embodiment is described by taking a simple FDD (Frequency Division Duplexing) communication system as an example.
  • FDD Frequency Division Duplexing
  • the 3D MIMO system configures an active antenna plane array through a base station, which can fully utilize the horizontal and vertical spatial degrees of freedom provided by multiple antennas, thereby accurately directing the beam to the service user, thereby reducing multi-user downlink. Inter-user interference during transmission.
  • the multi-user downlink transmission requires the base station to obtain the channel information of all the users to be served.
  • the base station is configured with a large number of antennas, the feedback overhead of the user is greatly increased. Therefore, the three-dimensional multi-user downlink transmission under FDD is 3D. An important research direction in MIMO.
  • This embodiment discloses a three-dimensional multi-user scheduling and transmission method in an FDD system.
  • the downlink channel of the user is mapped into different beam domain spaces, and the base station uses the feedback beam domain information to schedule.
  • the users whose beams are orthogonal to each other and the downlink precoding design realize multi-user downlink transmission.
  • the scheme significantly improves the system throughput performance.
  • the three-dimensional channel spatial domain information is finely divided by the configuration of multiple beam domain spaces, and the beams in each beam domain space are orthogonal to each other, and can be used as a transmission direction for downlink precoding.
  • the user's downlink channel is mapped into different beam domain spaces, and the beam domain direction is determined based on the threshold, and the spatial freedom of the three-dimensional channel can be fully utilized to realize the user's spatial domain.
  • the base station uses the beam domain information fed back by the user for a long time to schedule users whose beams are orthogonal to each other to determine a set of scheduling users; again, based on the current channel matrix, the selected beam is obtained by instantaneously feedback beam domain weight information
  • Real-time linear merging of the domain direction allows the signal to be more concentrated to the user.
  • a feedback strategy combining long-term feedback and instantaneous feedback is adopted, which can fully utilize the spatial freedom of the three-dimensional channel, and significantly improve the system throughput by using a low complexity and low feedback overhead scheduling and precoding algorithm.
  • the technical solution adopted in this embodiment includes the following steps:
  • V i is its rotation matrix as follows:
  • B n is the nth beam domain mapping matrix, corresponding to the beam domain space in which the nth included beam directions are orthogonal to each other, and each column corresponds to one beam direction.
  • Beam domain mapping of three-dimensional channel information taking the operation of user k on the nth beam domain space as an example.
  • the average beam capacity in the beam space, the set C ⁇ C 1 C 2 ... C N ⁇ is the average beam capacity of all users in all beam directions.
  • the base station searches for the largest element in set C, assuming That is, the average beam capacity of the user p in the mth beam domain space;
  • the same resource time-frequency resources are used for transmission, and the scheduled users in different beam domain spaces are transmitted by orthogonal resources without overlapping time-frequency resources.
  • the transmission in the nth beam domain space Take the transmission in the nth beam domain space as an example:
  • the selected beam direction can be expressed as That is, the number in B n Column, calculate its weight vector in the direction of the selected beam
  • v k is a right singular vector corresponding to the largest singular value after the singular value decomposition of the channel matrix H k .
  • P is the total transmit power of the base station in the beam space
  • L is the number of users scheduled
  • x i is the modulation signal sent by the base station to the ith user
  • n k is the noise vector.
  • Figure 5 is a graph showing the throughput performance under different thresholds when the base station is an 8*4 (horizontal*vertical) antenna.
  • the optimal threshold is between 0.6 and 0.7. If the threshold is too small, the beam direction selected by each user is reduced, resulting in a large interference. The beam direction is multiplexed by other users, and the signal to interference and noise ratio is also reduced.
  • the number of users that can be scheduled increases each time, the spectral efficiency of each user decreases as the signal to interference and noise ratio decreases, resulting in throughput.
  • the threshold is too large, the beam direction selected by each user becomes larger, and the total number of orthogonal beam directions that the system can schedule is fixed (the same number as the number of base station antennas), so that each time The number of users scheduled is reduced, resulting in a decrease in total throughput.
  • the system performance will be greatly improved. This is because the increase in the number of schedulable users enables the base station to select users with better spatial sparsity and larger beam average capacity for scheduling. , thereby improving the performance of the scheduling algorithm.
  • Figure 6 shows an 8*4 (horizontal*vertical) antenna for a base station.
  • the algorithm proposed by the present disclosure has a certain performance compared to the performance of the zero-forcing algorithm under ideal feedback, but this is at the cost of great feedback overhead, and the zero-forcing algorithm compared to the limited feedback (here)
  • the direct product of two 8-bit DFT codebooks is used to form a 16-bit direct product DFT codebook as a feedback codebook.
  • the performance is improved because the proposed scheme can better utilize the space of the three-dimensional channel. Sparseness, feedback more accurate channel information for scheduling.
  • 201410531274.3 is applicable to the line-of-sight environment or when the beam direction selected by the user is 1, and when the selected beam direction is greater than 1, the multiple beams are caused by the feedback of the instantaneous channel information.
  • the weight between the two cannot be accurately known, which makes the performance degraded.
  • the feedback overhead is minimal, the scheme is only applicable to the line-of-sight environment or an environment requiring extremely low feedback overhead.
  • the long-term CQI feedback is performed according to the LTE standard, and the feedback overhead is 4 bits, and the long-term PMI feedback overhead is the number of beam domain spaces * the number of beams selected by the user * log 2 (Nt), wherein the number of beam domain spaces is increased.
  • the feedback overhead of the instantaneous PMI is related to the number of beams selected by the user.
  • the instantaneous PMI is not needed.
  • Feedback when it is greater than 1, the feedback overhead increases accordingly, where the number of feedback bits is set to be the same as the number of beams selected by the user.
  • the channel sparsity-based three-dimensional multi-user scheduling and transmission method under the FDD system of the present disclosure can significantly improve the system throughput performance.
  • the embodiment of the present disclosure provides a user terminal scheduling method, which is based on the three-dimensional channel characteristics, uses the spatial sparsity of the three-dimensional channel, and maps the user downlink channel into different beam domain spaces, and determines the beam domain direction based on the threshold.
  • the spatial freedom of the three-dimensional channel is utilized to achieve a more accurate separation of the user in the spatial domain.
  • the base station uses the beam domain information fed back by the user for a long time to schedule users whose beams are orthogonal to each other, and determines a set of scheduling users.
  • the present disclosure can fully utilize the present disclosure.
  • the spatial freedom of the three-dimensional channel and the scheduling algorithm with low complexity and low feedback overhead significantly improve system throughput.
  • Embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • an embodiment of the present disclosure provides a computer readable storage medium storing computer executable instructions arranged to perform the method of any of the above embodiments.
  • the computer readable storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
  • the embodiment of the present disclosure further provides a schematic structural diagram of an electronic device.
  • the electronic device includes:
  • At least one processor 70 which is exemplified by a processor 70 in FIG. 7; and a memory 71, may further include a communication interface 72 and a bus 73.
  • the processor 70, the communication interface 72, and the memory 71 can complete communication with each other through the bus 73.
  • Communication interface 72 can be used for information transfer.
  • Processor 70 can invoke logic instructions in memory 71 to perform the methods of the above-described embodiments.
  • logic instructions in the memory 71 described above may be implemented in the form of a software functional unit and sold or used as a stand-alone product, and may be stored in a computer readable storage medium.
  • the memory 71 is a computer readable storage medium, and can be used to store a software program, a computer executable program, a program instruction/module corresponding to the method in the embodiment of the present disclosure.
  • the processor 70 executes the function application and the data processing by running the software program, the instruction and the module stored in the memory 71, that is, the user terminal scheduling method in the above method embodiment.
  • the memory 71 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function; the storage data area may store data created according to usage of the terminal device, and the like. Further, the memory 71 may include a high speed random access memory, and may also include a nonvolatile memory.
  • the technical solution of the embodiments of the present disclosure may be embodied in the form of a software product stored in a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network) The device or the like) performs all or part of the steps of the method described in the embodiments of the present disclosure.
  • the foregoing storage medium may be a non-transitory storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM, Random).
  • ROM read-only memory
  • RAM random access memory
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the user terminal scheduling method and device and the communication system provided by the embodiments of the present application can fully utilize the spatial freedom of the three-dimensional channel, thereby achieving a more accurate separation of the user in the spatial domain, and significantly improving the system throughput.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon certains modes de réalisation, la présente invention concerne un procédé et un dispositif de planification de terminal d'utilisateur ainsi qu'un système de communication. Le procédé consiste : à obtenir des informations d'estimation de canal de liaison descendante d'un terminal d'utilisateur à planifier ; à mapper le terminal d'utilisateur devant être planifié sur des espaces de domaine de faisceau selon les informations d'estimation de canal de liaison descendante et les attributs spatiaux des espaces de domaine de faisceau d'une station de base actuelle, et obtenir un résultat d'estimation de performance de capacité du terminal d'utilisateur à planifier dans les espaces de domaine de faisceau ; à planifier le terminal d'utilisateur à planifier dans les espaces de domaine de faisceau selon le résultat d'estimation de performance de capacité du terminal d'utilisateur à planifier dans les espaces de domaine de faisceau ; et à obtenir des informations de poids du terminal d'utilisateur à planifier dans les espaces de domaine de faisceau, et effectuer une transmission de données de liaison descendante selon les informations de poids. Selon la présente invention, le canal de liaison descendante d'un utilisateur est mappé avec différents espaces de domaine de faisceau à l'aide de la rareté d'un canal tridimensionnel, le degré de liberté spatial du canal tridimensionnel peut être pleinement utilisé, de telle sorte que la séparation précise de l'utilisateur sur un domaine spatial est mise en œuvre, et que le débit du système est considérablement amélioré.
PCT/CN2017/108430 2017-01-05 2017-10-30 Procédé et dispositif de planification de terminal utilisateur, et système de communication Ceased WO2018126776A1 (fr)

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