CN1725872A - A method for communicating with a dual-mode terminal - Google Patents

Abstract

A method for communication of double mode includes judging a service is local service when a base station receives access request transmitted by source motion node, the base station indication source ( IS ) and destination moving node ( DMN ) communication by in self- organized form and sending oneself service data to DMN in direct or relay mode by source moving node ( SMN ), otherwise retransmitting service data by IS and DMN through base station and sending oneself service data to base station in direct or relay mode by SMN then to DMN in direct or relay mode .

Description

A method for communicating with a dual-mode terminal

technical field

The invention relates to mobile communication technology, in particular to a communication method for a dual-mode terminal.

Background technique

Mobile communication networks are generally divided into two categories: infrastructure-based networks and infrastructure-free networks. Among them, infrastructure-based networks, such as cellular mobile networks, use fixed base stations with multiple transceivers and can work in full-duplex mode, as well as wired backbone network systems that can transmit large-capacity to realize terminal instant Communication between mobile stations; networks without infrastructure, such as mobile ad hoc networks (Ad Hoc Network), without infrastructure, in the network, terminals configured with specific protocols, that is, mobile nodes, move directly or through other relays Nodes communicate.

At present, the cellular mobile communication technology based on infrastructure is maturing day by day. Since the base stations controlling the communication of the mobile station in the cellular network are widely distributed in various regions, the mobile station can easily complete data transmission through the base station. Therefore, using a base station in a cellular network to transmit terminal data has become the most commonly used and easiest to implement communication method at present. However, it is not easy to make large-scale adjustments after the cellular network is built, and it cannot adapt to changes in the load, that is, the number of users. In particular, due to network leakage coverage or radio waves encountering buildings, valleys, mountain shadows and other terrains during propagation, there are many dead zones, shadow areas or deep fading in the cellular network where the wireless signal of the base station cannot reach or the strength is extremely weak. Areas, such as near train tracks, inside elevators, etc. This makes the system unable to provide transmission services to the mobile stations in these areas, thus reducing the throughput of the system and reducing the performance of the system.

The mobile ad hoc network does not require infrastructure, and only needs to configure related protocols, such as routing protocols and MAC protocols, in the terminal equipment, that is, the mobile node. When the channel conditions between multiple mobile nodes are good and can meet the service transmission requirements, the multiple mobile nodes can automatically form an ad hoc network. Therefore, after the self-organizing network is formed, it is very convenient to adjust the network, and can better adapt to the change of the load. More importantly, in an ad hoc network, each mobile node is equivalent to a router, which can complete the function of discovering and maintaining routes to other mobile nodes. Direct "point-to-point" communication can be carried out between two adjacent mobile nodes, and dynamic search routes can be used between non-adjacent nodes to make data packets forwarded by other mobile nodes in a "multi-hop mode" to destination node without forwarding through the base station. Therefore, in an ad-hoc network, a mobile node can easily find neighboring mobile nodes whose wireless signal is sufficient to reach, reducing the probability of being in a dead zone, a shadow zone or a deep fading zone, thus making the system throughput as high as possible. Greatly increased and improved system performance.

However, due to the influence of technology or human factors, the control of mobile ad hoc networks is complicated at present, and its practical application is far less extensive than that of cellular networks. Moreover, it is not easy for ad hoc networks to meet the quality of service (QoS) requirements of services. For example, for voice services that require high delay, when two communicating mobile nodes are far apart, the voice data must pass through multiple relays. The mobile node can reach the receiver, which will cause a long delay, which cannot meet the delay requirement of the voice service at all. Therefore, the combination of cellular and ad hoc networks is considered to be a development trend of future wireless access networks. It can integrate the performance advantages of cellular networks and ad hoc networks, and is expected to support future high data rates and multimedia services, and provide users with adaptive and flexible access services. However, existing studies, including the Option-Opportunity Driven Multiple Access (ODMA) protocol in 3GPP, only discuss various forms of cellular and ad hoc network integration and the performance improvements they bring, without involving specific Realize the problem.

Therefore, it has become an urgent problem to provide a method for enabling a terminal to flexibly work in a cellular network, an ad hoc network, or a combination of cellular and ad hoc networks.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a communication method for a dual-mode terminal to optimize system performance.

In order to achieve the above object, the technical solution of the present invention is achieved in that:

A method for communicating with a dual-mode terminal, comprising the following steps:

A. After receiving the access request sent by the source mobile node, the base station judges whether the current service is a partial service, if yes, execute step B, otherwise, execute step C;

B. The base station instructs the source and destination mobile nodes to communicate in an ad hoc manner, and the source mobile node sends its own service data to the destination mobile node in a direct or relay manner, and then ends the current process;

C. The base station instructs the source and destination mobile nodes to forward service data through the base station, and the source mobile node sends its own service data to the base station in a direct or relay manner, and the base station then sends the service data to the destination mobile node.

In step A, the access request sent by the source mobile node carries the identity of the destination mobile node;

In step A, the judgment is: the base station judges whether the destination mobile node is in its own coverage area according to the identity of the destination mobile node carried in the access request, and whether the channel condition between the source and destination mobile nodes meets the requirements of this transmission Require.

Between the steps A and B, it further includes: the base station judges whether the current service is a real-time service,

If so, then in the step B, the base station specifies channel resources, and instructs the source and destination mobile nodes to use the specified channel resources to carry out point-to-point communication, and the source mobile node uses the specified channel resources to transfer its own business The data is directly sent to the destination mobile node, and then the current process is ended;

If not, then in the step B, the base station instructs the source and destination mobile nodes to communicate using the reserved channel resources, and the source mobile node selects a route according to its own configured routing protocol, and moves through the relay in the selected route. The node sends its own service data to the destination mobile node, and then ends the current process.

Between the steps A and B, it further includes: the base station judges whether the current service is a real-time service,

If so, then in the step B, the base station determines the path composed of relay mobile nodes that meets the real-time service delay requirement according to specific criteria, and instructs the source and destination mobile nodes to use the path for communication, and the source moves The node sends its own service data to the destination mobile node through the relay mobile node in the path, and then ends the current process;

If not, then in the step B, the base station instructs the source and destination mobile nodes to communicate using the reserved channel resources, the source mobile node selects a route according to the routing protocol configured by itself, and transfers itself to the mobile node through the selected route The service data is sent to the destination mobile node, and then the current process ends.

In step B, the specific criterion is the smallest overall path loss or the shortest path length.

In step A, after the base station judges that the current service is not a partial service, and before performing the step C, the base station further includes: the base station judges whether the current service is a real-time service,

If yes, then in the step C, the base station instructs the source and destination mobile nodes to forward the service data through the base station, the source mobile node directly sends the service data to the base station, and the base station directly sends the service data to the destination mobile node;

If not, then in step C, the base station instructs the source and destination mobile nodes to send service data to the base station using reserved channel resources, and the source mobile node selects a route to the base station according to its own configured routing protocol, and passes the The relay mobile node in the selected route sends the service data to the base station, and the base station sends the service data from the source mobile node to the destination mobile node through the relay mobile node in the selected route.

The destination mobile node is located in an area where the radio signal of the base station is difficult to effectively reach;

In step C, the step of the base station sending the service data to the destination mobile node includes the following steps:

C1. The base station broadcasts the paging destination mobile node through the broadcast channel, and judges whether it receives a valid response signal returned by the destination mobile node within the set time. If it receives it, it performs the normal downlink transmission process and ends this process. If If not received, execute step C2;

C2. The base station broadcasts the adjacent mobile nodes of the paging destination mobile node through the broadcast channel;

C3. After receiving the broadcast paging from the base station, each adjacent mobile node of the destination mobile node sends an access request to the base station respectively;

C4. The base station calculates the path loss from the base station itself to each adjacent mobile node and then to the destination mobile node, selects the path with the smallest loss, and sends the service data to the destination mobile node through the adjacent mobile nodes in the selected path.

In step C4, the step of the base station sending the service data to the destination mobile node through the adjacent mobile node in the selected path includes the following steps:

C41. The base station sends the service data to the adjacent mobile node of the destination mobile node in the selected path. After receiving the service data sent by the base station, the adjacent mobile node sends a request signaling carrying its own identification to the destination mobile node;

C42. After receiving the request signaling sent by the adjacent mobile node, the destination mobile node sends a response signaling to the adjacent mobile node. After receiving the response signaling sent by the destination mobile node, the adjacent mobile node sends The service information of this service is sent to the destination mobile node;

C43. After the destination mobile node receives the service information sent by the neighbor mobile node, it sends the allocation signaling carrying the codeword and time slot to the neighbor mobile node, and the neighbor mobile node receives the service information sent by the destination mobile node After the allocation signaling is sent, the service data is sent to the destination mobile node by using the code word and time slot allocated in the allocation signaling.

Before the step A, it further includes: the source mobile node sends an access request carrying its own identity to the base station by competing for an uplink random access channel;

In step A, when the base station receives the access request sent by the source mobile node, it first judges whether it is legal according to the identifier of the source mobile node, and if it is legal, then continues to execute the step of judging whether the current service is a partial service, Otherwise, skip this process.

Before the step A, it further includes: the source mobile node sends the access request to the base station, and then monitors the broadcast channel;

In the step B, the base station instructs the source and destination mobile nodes to communicate in an ad hoc manner through the broadcast channel, and the source mobile node sends service data after listening to the instruction from the broadcast channel;

In step C, the base station instructs the source and destination mobile nodes to forward service data through the base station through the broadcast channel, and the source mobile node sends the service data after listening to the instruction from the broadcast channel.

Visible, the method that the present invention proposes has the following advantages:

1. In the present invention, the base station determines the communication mode of the mobile node according to the type of service carried out by the terminal, that is, the mobile node, and the distance and channel conditions between the mobile nodes, thereby meeting the QoS requirements of different services and optimizing the performance of the system.

2. In the present invention, when the mobile node is in a shaded area, a deep fading area or a dead zone, the base station relays and forwards service data through the adjacent mobile nodes of the mobile node to ensure service transmission. Therefore, the probability of service transmission failure is reduced, and the throughput of the system is greatly improved.

3. In the present invention, when carrying out local services, the mobile node communicates in the self-organizing network mode, thereby releasing the base station from a large amount of forwarding work under the premise of ensuring service transmission, and reducing the load of the base station.

4. If the communication is carried out through the mobile ad hoc network alone, there will be control difficulties and the shortcomings of being unable to meet the service quality requirements of the business. Therefore, the present invention combines the current mature and widely used cellular mobile network with the mobile ad hoc network. Communication, not only can use the base station in the cellular network to achieve flexible control and meet the QoS requirements of the service, but also can take advantage of the advantages of the self-organizing network, such as the mobile node forwarding service data through multiple relay mobile nodes to make the system frequency reuse degree Advanced, to further optimize the performance of the system.

Description of drawings

FIG. 1 is a schematic diagram of a mobile node communicating in a dual-mode manner in the present invention.

Fig. 2 is a flow chart of the mobile node communicating in the dual-mode mode in the present invention.

Fig. 3 is a schematic diagram of realizing downlink transmission in an embodiment of the present invention when the destination mobile node is in an area where the radio signal of the base station cannot reach.

Fig. 4 is a flow chart of realizing downlink transmission in an embodiment of the present invention when the destination mobile node is in an area where the wireless signal of the base station cannot reach.

Fig. 5a is an effect diagram of the present invention improving system throughput when the number of users is 100.

Fig. 5b is an effect diagram of improving system throughput of the present invention when the number of users is 200.

Fig. 5c is an effect diagram of improving the system throughput of the present invention when the number of users is 300.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The present invention utilizes the combination of the currently mature and widely used cellular network and the self-organizing network to provide a method capable of enabling terminals to communicate in a dual-mode mode according to service requirements. FIG. 1 is a schematic diagram of a terminal communicating in a dual-mode mode in the present invention. Referring to FIG. 1 , the terminal in the present invention is a dual-mode terminal, that is, the terminal is a mobile node that can work in both a cellular network and an ad hoc network. The mobile node communicates in a dual-mode mode, which means that the service data between the source and the destination mobile node is forwarded through the base station, that is, the communication is carried out in the cellular network mode; or, the source and the destination mobile node communicate directly or through other relays The mobile node transmits service data, that is, communicates in an ad hoc network mode; or, the source and destination mobile nodes transmit service data through other relay mobile nodes and base stations, that is, communicates in a combination of ad hoc network and cellular network .

Fig. 2 is a flow chart of the mobile node communicating in the dual-mode mode in the present invention. Referring to Fig. 2, in the present invention, the specific implementation process that mobile node communicates in dual-mode mode comprises the following steps:

Step 201: The source mobile node with a service request sends an access request signaling (RA Req) to the base station through an uplink random access channel RACH.

Here, the access request signaling sent by the source mobile node includes its own identification (ID), the service type of the data to be sent, the number of data packets to be sent, and the ID of the destination mobile node. In addition, the source mobile node may send the access request signaling in a traditional way, that is, by contending for an uplink random access channel RACH.

Step 202: After receiving the access request signaling sent by the source mobile node, the base station authenticates the source mobile node to determine whether it is legal. If it is legal, execute step 203. If not, reject the source mobile node Connect to the network and end this process.

Step 203: the base station allows the source mobile node to access the network, and the source mobile node starts to monitor the broadcast channel BCCH, waiting for a policy decision from the base station.

Step 204: the base station judges whether the current service is a local service, if yes, execute step 205, otherwise, execute step 210.

Here, the process for the base station to judge whether this service is a partial service is as follows: the base station judges whether the source and destination mobile nodes are both in their own coverage areas, and whether the channel conditions between the source and destination mobile nodes, such as channel bandwidth, can satisfy The requirements for this service transmission. If both conditions are satisfied, the base station considers this service as a local service, and if any of the conditions is not satisfied, the base station considers this service as a non-local service.

Step 205: The base station judges whether the current service is a real-time service according to the service type of the data to be sent carried in the access request signaling. If yes, perform step 206; if not, perform step 208.

Here, the real-time service may be a voice service, and the non-real-time service may be an ordinary data service.

Steps 206 to 207: The base station specifies channel resources, and instructs the source and destination mobile nodes to use the designated channel resources to communicate in the ad hoc network mode, and the source and destination mobile nodes use the channels specified by the base station to communicate in the ad hoc network mode. point-to-point direct communication.

The specific implementation process here is: the base station makes a policy decision, specifies channel resources for this service, including the channel and bandwidth used by the source and destination mobile nodes for communication, and specifies the source and destination mobile nodes to use the specified channel The resource conducts point-to-point direct communication in the self-organizing network mode, and then the base station broadcasts the policy decision on the downlink broadcast channel BCCH; after the source mobile node monitors the policy decision sent by the base station from the broadcast channel BCCH, it passes The channel directly sends its own service data to the destination mobile node until the service ends.

Here, because it is a local real-time service, the base station specifies channel resources for the source and destination mobile nodes, and the source and destination mobile nodes use the specified channel resources to conduct point-to-point direct communication in an ad hoc network mode, which can greatly reduce transmission Delay, so as to meet the requirements of real-time business.

Here, in order to save transmission power, the source and destination mobile nodes can also communicate in a multi-hop manner through other relay nodes under the condition that the transmission delay of this real-time service is allowed. Correspondingly, the specific implementation process of steps 206 to 207 is: the base station makes a policy decision, that is, under the condition that the real-time service delay is allowed, according to a certain criterion, such as the smallest overall path loss or the shortest path length etc., select the route between the source and the destination mobile node, and specify the source and the destination mobile node to communicate in the multi-hop mode of the ad hoc mode according to the selected route, and then the base station broadcasts the policy decision in the downlink broadcast channel BCCH; the source After the mobile node listens to the strategy decision sent by the base station from the broadcast channel BCCH, it sends its own service data to the destination mobile node through each relay mobile node in the route selected by the base station until the service ends.

Steps 208 to 209: The base station instructs the source and destination mobile nodes to use the reserved channel resources to communicate in the ad hoc network mode, and the source and destination mobile nodes select a route and pass through each relay node in the selected route to communicate in the ad hoc network mode Perform multi-hop communication.

The specific implementation process here is as follows: the base station makes a policy decision, that is, instructs the source and destination mobile nodes to use the reserved channel resources to communicate in the ad hoc network mode, and then broadcasts the policy decision in the downlink broadcast channel BCCH; the source mobile node broadcasts the policy decision from the broadcast After listening to the policy decision sent by the base station in the channel, select a route according to the routing protocol configured by itself, and then send the service data to the destination mobile node through each relay mobile node in the selected route until the end of the service.

Here, since the non-real-time service does not have excessive requirements on transmission delay, the base station only needs to instruct the source and destination mobile nodes to communicate through reserved channel resources.

Step 210: The base station judges whether the current service is a real-time service according to the service type of the data to be sent carried in the access request signaling. If yes, perform step 211, and if not, perform step 213.

Steps 211 to 212: the base station instructs the source and destination mobile nodes to forward service data through the base station in the cellular network mode, and the source and destination mobile nodes communicate directly through the base station in a single-hop manner, that is, in the cellular network mode.

The specific implementation process here is: the base station makes a policy decision, that is, instructs the source and destination mobile nodes to communicate in the cellular network mode, that is, the mode in which the base station forwards service data, and then the base station broadcasts the policy decision in the downlink broadcast channel BCCH; the source mobile node After the node listens to the strategy decision sent by the base station from the broadcast channel BCCH, it sends its own service data directly to the base station, and the base station sends the service data directly to the destination mobile node until the end of the service.

Here, since it is a non-local real-time service, if the base station instructs the source and destination mobile nodes to communicate in ad-hoc mode, the source and destination mobile nodes need to select routes according to the routing protocol, and pass through multiple relay nodes to transmit their own business The data is sent to the receiver, which will cause a large transmission delay, which cannot meet the requirements of real-time services for transmission delay. Therefore, the strategic decision made by the base station is to make the source and destination mobile nodes forward service data directly through the base station itself, so as to reduce transmission links and transmission delay, and meet the requirements of this real-time service.

Steps 213 to 214: The base station instructs the source and destination mobile nodes to forward service data through the base station and relay mobile nodes, and the source and destination mobile nodes communicate with each relay mobile node through the base station in a multi-hop manner, that is, an ad hoc network Communication with the cellular network.

The specific implementation process here is: the base station makes a policy decision, that is, instructs the source and destination mobile nodes to use the reserved channel resources to forward their own business data to the base station through the relay mobile node, and then the base station forwards the business data through the relay node to the destination mobile node, and then the base station broadcasts the policy decision in the downlink broadcast channel BCCH; after the source mobile node monitors the policy decision of the base station from the broadcast channel BCCH, it selects the route to the base station according to the routing protocol configured by itself, and passes the business data through Each relay mobile node in the selected route forwards it to the base station, and the base station sends the received service data to the destination mobile node through each relay mobile node in the route selected by itself until the service ends.

So far, the present invention completes the process of enabling the mobile node to communicate in a dual-mode mode combining the self-organizing network and the cellular network.

In the present invention, when the mobile node forwards service data through the base station, if the destination mobile node is in a shadow, deep fading area or dead zone where the wireless signal of the base station cannot reach, the base station cannot transmit the service data in the downlink transmission link. The data is sent to the destination mobile node. In order to solve this problem, the method of the present invention is: the base station broadcasts the adjacent mobile nodes of the paging destination mobile node, and after receiving the response returned by the adjacent mobile nodes of the destination mobile node, selects an adjacent mobile node as the middle the relay mobile node, and then send the service data to the destination mobile node through the selected relay mobile node.

The following is an embodiment of the present invention for providing downlink transmission for the destination mobile node in shadow, deep fading area or dead zone. In this embodiment, the destination mobile node in the shadow, deep fading area or dead zone is mobile node C, and the base station learns that mobile node A and mobile node B are neighboring mobile nodes of mobile node C. Here, the reason why the base station can know that mobile node A and mobile node B are adjacent mobile nodes of mobile node C is because, when initially establishing a route, destination mobile node C will broadcast its detection frame in the broadcast channel BCCH; After listening to the detection frame sent by mobile node C from the broadcast channel BCCH, mobile node A and mobile node B know that they are adjacent nodes of mobile node C; mobile node A and mobile node B regard themselves as adjacent nodes of mobile node C respectively. The node information is reported to the base station, so that the base station knows that the adjacent mobile nodes of the target mobile node C are mobile node A and mobile node B.

Fig. 3 is a schematic diagram of realizing downlink transmission in an embodiment of the present invention when the destination mobile node is in an area where the radio signal of the base station cannot reach. Fig. 4 is a flow chart of realizing downlink transmission in an embodiment of the present invention when the destination mobile node is in an area where the wireless signal of the base station cannot reach. Referring to Fig. 3 and Fig. 4, in the present invention, the specific implementation process that the base station sends service data to the purpose mobile node C in the downlink transmission link includes the following steps:

Step 401: The base station broadcasts the paging destination mobile node C through the broadcast channel BCCH, and judges whether a valid response signal returned by the mobile node C is received within the set time. If it is received, the normal downlink transmission process is performed, and this process ends , if not received, go to step 402.

Here, if the base station does not receive the response signal returned by the destination mobile node C within the set time, or the received response signal is very weak, it considers that no valid response signal returned by the mobile node C has been received.

Step 402: The base station broadcasts the ID of the mobile node C on the broadcast channel BCCH to page the neighboring mobile nodes of the mobile node C.

Here, the base station paging the adjacent mobile nodes of the mobile node C in the broadcast channel is to trigger the mobile node A and the mobile node B to communicate with the base station, so as to complete the subsequent work of forwarding service data through the adjacent mobile nodes.

Step 403: After listening to the paging of the base station from the broadcast channel BCCH, the adjacent mobile nodes A and B of the mobile node C send their own access request signaling to the base station through the random access channel RACH.

Step 404: After receiving the access request signaling from mobile nodes A and B, the base station calculates the path loss from itself to mobile node A to destination mobile node C, and from itself to mobile node B to destination mobile node C path loss.

Step 405: The base station compares the calculated two path losses, and selects the path with the smaller loss, such as selecting the path from the base station to the mobile node A and then to the destination mobile node C, and then the base station broadcasts the path loss on the broadcast channel BCCH. selected path.

Here, since the base station selects a path from itself to mobile node A and then to mobile node C, mobile node A becomes the relay mobile node for this service transmission.

Step 406: the base station sends the current service data to the mobile node A, and the mobile node A sends a request signaling (REQ) carrying its own ID to the mobile node C after receiving the service data.

Step 407: After receiving the request signaling (REQ) carrying its ID sent by the mobile node A, the mobile node C returns a response signaling (REP) to the mobile node A.

Here, the purpose of exchanging REQ signaling and REP signaling is to prepare mobile nodes C and A for communication.

Step 408: After receiving the response signaling (REP) sent by the mobile node C, the mobile node A sends the relevant service information to the mobile node C.

Here, the relevant service information refers to information such as the bit rate of the packet, the required signal-to-noise ratio (SIR), and the length of the data packet.

Step 409: After receiving the relevant service information sent by the mobile node A, the mobile node C sends the allocation signaling (ALLC) to the mobile node A.

Here, the ALLC signaling includes the sending code word and the time slot allocated by the mobile node C for the mobile node A.

Step 410: After receiving the allocation signaling (ALLC) from the mobile node C, the mobile node A sends the service data packet to the mobile node C by using the code word and time slot allocated in the ALLC signaling.

So far, the present invention completes the process of providing downlink transmission for the destination mobile node in the shadow, deep fading area or dead zone.

Fig. 5a, Fig. 5b and Fig. 5c show the improvement of the system downlink throughput by the present invention under different numbers of users. It can be seen that, using the method of the present invention for enabling mobile nodes to communicate in a dual-mode manner, the system downlink throughput is significantly greater than the throughput of simple cellular communication, and the degree of throughput improvement increases with the number of users and the radius of the cell. increase with the increase of the area of the area. This is because the more users and the larger the radius of the cell, the more the number of terminals in the shadow, deep fading or dead zone in the cellular network, then, using the method of the present invention, the terminal number in the shadow, deep fading or The terminal in the dead zone, that is, the mobile node, has a higher probability of finding the relay node, and more terminals realize communication. Therefore, the improvement effect on the system throughput is more obvious.

In a word, the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A method for communicating with a dual-mode terminal, characterized in that the method comprises the following steps: A. After receiving the access request sent by the source mobile node, the base station judges whether the current service is a partial service, if yes, execute step B, otherwise, execute step C; B. The base station instructs the source and destination mobile nodes to communicate in an ad hoc manner, and the source mobile node sends its own service data to the destination mobile node in a direct or relay manner, and then ends the current process; C. The base station instructs the source and destination mobile nodes to forward service data through the base station, and the source mobile node sends its own service data to the base station in a direct or relay manner, and the base station then sends the service data to the destination mobile node. 2. The method according to claim 1, wherein in step A, the access request sent by the source mobile node carries the identity of the destination mobile node; In step A, the judgment is: the base station judges whether the destination mobile node is in its own coverage area according to the identity of the destination mobile node carried in the access request, and whether the channel condition between the source and destination mobile nodes meets the requirements of this transmission Require. 3. The method according to claim 1, characterized in that between step A and step B, further comprising: the base station judging whether the current service is a real-time service, If so, then in the step B, the base station specifies channel resources, and instructs the source and destination mobile nodes to use the specified channel resources to carry out point-to-point communication, and the source mobile node uses the specified channel resources to transfer its own business The data is directly sent to the destination mobile node, and then the current process is ended; If not, then in the step B, the base station instructs the source and destination mobile nodes to communicate using the reserved channel resources, and the source mobile node selects a route according to its own configured routing protocol, and moves through the relay in the selected route. The node sends its own service data to the destination mobile node, and then ends the current process. 4. The method according to claim 1, characterized in that between step A and step B, further comprising: the base station judging whether the current service is a real-time service, If so, then in the step B, the base station determines the path composed of relay mobile nodes that meets the real-time service delay requirement according to specific criteria, and instructs the source and destination mobile nodes to use the path for communication, and the source moves The node sends its own service data to the destination mobile node through the relay mobile node in the path, and then ends the current process; If not, then in the step B, the base station instructs the source and destination mobile nodes to communicate using the reserved channel resources, the source mobile node selects a route according to the routing protocol configured by itself, and transfers itself to the mobile node through the selected route The service data is sent to the destination mobile node, and then the current process ends. 5. The method according to claim 4, wherein in step B, the specific criterion is the smallest overall path loss or the shortest path length. 6. The method according to claim 1, wherein in step A, after the base station judges that the current service is not a partial service and before performing the step C, the base station further includes: the base station judges whether the current service is real-time business, If yes, then in the step C, the base station instructs the source and destination mobile nodes to forward the service data through the base station, the source mobile node directly sends the service data to the base station, and the base station directly sends the service data to the destination mobile node; If not, then in step C, the base station instructs the source and destination mobile nodes to send service data to the base station using reserved channel resources, and the source mobile node selects a route to the base station according to its own configured routing protocol, and passes the The relay mobile node in the selected route sends the service data to the base station, and the base station sends the service data from the source mobile node to the destination mobile node through the relay mobile node in the selected route. 7. The method according to claim 1, wherein the destination mobile node is located in an area where the radio signal of the base station is difficult to effectively reach; In step C, the step of the base station sending the service data to the destination mobile node includes the following steps: C1. The base station broadcasts the paging destination mobile node through the broadcast channel, and judges whether it receives a valid response signal returned by the destination mobile node within the set time. If it receives it, it performs the normal downlink transmission process and ends this process. If If not received, execute step C2; C2. The base station broadcasts the adjacent mobile nodes of the paging destination mobile node through the broadcast channel; C3. After receiving the broadcast paging from the base station, each adjacent mobile node of the destination mobile node sends an access request to the base station respectively; C4. The base station calculates the path loss from the base station itself to each adjacent mobile node and then to the destination mobile node, selects the path with the smallest loss, and sends the service data to the destination mobile node through the adjacent mobile nodes in the selected path. 8. The method according to claim 7, wherein in step C4, the step of the base station sending the service data to the destination mobile node through the adjacent mobile node in the selected path comprises the following steps: C41. The base station sends the service data to the adjacent mobile node of the destination mobile node in the selected path. After receiving the service data sent by the base station, the adjacent mobile node sends a request signaling carrying its own identification to the destination mobile node; C42. After receiving the request signaling sent by the adjacent mobile node, the destination mobile node sends a response signaling to the adjacent mobile node. After receiving the response signaling sent by the destination mobile node, the adjacent mobile node sends The service information of this service is sent to the destination mobile node; C43. After the destination mobile node receives the service information sent by the neighbor mobile node, it sends the allocation signaling carrying the codeword and time slot to the neighbor mobile node, and the neighbor mobile node receives the service information sent by the destination mobile node After the allocation signaling is sent, the service data is sent to the destination mobile node by using the code word and time slot allocated in the allocation signaling. 9. The method according to claim 1, further comprising: before the step A, the source mobile node sends an access request carrying its own identity to the base station by competing for an uplink random access channel; In step A, when the base station receives the access request sent by the source mobile node, it first judges whether it is legal according to the identifier of the source mobile node, and if it is legal, then continues to execute the step of judging whether the current service is a partial service, Otherwise, skip this process. 10. The method according to claim 1, further comprising: before the step A, the source mobile node sends the access request to the base station, and then monitors the broadcast channel; In the step B, the base station instructs the source and destination mobile nodes to communicate in an ad hoc manner through the broadcast channel, and the source mobile node sends service data after monitoring the instruction from the broadcast channel; In step C, the base station instructs the source and destination mobile nodes to forward the service data through the broadcast channel, and the source mobile node sends the service data after listening to the instruction from the broadcast channel.

Images