WO2014117730A1 - 一种用户调度方法及系统 - Google Patents

一种用户调度方法及系统 Download PDF

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Publication number
WO2014117730A1
WO2014117730A1 PCT/CN2014/071677 CN2014071677W WO2014117730A1 WO 2014117730 A1 WO2014117730 A1 WO 2014117730A1 CN 2014071677 W CN2014071677 W CN 2014071677W WO 2014117730 A1 WO2014117730 A1 WO 2014117730A1
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users
transmission
user
scheduled
type
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French (fr)
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王化磊
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China Mobile Communications Group Co Ltd
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China Mobile Communications Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • the present invention relates to a wireless communication technology, and in particular, to a user scheduling method and system.
  • the Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) communication system and the Time Division Long Term Evolution (TD-LTE) communication system employ Time Division Duplexing (Time Division Duplexing, In the TDD mode, a radio frame is divided into 10 sub-frames and used as a downlink sub-frame or an uplink sub-frame. The number of different downlink sub-frames and the number of uplink sub-frames are matched to match asymmetric uplink and downlink services.
  • TDD systems especially hotspots and indoors
  • low-power high-density cells such as a large number of pico base stations
  • the same-frequency full-duplex transmission technology based on low-power base stations is increasingly The deeper the attention.
  • the so-called same-frequency full-duplex the main idea ⁇ station in the same frequency band and sub-frame simultaneously send downlink data and receive uplink data, which can theoretically double the spectrum efficiency.
  • the same-frequency full-duplex needs to be configured with a receiving antenna and a transmitting antenna at the base station, and the base station needs to eliminate the interference caused by the transmitted signal when receiving the uplink signal.
  • 73dB interference cancellation has been achieved. If a directional antenna is used, 113dB interference can be eliminated, and thus the condition for real-time full-duplex transmission in a low-power base station application scenario is already available.
  • the same-frequency full-duplex transmission is generally not operated at the user end, but is implemented by the scheme shown in FIG. 1.
  • the base station simultaneously transmits and receives data of two different user terminals to improve the whole.
  • the transmission efficiency of the system specifically, the base station sends data to the UE1 in the same subframe, and receives the data sent by the UE2 in the same subframe.
  • applying the same-frequency full-duplex transmission scheme shown in Figure 1 to an existing system faces the following problems:
  • the base station transmits data to the downlink user while receiving the uplink user, so that the downlink transmission signal may interfere with the uplink received signal, thereby improving the requirement for the base station interference cancellation capability.
  • the main object of the present invention is to provide a user scheduling method and system, which can improve the communication efficiency of the TDD system and have lower requirements for the base station interference cancellation capability.
  • a user scheduling method which divides a user to be scheduled into two types: a first type of user and a second type of user, wherein a channel quality of the base station to the first type of user is higher than a channel quality of the second type of user.
  • the method includes:
  • the subframe used for full-duplex transmission schedules users for downlink transmission from the first type of users, or schedules users for uplink transmission from the second type of users.
  • the dividing the users to be scheduled into two categories includes:
  • the user to be scheduled is divided into the first type of users; if the RSRQ of the user to be scheduled is not greater than the preset threshold, the user to be scheduled is divided into The second type of user.
  • the scheduling type of each subframe in the determining scheduling period is:
  • the downlink user currently scheduled by the downlink subframe is the first type of user, or the uplink user currently scheduled by the uplink subframe is the second type of user, it is determined that the subframe is available for full duplex transmission; Selecting part or all of the subframes from the subframes available for full-duplex transmission for full-duplex transmission according to traffic demand, and determining downlink sub-frames other than the sub-frames for full-duplex transmission in the scheduling period
  • the frame is used for downlink transmission, and the uplink subframe is used for uplink transmission.
  • the user is scheduled to perform downlink transmission from the first type of users, or the user is scheduled to perform uplink transmission from the second type of users:
  • the user For the uplink subframe used for full-duplex transmission, the user is scheduled to perform downlink transmission from the first type of users; for the downlink subframe used for full-duplex transmission, the user is scheduled to perform uplink transmission from the second type of users.
  • the method further includes: determining, for the scheduled user, a minimum transmit power based on the quality of service QoS parameters.
  • the scheduling user performs uplink transmission or downlink transmission as:
  • the CQI index maximum criterion is scheduled according to the proportional fairness criterion, the maximum throughput criterion, or the channel quality indicator.
  • a user scheduling system includes: a classification module, a scheduling type determining module, and a scheduling module; wherein
  • the classification module is configured to divide the users to be scheduled into two types: a first type of users and a second type of users, where a channel quality of the base station to the first type of users is higher than a channel of the second type of users.
  • the scheduling type determining module is configured to determine a scheduling type of each subframe in the scheduling period; the scheduling module is configured to determine, according to the scheduling type, a result determined by the module, and for the uplink frame, the uplink user Scheduling users for uplink transmission; for subframes used for downlink transmission, scheduling users from downlink users for downlink transmission; for subframes used for full-duplex transmission, scheduling users from the first type of users for downlink transmission, or , scheduling users from the second type of users for uplink transmission.
  • the classifying module is configured to: when the RSRQ of the to-be-scheduled user is greater than a preset threshold, the user to be scheduled is divided into a first-type user; when the RSRQ of the user to be scheduled is not greater than a preset threshold, the The scheduling user is divided into the second type of users.
  • the scheduling type determining module is specifically configured to: when the downlink user currently scheduled in the downlink subframe is the first type of user, or when the uplink user currently scheduled in the uplink subframe is the second type of user, determining that the subframe is available for the whole Duplex transmission; thereafter, according to the traffic demand, select some or all subframes from the subframes available for full-duplex transmission for full-duplex transmission, and determine the sub-carriers for the full-duplex transmission in the scheduling period
  • the downlink subframes outside the frame are used for downlink transmission, and the uplink subframes are used for uplink transmission.
  • the scheduling module is specifically configured to schedule a downlink transmission from a first type of user to an uplink subframe used for full-duplex transmission, and a downlink subframe used for full-duplex transmission from a second type of user.
  • the user is scheduled to perform uplink transmission.
  • the scheduling module is further configured to determine a minimum transmit power to the scheduled user according to the service quality QoS parameter.
  • the scheduling module is specifically configured to perform scheduling according to a proportional fairness criterion, a maximum throughput criterion, or a channel quality indication CQI index maximum criterion.
  • the user scheduling method and system of the present invention divides the users to be scheduled into two categories: a first type of user and a second type of user, wherein the channel quality of the base station to the first type of user is higher than the second type.
  • the channel quality of the class user determines the scheduling type of each subframe in the scheduling period. For the subframe used for uplink transmission, the user is scheduled to be uplinked from the uplink user; for the subframe used for downlink transmission, the downlink user is scheduled. The user performs downlink transmission; for the subframe used for full-duplex transmission, the user is scheduled to perform downlink transmission from the first type of users, or the user is scheduled to perform uplink transmission from the second type of users.
  • the invention can realize the same-frequency full-duplex transmission in the TDD system by improving the existing user scheduling mechanism, thereby improving the communication efficiency of the TDD system, and the invention reduces the interference between the scheduled users, thereby reducing the pair.
  • Base station interference cancellation capability requirements are provided.
  • Figure 1 is a schematic diagram of a co-frequency full-duplex transmission
  • FIG. 2 is a schematic flowchart of a user scheduling method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a frame adopting LTE subframe configuration 1 according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a user scheduling system according to an embodiment of the present invention.
  • the basic idea of the present invention is: dividing the users to be scheduled into two categories: a first type of users and a second type of users, wherein the channel quality of the base station to the first type of users is higher than that of the second type of users.
  • the quality is determined by the scheduling type of each subframe in the scheduling period.
  • the user For the subframe used for uplink transmission, the user is scheduled to perform uplink transmission from the uplink user.
  • For the subframe used for downlink transmission the user is scheduled to perform downlink transmission from the downlink user.
  • For a subframe used for full-duplex transmission the user is scheduled to perform downlink transmission from the first type of users, or the user is scheduled to perform uplink transmission from the second type of users.
  • An embodiment of the present invention provides a user scheduling method. As shown in FIG. 2, the method includes: Step 201: Divide a user to be scheduled into two types: a first type user and a second type user, where the base station reaches the The channel quality of the first type of users is higher than the channel quality of the second type of users.
  • the system generally sets the same-frequency full-duplex transmission period by default, and the scheduling period includes N subframes.
  • N l, 2, 3 .
  • users are divided into two categories: first-class users and second-class users. Among them, the channel quality of the base station to the first type of users is good, and the channel quality of the base station to the second type of users is poor.
  • the user to be scheduled is classified into a first type of user; if the RSRQ of the user to be scheduled is not greater than a preset
  • the threshold is used to divide the to-be-scheduled user into a second type of user.
  • all users to be scheduled will send SRS signals to the base station, and the base station can perform RSRQ measurement according to the received SRS signals.
  • Step 202 Determine a scheduling type of each subframe in the scheduling period, and schedule a user to perform uplink transmission from the uplink user for the subframe used for uplink transmission, and schedule the user to downlink from the downlink user for the subframe used for downlink transmission.
  • the user is scheduled to perform downlink transmission from the first type of users, or the user is scheduled to perform uplink transmission from the second type of users.
  • a full-duplex sub-frame only the first type of users are scheduled in the downlink, and only the second type of users are scheduled in the uplink.
  • whether the subframe is used for full-duplex transmission is determined according to the traffic volume and whether the full-duplex transmission condition is met.
  • the scheduling type of each subframe in the determining the scheduling period is:
  • the downlink user currently scheduled by the downlink subframe is the first type of user, or the uplink user of the current uplink subframe is the second type of user, it is determined that the subframe is available for full duplex transmission;
  • the frame is used for downlink transmission, and the uplink subframe is used for uplink transmission.
  • FIG. 3 is a schematic diagram of a frame structure using LTE subframe configuration 1. As shown in FIG. 3, subframe 0 and subframe 5 are downlink subframes, subframe 2, subframe 3, subframe 4, and subframe 7, Subframe 8 and subframe 9 are uplink subframes.
  • subframe 0 is not used for full duplex transmission; if the downlink user scheduled by subframe 5 is the first For the class user, the subframe 5 can be used for full-duplex transmission; if the uplink user scheduled by the subframe 2 is the first-type user, the subframe 2 is not used for full-duplex transmission; if the uplink user scheduled for the subframe 3 is the second For class users, subframe 3 can be used for full duplex transmission.
  • the user is scheduled to perform downlink transmission from the first type of user, or the user is scheduled to perform uplink transmission from the second type of user:
  • the user For the uplink subframe used for full-duplex transmission, the user is scheduled to perform downlink transmission from the first type of users; for the downlink subframe used for full-duplex transmission, the user is scheduled to perform uplink transmission from the second type of users.
  • the method further includes: determining, for the scheduled user, a minimum transmit power according to a Quality of Service (QoS) parameter.
  • QoS Quality of Service
  • the QoS threshold is defined. If the QoS is greater than the threshold, the transmit power can be appropriately reduced, and only the QoS requirement needs to be met.
  • the scheduling user performs uplink transmission or downlink transmission as:
  • Scheduling according to the proportional fairness criterion, the maximum throughput criterion, or the channel quality indicator (CQI) index maximum criterion For example, according to the maximum criterion of the CQI index, the UE obtains the index value of the CQI according to the correspondence between the calculated signal to interference and noise ratio according to the CQI. The larger the CQI index value, the better the signal quality.
  • CQI channel quality indicator
  • the base station schedules an uplink user according to a proportional fair rule or a maximum throughput or a CQI index maximum criterion; If the subframe is used for downlink transmission, the base station schedules a downlink user according to a proportional fairness rule or a maximum throughput or a CQI index maximum criterion;
  • the base station If the subframe is used for full-duplex transmission, the base station according to the proportional fairness rule or the maximum throughput or
  • the CQI index is the largest criterion for scheduling paired uplink users and downstream users.
  • the embodiment of the present invention further provides a user scheduling system.
  • the system includes: a classification module 41, a scheduling type determining module 42 and a scheduling module 43;
  • the classification module 41 is configured to divide the users to be scheduled into two types: a first type of users and a second type of users, wherein a channel quality of the base station to the first type of users is higher than a channel quality of the second type of users.
  • the scheduling type determining module 42 is configured to determine a scheduling type of each subframe in the scheduling period, and the scheduling module 43 is configured to: according to the result determined by the scheduling type determining module 42, schedule the uplink user from the subframe used for uplink transmission.
  • the user performs uplink transmission; for the subframe used for downlink transmission, the user is scheduled to perform downlink transmission from the downlink user; for the subframe used for full-duplex transmission, the user is scheduled to perform downlink transmission from the first type of user, or In the second type of users, the user is scheduled to perform uplink transmission.
  • the classification module 41 is configured to: when the RSRQ of the to-be-scheduled user is greater than a preset threshold, the user to be scheduled is divided into a first-type user; when the RSRQ of the user to be scheduled is not greater than a preset threshold, The user to be scheduled is divided into a second type of user.
  • the scheduling type determining module 42 is configured to determine, when the downlink user currently scheduled in the downlink subframe is the first type of user, or when the uplink user currently scheduled in the uplink subframe is the second type of user, determining the subframe. Can be used for full-duplex transmission; then, according to the traffic demand, select some or all of the subframes from the subframes available for full-duplex transmission for full-duplex transmission, and determine the scheduling period except for full-duplex The downlink subframes other than the transmitted subframe are used for downlink transmission, and the uplink subframe is used for uplink transmission.
  • the scheduling module 43 is specifically configured to: schedule, for the uplink subframe for the full-duplex transmission, the user to perform downlink transmission from the first type of users; and the downlink subframe for full-duplex transmission, from the second The class user schedules the user for uplink transmission.
  • the scheduling module 43 is further configured to determine, according to the service quality of service QoS parameter, a minimum transmit power to the scheduled user.
  • the scheduling module 43 is specifically configured to perform scheduling according to a proportional fairness criterion, a maximum throughput criterion, or a channel quality indication CQI index maximum criterion.
  • the present invention can reduce the interference strength of the uplink user's signal to the downlink user's received signal and ensure the normal operation of the full-duplex transmission by scheduling only the first type of users on the downlink and the second type of users on the uplink.
  • the interference strength of the signal transmitted by the base station to the received signal can be reduced, thereby reducing the requirement for the interference cancellation capability of the base station, and expanding the system with limited interference cancellation capability at the base station end.
  • the scope of application is specifically configured to perform scheduling according to a proportional fairness criterion, a maximum throughput criterion, or a channel quality indication CQI index maximum criterion.
  • the above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.
  • the device embodiment since it basically corresponds to the method embodiment, reference may be made to the partial description of the method embodiment.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, ie may be located One place, or it can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

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

本发明公开了一种用户调度方法,包括:将待调度用户划分为两类,其中,基站到所述第一类用户的信道质量高于到所述第二类用户的信道质量,确定调度周期内各个子帧的调度类型,对于用于上行传输的子帧,从上行用户中调度用户进行上行传输;对于用于下行传输的子帧,从下行用户中调度用户进行下行传输;对于用于全双工传输的子帧,从第一类用户中调度用户进行下行传输,或者,从第二类用户中调度用户进行上行传输。本发明还相应地公开了一种用户调度系统。本发明通过改进现有用户调度机制,在TDD系统中实现同频全双工传输,从而能够提高TDD系统的通信效率,并且,本发明对基站干扰消除能力的要求较低。

Description

一种用户调度方法及系统
本申请要求于 2013年 2月 1日提交中国专利局、 申请号为 201310044703.X、 发明名称为"一种用户调度方法及系统"的中国专利申请的优先权,其全部内容 通过引用结合在本申请中。
技术领域
本发明涉及无线通信技术, 具体涉及一种用户调度方法及系统。
背景技术
时分同步码分多址 ( Time Division-Synchronous Code Division Multiple Access , TD-SCDMA )通信系统和分时长期演进(Time Division Long Term Evolution, TD-LTE )通信系统采用了时分双工( Time Division Duplexing, TDD ) 方式, 并将一个无线帧划分为 10个子帧, 用作下行子帧或上行子帧, 通过配置 不同的下行子帧数与上行子帧数来匹配不对称的上下行业务。
随着移动互联网业务量飞速增长, TDD系统的容量和覆盖问题(尤其是热 点和室内 )日益突出, 不但需要设计更灵活的上下行子帧配置机制以匹配业务 上下行动态特性, 而且需要进一步提高 TDD系统的频谱效率以增强网络容量。 基于上述需求,在新一代通信系统设计中引入了低功率的高密度小区(如大量 的微微基站 )来提升频率复用率, 而基于低功率基站的同频全双工传输技术则 得到越来越深度的关注。
所谓同频全双工,主要思路^^站在相同频段和子帧中同时发送下行数据 和接收上行数据,从而理论上可以成倍提升频谱效率。 同频全双工需要在基站 端分别配置接收天线和发射天线,基站在接收上行信号时需要对发送信号造成 的干扰进行消除。 目前已实现了 73dB的干扰消除, 若采用方向性天线, 甚至 可以消除 113dB干扰, 从而, 已具备在低功率基站应用场景中实现同频全双工 传输的条件。
由于干扰消除对硬件要求较高, 因此同频全双工传输一般不在用户端操 作, 而是采用图 1所示的方案实现, 图 1中, 基站同时收发两个不同用户端的数 据, 以提高整个系统的传输效率, 具体的, 基站在同一个子帧中发送数据给 UE1 , 在同样的子帧中接收 UE2发送的数据。 但是, 将图 1所示的同频全双工传输方案应用到现有系统中会面临如下问 题:
1、 与基站同频全双工传输的两个用户, 一个发送上行信号, 另一个接收 下行信号, 这样上行信号会对另一个用户接收的下行信号造成干扰, 而现有的 多用户调度机制无法估计两个用户之间的干扰情况,导致该干扰不能避免或消 除, 从而会造成另一个用户接收下行数据失败, 无法实现同频全双工传输, 影 响 TDD系统的通信效率;
2、 在同频全双工系统中, 基站在接收上行用户的同时, 向下行用户发送 数据, 这样下行发送信号会对上行接收信号造成干扰,从而提高对基站干扰消 除能力的要求。
发明内容
有鉴于此, 本发明的主要目的在于提供一种用户调度方法及系统, 能够提 高 TDD系统的通信效率, 且对基站干扰消除能力的要求较低。
为达到上述目的, 本发明的技术方案是这样实现的:
一种用户调度方法,将待调度用户划分为两类:第一类用户和第二类用户, 其中, 基站到所述第一类用户的信道质量高于到所述第二类用户的信道质量, 该方法包括:
确定调度周期内各个子帧的调度类型, 对于用于上行传输的子帧,从上行 用户中调度用户进行上行传输; 对于用于下行传输的子帧,从下行用户中调度 用户进行下行传输; 对于用于全双工传输的子帧,从第一类用户中调度用户进 行下行传输, 或者, 从第二类用户中调度用户进行上行传输。
所述将待调度用户划分为两类包括:
如果待调度用户的参考信号接收质量 RSRQ大于预设阈值, 则将所述待调 度用户划分为第一类用户; 如果待调度用户的 RSRQ不大于预设阈值, 则将所 述待调度用户划分为第二类用户。
所述确定调度周期内各个子帧的调度类型为:
如果下行子帧当前调度的下行用户为第一类用户, 或者, 上行子帧当前调 度的上行用户为第二类用户, 则确定所述子帧可用于全双工传输; 根据业务量需求,从所述可用于全双工传输的子帧中选择部分或全部子帧 用于全双工传输,确定调度周期内除用于全双工传输的子帧之外的下行子帧用 于下行传输, 上行子帧用于上行传输。
所述对于用于全双工传输的子帧, 从第一类用户中调度用户进行下行传 输, 或者, 从第二类用户中调度用户进行上行传输为:
对于用于全双工传输的上行子帧, 从第一类用户中调度用户进行下行传 输;对于用于全双工传输的下行子帧,从第二类用户中调度用户进行上行传输。
该方法还包括: 对于被调度的用户, 根据业务服务质量 QoS参数, 确定最 小发送功率。
所述调度用户进行上行传输或下行传输为:
根据比例公平准则、 最大吞吐量准则或信道质量指示 CQI索引最大准则进 行调度。
一种用户调度系统, 包括: 分类模块、 调度类型确定模块和调度模块; 其 中,
所述分类模块,用于将待调度用户划分为两类:第一类用户和第二类用户, 其中, 基站到所述第一类用户的信道质量高于到所述第二类用户的信道质量; 所述调度类型确定模块, 用于确定调度周期内各个子帧的调度类型; 所述调度模块, 用于根据调度类型确定模块确定的结果,对于用于上行传 输的子帧, 从上行用户中调度用户进行上行传输; 对于用于下行传输的子帧, 从下行用户中调度用户进行下行传输; 对于用于全双工传输的子帧,从第一类 用户中调度用户进行下行传输,或者,从第二类用户中调度用户进行上行传输。
所述分类模块, 具体用于在待调度用户的 RSRQ大于预设阈值时, 将所述 待调度用户划分为第一类用户; 在待调度用户的 RSRQ不大于预设阈值时, 将 所述待调度用户划分为第二类用户。
所述调度类型确定模块,具体用于在下行子帧当前调度的下行用户为第一 类用户, 或者, 上行子帧当前调度的上行用户为第二类用户时, 确定所述子帧 可用于全双工传输; 之后, 根据业务量需求, 从所述可用于全双工传输的子帧 中选择部分或全部子帧用于全双工传输,确定调度周期内除用于全双工传输的 子帧之外的下行子帧用于下行传输, 上行子帧用于上行传输。 所述调度模块, 具体用于对用于全双工传输的上行子帧,从第一类用户中 调度用户进行下行传输; 对用于全双工传输的下行子帧,从第二类用户中调度 用户进行上行传输。
所述调度模块, 还用于根据业务服务质量 QoS参数, 确定对被调度用户的 最小发送功率。
所述调度模块, 具体用于根据比例公平准则、最大吞吐量准则或信道质量 指示 CQI索引最大准则进行调度。
本发明所述的用户调度方法及系统,将待调度用户划分为两类: 第一类用 户和第二类用户, 其中,基站到所述第一类用户的信道质量高于到所述第二类 用户的信道质量,确定调度周期内各个子帧的调度类型,对于用于上行传输的 子帧, 从上行用户中调度用户进行上行传输; 对于用于下行传输的子帧, 从下 行用户中调度用户进行下行传输; 对于用于全双工传输的子帧,从第一类用户 中调度用户进行下行传输, 或者, 从第二类用户中调度用户进行上行传输。 本 发明通过改进现有用户调度机制, 能够在 TDD系统中实现同频全双工传输,从 而能够提高 TDD系统的通信效率,并且,本发明降低了被调度用户之间的干扰, 从而降低了对基站干扰消除能力的要求。
附图说明
为了更清楚地说明本申请实施例中的技术方案,下面将对实施例描述中所 需要使用的附图作筒单地介绍,显而易见地, 下面描述中的附图仅仅是本申请 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性的前提 下, 还可以根据这些附图获得其他的附图。
图 1为一同频全双工传输示意图;
图 2为本发明实施例一种用户调度方法流程示意图;
图 3为本发明实施例采用 LTE子帧配置 1的帧结构示意图;
图 4为本发明实施例一种用户调度系统结构示意图。
具体实施方式
下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本申请一部分实施例, 而不是 全部的实施例。基于本申请中的实施例, 本领域普通技术人员在没有做出创造 性劳动前提下所获得的所有其他实施例, 都属于本申请保护的范围。
本发明的基本思想是: 将待调度用户划分为两类: 第一类用户和第二类用 户, 其中,基站到所述第一类用户的信道质量高于到所述第二类用户的信道质 量, 确定调度周期内各个子帧的调度类型, 对于用于上行传输的子帧, 从上行 用户中调度用户进行上行传输; 对于用于下行传输的子帧,从下行用户中调度 用户进行下行传输; 对于用于全双工传输的子帧,从第一类用户中调度用户进 行下行传输, 或者, 从第二类用户中调度用户进行上行传输。
本发明实施例提出了一种用户调度方法, 如图 2所示, 该方法包括: 步骤 201: 将待调度用户划分为两类: 第一类用户和第二类用户, 其中, 基站到所述第一类用户的信道质量高于到所述第二类用户的信道质量。
这里, 系统一般默认设置同频全双工传输周期,该调度周期包含 N个子帧,
N=l、 2、 3 。 在调度周期内, 将用户分为两类: 第一类用户和第二类用 户。 其中, 基站到第一类用户的信道质量较好, 基站到第二类用户的信道质量 较差。
可选的, 如果待调度用户的参考信号接收质量( Reference Signal Received Quality, RSRQ ) 大于预设阈值, 则将所述待调度用户划分为第一类用户; 如 果待调度用户的 RSRQ不大于预设阈值, 则将所述待调度用户划分为第二类用 户。 在现有应用中, 所有待调度的用户会向基站发送 SRS信号, 基站根据接收 到的 SRS信号, 便可进行 RSRQ测量。
步骤 202: 确定调度周期内各个子帧的调度类型, 对于用于上行传输的子 帧, 从上行用户中调度用户进行上行传输; 对于用于下行传输的子帧, 从下行 用户中调度用户进行下行传输; 对于用于全双工传输的子帧,从第一类用户中 调度用户进行下行传输, 或者, 从第二类用户中调度用户进行上行传输。
例如, 从 N个子帧中选择 K个子帧用于全双工传输, 其余 N-K个子帧中, T 个子帧仅用于上行传输, L个子帧仅用于下行传输, 即满足 T+L=N-K。
需要说明的是, 在全双工子帧中, 下行仅调度第一类用户, 上行仅调度第 二类用户。 基于现有的 TD-LTE帧结构, 根据业务量及是否满足全双工传输条件, 决 定此子帧是否用于全双工传输。可选的, 所述确定调度周期内各个子帧的调度 类型为:
如果下行子帧当前调度的下行用户为第一类用户, 或者, 上行子帧当前调 度的上行用户为第二类用户, 则确定所述子帧可用于全双工传输;
根据业务量需求,从所述可用于全双工传输的子帧中选择部分或全部子帧 用于全双工传输,确定调度周期内除用于全双工传输的子帧之外的下行子帧用 于下行传输, 上行子帧用于上行传输。
图 3所示为采用 LTE子帧配置 1的帧结构示意图, 如图 3所示, 子帧 0、 子 帧 5为下行子帧, 子帧 2、 子帧 3、 子帧 4、 子帧 7、 子帧 8、 子帧 9为上行子帧, 那么, 如果子帧 0调度的下行用户为第二类用户, 则子帧 0不用于全双工传输; 如果子帧 5调度的下行用户为第一类用户, 则子帧 5可用于全双工传输; 如果子 帧 2调度的上行用户为第一类用户, 则子帧 2不用于全双工传输; 如果子帧 3调 度的上行用户为第二类用户, 则子帧 3可用于全双工传输。
可选的, 所述对于用于全双工传输的子帧,从第一类用户中调度用户进行 下行传输, 或者, 从第二类用户中调度用户进行上行传输为:
对于用于全双工传输的上行子帧, 从第一类用户中调度用户进行下行传 输;对于用于全双工传输的下行子帧,从第二类用户中调度用户进行上行传输。
可选的, 该方法还包括: 对于被调度的用户, 根据业务服务质量( Quality of Service, QoS )参数, 确定最小发送功率。 具体的, 定义 QoS阙值, 若被调 度的用户, 其 QoS大于阙值, 则可适当降低发送功率, 仅需满足 QoS需求即可。
可选的, 所述调度用户进行上行传输或下行传输为:
根据比例公平准则、 最大吞吐量准则或信道质量指示 (Channel Quality Indicator , CQI ) 索引最大准则进行调度。 比如根据 CQI索引最大准则, 即为 UE通过测量, 将计算的信干噪比按照与 CQI的对应关系, 获得 CQI的索引值。 CQI索引值越大, 说明其信号质量越好。
具体的:
若子帧用于上行传输, 则基站根据比例公平法则或者最大吞吐量或者 CQI 索引最大的准则, 调度一个上行用户; 若子帧用于下行传输, 则基站根据比例公平法则或者最大吞吐量或者 CQI 索引最大的准则, 调度一个下行用户;
若子帧用于全双工传输, 则基站根据比例公平法则或者最大吞吐量或者
CQI索引最大的准则, 调度配对的上行用户及下行用户。
本发明实施例还相应地提出了一种用户调度系统, 如图 4所示, 该系统包 括: 分类模块 41、 调度类型确定模块 42和调度模块 43; 其中,
分类模块 41 , 用于将待调度用户划分为两类: 第一类用户和第二类用户, 其中, 基站到所述第一类用户的信道质量高于到所述第二类用户的信道质量; 调度类型确定模块 42 , 用于确定调度周期内各个子帧的调度类型; 调度模块 43, 用于根据调度类型确定模块 42确定的结果,对于用于上行传 输的子帧, 从上行用户中调度用户进行上行传输; 对于用于下行传输的子帧, 从下行用户中调度用户进行下行传输; 对于用于全双工传输的子帧,从第一类 用户中调度用户进行下行传输,或者,从第二类用户中调度用户进行上行传输。
可选的, 分类模块 41 , 具体用于在待调度用户的 RSRQ大于预设阈值时, 将所述待调度用户划分为第一类用户; 在待调度用户的 RSRQ不大于预设阈值 时, 将所述待调度用户划分为第二类用户。
可选的,调度类型确定模块 42, 具体用于在下行子帧当前调度的下行用户 为第一类用户, 或者, 上行子帧当前调度的上行用户为第二类用户时, 确定所 述子帧可用于全双工传输; 之后, 根据业务量需求, 从所述可用于全双工传输 的子帧中选择部分或全部子帧用于全双工传输,确定调度周期内除用于全双工 传输的子帧之外的下行子帧用于下行传输, 上行子帧用于上行传输。
可选的, 调度模块 43, 具体用于对用于全双工传输的上行子帧, 从第一类 用户中调度用户进行下行传输; 对用于全双工传输的下行子帧,从第二类用户 中调度用户进行上行传输。
可选的, 调度模块 43 , 还用于根据业务服务质量 QoS参数, 确定对被调度 用户的最小发送功率。
可选的, 调度模块 43, 具体用于根据比例公平准则、 最大吞吐量准则或信 道质量指示 CQI索引最大准则进行调度。 本发明通过在全双工子帧下行仅调度第一类用户以及上行仅调度第二类 用户, 能够降低上行用户的信号对下行用户接收信号的干扰强度,保证全双工 传输的正常运行; 并且, 通过在全双工子帧下行仅调度第一类用户, 能够降低 基站端发送信号对接收信号的干扰强度,从而降低了对基站干扰消除能力的要 求, 扩大了基站端干扰消除能力有限的系统的应用范围。
以上所述,仅为本发明的较佳实施例而已, 并非用于限定本发明的保护范 围。 对于装置实施例而言, 由于其基本对应于方法实施例, 所以相关之处参见 方法实施例的部分说明即可。 以上所描述的装置实施例仅仅是示意性的, 其中 所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元 显示的部件可以是或者也可以不是物理单元, 即可以位于一个地方, 或者也可 以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块 来实现本实施例方案的目的。本领域普通技术人员在不付出创造性劳动的情况 下, 即可以理解并实施。
需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将 一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些 实体或操作之间存在任何这种实际的关系或者顺序。 而且,术语"包括"、 "包 含"或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素 的过程、 方法、 物品或者设备不仅包括那些要素, 而且还包括没有明确列出的 其他要素, 或者是还包括为这种过程、 方法、 物品或者设备所固有的要素。 在 没有更多限制的情况下, 由语句 "包括一个…… " 限定的要素, 并不排除在包 括所述要素的过程、 方法、 物品或者设备中还存在另外的相同要素。 以上对本发明实施例所提供的用户调度方法及系统进行了详细介绍,本文 只是用于帮助理解本发明的方法及其核心思想; 同时,对于本领域的一般技术 人员, 依据本发明的思想, 在具体实施方式及应用范围上均会有改变之处, 综 上所述, 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种用户调度方法, 其特征在于, 将待调度用户划分为两类: 第一类 用户和第二类用户, 其中,基站到所述第一类用户的信道质量高于到所述第二 类用户的信道质量, 该方法包括:
确定调度周期内各个子帧的调度类型, 对于用于上行传输的子帧,从上行 用户中调度用户进行上行传输; 对于用于下行传输的子帧,从下行用户中调度 用户进行下行传输; 对于用于全双工传输的子帧,从第一类用户中调度用户进 行下行传输, 或者, 从第二类用户中调度用户进行上行传输。
2、根据权利要求 1所述的方法, 其特征在于, 所述将待调度用户划分为两 类包括:
如果待调度用户的参考信号接收质量 RSRQ大于预设阈值, 则将所述待调 度用户划分为第一类用户; 如果待调度用户的 RSRQ不大于预设阈值, 则将所 述待调度用户划分为第二类用户。
3、根据权利要求 1所述的方法, 其特征在于, 所述确定调度周期内各个子 帧的调度类型为:
如果下行子帧当前调度的下行用户为第一类用户, 或者, 上行子帧当前调 度的上行用户为第二类用户, 则确定所述子帧可用于全双工传输;
根据业务量需求,从所述可用于全双工传输的子帧中选择部分或全部子帧 用于全双工传输,确定调度周期内除用于全双工传输的子帧之外的下行子帧用 于下行传输, 上行子帧用于上行传输。
4、 根据权利要求 3所述的方法, 其特征在于, 所述对于用于全双工传输的 子帧, 从第一类用户中调度用户进行下行传输, 或者, 从第二类用户中调度用 户进行上行传输为:
对于用于全双工传输的上行子帧, 从第一类用户中调度用户进行下行传 输;对于用于全双工传输的下行子帧,从第二类用户中调度用户进行上行传输。
5、 根据权利要求 1至 4任一项所述的方法, 其特征在于, 该方法还包括: 对于被调度的用户, 根据业务服务质量 QoS参数, 确定最小发送功率。
6、 根据权利要求 1至 4任一项所述的方法, 其特征在于, 所述调度用户进 行上行传输或下行传输为: 根据比例公平准则、 最大吞吐量准则或信道质量指示 CQI索引最大准则进 行调度。
7、 一种用户调度系统, 其特征在于, 该系统包括: 分类模块、 调度类型 确定模块和调度模块; 其中,
所述分类模块,用于将待调度用户划分为两类:第一类用户和第二类用户, 其中, 基站到所述第一类用户的信道质量高于到所述第二类用户的信道质量; 所述调度类型确定模块, 用于确定调度周期内各个子帧的调度类型; 所述调度模块, 用于根据调度类型确定模块确定的结果,对于用于上行传 输的子帧, 从上行用户中调度用户进行上行传输; 对于用于下行传输的子帧, 从下行用户中调度用户进行下行传输; 对于用于全双工传输的子帧,从第一类 用户中调度用户进行下行传输,或者,从第二类用户中调度用户进行上行传输。
8、 根据权利要求 7所述的系统, 其特征在于,
所述分类模块, 具体用于在待调度用户的 RSRQ大于预设阈值时, 将所述 待调度用户划分为第一类用户; 在待调度用户的 RSRQ不大于预设阈值时, 将 所述待调度用户划分为第二类用户。
9、 根据权利要求 7所述的系统, 其特征在于,
所述调度类型确定模块,具体用于在下行子帧当前调度的下行用户为第一 类用户, 或者, 上行子帧当前调度的上行用户为第二类用户时, 确定所述子帧 可用于全双工传输; 之后, 根据业务量需求, 从所述可用于全双工传输的子帧 中选择部分或全部子帧用于全双工传输,确定调度周期内除用于全双工传输的 子帧之外的下行子帧用于下行传输, 上行子帧用于上行传输。
10、 根据权利要求 9所述的系统, 其特征在于,
所述调度模块, 具体用于对用于全双工传输的上行子帧,从第一类用户中 调度用户进行下行传输; 对用于全双工传输的下行子帧,从第二类用户中调度 用户进行上行传输。
11、 根据权利要求 7至 10任一项所述的系统, 其特征在于,
所述调度模块, 还用于根据业务服务质量 QoS参数, 确定对被调度用户的 最小发送功率。
12、 根据权利要求 7至 10任一项所述的系统, 其特征在于, 所述调度模块, 具体用于根据比例公平准则、最大吞吐量准则或信道质量 指示 CQI索引最大准则进行调度。
PCT/CN2014/071677 2013-02-01 2014-01-28 一种用户调度方法及系统 Ceased WO2014117730A1 (zh)

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