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CN109168146B - MTC transmission method supporting hybrid licensed-unlicensed frequency bands - Google Patents

MTC transmission method supporting hybrid licensed-unlicensed frequency bands Download PDF

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CN109168146B
CN109168146B CN201811402784.5A CN201811402784A CN109168146B CN 109168146 B CN109168146 B CN 109168146B CN 201811402784 A CN201811402784 A CN 201811402784A CN 109168146 B CN109168146 B CN 109168146B
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CN109168146A (en
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祁楚涵
张锐
李勇朝
严蕾
阮玉晗
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Xidian University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0289—Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
    • 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

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Abstract

The invention discloses a Machine Type Communication (MTC) transmission method supporting a hybrid authorized-unauthorized frequency band, which mainly solves the problems of network congestion caused by access of a large number of users to an authorized frequency band and the problems of high power consumption and short survival time of cluster head users in the prior art. The method comprises the following specific steps: (1) the base station sequences the users; (2) the base station selects an orthogonal-multiplexing mode and an allocation channel for the user; (3) the base station selects a multiplexing-unauthorized mode and an allocation channel for a user; (4) and uploading the user data. The invention can increase the number of the access users, improve the frequency utilization rate, reduce the power consumption of the users and increase the survival time of the users.

Description

MTC transmission method supporting hybrid licensed-unlicensed frequency bands
Technical Field
The invention belongs to the technical field of communication, and further relates to a Machine Type Communication (MTC) (machine Type communication) transmission method supporting a hybrid authorized-unauthorized frequency band in the technical field of machine Type communication. The invention can be used for uploading user data in machine type communication.
Background
Machine type communication MTC is based on intelligent machine type terminals, and provides a communication technology of informatization solutions such as data acquisition, data measurement, monitoring and alarming for clients in various communication modes, and under the dual drive of technical change and application requirements, application forms such as infrared sensing, radio frequency identification, remote control, intelligent home furnishing, positioning and tracking and the like are widely applied to daily life of people, so that not only are a great deal of convenience brought to the life of common people, but also the industrial production efficiency is improved, and the industrial production cost is reduced. People expect more abundant and wider applications while enjoying the high efficiency and various conveniences brought by machine type communication MTC.
The cellular network has the advantages of wide coverage, low service deployment cost, high reliability, backward expansion support and the like, and can ensure the rapid and efficient transmission of data of the terminal equipment. However, MTC users in machine-type communication are widely distributed and numerous, quality of service (qos) requirements are diverse, and uploading of massive user data at the same time may occupy scarce frequency band resources, which may cause network congestion. The MTC transmission method is an important technology for uploading user data, reasonable configuration of resources is achieved through means of power control, channel allocation, mode selection and the like, user power consumption is reduced, the number of access users is increased, and data uploading time is reduced. The existing Machine Type Communication (MTC) transmission method comprises the following steps:
mosafa proposed a transmission class communication MTC transmission method based on transmission classes in cellular networks in its published paper "a static priority-based scheduling for M2M communications in LTE networks" (IEEE Access, vol.5, pp.8106-8117,2017). The method firstly analyzes the requirements of different user data uploading on time delay, accuracy and priority, designs a transmission grade expression, and then sequentially distributes channels for each user according to the transmission grade. The method considers the characteristics of user data, and adopts a mode of grade division to relieve the congestion problem when the user data is uploaded at the same time, however, the method still has the defects that a large number of access users occupy scarce authorized frequency band resources in the method, and network congestion is caused.
In the patent of Beijing postal and electronic university, "MTC equipment data transmission method and system based on cluster compression-application publication" (patent application No. 201710424421.0, publication No. 107124693A), a machine type communication MTC transmission method based on cluster compression and data compression is proposed. The method comprises the steps of firstly, clustering and dividing all users and selecting cluster head users, then, summarizing and compressing the data of members in a cluster by utilizing the cluster head users, and uploading the summarized and compressed data to a base station. The method increases the user access number by clustering, reduces redundancy through data compression and effectively solves the congestion problem, but the method still has the defects of high power consumption and short survival time of cluster head users.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an MTC transmission method supporting a hybrid licensed-unlicensed frequency band. The invention can increase the number of access users, improve the frequency utilization rate, reduce the power consumption of the users and increase the survival time of the users.
The invention is realized by the idea that the carrying type and the transmission grade reflect the difference of different users in QoS requirements, the base station sorts all users carrying the same type according to the transmission grade, and selects different communication modes to upload data for all users carrying the same type as alarm according to whether the idle cellular channel exists or not; selecting different communication modes to upload data for all users with mobile media carrying types according to whether non-idle cellular channels exist or not; and when the WiFi frequency band is idle, the users carrying the conventional monitoring type upload data by using the WiFi frequency band.
The method comprises the following specific steps:
(1) the base station sequences the users:
according to the user carrying type and the transmission grade, the base station sequences all users with the same carrying type from high to low according to the transmission grade;
(2) the base station allocates channels for the alarm users:
(2a) when an idle cellular channel exists, users with high transmission levels and alarm carrying types are communicated in an orthogonal mode, and a base station distributes the idle cellular channel for the users in sequence according to the sequence of the transmission levels of the users by using random matching as a principle until no idle cellular channel can be distributed;
(2b) the users which do not obtain the carrying type of the idle cellular channel as the alarm communicate in a multiplexing mode, and the base station selects non-idle cellular channels in sequence according to the sequence of the transmission grades of the users by using the minimum interference matching as a principle until all the users which carry the type as the alarm have channels;
(3) the base station allocates channels for mobile media users and regular monitoring users:
(3a) when non-idle cellular channels exist, users with high transmission levels and carrying mobile media communicate in a multiplexing mode, and a base station selects the non-idle cellular channels in sequence according to the sequence of the transmission levels of the users by using minimum interference matching as a principle until the non-idle cellular channels are not allocable;
(3b) the users which do not obtain the non-idle cellular channel and are carried with the mobile media type communicate in an unauthorized mode, a base station divides a WiFi frequency band into a plurality of sub-channels with the same frequency bandwidth, the number of the sub-channels is the same as that of the users which carry the non-allocated channel with the mobile media type, and the base station allocates the sub-channels for the users which carry the non-allocated channel with the mobile media type by using a random matching principle;
(3c) all users with the carrying type of conventional monitoring communicate in an unauthorized mode, and when the WiFi frequency band is idle, the base station sequentially allocates the WiFi frequency band to the users with the carrying type of conventional monitoring according to the sequence of the transmission grades of the users;
(4) uploading user data:
(4a) according to the mode selection and channel allocation result of the base station, uploading respective data by all users carrying the alarm type and all users carrying the mobile media type respectively;
(4b) and carrying user uploading data with the type of conventional monitoring when the WiFi frequency band is idle.
Compared with the prior art, the invention has the following advantages:
firstly, the invention uses the carrying type of the non-idle cellular channel which is not obtained as the user of the mobile medium to communicate in the non-authorized mode, thereby overcoming the problem of network congestion caused by that a large number of access users occupy the scarce authorized frequency band resource in the prior art, and leading the invention to have the advantages of more access users and high frequency utilization rate.
Secondly, according to the mode selection and channel allocation results of the base station, for all users carrying the alarm type, different communication modes are selected to upload data according to whether an idle cellular channel exists or not; and for all users with mobile media carrying types, selecting different communication modes to upload data according to whether non-idle cellular channels exist, and overcoming the problems of high power consumption and short survival time of cluster head users in the prior art, so that the invention has the advantages of low power consumption of users and long standby time.
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FIG. 1 is a flow chart of the present invention.
Detailed Description
The specific steps of the present invention will be further described with reference to fig. 1.
Step 1, the base station sequences the users.
And according to the user carrying type and the transmission grade, the base station sorts all users with the same carrying type according to the transmission grade from high to low.
The carrying type refers to 3 information types of alarm, mobile media and conventional monitoring carried when a user initiates a request to a base station.
The transmission grade is obtained by the following calculation formula:
Figure GDA0002330289550000041
wherein cl represents a user transmission level, S represents an uploaded data amount of a user, x represents a multiplication operation, p represents the lowest accuracy of the uploaded data, and omega represents the tolerance time of the uploaded data.
Step 2, the base station allocates channels for the alarm users:
when the idle cellular channel exists, the users with the carrying type of alarm and high transmission level communicate in an orthogonal mode, and the base station distributes the idle cellular channel for the users in turn according to the sequence of the transmission level of the users by using the random matching as a principle until no idle cellular channel can be distributed.
The random matching means that one channel is randomly selected from all idle cellular channels and allocated to a user.
The users which do not obtain the idle cellular channel and are carried with the type as the alarm are communicated in a multiplexing mode, and the base station selects non-idle cellular channels in sequence according to the sequence of the transmission grades of the users by using the minimum interference matching as a principle until all the users with the type as the alarm have the channel.
The minimum interference matching refers to selecting one channel with minimum interference to the user from all non-idle cellular channels to be allocated to the user.
Step 3, the base station distributes channels for the mobile media users and the conventional monitoring users:
when non-idle cellular channels exist, users with high transmission levels carrying mobile media communicate in a multiplexing mode, and a base station selects the non-idle cellular channels in sequence according to the sequence of the transmission levels of the users by using minimum interference matching as a principle until no non-idle cellular channels can be allocated.
The users which do not obtain the non-idle cellular channel and are carried with the mobile media are communicated in an unauthorized mode, a base station divides a WiFi frequency band into a plurality of sub-channels with the same frequency bandwidth, the number of the sub-channels is the same as that of the users which are carried with the mobile media and are not distributed with the channels, and the base station distributes the sub-channels for the users which are carried with the mobile media and are not distributed with the channels by the principle of random matching.
All users with the carrying type of conventional monitoring communicate in an unauthorized mode, and when the WiFi frequency band is idle, the base station sequentially allocates the WiFi frequency band to the users with the carrying type of conventional monitoring according to the sequence of the transmission grades of the users.
And 4, uploading user data:
and according to the mode selection and channel allocation result of the base station, uploading respective data by all users carrying the alarm type and all users carrying the mobile media type respectively.
And carrying user uploading data with the type of conventional monitoring when the WiFi frequency band is idle.
The invention is further described below with reference to two examples.
In embodiment 1 of the present invention, the number of all users carrying a type of alarm is greater than the number of all idle cellular channels and less than the number of all idle cellular channels and non-idle cellular channels, and the number of all users carrying a type of mobile media and carrying a type of alarm is greater than the number of all idle cellular channels and non-idle cellular channels.
The concrete steps of the embodiment 1 of the invention are as follows:
step 1, the base station sorts the users.
The base station sorts and numbers all users with the same carrying type according to the transmission level to obtain three user sets, wherein the carrying type is the user set gamma of alarm1User set gamma with mobile media carrying type2User set gamma with conventional monitoring carried type3The number of users in the three user sets is T respectively1、T2、T3。
And step 2, the base station allocates channels for the alarm users.
User set gamma with alarm as carrying type1Middle number j1In [1, S ]1]In an orthogonal mode, wherein S1The number of idle cellular channels is represented, and the base station takes the random matching as the principle according to the number j1And allocating idle cellular channels for the users in turn.
User set gamma with alarm as carrying type1Middle number j1In [ S ]1+1,T1]The users between the base stations communicate in a multiplexing mode, and the base station takes the minimum interference matching as a principle according to the number j1The users are in turn assigned non-idle cellular channels.
And 3, the base station allocates channels for the mobile media users and the regular monitoring users.
User set gamma carrying mobile media type2Middle number j2In [1, S ]1+S2-T1]The base station takes the minimum interference matching as the principle according to the number j2Allocating channels to users in turn, wherein S2Indicating the number of non-idle cellular channels.
User set gamma carrying mobile media type2Middle number j2In [ S ]1+S2-T1+1,T2]The user of (2) communicates in an unlicensed mode, and the unlicensed frequency band is divided into T2+T-S1-S2The base station distributes the sub-channels by using the principle of random matching.
User set gamma with conventional monitoring type3When the WiFi frequency band is idle, the base station distributes the WiFi frequency band to users carrying users with conventional monitoring types in sequence according to the sequence of the transmission levels of the users.
And 4, uploading user data.
User set gamma with alarm as carrying type1And carrying a set of users of type mobile media Γ2And all the users upload respective data respectively.
User set gamma of mobile media type to be carried2All the users in the system finish uploading and carry a user set gamma with the type of conventional monitoring3And the user uploads data by using the WiFi frequency band in sequence according to the transmission grade.
In embodiment 2 of the present invention, the number of all users carrying a type of alarm is smaller than the number of all idle cellular channels, and the number of all users carrying a type of mobile media is smaller than the number of all non-idle cellular channels.
The embodiment 2 of the invention comprises the following specific steps:
step 1, the base station sorts the users.
The base station sorts all users carrying the same type according to transmission grade to obtain three user sets, wherein the user set gamma carrying the type of alarm is1User set gamma with mobile media carrying type2User set gamma with conventional monitoring carried type3。
And step 2, the base station selects an orthogonal mode and allocates channels for the alarm users.
User set gamma with alarm as carrying type1In which all users are in an orthogonal mode,and the base station distributes idle cellular channels for the users in sequence according to the sequence of the transmission grades of the users by using random matching as a principle.
And 3, the base station allocates channels for the mobile media users and the regular monitoring users.
User set gamma carrying mobile media type2All the users are in a multiplexing mode, and the base station distributes channels for each user in turn according to the sequence of the transmission grades of the users by using the minimum interference matching as a principle.
User set gamma with conventional monitoring type3And the base station sequentially allocates the WiFi frequency bands to the users according to the sequence of the transmission grades of the users when all the users are in the unauthorized mode.
And 4, uploading user data.
User set gamma with alarm as carrying type1And carrying a set of users of type mobile media Γ2All users in the system use the cellular frequency band to upload data,
user set gamma with conventional monitoring type3And the user uploads data by using the WiFi frequency band in sequence according to the transmission grade.

Claims (5)

1.一种支持混合授权-非授权频段的机器类通信MTC传输方法，其特征在于，根据基站的模式选择和信道分配结果，对携带类型为报警的所有用户，根据是否存在空闲蜂窝信道选择不同的通信模式上传数据；对携带类型为移动媒体的所有用户，根据是否存在非空闲蜂窝信道选择不同的通信模式上传数据；待WiFi频段空闲，携带类型为常规监测的用户使用WiFi频段上传数据；该方法的步骤包括如下：1. a kind of machine type communication MTC transmission method that supports mixed authorization-unlicensed frequency band, it is characterized in that, according to the mode selection of base station and channel allocation result, to all users that carry type is an alarm, according to whether there is idle cellular channel selection different For all users whose carrying type is mobile media, select different communication modes to upload data according to whether there is a non-idle cellular channel; when the WiFi frequency band is free, users whose carrying type is regular monitoring use the WiFi frequency band to upload data; the The steps of the method include the following: (1)基站对用户进行排序：(1) The base station sorts the users: 根据用户携带类型和传输等级，基站对相同携带类型的所有用户按传输等级由高到低的顺序进行排序；According to the user's carrying type and transmission level, the base station sorts all users of the same carrying type in descending order of transmission level; (2)基站为报警用户分配信道：(2) The base station allocates channels for alarm users: (2a)当存在有空闲蜂窝信道时，携带类型为报警的传输等级高的用户以正交模式通信，基站以随机匹配为原则，根据用户的传输等级的排序依次为用户分配空闲蜂窝信道，直到没有空闲蜂窝信道可分配；(2a) When there are idle cellular channels, users with high transmission levels carrying the alarm type communicate in an orthogonal mode. The base station follows the principle of random matching and assigns idle cellular channels to users in turn according to the order of the transmission levels of the users. no free cellular channels to assign; (2b)未获得空闲蜂窝信道的携带类型为报警的用户，以复用模式通信，基站以最小干扰匹配为原则，根据用户的传输等级的排序，依次选取非空闲蜂窝信道，直到携带类型为报警的所有用户均有信道；(2b) Users who have not obtained idle cellular channels whose carrying type is alarm, communicate in a multiplexing mode, and the base station selects non-idle cellular channels in turn according to the order of the user's transmission level according to the principle of minimum interference matching, until the carrying type is alarm. All users of the channel have channels; (3)基站为移动媒体用户和常规监测用户分配信道：(3) The base station allocates channels for mobile media users and regular monitoring users: (3a)当存在有非空闲蜂窝信道时，携带类型为移动媒体的传输等级高的用户以复用模式通信，基站以最小干扰匹配为原则，根据用户的传输等级的排序，依次选取非空闲蜂窝信道，直到没有非空闲蜂窝信道可分配；(3a) When there is a non-idle cellular channel, users with a high transmission level carrying the type of mobile media communicate in a multiplexing mode, and the base station selects non-idle cells in turn based on the principle of minimum interference matching, according to the sorting of the transmission levels of the users channels until there are no non-idle cellular channels to allocate; (3b)未获得非空闲蜂窝信道的携带类型为移动媒体的用户，以非授权模式通信，基站将WiFi频段划分为多个频带宽度相同的子信道，子信道数目与携带类型为移动媒体的还未分配信道的用户数目相同，基站以随机匹配为原则为携带类型为移动媒体的还未分配信道的用户分配子信道；(3b) A user who has not obtained a non-idle cellular channel and whose carrying type is mobile media communicates in an unlicensed mode. The base station divides the WiFi frequency band into multiple sub-channels with the same frequency bandwidth. The number of users with unallocated channels is the same, and the base station allocates sub-channels to users whose carrying type is mobile media and has not been allocated channels based on the principle of random matching; (3c)携带类型为常规监测的所有用户以非授权模式通信，当WiFi频段空闲时，基站根据用户的传输等级的排序，将WiFi频段依次分配给携带类型为常规监测的用户；(3c) All users whose carrying type is conventional monitoring communicate in unlicensed mode. When the WiFi frequency band is idle, the base station assigns the WiFi frequency band to users whose carrying type is conventional monitoring in turn according to the sorting of the user's transmission level; (4)上传用户数据：(4) Upload user data: (4a)根据基站的模式选择和信道分配结果，携带类型为报警的所有用户和携带类型为移动媒体的所有用户分别上传各自的数据；(4a) according to the mode selection and channel allocation result of the base station, all users whose carrying type is an alarm and all users whose carrying type is mobile media upload their respective data; (4b)待WiFi频段空闲，携带类型为常规监测的用户上传数据。(4b) When the WiFi frequency band is free and the carrying type is the user uploading data of conventional monitoring. 2.根据权利要求1所述的支持混合授权-非授权频段的机器类通信MTC传输方法，步骤(1)中所述的携带类型是指，用户向基站发起请求时携带的报警、移动媒体、常规监测3种信息类型。2. the machine type communication MTC transmission method of supporting mixed authorization-unlicensed frequency band according to claim 1, the carrying type described in the step (1) refers to, the alarm that the user carries when initiating a request to the base station, mobile media, Three types of information are routinely monitored. 3.根据权利要求1所述的支持混合授权-非授权频段的机器类通信MTC传输方法，步骤(1)中所述的传输等级是由如下计算公式得到的：3. the MTC transmission method of supporting hybrid authorization-unlicensed frequency band according to claim 1, the transmission level described in step (1) is obtained by following formula:
Figure FDA0002330289540000021
Figure FDA0002330289540000021
 其中，cl表示用户传输等级，S表示用户的上传数据量，*表示相乘操作，p表示上传数据的最低准确率，ω表示上传数据的容忍时间。Among them, cl represents the user's transmission level, S represents the amount of data uploaded by the user, * represents the multiplication operation, p represents the minimum accuracy rate of the uploaded data, and ω represents the tolerance time of the uploaded data. 4.根据权利要求1所述的支持混合授权-非授权频段的机器类通信MTC传输方法，步骤(2a)中所述的随机匹配是指，从所有空闲蜂窝信道中随机选取一个信道分配给用户。4. The machine type communication MTC transmission method of supporting mixed authorization-unlicensed frequency bands according to claim 1, the random matching described in step (2a) refers to, randomly select a channel from all idle cellular channels and assign it to the user . 5.根据权利要求1所述的支持混合授权-非授权频段的机器类通信MTC传输方法，步骤(2b)中所述的最小干扰匹配是指，从所有非空闲蜂窝信道中选取用户所受干扰最小的一个信道分配给用户。5. The MTC transmission method for supporting hybrid licensed-unlicensed frequency bands according to claim 1, wherein the minimum interference matching described in step (2b) refers to selecting the interference suffered by users from all non-idle cellular channels The smallest channel is assigned to the user.
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