CN113613180B - A throughput requirement-oriented component carrier selection method for LTE-U system - Google Patents

A throughput requirement-oriented component carrier selection method for LTE-U system Download PDF

Info

Publication number
CN113613180B
CN113613180B CN202110894202.5A CN202110894202A CN113613180B CN 113613180 B CN113613180 B CN 113613180B CN 202110894202 A CN202110894202 A CN 202110894202A CN 113613180 B CN113613180 B CN 113613180B
Authority
CN
China
Prior art keywords
lte
user
carrier
users
wifi
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110894202.5A
Other languages
Chinese (zh)
Other versions
CN113613180A (en
Inventor
郑军
唐佳欣
肖杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Southeast University
Original Assignee
Southeast University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Southeast University filed Critical Southeast University
Priority to CN202110894202.5A priority Critical patent/CN113613180B/en
Publication of CN113613180A publication Critical patent/CN113613180A/en
Application granted granted Critical
Publication of CN113613180B publication Critical patent/CN113613180B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

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

Abstract

本发明公开了一种面向吞吐量需求的LTE‑U系统成分载波选择方法，包括如下步骤：(1)在CSAT周期开始时，初始化下一CSAT周期开始时共存网络用户数；(2)在CSAT周期内，根据共存网络中用户的动态到达或离去，更新各载波上的用户信息；(3)在CSAT周期结束前，为该周期内到达的LTE‑U新用户选择合适的载波。本发明在保障LTE‑U和WiFi共存公平性以及网络中现有LTE‑U用户吞吐量需求的基础上，根据LTE‑U新用户的吞吐量需求，为LTE‑U新用户选择一个或者多个合适的载波，有效地提升了共存网络的LTE‑U用户满意度。

Figure 202110894202

The invention discloses a method for selecting a component carrier of an LTE-U system oriented to throughput requirements, comprising the following steps: (1) at the beginning of a CSAT cycle, initialize the number of coexisting network users at the beginning of the next CSAT cycle; (2) at the beginning of the CSAT cycle During the period, according to the dynamic arrival or departure of users in the coexisting network, update the user information on each carrier; (3) Before the end of the CSAT period, select the appropriate carrier for the new LTE-U users arriving in the period. The present invention selects one or more LTE-U new users according to the throughput requirements of LTE-U new users on the basis of guaranteeing the coexistence fairness of LTE-U and WiFi and the throughput requirements of existing LTE-U users in the network. A suitable carrier can effectively improve the LTE‑U user satisfaction in coexisting networks.

Figure 202110894202

Description

一种面向吞吐量需求的LTE-U系统成分载波选择方法A throughput requirement-oriented component carrier selection method for LTE-U system

技术领域technical field

本发明涉及移动通信中LTE-U系统与WiFi系统非授权频段共存技术领域，具体涉及一种面向吞吐量需求的LTE-U系统成分载波选择方法。The invention relates to the technical field of unlicensed frequency band coexistence between an LTE-U system and a WiFi system in mobile communications, and in particular to a method for selecting a component carrier of an LTE-U system oriented to throughput requirements.

背景技术Background technique

随着蜂窝网络业务的多样化，LTE-U系统需要具备支持不同的业务和用户特定吞吐量需求的能力。例如，一些IOT设备需要低功耗传输以延长电池寿命，而对吞吐量需求很低，而AR/VR以及高清在线直播等业务则对吞吐量有很高的需求。由于5G应用场景的多样化，考虑到实际场景中用户吞吐量需求的差异性和非授权频段上信道质量的不稳定性，LTE-U基站不限于在单个频带内调度时频资源，而是通过采用载波聚合(Carrieraggregation,CA)技术，使用户可以同时使用非授权频段的多个正交成分载波，以满足用户对吞吐量的特定需求。3GPP在R10中提出了载波聚合技术，通过聚合多个连续或不连续的成分载波来获得更大的带宽，为用户提供更高的数据速率，以满足用户高吞吐量业务的需求。With the diversification of cellular network services, the LTE-U system needs to have the ability to support different services and user-specific throughput requirements. For example, some IOT devices require low-power transmission to extend battery life, but have low throughput requirements, while services such as AR/VR and high-definition online live broadcasts have high throughput requirements. Due to the diversification of 5G application scenarios, considering the differences in user throughput requirements in actual scenarios and the instability of channel quality in unlicensed frequency bands, LTE-U base stations are not limited to scheduling time-frequency resources in a single frequency band, but through Carrier aggregation (CA) technology is adopted to enable users to use multiple orthogonal component carriers of unlicensed frequency bands at the same time to meet users' specific requirements for throughput. 3GPP proposed carrier aggregation technology in R10, which can obtain larger bandwidth by aggregating multiple continuous or discontinuous component carriers, and provide users with higher data rates to meet the needs of users for high-throughput services.

实现载波聚合需要有效的成分载波选择方法，为用户选择和分配合适的载波(单个或者多个)，以满足用户的吞吐量需求。载波选择时需要综合考虑用户的吞吐量需求信息、终端的载波聚合能力以及信道的状态信息，如每个成分载波上的负荷状况、信道质量等。传统LTE/LTE-A系统的成分载波选择方法主要分为两大类：一类基于负载均衡，另一类基于信道质量。非授权频段的载波选择问题不同于传统LTE系统的载波选择问题，因为除了考虑负载均衡和信道质量等因素之外，还需要考虑LTE-U系统和WiFi系统共存公平性、WiFi用户到达的随机性等因素。因此，LTE/LTE-A系统中所采用的成分载波选择方法不能直接应用于LTE-U系统，需要研究和设计适用于LTE-U和WiFi共存网络的有效成分载波选择方法。Implementing carrier aggregation requires an effective component carrier selection method to select and allocate suitable carriers (single or multiple) for users to meet the user's throughput requirements. When selecting a carrier, it is necessary to comprehensively consider the throughput requirement information of the user, the carrier aggregation capability of the terminal, and the state information of the channel, such as the load status and channel quality on each component carrier. The component carrier selection methods of traditional LTE/LTE-A systems are mainly divided into two categories: one is based on load balancing, and the other is based on channel quality. The carrier selection problem of unlicensed frequency bands is different from the carrier selection problem of traditional LTE systems, because in addition to factors such as load balancing and channel quality, it is also necessary to consider the coexistence fairness of the LTE-U system and the WiFi system, and the randomness of the arrival of WiFi users. And other factors. Therefore, the component carrier selection method adopted in the LTE/LTE-A system cannot be directly applied to the LTE-U system, and an effective component carrier selection method suitable for LTE-U and WiFi coexistence networks needs to be studied and designed.

发明内容SUMMARY OF THE INVENTION

本发明的目的是为解决上述问题提供一种面向吞吐量需求的LTE-U系统成分载波选择(Component Carrier Selection，CCS)方法。该方法在保障LTE-U和WiFi共存公平性以及网络中现有LTE-U用户吞吐量需求的基础上，根据LTE-U新用户的吞吐量需求为其选择一个或者多个合适的载波，有效地提升了共存网络的LTE-U用户满意度。The purpose of the present invention is to provide a throughput requirement-oriented LTE-U system component carrier selection (Component Carrier Selection, CCS) method to solve the above problems. The method selects one or more suitable carriers for new LTE-U users according to the throughput requirements of new LTE-U users on the basis of guaranteeing the coexistence fairness of LTE-U and WiFi and the throughput requirements of existing LTE-U users in the network. This greatly improves the LTE-U user satisfaction of the coexisting network.

为实现上述目标，本发明采用的方法是一种面向吞吐量需求的LTE-U系统成分载波选择方法，该方法的主要步骤如下：In order to achieve the above goals, the method adopted in the present invention is a method for selecting a component carrier of an LTE-U system oriented to throughput requirements, and the main steps of the method are as follows:

(1)初始化下一CSAT周期开始时共存网络用户数：假设第t个CSAT周期开始时共存网络中第i个载波上需要服务的WiFi用户和LTE-U用户数分别为

Figure BDA0003197189920000021
和
Figure BDA0003197189920000022
由于在该周期内共存网络中会有WiFi用户和LTE-U用户动态地到达或离去，第t+1个CSAT周期开始时第i个载波上的用户数
Figure BDA0003197189920000023
和
Figure BDA0003197189920000024
分别会有相应的增加或减少。为了确定
Figure BDA0003197189920000025
和
Figure BDA0003197189920000026
首先设置
Figure BDA0003197189920000027
然后随着用户的到达或离去，对
Figure BDA0003197189920000028
和
Figure BDA0003197189920000029
进行增减；(1) Initialize the number of coexisting network users at the beginning of the next CSAT cycle: Assume that the number of WiFi users and LTE-U users that need to be served on the i-th carrier in the co-existing network at the beginning of the t-th CSAT cycle are respectively
Figure BDA0003197189920000021
and
Figure BDA0003197189920000022
Since there will be WiFi users and LTE-U users dynamically arriving or leaving in the coexisting network during this period, the number of users on the i-th carrier at the beginning of the t+1-th CSAT period
Figure BDA0003197189920000023
and
Figure BDA0003197189920000024
There will be a corresponding increase or decrease, respectively. to confirm
Figure BDA0003197189920000025
and
Figure BDA0003197189920000026
first set
Figure BDA0003197189920000027
Then as the user arrives or leaves, right
Figure BDA0003197189920000028
and
Figure BDA0003197189920000029
increase or decrease;

(2)在第t个CSAT周期内，根据共存网络中用户的动态到达或离去，更新各载波上需要服务的用户数：若有一个用户(WiFi用户或LTE-U用户)完成传输后离开共存网络，则将该用户移出其所使用载波上的相应用户组，并对

Figure BDA00031971899200000210
或
Figure BDA00031971899200000211
进行减一操作；若有一个新用户到达共存网络，首先判断新用户类型，若该用户是WiFi用户，则将该用户加入到其关联AP使用的第i个载波上的WiFi用户组，并对
Figure BDA00031971899200000212
进行加一操作；若该用户是LTE-U用户，则不为其立即选择和分配载波，而是先记录该新用户，等到当前周期结束前再为其进行载波选择；(2) During the t-th CSAT cycle, according to the dynamic arrival or departure of users in the coexisting network, update the number of users that need to be served on each carrier: if one user (WiFi user or LTE-U user) completes transmission and leaves coexistence network, the user is removed from the corresponding user group on the carrier it is using, and the
Figure BDA00031971899200000210
or
Figure BDA00031971899200000211
Perform a subtraction operation; if a new user arrives in the coexisting network, first determine the type of the new user, if the user is a WiFi user, add the user to the WiFi user group on the i-th carrier used by its associated AP, and compare the
Figure BDA00031971899200000212
Add one operation; if the user is an LTE-U user, the carrier is not selected and allocated immediately, but the new user is recorded first, and then the carrier selection is performed for it before the end of the current period;

(3)在第t个CSAT周期结束前，为该周期内到达的所有LTE-U新用户选择合适的载波：根据LTE-U新用户到达的时间顺序，依次为该周期内到达的所有LTE-U新用户选择合适的载波。(3) Before the end of the t-th CSAT cycle, select the appropriate carrier for all LTE-U new users arriving in this cycle: according to the time sequence of the arrival of LTE-U new users, sequentially select all LTE-U new users arriving in this cycle U new user selects the appropriate carrier.

本发明方法中，步骤(1)—(3)中，采用一种基于网络虚拟化技术的LTE-U系统与WiFi系统融合网络架构，用以在LTE-U系统和WiFi系统之间共享信息。该融合网络架构描述如下：In the method of the present invention, in steps (1)-(3), an integrated network architecture of the LTE-U system and the WiFi system based on network virtualization technology is adopted to share information between the LTE-U system and the WiFi system. The converged network architecture is described as follows:

一个LTE-U子系统和多个WiFi子系统在非授权频段共存；在此共存网络中，LTE-U子系统由一个基站BS和若干均匀分布的用户UE组成，各LTE-U用户具有特定的吞吐量需求；每个WiFi子系统由一个AP和若干均匀分布的用户STA组成；假设非授权频段共有N个正交的成分载波，分别表示为CC1,CC2,…,CCN；每个CC可被LTE-U系统和一个WiFi系统所共享；每个WiFi AP使用一个载波，为了避免由于地理位置邻近而造成的严重同频干扰，进一步假设不同的WiFi AP使用不同的载波，从而可以忽略不同WiFi AP之间的相互干扰；LTE-U BS可使用所有N个载波为LTE-U用户提供服务；LTE-U系统下行传输采用基站集中调度的OFDMA信道接入机制，为用户分配时频资源；WiFi系统采用802.11n基于竞争的CSMA/CA信道接入机制，用户以竞争的方式接入信道；每一个载波上均采用基于时分复用的F-CSAT机制协调两个系统的共存。One LTE-U subsystem and multiple WiFi subsystems coexist in the unlicensed frequency band; in this coexistence network, the LTE-U subsystem consists of a base station BS and several evenly distributed user UEs, and each LTE-U user has a specific Throughput requirements; each WiFi subsystem consists of one AP and several evenly distributed user STAs; it is assumed that there are N orthogonal component carriers in the unlicensed frequency band, denoted as CC 1 , CC 2 ,..., CC N ; each The CC can be shared by the LTE-U system and a WiFi system; each WiFi AP uses one carrier. In order to avoid severe co-channel interference caused by geographical proximity, it is further assumed that different WiFi APs use different carriers, which can be ignored. Mutual interference between different WiFi APs; LTE-U BS can use all N carriers to serve LTE-U users; LTE-U system downlink transmission adopts OFDMA channel access mechanism centrally scheduled by base stations to allocate time-frequency resources for users ; The WiFi system adopts the 802.11n competition-based CSMA/CA channel access mechanism, and users access the channel in a competitive manner; each carrier adopts the time-division multiplexing-based F-CSAT mechanism to coordinate the coexistence of the two systems.

本方法采用基于网络虚拟化技术的LTE-U系统与WiFi系统融合网络架构，将LTE-U系统与WiFi系统中的物理实体LTE-U BS和WiFi AP分别虚拟化为对应的虚拟化网络实体vBS(virtual BS)和vAP(virtual AP)，通过软件定义网络(Software Defined Network，SDN)技术对虚拟实体进行管理。LTE-U BS虚拟实体(vBS)和WiFi AP虚拟实体(vAP)由一个SDN控制器统一控制，从LTE-U BS和WiFi AP物理实体接收无线接入网侧的负载强度、用户吞吐量需求和信道状态等信息。LTE-U BS可以使用N个载波为LTE-U用户提供服务，且LTE-U用户具有特定的吞吐量需求。虚拟实体之间互通所接收到的信息，据此为LTE-U用户选择合适的载波，以满足LTE-U用户的吞吐量需求。The method adopts the network architecture of the LTE-U system and the WiFi system based on the network virtualization technology, and virtualizes the physical entities LTE-U BS and WiFi AP in the LTE-U system and the WiFi system into corresponding virtualized network entities vBS respectively. (virtual BS) and vAP (virtual AP), manage virtual entities through a software-defined network (Software Defined Network, SDN) technology. The LTE-U BS virtual entity (vBS) and the WiFi AP virtual entity (vAP) are unifiedly controlled by an SDN controller, and receive the radio access network side load strength, user throughput requirements and data from the LTE-U BS and WiFi AP physical entities. Channel status and other information. An LTE-U BS can use N carriers to serve LTE-U users, and LTE-U users have specific throughput requirements. The received information is exchanged between virtual entities, and a suitable carrier is selected for the LTE-U user accordingly to meet the throughput requirement of the LTE-U user.

本发明方法中，步骤(2)中，根据当前CSAT周期内用户的动态到达或离去，更新载波上的用户信息，其具体过程为：In the method of the present invention, in step (2), the user information on the carrier is updated according to the dynamic arrival or departure of the user in the current CSAT cycle, and the specific process is as follows:

第t个CSAT周期开始时，共存网络中第i个载波上需要服务的WiFi用户和LTE-U用户数分别为

Figure BDA0003197189920000031
和
Figure BDA0003197189920000032
首先设置：
Figure BDA0003197189920000033
At the beginning of the t-th CSAT cycle, the numbers of WiFi users and LTE-U users that need to be served on the i-th carrier in the coexisting network are
Figure BDA0003197189920000031
and
Figure BDA0003197189920000032
First set up:
Figure BDA0003197189920000033

在第t个CSAT周期内，当一个用户完成传输后离开共存网络时，若该用户是WiFi用户，则将该用户移出所使用的CCi上的WiFi用户组，即：

Figure BDA0003197189920000034
在第t+1个CSAT周期不再占用CCi；若该用户是LTE-U用户，则对于该用户所使用的载波集合中的每一个CCi，将该用户移出CCi上的LTE-U用户组，即：
Figure BDA0003197189920000035
Figure BDA0003197189920000036
在第t+1个CSAT周期不再占用集合中的载波。In the t-th CSAT cycle, when a user leaves the coexisting network after completing the transmission, if the user is a WiFi user, the user is removed from the WiFi user group on the CC i used, that is:
Figure BDA0003197189920000034
CC i is no longer occupied in the t+1th CSAT cycle; if the user is an LTE-U user, then for each CC i in the carrier set used by the user, the user is moved out of the LTE-U on CC i User group, i.e.:
Figure BDA0003197189920000035
Figure BDA0003197189920000036
The carriers in the set are no longer occupied in the t+1th CSAT cycle.

在第t个CSAT周期内，当一个新用户到达共存网络时，若该用户是WiFi用户，则首先获取该用户关联的AP，然后将该用户加入到其关联AP所使用的CCi上的WiFi用户组，即：

Figure BDA0003197189920000037
从第t+1个周期开始竞争接入信道。若该用户是LTE-U用户，则不立即为其选择和分配载波，而是等到该周期结束前再进行载波选择。In the t-th CSAT cycle, when a new user arrives on the coexisting network, if the user is a WiFi user, first obtain the AP associated with the user, and then add the user to the WiFi on CC i used by the associated AP User group, i.e.:
Figure BDA0003197189920000037
The competition for access to the channel starts from the t+1th cycle. If the user is an LTE-U user, the carrier will not be selected and allocated immediately, but will be selected before the end of the period.

本发明方法中，步骤(3)中，在当前CSAT周期结束前，为该周期到达的所有LTE-U新用户选择合适的载波，其具体过程为：In the method of the present invention, in step (3), before the end of the current CSAT cycle, a suitable carrier is selected for all LTE-U new users arriving in the cycle, and the specific process is as follows:

第t个CSAT周期结束前，第i个载波上的WiFi用户和LTE-U用户数相对于该周期开始时会发生变化，此时可以认为第t+1个CSAT周期开始时第i个载波上需要服务的WiFi用户数

Figure BDA0003197189920000041
已经确定，而第i个载波上需要服务的LTE-U用户数
Figure BDA0003197189920000042
则要根据载波选择的结果才能确定。在进行载波选择时，根据LTE-U新用户到达的时间顺序，依次为该周期内到达的所有LTE-U新用户选择和分配合适的载波。Before the end of the t-th CSAT cycle, the number of WiFi users and LTE-U users on the i-th carrier will change relative to the beginning of the cycle. At this time, it can be considered that at the beginning of the t+1-th CSAT cycle Number of WiFi users requiring service
Figure BDA0003197189920000041
has been determined, and the number of LTE-U users to be served on the i-th carrier
Figure BDA0003197189920000042
Then it can only be determined according to the result of carrier selection. During carrier selection, according to the time sequence of the arrival of new LTE-U users, a suitable carrier is selected and allocated for all new LTE-U users arriving in the period in turn.

假设在为一个LTE-U新到达用户进行载波选择时，第i个载波上已分配有

Figure BDA0003197189920000043
个LTE-U用户，且第i个载波上的第k个LTE-U用户的吞吐量需求为
Figure BDA0003197189920000044
则第i个载波上LTE-U用户当前的吞吐量总需求为：It is assumed that when carrier selection is performed for a newly arrived user of LTE-U, the i-th carrier has been allocated with
Figure BDA0003197189920000043
LTE-U users, and the throughput requirement of the kth LTE-U user on the ith carrier is
Figure BDA0003197189920000044
Then the current total throughput requirement of LTE-U users on the i-th carrier is:

Figure BDA0003197189920000045
Figure BDA0003197189920000045

假设该新LTE-U用户的吞吐量需求为

Figure BDA0003197189920000046
则无论为该用户选择哪个(些)载波，所选择的载波应该满足其吞吐量需求，同时必须保障所选择的载波上已分配LTE-U用户的吞吐量总需求。如果新LTE-U用户被分配到第i个成分载波上，该载波当前能够为新用户提供的最大吞吐量为：Suppose the throughput requirement of this new LTE-U user is
Figure BDA0003197189920000046
Then no matter which carrier(s) are selected for the user, the selected carrier should meet its throughput requirement, and at the same time, the total throughput requirement of the allocated LTE-U users on the selected carrier must be guaranteed. If a new LTE-U user is allocated to the i-th component carrier, the current maximum throughput that the carrier can provide for the new user is:

Figure BDA0003197189920000047
Figure BDA0003197189920000047

其中R(n)表示有n个用户的WiFi系统独自占用第i个载波时能够获得的系统吞吐量，

Figure BDA0003197189920000048
表示LTE-U系统独自占用第i个成分载波时能够获得的系统吞吐量，
Figure BDA0003197189920000049
表示在为新LTE-U用户进行载波选择时第i个载波上LTE-U OFF占空比的临时值。因为只有当所有的LTE-U用户完成载波选择后，第t+1个周期每个载波上的用户分配情况和LTE-U OFF占空比才能确定，这个临时的值仅与当前已完成的载波选择结果有关。在WiFi用户数确定的情况下，如果之后还有其他LTE-U用户选择第i个载波，LTE-U ON占空比会随着LTE-U用户的增加而增大，因此能够保障已完成载波选择的LTE-U用户的吞吐量需求，即后面用户的载波选择不会影响前面用户的载波选择的结果。where R(n) represents the system throughput that can be obtained when a WiFi system with n users occupies the i-th carrier alone,
Figure BDA0003197189920000048
represents the system throughput that can be obtained when the LTE-U system occupies the i-th component carrier alone,
Figure BDA0003197189920000049
Represents the temporary value of the LTE-U OFF duty cycle on the ith carrier when carrier selection is performed for a new LTE-U user. Because only after all LTE-U users complete the carrier selection, the user assignment on each carrier in the t+1th cycle and the LTE-U OFF duty cycle can be determined. This temporary value is only related to the currently completed carrier. selection results. When the number of WiFi users is determined, if other LTE-U users select the i-th carrier later, the LTE-U ON duty cycle will increase with the increase of LTE-U users, so it can ensure that the completed carrier The throughput requirement of the selected LTE-U user, that is, the carrier selection of the latter user will not affect the result of the carrier selection of the former user.

在上述假设和分析情况下，本发明所考虑的成分载波选择问题就是在保障LTE-U系统和WiFi系统共存公平性以及网络中现有LTE-U用户吞吐量需求的条件下，在第t个CSAT周期结束时，为该周期内到达的每一个LTE-U用户选择最小数量的一组成分载波I*，以满足用户的吞吐量需求，即：Under the above assumptions and analysis conditions, the component carrier selection problem considered in the present invention is to ensure the fairness of coexistence of the LTE-U system and the WiFi system and the throughput requirements of the existing LTE-U users in the network. At the end of the CSAT cycle, a minimum number of component carriers I* are selected for each LTE-U user arriving in the cycle to meet the user's throughput requirements, namely:

优化目标：

Figure BDA0003197189920000051
optimize the target:
Figure BDA0003197189920000051

约束条件：

Figure BDA0003197189920000052
其中I*表示为LTE-U新用户选择的一组成分载波，C表示为LTE-U新用户选择的载波的数量，M表示载波选择数量的上限(C≤M)；式(4)表示任意C-1个载波无法满足新用户的吞吐量需求而存在C个载波能够满足新用户的吞吐量需求。若任意M个载波都无法满足新用户的吞吐量需求，将拒绝该用户接入网络。Restrictions:
Figure BDA0003197189920000052
where I* represents a group of component carriers selected by new LTE-U users, C represents the number of carriers selected by new LTE-U users, and M represents the upper limit of the number of carrier selections (C≤M); Equation (4) represents any C-1 carriers cannot meet the throughput requirements of the new users, but there are C carriers that can meet the throughput requirements of the new users. If any M carriers cannot meet the throughput requirement of the new user, the user will be denied access to the network.

在为LTE-U新用户选择载波时，首先判断是否存在单个载波能够满足新用户的吞吐量需求。若存在，则在所有能够满足需求的单个载波中选取能够为LTE-U新用户提供最大吞吐量的载波i*；若任意单个载波均不能满足新用户的吞吐量需求，则依次增加载波选择的数量C，直到任意C-1个载波无法满足新用户的吞吐量需求而存在C个载波能够满足新用户的吞吐量需求。若存在多组C个载波能够满足需求，则在其中选取能够为LTE-U新用户提供最大总吞吐量的一组C个载波I*；若任意M个载波均无法满足新用户的吞吐量需求，则拒绝该用户接入LTE-U系统。LTE-U新用户载波选择的主要步骤如下：When selecting a carrier for a new LTE-U user, it is first determined whether there is a single carrier that can meet the throughput requirement of the new user. If it exists, select the carrier i * that can provide the maximum throughput for LTE-U new users from all the single carriers that can meet the requirements; if any single carrier cannot meet the throughput requirements of the new users, then increase the carrier selection in turn. The number C, until any C-1 carriers cannot meet the throughput requirement of the new user and there are C carriers that can meet the throughput requirement of the new user. If there are multiple groups of C carriers that can meet the requirements, select a group of C carriers I * that can provide the maximum total throughput for new LTE-U users; if any M carriers cannot meet the throughput requirements of new users , the user is denied access to the LTE-U system. The main steps of LTE-U new user carrier selection are as follows:

a)在为一个LTE-U新用户选择载波时，先获取该用户的吞吐量需求

Figure BDA0003197189920000053
a) When selecting a carrier for a new LTE-U user, first obtain the throughput requirement of the user
Figure BDA0003197189920000053

b)计算每个CCi当前能够为新用户提供的最大吞吐量

Figure BDA0003197189920000054
b) Calculate the maximum throughput that each CC i can currently provide to new users
Figure BDA0003197189920000054

c)将所有N个载波根据

Figure BDA0003197189920000055
降序排列，即
Figure BDA0003197189920000056
c) put all N carriers according to
Figure BDA0003197189920000055
Sort in descending order, that is
Figure BDA0003197189920000056

d)将载波选择数量C的初始值设置为1。若前C个载波能够满足该用户的吞吐量需求，即

Figure BDA0003197189920000057
该用户完成载波选择；否则，依次增加载波选择的数量C，直到前C个载波能够满足该用户的吞吐量需求。若前M个载波无法满足新用户的吞吐量需求，则拒绝该用户接入LTE-U系统。d) Set the initial value of the carrier selection number C to 1. If the first C carriers can meet the throughput requirement of the user, that is
Figure BDA0003197189920000057
The user completes the carrier selection; otherwise, the number C of carrier selections is sequentially increased until the first C carriers can meet the throughput requirement of the user. If the first M carriers cannot meet the throughput requirement of the new user, the user is refused to access the LTE-U system.

有益效果beneficial effect

与现有技术相比，本发明具有以下优点：Compared with the prior art, the present invention has the following advantages:

1)本发明考虑到实际场景中用户吞吐量需求的差异性和非授权频段上信道质量的不稳定性，LTE-U基站不限于在单个频带内调度时频资源，而是通过采用载波聚合(Carrier aggregation,CA)技术，使用户可以同时使用非授权频段的多个正交成分载波，以满足用户对吞吐量的特定需求，符合实际工程应用中的需求。1) The present invention takes into account the differences in user throughput requirements in actual scenarios and the instability of channel quality on unlicensed frequency bands. The LTE-U base station is not limited to scheduling time-frequency resources in a single frequency band, but by adopting carrier aggregation ( Carrier aggregation, CA) technology enables users to use multiple orthogonal component carriers of unlicensed frequency bands at the same time to meet users' specific requirements for throughput and meet the needs of practical engineering applications.

2)本发明提供的一种面向吞吐量需求的LTE-U系统成分载波选择方法，在保障LTE-U和WiFi共存公平性以及网络中现有LTE-U用户吞吐量需求的条件下，根据LTE-U新用户的吞吐量需求为其选择一个或者多个合适的载波，有效地提升了共存网络的LTE-U用户满意度。2) The present invention provides a throughput requirement-oriented LTE-U system component carrier selection method, under the condition of ensuring the fairness of LTE-U and WiFi coexistence and the throughput requirement of existing LTE-U users in the network, according to LTE -U selects one or more suitable carriers for the throughput requirements of new users, which effectively improves the LTE-U user satisfaction of the coexisting network.

附图说明Description of drawings

图1-面向吞吐量需求的LTE-U系统成分载波选择方法流程示意图Figure 1 - Schematic flow chart of component carrier selection method in LTE-U system based on throughput requirements

图2-基于融合网络架构的LTE-U和WiFi共存网络场景示意图Figure 2 - Schematic diagram of LTE-U and WiFi coexistence network scenario based on converged network architecture

图3-LTE-U用户载波选择步骤流程示意图Figure 3-Schematic flow chart of the steps of LTE-U user carrier selection

具体实施方式Detailed ways

下面结合附图对本发明作更进一步的说明。本发明提供一种面向吞吐量需求的LTE-U系统成分载波选择方法，如图1所示，按如下步骤实施：The present invention will be further described below in conjunction with the accompanying drawings. The present invention provides a throughput requirement-oriented LTE-U system component carrier selection method, as shown in FIG. 1 , which is implemented according to the following steps:

(1)初始化下一CSAT周期开始时共存网络用户信息：假设第t个CSAT周期开始时共存网络中第i个载波上需要服务的WiFi用户和LTE-U用户数分别为

Figure BDA0003197189920000061
和
Figure BDA0003197189920000062
由于在该周期内共存网络中会有WiFi用户和LTE-U用户动态地到达或离去，第t+1个CSAT周期开始时第i个载波上的用户数
Figure BDA0003197189920000063
和
Figure BDA0003197189920000064
分别会有相应的增加或减少。为了确定
Figure BDA0003197189920000065
和
Figure BDA0003197189920000066
首先设置：
Figure BDA0003197189920000067
然后随着用户的到达或离去，对
Figure BDA0003197189920000068
和
Figure BDA0003197189920000069
进行增减。(1) Initialize coexistence network user information at the beginning of the next CSAT cycle: Assume that the number of WiFi users and LTE-U users that need to be served on the ith carrier in the coexistence network at the beginning of the tth CSAT cycle are respectively
Figure BDA0003197189920000061
and
Figure BDA0003197189920000062
Since there will be WiFi users and LTE-U users dynamically arriving or leaving in the coexisting network during this period, the number of users on the i-th carrier at the beginning of the t+1-th CSAT period
Figure BDA0003197189920000063
and
Figure BDA0003197189920000064
There will be a corresponding increase or decrease, respectively. to confirm
Figure BDA0003197189920000065
and
Figure BDA0003197189920000066
First set up:
Figure BDA0003197189920000067
Then as the user arrives or leaves, right
Figure BDA0003197189920000068
and
Figure BDA0003197189920000069
Increase or decrease.

本发明方法针对由单个LTE-U子系统和多个WiFi子系统组成的一个非授权频段共存网络，如图2所示。在此共存网络中，LTE-U子系统由一个基站BS和若干均匀分布的用户UE组成，各LTE-U用户具有特定的吞吐量需求。每个WiFi子系统由一个AP和若干均匀分布的用户STA组成。假设非授权频段共有N个正交的成分载波(Component Carrier，CC)，分别表示为CC1,CC2,…,CCN。每个CC可以被LTE-U系统和一个WiFi系统所共享。每个WiFi AP使用一个载波。为了避免由于地理位置邻近而造成的严重同频干扰，进一步假设不同的WiFi AP使用不同的载波，从而可以忽略不同WiFi AP之间的相互干扰。LTE-U BS可以使用所有N个载波为LTE-U用户提供服务。LTE-U系统下行传输采用基站集中调度的OFDMA信道接入机制为用户分配时频资源；WiFi系统采用802.11n基于竞争的CSMA/CA信道接入机制，用户以竞争的方式接入信道。每一个载波上均采用基于时分复用的F-CSAT机制协调两个系统的共存。The method of the present invention is directed to an unlicensed frequency band coexistence network composed of a single LTE-U subsystem and multiple WiFi subsystems, as shown in FIG. 2 . In this coexistence network, the LTE-U subsystem consists of one base station BS and several evenly distributed user UEs, and each LTE-U user has specific throughput requirements. Each WiFi subsystem consists of one AP and several evenly distributed user STAs. It is assumed that there are N orthogonal component carriers (Component Carrier, CC) in the unlicensed frequency band, which are denoted as CC 1 , CC 2 , . . . , CC N respectively. Each CC can be shared by an LTE-U system and a WiFi system. Each WiFi AP uses one carrier. In order to avoid serious co-channel interference caused by geographical proximity, it is further assumed that different WiFi APs use different carriers, so that the mutual interference between different WiFi APs can be ignored. The LTE-U BS can serve LTE-U users using all N carriers. The downlink transmission of the LTE-U system uses the OFDMA channel access mechanism centrally scheduled by the base station to allocate time-frequency resources to users; the WiFi system uses the 802.11n competition-based CSMA/CA channel access mechanism, and users access the channel in a competitive manner. On each carrier, the F-CSAT mechanism based on time division multiplexing is used to coordinate the coexistence of the two systems.

本发明方法采用基于网络虚拟化技术的LTE-U系统与WiFi系统融合网络架构，将LTE-U系统与WiFi系统中的物理实体LTE-U BS和WiFi AP分别虚拟化为对应的虚拟化网络实体vBS(virtual BS)和vAP(virtual AP)，通过软件定义网络(Software DefinedNetwork，SDN)技术对虚拟实体进行管理。LTE-U BS虚拟实体(vBS)和WiFi AP虚拟实体(vAP)由一个SDN控制器统一控制，从LTE-U BS和WiFi AP物理实体接收无线接入网侧的负载强度、用户吞吐量需求和信道状态等信息。LTE-U BS可以使用N个载波为LTE-U用户提供服务，且LTE-U用户具有特定的吞吐量需求。虚拟实体之间互通所接收到的信息，据此为LTE-U用户选择合适的载波，以满足LTE-U用户的吞吐量需求。The method of the invention adopts the network architecture of LTE-U system and WiFi system fusion based on network virtualization technology, and virtualizes the physical entities LTE-U BS and WiFi AP in the LTE-U system and WiFi system into corresponding virtualized network entities respectively. vBS (virtual BS) and vAP (virtual AP) manage virtual entities through a software defined network (Software Defined Network, SDN) technology. The LTE-U BS virtual entity (vBS) and the WiFi AP virtual entity (vAP) are unifiedly controlled by an SDN controller, and receive the radio access network side load strength, user throughput requirements and data from the LTE-U BS and WiFi AP physical entities. Channel status and other information. An LTE-U BS can use N carriers to serve LTE-U users, and LTE-U users have specific throughput requirements. The received information is exchanged between virtual entities, and a suitable carrier is selected for the LTE-U user accordingly to meet the throughput requirement of the LTE-U user.

(2)在第t个CSAT周期内，根据共存网络中用户的动态到达或离去，更新载波上的用户信息：(2) During the t-th CSAT cycle, update the user information on the carrier according to the dynamic arrival or departure of users in the coexisting network:

第t个CSAT周期开始时，共存网络中第i个载波上需要服务的WiFi用户和LTE-U用户数分别为

Figure BDA0003197189920000071
和
Figure BDA0003197189920000072
首先设置：
Figure BDA0003197189920000073
At the beginning of the t-th CSAT cycle, the numbers of WiFi users and LTE-U users that need to be served on the i-th carrier in the coexisting network are
Figure BDA0003197189920000071
and
Figure BDA0003197189920000072
First set up:
Figure BDA0003197189920000073

在第t个CSAT周期内，当一个用户完成传输完成后离开共存网络时，若该用户是WiFi用户，则将该用户移出所使用的CCi上的WiFi用户组，即：

Figure BDA0003197189920000074
在第t+1个CSAT周期不再占用CCi；若该用户是LTE-U用户，则对于该用户所使用的载波集合中的每一个CCi，将该用户移出CCi上的LTE-U用户组，即：
Figure BDA0003197189920000075
Figure BDA0003197189920000076
在第t+1个CSAT周期不再占用集合中的载波。In the t-th CSAT cycle, when a user leaves the coexisting network after completing the transmission, if the user is a WiFi user, the user is removed from the WiFi user group on the CC i used, that is:
Figure BDA0003197189920000074
CC i is no longer occupied in the t+1th CSAT cycle; if the user is an LTE-U user, then for each CC i in the carrier set used by the user, the user is moved out of the LTE-U on CC i User group, i.e.:
Figure BDA0003197189920000075
Figure BDA0003197189920000076
The carriers in the set are no longer occupied in the t+1th CSAT cycle.

在第t个CSAT周期内，当一个新用户到达共存网络时，若该用户是WiFi用户，则首先获取该用户关联的AP，然后将该用户加入到其关联AP所使用的CCi上的WiFi用户组，即：

Figure BDA0003197189920000077
从第t+1个周期开始竞争接入信道。若该用户是LTE-U用户，则不立即为其选择和分配载波，而是等到该周期结束前再进行载波选择。In the t-th CSAT cycle, when a new user arrives on the coexisting network, if the user is a WiFi user, first obtain the AP associated with the user, and then add the user to the WiFi on CC i used by the associated AP User group, i.e.:
Figure BDA0003197189920000077
The competition for access to the channel starts from the t+1th cycle. If the user is an LTE-U user, the carrier will not be selected and allocated immediately, but will be selected before the end of the period.

(3)在第t个CSAT周期结束前，为该周期内到达的所有LTE-U新用户选择合适的载波：(3) Before the end of the t-th CSAT cycle, select a suitable carrier for all new LTE-U users arriving in this cycle:

第t个CSAT周期结束前，第i个载波上的WiFi用户和LTE-U用户数相对于该周期开始时会发生变化，此时可以认为第t+1个CSAT周期开始时第i个载波上需要服务的WiFi用户数

Figure BDA0003197189920000081
已经确定，而第i个载波上需要服务的LTE-U用户数
Figure BDA0003197189920000082
则要根据载波选择的结果才能确定。在进行载波选择时，根据LTE-U新用户到达的时间顺序，依次为该周期内到达的所有nL(t)个LTE-U新用户选择和分配合适的载波。Before the end of the t-th CSAT cycle, the number of WiFi users and LTE-U users on the i-th carrier will change relative to the beginning of the cycle. At this time, it can be considered that at the beginning of the t+1-th CSAT cycle Number of WiFi users requiring service
Figure BDA0003197189920000081
has been determined, and the number of LTE-U users to be served on the i-th carrier
Figure BDA0003197189920000082
Then it can only be determined according to the result of carrier selection. During carrier selection, according to the time sequence of the arrival of new LTE-U users, a suitable carrier is selected and allocated for all n L (t) new LTE-U users arriving in the period in turn.

假设在为一个LTE-U新到达用户进行载波选择时，第i个载波上已分配有

Figure BDA0003197189920000083
个LTE-U用户，且第i个载波上的第k个LTE-U用户的吞吐量需求为
Figure BDA0003197189920000084
则第i个载波上LTE-U用户当前的吞吐量总需求为：It is assumed that when carrier selection is performed for a newly arrived user of LTE-U, the i-th carrier has been allocated with
Figure BDA0003197189920000083
LTE-U users, and the throughput requirement of the kth LTE-U user on the ith carrier is
Figure BDA0003197189920000084
Then the current total throughput requirement of LTE-U users on the i-th carrier is:

Figure BDA0003197189920000085
Figure BDA0003197189920000085

假设该新LTE-U用户的吞吐量需求为

Figure BDA0003197189920000086
则无论为该用户选择哪个(些)载波，所选择的载波应该满足其吞吐量需求，同时必须保障所选择的载波上已分配LTE-U用户的吞吐量总需求。如果新LTE-U用户被分配到第i个成分载波上，该载波当前能够为新用户提供的最大吞吐量为：Suppose the throughput requirement of this new LTE-U user is
Figure BDA0003197189920000086
Then no matter which carrier(s) are selected for the user, the selected carrier should meet its throughput requirement, and at the same time, the total throughput requirement of the allocated LTE-U users on the selected carrier must be guaranteed. If a new LTE-U user is allocated to the i-th component carrier, the current maximum throughput that the carrier can provide for the new user is:

Figure BDA0003197189920000087
Figure BDA0003197189920000087

其中R(n)表示有n个用户的WiFi系统独自占用第i个载波时能够获得的系统吞吐量，

Figure BDA0003197189920000088
表示LTE-U系统独自占用第i个成分载波时能够获得的系统吞吐量，
Figure BDA0003197189920000089
表示在为新LTE-U用户进行载波选择时第i个载波上LTE-U OFF占空比的临时值。因为只有当所有的LTE-U用户完成载波选择时，第t+1个周期每个载波上的用户分配情况和LTE-UOFF占空比才能确定，这个临时的值仅与当前已完成的载波选择结果有关。在WiFi用户数确定的情况下，如果之后还有其他LTE-U用户选择第i个载波，LTE-U ON占空比会随着LTE-U用户的增加而增大，因此能够保障已完成载波选择的LTE-U用户的吞吐量需求，即后面用户的载波选择不会影响前面用户的载波选择的结果。where R(n) represents the system throughput that can be obtained when a WiFi system with n users occupies the i-th carrier alone,
Figure BDA0003197189920000088
represents the system throughput that can be obtained when the LTE-U system occupies the i-th component carrier alone,
Figure BDA0003197189920000089
Represents the temporary value of the LTE-U OFF duty cycle on the ith carrier when carrier selection is performed for a new LTE-U user. Because the user allocation and LTE-UOFF duty cycle on each carrier in the t+1th cycle can only be determined when all LTE-U users have completed carrier selection, this temporary value is only related to the currently completed carrier selection. results are related. When the number of WiFi users is determined, if other LTE-U users select the i-th carrier later, the LTE-U ON duty cycle will increase with the increase of LTE-U users, so it can ensure that the completed carrier The throughput requirement of the selected LTE-U user, that is, the carrier selection of the latter user will not affect the result of the carrier selection of the former user.

在上述假设和分析情况下，本发明所考虑的成分载波选择问题就是在保障LTE-U系统和WiFi系统共存公平性以及网络中现有LTE-U用户吞吐量需求的条件下，在第t个CSAT周期结束时，为该周期内到达的每一个LTE-U用户选择最小数量的一组成分载波I*，以满足用户的吞吐量需求，即：Under the above assumptions and analysis conditions, the component carrier selection problem considered in the present invention is to ensure the fairness of coexistence of the LTE-U system and the WiFi system and the throughput requirements of the existing LTE-U users in the network. At the end of the CSAT cycle, a minimum number of component carriers I* are selected for each LTE-U user arriving in the cycle to meet the user's throughput requirements, namely:

优化目标：

Figure BDA0003197189920000091
optimize the target:
Figure BDA0003197189920000091

约束条件：

Figure BDA0003197189920000092
Restrictions:
Figure BDA0003197189920000092

其中I*表示为LTE-U新用户选择的一组成分载波，C表示为LTE-U新用户选择的载波的数量，M表示载波选择数量的上限(C≤M)；式(4)表示任意C-1个载波无法满足新用户的吞吐量需求而存在C个载波能够满足新用户的吞吐量需求。若任意M个载波都无法满足新用户的吞吐量需求，将拒绝该用户接入网络。where I* represents a group of component carriers selected by new LTE-U users, C represents the number of carriers selected by new LTE-U users, and M represents the upper limit of the number of carrier selections (C≤M); Equation (4) represents any C-1 carriers cannot meet the throughput requirements of the new users, but there are C carriers that can meet the throughput requirements of the new users. If any M carriers cannot meet the throughput requirement of the new user, the user will be denied access to the network.

在为LTE-U新用户选择载波时，首先判断是否存在单个载波能够满足新用户的吞吐量需求。若存在，则在所有能够满足需求的单个载波中选取能够为LTE-U新用户提供最大吞吐量的载波i*；若任意单个载波均不能满足新用户的吞吐量需求，则依次增加载波选择的数量C，直到任意C-1个载波无法满足新用户的吞吐量需求而存在C个载波能够满足新用户的吞吐量需求。若存在多组C个载波能够满足需求，则在其中选取能够为LTE-U新用户提供最大总吞吐量的一组C个载波I*；若任意M个载波均无法满足新用户的吞吐量需求，则拒绝该用户接入LTE-U系统。LTE-U新用户载波选择的主要步骤如图3所示，描述如下：When selecting a carrier for a new LTE-U user, it is first determined whether there is a single carrier that can meet the throughput requirement of the new user. If it exists, select the carrier i * that can provide the maximum throughput for LTE-U new users from all the single carriers that can meet the requirements; if any single carrier cannot meet the throughput requirements of the new users, then increase the carrier selection in turn. The number C, until any C-1 carriers cannot meet the throughput requirement of the new user and there are C carriers that can meet the throughput requirement of the new user. If there are multiple groups of C carriers that can meet the requirements, select a group of C carriers I * that can provide the maximum total throughput for new LTE-U users; if any M carriers cannot meet the throughput requirements of new users , the user is denied access to the LTE-U system. The main steps of LTE-U new user carrier selection are shown in Figure 3 and described as follows:

a)在为一个LTE-U新用户选择载波时，先获取该用户的吞吐量需求

Figure BDA0003197189920000093
a) When selecting a carrier for a new LTE-U user, first obtain the throughput requirement of the user
Figure BDA0003197189920000093

b)计算每个CCi当前能够为新用户提供的最大吞吐量

Figure BDA0003197189920000094
b) Calculate the maximum throughput that each CC i can currently provide to new users
Figure BDA0003197189920000094

c)将所有N个载波根据

Figure BDA0003197189920000095
降序排列，即
Figure BDA0003197189920000096
c) put all N carriers according to
Figure BDA0003197189920000095
Sort in descending order, that is
Figure BDA0003197189920000096

d)将载波选择数量C的初始值设置为1。若前C个载波能够满足该用户的吞吐量需求，即

Figure BDA0003197189920000097
该用户的载波选择结束；否则，依次增加载波选择的数量C，直到前C个载波能够满足该用户的吞吐量需求。若前M个载波无法满足新用户的吞吐量需求，则拒绝该用户接入LTE-U系统。d) Set the initial value of the carrier selection number C to 1. If the first C carriers can meet the throughput requirement of the user, that is
Figure BDA0003197189920000097
The carrier selection of the user ends; otherwise, the number C of carrier selections is sequentially increased until the first C carriers can meet the throughput requirement of the user. If the first M carriers cannot meet the throughput requirement of the new user, the user is refused to access the LTE-U system.

Claims (3)

1.一种面向吞吐量需求的LTE-U系统成分载波选择方法，其特征在于：该成分载波选择方法包括以下步骤：1. A method for selecting a component carrier of an LTE-U system oriented to throughput requirements, characterized in that: the method for selecting a component carrier comprises the following steps: (1)在CSAT周期开始时，初始化下一CSAT周期开始时共存网络用户数：设置
Figure FDA0003607628530000011
其中t表示当前CSAT周期，t+1表示下一CSAT周期；
Figure FDA0003607628530000012
和
Figure FDA0003607628530000013
分别表示当前CSAT周期开始时共存网络中第i个载波上需要服务的WiFi用户数和LTE-U用户数；
Figure FDA0003607628530000014
和
Figure FDA0003607628530000015
分别表示下一CSAT周期开始时共存网络中第i个载波上需要服务的WiFi用户数和LTE-U用户数；(1) At the beginning of the CSAT cycle, initialize the number of coexisting network users at the beginning of the next CSAT cycle: set
Figure FDA0003607628530000011
where t represents the current CSAT cycle, and t+1 represents the next CSAT cycle;
Figure FDA0003607628530000012
and
Figure FDA0003607628530000013
respectively represent the number of WiFi users and the number of LTE-U users that need to be served on the i-th carrier in the coexisting network at the beginning of the current CSAT cycle;
Figure FDA0003607628530000014
and
Figure FDA0003607628530000015
respectively represent the number of WiFi users and the number of LTE-U users that need to be served on the i-th carrier in the coexisting network at the beginning of the next CSAT cycle; (2)在CSAT周期内，根据共存网络中用户的动态到达或离去，更新各载波上需要服务的用户信息：在当前CSAT周期内，若有一个用户完成传输后离开共存网络，则将该用户移出其所使用载波上的相应用户组，并对
Figure FDA0003607628530000016
或
Figure FDA0003607628530000017
进行减一操作；若有一个新用户到达共存网络，首先判断新用户类型，若该用户是WiFi用户，则将该用户加入到其关联AP使用的第i个载波上的WiFi用户组，并对
Figure FDA0003607628530000018
进行加一操作；若该用户是LTE-U用户，则不为其立即选择和分配载波，而是先记录该新用户，等到当前周期结束前再为其进行载波选择；(2) During the CSAT cycle, according to the dynamic arrival or departure of users in the coexistence network, update the user information that needs to be served on each carrier: in the current CSAT cycle, if a user completes transmission and leaves the coexistence network, the users move out of the corresponding user group on the carrier they use, and
Figure FDA0003607628530000016
or
Figure FDA0003607628530000017
Perform a subtraction operation; if a new user arrives in the coexisting network, first determine the type of the new user, if the user is a WiFi user, add the user to the WiFi user group on the i-th carrier used by its associated AP, and compare the
Figure FDA0003607628530000018
Add one operation; if the user is an LTE-U user, the carrier is not selected and allocated immediately, but the new user is recorded first, and then the carrier selection is performed for it before the end of the current period; (3)在CSAT周期结束前，为该周期内到达的所有LTE-U新用户选择合适的载波：在当前CSAT周期结束前，根据LTE-U新用户到达的时间顺序，依次为该周期内到达的所有LTE-U新用户选择合适的载波；(3) Before the end of the CSAT cycle, select a suitable carrier for all new LTE-U users arriving in the cycle: before the end of the current CSAT cycle, according to the time sequence of the arrival of new LTE-U users, the arrivals within the cycle are in turn. for all new LTE-U users to select the appropriate carrier; 步骤(3)中，在当前CSAT周期结束前，为该周期内到达的所有LTE-U新用户选择合适的载波，其具体过程为：In step (3), before the end of the current CSAT cycle, select a suitable carrier for all LTE-U new users arriving in the cycle, and the specific process is as follows: a)在为一个LTE-U新用户选择载波时，先获取该用户的吞吐量需求
Figure FDA0003607628530000019
a) When selecting a carrier for a new LTE-U user, first obtain the throughput requirement of the user
Figure FDA0003607628530000019
 b)计算每个成分载波CCi当前能够为新用户提供的最大吞吐量
Figure FDA00036076285300000110
b) Calculate the maximum throughput that each component carrier CC i can currently provide to new users
Figure FDA00036076285300000110
 c)将所有N个载波根据
Figure FDA00036076285300000111
降序排列，即
Figure FDA00036076285300000112
c) put all N carriers according to
Figure FDA00036076285300000111
Sort in descending order, that is
Figure FDA00036076285300000112
 d)将载波选择数量C的初始值设置为1；若前C个载波能够满足该用户的吞吐量需求，即
Figure FDA00036076285300000113
该用户的载波选择结束；否则，依次增加载波选择的数量C，直到前C个载波能够满足该用户的吞吐量需求；若前M个载波无法满足该用户的吞吐量需求，则拒绝该用户接入LTE-U系统；M表示载波选择数量的上限；d) Set the initial value of the carrier selection number C to 1; if the first C carriers can meet the throughput requirements of the user, that is,
Figure FDA00036076285300000113
The user's carrier selection ends; otherwise, the number C of carrier selections is increased in turn until the first C carriers can meet the user's throughput requirements; if the first M carriers cannot meet the user's throughput requirements, the user is rejected. into the LTE-U system; M represents the upper limit of the number of carrier selections; 步骤b)中，第i个成分载波CCi当前能够为新用户提供的最大吞吐量
Figure FDA0003607628530000021
为：In step b), the maximum throughput that the i-th component carrier CC i can currently provide for new users
Figure FDA0003607628530000021
for:
Figure FDA0003607628530000022
Figure FDA0003607628530000022
 其中
Figure FDA0003607628530000023
表示有
Figure FDA0003607628530000024
个用户的WiFi系统独自占用第i个载波时能够获得的系统吞吐量，
Figure FDA0003607628530000025
表示有
Figure FDA0003607628530000026
个用户的WiFi系统独自占用第i个载波时能够获得的系统吞吐量，
Figure FDA0003607628530000027
表示第i个载波上LTE-U用户当前的吞吐量总需求，
Figure FDA0003607628530000028
表示LTE-U系统独自占用第i个成分载波时能够获得的系统吞吐量，
Figure FDA0003607628530000029
表示在为新LTE-U用户进行载波选择时第i个载波上LTE-U OFF占空比的临时值，这个临时的值仅与当前已完成的载波选择结果有关。in
Figure FDA0003607628530000023
indicates that there is
Figure FDA0003607628530000024
The system throughput that can be obtained when each user's WiFi system occupies the i-th carrier alone,
Figure FDA0003607628530000025
indicates that there is
Figure FDA0003607628530000026
The system throughput that can be obtained when each user's WiFi system occupies the i-th carrier alone,
Figure FDA0003607628530000027
represents the current total throughput demand of LTE-U users on the i-th carrier,
Figure FDA0003607628530000028
represents the system throughput that can be obtained when the LTE-U system occupies the i-th component carrier alone,
Figure FDA0003607628530000029
Indicates the temporary value of the LTE-U OFF duty ratio on the i-th carrier when carrier selection is performed for a new LTE-U user, and this temporary value is only related to the currently completed carrier selection result. 2.如权利要求1所述的面向吞吐量需求的LTE-U系统成分载波选择方法，其特征在于，步骤(1)—(3)中，采用一种基于网络虚拟化技术的LTE-U系统与WiFi系统融合网络架构，用以在LTE-U系统和WiFi系统之间共享信息；该融合网络架构描述如下：2. the throughput requirement-oriented LTE-U system component carrier selection method as claimed in claim 1, is characterized in that, in step (1)-(3), adopts a kind of LTE-U system based on network virtualization technology The network architecture is integrated with the WiFi system to share information between the LTE-U system and the WiFi system; the integrated network architecture is described as follows: 一个LTE-U子系统和多个WiFi子系统在非授权频段共存；在此共存网络中，LTE-U子系统由一个基站BS和若干均匀分布的用户UE组成，各LTE-U用户具有特定的吞吐量需求；每个WiFi子系统由一个AP和若干均匀分布的用户STA组成；假设非授权频段共有N个正交的成分载波，分别表示为CC1,CC2,…,CCN；每个CC可被LTE-U系统和一个WiFi系统所共享；每个WiFiAP使用一个载波，不同的WiFi AP使用不同的载波；LTE-U BS可使用所有N个载波为LTE-U用户提供服务；LTE-U系统下行传输采用基站集中调度的OFDMA信道接入机制，为用户分配时频资源；WiFi系统采用802.11n基于竞争的CSMA/CA信道接入机制，用户以竞争的方式接入信道；每一个载波上均采用基于时分复用的F-CSAT机制协调两个系统的共存；One LTE-U subsystem and multiple WiFi subsystems coexist in the unlicensed frequency band; in this coexistence network, the LTE-U subsystem consists of a base station BS and several evenly distributed user UEs, and each LTE-U user has a specific Throughput requirements; each WiFi subsystem consists of one AP and several evenly distributed user STAs; it is assumed that there are N orthogonal component carriers in the unlicensed frequency band, denoted as CC 1 , CC 2 ,..., CC N ; each CC can be shared by LTE-U system and one WiFi system; each WiFi AP uses one carrier, and different WiFi APs use different carriers; LTE-U BS can use all N carriers to serve LTE-U users; LTE-U The downlink transmission of the U system adopts the OFDMA channel access mechanism centrally scheduled by the base station to allocate time-frequency resources for users; the WiFi system adopts the 802.11n competition-based CSMA/CA channel access mechanism, and users access the channel in a competitive manner; each carrier The F-CSAT mechanism based on time division multiplexing is used to coordinate the coexistence of the two systems; 将LTE-U系统与WiFi系统中的物理实体LTE-U BS和WiFi AP分别虚拟化为对应的虚拟化网络实体vBS和vAP，通过软件定义网络技术对虚拟实体进行管理；LTE-U BS虚拟化网络实体和WiFi AP虚拟化网络实体由一个SDN控制器统一控制，从LTE-U BS和WiFi AP物理实体接收无线接入网侧的负载强度、用户吞吐量需求和信道状态；LTE-U BS可使用N个载波为LTE-U用户提供服务，且LTE-U用户具有特定的吞吐量需求； 虚拟实体之间互通所接收到的信息，据此为LTE-U用户选择合适的载波，以满足LTE-U用户的吞吐量需求。The physical entities LTE-U BS and WiFi AP in the LTE-U system and the WiFi system are virtualized into corresponding virtualized network entities vBS and vAP respectively, and the virtual entities are managed through software-defined network technology; LTE-U BS virtualization The network entity and the WiFi AP virtualized network entity are uniformly controlled by an SDN controller, and receive the load strength, user throughput requirements and channel status on the radio access network side from the LTE-U BS and the WiFi AP physical entity; the LTE-U BS can Use N carriers to serve LTE-U users, and LTE-U users have specific throughput requirements; The received information is exchanged between virtual entities, and an appropriate carrier is selected for LTE-U users accordingly to meet the needs of LTE -U user's throughput requirement. 3.如权利要求1所述的面向吞吐量需求的LTE-U系统成分载波选择方法，其特征在于，步骤(2)中，根据当前CSAT周期内用户的动态到达或离去，更新载波上的用户信息，其具体过程为：3. the throughput requirement-oriented LTE-U system component carrier selection method as claimed in claim 1, is characterized in that, in step (2), according to the dynamic arrival or departure of the user in the current CSAT cycle, update on the carrier. User information, the specific process is as follows: 第t个CSAT周期开始时，共存网络中第i个载波上需要服务的WiFi用户和LTE-U用户数分别为
Figure FDA0003607628530000031
和
Figure FDA0003607628530000032
设置：
Figure FDA0003607628530000033
At the beginning of the t-th CSAT cycle, the numbers of WiFi users and LTE-U users that need to be served on the i-th carrier in the coexisting network are
Figure FDA0003607628530000031
and
Figure FDA0003607628530000032
set up:
Figure FDA0003607628530000033
 在第t个CSAT周期内，一个用户完成传输后离开共存网络：若该用户是WiFi用户，则将该用户移出其所使用的CCi上的WiFi用户组，即：
Figure FDA0003607628530000034
在第t+1个CSAT周期不再占用CCi；若该用户是LTE-U用户，则对于该用户使用的载波集合中的每一个CCi，将该用户移出CCi上的LTE-U用户组，即：
Figure FDA0003607628530000035
在第t+1个CSAT周期不再占用集合中的载波；In the t-th CSAT cycle, a user leaves the coexisting network after completing transmission: if the user is a WiFi user, the user is removed from the WiFi user group on CC i used by the user, that is:
Figure FDA0003607628530000034
CC i is no longer occupied in the t+1th CSAT cycle; if the user is an LTE-U user, then for each CC i in the carrier set used by the user, the user is removed from the LTE-U user on CC i group, that is:
Figure FDA0003607628530000035
The carrier in the set is no longer occupied in the t+1th CSAT cycle; 在第t个CSAT周期内，一个新用户到达共存网络：若该用户是WiFi用户，则首先获取该用户关联的AP，然后将该用户加入到其关联AP使用的CCi上的WiFi用户组，即：
Figure FDA0003607628530000036
使其从第t+1个周期开始竞争接入信道；若该用户是LTE-U用户，则不为其立即选择和分配载波，而是等到该周期结束前再进行载波选择。In the t-th CSAT cycle, a new user arrives at the coexistence network: if the user is a WiFi user, first obtain the AP associated with the user, and then add the user to the WiFi user group on CC i used by the associated AP, which is:
Figure FDA0003607628530000036
It starts to compete for access channels from the t+1th cycle; if the user is an LTE-U user, it does not select and allocate a carrier immediately, but waits until the end of the cycle to perform carrier selection.
CN202110894202.5A 2021-08-05 2021-08-05 A throughput requirement-oriented component carrier selection method for LTE-U system Active CN113613180B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110894202.5A CN113613180B (en) 2021-08-05 2021-08-05 A throughput requirement-oriented component carrier selection method for LTE-U system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110894202.5A CN113613180B (en) 2021-08-05 2021-08-05 A throughput requirement-oriented component carrier selection method for LTE-U system

Publications (2)

Publication Number Publication Date
CN113613180A CN113613180A (en) 2021-11-05
CN113613180B true CN113613180B (en) 2022-05-31

Family

ID=78306906

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110894202.5A Active CN113613180B (en) 2021-08-05 2021-08-05 A throughput requirement-oriented component carrier selection method for LTE-U system

Country Status (1)

Country Link
CN (1) CN113613180B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106332094A (en) * 2016-09-19 2017-01-11 重庆邮电大学 Coexistence Method of Dynamic Duty Cycle Based on Q Algorithm for Unlicensed Band LTE-U and WiFi System
US9999052B1 (en) * 2015-09-02 2018-06-12 Sprint Spectrum L.P. Selecting primary and secondary component carrier for carrier aggregation based on carrier group delay variation, insertion loss, and other carrier attributes
CN109756920A (en) * 2017-11-03 2019-05-14 北京佰才邦技术有限公司 A kind of data transmission method, terminal and the network equipment
CN110446266A (en) * 2019-09-11 2019-11-12 南京邮电大学 A kind of component carrier selection method of WiFi carrier aggregation technology
CN111935826A (en) * 2020-06-23 2020-11-13 东南大学 Fairness-oriented unlicensed frequency band NR-U and WiFi coexisting network carrier selection method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9924372B2 (en) * 2016-02-10 2018-03-20 Northeastern University Method for sharing of unlicensed radio frequency bands by cellular LTE and WiFi networks

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9999052B1 (en) * 2015-09-02 2018-06-12 Sprint Spectrum L.P. Selecting primary and secondary component carrier for carrier aggregation based on carrier group delay variation, insertion loss, and other carrier attributes
CN106332094A (en) * 2016-09-19 2017-01-11 重庆邮电大学 Coexistence Method of Dynamic Duty Cycle Based on Q Algorithm for Unlicensed Band LTE-U and WiFi System
CN109756920A (en) * 2017-11-03 2019-05-14 北京佰才邦技术有限公司 A kind of data transmission method, terminal and the network equipment
CN110446266A (en) * 2019-09-11 2019-11-12 南京邮电大学 A kind of component carrier selection method of WiFi carrier aggregation technology
CN111935826A (en) * 2020-06-23 2020-11-13 东南大学 Fairness-oriented unlicensed frequency band NR-U and WiFi coexisting network carrier selection method

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Chu liangyu等.U-CCS: an Unlicensed Component Carrier Selection Algorithm for Carrier Aggregation in LTE-U and WiFi Coexistence Networks.《IEEE》.2018, *
储良煜.非授权频段LTE-U与WiFi共存网络信道接入及载波选择机制研究.《万方数据》.2020, *
王鑫芯.LTE-U与WiFi的共存方法性能研究.《现代信息科技》.2018,(第07期), *

Also Published As

Publication number Publication date
CN113613180A (en) 2021-11-05

Similar Documents

Publication Publication Date Title
CN102215593B (en) An Improved LTE Scheduling Method Based on Proportional Fairness
CN103067985B (en) The binding of ultrahigh speed wireless lan channel and distribution method based on channel quality
CN102098746B (en) Multi-cell resource allocation method introducing mobile resource reserve mechanism
EP3322242A1 (en) Method and device for transmission instruction, transmission triggering and transmission implementation for multi-station
JP7092897B2 (en) Time-frequency resource allocation method and equipment
CN107154840B (en) Resource allocation control method, device and system
US20230328824A1 (en) Dual connectivity and carrier aggregation band selection
CN108541068B (en) Contention-based resource allocation
CN113747589B (en) Data transmission method, device and system, and computer readable storage medium
CN102333348B (en) Network switching side control method for terminal group access network based on cognitive radio
CN113613180B (en) A throughput requirement-oriented component carrier selection method for LTE-U system
CN108471608B (en) A D2D communication resource scheduling method and device
CN109041241A (en) SR resource allocation methods and device
US12082182B2 (en) Dynamic resource allocation method for coexistence of radio technologies
CN108235439A (en) Wireless communications method, apparatus and system
CN107426822B (en) An overhead-free resource reallocation method in wireless networks
CN102256366B (en) Multi-user multiple input multiple output (MIMO) resource scheduling method under carrier aggregation scene
CN112996114B (en) Resource scheduling method, device, equipment and storage medium
US11528736B2 (en) Systems and methods for coordinated access point scheduling
KR102012360B1 (en) Load balancing method and apparatus for communication system with carrier aggregation technology
CN113613321B (en) LTE-U system carrier power distribution method facing throughput demand
CN105744605B (en) A kind of resource allocation methods based on minimum power
CN107852695B (en) A method and apparatus for determining the subframe configuration of a cell cluster
Lin et al. A UE-grouping based load balancing scheme for Carrier Aggregation in LTE-advanced systems
Fu et al. A resource scheduling scheme for spectrum aggregation in cognitive radio based heterogeneous networks

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant