CN107580340B - Resource scheduling method in V2X network - Google Patents
Resource scheduling method in V2X network Download PDFInfo
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Abstract
The application discloses a resource scheduling method in a V2X network, which comprises the following steps: different QCI levels are preset for the V2X service; a network side acquires a QCI (quaternary clock identifier) grade of a current service to be scheduled; for all services to be scheduled, determining the absolute priority and the relative priority of the corresponding services according to QCI (quaternary Committee identifier) levels in QoS (quality of service) parameters of the services; and according to the absolute priority and the relative priority of each service, performing priority sequencing on all the services to be scheduled, and sequentially allocating resources to the services with data in the buffer area according to the sequencing result. By applying the method and the device, detailed priority division can be performed on the V2X service, and the priority requirement of the V2X service is guaranteed.
Description
Technical Field
The present application relates to V2X technology in a communication system, and in particular, to a resource scheduling method in a V2X network.
Background
V2X (Vehicle to X), namely information exchange between a Vehicle and the outside, is a key technology of a future intelligent transportation system. V2X was approved at 3GPP RAN #68 conference, mainly studying vehicle data transmission schemes based on 3GPP communication protocols. Currently in the existing report, V2X applications include Vehicle-to-Vehicle V2V (Vehicle-to-Vehicle), Vehicle-to-roadside Infrastructure V2I (Vehicle-to-Infrastructure), Vehicle-to-Pedestrian V2P (Vehicle-to-Pedestrian), and Vehicle-to-application server V2N (Vehicle-to-Network), as shown in fig. 1. The application of V2X will improve driving safety, reduce congestion and vehicle energy consumption, improve traffic efficiency and vehicle-mounted entertainment information, etc.
The basic message types of V2X are divided into CAM messages and DENM messages. The CAM message is used for providing basic state information of the ITS terminal such as position, speed, acceleration, direction and the like of the ITS terminal to a neighbor ITS terminal in a single-hop communication range, and is suitable for scenes such as front vehicle warning, motorcycle approach indication and the like. After all VDC nodes are activated, CAM messages are sent out substantially periodically. The DENM message is used for notifying the occurrence of a specific event, when the defined specific event occurs, the corresponding DENM message is triggered, and before the event is cancelled, the corresponding DENM message is periodically sent outwards, so that the method and the device are suitable for scenes such as emergency electronic brake lamp warning, reverse overtaking prompt and the like.
Most of the V2X traffic has the feature of periodic broadcast. If the eNode B can know the periodic interval or message frequency of the V2X message of the UE, the eNode B can allocate more reasonable resources to the UE by adopting a proper scheduling manner according to the service period attribute of the UE. In addition, V2X traffic has requirements of low latency, high reliability, high mobility, etc. Since the requirements of users in the automotive industry on real-time processing of services are significantly higher than those of users in general communication, consideration needs to be given to how to guarantee the quality of service for different users. Meanwhile, for the base station device and different terminal devices in the V2X network to carry multiple types of services, not only the maximization of system throughput and capacity needs to be considered, but also the priority and reliable processing of the high-priority request needs to be ensured.
The scheduling algorithm commonly used in the LTE system can be mainly classified as: round Robin (RR) algorithm, Max carrier-to-interference ratio (Max C/I) algorithm, Proportional Fair (PF) algorithm.
1. Polling algorithm
Round-robin algorithm generally takes round-robin scheduling algorithm as a measure when considering fairness among users. The algorithm has no specific priority ordering method, and each user is scheduled circularly, namely, the probability that each user occupies service resources is the same in terms of scheduling probability. When the polling algorithm is used for scheduling, the former served situation of the user is not considered, namely a memoryless mode, which is the same as the maximum carrier-to-interference ratio algorithm. The round-robin algorithm is the most fair algorithm, but the resource utilization rate of the algorithm is not high, because some users get services with equal probability even when the channel condition is very bad, and therefore the throughput of the system may be low.
2. Maximum carrier-to-interference ratio algorithm
The maximum carrier-to-interference ratio algorithm is that when the scheduled user is selected, only the user with the maximum carrier-to-interference ratio is selected, that is, the user with the best channel condition occupies the resource to transmit data, and when the channel of the user is deteriorated, the user with the best channel condition is selected. The priority ranking of the algorithm is based on the quality of the user channel, and the base station always serves the user with the best channel condition at the current time. The throughput obtained by the maximum carrier-to-interference ratio algorithm is a limit value of the throughput, but in a mobile communication system, users are located at different positions and have different received signal strengths, the maximum carrier-to-interference ratio algorithm only takes care of users close to the base station and having good channel conditions, and other users far away from the base station cannot obtain corresponding services, so that the service coverage of the base station is very small. The maximum carrier-to-interference ratio scheduling algorithm guarantees the maximum throughput of the cell, but does not consider the fairness among users.
3. Proportional fairness algorithm
The priority ranking of the proportional fairness algorithm is comprehensively considered according to the channel quality of the users and the throughput obtained in the past period of time, a certain compromise can be obtained between the system throughput and the user fairness, and the proportional fairness algorithm is a more algorithm adopted at present.
When the three algorithms described above are applied in an actual system, certain modifications are generally made, for example, factors such as QoS requirements (delay and throughput requirements) of services are taken into consideration.
The V2X service with low time delay and high reliability has a transmission scene based on a Uu port. Since the base station device and the terminal device need to carry multiple types of V2X services and LTE broadband access services, not only the maximization of system throughput and capacity needs to be considered, but also the QoS requirements of the services, especially the quality of service of high-class services (such as security class V2X services), need to be satisfied as much as possible. For users in the automobile industry, the requirement on the real-time processing of the V2X service is significantly higher than that of the LTE broadband access service, and the CAM message has a periodic characteristic, and a perfect priority service policy and resource allocation policy need to be established, different priority service levels are set, priority allocation and priority communication of high-priority service resources are ensured, and system performance is improved, so that it is very important to research a scheduling method in the V2X network. If the V2X network directly uses the priority ranking policy of the above three common scheduling algorithms, it may not be ensured that the important communication service in the system obtains communication resources preferentially, and the important communication information may not be transmitted immediately when the load is heavy, and it may not be ensured that the important service in the network is provided with service.
Disclosure of Invention
The application provides a resource scheduling method in a V2X network, which can perform detailed priority division aiming at a V2X service and ensure the priority requirement of the V2X service.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a resource scheduling method in a V2X network comprises the following steps:
different QCI levels are preset for the V2X service;
a network side acquires a QCI (quaternary clock identifier) grade of a current service to be scheduled;
determining the absolute priority and the relative priority of the corresponding service according to the QCI grades of the services for all the services to be scheduled;
and according to the absolute priority and the relative priority of each service, performing priority sequencing on all the services to be scheduled, and sequentially allocating resources to the services with data in the buffer area according to the sequencing result.
Preferably, the QCI level is set according to application scenarios, latency and/or reliability of different V2X services, or according to application types and/or service urgency of different V2X services.
Preferably, QCI levels corresponding one-to-one to service characteristics thereof are set for the security V2X service, non-security basic V2X service, information service V2X service, and entertainment information V2X service.
Preferably, the absolute priority of the corresponding service is determined according to the QoS parameter, the satisfaction degree, the QCI level of the service to be scheduled, and the interference situation of the user to which the service belongs in the cell.
Preferably, the absolute priority of the service is in the order from high to low: CCCH traffic, DCCH traffic, Safety V2X traffic, non-Safety basic V2X traffic, QCI 5 traffic, information service V2X traffic, SPS retransmission traffic, DS retransmission traffic, MAC control element traffic, edge user dissatisfied GBR traffic, center user dissatisfied GBR traffic, edge user dissatisfied non-GBR traffic, center user dissatisfied non-GBR traffic, edge user satisfied GBR traffic, center user satisfied GBR traffic, edge user satisfied non-GBR traffic, and center user satisfied non-GBR traffic.
Preferably, the relative priority is determined according to service satisfaction, QCI level, and channel quality of the user.
Preferably, in the process of requesting bearer resource allocation by the UE, the UE and the network side interact with the QCI level of the current V2X service.
Preferably, the UE carries the QCI level of the service on a requiredtrafffic QoS cell in a BEARER RESOURCE ALLOCATION REQUEST message; and/or the presence of a gas in the gas,
the network side carries the QCI level of the service on the EPSQoS cell in the ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST message or on the New EPS QoS cell in the MODIFY EPS BEARER CONTEXT REQUEST message.
Preferably, the QCI level is included in QoS parameters;
for the periodically transmitted V2X traffic, the QoS parameters further include a period parameter for indicating that the corresponding V2X traffic is periodically transmitted;
the method further comprises the following steps: and performing semi-persistent SPS scheduling on the corresponding V2X service according to the periodic parameter.
Preferably, when the periodically transmitted V2X traffic is a fixed period, the period parameter is a period interval value of the V2X traffic;
the performing SPS scheduling according to the periodic parameter comprises: and taking the periodic interval value as the periodic interval of SPS scheduling.
Preferably, when the periodically transmitted V2X traffic is a variable period, the period parameter is information indicating that the period is variable;
the performing SPS scheduling according to the periodic parameter comprises: determining the service type of the V2X service according to the QCI grade of the service, configuring Sidelink SPS configuration with a plurality of periodic intervals corresponding to the service type for the UE, and activating Sidelink SPS resources corresponding to the current periodic intervals when current periodic interval information reported by the UE is received and the service has data to be transmitted; or, determining the service type of the V2X service according to the QCI level of the service, determining the sildelink SPS configurations of a plurality of periodic intervals according to the service type, after receiving current periodic interval information reported by the UE, selecting the sildelink SPS configuration corresponding to the current periodic interval information from the determined plurality of sildelink SPS configurations to configure to the UE, and activating the configured sildelink SPS resources when data to be transmitted exists in the corresponding service.
According to the technical scheme, different QCI levels are preset for the V2X service; a network side acquires a QCI (quaternary clock identifier) grade of a current service to be scheduled; determining the absolute priority and the relative priority of the corresponding service according to the QCI grades of the services for all the services to be scheduled; and according to the absolute priority and the relative priority of each service, performing priority sequencing on all the services to be scheduled, and sequentially allocating resources to the services with data in the buffer area according to the sequencing result. Through the mode, on one hand, the detailed division of the priority of the V2X service is carried out through different QCI levels set corresponding to the V2X service, and on the other hand, the detailed division is carried out by referring to the QCI levels when the resource scheduling is carried out, so that different priority requirements of the V2X service are guaranteed to be scheduled.
Drawings
FIG. 1 is a schematic representation of the type of application of V2X (V2V, V2P, V2N and V2I);
FIG. 2 is a basic flowchart of a scheduling method in the present application
FIG. 3 is a diagram illustrating a process of a UE requesting bearer resource allocation;
fig. 4 is a diagram illustrating an E-RAB establishment procedure (success procedure);
fig. 5 is a schematic diagram of the priority factor formation.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
Fig. 2 is a basic flowchart of a resource scheduling method in the present application. As shown in fig. 1, the method includes:
step 101, presetting different QCI levels for V2X service.
LTE broadband access traffic and V2X traffic exist in a V2X network. In order to more finely divide the priority of the V2X service and distinguish the service from the existing LTE broadband access service, in the present application, in combination with the characteristics and requirements of the V2X service, the QCI level and the period parameter corresponding to the V2X service are newly added on the basis of the original QoS parameter, and the network side can better allocate resources according to the QoS attributes (such as service priority and period interval) of different services. The new QCI level is introduced in the application for explaining service characteristics and requirements of the V2X service.
Specifically, the new QCI level is added on the basis of the original QCI level, different QCI levels can be classified according to the service characteristics of V2X, and the priority levels of the services can be specified by using the priorities embodied in the QCI levels. For example, the newly added QCI level for implementing the fine division of the V2X priority may be divided by combining the requirements of different V2X services in different application scenarios and their corresponding time delays, reliability, and the like. Alternatively, the newly added QCI level may be divided according to the V2X application type.
Considering that most of the V2X services have the feature of periodic broadcast, a period parameter may be added to the QoS parameter, and the period parameter is used as an optional parameter, and when the V2X service has periodicity, the QoS parameter of the service carries the period parameter.
For ease of understanding, the new QCI level will be described in detail below. For the newly added QCI level, the new QCI level and the requirements of the new QCI level on the delay, the reliability and the like corresponding to different application scenarios of different V2X services can be classified in combination, and the new QCI level and the requirements of the related parameters are defined. Specifically, the V2X service application scenarios can be divided into traffic safety (e.g., emergency brake warning, blind spot vehicle warning, intersection driving assistance, and safety function abnormality warning, etc.), driving efficiency (e.g., electronic toll collection, road traffic condition prompting, enhanced road navigation, signal timing, etc.), information service (vehicle remote diagnosis, traffic information service, interested service notification), and entertainment application (entertainment information download, life information). For this, the present invention adds QCI levels corresponding to the security V2X service, non-security basic V2X service (related to driving efficiency), information service V2X service, and entertainment information V2X service, as shown in table 1. Each newly added QCI is identified by a resource type (GBR or Non-GBR), a priority, a packet delay budget, a packet loss rate, a service instance, and the like. The UE can determine the corresponding QCI grade according to the characteristics and the requirements of the current V2X service, and carries the QCI grade in the QoS parameters to send the QoS parameters to the core network; the core network may determine characteristics and requirements of the V2X service according to the QCI levels, and send the corresponding QCI levels to the base station by carrying the QCI levels in the QoS parameters.
Combining the newly added QCI level and the period parameter in the QoS parameter, the scheduler of the eNB better processes the data packet sent in the bearer according to a certain scheduling policy, for example, the V2X service data packet with high priority may be scheduled before the service data packet with low priority, if the QoS parameter carries the period parameter, which indicates that the service has periodicity, the scheduler of the eNB may adopt a semi-persistent scheduling mode for the service to reduce the overhead of the PDCCH.
Further, for V2X traffic with periodicity, the periodicity may be fixed or may vary, and therefore, the QoS parameter carries periodicity parameter indicating whether the traffic has periodicity or not, and periodicity interval information, i.e. for periodic traffic with fixed periodicity intervals, the periodicity parameter indicates a specific periodicity value, and for periodic traffic with variable periodicity intervals, the periodicity parameter indicates that the periodicity is variable but does not indicate a specific periodicity value.
When the eNB schedules according to the period parameter in the QoS parameter, if the period parameter in the QoS parameter corresponding to the service is a configured specific period value, the eNB takes the specific period value as a period interval of semi-persistent scheduling; if the period parameter in the QoS parameter corresponding to the service indicates that the period is variable, the eNB may have the following two operation modes:
in the first mode, the eNB acquires the service instance of the service according to the QCI level in the QoS parameter corresponding to the service, that is, acquires the service type of the service, and the eNB may configure, according to the service type, a plurality of sildelink SPS configurations at periodic intervals for the UE, and when the UE reports current periodic interval information of the service to the eNB and the service has data to be transmitted, the eNB activates, according to the current periodic interval information, a sildelink SPS resource corresponding to a matched configuration periodic interval, and specifically may be activated by loading DCI through a PDCCH channel, although the service may adopt other activation modes.
And secondly, the eNB acquires the service instance of the service according to the QCI level in the QoS parameter corresponding to the service, namely acquires the service type of the service, the eNB determines Sidelink SPS configurations at a plurality of periodic intervals according to the service type, after the UE reports the current periodic interval information of the service to the eNB, the eNB selects the Sidelink SPS configuration corresponding to the current periodic interval from the plurality of the determined Sidelink SPS configurations and configures the selected configuration to the UE, when the service of the UE has data to be transmitted, the eNB activates the Sidelink SPS resource, and specifically, the service can be activated by carrying DCI through a PDCCH channel, and of course, other activation modes can be adopted for the service.
As can be seen from table 1, the Priority levels between the newly added V2X service and the services supported by the original LTE protocol and the Priority levels between the newly added V2X service can be defined by setting the Priority Level parameter value, and the smaller the value, the higher the Priority Level, the relative Priority levels between the services are reflected by the values in the table, but not limited to these values. In table 1, the white background portion is the original QCI level, and the gray background portion is the new QCI level.
TABLE 1 QCI grade schematic table
For newly added QCI levels, they may also be divided in conjunction with V2X applications, such as V2V, V2I, V2P, V2N, etc. It may also be divided in connection with V2X applications and service urgency, such as emergency V2V, non-emergency V2V, emergency V2I, non-emergency V2I, emergency V2P, non-emergency V2P, emergency V2N, non-emergency V2N, etc. Further, the specific corresponding QCI class characteristics may also be categorized into one class. In addition, classification and division can be further performed in combination with a V2X service use example, the V2X service use example includes a forward collision warning, an out-of-control warning, an emergency vehicle warning, a V2V emergency stop, a cooperative adaptive cruise control, a V2I emergency stop, a queuing warning, a road safety service, an automatic parking system, a wrong way driving warning, a perception warning before collision, a V2X road safety service through equipment, a turning speed warning and the like, and the service use examples can be classified and divided according to requirements in priority, time delay, reliability and the like, and new QCI levels and related parameter requirements are defined.
After a new QCI level is introduced, the corresponding QCI level can be determined according to the characteristics and requirements of the current V2X service, and since the QCI level is divided for the V2X service at the time of setting, the QCI level can reflect different characteristics and requirements of the V2X service, and the priority of the V2X service is divided more finely.
The UE reports the QoS parameters (including QCI levels) corresponding to the bearers to the network side through the NAS information, the network side takes the QoS parameters reported by the UE as reference, allocates an E-RAB for the UE and establishes a corresponding data radio bearer, and the QoS information is carried in the E-RAB establishment request information.
Specifically, the UE and the network side may request a bearer resource allocation procedure, a QCI level of an interactive service, and an optional period parameter through the UE. As shown in fig. 3, the Required traffic flow QoS cell in the BEARER RESOURCE ALLOCATION REQUEST message may be modified, and the QCI level and the optional period parameter are added to the cell, that is, the QCI level and the optional period parameter are added to the EPS quality of service cell corresponding to the cell, as shown in table 2-1. Similarly, the EPSQoS cells in the ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST message and the New EPS QoS cells in the modified EPS BEARER CONTEXT REQUEST message may be modified, and the QCI level and optional period parameters may be added to these cells, i.e., the QCI level and optional period parameters may be added to the EPS quality of service cells corresponding to these cells, as shown in tables 2-2 and 2-3.
TABLE 2-1 BEARER RESOURCE ALLOCATION REQUEST message
TABLE 2-2 ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST messages
TABLE 2-3 MODIFY EPS BEARER CONTEXT REQUEST message
In more detail, when modifying a Required traffic flow QoS cell/EPS QoS cell/New EPS QoS cell, i.e. an EPS quality of service cell (specifically table 9.9.4.3.1: EPS quality of service information in section 9.9.4.3 of protocol TS 24.301), some QCI values may be newly defined in the cell, and the values of the QCI values may use the reserved values of QCI, as shown in table 3, and QCI97-QCI101 are newly defined and are not limited as compared to the newly added part of the existing cell using bold display, and the newly defined QCI values are associated with the QCI levels in table 1, and the corresponding QCI levels are carried by the QCI values. A Transmission periodicity parameter is added to the EPSquality of service cell, and as shown in table 4 and table 2, for a service with periodicity, the IE will contain Transmission periodicity. For aperiodic traffic, Transmission periodicity should be ignored.
TABLE 3 EPS quality of service cell
TABLE 4 EPS quality of service cell
The above is a mode of interacting QCI level information between the UE and the network side. Preferably, for the periodic V2X traffic, periodic parameters of the periodic V2X traffic may also be interacted between the UE and the network side, so that the network side may perform semi-persistent scheduling on the periodic V2X traffic when performing scheduling.
Specifically, in the E-RAB establishment process, a Transmission periodicity Information cell can be added in the E-RAB Level QoS Parameters to carry periodic parameter Information of the periodic V2X service.
Preferably, fig. 4 shows the successful procedure of E-RAB establishment, unlike the E-RAB setup request message specified by the standard LTE protocol, in which a transmission periodicity Information element is added to the E-RAB Level QoS Parameters, and the Information element is used to indicate periodic Information with periodic traffic. Specifically, a Transmission permission Information cell is added To the E-RAB Level QoS Parameters in the E-RAB To Be SETUP lists in the E-RAB SETUP REQUEST message, as shown in tables 5 To 7. Thus, the periodicity attribute of the bearer can be judged according to whether a Transmission periodicity Information cell exists or not, if the Transmission periodicity Information cell exists, the service of the bearer is described to have periodicity, and the eNode B adopts a semi-persistent scheduling mode according to the periodicity Information during scheduling. As shown in fig. 4, the successful procedure of E-RAB establishment includes: MME sends E-RAB SETUP REQUEST message to eNB to trigger E-RAB establishment process; the eNB sends an E-RAB SETUP RESPONSE message to the MME.
TABLE 5E-RAB SETUP REQUEST message Format
TABLE 6E-RAB Level QoS parameters
TABLE 7 Transmission Periodicity Information cell structure
Also, considering the characteristics and requirements of V2X service, a QCI level associated with V2X service is newly defined in the QoS parameters for the eNode B to recognize that the procedure is to establish a bearer associated with V2X service, and a scheduling policy is considered in conjunction with the QoS parameters.
In this application, preferably, the service absolute priority is mainly determined according to the QoS requirement, the satisfaction degree, the QCI level of the service, and the interference situation of the user to which the service belongs in the cell, and specifically, the absolute priority of the service in the scheduling period and the priority ranking among the absolute priorities are determined. According to system requirements, services with different absolute priorities are divided, priority sequencing among the absolute priorities is specified, and absolute priority values of the services corresponding to the absolute priority services are set. Taking the V2X network as an example, several types of traffic with different absolute priorities are currently defined, and the absolute priorities are in order from high to low: CCCH traffic, DCCH traffic, Safety V2X traffic, non-Safety basic V2X traffic, QCI 5 traffic, information service V2X traffic, SPS retransmission traffic, DS retransmission traffic, MAC control element traffic, edge user dissatisfied GBR traffic, center user dissatisfied GBR traffic, edge user dissatisfied non-GBR traffic, center user dissatisfied non-GBR traffic, edge user satisfied GBR traffic, center user satisfied GBR traffic, edge user satisfied non-GBR traffic, and center user satisfied non-GBR traffic. And sets corresponding absolute priority values for these services.
In order to better meet the QoS requirements of different data services of users, the relative priority of the services is introduced. The relative priority is determined according to the service satisfaction, the QCI characteristics, and the channel quality situation of the user. And sorting 8 types of absolute priorities, namely, dissatisfied GBR service of edge users, dissatisfied GBR service of central users, dissatisfied non-GBR service of edge users, satisfied GBR service of central users, satisfied non-GBR service of edge users and satisfied non-GBR service of central users according to relative priorities under the same absolute priority. Except the 8 types of absolute priorities, other services are sorted according to first-in first-out (FIFO) under the same absolute priority.
The relative priority calculation formula is:
wherein: priority (i, t) is the relative priority of traffic for logical channel i at time t, Spectrumwide_band(i, t) is the normalized broadband transmission efficiency of the user to which the service of the logical channel i belongs at time t,and the service of the logical channel i corresponds to the normalization factor of the QCI grade. Sat (i, t) indicates the satisfaction of service i in sub-frame t, when Sat (i, t)<And 1, the service is the unsatisfactory service, otherwise, the service is the satisfactory service.
The GBR traffic and non-GBR traffic may use different formulas to calculate the satisfaction.
For GBR traffic, the satisfaction only needs to consider the GBR requirement, and the formula is as follows:
wherein:the effective data rate (bps) of the MAC layer for the logical channel of the time t service i,
for the smoothing factor, R (i, t) is the effective instantaneous rate of the MAC layer of the logical channel of service i at time t; rGBR(i) The GBR of the logical channel for service i is reflected in the effective data rate of the MAC layer.
For non-GBR service, the QoS requirement can be met only when the time delay does not exceed a certain threshold, and the satisfaction formula is as follows:
wherein: t _ delayiThe RLC end-to-end delay requirement translated by the PDB corresponding to the QCI class of service i. WT (i, t) is the waiting time of the first arriving data packet of service i until sub-frame t, and Timer _ threshold is the allowed delay threshold of non-GBR service in RLC layer. That is, when the waiting time of the first arrived packet of the non-GBR service is larger than T _ delayiAnd when the Timer _ threshold is reached, the non-GBRGBR service is considered to be unsatisfactory, otherwise, the non-GBRGBR service is considered to be satisfactory.
When the method is applied to an actual system, the relative priority calculation formula is subjected to fixed-point processing, which is related to specific implementation and is not described in detail in the application.
And step 204, performing priority sequencing on all the services to be scheduled according to the absolute priority and the relative priority of each service, and sequentially allocating resources to the services with data in the buffer area according to the sequencing result.
The priority factor can be calculated according to the absolute priority and the relative priority of each service, and then the priority of the services is sequenced according to the priority factor. The priority factor may be composed of a traffic absolute priority and a traffic relative priority. For the convenience of understanding, the priority factor is illustrated as 16 bits (as shown in fig. 5), but in practical application, the priority factor is not limited to 16 bits, and can be adjusted according to specific situations. For a priority factor of length 16 bits, the absolute priority of the traffic uses its high 8 bits, and the relative priority of the traffic uses its low 8 bits.
The service to be scheduled determines the absolute priority and the relative priority of the service according to the method, and forms a priority factor. And sequencing the priority factors of all the services to be scheduled in size, and sequentially allocating resource blocks to the services with data in the buffer area. And the resource allocation mode considers whether a semi-persistent scheduling mode is adopted to allocate the resources according to the period attribute information in the QoS parameters. If the service to be scheduled is a periodic service, that is, the QoS parameter corresponding to the service carries a periodic parameter, resources can be allocated to the service in a semi-persistent scheduling manner.
The resource scheduling method in the present application is ended. Through the above processing, a new QCI level is introduced, and the corresponding QCI level is determined according to the characteristics and requirements of the current V2X service, and since the QCI level is divided for the V2X service when being set, the QCI level can reflect different characteristics and requirements of the V2X service, and the priority of the V2X service is divided more finely. And when the resource scheduling is carried out, determining the absolute priority and the relative priority of the service according to the QCI grade, carrying out priority sequencing according to the absolute priority and the relative priority, and then carrying out resource allocation. Therefore, the V2X service can be differentiated in priority in the resource scheduling process, and the resource scheduling is carried out according to the priority.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for scheduling resources in a V2X network, comprising:
different QCI levels are preset for the V2X service; wherein the QCI class is included in QoS parameters;
a network side acquires a QCI (quaternary clock identifier) grade of a current service to be scheduled;
determining the absolute priority and the relative priority of the corresponding service according to the QCI grades of the services for all the services to be scheduled;
according to the absolute priority and the relative priority of each service, performing priority sequencing on all the services to be scheduled, and sequentially allocating resources to the services with data in a buffer area according to a sequencing result;
for the periodically transmitted V2X traffic, the QoS parameter further includes a period parameter, which is used to indicate that the corresponding V2X traffic is periodically transmitted; and performing semi-persistent SPS scheduling on the corresponding V2X service according to the periodic parameter.
2. The method of claim 1, wherein the QCI level is set according to application scenario, latency and/or reliability of different V2X traffic or according to application type and/or urgency of traffic of different V2X traffic.
3. The method of claim 1 or 2, wherein QCI levels one-to-one corresponding to service characteristics thereof are set for security V2X service, non-security basic V2X service, information service V2X service, and entertainment information V2X service.
4. The method of claim 1, wherein the absolute priority of the corresponding service is determined according to the QoS parameter, the satisfaction level, the QCI level of the service to be scheduled, and the interference situation of the user to which the service belongs in the cell.
5. The method according to claim 1 or 4, wherein the absolute priority of the traffic is in order from high to low as: CCCH traffic, DCCH traffic, Safety V2X traffic, non-Safety basic V2X traffic, QCI 5 traffic, information service V2X traffic, SPS retransmission traffic, DS retransmission traffic, MAC control element traffic, edge user dissatisfied GBR traffic, center user dissatisfied GBR traffic, edge user dissatisfied non-GBR traffic, center user dissatisfied non-GBR traffic, edge user satisfied GBR traffic, center user satisfied GBR traffic, edge user satisfied non-GBR traffic, and center user satisfied non-GBR traffic.
6. The method of claim 1, wherein the relative priority is determined based on service satisfaction, QCI level, and channel quality of the user.
7. The method of claim 1, wherein the UE and the network side interact QCI level of the current V2X service during the UE requesting bearer resource allocation.
8. The method of claim 7, wherein the UE carries the QCI level of the traffic on a Required traffic flow QoS element in a BEARER response request message; and/or the presence of a gas in the gas,
the network side carries the QCI grade of the service on the EPS QoS information element in the ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST message or the New EPS QoS information element in the MODIFY EPS BEARER CONTEXT REQUEST message.
9. The method of claim 1, wherein the period parameter is a period interval value of the V2X traffic when the periodically transmitted V2X traffic is a fixed period;
the performing SPS scheduling according to the periodic parameter comprises: and taking the periodic interval value as the periodic interval of SPS scheduling.
10. The method of claim 1, wherein when the periodically transmitted V2X traffic is variable period, the period parameter is information indicating that the period is variable;
the performing SPS scheduling according to the periodic parameter comprises: determining the service type of the V2X service according to the QCI grade of the service, configuring Sidelink SPS configuration with a plurality of periodic intervals corresponding to the service type for the UE, and activating the Sidelink SPS resource corresponding to the current periodic interval when the current periodic interval information reported by the UE is received and the service has data to be transmitted; or, determining the service type of the V2X service according to the QCI level of the service, determining the sildelink SPS configurations of a plurality of periodic intervals according to the service type, after receiving current periodic interval information reported by the UE, selecting the sildelink SPS configuration corresponding to the current periodic interval information from the determined plurality of sildelink SPS configurations to configure to the UE, and activating the configured sildelink SPS resources when data to be transmitted exists in the corresponding service.
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