CN102111819A - Delay-tolerant network - Google Patents

Abstract

A delay tolerant network, belonging to the field of wireless communication technology, is characterized in that it contains: a communication core network including a mobile communication backbone network and the Internet, at least one delay tolerant server, at least one wireless access station including a base station or WLAN At least one mobile communication access network device, at least one wireless communication link, and at least one wireless communication terminal including mobile phones, PDAs and portable computers, the advantage of which is that it increases the network's ability to withstand delay tolerance, The service capability of the network for service requests with different delay tolerances is improved, thereby effectively improving the resource usage efficiency of the network.

Description

A Delay Tolerant Network

technical field

The invention provides a new type of delay tolerant network, which belongs to the field of wireless communication technology, and particularly relates to a new type of network architecture in which a delay tolerant server is added between the network access point and the network, which enhances the ability of the network to withstand delays and improves It improves the network's ability to serve services with different levels of delay tolerance, and effectively improves the resource utilization efficiency of the network.

Background technique

The wireless network represented by mobile communication and wireless local area network has become an important high-tech pillar industry in all countries in the world. A common goal of these wireless networks is to provide worldwide wireless communication applications with higher speed, better flexibility and scalability, and lower cost. On the other hand, the integration of telecommunication services and Internet services will become the development trend of next-generation network services. New changes have taken place in users' demands on services. More data services no longer require real-time transmission like voice services in the past. Among the data services widely used by netizens, non-real-time services gradually occupy a dominant position. However, for non-real-time services, the existing and upcoming wireless networks have relatively large restrictions on the ability to tolerate delays, resulting in limitations in the comprehensive optimization and utilization of wireless resources in the network, and the optimal matching of resources and services cannot be well realized. And the resulting wireless communication bottleneck problem is becoming more and more prominent.

The so-called delay tolerance of the network refers to the maximum time that the network can tolerate to complete the processing of the service request. There are two main reasons for the limitation of this capability. One is that due to many limitations such as the memory size of the hardware in the network and the protocol window, the service data cannot be stored for a long time in the network, and it may not be sent to the destination. The second is that the existing network is generally first-come-first-served, and there is no active scheduling mechanism to coordinate various resources within a certain period of time, so it is impossible to allocate corresponding business services on time and on demand.

The delay-tolerant network proposed in recent years refers to a network that mainly carries non-real-time services, is oriented to message delivery, and has high network throughput. It breaks through the limitations of traditional networks on delay and data transmission rate. The existing delay-tolerant network, which is a research hotspot at home and abroad, is mainly suitable for long-distance wireless links, and it can deal with the adverse situations such as link instability, large transmission delay, or link disconnection caused by it. It mainly includes the network corresponding to the following scenarios Applications: Space networks such as airships, satellites, and deep space, disaster emergency communication networks, underwater communication networks, free space optical communication networks, military Ad-Hoc networks, etc. At the same time, delay tolerant networks may also be applied to wireless mobile communications in underdeveloped areas. However, existing wireless communication systems (such as GSM, 3G, etc.) can provide users with reliable links, but they cannot actively adjust network resources to meet the different needs of different users for non-real-time service delay tolerance. The active scheduling mechanism realizes the mobile wireless network of non-real-time service transmission, which should obviously also be considered in the category of delay tolerant network.

Based on the above considerations, the present invention proposes a novel delay tolerant network. In the present invention, a delay-tolerant server is added between a network access point (such as a base station of a cellular network) and a network (such as a backbone network of a cellular network), and combined with the service request information provided by the access point and the resource information provided by the network, the two through the introduction of the delay processing device, the present invention increases the delay capability of the network, improves the service capability of the network for business requests with different delay tolerances, and effectively improves the resources of the network Use efficiency.

Contents of the invention

The purpose of the present invention is to provide a novel delay tolerant network. Based on the existing network architecture, the network adds delay-tolerant servers between the mobile communication access network and the communication core network (including the mobile communication backbone network and the Internet) to provide users with business services with different delay tolerances.

The new delay-tolerant network proposed by the present invention has the following characteristics: different users can attach their delay-tolerant information for services to the service request and send it to the delay-tolerant server; , estimate the channel state information between the access point and the service applicant at the current moment, and use signal estimation and prediction technology to estimate and predict the wireless channel state information within the delay tolerance time; on the other hand, it can tolerate delay according to different user services requirements, and corresponding wireless channel state information, determine the priority of different services, and dynamically allocate network resources such as time slots, spectrum, and power, and perform service access control according to the available resources of the core network, so as to cope with a large number of services. emergency.

Thinking of the present invention is:

(1) A new type of delay-tolerant network contains at least one delay-tolerant server, which is the core server that realizes optimal matching of resources and services, and performs network resource allocation based on service delay-tolerant characteristics between the wireless communication access network and the core network with flow control.

The present invention connects a delay tolerance server between a communication core network (such as a mobile communication backbone network or the Internet) and a mobile communication access network device (base station or WLAN access point). For uplink service transmission, the delay-tolerant server first obtains service requests and service data information from mobile terminal users, and pushes them to the core network. Link wireless channel status information and different business delay tolerance requirements determine the priority of different business transmissions, reasonably adjust the business transmission sequence, and perform dynamic uplink wireless channel resource allocation; on the other hand, it can be based on available resource information obtained from the core network And as well as core network status information, flow control is performed. For downlink service transmission, the delay tolerant server first obtains service data information from the core network, and in the process of pushing it to the mobile user terminal, on the one hand, it can determine the different service data according to the downlink wireless channel state information and service delay tolerance requirements. Service transmission priority, adjust the service transmission sequence, and use the wireless channel resources within the service tolerable delay for dynamic downlink wireless channel resource allocation; on the other hand, on the premise of meeting the delay tolerance requirements of different services, maximize the downlink transmission Capacity, reducing service waiting time, and the resulting "packet loss", improving the network's ability to tolerate delays.

(2) A delay tolerant server contains at least one wireless channel information processing unit, which can not only receive and store the current wireless channel state information estimated by the mobile station, but also predict the wireless channel status information at several moments within the service delay tolerance time. channel state.

The wireless channel information processing unit estimates and predicts the wireless channel state through the estimated value of the current channel state information and the statistical characteristics and historical information of the wireless channel. Specifically, the mobile station-assisted channel estimation method can be used to estimate the channel state of the user at the current communication moment; in addition, the historical information and statistical characteristics of the channel state can be fully utilized to predict the wireless channel state at several moments within the service delay tolerance time .

(3) A delay-tolerant server includes at least one service request processing unit, which is used to analyze the delay-tolerant QoS requirements of different user services attached to the service request.

Since the Best Effort service has no QoS requirements, the QoS requirements in the present invention are mainly aimed at real-time services and non-real-time services. When a user sends out a service request, the user's delay-tolerant QoS requirements for the requested service will be attached to the service request information. For non-real-time services, the QoS requirements mainly refer to the user's requirements for the service transmission rate, and the rate requirements can be equivalently converted into delay requirements according to the current traffic volume; for real-time services, the QoS requirements mainly refer to the user's requirements for Latency requirements for real-time business transmission.

(4) A delay-tolerant server contains at least one dynamic resource allocation unit, which determines service priority, queuing rules and resource allocation methods according to the delay-tolerant QoS requirements of different services.

The dynamic resource allocation unit can rationally and dynamically allocate resources such as frequency, time slot, and power according to the wireless channel state information obtained and predicted by the wireless channel information processing unit. Specifically, it is based on the delay-tolerant QoS requirements of different user services acquired by the service request processing unit, and the channel state information obtained and predicted by the wireless channel information processing unit, dynamically allocates resources for the services to be transmitted, and determines the priority of different service transmissions and processing order, reduce service waiting time, increase network delay tolerance capability, optimize network capacity and its delay tolerance for service transmission.

(5) A delay tolerant server includes at least one flow control unit, which performs access and flow control for business bursts according to the delay tolerance capability of the network and the state of the communication core network.

The suddenness of business will lead to the asymmetry of uplink and downlink data flowing into and out of the network, resulting in the accumulation of business on switches or servers in the communication core network, causing network congestion. Due to the limited hardware storage capacity of the network, most network protocols adopt the principle of "packet loss" for long-time waiting services, which limits the ability of the network to withstand service delays. The flow control unit of the present invention can reasonably adjust the timing of service push according to the delay tolerance requirements of different services and wireless channel state information, and through a certain access and flow control mechanism, the mobile communication access network and the communication core network Coordinate data flow among the network to avoid network congestion.

A novel delay tolerant network is characterized in that it contains:

Communication core network (including mobile communication backbone network and Internet), at least one delay-tolerant server, at least one mobile communication access network device (including base station and WLAN wireless access site), at least one wireless communication link, at least one wireless communication terminal (including mobile phones, PDAs and portable computers, etc.), of which:

The communication core network (including the mobile communication backbone network and the Internet) provides users with all types of business data information they need, including video information, audio information, text information, image information and so on. The communication core network provides users with requested service data information on demand through delay-tolerant servers and wireless access network equipment. The input/output ends of the communication core network are respectively connected to the output/input ends of the following delay-tolerant servers;

Delay tolerant server, which is the core part of the entire delay tolerant network, as the core server to achieve network resource allocation and business optimization matching, the input/output terminals are respectively connected to the output/input terminals of the above-mentioned communication core network, and the following wireless access network The output/input terminals of the equipment are connected, and it contains the following processing units: business data processing unit, wireless channel information processing unit, business request processing unit, dynamic resource allocation unit, flow control unit, control unit and external interface unit, among which:

The service data processing unit is provided with: an input terminal for receiving uplink service data output by the following external interface A, an input terminal for receiving downlink service data output by the following external interface B, and an input terminal for receiving control information output by the following control unit; It is also provided with an output terminal for sending downlink service data to the following external interface A, an output terminal for sending uplink service data to the following external interface B, and an output terminal for sending service status information to the following control unit. The service status information includes the length of the service queue in its buffer, the position of each service in the current queue, the number of remaining data packets for each service, and the delay tolerance degree.

The wireless channel information processing unit is provided with: an input terminal for receiving the current moment wireless channel state (CSI) estimation information output by the following external interface A, and an input terminal for the control information output by the following control unit; The dynamic resource allocation unit transmits the output terminal of the wireless channel state (CSI) information matrix.

The service request processing unit is provided with: an input end for receiving the service request information output by the following external interface A, an input end for the control information output by the following control unit, and an input for the service QoS acquisition information output by the following dynamic resource allocation unit end, the service QoS acquisition information refers to the delay-tolerant QoS information that needs to be obtained for new services entering the network; it also includes the output end of the user delay-tolerant QoS information sent to the following dynamic resource allocation unit.

The dynamic resource allocation unit is provided with: the input end of the service delay tolerant QoS information output by the above-mentioned service request processing unit, the input end of the wireless channel state estimation and prediction matrix output by the above-mentioned wireless channel information processing unit, and the following control unit control information The input end, and the input end of the flow control information output by the following flow control unit; there is also an output end of the service QoS acquisition information sent to the above-mentioned service request processing unit, and an output end of sending dynamic resource allocation information to the following control unit end.

The flow control unit is provided with: an input end for receiving the core network state information output by the following external interface B, and an input end for the control information output by the following control unit, the core network state information includes the current core network available Relevant status information of resources (switches, routers, etc.); there is also an output end for sending flow control information to the above dynamic resource allocation unit, and an output end for sending flow control information to the following control unit.

The control unit is provided with an input terminal for receiving the uplink/downlink service request information output by the following external interface A and the following external interface B, an input terminal for the dynamic resource allocation information output by the above dynamic resource allocation unit, and an output terminal for the above flow control unit The input end of the flow control information of the above-mentioned business data processing unit, and the input end of the business status information output by the above-mentioned business data processing unit; it is also provided with the above-mentioned business request processing unit, dynamic resource allocation unit, flow control unit, business data processing unit, the following external Interface A/B is the output terminal for sending control information.

The external interface unit A is configured to receive the input end of the uplink service data information output from the user by the mobile communication access network, the input end of the control information output by the control unit, and the downlink service data from the core network output by the service data processing unit An input terminal for information; an output terminal for sending uplink service request information to the above-mentioned service request processing unit, an output terminal for sending wireless channel state information to the wireless channel information processing unit, and an output terminal for pushing uplink service data to the service data processing unit , and an output terminal of the downlink service request information sent to the control unit.

The external interface unit B is provided with an input end of the uplink service data information from the user output by the core network, an input end of the control information output by the control unit, and an uplink service data information from the wireless access network output by the service data processing unit The input end is also provided with an output end for sending core network status information to the above-mentioned flow control unit, an output end for pushing uplink data services to the service data processing unit, and an output end for sending uplink service request information to the above-mentioned control unit.

The delay tolerant server performs its function according to the following steps:

The mobile access network equipment (base station or WLAN access site) obtains the uplink/downlink service request of the user mobile terminal, and sends it to the service request processing unit through the external interface A;

Under the action of the control unit, the service request processing unit receives the service request, and parses out the delay tolerance information of the service;

The mobile communication access network equipment receives the estimated value of the channel state information CSI that the mobile station assists in channel estimation, and sends it to the wireless channel information processing unit through the external interface A;

Under the action of the controller, the wireless channel information processing unit stores the current wireless channel state information, updates the stored channel state information history, and predicts the wireless channel information within the maximum service delay tolerance to form a wireless channel information matrix;

The service request processing unit determines the priority of each service request according to the acquired service delay tolerance information and the wireless channel state information matrix;

For uplink traffic transmission:

Under the control of the control unit, the flow control unit obtains available resources and network status information of the communication core network through the external interface B, such as the buffer space of the switch and the server, network congestion, etc., and generates flow control information;

The dynamic resource allocation unit performs uplink dynamic resource allocation according to the above wireless channel information matrix, the priority of different services, the delay tolerance QoS requirements of different services, and the flow control information of the communication core network;

The delay tolerant server transmits the above resource allocation result to the mobile access network device through the external interface A, and the mobile access network device allocates time slots, carriers, power and other resources for each uplink service according to the result, and moves from the user through the air interface The terminal acquires uplink business data and transmits it to the delay-tolerant server;

The delay tolerant server stores the service data in the service data processing unit, and pushes the service to the communication core network through the external interface B according to the above flow control information.

For downlink traffic transmission:

The dynamic resource allocation unit performs downlink dynamic resource allocation according to the above wireless channel information matrix, the priority of different services, and the delay tolerance QoS requirements of different services;

The delay tolerant server obtains the above-mentioned resource allocation result, downlink service request and its priority from the communication core network through the external interface B, and stores it in the service data processing unit;

Through the external interface A, the delay tolerant server transmits the above-mentioned downlink dynamic resource allocation result to the mobile access network device; the mobile access network device schedules the service in the service data processing unit according to the result, and allocates time slots, carriers, Power and other resources to push downlink service data for users.

The mobile communication access network equipment includes a base station and a WLAN wireless access site. During the uplink service data transmission process, the service request information from the user and the uplink service data are transmitted to the delay tolerant server and the communication core network through it; during the downlink process, the service data from the communication core network is transmitted to the user terminal. The input/output ends of the mobile communication access network equipment are respectively connected to the input/output ends of the above-mentioned delay tolerant server and the input/output ends of the following mobile terminals;

Mobile communication terminals mainly include various forms of mobile terminals that support wireless transmission, including mobile phones, notebook computers, and handheld PDAs. Its input/output ends are respectively connected with the input/output ends of the above-mentioned mobile communication network access equipment through the air interface.

Description of drawings

Figure 1 is a schematic diagram of the basic structure of the system framework of the new delay-tolerant network.

Figure 2 is a schematic diagram of the basic implementation flow of the new delay-tolerant network.

Figure 3 is a schematic diagram of the basic structure of a delay-tolerant server.

Figure 4 is a schematic diagram of the basic implementation flow of a delay-tolerant server.

Detailed ways

The basic structure of a novel delay-tolerant network described in the present invention, referring to accompanying drawing 1, contains in this basic structure:

At least one communication core network, which includes a mobile communication backbone network and the Internet. The mobile communication network provides users with multimedia service data according to user requirements. The input signal is the service request and service delay QoS information of the following delay-tolerant server, and the output is multimedia service data information and core network status information.

Several delay-tolerant servers, multiple delay-tolerant servers can meet the access requirements of users in different regions, and their input/output terminals are respectively connected to the output/input terminals of the above-mentioned communication core network, and connected to the following mobile communication network access devices The output/input ends are connected; they each contain an external interface A/B, a service data processing unit, a control unit, a service request processing unit, a dynamic resource allocation unit, a flow control unit, and a wireless channel information processing unit; the service data processing unit The input/output end distribution of the following control unit and the output/input end of the following external interface A are connected; the input end of the wireless channel information processing unit is respectively connected with the following control unit and the output end of the following external interface A The output ends are respectively connected to the following dynamic resource allocation unit and the following control unit; the input ends of the service request processing unit are respectively connected to the following external interface A, the following control unit and the output ends of the following dynamic resource allocation unit The output ends are respectively connected to the following control unit and the input end of the dynamic resource allocation unit; the input ends of the dynamic resource allocation unit are respectively connected to the above-mentioned business request processing unit, the above-mentioned wireless channel information processing unit, the above-mentioned flow control unit and the following The output end of the above-mentioned control unit is connected, and the output end is connected with the input end of the above-mentioned service request processing unit, the following flow control unit and the following control unit; the input ends of the flow control unit are respectively connected to the following control unit, the above-mentioned The dynamic resource allocation unit is connected to the output end of the following external interface B, and the output end is respectively connected to the following control unit and the input end of the above-mentioned dynamic resource allocation unit; the input/output end of the control unit is respectively connected to the business data processing unit, wireless The input/output ends of the channel state information processing unit, the service request processing unit, the dynamic resource allocation unit, the flow control unit, the control unit and the external interface unit are connected. The input ends of the external interface A are respectively connected to the above-mentioned control unit, the service data processing unit, and the following wireless access network; the output ends are respectively connected to the above-mentioned control unit, the service data processing unit, the above-mentioned service request processing unit, and the above-mentioned channel state information The processing unit is connected to the following wireless access network; the input end of the external interface B is respectively connected to the above-mentioned control unit, the service data processing unit and the following core network; the output end is connected to the above-mentioned control unit, the service data processing unit and the following The core network is connected to the above flow control unit.

At least one mobile communication access network device, including a base station and a WLAN access site, multiple mobile communication access network devices can meet the access requirements of users in different areas, and their input/output terminals are respectively connected to the output of the above-mentioned delay tolerance server /input terminal, and the output/input terminal of the following mobile terminals are connected;

At least one mobile communication terminal, the user's mobile communication terminal sends a service request and time-delayed QoS information for the service, and its input/output terminals are respectively connected to the output/input terminals of the above-mentioned mobile communication access network equipment through wireless links.

A novel delay network, characterized in that the delay tolerant network is implemented according to the following steps:

1) The user sends service request information to the mobile communication access network equipment through the mobile terminal; this information includes both the request for the service content and the user's delay-tolerant QoS requirements for the service;

2) The mobile terminal performs auxiliary channel estimation, and transmits the wireless channel state information CSI estimated value at the current moment to the mobile communication network access device;

3) The mobile communication access network equipment receives the service request information and wireless channel state CSI estimation information from the user through the air interface, and transmits it to the delay tolerant server;

4) The delay tolerant server performs uplink/downlink dynamic resource allocation based on time slot, carrier, power, user and other multi-dimensional resources according to the service request of the mobile terminal of the user, the service delay QoS requirement, and the wireless channel state information CSI, and reasonably determines the service Priority, scheduling service transmission order, and generating flow control information according to the state of the core network.

5) If the communication process is a downlink service transmission process, then:

(5.1) The delay tolerant server requests the required downlink service data from the communication core network according to the downlink service requested by the user, its priority, and the result of downlink resource allocation;

(5.2) The communication core network pushes the required downlink service data to the delay tolerant server and mobile communication access network equipment according to the service request information provided by the delay tolerant server;

(5.3) The delay tolerant server transmits the downlink service data from the communication core network to the mobile communication access device, and the mobile communication access device pushes the downlink service data according to the business priority sequence determined in 4) and the downlink dynamic resource allocation result to the user;

6) If the communication process is an uplink business transmission process, then:

(6.1) The mobile communication access network equipment obtains the user's uplink service data through the air interface according to the business priority sequence determined in 4) and the uplink dynamic resource allocation result;

(6.2) The mobile communication access network equipment transmits and stores the acquired service content data in the delay tolerant server;

(6.3) The delay tolerant server pushes the uplink service from the user mobile terminal into the communication core network according to the business priority sequence determined in 4), the uplink dynamic resource allocation result and the communication core network flow control information.

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described as follows.

The system frame basic structure of a kind of novel delay-tolerant network described in the present invention, referring to accompanying drawing 1, contains in this basic structure:

The communication core network, which includes the mobile communication backbone network and the Internet, is used to provide various multimedia service data, including picture data, video data, audio data, text data, and interactive service data obtained through user uplink transmission. , such as video/voice call data, text message (SMS) data, etc.;

Communication access network equipment, which includes base stations and WLAN access equipment, its role is to provide air interfaces for user mobile terminal users and the core communication network, receive service data information and service requests from user mobile terminals, and provide user mobile terminal Send the requested business data;

The delay tolerant server is the core of the entire network. Its function is to determine the priority of services and dynamically adjust the order of service transmission according to the user's service delay QoS requirements, wireless channel state information CSI, and communication core network state information. The data flow of the core network is controlled, and wireless communication resources are allocated, and then the network capacity and the delay tolerance of service transmission are improved while meeting the user's delay QoS requirements. In the uplink communication process, the uplink wireless communication resource allocation based on the wireless access network is mainly carried out, and the flow control for the state of the communication core network is mainly carried out; the downlink communication is mainly for the downlink wireless communication resource allocation for the wireless access network;

Mobile terminals, which include wireless mobile communication terminals such as mobile phones, notebook computers, and handheld PDAs, are used to exchange data for interactive services with other users through various mobile terminals, or to apply for multimedia services to the communication core network. business data.

According to the above-mentioned novel delay-tolerant network structure description, the implementation process of the present invention includes the following steps (see accompanying drawing 2):

1) The user sends service request information to the mobile communication network access device through the mobile terminal, which includes both the request for the service content and the user's delay tolerance QoS information for the service;

2) The mobile terminal performs auxiliary channel estimation, and transmits the channel state information CSI estimated value at the current moment to the mobile communication network access device;

3) The mobile communication network access device receives service request information and channel state CSI estimation information from the user through the air interface, and transmits them to the delay tolerant server;

4) The delay tolerant server performs uplink/downlink dynamic resource allocation based on multi-dimensional resources such as time slot, carrier, power, and user according to user mobile terminal service requests, delay QoS requirements, and wireless channel state information CSI, and reasonably determines service priority , schedule the service transmission sequence, and generate flow control information according to the state of the core network.

5) If the communication process is a downlink service transmission process, then:

(5.1) The delay tolerant server requests the required downlink service content data from the communication core network according to the downlink service requested by the user, its priority, and the result of downlink resource allocation;

(5.2) The communication core network pushes the required downlink service data to the delay tolerant server and mobile communication access network equipment according to the service request information provided by the delay tolerant server;

(5.3) The delay tolerant server transmits the downlink service data from the communication core network to the mobile communication access device, and the mobile communication access device pushes the downlink service data according to the business priority sequence determined in 4) and the downlink dynamic resource allocation result to the user;

6) If the communication process is an uplink business transmission process, then:

(6.1) The mobile communication access network equipment obtains the user's uplink service data through the air interface according to the business priority sequence determined in 4) and the uplink dynamic resource allocation result;

(6.2) The mobile communication access network equipment transmits and stores the acquired service content data in the delay tolerant server;

(6.3) The delay tolerant server transmits the uplink service from the user mobile terminal into the communication core network according to the service order determined in 4), the uplink dynamic resource allocation result and the communication core network flow control information.

Important feature of the present invention also is that it comprises at least one delay tolerant server, and the basic structure of this delay tolerant server is referring to accompanying drawing 3, and it contains:

The service data processing unit, its function is to obtain the uplink service data information from the mobile communication access network and the downlink service data information of the core network, and store them in the memory (buffer) of the service data processing unit, this memory (buffer) It may be shared with communication network access equipment. Under the action of the following control unit, the business data processing unit adjusts the position of the business data stored at different times in the cache according to the resource allocation processing results of the following dynamic resource allocation unit and the processing results of the following flow control unit, and adjusts the business transmission sequence, and push service data information to mobile access network equipment (downlink service transmission) or communication core network (uplink service transmission).

The wireless channel state information processing unit, its function is to obtain the wireless channel state estimation information at the current moment, and estimate and predict the service delay tolerance time according to the historical information of the channel state, the statistical information of the channel state, and the delay tolerance requirements of different services Wireless channel state information at several moments in the segment. This kind of prediction is based on the wireless channel state information at the current moment, and the historical information of the channel state within several moments, and can adopt linear prediction based on MMSE (Minimum Mean Square Error), or a prediction method based on Kalman (Kalman) filtering. Thus, a multi-dimensional wireless channel state CSI matrix including time delay, frequency, power, user, etc. is generated for use by the dynamic resource allocation unit.

The service request processing unit is used to obtain the delay-tolerant QoS requirements of different services. The QoS requirements in the present invention are mainly aimed at real-time services and non-real-time services. For non-real-time services, the QoS requirements mainly refer to the user's requirements for the service transmission rate, and the rate requirements can be equivalently converted into delay requirements according to the current traffic volume; for real-time services, the QoS requirements mainly refer to the user's requirements for Latency requirements for real-time business transmission. This QoS requirement information can be implicit in the service request of the user's mobile terminal, and is separated and obtained by the service request processing unit. The service request processing unit also determines the service priority according to the service delay tolerance QoS, wireless channel resources and other information, and the determination of the service priority can be based on WFQ and other weighting methods;

Dynamic resource allocation unit, its role is to control the mobile communication access network equipment and perform dynamic resource allocation for wireless links according to the delay tolerance requirements of different services, the wireless channel state information within the service delay tolerance time, and the core network state information . The optimal resource allocation method based on LDD (Lagrangian dual decomposition), the suboptimal resource allocation algorithm based on Greedy (greedy algorithm), and various low-complexity heuristic algorithms can be used to perform dynamic resource allocation of wireless channel resources. distribute.

The flow control unit is used to obtain information from available resources of the core network and state information of the core network, and determine the maximum flow that can currently access the core network through calculation. This information is transmitted to the above-mentioned dynamic resource allocation unit as a resource allocation parameter, so as to dynamically adjust the service transmission order and determine the currently accessible services according to the available resources of the core network.

The control unit, which is the control center of the delay-tolerant server, controls the coordination and scheduling among various units; the control unit controls the service request processing unit to determine the priority of the service and adjusts the service queuing order according to the core network status information of the flow control unit ; The control unit also performs dynamic resource allocation according to the wireless channel state CSI matrix of the wireless channel state unit;

External interface unit A, its role is to connect the delay tolerance server and wireless access network equipment (such as base station, WLAN access point);

External interface unit B, its role is to connect the delay tolerance server and the core network (such as the Internet, mobile communication network);

According to the structural description of the above-mentioned delay processing device, the implementation process of the delay processing device includes the following steps (see accompanying drawing 4):

1) The mobile access network equipment receives the user's service request and the wireless channel state information CSI estimated value of the mobile station auxiliary channel estimation, and sends it to the delay tolerant server;

2) The delay tolerant server receives user service request information through the external interface A, and under the control of the control unit, the service request processing unit parses out the delay tolerant QoS information contained in the service request information;

3) The delay tolerant server receives the estimated value of the wireless channel state information CSI through the external interface A. Under the action of the controller, the wireless channel information processing unit stores and updates the history of the channel state information, and according to the current channel estimated value and the channel state history Information, predict the channel state within the maximum delay tolerance of the service, and generate a multi-dimensional wireless channel state information CSI matrix based on time slot, carrier, power, user, etc.;

4) The service request processing unit determines the priority of each service according to the wireless channel state information corresponding to each service, the flow control information, and the delay tolerance QoS information of each service;

5) If the communication process is a downlink service transmission process, then:

(5.1) Under the action of the control unit, the dynamic resource allocation unit performs downlink processing of each service stored in the service data processing unit according to the channel state information matrix in 3) and the service priority determined by the service request processing unit Dynamic resource allocation;

(5.2) Under the action of the control unit, the delay tolerant server requests the required downlink service data from the communication core network through the external interface B according to the downlink dynamic resource allocation result and the service priority order;

(5.3) The communication core network sends the requested business data to the delay-tolerant server through the external interface B, and stores it in the memory (buffer) of its business data processing unit;

(5.4) According to the above dynamic resource allocation result, the service data processing unit adjusts the service queuing order in the memory (buffer), adjusts the service transmission order, and transmits it to the mobile access network device through the external interface A;

(5.5) The mobile access network equipment allocates carriers and time slots for services according to the above dynamic resource allocation results and service priority order, and pushes them to user mobile terminals through the downlink;

6) If the communication process is an uplink business transmission process, then:

(6.1) The delay tolerant server obtains the status information of the communication core network through the external interface B, and according to this information, the flow control unit generates flow control information

(6.2) Under the action of the control unit, the dynamic resource allocation unit, according to the channel state information matrix in 3), the service priority determined by the service request processing unit, and the above-mentioned flow control information, store each resource in the service data processing unit Uplink dynamic resource allocation for business;

(6.3) The delay tolerant server sends the above dynamic resource allocation result to the mobile access network device through the external interface A;

(6.4) The mobile access network equipment transmits the uplink service data according to the above-mentioned uplink resource allocation result, and transmits the data to the delay-tolerant server through the external interface A;

(6.5) The delay tolerant server stores the service data received from the mobile access network equipment in the service data processing unit, and the flow control unit performs flow control, and pushes the service to the communication core network through the external interface B.

Claims (1)

1. A delay tolerant network, characterized in that it contains: a communication core network comprising a mobile communication backbone network and the Internet, at least one delay tolerant server, at least one mobile communication access network comprising a base station or a WLAN wireless access site Network access equipment, at least one wireless communication link, and at least one wireless communication terminal including mobile phones, PDAs and portable computers, wherein: In the communication core network, the input/output terminals are respectively connected to the first output/input terminals corresponding to the delay tolerant server, providing users with all types of business data information required, including at least video information, audio information, text information and image information, the communication core network provides the requested service data information for the user on demand through the delay tolerant server and the wireless access network equipment; The second input/output end of the delay tolerant server has a mobile communication access function and is connected to the output/input end of the wireless access network equipment, and the delay tolerant server includes: a service data processing unit, a wireless channel information processing unit, and a service request processing unit , a dynamic resource allocation unit, a flow control unit, a control unit, and two external interfaces, wherein: The service data processing unit is provided with: a first input terminal receiving the uplink service data output by the first external interface (A), a second input terminal receiving the downlink service data output by the second external interface (B), and receiving the The third input end of the control information output by the control unit is also provided with: the first output end of the downlink service data sent to the first external interface (A), the uplink service data sent to the second external interface (B) A second output terminal for data, and a third output terminal for sending service status information to the control unit, where the service status information includes: the length of the service queue in the buffer of the delay-tolerant server, the length of each service in the current queue The location in , the number of packets remaining for each service, and the delay tolerance information; The wireless channel information processing unit is provided with: a first input terminal receiving the wireless channel state CSI estimation information output by the first external interface (A) at the current moment, and a second input terminal receiving the control information output by the control unit, It is also provided with: a first output end for sending the wireless channel state CSI information matrix to the dynamic resource allocation unit, and a second output end for sending the wireless channel state CSI information matrix to the control unit; The service request processing unit is provided with: a first input terminal for receiving the service request information output by the first external interface (A), a second input terminal for the control information output by the control unit, and an output terminal for the dynamic resource allocation unit The third input terminal of the service QoS acquisition information, the service QoS acquisition information refers to the delay-tolerant QoS information that needs to be obtained for the new service entering the network and the wireless channel state information matrix sent by the wireless channel information processing unit, and There is an output end for sending user delay tolerance QoS information of the resource allocation unit, and an output end for sending service processing information to the control unit. The dynamic resource allocation unit is provided with an input end of the service delay tolerant QoS information output by the service request processing unit, an input end of the wireless channel state estimation matrix output by the wireless channel information processing unit, and control information output by the control unit The input end of the flow control information and the input end of the flow control information output by the flow control unit are also provided with an input end for sending the obtained service QoS information to the service request processing unit, and an input end for sending dynamic resource allocation information to the control unit an output terminal, and an output terminal for sending flow control information to the flow control unit; The flow control unit is provided with an input end for receiving the state information of the communication core network output by the second external interface (B), an input end for receiving the dynamic resource allocation information output by the dynamic resource allocation unit, and the control Input for control information output by the unit. Wherein the state information of the communication core network includes: relevant state information of resources including switches and routers that can be obtained by the current communication core network; an output terminal for sending flow control information to the dynamic resource allocation unit is also provided, and The control unit sends an input for flow control information. The control unit is provided with an input end for receiving the uplink service request information output by the first external interface (A), an input end for receiving the downlink service request information output by the second external interface (B), and receiving the dynamic resource The input end of the dynamic resource allocation information output by the allocation unit, the input end receiving the flow control information output by the flow control unit, and the input end receiving the service state information output by the service request processing unit; The data processing unit, the dynamic resource allocation unit, the flow control unit, the business data processing unit, the first external interface (A) and the output end of the second external interface (B) for sending control information; The first external interface (A) is configured to receive the uplink service data information from the user terminal output by the mobile communication access network equipment, and the uplink service resource allocation result from the control unit, and receive the output from the control unit The input end of the control information and the input end of the uplink or downlink service data information from the communication core network output by the service data processing unit; it is also provided with: an output end for sending uplink service request information to the service request processing unit , sending an output end of wireless channel state information to the wireless channel information processing unit, an output end of sending uplink service data to the service data processing unit, an output end of sending uplink service request information to the control unit, and sending an output end of uplink service request information to the control unit, and An output terminal where the mobile communication core network sends an uplink service request from a user of the wireless access network or the communication core network; The second external interface (B) is provided with: the input end of the uplink service data information from the user terminal output by the communication core network, the input end of the control information output by the control unit, and the output of the service data processing unit The input end of the uplink service data information from the radio access network is also provided with: the user uplink service processing data information from the communication core network or from the radio access network output to the mobile communication access network an output terminal for sending uplink service request information to the service request processing unit, an output terminal for sending wireless channel state information to the wireless channel information processing unit, and an output terminal for sending uplink service data to the service data processing unit value and the output end of the uplink service request information sent to the control unit. The delay tolerant server realizes its function according to the following steps in turn: Step (1), the mobile access network device obtains the uplink service request of the mobile terminal of the user, and then sends it to the service request processing unit through the first external interface (A); Step (2), the first external interface (A) sends the uplink or downlink service request information described in step (1) to the control unit, and the control unit outputs control information to the service request processing unit, so The service request processing unit receives the uplink or downlink service request and its maximum delay tolerance information; Step (3), the mobile communication access network equipment receives the estimated value of the wireless channel state information CSI that the mobile station assists in channel estimation, and sends the estimated value to the wireless channel through the first external interface (A) information processing unit; Step (4), the wireless channel information processing unit stores the estimated value of the current wireless channel state information CSI under the control of the control information output by the control unit, updates the newly stored channel state information history information, and Predict the wireless channel information within the maximum delay tolerance of the service to form a wireless channel information matrix, and then input it to the service request processing unit; Step (5), the service request processing unit determines the priority of each service request according to the obtained maximum delay tolerance information of each service and the wireless channel state information matrix: for the uplink service transmission, perform steps (6) to (9) ), execute step (10) for downlink service transmission; Step (6), under the control of the control unit, the flow control unit obtains the available resources of the communication core network and the information output by the communication core network through the second external interface (B), which at least includes The buffer storage space of the switch and the server, and the network congestion state of the communication core network, and generate flow control information. In step (7), the dynamic data allocation unit determines the value of each service request according to the wireless channel information matrix transmitted from the wireless channel information processing unit and the delay capacity information of each service input from the service request processing unit. Priority, from the flow control information of the communication core network input by the flow control unit, perform uplink dynamic resource allocation, the resource allocation results pass through the control unit in turn, and the first external port (A) transmits the mobile communication interface network access equipment. In step (8), the radio access network device interface allocates resources including time slots, carrier frequencies, and power for each uplink service based on the dynamic resource allocation results, and then actively acquires resources from the user mobile terminal through the air interface. Uplink service data, and transmit to the first external interface (A). Step (9) The first external port (A) stores the uplink service data in the service data processing unit, and receives flow control information from the control unit through the second external port (B), and sends The uplink service is transmitted to the communication core network. Step (10) For the downlink service data information from the communication core network, enter the first external interface (A) through the second external interface (B) and the service data processing unit in turn, and then transmit it to the The service request processing unit is processed according to the steps (6) and (7), and the dynamic resource allocation unit obtains the priorities of different services of the wireless channel matrix corresponding to the downlink service data information, and the maximum delay tolerance information of different services, Perform dynamic resource allocation of downlink service data, and then according to the step (8), transmit the downlink data information obtained from the core network to the mobile terminal of the user according to the result of dynamic resource allocation.

Images