CN100444679C - A Channel Assignment Method in Hybrid Network - Google Patents

Abstract

The invention relates to a channel allocation method in a hybrid network. Specifically: 1) the channel determined in the preset cellular network is used to send the public control information of the mobile ad hoc network; The first traffic channel allocation message for communication; and obtain the second traffic channel allocation message issued by the base station for cellular network communication; 3) The terminal according to the first traffic channel allocation message and the second traffic channel allocation message channel occupancy information, select an idle service channel for calling in the mobile ad hoc network, and initiate a service call request in the preset channel; 4) the terminal is allocated a service channel by the cellular network system to realize communication with the base station Cellular mode call. The present invention can make full use of the existing channel resources of the cellular network to carry out mobile ad hoc network communication without affecting the communication of the cellular network.

Description

A Channel Assignment Method in Hybrid Network

technical field

The invention relates to a channel allocation method of a mixed network system, in particular to a channel allocation method in a mixed network system of a mobile ad hoc network and a cellular network.

Background technique

The network structure of the cellular network is a common network structure of the existing mobile communication system. The centralized wireless channel allocation method is adopted in the cellular network, that is, a central control device such as a base station or a service access point is required. Taking the current GSM and CDMA mobile communication systems as an example, the radio network controller (BSC/RNC) manages and allocates radio resources, and notifies the terminal of the allocated traffic channel through the base station in the downlink common channel.

The mobile ad hoc network is another general mobile communication mode besides the cellular network. The mobile ad hoc network is a multi-hop temporary autonomous system composed of a group of mobile terminals with wireless transceiver devices. The communication system exists without the network infrastructure and is a distributed control network without a center.

The terminal of the mobile ad hoc network has both functions of router and host. When the terminal acts as the host, it runs user-oriented applications. When the terminal acts as a router, it runs the corresponding routing protocol and participates in data packet forwarding and routing according to the routing policy and routing table. maintenance work. In the mobile ad hoc network environment, the wireless communication coverage of each terminal is limited, and two terminals that cannot communicate directly perform data communication by means of packet forwarding from other terminals. Moreover, the mobile ad hoc network terminal transceiver module is symmetrical, and the terminal dynamically obtains the channel through a distributed algorithm, and then communicates. As shown in Figure 1, terminal 4 and terminal 7 cannot communicate directly, terminal 4 can find a path to terminal 7 through the routing algorithm of the mobile ad hoc network, that is, terminal 4 can finally communicate with terminal 7 through the forwarding of terminal 5.

In the mobile ad hoc network, a communication process may be sent by the source terminal, and finally reach the destination terminal through the relay forwarding of n terminals in the middle, so that there is one hop adjacent terminal relative to the source terminal, that is, the source terminal can receive the transmission. The terminal, the two-hop adjacent terminal, the packet of the source terminal can reach the two-hop adjacent terminal after being forwarded by the one-hop adjacent terminal. As shown in FIG. 1 , the one-hop adjacent terminals of terminal 4 are terminal 2 and terminal 5 . The two-hop adjacent terminals of terminal 4 are 1, 3, 6, and 7.

Introducing the mobile ad hoc network communication method into the cellular system will be able to make up for coverage defects, provide P2P (Peer-to-Peer, point-to-point) mode, reduce power consumption, increase capacity, and transfer traffic to alleviate calls caused by capacity saturation in hotspot areas Blocking and switching broken links, and finally make the network highly adaptive and intelligent.

In the hybrid network composed of cellular network and mobile ad hoc network mode, it includes mobile ad hoc network communication mode, cellular network communication mode and hybrid communication mode. The hybrid communication mode refers to the cooperative work of the mobile ad hoc network communication mode and the cellular network communication mode to complete the entire communication process, that is, to finally access the base station through the multi-hop relay of the mobile ad hoc network terminal. Among these three communication methods, the first two methods are relatively mature technologies, while the third communication method is a brand new problem that needs to be studied, and there is no ready-made available solution to solve this problem.

Contents of the invention

The problem to be solved by the present invention is to provide a channel allocation method in a hybrid network composed of mobile ad hoc network and cellular network. The method allocates channel resources in the hybrid network, so that the hybrid communication mode can be finally realized.

In order to solve the problems of the technologies described above, the purpose of the present invention is achieved through the following technical solutions:

1) The channel determined in the preset cellular network is used to send the public control information of the mobile ad hoc network; 2) the terminal in the hybrid network monitors the channel resources of the cellular network in the preset channel for the first mobile ad hoc network communication A traffic channel allocation message; and obtain a second traffic channel allocation message issued by the base station for cellular network communication; 3) The terminal occupies the channel according to the first traffic channel allocation message and the second traffic channel allocation message Information, select an idle service channel for calling in the mobile ad hoc network, and initiate an ad hoc network service call request in the preset channel; 4) The terminal is allocated a service channel by the cellular network system to realize communication with the base station Cellular mode call.

In the above method, 1) the method that the determined channel is used to send the public control information of the mobile ad hoc network is specifically: preset a channel based on frequency band division for the mobile ad hoc network to send the public control information; or, according to the location of the terminal, Different cells, each cell allocates a channel based on time slot or code division for sending public control information of the mobile ad hoc network.

On the basis of the above method, 3) also includes: before the terminal initiates the mobile ad hoc network call, the channel to be occupied is determined in a distributed manner, and the selected channel information is reported to the base station, and after the mobile ad hoc network call is completed, Report the channel release information to the base station. And, the base station can also judge whether the channel use requirement reported by the terminal meets the requirement of system parameters, and if so, send a confirmation message, and the terminal uses the channel to initiate a call in the MANET.

On the basis of the above method, before selecting an idle traffic channel in 3), it further includes: the terminal judges whether the call destination terminal is in the same cell as the terminal, and if not, then negotiates which cell's cellular network channel resources to use to initiate a mobile ad hoc network call .

On the basis of the above method, in 3), the terminal sends the channel occupancy information of the terminal in the preset channel, or sends the channel occupancy information of the terminal in the preset channel and forwards the monitored channel occupancy information.

In the above method, in 2), the base station periodically sends the channel allocation message through the downlink common channel, or the base station sends the channel allocation message according to the request information of the terminal.

As can be seen from the above technical solutions, in the present invention, the mobile ad hoc network and the cellular network share the channel resources of the existing cellular network, so there is no need to divide wireless resources for the communication of the mobile ad hoc network; meanwhile, for the mobile ad hoc network Divide a channel for sending public control information in the mobile ad hoc network, so that the terminal in the mixed network can simultaneously obtain the mobile ad hoc network service channel allocation information and the cellular network service channel allocation information, and select an idle or It is a reusable service channel to realize the communication in the mobile ad hoc network. Therefore, the present invention can make full use of the existing channel resources of the cellular network to carry out the mobile ad hoc network communication without affecting the communication of the cellular network. On the other hand, the technical solution provided by the present invention can continue to use the existing cellular network communication protocol to the greatest extent as a whole, that is, after making minor changes to the existing cellular network protocol, the allocation of channel resources in the hybrid network mode can be realized. Allocation, and further communication in hybrid network mode can be realized.

Further, in the present invention, when a channel for sending public control information is set for the mobile ad hoc network, the terminal can obtain the allocation information of the traffic channel in the mobile ad hoc network and the information of the relevant adjacent nodes on the channel, and then Realize the distributed allocation of available cellular network channels by the mobile ad hoc network. The public channel division method of the present invention can further exert the advantages of the mixed network mode, and can realize functions such as cell network capacity expansion, flow transfer, virtual cell expansion, and coverage blind area reduction.

On the basis of the above method, further, the base station judges whether the channel reported by the terminal meets the requirements of the system parameters. This step will enable the mobile ad hoc network communication and the cellular network communication to multiplex a channel in space. Under the premise of using conditions (such as using parameters such as signal-to-noise ratio as the basis for judgment), the mobile ad hoc network can use the channel currently used by the current cellular network communication to perform communication in the mobile ad hoc network. The method improves system capacity and saves channel resources.

Description of drawings

Figure 1 is a schematic diagram of the communication logic in the mobile ad hoc network;

Fig. 2 is a schematic diagram of the relative positions of the mobile ad hoc network and the cellular network;

Fig. 3 is a schematic diagram of the relative positions of the mobile ad hoc network and the cellular network;

Fig. 4 is a schematic diagram of a hybrid network communication mode;

Fig. 5 is a schematic diagram of channel allocation.

Detailed ways

The invention provides a method for allocating channel resources in a hybrid network mode composed of a mobile ad hoc network and a cellular network. The core idea is: firstly, the available resources are determined jointly by the cellular network and the mobile ad hoc network; the cellular network system (radio network controller) is responsible for the allocation of the cellular network channels, so the terminal can know the channel allocation status of the cellular network from the system; at the same time, Each terminal in the mobile ad hoc network can know the channel resources used by adjacent terminals through carrier sense; therefore, when the mobile ad hoc network is within the coverage of the cellular network, the available channel resources of the hybrid network are mobile ad hoc network and the intersection of idle channels in the cellular network, or, when the mobile ad hoc network part is outside the coverage of the cellular network, the available channel resources of the hybrid network are the union of idle channel resources in the mobile ad hoc network and the cellular network. Furthermore, the cellular network and the mobile ad hoc network jointly allocate channel resources, the terminals directly communicating with the base station are allocated channels by the cellular network, and the multi-hop communication between terminals uses the distributed mode of the mobile ad hoc network for channel allocation.

Based on the above core idea, when the MANET and the cellular network system share the same channel resources, the calls initiated include: pure cellular mode calls between base stations and terminals, pure mobile ad hoc network mode calls between terminals within the mobile ad hoc network Calls, and calls in the mobile ad hoc network mode and the cellular network mode. Figure 2 and Figure 3 are schematic diagrams of the relative positions of the mobile ad hoc network and the cellular network in the hybrid network.

Ad hoc network communication mode: as described in the background technology, in the mobile ad hoc network call mode, the communication process between terminals does not pass through the base station, but is completed in a multi-hop forwarding manner.

Cellular network communication mode: In the communication process between the base station and the terminal, the communication is carried out according to the communication specification of the cellular network, and the channel resources of the cellular network are used, and the allocation of channel resources is carried out according to the wireless resource management protocol.

The hybrid network communication mode: in this mode, the terminal will complete the communication through the mobile ad hoc network and the cellular network;

When a terminal is not in the coverage area of the cellular network, it accesses the cellular network through the multi-hop with the help of the mobile ad hoc network. Terminal 3 in Figure 3, because it is outside the coverage of the cellular network, when it wants to communicate with terminal 6, it cannot communicate directly through the cellular network. Terminals (terminal 5 shown in the figure) that are in the same mobile ad hoc network and within the coverage of the cellular network communicate with terminal 6 through accessing the cellular network through terminal 5 . The above is one of the communication situations in a hybrid network.

In the above communication link, the whole link can be divided into two parts: terminal 3 to terminal 5; and terminal 5 to terminal 6. Among them, the link from terminal 3 to terminal 5 is a pure mobile ad hoc network communication mode. At this time, terminal 3 should initiate a service request to terminal 4 without affecting the communication of the cellular network cell. Similarly, terminal 4 initiates a service request to terminal 5. The normal communication of the cellular network cell cannot be affected when the service request is made. To sum up, in the mixed network mode, the communication between the terminals of the two networks should be realized, and the mutual interference between the terminals should not be caused in the two communication modes.

Taking the communication between the terminal 3 and the terminal 6 in FIG. 3 as an example, the complete core steps of the present invention will be described. That is, it needs to complete the pure mobile ad hoc network communication before connecting to the base station at the last hop, and then realize the communication with the terminal in the cellular network. 1) dividing a common channel for sending control packets in the mobile ad hoc network;

2) The node obtains traffic channel allocation information in the cellular network;

3) The base station issues the allocation of service channels in the cellular network; the content of the broadcast depends on the needs, and may include: channels used by this cell and adjacent cells, ID numbers of this cell and adjacent cells, and allocation of service channels in this cell , channel allocation of adjacent cells, the situation of mobile ad hoc network nodes using traffic channels for communication in each cell, etc.;

The way for the base station to issue the allocation of traffic channels in the cellular network includes: the base station periodically broadcasts on the downlink public channel; or the base station responds to the node's request on the traffic channel;

4) The node listens on the public control channel of the mobile ad hoc network;

Obtain the traffic channel allocation information during the communication of the nodes in the mobile ad hoc network; if the content broadcast by the base station includes the information of the mobile ad hoc network, it only needs to listen to the neighbor node list;

5) The node decides which service channel to use for data transmission according to the information sent by the base station and the information detected; the selected channel should be an idle channel; or no other nodes around the sending node are receiving and no other nodes around the receiving node are selected. The channel sent by the node;

6) The node completes channel allocation on the public control channel of the mobile ad hoc network; including: the sending node inquires whether the receiving node can receive the selected channel; the receiving node confirms and completes the channel allocation;

7) The node notifies the base station of the distribution result; the method includes: jumping to notify the base station; or a node in the entire link notifies the base station;

8) The base station determines whether the channel selected by the mobile ad hoc network node can be used according to the corresponding algorithm, if yes, then confirms to the node; if not, then informs the node to reselect the channel, and repeats steps 5), 6), 7), and 8) ;

9) The node sends service information on the selected channel;

10) After the communication ends, the node reports the channel release information to the base station as needed, and the methods include: jumping to notify the base station; or a certain node notifying the base station;

11) The base station deletes the information of the channel occupied by the node; (if the base station does not broadcast, there is no need to notify the base station to delete).

12) The last hop terminal accesses the base station;

That is, the terminal communicates with the previous hop terminal in the mobile ad hoc network according to the communication process of the pure mobile ad hoc network; and the communication process with the next hop (base station) is in accordance with the provisions of the cellular network protocol. The specific implementation of each step will be described in detail below around the above core steps.

1) A channel is divided in the channel resources of the cellular network as the public control channel of the mobile ad hoc network, which is used to transmit the public control information of the mobile ad hoc network. On the public control channel of the mobile ad hoc network, the terminal can send control information, Including resource application, inter-terminal signaling information and broadcast information, etc.

When the mobile ad hoc network and the cellular network use the same channel resources, the calling terminal needs to notify the receiving terminal of the call initiation. During this process, the influence of the mobile ad hoc network call process on the cellular network cell communication should be avoided as much as possible. Based on the above considerations, the preferred embodiment of the present invention is to divide a channel in the channel resources of the cellular network as the common control channel of the mobile ad hoc network. Compared with using the uplink random access channel and downlink common channel of the existing cellular network to send the public control information of the calling terminal and the receiving terminal, this method can avoid signaling conflicts and waste of resources in the random access channel of the existing cellular network , and avoid interference to other terminals through the cell broadcast channel.

Further, the control channel division method of the preferred mobile ad hoc network in this embodiment has two implementations:

Mode 1: A certain frequency band is preset for the mobile ad hoc network as a public control channel. In this method, no matter whether the nodes are within the coverage of the cell or outside the coverage of the cell, they only need to use a unified common control channel, and do not need to change the channel according to the different cells they are in. The allocation of traffic channels in a hybrid network is a relatively simple approach.

Mode 2: According to the different cells where the terminal is located, a channel is allocated in the cell channels as the common control channel of the mobile ad hoc network. That is, the base station broadcasts the time slot or code channel assigned by the cell to the mobile ad hoc network as a public control channel, and different cells allocate the time slot or code channel for sending the public control information of the mobile ad hoc network according to their own conditions; The entire network uniformly allocates a certain time slot or a certain code channel in each cell as the common control channel of the mobile ad hoc network for each cell.

Referring to Figure 4, when the above-mentioned method 2 is adopted, the terminal outside the cell cannot know through which channel the public control information of the mobile ad hoc network can be obtained, so the communication methods shown in scenarios 1 and 4 in Figure 4 will not be realized; At this time, a default channel needs to be set for the mobile ad hoc network mode. In order to be consistent with the design idea of the MAC protocol in which the mobile ad hoc network uses the cellular traffic channel to communicate, the channel can also be divided into control and traffic channels.

Take method 2 as an example to analyze several typical scenarios:

Scenario 3 in Figure 4: The communication nodes of the mobile ad hoc network are in the same cell. After the node is turned on, it automatically searches for the channel switched to the cell, and uses the public control channel allocated for the mobile ad hoc network in the cell. On the one hand, the node receives the channel allocation channel of the cellular network broadcast by the base station on the downlink public channel, and on the other hand, it listens on the public control channel to obtain the channel usage of the adjacent nodes using the mobile ad hoc network communication method. In this way, the multi-hop communication within the cell described in the present invention can be realized.

Scenario 2 in Figure 4: The communication nodes of the mobile ad hoc network span multiple cells. After the node is turned on, it will switch to the channel of different cells after searching, and use the common control channel of different cells. In order to obtain neighbor node information, a node needs to switch to the public control channel of the neighbor cell in turn to listen in the mobile ad hoc network. Handover can be performed according to the cells given in the node's candidate set. In this way, when a node selects the channel used by the mobile ad hoc network communication, it must first decide to use the channel of the cell where the receiving node is located, or the channel of the cell where the sending node is located. That is to say, the node switches between different cells. Scenario 2 requires two nodes to switch. If in Scenario 5, when the last hop accesses the base station, it is necessary to ensure that the existing normal communication with the base station is not affected when the node is switched.

Figure 4 Scenario 1: The communication node of the mobile ad hoc network is outside the cellular coverage. After the node is turned on, the signal of the base station cannot be found, and it switches to the default working frequency band. In this way, the node only needs to listen to the channel usage of the neighboring nodes on the default working frequency band, and complete the communication on the frequency band. The whole process does not involve the cellular network.

Figure 4 Scenario 4: The communication nodes of the mobile ad hoc network are partly outside the cellular coverage and partly inside the cellular coverage. After the nodes are turned on, some will be switched to the channel of the cell, and some will be on the default channel. If the communication is initiated by a node outside the cell, the node does not have a candidate set, and cannot find neighboring nodes on the corresponding control channel. At this time, all the channels of the cell can be used as the candidate set, switched in turn, and listened to; or require The nodes in the cell periodically send HELLO on the default channel for neighbor node discovery. If the communication is initiated by a node in the cell, after listening in the candidate set, it needs to go to the default channel to listen in order to discover neighboring nodes. After this, the node can decide whether to use the service channel of the cell to complete the communication or to use the default channel to complete the communication.

Based on the above analysis, the channel division method of the above mode 2 configures a common control channel for the mobile ad hoc network in each cell, and sets a default channel for nodes not in the cell and periodically sends HELLO on the default channel. In this way, in order to detect the information of the neighboring nodes, the node needs to switch to the channel of the cell in the candidate set and the default channel to detect respectively. In particular, in order to realize functions such as virtual cell expansion in the hybrid network (Figure 4, scenario 4), and narrowing of blind spots (Figure 4, scenario 1), the channel allocation mechanism is more complicated, and the difficulty is focused on how the nodes allocate the common control channel of the candidate set. Toggle on. Therefore, in this embodiment, the channel division method of mode 1 is preferred to realize the transmission of the common control information of the mobile ad hoc network.

2) The base station broadcasts the channel allocation information of the cellular network, indicating the channel allocation status of the cellular network.

The channel allocation situation can be indicated by Table 1.

Table 1:

Cell ID business channel The channel of this cell Adjacent cell 1 channel Neighboring cell 2 channels Adjacent cell 3 channels Adjacent cell 4 channels Neighboring cell 5 channels Adjacent cell 6 channels Business Channel 1 Terminal 3 rounds Terminal 5 rounds Business channel.. The base station sends to the terminal 5 The base station sends a message to the terminal 9 business channel n The base station sends to the terminal 7 The base station sends a message to the terminal 19

The above table only illustrates the content of the channel allocation information, and does not exclude other list structures.

Referring to the above table, for a cell, the broadcast content can include the channel allocation of this cell and multiple adjacent cells. Assignment information. In addition, the data structure of the issued information should include the following content:

Cell identification (ID number);

The channel of the cell; it can indicate the frequency or codeword used by the channel of the cell, and then the mobile ad hoc network terminal communicating across the cell can know the frequency point that the next hop terminal will use for communication;

Dedicated traffic channel within the cell;

The traffic channel occupied by the determined terminal for communication.

And the delivered channel allocation information may further include the following content:

Determine whether the terminal receives the downlink signal of the base station; this information will facilitate the resource reuse of mobile ad hoc network communication and cellular network communication, that is, if a certain service channel is occupied by uplink, the terminals around the terminal may use this channel Resources for mobile ad hoc network communication; if a service channel is occupied by downlink to send base station information, the channel resource cannot be reused when realizing mobile ad hoc network communication;

Determine whether the terminal communicates in the mobile ad hoc network mode; if a channel is only used for mobile ad hoc network communication, the impact on cellular network communication may not be considered when reusing the channel resources in other mobile ad hoc network communications .

The base station can send the above channel allocation information in two ways: broadcast the above channel allocation information through the downlink public channel, this broadcast form is periodic, and the broadcasting time of each cell is the same; After receiving the request from the terminal, the base station sends it to the terminal through a dedicated traffic channel.

3) The terminal in the ad hoc network monitors the service channel allocation information in the ad hoc network sent by the adjacent terminal on the common control channel of the ad hoc network.

With reference to the following mobile ad hoc network service channel usage list, the channel allocation information content on the public control channel of the mobile ad hoc network is shown; this table is divided into time slots for synchronous terminals in the hybrid network, Asynchronous terminals do not distinguish between time slots. The table below shows the channel usage status and the status of the adjacent terminals of this terminal.

Table 2:

Dedicated traffic channel number adjacent terminal list Channel 1 Channel 2 channel... channel n This terminal Send (community 1) Terminal 2 Receive (community 1) Receive (community 3) Terminal 5 Send (community 2) Terminal 7 Receive (community 4)

The above table only illustrates the content of the channel allocation information, and does not exclude other list structures.

Referring to the above table, the data structure of the information sent by the public control channel of the mobile ad hoc network should include the following content:

The terminal identification (ID);

The dedicated channel occupied by the terminal for communication; a certain channel of a certain cell;

The status of the dedicated channel occupied by the terminal; if the channel is occupied to receive or send information, the duration of the occupied channel, etc.;

Adjacent terminal identification (ID); the number of adjacent terminals included in the list depends on the terminal density;

A dedicated channel occupied by adjacent terminals for communication; a certain channel in a certain cell;

The status of the adjacent terminal occupying the dedicated channel; such as occupying the channel to receive or send information, the duration of the occupied channel, etc.

In addition to the above information content, the present invention does not exclude that the mobile ad hoc network terminal transmits information including other content through the public control channel.

The content of the information in the above list is carried in the control packet used for communication in the mobile ad hoc network, and is also stored in the terminal. The content of the information carried in the control packet may be the channel usage status of the current terminal, or may include the channel usage status of neighboring terminals.

4) Through the above two tables, nodes that need to initiate mobile ad hoc network communication can find and calculate their available channel resources; on the other hand, the base station can also calculate which channel does not meet the use parameter requirements by looking up the table. Furthermore, common channel resource management is realized with the mobile ad hoc network. The following provides a specific embodiment of channel resource allocation in a hybrid network based on the structures of the above two tables. The terminals performing mobile ad hoc network communication include the calling terminal, the forwarding terminal and the calling destination terminal, where the forwarding terminal serves as the receiving terminal and the sending terminal at the same time, while the calling terminal is always the sending terminal during a mobile ad hoc network communication process. The destination terminal is always the answering terminal.

41) The mobile ad hoc network terminal that will initiate a call checks whether its next-hop terminal is in Table 1;

42) If the next-hop terminal is in the first column in Table 1, it means that the two terminals are in the same cell; and then find out which channels the destination terminal of this call can answer (that is, the channel is not currently used for cellular communication) communication, nor for mobile ad hoc network communication);

43) The terminal selects a channel that can be used to initiate a call (that is, the channel is not currently used for cellular communication or mobile ad hoc network communication), and the union of the available channels obtained in steps 42) and 43) is A set of channels available for communication between terminals, and the terminal will select a channel for initiating a call from this set;

44) If there is no next-hop terminal of the calling terminal in the first column in Table 1, further search other columns, then the call in the mobile ad hoc network may be a cross-cell communication at this time, so it needs to be based on each cell in Table 1 The used channel judges whether the sub-districts are of the same frequency or different frequencies. If it is the same frequency, then the terminals used to communicate in the mobile ad hoc network in each sub-district need to be unified on a scrambling code for communication (in the present invention, the implementation mode in the 3G system as an example, but does not exclude the implementation of the present invention in 2G systems); if the frequency differs between cells, the terminals used for mobile ad hoc network communication in each cell should be unified on one frequency point, that is, the frequency needs to be adjusted switch;

In this embodiment, it is assumed that when the terminals are in different cells, each terminal uses the resources of the cell where the calling terminal is located, that is, the calling terminal reports to the base station of the cell, and the receiving terminal does not need to report to the base station of the cell where it is located, because there is no Use the channel of the receiving cell;

45) According to the collection of channels available to the receiving terminal (if the time slot is to be staggered from the time slot of the receiving node communication, including cellular mode and mobile ad hoc network mode), the calling terminal determines the channel used for communication;

46) After searching Table 1, the calling terminal searches Table 2 again. According to the records in Table 2, it can be determined that the adjacent terminal of the calling destination terminal has no channels for sending services, and the adjacent terminals of the calling terminal have no channels for receiving services. Only by taking the intersection of the results found in Table 1 can the channel resources available for communication between the calling terminal and the destination terminal be finally determined;

47) If there is no call destination terminal record in Table 2, the calling terminal directly selects a channel according to its own channel usage and sends a call request on the control channel.

The two tables involved in the above example are two data structures, which are maintained in the terminal. The hybrid network finally determines the available channels according to the contents of the two tables. However, the present invention does not limit the specific table lookup or calculation methods.

On the basis of the above-mentioned embodiments, when the mobile ad hoc network communication will multiplex a channel with the cellular network in space, the terminal should report the channel information to the base station, and the base station judges whether the channel meets the communication parameter requirements to determine Whether the channel can be used for mobile ad hoc network communication. When the channel meets the communication requirements, the base station notifies the mobile ad hoc network terminal to use the channel, otherwise the mobile ad hoc network terminal should reselect the communication channel. The above parameters include the signal-to-noise ratio of the channel. In this embodiment, when the channel allocated by the mobile ad hoc network is not multiplexed with the channel resources of the cellular network, the terminal can directly use the channel without the judgment of the base station, and the present invention does not rule out that the terminal reports the occupied channel information Make the base station record accordingly.

The above is the management method of the channel resources of the present invention, and the allocation status of traffic channels according to the above management method will be described below.

Taking the 3G network as an example, the channel is essentially divided based on time slots and code channels. If the time slot is used as the unit, the mobile ad hoc network can use one or several time slots in a frame as a common control channel , if the code channel is used as the unit, one or several code channels can be used as the common control channel of the mobile ad hoc network. In the following descriptions, the concepts of time slots and code channels are not specifically distinguished, and they are collectively summarized as channels.

With reference to Fig. 5, set one frame as 10ms, wherein channel 1 is used for sending the public control information of the mobile ad hoc network according to the present invention, according to different types of business and different factors such as service quality requirements, then divide the Show channel 3 and channel 6 business channels are used to transmit business packets in the mobile ad hoc network, and the remaining channels are used for cellular communication. As mentioned above, the present invention allows resource reuse of cellular and mobile ad hoc networks, that is, channel 3 and channel 6 shown in the figure can also be used for cellular network communication at the same time when system communication parameter requirements are met.

In addition, the allocation of channels can also adopt the method of dynamic allocation, that is, different from the above-mentioned special division of channel 3 and channel 6 as service channels for mobile ad hoc network communication, all channel resources can be dynamically allocated for mobile ad hoc network communication or In this case, in the management method described above, the terminal should report the channel allocation result of each mobile ad hoc network to the base station, and the base station should register so that it can communicate with the cellular network. Allocate channel resources reasonably to avoid channel occupation conflicts.

The process of the channel allocation method of the present invention is further described below.

1) Terminal 1, which will initiate communication, first learns the situation in Table 1 above by listening to the downlink public channel of the base station; here it can be broadcast periodically by the base station, or it can be that terminal 1 sends a request, and the base station specifically sends a request to the terminal on the traffic channel. 1 Send Table 1 information;

2) Terminal 1 learns the situation in Table 2 by listening to the communication of its own one-hop neighbor node on the public control channel of the mobile ad hoc network: the terminal is on duty or communicating on the downlink public channel, and is on duty at other times in the mobile self-organizing network. On the public control channel of the network; the terminal does not need to listen specifically to obtain the information in Table 2. For terminals that are newly powered on or have just moved into the area, they need to listen to obtain the information in Table 2;

3) The messages on the public control channel intercepted by terminal 1 may have short bursts of data, which are used to interact or maintain control packets of established services. For services using the handshake mechanism, the sending terminal and the receiving terminal are in the control packet It is necessary to negotiate which channel to use and occupy the time, and then Table 2 can be formed. Further, when the mobile ad hoc network adopts power control, Table 2 can also include the power value to be used;

4) After synthesizing all the above messages, terminal 1 can obtain which channels are available for itself and the next hop terminal (terminal 2 in the figure), including idle channels and channels that can realize spatial multiplexing;

5) Terminal 1 needs to select an available service channel according to the resource usage calculated by itself;

6) Terminal 1 initiates a service request to Terminal 2 on the reserved public control channel to coordinate the use of resources, and if Terminal 2 agrees with Terminal 1's selection, it will reply to confirm, otherwise, it will notify Terminal 1 to choose another channel;

7) The process of terminal 2 and terminal 3 is the same, the allocation result of the mobile ad hoc network should be notified to the network (base station), and if there is power control, the used power should also be explained;

The way of notifying the network of the channel allocation result of the mobile ad hoc network can be that the source terminal or the destination terminal notifies the network together after the entire link allocation is completed;

When the terminals are not in the same cell, it is obvious that each terminal needs to report the channel allocation structure related to the cell to its own cell; or, the sending terminal of each hop can notify the base station separately, such as terminal 1 notifying the base station that it communicates with terminal 2 For the channel used, the terminal 2 notifies the base station of the channel it uses to communicate with the terminal 3;

8) After calculation, if the network agrees that the terminal can occupy the reported channel for mobile ad hoc network communication, then the terminal transmits service packets on the predetermined service channel; otherwise, the terminal starts to select channels again.

9) After the mobile ad hoc network communication ends, the mobile ad hoc network terminal releases the channel resource; and, if the mobile ad hoc network channel occupation information is recorded in the network, after the mobile ad hoc network terminal releases the channel resource, it should also The release information is notified to the network, and the network updates its resource usage list.

The above steps can be summarized into 5 processes: allocate traffic channels on the public control channel in the mobile ad hoc network; notify the cellular network of the traffic channel allocation results of the mobile ad hoc network (it can be reported by node 1 and node 2 to the base station respectively, or as shown in the figure As shown, the node 1 uniformly reports to the base station); transmits data services on the traffic channel; releases the channel in the mobile ad hoc network; notifies the release of the cellular network traffic channel (it can be that after the entire link is released, the node 1 uniformly notifies the base station to release the channel, It may also be that each hop node notifies the base station separately).

The channel allocation method in a hybrid network provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the present invention. method and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be understood as Limitations on the Invention.

Claims (9)

1, a kind of method for channel allocation of hybrid network system is used for realizing it is characterized in that the channel allocation of the hybrid network that mobile ad hoc network and Cellular Networks constitute:

1) presets the common control information that the channel of determining in the Cellular Networks is used to send mobile ad hoc network;

2) terminal is used for first traffic channel assignment message that mobile ad hoc network is communicated by letter in the hybrid network in the described channel-monitoring Cellular Networks channel resource that presets; And obtain second traffic channel assignment message that is used for cellular network communication that the base station issues;

3) described terminal is according to the channel occupancy information in described first traffic channel assignment message and second traffic channel assignment message, select idle Traffic Channel to be used for calling out in the mobile ad hoc network, and in the described channel that presets, initiate the MANET service call request;

4) described terminal realizes the Cellular Networks call by pattern with the base station by Cellular Networks system assignment Traffic Channel.

2, the method for channel allocation of hybrid network system as claimed in claim 1 is characterized in that: 1) be specially:

For presetting the channel of dividing based on frequency range, mobile ad hoc network is used to send common control information.

3, the method for channel allocation of hybrid network system as claimed in claim 1 is characterized in that:

1) be specially difference according to terminal sub-district of living in, the channel that one of each cell allocation is divided based on time slot or coding is used to send the common control information of mobile ad hoc network.

4, the method for channel allocation of hybrid network system as claimed in claim 1 is characterized in that:

3) initiate the channel that will take by the distributed way decision before mobile ad hoc network is called out in terminal in, and give the base station, and the information that will discharge channel after the mobile ad hoc network calling is finished reports the base station selected reporting channel information.

5, further comprise the method for channel allocation of hybrid network system as claimed in claim 4 is characterized in that, 3):

The base station judges whether the channel instructions for use of described terminal to report satisfies the requirement of system parameters, if satisfy, then sends acknowledge message, and this terminal uses this channel to initiate to call out in the mobile ad hoc network.

6, the method for channel allocation of hybrid network system as claimed in claim 1 is characterized in that:

3) selecting idle business channel to take a step forward in comprises: whether described terminal judges call intent terminal is in same sub-district with this terminal, if not, then consults to use the Cellular Networks channel resource initiation mobile ad hoc network of which sub-district to call out.

7, as the method for channel allocation of each described hybrid network system of claim 1 to 6, it is characterized in that:

3) comprise further in that terminal sends this terminal channel occupied information in the described channel that presets, or, the channel occupancy information that this terminal channel occupied information and forwarding listen in the described channel that presets, sent.

8, as the method for channel allocation of each described hybrid network system of claim 1 to 6, it is characterized in that:

2) base station periodically issues described second channel assignment messages by common down channel in.

9, as the method for channel allocation of each described hybrid network system of claim 1 to 6, it is characterized in that:

2) base station issues described second channel assignment messages according to the solicited message of terminal in.

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