CN115695289B - Heterogeneous multi-hop expansion network - Google Patents
Heterogeneous multi-hop expansion network Download PDFInfo
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- CN115695289B CN115695289B CN202310000678.9A CN202310000678A CN115695289B CN 115695289 B CN115695289 B CN 115695289B CN 202310000678 A CN202310000678 A CN 202310000678A CN 115695289 B CN115695289 B CN 115695289B
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Abstract
The invention discloses a heterogeneous multi-hop expanded network, which comprises special terminals positioned inside and outside a heterogeneous network communication area, wherein the special terminals positioned inside the heterogeneous network communication area and the special terminals positioned outside the heterogeneous network communication area form an ad hoc network, so that the communication range of the network is effectively expanded, and the communication effect is improved. The heterogeneous network is internally provided with a routing information collecting and forwarding functional entity, the routing information collecting and forwarding functional entity and all the special terminals externally issue self-networking state information, and each piece of self-networking state information passes through the routing information collecting and forwarding functional entity and all the special terminals through the self-networking and heterogeneous network, so that when a certain special terminal or the routing information collecting and forwarding functional entity needs to send or forward a message, the best routing can be selected according to global routing planning to send or forward, and the communication efficiency is effectively improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a heterogeneous multi-hop expanded network.
Background
The wireless communication networks represented by the 5G cellular network and the WiFi6 have the outstanding advantages of large bandwidth, low time delay, high capacity and the like, but the wireless communication networks rely on infrastructure such as optical fibers and commercial power, terminals can only communicate in a network communication area (a base station or an access point coverage area), and the application range under special scenes is greatly reduced. The wired network, although having the advantages of high speed, stability, reliability, etc., cannot be moved, has extremely limited network communication area, and is difficult to be deployed and used with the domain.
The ad hoc network has the advantages of no center, self-organization, independence on infrastructure, multi-hop self-relay and the like, and can be widely applied to special scenes such as emergency, military and the like. However, compared with other networks, the ad hoc network also generally has the problems of low speed, large time delay, limited capacity and the like, and the popularization and application of the ad hoc network are seriously influenced.
Therefore, how to effectively expand the communication range of the network by using the heterogeneous networking technology and realize efficient network transmission, load sharing and cross-domain intercommunication becomes a problem to be solved in the current field.
Disclosure of Invention
The invention aims to: the invention aims to provide a heterogeneous multi-hop expanded network, which can effectively expand the communication range of the network, improve the communication efficiency, realize high-efficiency transmission, load sharing and cross-domain intercommunication of the network and solve the problems in the prior art.
The technical scheme is as follows: the heterogeneous multi-hop expanded network comprises special terminals positioned inside and outside a heterogeneous network communication area, wherein the special terminals positioned inside and outside the heterogeneous network communication area form an ad hoc network, a routing information collecting and forwarding functional entity is arranged in the heterogeneous network, the routing information collecting and forwarding functional entity and all the special terminals externally issue self ad hoc network state information of the routing information collecting and forwarding functional entity, each piece of ad hoc network state information passes through the routing information collecting and forwarding functional entity and all the special terminals through the ad hoc network and the heterogeneous network, so that each special terminal can receive the ad hoc network state information of all other special terminals and the routing information collecting and forwarding functional entity, the routing information collecting and forwarding functional entity can receive the ad hoc network state information of all the special terminals, each special terminal and the routing information collecting and forwarding functional entity set a routing table according to the received ad hoc network state information, and send or forward other messages except the ad hoc network state information according to the routing table.
Further, the routing information collecting and forwarding functional entity includes:
a receiving module: the system comprises a special terminal, a heterogeneous network communication area and a routing information collection and forwarding function entity, wherein the special terminal is used for receiving ad hoc network state information or other messages which are sent or forwarded by the special terminal and are positioned in the heterogeneous network communication area and are provided with effective routing information collection and forwarding function entity addresses;
the identification processing module: the system is used for judging whether the ad hoc network state information received by the receiving module is generated by the special terminal sending the ad hoc network state information or other special terminals: if the ad hoc network state information is generated by a special terminal sending the ad hoc network state information, and the ad hoc network state information does not have any one of the following three conditions that an information source of the ad hoc network state information is from a routing information collecting and forwarding functional entity, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified, the ad hoc network state information is judged to be effective ad hoc network state information, a state information table is updated, an aging timer is reset, and the special terminal generating and sending the ad hoc network state information is marked to be a direct effective terminal; if the ad hoc network state information is generated by other special terminals, and the ad hoc network state information does not exist any one of the following three conditions that an information source of the ad hoc network state information is from a routing information collecting and forwarding functional entity, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified, the ad hoc network state information is judged to be effective ad hoc network state information, a state information table is updated, an aging timer is reset, and the other special terminals generating the ad hoc network state information are marked as non-direct effective terminals;
a routing module: the system comprises a router, a network management server and a router, wherein the router is used for calculating routes reaching each direct effective terminal and each indirect effective terminal according to received ad hoc network state information generated by each direct effective terminal and each indirect effective terminal, and formulating a route forwarding strategy;
a sending module: the system is used for sending the self ad-hoc network state information of the routing information collecting and forwarding functional entity to the direct effective terminal, forwarding the received effective ad-hoc network state information to the direct effective terminal, and sending or forwarding other messages except the ad-hoc network state information to the direct effective terminal according to a routing forwarding strategy. Therefore, the routing information collecting and forwarding functional entity can calculate the routes to all the direct effective terminals and the indirect effective terminals, if messages need to be sent, the routing information collecting and forwarding functional entity can carry out global planning according to the routes of all the direct effective terminals and the indirect effective terminals, selects the optimal route to send, and effectively improves the communication efficiency.
Further, the self ad hoc network state information of the routing information collecting and forwarding functional entity includes link information of the routing information collecting and forwarding functional entity reaching a direct effective terminal, state information of the direct effective terminal, and self state information of the routing information collecting and forwarding functional entity.
Further, the identification processing module is further configured to determine whether an aging timer corresponding to the dedicated terminal is overtime, if yes, the dedicated terminal is marked as an invalid terminal, the sending module issues information related to the invalid terminal to all the direct-to-valid terminals, the routing module recalculates routing information to each direct-to-valid terminal and each non-direct-to-valid terminal, and updates a routing forwarding policy. Therefore, the route planning can be further optimized, and the communication efficiency is improved.
Further, the special terminal can select whether to connect with the general terminal, and the self ad-hoc network state information of the special terminal comprises self-ad-hoc network air interface link information, adjacent special terminal information and self state information of the special terminal; if the special terminal is a special terminal which is positioned in a heterogeneous network communication area and is provided with a routing information collecting and forwarding functional entity with an effective address, the ad hoc network state information of the special terminal also comprises routing information collecting and forwarding functional entity information and link information reaching the routing information collecting and forwarding functional entity.
Furthermore, the default route of the special terminal which is located in the heterogeneous network communication area and is configured with the effective routing information collecting and forwarding functional entity address points to the heterogeneous network, and the ad hoc network state information of the special terminal which is located in the heterogeneous network communication area and is configured with the effective routing information collecting and forwarding functional entity address also comprises default route information.
Further, the special terminal which is located in the heterogeneous network communication area and not provided with the effective routing information collecting and forwarding functional entity address and the special terminal which is located outside the heterogeneous network communication area separate one or more default routing information from the received special terminal ad hoc network state information, calculate the route reaching the default routing information source nodes, and then select the optimal next hop address as the default routing gateway address of the special terminal. Therefore, the routing planning can be optimized, and the communication efficiency is improved.
Furthermore, the special terminals located in the heterogeneous network communication area are all special terminals with effective address of the entity configured with the routing information collection and forwarding function, or are divided into two types of special terminals with effective address of the entity configured with the routing information collection and forwarding function and special terminals without effective address of the entity configured with the routing information collection and forwarding function; the special terminal for configuring the effective routing information collection and forwarding functional entity address comprises the following steps:
a receiving module: the self-networking state information or other messages sent or forwarded by the routing information collecting and forwarding functional entity and other special terminals in the same self-networking are received;
the identification processing module: the special terminal used for judging the ad hoc network state information is an effective terminal: if the ad hoc network state information does not exist in any one of the following three conditions that the information source of the ad hoc network state information is from a special terminal corresponding to the receiving module, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified, the ad hoc network state information is judged to be effective ad hoc network state information, a state information table is updated, an aging timer is reset, and the special terminal generating the ad hoc network state information is marked as an effective terminal;
a routing module: the system comprises a routing information collection and forwarding functional entity, a routing information collection and forwarding functional entity and a routing information collection and forwarding functional entity, wherein the routing information collection and forwarding functional entity is used for receiving the state information of the ad hoc network generated by the effective terminals and the routing information collection and forwarding functional entity;
a sending module: the system is used for sending self-networking state information to the routing information collecting and forwarding functional entity and each effective terminal in the same ad hoc network, forwarding the received effective ad hoc network state information to the routing information collecting and forwarding functional entity and each effective terminal in the same ad hoc network, and sending or forwarding other messages except the ad hoc network state information to the routing information collecting and forwarding functional entity and each effective terminal in the same ad hoc network according to a routing forwarding strategy. The special terminal with the effective address of the routing information collecting and forwarding functional entity can calculate the routes reaching all effective terminals and the routing information collecting and forwarding functional entity, if the message needs to be sent, the global planning can be carried out according to the routes of all the effective terminals and the routing information collecting and forwarding functional entity, the optimal route is selected for sending, and the communication efficiency is effectively improved.
Further, the dedicated terminal located outside the heterogeneous network communication area includes:
a receiving module: the system comprises a special terminal and a special network, wherein the special terminal is used for receiving the self-networking state information or other messages sent or forwarded by other special terminals in the same self-networking;
the identification processing module: the special terminal used for judging the ad hoc network state information is an effective terminal: if the ad hoc network state information does not exist in any one of the following three conditions that the information source of the ad hoc network state information comes from a special terminal corresponding to the receiving module, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified and passed, judging that the ad hoc network state information is effective ad hoc network state information, updating a state information table, resetting an aging timer, and marking the special terminal generating the ad hoc network state information as an effective terminal;
a routing module: the system comprises a routing information collection and forwarding functional entity, a routing information collection and forwarding functional entity and a routing information collection and forwarding functional entity, wherein the routing information collection and forwarding functional entity is used for receiving the routing information of the effective terminals and the routing information collection and forwarding functional entity;
a sending module: the system is used for sending self-networking state information to each effective terminal in the same ad hoc network, forwarding the received effective ad hoc network state information to each effective terminal in the same ad hoc network, and sending or forwarding other messages except the ad hoc network state information to each effective terminal in the same ad hoc network according to a routing forwarding strategy. Therefore, the special terminal outside the heterogeneous network communication area can calculate the routes reaching all the effective terminals and the routing information collecting and forwarding functional entity, if the message needs to be sent, the global planning can be carried out according to the routes reaching all the effective terminals and the routing information collecting and forwarding functional entity, the optimal route is selected for sending, and the communication efficiency is effectively improved.
Furthermore, the special terminals located in the heterogeneous network communication area are all special terminals with effective address of the entity configured with the routing information collection and forwarding function, or are divided into two types of special terminals with effective address of the entity configured with the routing information collection and forwarding function and special terminals without effective address of the entity configured with the routing information collection and forwarding function; if a special terminal which is located in the heterogeneous network communication area and is not configured with a valid routing information collecting and forwarding function entity address exists, the structure of the special terminal is the same as that of the special terminal located outside the heterogeneous network communication area. Therefore, the special terminal which is located in the heterogeneous network communication area and is not provided with the effective routing information collecting and forwarding function entity with the effective address can calculate the routes reaching all the effective terminals and the routing information collecting and forwarding function entity, if the message needs to be sent, the global planning can be carried out according to the routes reaching all the effective terminals and the routing information collecting and forwarding function entity, the optimal route is selected for sending, and the communication efficiency is effectively improved.
Has the beneficial effects that: the invention discloses a heterogeneous multi-hop expanded network, which has the following beneficial effects compared with the prior art:
1. the invention utilizes the cooperation of the ad hoc network and the heterogeneous network (namely 2 layers or 3 layers of wired network or wireless network), and effectively makes up the defects of the heterogeneous network by the advantages of independence of infrastructure, multi-hop self-relay, flexibility and the like of the ad hoc network, and expands the communication range of the network; the advantages of large bandwidth, low time delay and high capacity of the heterogeneous network and the advantages of independence of infrastructure, multi-hop self-relay and flexibility of the ad hoc network are effectively combined together, so that the advantages of the two networks are complementary, the communication effect is improved, and high-efficiency transmission, load sharing and cross-domain intercommunication of the network are realized;
2. the routing information collecting and forwarding functional entity and all the special terminals issue self-networking state information outwards, so that each special terminal can receive the self-networking state information of all other special terminals and the routing information collecting and forwarding functional entity, and the routing information collecting and forwarding functional entity can receive the self-networking state information of all the special terminals, so that each special terminal can calculate the routes reaching all other special terminals and the routing information collecting and forwarding functional entity, and the routing information collecting and forwarding functional entity can calculate the routes reaching all the special terminals.
Drawings
Fig. 1 is a schematic diagram of a heterogeneous multi-hop extension network according to an embodiment of the present invention;
fig. 2 is a flowchart of sending an application message from the personal computer 5 to the tablet pc 7 according to the embodiment of the present invention.
Detailed Description
The specific embodiment discloses a heterogeneous multi-hop expanded network, which comprises special terminals located inside and outside a heterogeneous network communication area, wherein the special terminals located inside the heterogeneous network communication area and the special terminals located outside the heterogeneous network communication area form an ad hoc network, a routing information collecting and forwarding functional entity is arranged in the heterogeneous network, the routing information collecting and forwarding functional entity and all the special terminals externally issue self ad hoc network state information, each piece of ad hoc network state information passes through the routing information collecting and forwarding functional entity and all the special terminals through the ad hoc network and the heterogeneous network, so that each special terminal can receive the ad hoc network state information of all other special terminals and routing information collecting and forwarding functional entities, the routing information collecting and forwarding functional entity can receive the ad hoc network state information of all the special terminals, each special terminal and the routing information collecting and forwarding functional entity set a routing table according to the received ad hoc network state information, and send or forward other messages except the ad hoc network state information according to the routing table. The meaning of the heterogeneous network in the present invention is any other 2-layer or 3-layer wired network or wireless network different from the ad hoc network, including a 2-layer wired network, a 2-layer wireless network, a 3-layer wired network, and a 3-layer wireless network. Specifically, the wired network includes a network constructed by matching a tangible cable such as a network cable or an optical fiber with a router, a switch, or the like, and a wired access network provided by an operator, and the like. The wireless network comprises a cellular network, wiFi and other wireless networks.
The self ad hoc network state information of the routing information collecting and forwarding functional entity comprises link information of the routing information collecting and forwarding functional entity reaching a direct effective terminal, state information of the direct effective terminal and self state information of the routing information collecting and forwarding functional entity. The routing information collection and forwarding functional entity can acquire link information, including link state, channel quality, congestion state and the like, reaching the effective terminal directly by using modes such as service detection and the like. The special terminal can select whether to connect with a general terminal, such as a mobile phone, a tablet computer, a personal computer and the like. The self ad hoc network state information of the special terminal comprises self ad hoc network air interface link information, adjacent special terminal information and self state information of the special terminal; if the special terminal is a special terminal which is located in a heterogeneous network communication area and is configured with a routing information collection and forwarding functional entity with an effective address, the ad hoc network state information of the special terminal also comprises routing information collection and forwarding functional entity information and link information reaching the routing information collection and forwarding functional entity. The special terminal which is located in the heterogeneous network communication area and is configured with the effective address of the routing information collection and forwarding functional entity can acquire link information, such as link state, channel quality, congestion state and the like, of the routing information collection and forwarding functional entity through heterogeneous network air interface measurement or service detection and other modes. The self-networking state information of the special terminal which is positioned in the heterogeneous network communication area and is provided with the effective routing information collecting and forwarding function entity address also comprises default routing information. The special terminal which is located in the heterogeneous network communication area and is not configured with the effective routing information collecting and forwarding functional entity address and the special terminal which is located outside the heterogeneous network communication area separate one or more default routing information from the received special terminal ad hoc network state information, calculate the route reaching the default routing information source nodes, and then select the optimal next hop address as the default routing gateway address of the special terminal.
The routing information collection and forwarding functional entity comprises:
a receiving module: the system comprises a special terminal, a heterogeneous network communication area and a routing information collection and forwarding function entity, wherein the special terminal is used for receiving ad hoc network state information or other messages which are sent or forwarded by the special terminal and are positioned in the heterogeneous network communication area and are provided with effective routing information collection and forwarding function entity addresses;
the identification processing module: the system is used for judging whether the ad hoc network state information received by the receiving module is generated by the special terminal sending the ad hoc network state information or other special terminals: if the ad hoc network state information is generated by a special terminal sending the ad hoc network state information, and the ad hoc network state information does not have any one of the following three conditions that an information source of the ad hoc network state information is from a routing information collecting and forwarding functional entity, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified, the ad hoc network state information is judged to be effective ad hoc network state information, a state information table is updated, an aging timer is reset, and the special terminal generating and sending the ad hoc network state information is marked to be a direct effective terminal; if the ad hoc network state information is generated by other special terminals, and the ad hoc network state information does not exist any one of the following three conditions that an information source of the ad hoc network state information is from a routing information collecting and forwarding functional entity, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified and passed, the ad hoc network state information is judged to be effective ad hoc network state information, a state information table is updated, an aging timer is reset, and the other special terminals generating the ad hoc network state information are marked as non-direct effective terminals;
a routing module: the system comprises a router, a network management server and a router, wherein the router is used for calculating routes reaching each direct effective terminal and each indirect effective terminal according to received ad hoc network state information generated by each direct effective terminal and each indirect effective terminal, and formulating a route forwarding strategy;
a sending module: the system is used for sending the self ad-hoc network state information of the routing information collecting and forwarding functional entity to the direct effective terminal, forwarding the received effective ad-hoc network state information to the direct effective terminal, and sending or forwarding other messages except the ad-hoc network state information to the direct effective terminal according to a routing forwarding strategy.
The identification processing module of the routing information collection and forwarding functional entity can also be used for judging whether the aging timer corresponding to the special terminal is overtime or not, if yes, the special terminal is marked as an invalid terminal, the sending module issues invalid terminal related information to all the direct valid terminals, the routing module recalculates routing information reaching each direct valid terminal and each indirect valid terminal, and the routing forwarding strategy is updated. If the heterogeneous network is a cellular network, the routing information collecting and forwarding functional entity may be disposed at a core network gateway.
The special terminals in the heterogeneous network communication area are all special terminals with effective address of the entity with the routing information collection and forwarding function, or are divided into two types of special terminals with effective address of the entity with the routing information collection and forwarding function and special terminals without effective address of the entity with the routing information collection and forwarding function; the special terminal for configuring the effective routing information collection and forwarding functional entity address comprises the following steps:
a receiving module: the self-networking state information or other messages sent or forwarded by the routing information collecting and forwarding functional entity and other special terminals in the same self-networking are received;
the identification processing module: the special terminal used for judging the ad hoc network state information is an effective terminal: if the ad hoc network state information does not exist in any one of the following three conditions that the information source of the ad hoc network state information comes from the special terminal corresponding to the receiving module, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified and passed, judging that the ad hoc network state information is effective ad hoc network state information, updating a state information table, resetting an aging timer, and marking the special terminal generating the ad hoc network state information as an effective terminal;
a routing module: the system comprises a routing information collection and forwarding functional entity, a routing information collection and forwarding functional entity and a routing information collection and forwarding functional entity, wherein the routing information collection and forwarding functional entity is used for receiving the routing information of the effective terminals and the routing information collection and forwarding functional entity;
a sending module: the system is used for sending self-networking state information to the routing information collecting and forwarding functional entity and each effective terminal in the same ad hoc network, forwarding the received effective ad hoc network state information to the routing information collecting and forwarding functional entity and each effective terminal in the same ad hoc network, and sending or forwarding other messages except the ad hoc network state information to the routing information collecting and forwarding functional entity and each effective terminal in the same ad hoc network according to a routing forwarding strategy.
The identification processing module of the special terminal configured with the routing information collection and forwarding functional entity with the effective address can also be used for judging whether the aging timers corresponding to other special terminals are overtime, if yes, the special terminal is marked as an invalid terminal, the sending module issues related information of the invalid terminal to the routing information collection and forwarding functional entity and all the effective terminals in the same ad hoc network, the routing module recalculates the routes reaching the effective terminals and the routing information collection and forwarding functional entity, and updates the routing forwarding strategy.
The special terminal outside the heterogeneous network communication area comprises:
a receiving module: the system comprises a special terminal and a special network, wherein the special terminal is used for receiving the self-networking state information or other messages sent or forwarded by other special terminals in the same self-networking;
the identification processing module: the special terminal used for judging the ad hoc network state information is an effective terminal: if the ad hoc network state information does not exist in any one of the following three conditions that the information source of the ad hoc network state information is from the special terminal corresponding to the receiving module, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified, the ad hoc network state information is judged to be effective ad hoc network state information, a state information table is updated, an aging timer is reset, and the special terminal generating the ad hoc network state information is marked as an effective terminal;
a routing module: the system comprises a routing information collection and forwarding functional entity, a routing information collection and forwarding functional entity and a routing information collection and forwarding functional entity, wherein the routing information collection and forwarding functional entity is used for receiving the state information of the ad hoc network generated by the effective terminals and the routing information collection and forwarding functional entity;
a sending module: the system is used for sending self-networking state information to each effective terminal in the same ad hoc network, forwarding the received effective ad hoc network state information to each effective terminal in the same ad hoc network, and sending or forwarding other messages except the ad hoc network state information to each effective terminal in the same ad hoc network according to a routing forwarding strategy.
The identification processing module of the special terminal outside the heterogeneous network communication area can also be used for judging whether the aging timers corresponding to other special terminals are overtime or not, if yes, the special terminal is marked as an invalid terminal, the sending module issues related information of the invalid terminal to all valid terminals in the same ad hoc network, the routing module recalculates the routes reaching the valid terminals and the routing information collecting and forwarding functional entity, and the routing forwarding strategy is updated. If a special terminal which is located in the heterogeneous network communication area and is not configured with a valid routing information collecting and forwarding functional entity address exists, the structure of the special terminal is the same as that of the special terminal located outside the heterogeneous network communication area.
The heterogeneous network is described as an embodiment using a cellular network:
the general terminals are divided into two types, namely general terminals with cellular network access capability and general terminals without cellular network access capability. For a general terminal with cellular network access capability, if the general terminal is covered by a cellular network, the general terminal is preferentially accessed; otherwise, finding WiFi hotspot access; if no WiFi hotspot is found, the network cannot be accessed. For a general terminal without cellular network access capability, the general terminal can be hung on a special terminal through a general interface and is accessed to a network through the special terminal, otherwise, the general terminal cannot be accessed to the network. The special terminal at least comprises an ad hoc network interface positioned in the receiving module, can selectively support a cellular network interface, and can selectively provide a WiFi hot spot interface and/or a universal interface such as a network interface and the like for peripheral access.
1. Three-layer networking structure
When the network structure in fig. 1 is a three-layer networking structure, the IP addresses of the devices are: the gateway address of the core network 21 is 10.1.254.254/16; the cellular network address of the special terminal 31 is 10.1.1.1, the ad hoc network address is 192.168.254.1/24, and the local network port address is 192.168.1.1/24; the ad hoc network address of the special terminal 32 is 192.168.254.4/24, and the local network port address is 192.168.11.1/24; the cellular network address of the special terminal 33 is 10.1.1.2, the ad hoc network address is 192.168.254.2/24, and the local network port address is 192.168.2.1/24; the ad hoc network address of the special terminal 34 is 192.168.254.5/24, and the local network port address is 192.168.12.1/24; the cellular network address of the special terminal 41 is 10.1.1.3, the ad hoc network address is 192.168.254.3/24, and the local network port address is 192.168.3.1/24; the ad hoc network address of the special terminal 42 is 192.168.254.6/24, and the local network port address is 192.168.13.1/24; the network port address of the personal computer 5 is 192.168.11.100/24; the network port address of the personal computer 6 is 192.168.12.100/24; the network port address of the tablet computer 7 is 192.168.13.100/24. The special terminals 31, 33 and 41 are simultaneously in the coverage area of a cellular network 24, and the cellular network 24 has a base station 23; the special terminals 31, 32, 33, 34 are located in the same ad hoc network subnet 3; the dedicated terminals 41, 42 are located in the same ad hoc network subnet 4; the personal computer 5 is connected to the dedicated terminal 32 through the local network port, the personal computer 6 is connected to the dedicated terminal 34 through the local network port, and the tablet computer 7 is connected to the dedicated terminal 42 through the WiFi.
In the three-layer networking, the special terminals 31, 33 and 41 have the IP addresses of three networks at the same time, the ad hoc network interface and the cellular network interface are effective at the same time, the local network port address is used for terminal addressing and interconnection with the peripheral equipment, and the ad hoc network address is used for ad hoc network interface identification and ad hoc network air interface one-hop forwarding. The default routes of the dedicated terminals 31, 33, 41 are all directed to the cellular network 24, i.e. to the routing information collecting and forwarding function 22 arranged at the gateway of the core network 21. The special terminals 32, 34, 42 only access the ad hoc network, only the ad hoc network interface and the local network port are valid, and only the ad hoc network address and the local network port address are provided.
The following describes the diffusion process of ad hoc network status information by taking the dedicated terminal 32 as an example:
1) The special terminal 32 periodically or event broadcasts the self ad hoc network status information at the ad hoc network interface;
2) After receiving the effective ad hoc network state information from the special terminal 32 through the ad hoc network interface, the special terminal 31 forwards the effective ad hoc network state information in the cellular network 24 and the ad hoc network subnet 3; according to the ad hoc network flooding suppression strategy, forwarding can be carried out only in the cellular network 24, and forwarding is not carried out in the ad hoc network subnet 3, and only effective ad hoc network state information is forwarded to the routing information collecting and forwarding functional entity 22 in the cellular network 24;
3) After receiving the effective ad hoc network state information from the dedicated terminal 32 through the ad hoc network interface, the dedicated terminal 33 forwards the effective ad hoc network state information in the cellular network 24 and the ad hoc network subnet 3; forwarding in the cellular network 24 only needs to forward the effective ad hoc network state information to the routing information collecting and forwarding functional entity 22 according to the ad hoc network flooding suppression strategy;
4) After receiving the effective ad hoc network state information from the dedicated terminal 32 forwarded by the dedicated terminal 33 through the ad hoc network interface, the dedicated terminal 34 forwards the effective ad hoc network state information in the ad hoc network subnet 3; forwarding may or may not be performed according to the ad hoc network flooding suppression strategy;
5) After receiving the effective ad hoc network state information of the dedicated terminal 32, the routing information collecting and forwarding functional entity 22 forwards the effective ad hoc network state information to other direct effective terminals which have accessed the cellular network 24, that is, to the dedicated terminals 33 and 41;
6) After receiving the effective ad hoc network state information from the routing information collecting and forwarding functional entity 22 through the cellular network interface, the dedicated terminal 41 forwards the effective ad hoc network state information in the cellular network 24 and the ad hoc network subnet 4; forwarding can be performed only in the ad hoc network subnet 4 according to the ad hoc network flooding suppression strategy;
7) After receiving the effective ad hoc network state information from the dedicated terminal 32 forwarded by the dedicated terminal 41 through the ad hoc network interface, the dedicated terminal 42 forwards the effective ad hoc network state information in the ad hoc network subnet 4; forwarding may or may not be performed according to the ad hoc flooding suppression policy.
The process of diffusing the state information of the ad hoc network of the other special terminals and the routing information collecting and forwarding functional entity is the same, and is not repeated.
The ad-hoc network status information of the dedicated terminal 32 is shown in the following table:
in the table, "equivalent weight" is a calculation result after considering factors such as link quality, congestion state, etc., and is comparable between the ad hoc network subnet 3 and the cellular network 24. After the equivalent weight value exists, information such as link quality, congestion state and the like can not be transmitted.
The associated network information of the dedicated terminal 32 is as follows:
default routing information of the dedicated terminal 32: none.
The ad hoc network status information of the dedicated terminal 31 is shown in the following table:
the associated network information of the dedicated terminal 31 is as follows:
the default routing information of the dedicated terminal 31 is as follows:
the ad hoc network status information of the other dedicated terminals and the routing information collecting and forwarding functional entity 22 is the same, and will not be described again.
Each dedicated terminal and the routing information collecting and forwarding functional entity 22 calculate a routing table according to the received ad hoc network status information, and the routing table of the dedicated terminal 31 is given as an example below.
2. Two-layer net structure
When the network structure in fig. 1 is a two-layer network structure, the IP addresses of the devices are: the gateway address of the core network 21 is 10.1.254.254/16; the cellular network address of the special terminal 31 is 10.1.1.1, and the ad hoc network address is 192.168.254.1/24; the ad-hoc network address of the dedicated terminal 32 is 192.168.254.4/24; the cellular network address of the special terminal 33 is 10.1.1.2, and the ad hoc network address is 192.168.254.2/24; the ad-hoc network address of the special terminal 34 is 192.168.254.5/24; the cellular network address of the special terminal 41 is 10.1.1.3, and the ad hoc network address is 192.168.254.3/24; the ad-hoc network address of the dedicated terminal 42 is 192.168.254.6/24; the internet access address of the personal computer 5 is 192.168.254.100/24; the internet access address of the personal computer 6 is 192.168.254.101/24; the network port address of the tablet computer 7 is 192.168.254.102/24. The special terminals 31, 33 and 41 are simultaneously in the coverage area of a cellular network 24, and the cellular network 24 has a base station 23; the special terminals 31, 32, 33, 34 are located in the same ad hoc network subnet 3; the dedicated terminals 41, 42 are located in the same ad hoc network subnet 4; the personal computer 5 is connected to the dedicated terminal 32 through the local internet access, the personal computer 6 is connected to the dedicated terminal 34 through the local internet access, and the tablet computer 7 is connected to the dedicated terminal 42 through WiFi.
In the two-layer networking, the special terminals 31, 33 and 41 have the IP addresses of two networks at the same time, the ad hoc network interface and the cellular network interface are effective at the same time, the local network interface does not need to be bound with addresses, the ad hoc network interface and the local network interface are directly connected in two layers, the two layers are configured to be in a bridge connection mode, and share one Mac address and the IP address. The default routes of the dedicated terminals 31, 33, 41 are all directed to the cellular network 24, i.e. to the routing information collecting and forwarding function entity 22 arranged at the gateway of the core network 21. The special terminals 32, 34, 42 only access the ad hoc network, the ad hoc network interface and the local network port are directly connected by two layers, the configuration is in a bridge connection mode, and a Mac address and an IP address are shared. The diffusion process of the ad hoc network state information is the same as three-layer networking, and the details are not repeated here.
The ad-hoc network status information of the dedicated terminal 32 is shown in the following table:
the associated network information of the dedicated terminal 32 is as follows:
the Mac address and the IP address of the personal computer 5 are captured and learned through the ARP protocol, and the dedicated terminal 32 maintains an aging mechanism of the mapping relationship between the IP address and the Mac address of the personal computer 5.
Default routing information of the dedicated terminal 32: none.
Each dedicated terminal and the routing information collecting and forwarding functional entity 22 calculate a routing table according to the received ad hoc network status information, and an ARP mapping table, a forwarding table, and a routing table of the dedicated terminal 31 are given as examples below.
ARP mapping table of the dedicated terminal 31:
forwarding table of the dedicated terminal 31:
routing table of the dedicated terminal 31:
the following gives an example of a process in which the personal computer 5 sends an application message to the tablet computer 7, and includes the following steps:
1) The personal computer 5 checks whether the Mac address corresponding to the tablet computer 7 is known: if so, directly sending an application message at the network port, and turning to the step 4); otherwise, sending an ARP request on the network port, and turning to the step 2);
2) After the special terminal 32 receives the ARP request, if a message sent by the personal computer 5 is received for the first time, the corresponding relation between the IP address of the personal computer 5 and the Mac address is learned, then the special terminal 32 is triggered to be associated with network information updating broadcast once, the message can be sent separately as a part of the ad hoc network state information, the IP address and the Mac address of the personal computer 5 associated with the special terminal 32 are diffused to the whole network, after the special terminal 32 triggers the diffusion of the IP address and the Mac address, whether the corresponding relation between the IP address of the tablet computer 7 and the Mac address is learned or not is judged, if the corresponding relation is learned, an ARP response message is directly constructed to inform the personal computer 5, the personal computer 5 can know the Mac address of the tablet computer 7 after receiving the ARP response message, and the step 1 is carried out, otherwise, the ARP request sent by the special terminal 32 is diffused to the whole network; if the message sent by the personal computer 5 is not received for the first time, the diffusion of the IP address and the Mac address of the personal computer 5 is not carried out, whether the corresponding relation between the IP address and the Mac address of the tablet computer 7 is learned or not is directly judged, if the corresponding relation is learned, an ARP response message is directly constructed to inform the personal computer 5, the Mac address of the tablet computer 7 can be known after the personal computer 5 receives the ARP response message, the step 1 is carried out, and if the corresponding relation is not learned, the ARP request sent by the special terminal 32 is diffused to the whole network; the specific diffusion process refers to the diffusion process of the ad hoc network state information of the dedicated terminal 32 in this specific embodiment, and is not described herein again;
3) After receiving the ARP request of the dedicated terminal 32, the dedicated terminal 42 determines whether the correspondence between the IP address and the Mac address of the tablet computer 7 has been learned: if the forwarding table is learned, the ARP response is directly constructed through unicast, a local forwarding table is searched for and sent to the special terminal 32 hop by hop, and finally the special terminal 32 forwards the ARP response to the personal computer 5 through the network port; if the address resolution request is not learned, the special terminal 42 forwards the ARP request to the tablet computer 7 through WiFi, the tablet computer 7 performs unicast ARP response after receiving the ARP request, the special terminal 42 learns the corresponding relation between the IP address and the Mac address of the tablet computer 7 after receiving the unicast ARP response, the special terminal 42 updates the self associated network information, forwards the ARP response through unicast and triggers one-time updating and diffusion of the associated network information of the special terminal 42, the special terminal 32 forwards the ARP response to the personal computer 5 through a network port after receiving the ARP response, the personal computer 5 can know the Mac address of the tablet computer 7 after receiving the ARP response, and the step 1 is repeated);
4) The routing information collecting and forwarding functional entity 22 and each dedicated terminal forward the application message sent by the personal computer 5 according to its own forwarding table; the forwarding path and frame type are shown in fig. 2.
The above is the process of sending the message from the personal computer 5 to the inside of the network, and the following provides the flow of sending the message from the personal computer 5 to the outside of the network, as follows:
1) When the personal computer 5 finds that the target device is not in the network, the message is sent to the special terminal 32, and the destination address of the Mac frame is the bridging Mac address of the special terminal 32;
2) After receiving the message, the dedicated terminal 32 finds that the Mac address is the self address, and enters a protocol frame to strip the Mac header to obtain a three-layer IP packet; inquiring a routing table according to a target IP in an IP packet header, and if the IP packet is found to need to be forwarded to the special terminal 31 through an ad hoc network interface, packaging the IP packet into a Mac packet, wherein a source Mac address is of the personal computer 5, and a target Mac address is an ad hoc network bridging Mac address of the special terminal 31;
3) After receiving the message, the dedicated terminal 31 queries its own routing table, and if it is found that the message needs to be forwarded to the core network 21, the Mac header of the message is stripped, and only the IP packet is sent to the core network 21 after being encapsulated by the cellular network; the associated indication message type is a 3-layer message;
4) After receiving the message, the routing information collecting and forwarding functional entity 22 located at the gateway of the core network 21 finds that the message is a layer 3 message, and queries its own routing table to forward the message to the outside.
The process of sending the message from the outside to the inside of the network is reversed, and the description is omitted here.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (9)
1. A heterogeneous multi-hop expansion network, comprising: the heterogeneous network communication system comprises special terminals located inside and outside a heterogeneous network communication area, wherein the special terminals located inside the heterogeneous network communication area and the special terminals located outside the heterogeneous network communication area form an ad hoc network, a routing information collecting and forwarding functional entity is arranged in the heterogeneous network, the routing information collecting and forwarding functional entity and all the special terminals externally issue self ad hoc network state information, each piece of ad hoc network state information passes through the ad hoc network and the heterogeneous network and passes through the routing information collecting and forwarding functional entity and all the special terminals, so that each special terminal can receive the ad hoc network state information of all other special terminals and routing information collecting and forwarding functional entities, the routing information collecting and forwarding functional entity can receive the ad hoc network state information of all the special terminals, each special terminal and routing information collecting and forwarding functional entity set a routing table according to the received ad hoc network state information, and send or forward other messages except the ad hoc network state information according to the routing table;
the routing information collection and forwarding functional entity comprises:
a receiving module: the system comprises a special terminal, a heterogeneous network communication area and a routing information collection and forwarding function entity, wherein the special terminal is used for receiving ad hoc network state information or other messages which are sent or forwarded by the special terminal and are positioned in the heterogeneous network communication area and are provided with effective routing information collection and forwarding function entity addresses;
the identification processing module: the system is used for judging whether the ad hoc network state information received by the receiving module is generated by the special terminal sending the ad hoc network state information or other special terminals: if the self-organizing network state information is generated by a special terminal sending the self-organizing network state information, and the self-organizing network state information does not have any one of the following three conditions that the information source of the self-organizing network state information comes from the routing information collecting and forwarding functional entity, the self-organizing network state information is repeatedly received or is outdated, and the self-organizing network state information is not verified to pass, the self-organizing network state information is judged to be effective self-organizing network state information, a state information table is updated, an aging timer is reset, and the special terminal generating and sending the self-organizing network state information is marked to be a direct effective terminal; if the self-organized network state information is generated by other special terminals, and the self-organized network state information does not have any one of the following three conditions that the information source of the self-organized network state information comes from a routing information collecting and forwarding functional entity, the self-organized network state information is repeatedly received or is outdated, and the self-organized network state information is not verified and passed, the self-organized network state information is judged to be effective self-organized network state information, a state information table is updated, an aging timer is reset, and other special terminals generating the self-organized network state information are marked as non-direct effective terminals;
a routing module: the system comprises a router, a network management server and a router, wherein the router is used for calculating routes reaching each direct effective terminal and each indirect effective terminal according to received ad hoc network state information generated by each direct effective terminal and each indirect effective terminal, and formulating a route forwarding strategy;
a sending module: the system is used for sending the self ad-hoc network state information of the routing information collecting and forwarding functional entity to the direct effective terminal, forwarding the received effective ad-hoc network state information to the direct effective terminal, and sending or forwarding other messages except the ad-hoc network state information to the direct effective terminal according to a routing forwarding strategy.
2. The heterogeneous multi-hop expansion network of claim 1, wherein: the self ad hoc network state information of the routing information collecting and forwarding functional entity comprises link information of the routing information collecting and forwarding functional entity reaching a direct effective terminal, state information of the direct effective terminal and self state information of the routing information collecting and forwarding functional entity.
3. The heterogeneous multi-hop expansion network of claim 1, wherein: the identification processing module is further used for judging whether the aging timer corresponding to the special terminal is overtime or not, if yes, the special terminal is marked as an invalid terminal, the sending module issues invalid terminal related information to all the direct valid terminals, the routing module recalculates routing information reaching each direct valid terminal and each indirect valid terminal, and the routing forwarding strategy is updated.
4. The heterogeneous multi-hop expansion network of claim 1, wherein: the special terminal can select whether to connect with the general terminal, and the self ad-hoc network state information of the special terminal comprises the self-ad-hoc network air interface link information, the adjacent special terminal information and the self state information of the special terminal; if the special terminal is a special terminal which is positioned in a heterogeneous network communication area and is provided with a routing information collecting and forwarding functional entity with an effective address, the ad hoc network state information of the special terminal also comprises routing information collecting and forwarding functional entity information and link information reaching the routing information collecting and forwarding functional entity.
5. The heterogeneous multi-hop expansion network of claim 4, wherein: the self-networking state information of the special terminal which is positioned in the heterogeneous network communication area and is provided with the effective routing information collecting and forwarding functional entity address also comprises default routing information.
6. The heterogeneous multi-hop expansion network of claim 5, wherein: the special terminal which is located in the heterogeneous network communication area and is not provided with the effective routing information collecting and forwarding functional entity address and the special terminal which is located outside the heterogeneous network communication area separate one or more default routing information from the received special terminal ad hoc network state information, calculate the route reaching the default routing information source nodes, and then select the optimal next hop address as the default routing gateway address of the special terminal.
7. The heterogeneous multi-hop expansion network of claim 1, wherein: the special terminals in the heterogeneous network communication area are all special terminals with effective address of the entity with the routing information collection and forwarding function, or are divided into two types of special terminals with effective address of the entity with the routing information collection and forwarding function and special terminals without effective address of the entity with the routing information collection and forwarding function; the special terminal for configuring the effective routing information collection and forwarding functional entity address comprises the following steps:
a receiving module: the self-networking state information or other messages sent or forwarded by the routing information collecting and forwarding functional entity and other special terminals in the same self-networking are received;
the identification processing module: the special terminal used for judging the ad hoc network state information is an effective terminal: if the ad hoc network state information does not exist in any one of the following three conditions that the information source of the ad hoc network state information is from a special terminal corresponding to the receiving module, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified, the ad hoc network state information is judged to be effective ad hoc network state information, a state information table is updated, an aging timer is reset, and the special terminal generating the ad hoc network state information is marked as an effective terminal;
a routing module: the system comprises a routing information collection and forwarding functional entity, a routing information collection and forwarding functional entity and a routing information collection and forwarding functional entity, wherein the routing information collection and forwarding functional entity is used for receiving the state information of the ad hoc network generated by the effective terminals and the routing information collection and forwarding functional entity;
a sending module: the self-networking state information is sent to the routing information collecting and forwarding functional entity and each effective terminal in the same ad hoc network, the received effective ad hoc network state information is forwarded to the routing information collecting and forwarding functional entity and each effective terminal in the same ad hoc network, and other messages except the ad hoc network state information are sent or forwarded to the routing information collecting and forwarding functional entity and each effective terminal in the same ad hoc network according to the routing forwarding strategy.
8. The heterogeneous multi-hop augmentation network of claim 1, wherein: the special terminal outside the heterogeneous network communication area comprises:
a receiving module: the system comprises a special terminal and a special network, wherein the special terminal is used for receiving the self-networking state information or other messages sent or forwarded by other special terminals in the same self-networking;
the identification processing module: the special terminal used for judging the ad hoc network state information is an effective terminal: if the ad hoc network state information does not exist in any one of the following three conditions that the information source of the ad hoc network state information is from a special terminal corresponding to the receiving module, the ad hoc network state information is repeatedly received or is outdated, and the ad hoc network state information is not verified, the ad hoc network state information is judged to be effective ad hoc network state information, a state information table is updated, an aging timer is reset, and the special terminal generating the ad hoc network state information is marked as an effective terminal;
a routing module: the system comprises a routing information collection and forwarding functional entity, a routing information collection and forwarding functional entity and a routing information collection and forwarding functional entity, wherein the routing information collection and forwarding functional entity is used for receiving the state information of the ad hoc network generated by the effective terminals and the routing information collection and forwarding functional entity;
a sending module: the system is used for sending self-networking state information to each effective terminal in the same ad hoc network, forwarding the received effective ad hoc network state information to each effective terminal in the same ad hoc network, and sending or forwarding other messages except the ad hoc network state information to each effective terminal in the same ad hoc network according to a routing forwarding strategy.
9. The heterogeneous multi-hop augmentation network of claim 8, wherein: the special terminals in the heterogeneous network communication area are all special terminals with effective address of the entity with the routing information collection and forwarding function, or are divided into two types of special terminals with effective address of the entity with the routing information collection and forwarding function and special terminals without effective address of the entity with the routing information collection and forwarding function; if a special terminal which is located in the heterogeneous network communication area and is not configured with a valid routing information collecting and forwarding functional entity address exists, the structure of the special terminal is the same as that of the special terminal located outside the heterogeneous network communication area.
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