CN103139712B - A kind of zone digit trunked communication system is anti-ruins recombination method - Google Patents

Abstract

The invention discloses an anti-destroy recombination method for a regional digital trunking communication system, comprising the following steps: (1) integrated design of base station terminals; (2) terminal status reporting; (3) backup base station decision-making; (4) base station failure monitoring; (5) Backup base station upgrade strategy; (6) Mobile user re-registration. The invention has fast response speed, that is, the starting condition is established on the judgment of the physical channel, and the reorganization process is started as long as it is confirmed that the time reference information of the base station has been lost. Since the period of the base station sending the time reference is generally at the second level or less, the system generally responds within one minute after the base station fails. At the same time, the reorganization speed of the present invention is fast, because the system has completed the selection of the backup base station before the base station fails, and after the base station fails, the upgrade of the backup base station is carried out automatically without manual intervention, so the reorganization speed is very fast, and the end users who withdraw from the network are very fast You can re-register to the network.

Description

A kind of invulnerable recombination method of regional digital trunking communication system

technical field

The invention relates to the technical field of wireless communication, in particular to an indestructible recombination method of a regional digital trunking communication system.

Background technique

The regional digital trunking communication system belongs to the trunking mobile communication system. The central station centrally controls the allocation of wireless resources. The wireless resources can be allocated on demand, which greatly improves the utilization of wireless resources. The network scale can be dynamically configured and has strong flexibility. In actual use, the mobile station needs to randomly access channels and apply for channel resources. The trunking communication system generally allocates dedicated signaling channels for mobile users to compete for, and when users successfully access, allocates dedicated traffic channels for service transmission according to requirements. Since the user access channel and business communication need to be carried out through the central station, the role of the central station equipment in the system is very important.

In the Adhoc network, each node has a relatively equal status, and they all have terminal and routing functions at the same time. A certain negotiation strategy is adopted to preset the backup master station in advance. After the master station is destroyed or fails, it can be automatically upgraded in a short time. The master station maintains synchronization within the subnet.

The mobile communication system adopts cellular technology and deploys multiple base stations in the coverage area. User terminal equipment can be connected to the system at any time. After individual base stations fail, users can reconnect to the network when moving to other base station areas.

In the traditional trunking communication system, due to the relative complexity of the center station equipment, it is difficult to quickly complete the establishment of a new center station when the center station fails. Some cluster systems have an off-network direct function, which is mainly used for communication when individual nodes are far away from the central station, and cannot form a cluster network with a certain coverage.

At present, the researches on the invulnerability of wireless communication are mostly focused on the strengthening of the peripheral defense of the ad hoc network system and the increase of communication routing nodes, and there is a lack of systematic research on the functional invulnerability of the regional trunking communication system. With the advancement of technology, a flexible and miniaturized trunking communication system has emerged on the basis of traditional trunking communication technology, and the networking is also faster. The weak invulnerability of traditional cluster communication can no longer meet the needs of users.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages and deficiencies of the prior art, and provide a method for recombination of an area digital trunking communication system with short response time and fast recombination speed.

Another object of the present invention is to provide a multi-level regional digital trunking communication system invulnerable reorganization method.

In order to achieve the above-mentioned first purpose, the present invention adopts the following technical solutions:

The present invention provides an anti-destructive recombination method for a regional digital trunking communication system, comprising the following steps:

S1. The integrated design of the base station and terminal. The communication equipment has both the terminal protocol stack and the base station protocol stack. Different protocol stacks are loaded according to different roles. The vehicle-mounted terminal and the base station equipment adopt the same form and have the same coverage;

S2. Report the terminal status. As a terminal user, after registering on the network, provide the local status to the base station from time to time;

S3, backup base station decision-making, the base station decides the backup base station according to the status information reported by the registered user, and sends it out; the decision-making method is to determine the optional user according to the location information and maximum power, and then determine the final backup base station according to the signal quality of the receiving base station;

S4. Base station failure monitoring. The base station radio station regularly sends time reference information. Both the backup base station and ordinary users monitor the status of the base station in real time. If the time reference information is not received for N times, it enters the state of withdrawing from the network and considers the base station to be invalid;

S5, the backup base station upgrade strategy, after the backup base station judges that the base station is invalid, it automatically upgrades to a base station, starts the base station protocol stack, sends a new time reference, and authenticates the mobile users who require registration;

S6. The mobile user re-registers. After the mobile user determines that the base station is invalid, it waits for the time interval t of sending the time reference for M times. If new base station information is received during the period, the mobile user re-registers.

In order to achieve the above-mentioned second purpose, the present invention further includes a takeover strategy and an off-network direct strategy, specifically as follows:

Takeover strategy, if the mobile station does not receive new base station information within M*t time, it will consider that there is no backup base station available in the subnet or the backup base station cannot cover the node, and start the takeover search phase, every P *t Time to rotate the search of adjacent cells once. The information of adjacent cells is judged or preset according to the information sent by the base station. If the time reference can be received on the channel of a certain cell, it will re-enter the network, and the base station of this cell will take over the local area. node;

Off-network straight-through strategy, if the upgrade strategy and takeover strategy of the backup base station fail, that is, the mobile user cannot receive new base station information or search for a new cell, then return to the original cell, enter the off-network direct state, and send before each transmission Temporary time base, if a user is not synchronized, the call can be communicated in the same way after receiving the call.

Preferably, in step S2, said providing the status of the device to the base station includes signal strength of the base station, maximum power of the device and location information.

Preferably, in step S3, the decision of the backup base station is specifically:

S31. Determine the location information. The base station calculates the relative location matrix of the node I in the subnet according to the location information. If the location information is P, then the location information P=(Lat, Lgt), where Lat is latitude information, Lgt is longitude information;

S32. Estimating the maximum coverage DI _max of the node according to the maximum power reported by the node, where the maximum power refers to the highest level of power available to the mobile user;

S33, calculating the coverage rate Ri=Ni/Nt of node I, wherein Ni is the number of nodes of D(i, j)<DI _max , and Nt is the total number of registered users in the network; if Ri exceeds an acceptable threshold Rs, then Mark node I as an alternative base station;

S34. During network construction, a set of candidate base stations is generated by planning and deploying node positions;

S35. The base station selects the terminal with the highest received base station signal quality LQ from the set of candidate base stations as the backup base station, and announces in the downlink time slot.

Preferably, in step S35, the signal quality LQ of the receiving base station refers to the bit error rate calculated by the terminal device after parsing the received signal. The higher the bit error rate, the worse the signal quality, and the LQ is represented by a value between 0 and 9 , the larger the value, the better the signal.

Preferably, in step S35, if there are multiple same terminal users, selection is made according to coverage and registration sequence.

Preferably, after the backup base station loses the base station signal, the upgrade should not be performed immediately, but should be delayed for a period of time. If the time reference of the base station cannot be received for N consecutive times, it is judged that the base station is invalid.

Preferably, in step S1, the communication device has both a terminal protocol and a base station protocol. When the communication device functions as a base station, both protocols are loaded at the same time, and when the communication device functions as a mobile terminal, only the terminal protocol is loaded.

Preferably, in step S2, the reporting state information is reported in the manner of service entrainment, and the service entrainment is specifically: when a node has a communication service that needs to access a channel, if the communication signaling does not fill up the occupied time slot, then The state information can be entrained in the time slot, that is, the entrainment scheme is selected according to the remaining capacity of a single time slot. If the capacity is large, the complete state information is entrained, and if the capacity is small, only part of the state information that has changed is selected.

Compared with the prior art, the present invention has the following advantages and effects:

1. Fast response speed: the starting condition of this method is based on the judgment of the physical channel, as long as it is confirmed that the time reference information of the base station has been lost, the reorganization process is started. Since the period of the base station sending the time reference is generally at the second level or less, the system generally responds within one minute after the base station fails.

2. Fast reorganization speed: Since the system has completed the selection of the backup base station before the base station fails, after the base station fails, the upgrade of the backup base station is carried out automatically without manual intervention, so the reorganization speed is very fast, and the end users who withdraw from the network will soon You can re-register to join the network.

3. Multi-level survivability means: the system has a backup base station, nearby takeover, off-network direct access, three-level survivability and reorganization means, with strong survivability.

4. Choose the best backup base station: The decision-making algorithm comprehensively utilizes multiple factors such as node physical location, equipment status, and link quality, and the possibility of selecting the best backup base station is high.

5 Low cost of invulnerability: the backup base station selected by this method is an ordinary user, and there is no need to add an additional pure backup device, which reduces the cost of invulnerability. At the same time, because the backup base station and the base station are generally located in different locations, the possibility of being destroyed at the same time is reduced .

Description of drawings

Fig. 1 is a flowchart of the indestructible recombination method of the present invention;

Fig. 2 is the election flowchart of backup base station among the present invention;

Fig. 3 is a flow chart of information reported by end users in the present invention;

Fig. 4 is a flow chart of upgrading a backup base station to a base station in the present invention;

Fig. 5 is a deployment diagram of the embodiment of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example

As shown in Fig. 1, the present embodiment is a method for invulnerability and reorganization of a regional digital trunking communication system, including the following steps: 1) integrated design of base station terminals; (2) terminal status reporting; (3) backup base station decision-making; (4) ) base station failure monitoring; (5) backup base station upgrade strategy; (6) mobile users re-register, if there is a backup base station, the mobile user can search for the network again; (7) takeover strategy, if there is no backup base station, the mobile user can poll Nearby cells, if a response is received, can be taken over by neighboring cells; (8) Off-network direct strategy, if the backup base station upgrade strategy and takeover strategy both fail, that is, mobile users cannot receive new base station information and cannot search for new cells , return to the original cell and enter the off-network direct state.

As shown in Figure 5, this embodiment consists of a base station 1, a base station 2, and a number of mobile terminals. The base station 1, base station 2, and mobile terminals are all single-channel vehicle-mounted stations, and their coverage areas are basically the same. The number of mobile terminals can be configured according to needs and the capacity of the base station. In this example, five mobile terminals are taken as an example for illustration.

As shown in Fig. 2, Fig. 3 and Fig. 4, the specific analysis of the anti-destructive reorganization technology of the regional digital trunking communication system in this embodiment is carried out below, including the following steps:

(1) The communication equipment of base station 1, base station 2, and each mobile terminal (M1-1~M1-5) has both a terminal protocol stack and a base station protocol stack. When serving as a base station, the two protocol stacks are loaded at the same time. When moving the terminal, only the terminal protocol stack is loaded. The cell preset by each mobile terminal is base station 1, and after receiving the time reference information, it registers and joins the network.

(2) The terminal reports the state of the machine: the end user starts to report the state of the machine after the node is in a relatively stable state. The reporting time adopts a combination of periodic reporting and triggered reporting. The more resources are frequently occupied, the easier it is to affect normal communication; the longer the reporting period, the slower the update of subnet information, the more likely it will lead to wrong decision-making. In order not to affect the normal communication as much as possible, the state information can also be reported in the way of service entrainment. The service entrainment is specifically: when a node has a communication service and needs to access the channel, if the communication signaling does not fill up the occupied time slot, Then the state information can be entrained in the time slot. In the specific implementation, the entrainment scheme is selected according to the remaining capacity of a single time slot. If the capacity is large, the complete state information is entrained; if the capacity is small, only part of the state information with changes is selected. . . Since the power generally does not change, the position information and signal quality change frequently, so the power is only reported when the power changes, and other information is reported only after the change exceeds a certain range or is stable.

(3) Backup base station decision: In this example, M1-3 and M1-4 use high power, M1-1, M1-2, and M1-5 use low power, M1-3 receives a base station signal quality of 9, and M1- 4 The signal quality of the receiving base station is 5. According to the status information reported by each terminal, the relative position matrix and maximum coverage of each node are obtained. As shown in Table 1, assuming that Rs=70%, then [SEL]={M1-3, M1-4}, since the signal quality of the receiving base station of M1-3 is obviously better than that of M1-4, so M1-3 is selected as the backup base station .

Table 1 Relative position matrix

(4) Base station failure monitoring: In this embodiment, the base station sends time reference information (simultaneous broadcast) every 3 seconds. If the mobile terminal fails to receive the information for 3 times (about 9 seconds), it considers that the base station has failed and starts to start restructuring process.

(5) The backup base station M1-3 fails to receive the base station information for 3 consecutive times, and immediately exits the network. According to the user settings, if the user allows the system to automatically upgrade, the base station protocol stack of the machine will be started, and the operator will be prompted that the machine will be upgraded to a base station, and the simultaneous broadcast will be sent periodically; A base station failure warning is issued, and the user manually sets the device as a base station.

(6) For general mobile users, if it is detected that the base station fails, it will continue to wait for 10 times (ie M=10) to search for reference information sent by the backup base station. If the user sets it to manual search, the terminal user will stay in the original channel to search after logging out, until the user manually modifies the channel.

The reason for adding the manual operation function in steps (5) and (6) is that the user may require the system to be silent for a period of time during actual use. At this time, the base station stops sending reference information, and the mobile terminal temporarily withdraws from the network, but the system should not be reorganized . Subsequent steps are all steps in the case of automatic reorganization. In this embodiment, they are all set to the automatic reorganization mode, and the mobile users M1-1, M1-4, and M1-5 all search for the reference information of the community within 30 seconds, re-register and join the network, and M1-2 is in the new base station M1- 3 Outside the coverage area, you cannot re-register to the community.

(7) Terminal user takeover: If the mobile user does not receive new base station information within 30*3=90 seconds, it is considered that there is no backup base station available in the subnet or the backup base station cannot cover the node, and starts to start In the takeover search phase, the search for adjacent cells is rotated every 6*3=18 seconds (there is only one adjacent cell in this embodiment: base station 2). In this embodiment, M1-2 can receive the time reference on the channel of base station 2, then re-enter the network, and base station 2 takes over the mobile terminal M1-2 of base station 1;

(8) Off-network direct connection: If both M1-3 and M1-4 are changed to low-power transmission, then there is no suitable backup base station in the network. After registering into the network, other mobile users will return to the original channel because they cannot find the adjacent base station. When offline users need to send services, they directly enter the offline direct mode to send, and return to the logout search state after sending. For offline users, you can search for the time reference information of the base station, or search for the temporary synchronization information sent by the off-network direct station.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (10)

1. zone digit trunked communication system is anti-ruins a recombination method, it is characterized in that, comprises the steps:

S1, base station terminal integrated design, have terminal protocol stack and base station protocol stack simultaneously in communication equipment, load different protocol stacks according to role's difference, car-mounted terminal and base station equipment adopt identical form, have identical coverage;

S2, SOT state of termination report, and as terminal use, irregularly provide local state to base station after login network access;

S3, backup base station to determine, the state information that base station reports according to registered user, decision-making goes out to back up base station and issues; Decision-making technique is according to positional information and maximum power determination selectable user, then determines final backup base station according to base station signal quality;

S4, base station failure are monitored, the regular transmitting time reference information of base radio, and backup base station and the equal Real-Time Monitoring base station state of domestic consumer, if can not receive time reference information for N time, just enters logout state, think base station failure;

S5, backup upgrading base station strategy, after backup base station judges base station failure, be automatically upgraded to base-station, start base station protocol stack, send new time reference information, to requiring that the terminal use registered carries out authentication;

S6, terminal use re-register, and after terminal use judges base station failure, then wait for M time reference access time interval t, if period receives new base station information, then re-start registration.

2. zone digit trunked communication system according to claim 1 is anti-ruins recombination method, it is characterized in that, comprise takeover strategy further, if terminal does not again receive new base station information within the M*t time, then think the base station of not backed up in subnet can with or backup base station cannot cover terminal, start to start the adapter search phase, every the search of a P*t time rotation adjacent cells, adjacent cells information carries out judging according to the information that base station issues or preset, if time reference information can be received on the channel of certain community, then again network, the base station adapter terminal of this community.

3. zone digit trunked communication system according to claim 2 is anti-ruins recombination method, it is characterized in that, also comprise network-off direct-passing strategy, when backup upgrading base station strategy and takeover strategy are all failed, namely terminal use can not receive new base station information and also searches for less than new community, then return former community, enter network-off direct-passing state, send interim time reference information before each transmission, if there is user not synchronous, can communicate in the same way after receiving calling.

4. zone digit trunked communication system according to claim 1 is anti-ruins recombination method, and it is characterized in that, in step S2, the described state of the machine that provides to base station comprises base station signal strength, the machine maximum power and positional information.

5. the zone digit trunked communication system according to any one of claim 1-4 is anti-ruins recombination method, and it is characterized in that, in step S3, described backup base station to determine is specially:

S31, determine positional information, base-station according to the relative position matrix of this positional information calculation node I in subnet, if described positional information is P, then positional information P=(Lat, Lgt), wherein Lat is latitude information, and Lgt is longitude information;

S32, the maximum power reported according to node, estimate its maximum coverage range DI _max, described maximum power refers to the most high-grade power that terminal use can adopt;

The coverage rate Ri=Ni/Nt of S33, computing node I, wherein Ni is D (i, j) <DI _maxnode number, Nt for net in registered user sum; If node I more than an acceptable threshold value Rs, is then designated as candidate BS by Ri;

S34, When building their networks, by planning and disposing node location, produce candidate BS set;

S35, base station are received the maximum terminal of base station signal quality LQ as backup base station according to selecting in candidate BS set, and are noticed at descending time slot.

6. zone digit trunked communication system according to claim 5 is anti-ruins recombination method, it is characterized in that, in step S35, described receipts base station signal quality LQ refers to that terminal equipment calculates the error rate after resolving the signal received, the error rate is higher, signal quality is poorer, and LQ passes through the numeric representation between 0 ~ 9, and the larger expression signal of numerical value is better.

7. zone digit trunked communication system according to claim 5 is anti-ruins recombination method, it is characterized in that, in step S35, if there are identical multiple terminal uses, then selects according to coverage rate and registration order.

8. zone digit trunked communication system according to claim 5 is anti-ruins recombination method, it is characterized in that, after backup base station loses base station signal, do not upgrade immediately, should postpone to wait for a period of time, if the time reference information of N continuous time base station all cannot receive, then judge base station failure.

9. zone digit trunked communication system according to claim 1 is anti-ruins recombination method, it is characterized in that, in step S1, the existing terminal protocol of described communication equipment, have base station protocol again, communication equipment is when as base station, and two kinds of agreements load simultaneously, communication equipment, when as mobile terminal, only loads terminal protocol.

10. zone digit trunked communication system according to claim 1 is anti-ruins recombination method, it is characterized in that, in step S2, the mode that uploaded state information adopts business to carry secretly reports, described business is carried secretly and is specially: when certain node has communication service to need to access channel, if communication signaling does not fill up the time slot taken, then can entrainment state information namely select to carry scheme secretly according to the residual capacity of single time slot in a slot, if capacity is comparatively large, carry full state information secretly, if capacity is less, then select the vicissitudinous state information of an entrainment portions.