WO2021169748A1

WO2021169748A1 - Network-based method and system for dect resource coordination

Info

Publication number: WO2021169748A1
Application number: PCT/CN2021/074823
Authority: WO
Inventors: 刘元龙
Original assignee: 厦门亿联网络技术股份有限公司
Priority date: 2020-02-26
Filing date: 2021-02-02
Publication date: 2021-09-02
Also published as: CN111464996B; CN111464996A

Abstract

The present invention relates to the field of DECT. Disclosed are a network-based method and system for DECT resource coordination. With respect to the problem found in the prior art in which the collection and processing of channel resources in a DECT roaming system rely solely on base stations themselves and done only by means of the inertia of radio transmission, thus easily resulting in the problem of synchronization instability when system conflicts and system interference are severe, provided in the present invention are the network-based method and system for DECT resource coordination: a base station marks neighboring base stations via a network; the neighboring base stations transmit resource information of selves to each other; the base station determines, on the basis of the resource information received, whether a corresponding channel is idling; a handheld, when switching base stations, selects via the resource information of the neighboring base stations a base station having an idling resource, thus increasing the resource use efficiency of the roaming system, and reducing the probability of resource conflicts. When the base stations are synchronizing, based on radio transmission, the network is additionally utilized to simultaneously transmit channel change information, thus improving the reliability of inter-base station synchronization, and increasing the interference resistance of the system.

Description

A network-based DECT resource coordination method and system

Technical field

The present invention relates to the field of DECT, and more specifically, to a method and system for network-based DECT resource coordination.

Background technique

Digital Enhanced Cordless Telecommunications (Digital Enhanced Cordless Telecommunications, abbreviated as DECT), is a digital communication standard, mainly used to develop cordless telephone systems. The DECT protocol is a standard formulated by the European Telecommunications Standards Institute. It is mainly used in home or small office systems, but it is also used in the PBX systems of many medium and large enterprises.

In the traditional abnormality monitoring technical solution, one monitoring host monitors multiple handle devices, and it is prone to problems such as data loss due to excessive transmission distance and failure of the handle device due to abnormality of the monitoring host. Several handle devices are connected to a monitoring host. The handle device sends data to the monitoring host or receives data from the monitoring host according to the protocol. After receiving the data, the interface of the handle device displays relevant information. However, once multiple handle devices operate and report data at the same time, there is too much event information, the monitoring host is too late to process, or the received data is lost, which will cause some handle devices to fail to receive relevant information responses.

The DECT system, that is, the digital enhanced cordless communication system, is a standard formulated by the European Telecommunications Standards Association. In the DECT roaming system, it usually contains multiple Bases and multiple handles. The roaming system is a DECT cluster, and the handles can be between multiple Bases. Roaming DECT system. Base is the fixed end of the device in the DECT system, similar to the base station of a mobile phone, and the handle is a wireless device connected to the Base, similar to a mobile phone, also called Handset or HS for short.

Clock synchronization needs to be performed between Bases, idle channels need to be used to send Dummy, which is the channel for Base to send broadcast signals; handles need to use idle channels to establish calls and so on. And all of this is usually done independently through each Base, receiving air data through the Base, completing clock synchronization; periodically detecting air channel resources to avoid channel resource conflicts; and implementing conflict handling.

In the prior art DECT roaming system, the collection and processing of Base channel resources only relies on each Base itself. The wireless information, such as Dummy location information, is only transmitted through the inertial method of wireless, which will cause the following problems:

(1) Each Base can only recognize conflicts by checking the air channel resources on its own; it cannot perceive the channel resource usage of other neighboring Bases in advance.

(2) The handle in the DECT roaming system can only receive the channel resource status of the currently connected Base and the channel resource usage detected by itself, and cannot know the channel resource usage of other Bases in advance. Therefore, it is impossible to avoid those Bases that have no free resources and waste time trying.

(3) Clock synchronization is required between Bases. Slave Base receives synchronization information through the Dummy channel of Master Base. Master Base is the main base station. It specifically refers to the base that provides the clock synchronization source, that is, the base that provides the dummy signal. Slave Base is From the base station, specifically refers to the Base synchronized to the Master. If the Master Base needs to change the Dummy channel due to factors such as interference, it can only notify the Slave Base through the old Dummy channel and let it switch to the new channel to receive synchronization information. However, the notification of the change message through the old Dummy only lasts 640ms. If the interference is serious and the Slave Base does not receive the change information, the Slave Base will not be able to maintain the data reception, which will cause the disconnection problem.

Summary of the invention

1. Technical problems to be solved

In view of the problems in the prior art, the collection and processing of channel resources in the DECT roaming system only relies on each base station itself, and the wireless information is only transmitted through the inertial method, which is likely to cause system conflicts, waste of trial time, and insufficient synchronization when system interference is serious. The present invention provides a network-based DECT resource coordination method and system, which can improve the resource usage efficiency of the roaming system, reduce the probability of resource conflicts, and improve the system's anti-interference ability.

2. Technical solution

The purpose of the present invention is achieved through the following technical solutions.

First, explain the terms involved in the present invention:

DECT: Digital Enhanced Cordless Telecommunications;

Base: The fixed terminal of DECT equipment, a base station similar to a mobile phone;

Handle: a wireless device connected to Base, similar to a mobile phone, also called Handset or HS for short;

Slot: The time slice in the time division direction of DECT. A slot on a certain frequency represents a channel;

Roaming system: DECT cluster, a DECT system where the handle can roam between multiple Bases;

Dummy: The channel through which Base sends broadcast signals;

Traffic: the air connection established between the Base and the handle;

Master: This specifically refers to the Base that provides the clock synchronization source, that is, the Base that provides the Dummy signal;

Slave: This specifically refers to the Base synchronized to the Master;

RSSI: Received Signal Strength Indication;

RFPI: Radio Fixed Part Identity, wireless fixed port identity, similar to MAC address, sent by the base station, can be identified by all DECT portable terminals, and provides information about PABX (PAPI) identity and access authority and base station (RPN);

Synchronization level: refers to the priority of the base that provides clock synchronization information. The highest priority base does not need to synchronize with other bases, and all other bases in the system are synchronized with it.

A network-based DECT resource coordination method, applied to a DECT roaming system, the base station selects and marks neighboring base stations through the network, and the neighboring base stations send their own resource information to each other, and the base station selects a channel or synchronizes base station information according to the received information. The invention uses the network to search and collect the available resources of any base station and its neighboring base stations, and provide them to the base station and handles, reduce the probability of resource conflicts, and improve resource utilization efficiency; the invention also improves the anti-interference ability of clock synchronization between base stations through the network , Improve the reliability of synchronization between base stations.

Furthermore, the base station searches for surrounding base stations by checking the channel, and the base station judges whether the searched is a neighboring base station according to the received signal strength. The base station searches for neighboring base stations, sequentially checks and searches for each channel to collect surrounding base stations, uses the address information in the channel to determine which base stations are sending data in the channel, and then determines whether the two base stations belong to the same DECT roaming system.

Furthermore, the handle roams among the base stations of the same roaming system, and the roaming base stations of the handle are adjacent base stations to each other. The signal strength of neighboring base stations searched by the base station and the roaming situation of the handle between different base stations can determine which base stations are around a certain base station, so as to collect the resources of these base stations and send them to the base station through the network.

Furthermore, the information sent between the base stations includes channel resource and synchronization channel information. Channel resources provide base station channel occupancy and avoid conflicts.

Furthermore, the base station judges whether the corresponding channel is free according to the received information. When the base station uses a new channel, it judges its own channel resources and the channel resources of neighboring base stations, and chooses to use idle channels; the handle receives resource information in the roaming system through the connected base station. The base station uses channel resources and synchronization channel information to avoid using occupied channels and resource conflicts.

Furthermore, the base station periodically sends status information to neighboring base stations through broadcasting; when the status of the channel resources of the base station changes, the changed status information is sent to the neighboring base stations through broadcasting. The base station periodically sends status information through broadcast, and the information transmission between the base stations is two-way. When the base station searches for neighboring base stations, it also receives the resource information of the neighboring base station. When it is confirmed that the channel resource status of the neighboring base station has changed, it will The changed status information is broadcast and sent in the roaming system.

Furthermore, the change of the channel resource state includes the change of the channel position and the change of the channel occupancy.

Furthermore, the handle connected to the base station receives the resource information sent by the base station, and when the handle switches the base station, the base station with idle resources is selected based on the information of the neighboring base stations. The handle can only receive data on one base station, and usually it can only know the resource status of the currently connected base station. If the handle needs to switch base stations, because it does not know the resources of other base stations, the base station connected to the handle provides the corresponding information to the handle through broadcast. Use this information to switch base stations to avoid resource conflicts caused by misuse of occupied channels when establishing a connection. At the same time, the handle can also use corresponding information to determine which base station to switch to when switching base stations, avoid unnecessary switching attempts, and improve resource utilization efficiency.

Furthermore, during synchronization, the base station with the best signal among neighboring base stations is the master base station. The synchronization level of the master base station is higher than the synchronization level of the slave base station. When the base station is synchronized, other base stations are recorded as potential master base stations; when the master base station cannot continue to synchronize, Select the base station with the best signal among potential main base stations through the network as the main base station to continue synchronization.

After the base station is synchronized through the air data, the channels of the two are synchronized. When the dummy of the master base station is changed, it only needs to notify the slave base station Slave Base through the network to ensure that even if there is serious interference in the air dummy channel, the data cannot be When conveyed to the slave base station Slave Base, the slave base station Slave Base can still be switched to a clean channel in time to continue to receive the dummy of the master base station Master Base.

Due to interference and other reasons, the slave base station Slave Base may lose synchronization with the master base station Master Base. At this time, using the network, the slave base station Slave Base can quickly obtain the channel of the current master base station Master Base and try to recover. If it cannot be recovered, it will pass The network requests the dummy of the other base station Base to replace the master base station Master Base, so that the synchronization is more reliable.

Since for the same base station Base, the same channel of Slot cannot be used at the same time, a slot is a time slice in the time division direction of DECT. A slot on a certain frequency represents a channel; but different base stations can be used at the same time. Therefore, there is a problem that the master base station Master Base establishes a dummy slot and a certain traffic of the slave base station Slave Base uses the same slot. Traffic is an air connection established between the Base and the handle. At this time, the slave base station Slave Base will not be able to receive the data of the master base station Master Base. If the dummy of the master base station Master Base changes position during this period, the slave base station Slave Base will not be able to know, but the network can be used to notify the slave base station of the change. Slave Base. In addition, the slave base station Slave Base can also request the master base station Mater Base to establish a dummy according to its own free position, thereby avoiding conflicts.

The synchronization level of the master base station is higher than that of the slave base station. The present invention retains the original method of transmitting dummy change information wirelessly, and increases the use of the network to transmit dummy change information at the same time. Both of them send information to the slave base station Slave Base at the same time. As long as the slave base station Slave Base receives any data from the wireless or network, it can be changed. Receiving data at the updated location greatly improves the reliability of synchronization between base stations and enhances the anti-interference ability of the system.

A DECT roaming system includes a number of base stations and a number of handles. The handles roam between the base stations. The system uses the described network-based DECT resource coordination method. The base station selects and marks the neighboring base stations through the network, and the neighboring base stations send their own information to each other. The base station selects the channel and synchronizes the base station information according to the received information, which improves the efficiency of the roaming system resource usage, reduces the probability of resource conflicts, and improves the system's anti-interference ability , Improve system reliability.

3. Beneficial effects

Compared with the prior art, the advantages of the present invention are:

(1) The use of the network to achieve air resource coordination between multiple base stations allows a base station to collect the channel resource usage of its neighboring base stations, and solves the problem that the DECT roaming system base stations cannot know the channel resource usage of neighboring base stations in advance. Avoid using channel resources that have been used by neighboring base stations to avoid conflicts;

(2) Using the network to realize the coordination of air resources of multiple base stations with the handle, the handle can learn the channel resource usage of the current connected base station and its neighboring base stations through the connected base station, so as to avoid trying the base station that has no free channel resources, and solves DECT roaming The handle in the system cannot know the channel resource usage of other base stations other than the currently connected base station, thereby avoiding conflicts and improving the efficiency of handover.

(3) The use of the network greatly enhances the anti-interference and reliability of clock synchronization between base stations of the DECT roaming system. The master base station Master Base notifies the dummy channel change information to the slave base station Slave Base through the network. There is no need to worry about wireless interference causing the slave base station Slave Base to fail to receive and the system is disconnected. Switch to the master base station to replace the master base to receive synchronization information in time through the network, so as to avoid system instability caused by system disconnection.

The present invention is based on the network-based DECT air resources, including channel resources and synchronization channel information. It makes full use of the characteristics of the network connection to connect information islands so as to make full use of the information resources collected by each base station; and expands the way of wireless information transmission. Some information that does not need to be wirelessly received from the air in real time can be transmitted through the network to improve the efficiency of resource use of the DECT roaming system, reduce the probability of resource conflicts, and improve system reliability and anti-interference capabilities.

Description of the drawings

Figure 1 is a schematic diagram of the principle of channel resource coordination according to the present invention;

2 is a flowchart of communication interaction for channel resource coordination in Embodiment 1 of the present invention;

Figure 3 is a schematic diagram of the principle of channel coordination and anti-interference in the present invention;

FIG. 4 is a flow chart of communication interaction for channel coordination and anti-interference in Embodiment 2 of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the drawings and specific embodiments of the specification.

Example 1

In a DECT roaming system, a number of base stations Base and a number of handles HS are included, and the handle HS roams among multiple base stations Base.

Figure 1 is a schematic diagram of the principle of channel resource coordination in this embodiment. In this embodiment, the base station Base and the handle HS can collect available resources of any base station Base and surrounding base stations Base for coordination. The resource coordination method is as follows:

The base station Base selects and marks the neighboring base stations through the network, and the neighboring base stations send their own information to each other. The base station base selects the channel according to the received information; when a certain base station is turned on, it checks the channels one by one in turn, and searches for the surrounding base stations. If a channel has passed the CRC check of the system and can receive the data correctly, then the base station Base keeps receiving on this channel for a period of time. CRC is a cyclic redundancy check. It is a control code used in a fixed data group in communication, so that the receiver can check the correct transmission of the data group one by one.

The base station Base searches the surrounding base stations Base by checking the channel, and by receiving the RFPI (RadioFixed Part Identity) data, it identifies the base station sending data on this channel, and judges whether the identified base station and the base station Base belong to the same DECT roaming In the system, the RFPI data is equivalent to the address information of the base station Base in the channel.

The base station judges whether the searched neighboring base station is based on the received signal strength. If the searched base station Base and the current base station Base belong to the same DECT roaming system, continue to determine the received signal strength indication RSSI (Received Signal Strength Indication) value. If the received RSSI value reaches a certain threshold, such as -70dBm, these base stations are considered Base and the base station Base belong to neighboring base stations, and will send information to each other through the network to send their respective resource conditions, and mark each other as neighboring base stations. The size of the RSSI threshold is adjusted according to the needs of different DECT roaming systems.

The base station selects the handle according to the received information: when the handle HS roams between two base stations Base, the two base stations Base are also marked as neighboring base stations with each other, and send each other's resources to each other; send between base stations The information includes channel resources and synchronization channel information.

The base station judges whether the corresponding channel is free according to the received information. When the base station uses the new channel to transmit data, it judges its own channel resources and the channel resources of neighboring base stations at the same time, and chooses to use the free channel. The base station Base continuously receives the resource data of each neighboring base station Base. During normal operation, the base station Base will continue to receive the RSSI values of all idle channels through hardware and use the stored resource conditions of each neighboring base station, by judging the RSSI threshold and the corresponding channel If there is a signal, you can know which channels are occupied and avoid using unavailable channels.

When the channel resource of the base station Base undergoes a state change, the changed state information is broadcast to its neighboring base stations. Once the channel resource usage status of a certain Base changes, it will broadcast this information to its neighboring base stations; the channel resource status changes include channel position changes and channel occupancy changes. For example, if the channel dummy location changes, the channel usage has been changed Waiting for the state to change.

If a base station Base wants to use a new channel, it will judge the channel condition it detects and the channel information of neighboring base stations at the same time, and avoid using those occupied channels.

The handle connected to the base station receives the resource information sent by the base station, and when the handle switches the base station, the base station with idle resources is selected based on the information of the neighboring base stations. If a handle is connected to the base station Base, the base station Base will periodically send information about itself and neighboring base stations to the handle. If the handle HS wants to use a new channel, it will also be based on the channel conditions detected by itself and the channel conditions of the neighboring base stations. The air resource data of neighboring base stations is sent to the handle, avoiding the use of occupied channels. Especially when the handle HS wants to switch the base station Base, by detecting the information of the neighboring base stations of the base station to be switched, determine whether the base station to be switched and its neighboring base stations have free resources. If the base station is to be switched, and the neighboring base stations have no free resources. , The handle HS does not have to try to switch to the base station Base, and directly checks the channel conditions of other base stations Base.

As shown in Figure 2, the channel resource coordination communication interaction flow chart, the private protocol Near BaseInfo is used in the air resource change notification when the system is coordinated. It can be used to notify resource changes between base stations, and it can also be used for base station base broadcast notification handle neighboring base stations. RPN is used to mark the ID of the base station Base in the system, Status is used to indicate whether this base station Base still has a free channel, and Dummy Channel is used to indicate the location of the dummy channel of the base station Base.

In this embodiment, in the same DECT roaming system, the base station Base and the handle HS cannot know the channel resource usage of other base stations and cannot recognize the conflict. When the resource utilization rate is low, the available resources of any base station Base and its neighboring base stations are collected and provided to The base station Base and the handle HS reduce the probability of resource conflicts and improve the efficiency of resource use.

Example 2

On the basis of Embodiment 1, this embodiment uses the network to improve the anti-interference ability of clock synchronization between base stations and improve the reliability of synchronization between base stations. When the base station synchronizes information, the base station with the best signal among the neighboring base stations is the main base station, and the synchronization level of the main base station is higher than the synchronization level of the slave base station. When the base station is synchronized, other base stations are recorded as potential main base stations; if the current main base station cannot continue to synchronize , Select the base station with the best signal among potential main base stations as the main base station to continue to synchronize information. Compared with the traditional way of transmitting data through the old channel in the air, in this embodiment, even if there is air interference, the network can still be used to lock the new channel position When data is received, and when the current main base station cannot continue to synchronize, a synchronization is selected from potential main base stations in time, which avoids disconnection during synchronization, enhances the system's anti-interference ability, and improves system stability.

Figure 3 is a schematic diagram of the principle of channel coordination and anti-interference. The master base station Master Base is associated with the slave base station SlaveBase. When the master base station Master Base cannot be used, the master base station Master Base sends dummy change information to the slave base station Slave Base through the network, which is different from The existing technology information is transmitted through the old channel in the air. Even if the air interference causes the Slave Base to be unable to receive the new dummy location information through the air, the network transmission can still be used to lock to the new dummy location for data reception to avoid disconnection; When the slave base station Slave Base cannot be synchronized with the master base station MasterBase, the base station with the best signal is selected from the potential master base stations as the master base station Master Base to continue synchronization to avoid disconnection.

The slave base station Slave Base requests to replace Base to replace the master base station Master Base to provide synchronization information. The main steps are as follows:

The base station Base selects and marks neighboring base stations through the network, and the neighboring base stations send their own data to each other, and the base station Base synchronizes the base station data according to the received information. When the slave base station Slave Base re-searches the master base station Master Base when it is powered on or offline, it will record the base station base that can provide synchronization information, and select the base station with the best signal as the master base station Master Base. In the same DECT roaming system, The base station whose synchronization level is higher than itself will be recorded in the list. Other base stations that are not set as the master base station Master Base are potential master base stations Master Base, and the current master base station Master Base cannot be used due to power outages and other reasons. Time to replace the current master base station Master Base, provide synchronization information for the base station Base, and improve the anti-interference resistance of the system.

The master base station Master Base retains the original method of transmitting dummy change information wirelessly, and increases the use of the network to transmit dummy change information at the same time. Both send information to the slave base station Slave Base. The slave base station Slave Base receives any data from the wireless or network. Can change to the updated location to receive data. Therefore, even if the slave base station Slave Base cannot receive normally due to wireless interference, it can still ensure the correct data reception through the network and request the master base station Master Base to use its own idle channel to establish a channel Dummy. If the channel dummy position of the master base station Master Base conflicts with the channel Traffic of the slave base station Slave Base, the slave base station Slave Base tries to switch the channel Traffic and follows. If the channel Dummy of the master base station Master Base changes during the information synchronization, the slave base station Slave Base still receives the changes through the network and continues to follow.

If the slave base station Slave Base cannot continue to receive data through the current master base station Master Base due to the power failure of the master base station Master Base, the slave base station Slave Base can select a base station with the best signal from the potential list and request it through the network. Dummy channel information, which can switch to the new master base station, Master Base, continue to maintain synchronization, avoid disconnection and interruption, and improve the stability of the system.

This embodiment solves the problem when the channel dummy change information of the master base station Master Base in the DECT roaming system cannot be normally received by the slave base station Slave Base due to interference, which will cause the slave base station Slave Base to go offline, which greatly improves the synchronization between the base stations. The anti-interference ability improves the reliability of the system.

As shown in Figure 4, the channel coordination and anti-interference communication interaction flow chart, the private protocol DummyInfo is used when the system is coordinated, which can be used by the master base station Master Base to notify the slave base station Slave Base location information, RPN is used to mark the ID of the Base in the system, and Status is used for Indicates whether there are idle channels in this Base. Dummy Channel is used to point out the position of the Dummy channel of the Base.

The invention and its implementation are described schematically above. The description is not restrictive. The invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the invention. What is shown in the drawings is only one of the embodiments created by the present invention, and the actual structure is not limited to this, and any reference signs in the claims should not limit the related claims. Therefore, if a person of ordinary skill in the art receives its enlightenment and does not deviate from the purpose of this creation, without creative design, structural methods and embodiments similar to the technical solution shall fall within the scope of protection of this patent. In addition, the word "comprising" does not exclude other elements or steps, and the word "a" before an element does not exclude the inclusion of "plurality" of the element. Multiple elements stated in the product claims can also be implemented by one element through software or hardware. Words such as first and second are used to denote names, but do not denote any specific order.

Claims

A network-based DECT resource coordination method is characterized in that it is applied to a DECT roaming system. The base station selects and marks neighboring base stations through the network, and the neighboring base stations send their own information to each other, and the base station selects a channel or synchronizes base station information according to the received information.
The network-based DECT resource coordination method according to claim 1, wherein the base station searches for surrounding base stations by checking the channel, and the base station judges whether the searched is a neighboring base station according to the received signal strength.
The network-based DECT resource coordination method according to claim 2, wherein the handle roams among base stations of the same roaming system, and the roaming base stations of the handle are neighboring base stations.
A network-based DECT resource coordination method according to claim 2 or 3, wherein the information sent between the base stations includes channel resources and synchronization channel information.
A network-based DECT resource coordination method according to claim 4, characterized in that the base station judges whether the corresponding channel is idle according to the received information, and the base station judges its own channel resources and the channel resources of neighboring base stations at the same time when using a new channel, Choose to use the idle channel; the handle receives the resource information in the roaming system through the connected base station.
A network-based DECT resource coordination method according to claim 5, wherein the base station periodically sends status information to neighboring base stations through broadcasting; when the status of the channel resources of the base station changes, the changed status information is sent to the neighboring base stations through broadcasting. Neighboring base station.
A network-based DECT resource coordination method according to claim 6, wherein the change of the channel resource state includes a change of channel position and a change of channel occupancy.
A network-based DECT resource coordination method according to claim 4, wherein the handle connected to the base station receives the resource information sent by the base station, and when the handle switches the base station, the information of the neighboring base station is used to select the idle resource Base station.
A network-based DECT resource coordination method according to claim 4, characterized in that, during synchronization, the base station with the best signal among neighboring base stations is the master base station, and the synchronization level of the master base station is higher than the synchronization level of the slave base station. During synchronization, other base stations are recorded as potential primary base stations; when the primary base station cannot continue to synchronize, the base station with the best signal is selected from the potential primary base stations through the network as the primary base station to continue synchronization.
A DECT roaming system includes a number of base stations and a number of handles. The handles roam between the base stations. The feature is that the system uses any of the network-based DECT resource coordination methods according to claims 1-9.