JP6590372B2 - System and method for improving resource utilization efficiency in radio section, and program - Google Patents

Description

  The present invention relates to a system and a method for improving resource utilization efficiency in a radio section when a system for preferentially controlling low-latency communication packets among packets transmitted and received between a base station and a terminal is introduced.

  As one of the characteristic services of 5G communication, a Mission Critical service utilizing low latency is assumed. On the other hand, there is a background that the use of IoT (Internet of Things) is promoted in the entire communication industry, and as an early service realization form using low-delay communication, for example, remote control of drone terminals is performed on the existing LTE network Studies have been started (see Non-Patent Document 1). The end-to-end delay time required for drone terminal mobile network control is less than 50 ms in one way. Considering the delay in the application and core NW (Network), the delay time in the radio access section Is considered to be about 10 ms.

  One of the methods proposed to satisfy this requirement is the concept of edge computing that is considered to be effective for reducing the propagation delay (see Non-Patent Document 2). Unlike conventional cloud computing (Fig. 1 (a)), edge computing (Fig. 1 (b)) has a large number of small data centers (edge servers) located near the user, The generated data is distributed to each edge server and then linked to cloud computing that is aggregated on the Internet. In edge computing, data processing is performed at a location physically close to the user, so that it is possible to reduce the propagation delay compared to the case where communication is performed through the upper layer (Internet, cloud) of the network.

  On the other hand, as a mechanism for smoothly providing a network service, there is DiffServ that guarantees QoS (Quality of Service) by determining priority by classifying traffic and controlling packet routing (Non-patent Document 3). reference).

  In DiffServ, as shown in FIG. 2, the packet that first arrives at the router is classified by the classifier. In normal IP packets, packet classification is performed using the five values of source address, source port, destination address, destination port, and protocol (similar to the packet filter of a firewall). Since the search method has a high search cost, DiffServ classifying defines and uses a TOS (Type Of Services) field in the IP header.

  The meter determines whether the packet forwarded by the classifier corresponds to the traffic profile, and the policer monitors for packet input that exceeds the specified value. Discard. Subsequently, the marker sets a DiffServ (DS) field in the transmitted packet. The DS field is an in-packet area for writing DSCP (DiffServ Code Point), and DSCP indicates a value obtained as a result of classifying packets in DiffServ.

  Finally, packet routing is performed by the scheduler at a rate corresponding to the class to which the packet belongs. At this time, in order to make the traffic flow comply with the traffic profile, some or all of the packets in the traffic are delayed, that is, shaping is also performed. For this reason, when focusing on this role, the scheduler is sometimes called a shaper. Since the buffer size of the shaper is limited, if there is no space to hold the delayed packet, the packet may be discarded as a result.

  This QoS control mechanism is utilized in VoLTE (Voice over LTE), which is a voice call system using an LTE (Long Term Evolution) line, which is a 3.9th generation mobile communication system. For example, a voice call is handled as a communication classified into nine QCI (QoS Class Identifier) 1 (delay tolerance 100 ms and bandwidth guarantee type), and thus a call using stable low-delay communication. Is supposed to be possible.

"Mission Critical Data services over LTE", Release 14, 3GPP TS 22.282 V0.1.0, February 2016 "Mobile-Edge Computing-Introductory Technical White Paper", ETSI ISG MEC, Issue 1, September 2014 D.Black, 1 other, "Differentiated Services (Diffserv) and Real-Time Communication", IETF, RFC 765, November 2015

  Even if the propagation delay can be reduced by introducing edge computing, if the amount of communication packets increases in a base station that transmits and receives data to and from a user equipment (UE: User Equipment), the end-to-end delay Since delay time due to in-station packet queuing can be a dominant factor, it is assumed that stable low-delay communication cannot be performed continuously. On the other hand, when DiffServ is introduced to guarantee QoS of services using low-latency communication such as VoLTE, high priority packets always have low delay, but packet classification and discard according to a predetermined policy. Just implement. For this reason, even when a packet with high priority is not generated, it is necessary to secure resources in the wireless section according to a predetermined policy, so that resource utilization efficiency is lowered.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a system, a method, and a program capable of improving continuous efficiency of low-delay communication and resource utilization in a wireless section. There is to do.

  In order to solve the above problems, the resource utilization efficiency improvement system of the wireless section of the present invention comprises a queue for BestEffort (BE) communication and a queue for low delay communication in the base station, and uses the mechanism of DiffServ. It is characterized by doing. Further, the present invention is characterized by monitoring in real time the resource amount, delay time, and packet loss rate in the wireless section occupied by packets sent from the low-delay communication queue, and feeding back the results to policing and scheduling.

  More specifically, the system for improving resource utilization efficiency in a wireless section of the present invention comprises a queue for best effort (BE) communication and a queue for low delay communication in a base station, and also includes a BE communication packet and low delay communication. A classifier that classifies packets, the nature and amount of traffic, the amount and delay time of the wireless section occupied by packets sent from the low-delay communication queue, a meter that monitors the packet loss rate in real time, and instructions from the meter A policer that discards the packet according to the above, a marker that writes the result classified by the classifier as a mark in the communication packet, and a scheduler that outputs the packet from the queue at a rate according to the mark written in the communication packet and the instruction from the meter With a configured QoS control function Meter are fed back in real time scheduling by policing and scheduler according policers is the information obtained, which is characterized in that is varied resources in the wireless section to be allocated to the BE communication in real time.

In other words, the present invention is a system for improving resource utilization efficiency in a radio section between a user terminal and a base station in a mobile network including a base station that accommodates a user terminal and a core network that accommodates the base station. The base station includes a low-delay communication queue for accommodating low-delay communication packets, a BE-communication queue for accommodating BestEffort (BE) communication packets, and packets received from a server at least for low-delay communication packets and BE. A packet classifying unit for classifying into communication packets, a packet discarding unit for discarding packets classified by the packet classifying unit, and a classification classified by the packet classifying unit for packets not discarded by the packet discarding unit A packet to be marked and input to the low-delay communication queue or the BE communication queue And preparative marking unit, a packet scheduling unit to retrieve the packets from the low-delay communication queue and the BE communication queue, a packet measurement unit that measures the communication status of the low-delay communication packet in the radio communication section in real time, low Based on the measurement result by the packet state measurement unit so as to satisfy the delay time and the packet loss rate required for the delayed communication packet, the wireless section resource that can be newly allocated to the BE communication packet is calculated, and based on the calculation result And a packet monitoring unit for instructing a packet discard policy of a BE communication packet to the packet discard unit and instructing scheduling of the BE communication packet to the packet scheduling unit .

  According to the present invention, a BE communication queue and a low-delay communication queue are provided in the base station, and the DiffServ mechanism is used. Therefore, the amount of BE communication packets in the base station that transmits and receives data to and from the user terminal is small. By avoiding a delay time due to packet queuing that may occur when the number increases, low delay communication can be continuously performed. In addition, the resource amount, delay time, and packet loss rate in the wireless section occupied by packets sent from the low-delay communication queue are monitored in real time, and the results are fed back to policing and scheduling, so they are assigned to BE communication. It is possible to change the resources of the radio section in real time. Thus, even when a low-delay communication packet priority control system is introduced, both low-delay communication and BE communication can be achieved without reducing resource utilization efficiency in the wireless section. The real-time control of resource allocation in the radio section for BE communication overcomes the problem of reduction in resource utilization efficiency in the radio section.

Diagram explaining edge computing Diagram explaining the mechanism of DiffServ Resource utilization efficiency improvement system configuration diagram Functional block diagram of resource utilization efficiency improvement system System flow diagram to improve resource utilization efficiency Packet monitoring unit operation flow diagram

  A wireless section resource utilization efficiency improving system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows a configuration diagram of a radio section resource utilization efficiency improvement system in the present invention, and FIG. 4 shows a functional block diagram of the radio section resource utilization efficiency improvement system in the present invention.

  The present invention is based on a mobile network having a base station 10 that accommodates a user terminal 1 that is a wireless communication terminal and a core network (not shown) that accommodates each base station 10. The mobile network can use various known architectures such as LTE (Long Term Evolution). The core network can be connected to the Internet, which is one of external networks, via a predetermined gateway.

  The deployment position of the server 20 that is the communication partner of the user terminal 1 is not questioned. That is, the server 20 may be a server on the Internet (including a server on the cloud connected to the Internet), or an edge that introduces the concept of edge computing (EC) described above with reference to FIG. It may be a server.

  As shown in FIG. 3, the configuration feature of the present invention is that the base station 10 includes a queue 101 for best effort (BE) communication and a queue 102 for low delay communication, and priority is given to low delay communication packets. This is the introduction of the DiffServ mechanism in order to guarantee QoS by performing control. That is, the base station 10 classifies the BE communication packet and the low-delay communication packet, the nature and amount of traffic, the resource amount and delay time of the wireless section occupied by the packet sent from the low-delay communication queue, A meter 120 that monitors the packet loss rate in real time, a policer / marker 130 that discards the packet in accordance with an instruction from the meter 120 and writes a result classified by the classifier as a mark in the communication packet, and a mark written in the communication packet A QoS control function including a scheduler 140 that outputs packets from the queue at a rate according to an instruction from the meter 120 is provided.

  Next, a more specific configuration and function of the present invention will be described with reference to FIG. As shown in FIG. 4, the resource utilization efficiency improving system according to the present invention includes a BE communication queue 101 and a low-latency communication queue 102, a packet receiving unit 210 that receives packets from the server 20, and at least received packets. A packet classifying unit 220 that classifies low-latency communication packets and BE communication packets, a packet discarding unit 230 that discards packets classified by the packet classifying unit, and a packet that is not discarded by the packet discarding unit 230 A packet marking unit 240 that marks a result and inputs the result to the low-delay communication queue 102 or the BE communication queue 101; a packet scheduling unit 250 that extracts a packet from the low-delay communication queue 102 and the BE communication queue 101; The extracted packet is directed to the user terminal 1 And a packet transmission unit 260 to output.

  Furthermore, the resource utilization efficiency improving system according to the present invention is a means for measuring a communication state of a low-delay communication packet in a wireless communication section in real time, as a resource occupancy measuring unit 271, a delay time measuring unit 272, a packet loss rate. A measurement unit 273. In addition, the resource utilization efficiency improving system according to the present invention instructs the packet discarding unit 230 on the packet discarding policy based on the measurement results by the resource occupation amount measuring unit 271, the delay time measuring unit 272, and the packet loss rate measuring unit 273. In addition, a packet monitoring unit 280 that instructs scheduling to the packet scheduling unit 250 is provided.

  Each of the above configurations may be implemented as hardware, or may be implemented by installing a program in a computer.

  In the present invention, the resource occupancy measurement unit 271 constantly measures the resource occupancy of the low delay communication queue 102, the delay time measurement unit 272 constantly measures the delay time of the low delay communication queue 102, and the packet loss rate. The measuring unit 273 measures the packet loss rate of the low-delay communication queue 102.

  Based on the measurement result, the packet monitoring unit 280 achieves the delay time and the packet loss rate required for the low-delay communication packet, and allows resources in the unused radio section to be allocated to the BE communication. The flow rate of the low-delay communication packet and the BE communication packet is ascertained from the packet classification unit 220, the packet discard unit 230 is instructed about the amount of packets to be discarded, and the low-delay communication packet and BE communication packet after the packet is discarded from the packet marking unit And the packet scheduling unit 250 is instructed about the packet transmission rate.

  In addition, the packet monitoring unit 280 stores in advance a database (not shown) that holds the relationship between the packet flow rate, the resource occupancy of the wireless section, the delay time, and the packet loss rate, and the database and the resource occupancy measuring unit 271. By collating the measurement results sent from the delay time measurement unit 272 and the packet loss rate measurement unit 273, the packet discard amount instructed to the packet discard unit 230 and the transmission rate of the packet instructed to the packet scheduling unit 250 are determined. .

  Next, the flow when changing the resource amount of the radio section allocated to the BE communication packet when the low delay communication packet is transmitted from the server 20 to the user terminal 1 via the base station 10 will be described. FIG. 5 is a flowchart of a system for improving the resource utilization efficiency in the wireless section, and FIG. 6 is an operation flowchart of the packet monitoring unit.

  As shown in FIG. 5, first, the low-delay communication packet transmitted from the server is received by the packet receiver 210 of the base station 10 (step S1). The received low-delay communication packet is distinguished from the BE packet by the packet classification unit 220 (step S2). After that, the packet discarding unit 230 discards the packet so as to satisfy the requested delay time and packet loss rate according to the instruction of the packet monitoring unit 280 (step S3), and the packet marking unit 240 performs marking of the low-delay communication packet. Accommodation in the delay communication queue 102 is performed (step S4).

  The low-delay communication packet accommodated in the low-delay communication queue 102 is preferentially transferred by the packet scheduling unit 250 to the packet transmission unit 260 at the transmission rate instructed by the packet monitoring unit 280 (step S5). The unit 260 transmits a low delay communication packet to the user terminal 1 (step S6).

  The resource occupancy measurement unit 271, the delay time measurement unit 272, and the packet loss rate measurement unit 273 calculate the resource occupancy, delay time, and packet loss rate from the packet input and output to the low-delay communication queue 102, and the calculation result Is fed back to the packet monitoring unit 280 (step S7). The packet monitoring unit 280 calculates a resource in the radio section that is not used from the calculation result that has been sent (step S8), and sends the resource to the packet discard unit 230 and the packet scheduling unit 250 so that the resource can be allocated to BE communication. A BE communication packet discard rate and transmission rate are instructed (step S9). The packet discard unit 230 and the packet scheduling unit 250 change the packet discard rate and the transmission rate, respectively, according to the instruction from the packet monitoring unit 280 (step S10).

  Details of the operation of the packet monitoring unit 280 in steps S8 and S9 will be described. As illustrated in FIG. 6, when the packet monitoring unit 280 receives the resource occupancy of the wireless section of the low-delay communication packet from the resource occupancy measuring unit 271 (step S21), the resource of the wireless section that can be used for the BE communication packet is determined. It is determined whether or not there is (step S22). When there is a resource, the packet monitoring unit 280 instructs the packet discarding unit 230 and the packet scheduling unit 250 about a packet discarding rate and a transmission rate in consideration of resources in the radio section that can be newly allocated to the BE communication packet (step S23). ). If there are no resources, the process ends.

  When the packet monitoring unit 280 receives the delay time of the low-delay communication queue 102 from the delay time measurement unit 272 (step S31), the packet monitoring unit 280 determines whether or not the delay time is equal to or less than the requested delay time ( Step S32). If the measured delay time is equal to or less than the required delay time, the packet monitoring unit 280 performs the process of step S23 described above. On the other hand, when the measured delay time is larger than the required delay time, the packet monitoring unit 280 instructs the packet discarding unit 230 to discard the packet so that the packet flow rate achieves the required delay time / packet loss rate. (Step S33).

  When the packet monitoring unit 280 receives the packet loss rate of the low-latency communication queue 102 from the packet loss rate measuring unit 273 (step S41), the packet monitoring unit 280 determines whether the packet loss rate is equal to or less than the required packet loss rate. (Step S42). If the measured packet loss rate is equal to or less than the required packet loss rate, the packet monitoring unit 280 performs the process of step S23 described above. On the other hand, when the measured packet loss rate is larger than the required packet loss rate, the packet monitoring unit 280 performs the process of step S33 described above.

  As described above, since the packet monitoring unit 280 plays a role of performing resource policing and scheduling of low-delay communication packets in real time and performing packet policing and scheduling based on the grasped information. The communication packet is always transmitted from the server 20 to the user terminal 1 in a state where the required delay time and packet loss rate are achieved, and further, resources in the wireless section are assigned to BE communication packets without being left unused. Can be realized.

  As described above, according to the present embodiment, the base station 10 includes the BE communication queue 101 and the low-delay communication queue 102 and uses the DiffServ mechanism. Low delay communication can be continuously performed by avoiding a delay time due to packet queuing that may occur when the BE communication packet amount increases in the base station 10 that transmits and receives. In addition, since the amount of resources, delay time, and packet loss rate in the wireless section occupied by packets sent from the low-delay communication queue 102 are monitored in real time and the results are fed back to policing and scheduling, It is possible to change the resources of the allocated radio section in real time. Thus, even when a low-delay communication packet priority control system is introduced, both low-delay communication and BE communication can be achieved without reducing resource utilization efficiency in the wireless section. The real-time control of resource allocation in the radio section for BE communication overcomes the problem of reduction in resource utilization efficiency in the radio section.

  Although one embodiment of the present invention has been described in detail above, the present invention is not limited to this. For example, in the above embodiment, for the sake of simplicity of explanation, received packets are classified into two types, BE communication packets and low-delay communication packets. May be performed. As a result, finer priority control is possible.

DESCRIPTION OF SYMBOLS 1 ... User terminal 10 ... Base station 20 ... Server 101 ... BE communication queue 102 ... Low delay communication queue 110 ... Classifier 120 ... Meter 130 ... Policer / Marker 140 ... Scheduler 210 ... Packet receiving unit 220 ... Packet classification unit 230 ... Packet discard unit 240 ... Packet marking unit 250 ... Packet scheduling unit 260 ... Packet transmission unit 271 ... Resource occupancy measurement unit 272 ... Delay time measurement unit 273 ... Packet loss rate measurement unit 280 ... Packet monitoring unit

Claims (5)

In a mobile network including a base station that accommodates a user terminal and a core network that accommodates the base station, a system for improving resource utilization efficiency in a wireless section between the user terminal and the base station,
The base station
A low-delay communication queue for accommodating low-delay communication packets;
A BE communication queue that accommodates BestEffort (BE) communication packets;
A packet classification unit for classifying packets received from the server into at least low-latency communication packets and BE communication packets;
A packet discard unit for discarding the packets classified by the packet classification unit;
A packet marking unit that marks a classification result classified by the packet classification unit with respect to a packet that is not discarded by the packet discard unit, and inputs the result into the low-delay communication queue or the BE communication queue;
A packet scheduling unit that extracts packets from the low-latency communication queue and the BE communication queue;
A packet state measurement unit that measures the communication state of low-latency communication packets in a wireless communication section in real time;
Based on the measurement result by the packet state measurement unit so as to satisfy the delay time and the packet loss rate required for the low-delay communication packet, the wireless section resource that can be newly allocated to the BE communication packet is calculated, and the calculation result And a packet monitoring unit for instructing a packet discard policy for a BE communication packet to the packet discard unit and for instructing scheduling for the BE communication packet to the packet scheduling unit. Usage efficiency improvement system. The resource utilization efficiency of the radio section according to claim 1, wherein the packet state measuring unit measures a communication state of a low-delay communication packet in a radio communication section based on a packet input / output state with respect to the low-delay communication queue. Improvement system. The packet state measuring unit includes a resource occupancy measuring unit that measures a resource occupying amount of a low-delay communication packet in a radio section, a delay time measuring unit that measures a delay time, and a packet loss rate measurement that measures a packet loss rate. The resource utilization efficiency improvement system of the radio | wireless area of Claim 1 or 2 characterized by the above-mentioned. In a mobile network including a base station that accommodates a user terminal and a core network that accommodates the base station, a system for improving resource utilization efficiency in a wireless section between the user terminal and the base station,
The base station includes a low-delay communication queue that accommodates low-delay communication packets, and a BE communication queue that accommodates BestEffort (BE) communication packets.
A first step in which a packet classification unit classifies packets received from a server into at least low-latency communication packets and BE communication packets;
A second step in which the packet discarding unit discards the packet classified in the first step;
The packet marking unit marks the classification result classified in the first step with respect to the packet not discarded in the second step, and inputs it to the low-delay communication queue or the BE communication queue. A third step;
A packet scheduling unit for extracting a packet from the low-latency communication queue and the BE communication queue;
A fifth step in which the packet state measurement unit measures the communication state of the low-delay communication packet in the wireless communication section in real time;
Based on the measurement result of the fifth step, the packet monitoring unit calculates the radio section resources that can be newly allocated to the BE communication packet so that the delay time and the packet loss rate required for the low-delay communication packet are satisfied. And a sixth step of instructing a packet discard policy of a BE communication packet to the packet discard unit based on the calculation result and instructing scheduling of the BE communication packet to the packet scheduling unit. A method of improving resource utilization efficiency in a wireless section A non-transitory resource use efficiency improvement program for causing a computer to function as each unit in the base station according to claim 1.

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