CN113692016B - Multimode terminal control method supporting railway radio service automatic shunting - Google Patents
Multimode terminal control method supporting railway radio service automatic shunting Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0284—Traffic management, e.g. flow control or congestion control detecting congestion or overload during communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
- H04W28/09—Management thereof
- H04W28/0958—Management thereof based on metrics or performance parameters
- H04W28/0967—Quality of Service [QoS] parameters
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention relates to a multimode terminal control method supporting railway radio service automatic shunting, S1: determining that the primary network is a dedicated broadband network; the service operation scene where the multimode terminal is located comprises a plurality of wireless access systems, the multimode terminal initiates a service request to a main network through a random access channel, and the main network sends a measurement instruction to the multimode terminal according to the service load of a bearing network and through a broadcast channel; s2: the multimode terminal measures the wireless access system to form a parameter index of a measurement report; s3: the main network determines the type of the multimode terminal and performs service diversion according to the measurement report, the service priority requirement of the current network and the service load; after the type of the multimode terminal is determined, the main network issues a service distribution instruction to the multimode terminal through a reserved field and an extension field in a broadcast channel, and after the multimode terminal receives the instruction, the multimode terminal switches the corresponding radio service to a designated module through analysis, so that the specific QoS requirement is met.
Description
Technical Field
The present invention relates to the field of railway networks, and more particularly, to an automatic distribution method for implementing railway radio services by controlling multimode terminals.
Background
With the development of broadband mobile communication and mobile internet, data has become an increasingly dominant share of network traffic. According to the predictions, the data traffic of the existing network will reach 90% of the overall traffic of the network. On the other hand, if all data traffic is converged into a single network under the condition of limited system capacity, a great pressure is exerted on data switching nodes and network transmission. On the other hand, there are usually a plurality of optional service support networks, and there are cases where the utilization of network resources is not uniform, for example, there are cases where the public mobile communication network has uneven service distribution widely in some time and space, so network sharing is a very effective technical means for improving the utilization of resources. If this fact is not considered, the network operation cost is greatly increased by simply performing the network capacity expansion and upgrading, and great resource waste is caused. In this regard, the frequency resources of dedicated railway wireless communication networks are very limited and often cannot meet the need for full service bearers at the same time. Therefore, the method is supplemented by means of combination of public and private networks (public network and private network), so that the network construction operation and maintenance cost is reduced, and the network utilization rate is effectively improved. Under the push of this demand, the service diversion technique becomes a very effective means. Although 3GPP (3 rd Generation Partnership Project, third generation mobile communication partner organization) proposes a network architecture of LIPA/SIPTO (Local IP Access/Selected IP Traffic Offload) to offload mobile traffic of a selected core network, no specific solution is given for how to perform efficient traffic balancing and reasonable traffic offload between heterogeneous networks.
For a railway-specific mobile communication system with limited resources, under the condition that the spectrum resources of the special railway radio service are very limited, the requirements of the mission-critical service related to driving are required to be preferentially ensured. The purpose of the private network service automatic distribution technology is to ensure that the service with high security level can be carried through a private communication network, such as command and dispatch, train control, video monitoring, data transmission, in-station shunting, maintenance data and infrastructure monitoring. The access network side is not high in security level, and meanwhile, the service with large bandwidth requirement is dredged to the public mobile communication network, or the low-rate service with low priority is dredged to the existing narrow-band mobile communication system of the railway, such as GSM-R, DMR, so that the resource waste caused by transmission of a large amount of service data between the core network and the access network is avoided, the service performance is improved, the capacity expansion pressure faced by the mobile communication network is reduced, and the overall investment cost of the mobile communication network is controlled. Particularly, for typical hot spot communication areas such as railway large-scale guest stations, marshalling stations and the like, when traffic congestion occurs, qoS guarantee of mission-critical services is affected, and when traffic congestion is severe, network service withdrawal is possibly caused, and even network security is endangered. In summary, if the priority and importance of the service are not differentiated, the QoS of the mission critical service cannot be fully guaranteed, which inevitably poses a significant challenge to railway transportation safety.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a multimode terminal control method supporting the automatic shunting of railway radio service, which adopts multimode terminals integrated with special broadband, special narrowband and universal broadband simultaneously to realize reasonable shunting of service. As shown in fig. 1, the dedicated broadband module and the narrowband module mainly implement broadband and narrowband communication services with mission critical properties, and the universal broadband module implements broadband service bearer independent of driving. The key point of the invention is that: based on the integrated multimode wide/narrow band convergence terminal, the railway special broadband network is used as a main network, and can realize effective service diversion through a signal measurement technology and a priority-based diversion technology under the condition that a protocol does not need to be modified, including the condition that a public mobile communication network does not need to make any change, so that the QoS of railway radio services of various grades can be practically ensured.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention discloses a multimode terminal control method supporting railway radio service automatic shunting, which comprises the following steps:
s1: determining that a primary network of railway service operation is a special broadband network, a secondary network is a special narrowband network, and an optional network is other accessible networks; the multi-mode wide/narrow-band fusion terminal integrates three types of modules, including a special broadband module, a special narrow-band module and a universal broadband module, wherein the special broadband module and the special narrow-band module are used for realizing broadband and narrow-band communication service with task key attributes, and the universal broadband module is used for realizing broadband service bearing irrelevant to driving; the service operation scene of the multi-mode wide/narrow-band fusion terminal comprises a plurality of wireless access systems with access conditions, the multi-mode wide/narrow-band fusion terminal initiates a service request to a main network through a random access channel, and the main network sends a measurement instruction to the multi-mode wide/narrow-band fusion terminal through a broadcast channel (BCH: broadcast Channel) according to the service load of the bearer network;
s2: the multi-mode width/narrow-band fusion terminal measures a plurality of wireless access systems with access conditions according to a radio signal measurement criterion to form a measurement report; the measurement report is composed of a simplified index field;
the primary network-broadband railway private network referred to by the present invention is understood to be the network with the most concentrated service and dominant.
S3: the main network determines the type of the multi-mode wide/narrow-band fusion terminal according to the measurement report, the service priority requirement of the current network and the service load and performs service diversion; after the type of the multi-mode wide/narrow-band convergence terminal is determined, the main network issues a service diversion instruction to the multi-mode wide/narrow-band convergence terminal through a reserved field and an extension field in a broadcast channel, and after the multi-mode wide/narrow-band convergence terminal receives the instruction, the multi-mode wide/narrow-band convergence terminal switches corresponding radio service to a designated module through analysis and selects the module to perform service interaction with a corresponding radio access network, so that the specific QoS (Quality of Service, service quality) requirement is met.
Preferably, the multimode wide/narrow band convergence terminal can automatically identify the radio bearer network of the scene; the dedicated narrowband module includes: GSM-R (GSM for railway) and DMR (Digital Mobile Radio), said dedicated broadband module comprising: dedicated broadband 5G-R (5G for train) and railroad WiFi, the universal broadband module comprising: public broadband module LTE (Long Term Evolution ), 5G, public WiFi, etc.;
the working mode of the multimode wide/narrow band fusion terminal is attached to a primary cell, a secondary cell or a selectable cell, the primary cell is a cell subordinate to a primary network, the secondary cell is a cell inferior to the primary cell only, the selectable cell is a potential accessible cell, and the wireless access system is a potential accessible cell.
Preferably, the method for selecting the working mode by the multimode wide/narrow band fusion terminal comprises the following steps:
the index fields are 01, 02 and 03, 01, 02 and 03 respectively represent a main network, a secondary network and an accessible network, the information mapping of the index fields is carried out locally, namely, the information corresponding to the index values is stored in a multi-mode wide/narrow-band fusion terminal or the main network, so that the transmission through an air interface is not needed, the measurement report is greatly simplified by an index transmission mode, and the measurement information can be further reported to the main network by using a reserved field and an extension field. The information index is mainly used for identifying the available state, coverage quality and service load of the scene where the service is located;
and after the index field information in the measurement report is mapped, the multimode wide/narrow band fusion terminal completes the selection of the working mode. The traffic priority can be further combined, and the most reasonable traffic unloading mode is realized by deciding and selecting a proper communication module, namely, the traffic is selectively shunted into a special broadband network, a special narrowband network, a public communication network and WiFi, so that the user experience is improved to the greatest extent.
Preferably, the service operation scene comprises a primary network, a secondary network and an optional network, wherein the primary network and the secondary network have the function of extracting network statistics, the optional network refers to other accessible networks except a railway private network and comprises a public communication network and a WiFi, the public communication network refers to a public broadband mobile communication network, and the WiFi comprises railway WiFi and public WiFi;
the special broadband network, the special narrowband network and the public broadband mobile communication network are cellular networks;
the business operation scene is a railway large-scale guest station, a marshalling station, a large-scale sports place, a large-scale commercial facility or a large-scale gathering, etc.;
the service request is sent without changing the protocol specification.
Preferably, the specific steps of S2 are:
s21: the measurement report adopts an index mode to represent RSRP (Reference Signal Receiving Power, reference signal received power) and RSRQ (Reference Signal Receiving Quality, reference signal received quality), the RSRP and the RSRQ are divided into different access levels through indexes, the index values 0-9 are used for representing different signal strengths, information to be transmitted is only a very limited index value, the actual signal strength is defined locally and is not transmitted through an air interface; and (3) injection: the index mode designed here represents the corresponding power value by integer number, for example, 1 corresponds to-30 dBm, wherein the index increment 1 can be defined to represent the increase of 1dBm of the absolute power value, the index decrement-1 represents the decrease of 1dBm of the absolute power value, the effective range of-30 dBm can be set to plus or minus 0.5dBm, so that the length of occupied protocol field can be reduced, and in addition, the decision power increment corresponding to the index increment can be set according to the requirement.
S22: the multi-mode wide/narrow-band fusion terminal obtains the current network load and the current primary cell or the allocable frequency resource of the wireless access system through the primary network, and perceives the public communication network and WiFi through frequency scanning;
s23: primary network QoS measurement procedure:
firstly, measurement configuration is carried out, a multi-mode wide/narrow-band fusion terminal is in a measurement mode, the multi-mode wide/narrow-band fusion terminal measures a current main cell according to a measurement instruction sent by a main network, whether measurement on a wireless access system is required to be carried out is judged according to the result of S22, and if the wireless access system exists, the measurement is carried out on the wireless access system;
s24: the multi-mode wide/narrow band fusion terminal measures the receiving level quality of a wireless access system in a service operation scene, writes the receiving level quality of the wireless access system into the RSRP in a measurement report, and the measuring process is as follows: the method comprises the steps of alternately carrying out under the control of multimode wide/narrow band fusion terminal software, wherein the multimode wide/narrow band fusion terminal software is application software installed on a multimode wide/narrow band fusion terminal and is used for controlling a measurement process, carrying out protocol analysis, extracting index information from an extension field and a reserved field and finishing final mapping of the index information;
s25: and initiating trial access through the multi-mode wide/narrow-band fusion terminal, counting the service quality of different wireless access systems, such as access delay and access request time, and writing the service quality of the wireless access systems into the RSRQ in the measurement report to form the measurement report.
Preferably, the specific steps of S3 are:
s31: determining a service diversion condition;
the service diversion conditions include: the quality of the receiving level of the wireless access system, the service quality of the wireless access system and the network state of the wireless access system;
s32: considering the quality of the reception level of a radio access system, P r ，P c ，P p ，P w N times of power statistical average respectively representing primary network, secondary network, public communication network and WiFi access point, when P is satisfied r >P min,r In which P is min,r Representing the lowest level that can access the active network, the multi-mode wide/narrow-band convergence terminal can access the active network when P is satisfied c >P min,c In which P is min,c Representing the lowest level capable of accessing the secondary network, the multi-mode wide/narrow band convergence terminal can access the secondary network when P is satisfied p >P min,p In which P is min,p Representing the lowest level of access to the public communication network, the multi-mode/narrowband convergence terminal is able to access the public communication network when P is satisfied w >P min,w In which P is min,w Representing the lowest possible access to WiFiThe level, the multi-mode width/narrow-band fusion terminal can be accessed to WiFi;
s33: secondly, considering the service quality of a wireless access system;
s34: finally, consider the network state of the wireless access system: the network bearing capacity is good and is in a state of not being busy;
s35: when the service diversion conditions are all satisfied, service diversion is performed;
s36: the working mode of the main network does not need to be changed, the service distribution only needs to change the working mode of the multi-mode wide/narrow-band fusion terminal through the multi-mode wide/narrow-band fusion terminal software, and the service distribution can be realized through application programs (apps) for a smart phone system (such as android).
Preferably, the multi-mode wide/narrow band convergence terminal defines the measurement report by reserving the field and expanding the field, because only the measurement grade needs to be transmitted, and only few bits are needed to be realized;
the main network sends the control instruction through the reserved field and the extension field, and the control instruction can be realized by only transmitting the target network selection information and only needing few bits.
Preferably, the traffic split in step S3 is based on the current load-bearing capacity and busyness of the network.
Preferably, the modes of service splitting include a broadband service default splitting mode and a narrowband service default splitting mode.
Preferably, the default splitting mode of the broadband service is: secure traffic and high priority traffic are split into a private broadband network and non-secure traffic and low priority traffic are split into a public communication network.
Preferably, the default splitting mode of the narrowband service is: secure traffic and high priority traffic are split into dedicated narrowband networks and non-secure traffic and low priority traffic are split into public communication networks.
The beneficial effects of the invention are as follows:
the invention provides a multimode terminal control method supporting railway radio service automatic shunting, which divides a service bearing network into a main network and an optional network, wherein a railway special broadband network is used as the main network, and can realize effective service shunting through a signal measurement technology and a priority-based shunting technology under the condition that a protocol does not need to be modified, including the condition that a public communication network does not need to be changed, so that the QoS of railway radio service of various grades can be practically ensured.
Drawings
The invention has the following drawings:
FIG. 1 illustrates a scenario diagram of a multimode terminal control method supporting automatic offloading of railroad radio traffic in accordance with the present invention;
FIG. 2 is a flow chart of an embodiment of a multi-mode terminal control method supporting automatic shunting of railway radio services in accordance with the present invention;
FIG. 3 is a schematic diagram of a measurement method of one measurement criterion of the present invention;
FIG. 4 is a diagram of a method of implementing railway radio service access based on measurement criteria in accordance with the present invention;
fig. 5 is a schematic diagram showing the definition of command control fields of a multimode terminal control method supporting automatic shunting of railway radio services according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 to 5 show a multimode terminal control method supporting railway radio service automatic distribution, the invention distributes railway wide/narrow band service according to service safety requirement and priority, and effective service distribution is realized by signal measurement technology and priority-based distribution technology, so as to ensure that QoS of railway radio service of various grades can be practically ensured, and maximize network resource utilization.
In this embodiment, the method includes:
s1: determining that a primary network of railway service operation is a special broadband network, a secondary network is a special narrowband network, and an optional network is other accessible networks; the multi-mode wide/narrow-band fusion terminal integrates three types of modules, including a special broadband module, a special narrow-band module and a universal broadband module, wherein the special broadband module and the special narrow-band module are used for realizing broadband and narrow-band communication service with task key attributes, and the universal broadband module is used for realizing broadband service bearing irrelevant to driving; the service operation scene of the multi-mode wide/narrow-band fusion terminal comprises a plurality of wireless access systems with access conditions, the multi-mode wide/narrow-band fusion terminal initiates a service request to a main network through a random access channel, and the main network sends a measurement instruction to the multi-mode wide/narrow-band fusion terminal through a broadcast channel according to the service load of a bearing network;
s2: the multi-mode width/narrow-band fusion terminal measures a plurality of wireless access systems with access conditions according to a radio signal measurement criterion to form a measurement report; the measurement report is composed of a simplified index field;
the primary network-broadband railway private network referred to by the present invention is understood to be the network with the most concentrated service and dominant.
S3: the main network determines the type of the multi-mode wide/narrow-band fusion terminal according to the measurement report, the service priority requirement of the current network and the service load and performs service diversion; after the type of the multi-mode wide/narrow-band fusion terminal is determined, the main network issues a service distribution instruction to the multi-mode wide/narrow-band fusion terminal through a reserved field and an extension field in a broadcast channel, and after the multi-mode wide/narrow-band fusion terminal receives the instruction, the multi-mode wide/narrow-band fusion terminal switches corresponding radio service to a designated module through analysis and selects the module to perform service interaction with a corresponding radio access network, so that specific QoS requirements are met.
Preferably, the multimode wide/narrow band convergence terminal can automatically identify the radio bearer network of the scene; the dedicated narrowband module includes: GSM-R and DMR, the special broadband module includes: 5G-R and railway WiFi, the universal broadband module comprises: LTE, 5G, (5G for ranging), public WiFi, and the like;
the working mode of the multimode wide/narrow band fusion terminal is attached to a primary cell, a secondary cell or a selectable cell, wherein the primary cell is a cell subordinate to a primary network, the secondary cell is a cell inferior to the primary cell only, and the selectable cell is a potential accessible cell.
Preferably, the method for selecting the working mode by the multimode wide/narrow band fusion terminal comprises the following steps:
the index fields are 01, 02 and 03, 01, 02 and 03 respectively represent a main network, a secondary network and an accessible network, the information mapping of the index fields is carried out locally, namely, the information corresponding to the index values is stored in a multi-mode wide/narrow-band fusion terminal or the main network, so that the transmission through an air interface is not needed, the measurement report is greatly simplified by an index transmission mode, and the measurement information can be further reported to the main network by using a reserved field and an extension field. The information index is mainly used for identifying the available state, coverage quality and service load of the scene where the service is located;
and after the index field information in the measurement report is mapped, the multimode wide/narrow band fusion terminal completes the selection of the working mode. The traffic priority can be further combined, and the most reasonable traffic unloading mode is realized by deciding and selecting a proper communication module, namely, the traffic is selectively shunted into a special broadband network, a special narrowband network, a public communication network and WiFi, so that the user experience is improved to the greatest extent.
Preferably, the service operation scene comprises a primary network, a secondary network and an optional network, wherein the primary network and the secondary network have the function of extracting network statistics, the optional network refers to other accessible networks except a railway private network and comprises a public communication network and WiFi, the public communication network comprises a public broadband mobile communication network, and the WiFi comprises railway WiFi and public WiFi;
the special broadband network, the special narrowband network and the public broadband mobile communication network are cellular networks;
the business operation scene is a railway large-scale guest station, a marshalling station, a large-scale sports place, a large-scale commercial facility or a large-scale gathering, etc.;
the service request is sent without changing the protocol specification.
Preferably, the specific steps of S2 are:
s21: the measurement report adopts an index mode to represent RSRP (Reference Signal Receiving Power, reference signal received power) and RSRQ (Reference Signal Receiving Quality, reference signal received quality), the RSRP and the RSRQ are divided into different access levels through indexes, the index values 0-9 are used for representing different signal strengths, information to be transmitted is only a very limited index value, the actual signal strength is defined locally and is not transmitted through an air interface;
s22: the multi-mode wide/narrow-band fusion terminal obtains the current network load and the current primary cell or the allocable frequency resource of the wireless access system through the primary network, and perceives the public communication network and WiFi through frequency scanning;
s23: primary network QoS measurement procedure:
firstly, measurement configuration is carried out, a multi-mode wide/narrow-band fusion terminal is in a measurement mode, the multi-mode wide/narrow-band fusion terminal measures a current main cell according to a measurement instruction sent by a main network, whether measurement on a wireless access system is required to be carried out is judged according to the result of S22, and if the wireless access system exists, the measurement is carried out on the wireless access system;
s24: the multi-mode wide/narrow band fusion terminal measures the receiving level quality of a wireless access system in a service operation scene, writes the receiving level quality of the wireless access system into the RSRP in a measurement report, and the measuring process is as follows: the method comprises the steps of alternately carrying out under the control of multimode wide/narrow band fusion terminal software, wherein the multimode wide/narrow band fusion terminal software is application software installed on a multimode wide/narrow band fusion terminal and is used for controlling a measurement process, carrying out protocol analysis, extracting index information from an extension field and a reserved field and finishing final mapping of the index information;
s25: and initiating trial access through the multi-mode wide/narrow-band fusion terminal, counting the service quality of different wireless access systems, such as access delay and access request time, and writing the service quality of the wireless access systems into the RSRQ in the measurement report to form the measurement report.
Preferably, the specific steps of S3 are:
s31: determining a service diversion condition;
the service diversion conditions include: the quality of the receiving level of the wireless access system, the service quality of the wireless access system and the network state of the wireless access system;
s32: considering the quality of the reception level of a radio access system, P r ，P c ，P p ，P w N times of power statistical average respectively representing primary network, secondary network, public communication network and WiFi access point, when P is satisfied r >P min,r In which P is min,r Representing the lowest level that can access the active network, the multi-mode wide/narrow-band convergence terminal can access the active network when P is satisfied c >P min,c In which P is min,c Representing the lowest level capable of accessing the secondary network, the multi-mode wide/narrow band convergence terminal can access the secondary network when P is satisfied p >P min,p In which P is min,p Representing the lowest level of access to the public communication network, the multi-mode/narrowband convergence terminal is able to access the public communication network when P is satisfied w >P min,w In which P is min,w The lowest level which can be accessed to WiFi is represented, and the multi-mode wide/narrow-band fusion terminal can be accessed to WiFi;
s33: secondly, considering the service quality of a wireless access system;
s34: finally, consider the network state of the wireless access system: the network bearing capacity is good and is in a state of not being busy;
s35: when the service diversion conditions are all satisfied, service diversion is performed;
s36: the working mode of the main network does not need to be changed, the service distribution only needs to change the working mode of the multi-mode wide/narrow-band fusion terminal through the multi-mode wide/narrow-band fusion terminal software, and the service distribution can be realized through application programs (apps) for a smart phone system (such as android).
Preferably, the multi-mode wide/narrow band convergence terminal defines the measurement report by reserving the field and expanding the field, because only the measurement grade needs to be transmitted, and only few bits are needed to be realized;
the main network sends the control instruction through the reserved field and the extension field, and the control instruction can be realized by only transmitting the target network selection information and only needing few bits.
Preferably, the traffic split in step S3 is based on the current load-bearing capacity and busyness of the network.
Preferably, the modes of service splitting include a broadband service default splitting mode and a narrowband service default splitting mode.
Preferably, the default splitting mode of the broadband service is: secure traffic and high priority traffic are split into a private broadband network and non-secure traffic and low priority traffic are split into a public communication network.
Preferably, the default splitting mode of the narrowband service is: secure traffic and high priority traffic are split into dedicated narrowband networks and non-secure traffic and low priority traffic are split into public communication networks.
The invention utilizes a multimode terminal control method supporting the automatic shunting of railway radio service to acquire the available network information of the multimode wide/narrow band fusion terminal in the current environment, realizes the effective service shunting through the signal measurement technology and the priority-based shunting technology, and ensures that the QoS of the railway radio service of various grades can be practically ensured. The active network informs the multi-mode wide/narrow band convergence terminal to select the designated access network via a reserved field or an extension field in the protocol specification. The measurement report in the invention is derived from a multi-mode wide/narrow-band fusion terminal, has the characteristics of reliable data source, low cost and reality and comprehensiveness, and the measurement report function is completed by the multi-mode wide/narrow-band fusion terminal, so that the method is suitable for the conditions of various heterogeneous networks; the primary network is issued through the broadcast channel, so that the network performance is not affected. The method of the invention can fully utilize the high capacity support capability and high safety advantage of the public broadband mobile communication network under the condition that the railway special bandwidth network is strictly limited, can ensure that different types of railway broadband services can communicate with the corresponding service bearing network by selecting the most suitable wireless communication module, and meets the specific QoS requirement of the railway special service.
The invention is further described in a specific embodiment, where the service operation scenario in the embodiment of the invention is that the environment where the multi-mode wide/narrow band convergence terminal is located has multiple network access conditions, such as a railway private network wide/narrow band, a public communication network, wiFi and the like, the multi-mode wide/narrow band convergence terminal refers to a communication equipment terminal with multiple working modes, including GSM-R, DMR, 5G-R, GSM, LTE, 5G, wiFi and the like, and the multi-mode wide/narrow band convergence terminal can be implemented through CPE (Customer Premise Equipment ). Of course, it will be appreciated that multimode wide/narrowband converged terminals are typically provided with all or part of the network access conditions described above.
Table 1 parameters and reference tables (as network environment changes) for multi-mode wide/narrow band convergence terminal measurement event
According to the parameters and the reference values of the measurement events of the multi-mode wide/narrow-band fusion terminal in the table 1, the network access condition of the environment where the multi-mode wide/narrow-band fusion terminal is located can be effectively estimated; based on measurement statistical data (such as arithmetic average of 20 measurements), each module can judge the actual access capability of the network by combining the corresponding value range, and the measurement result meeting the value range can be used as a candidate access network. After the measurement report is sent to the active network, further, referring to table 2, the service bearer performance threshold of the active network is referred to determine the final target network, where the information on the active network side, that is, the frequency occupancy and the core network load, are combined, so as to determine the access conditions of the multi-mode wide/narrow band convergence terminal and the active network at the same time.
Table 2 primary network service bearer performance threshold
Referring to fig. 3, a detailed description will be made of a multimode/narrowband convergence terminal flow based on measurement criteria.
Step 101: the multi-mode wide/narrow band fusion terminal initiates a service request, and in the RRC connection state, the main network sends an instruction for starting the measurement process of the multi-mode wide/narrow band fusion terminal in the service assignment process.
Step 102: after receiving the measurement instruction of the main network, the multi-mode wide/narrow-band fusion terminal measures a plurality of signals (at least two) of the adjacent cells through different wireless receiving modules in a software control mode, and the measurement results (power values) are taken as arithmetic average values to obtain the service quality of different cells. Depending on the differences in coverage of different networks, the measurement reports may contain measurements at different hierarchical levels.
Step 103: the multi-mode/narrowband convergence terminal starts sequential measurement of each communication module except the main network, and referring to fig. 3, a measurement report is generated when all module measurements are finished.
Step 104: in the RRC connected state, the multi-mode wide/narrow band convergence terminal transmits a measurement report to the active network in the reserved field and the extension field
Referring to fig. 4, a detailed description will be made of a control flow of the multimode/narrowband convergence terminal operation mode based on the measurement report.
Step 201: the working mode of parallel processing with the multi-mode width/narrow-band fusion terminal is adopted by the main network, and when step 101 is executed, namely when a service request of the multi-mode width/narrow-band fusion terminal is received, the main network starts to extract network performance data and service priority attributes of users.
Step 202: the main network firstly judges the wireless access condition of the multi-mode wide/narrow-band fusion terminal according to the table 1, if the wireless access condition is met, the next step is carried out, namely the shunt network identification is determined by combining the table 2; if the measurement report shows that the access condition is not satisfied, the service is directly carried through the active network. In this case, the multimode wide/narrowband converged terminal measurement report is to confirm whether other target cells (e.g., 5G) satisfy the radio access condition.
Step 203: the main network starts the measuring process of the multi-mode wide/narrow-band fusion terminal and simultaneously obtains the service load of the main network through the core network in parallel, and when the measuring report of the multi-mode wide/narrow-band fusion terminal is obtained, the optimal target network to be accessed in the next step of the multi-mode wide/narrow-band fusion terminal can be determined by combining the service priority.
Step 204: the multi-mode wide/narrow band fusion terminal receives a control instruction issued by the main network through a broadcast channel, extracts network selection information in a reserved or extended field, switches a communication module according to a target access network identifier NI and loads a service, namely, enters a target network working mode determined by the main network.
Referring to fig. 5, a detailed description will be made of a control word format for controlling a multi-mode wide/narrow band convergence terminal.
The multimode terminal control method supporting the railway radio service automatic distribution provided by the invention can effectively select the target network in the service activation process, thereby distributing the service to different users. Particularly, the multi-mode wide/narrow-band convergence terminal with a plurality of communication modules can measure potential accessible networks under the control of the main network, and send measurement reports through RRC connection with the main network, the main network can determine the optimal service access mode of the multi-mode wide/narrow-band convergence terminal according to the measurement reports reported by the multi-mode wide/narrow-band convergence terminal and the current service load of the network, thereby controlling the balanced distribution of service flow among different networks, better ensuring the QoS requirement of railway key services, and simultaneously, solving the problems that the frequency of a railway special mobile communication network is insufficient, the high-capacity and high-bandwidth communication cannot be satisfied, and meeting the service requirements of railway communication hotspots, such as passenger transportation/freight transportation hubs, railway hubs, maintenance bases, marshalling stations and the like, because the advantages of the bandwidth resources of the public communication network or other communication networks can be fully utilized. The invention can realize resource sharing among different networks under the condition that a plurality of wireless communication networks coexist, can realize maximization of network resource utilization, satisfies high-capacity communication requirements and high-efficiency utilization of frequency spectrum, and solves the contradiction of frequency resource shortage in railway communication hot spot areas.
It will be appreciated that the present invention proposes a method for automatically diverting radio traffic on rail (high speed and normal speed) in order to address railway traffic operating scenarios such as passenger/freight hubs, railroad hubs, maintenance bases, marshalling stations, etc. The method is not only suitable for other related railway scenes, such as railway motor train stations (places for warehouse entry and overhaul of high-speed rail trains) and the like, but also suitable for shunting of some public LTE mobile communication systems in large traffic scenes, such as large-scale stadiums, conference centers, traffic hub (areas) and other service hot spot areas, and the 3 core technologies and related steps provided by the invention are still utilized conditionally, so that efficient radio service shunting is realized, namely: (1) There are multiple accessible networks, which may be railway private mobile communication networks, public mobile communication networks, wiFi, and may be broadband or narrowband while satisfying access conditions; (2) Accurately sensing availability of different networks by measurement; (3) The method for automatically shunting the service based on measurement can shunt the data flow under a specific scene based on a unified multi-mode wide/narrow-band fusion terminal, and the multi-mode wide/narrow-band fusion terminal can integrate more modules on demand under the fact that the multi-mode wide/narrow-band fusion terminal conditionally along with the progress of technology, thereby relieving the resource consumption of the railway special communication network and realizing the comprehensive access of the railway radio service which is mutually complemented by a plurality of access modes of the special network, the public network and the WLAN shared network.
The above describes in detail a multimode terminal control method supporting automatic shunting of railway radio service, and herein, the principle and implementation of the present invention are described by analyzing the communication examples (control word design and transmission of control command) of the multimode wide/narrow band convergence terminal, and the description of the above examples is only used to help understand the method and core idea of the present invention; meanwhile, according to the idea of the present invention, those skilled in the art will change the specific implementation and application scope, for example, the present invention is applicable to any communication network with multiple access conditions, for example, different networks of different mobile operators, including various networks with different standards, and all functions of the present invention can be implemented only by configuring a corresponding communication module, at the same time, all communication protocols are reserved with reserved fields and extension fields, and enough space is provided to ensure that control words required by the multi-mode wide/narrow-band convergence terminal control and service splitting can be defined; on the other hand, the random service access channel and the broadcast channel are common technologies for cellular mobile communication, and the measurement report and the network selection instruction can be transmitted through the above channels without changing the existing protocol specification, so that the present disclosure should not be construed as limiting the present invention.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (5)
1. A multimode terminal control method supporting railway radio service automatic shunting is characterized by comprising the following steps:
s1: determining that a primary network of railway service operation is a special broadband network, a secondary network is a special narrowband network, and an optional network is other accessible networks; the multi-mode wide/narrow-band fusion terminal integrates three types of modules, including a special broadband module, a special narrow-band module and a universal broadband module, wherein the special broadband module and the special narrow-band module are used for realizing broadband and narrow-band communication service with task key attributes, and the universal broadband module is used for realizing broadband service bearing irrelevant to driving; the service operation scene of the multi-mode wide/narrow-band fusion terminal comprises a plurality of wireless access systems with access conditions, the multi-mode wide/narrow-band fusion terminal initiates a service request to a main network through a random access channel, and the main network sends a measurement instruction to the multi-mode wide/narrow-band fusion terminal through a broadcast channel according to the service load of a bearing network;
s2: the multi-mode width/narrow-band fusion terminal measures a plurality of wireless access systems with access conditions according to a radio signal measurement criterion to form a measurement report; the measurement report is composed of a simplified index field;
s3: the main network determines the type of the multi-mode wide/narrow-band fusion terminal according to the measurement report, the service priority requirement of the current network and the service load and performs service diversion; after the type of the multi-mode wide/narrow-band fusion terminal is determined, the main network issues a service diversion instruction to the multi-mode wide/narrow-band fusion terminal through a reserved field and an extension field in a broadcast channel, and after the multi-mode wide/narrow-band fusion terminal receives the instruction, the multi-mode wide/narrow-band fusion terminal switches corresponding radio service to a designated module through analysis and selects the module to perform service interaction with a corresponding radio access network, so that specific QoS requirements are met;
the specific steps of S2 are as follows:
s21: the measurement report adopts an index mode to represent RSRP and RSRQ, the RSRP and the RSRQ are divided into different access levels through indexes, and index values 0-9 are used for representing different signal strengths;
s22: the multi-mode wide/narrow-band fusion terminal obtains the current network load and the current primary cell or the allocable frequency resource of the wireless access system through the primary network, and perceives the public communication network and WiFi through frequency scanning;
s23: primary network QoS measurement procedure:
firstly, measurement configuration is carried out, a multi-mode wide/narrow-band fusion terminal is in a measurement mode, the multi-mode wide/narrow-band fusion terminal measures a current main cell according to a measurement instruction sent by a main network, whether measurement on a wireless access system is required to be carried out is judged according to the result of S22, and if the wireless access system exists, the measurement is carried out on the wireless access system;
s24: the multi-mode wide/narrow band fusion terminal measures the receiving level quality of the wireless access system in a service operation scene, and writes the receiving level quality of the wireless access system into the RSRP in the measurement report; the measuring process is as follows: the method comprises the steps of alternately carrying out under the control of multimode wide/narrow band fusion terminal software, wherein the multimode wide/narrow band fusion terminal software is application software installed on a multimode wide/narrow band fusion terminal and is used for controlling a measurement process, carrying out protocol analysis, extracting index information from an extension field and a reserved field and finishing final mapping of the index information;
s25: initiating trial access through a multi-mode wide/narrow-band fusion terminal, counting the service quality of different wireless access systems, and writing the service quality of the wireless access systems into the RSRQ in a measurement report to form the measurement report;
the specific steps of S3 are as follows:
s31: determining a service diversion condition;
the service diversion conditions include: the quality of the receiving level of the wireless access system, the service quality of the wireless access system and the network state of the wireless access system;
s32: considering the quality of the reception level of a radio access system, P r ，P c ，P p ，P w N times of power statistical average respectively representing primary network, secondary network, public communication network and WiFi access point, when P is satisfied r >P min,r In which P is min,r Representing the lowest level that can access the active network, the multi-mode wide/narrow-band convergence terminal can access the active network when P is satisfied c >P min,c In which P is min,c Representing the lowest level capable of accessing the secondary network, the multi-mode wide/narrow band convergence terminal can access the secondary network when P is satisfied p >P min,p In which P is min,p Representing the lowest level of access to the public communication network, the multi-mode/narrowband convergence terminal is able to access the public communication network when P is satisfied w >P min,w In which P is min,w The lowest level which can be accessed to WiFi is represented, and the multi-mode wide/narrow-band fusion terminal can be accessed to WiFi;
s33: secondly, considering the service quality of a wireless access system;
s34: finally, consider the network state of the wireless access system: the network bearing capacity is good and is in a state of not being busy;
s35: when the service diversion conditions are all satisfied, service diversion is performed;
s36: the main network does not need to change the working mode of the main network, and the service distribution only needs to change the working mode of the multi-mode wide/narrow-band fusion terminal through the multi-mode wide/narrow-band fusion terminal software.
2. The multimode terminal control method supporting automatic shunting of railway radio service according to claim 1, wherein the multimode wide/narrow band convergence terminal is capable of automatically identifying a radio bearer network in which a scene is located; the dedicated narrowband module includes: GSM-R and DMR, the special broadband module includes: 5G-R and railway WiFi, the universal broadband module comprises: LTE, 5G and public WiFi;
the working mode of the multimode wide/narrow band fusion terminal is attached to a primary cell, a secondary cell or a selectable cell, the primary cell is a cell subordinate to a primary network, the secondary cell is a cell inferior to the primary cell only, the selectable cell is a potential accessible cell, and the wireless access system is a potential accessible cell.
3. The method for controlling a multimode terminal supporting automatic shunting of railway radio service according to claim 2, wherein the method for selecting an operation mode by the multimode wide/narrow band convergence terminal is as follows:
and the index fields are 01, 02 and 03, 01, 02 and 03 respectively represent a main network, a secondary network and an accessible network, information corresponding to the index fields is stored in the multi-mode wide/narrow-band fusion terminal or the main network, and when the information mapping of the index fields in the measurement report is completed, the multi-mode wide/narrow-band fusion terminal completes the selection of the working mode.
4. The multimode terminal control method supporting automatic shunting of railway radio service according to claim 3, wherein the service operation scenario comprises a primary network, a secondary network and an optional network, the primary network and the secondary network have a function of extracting network statistics performance, the optional network comprises a public communication network and a WiFi, the public communication network comprises a public broadband mobile communication network, and the WiFi comprises railway WiFi and public WiFi;
the special broadband network, the special narrowband network and the public broadband mobile communication network are cellular networks;
the business operation scene is a railway large-scale guest station, a marshalling station, a large-scale sports place, a large-scale commercial facility or a large-scale gathering;
the service request is sent without changing the protocol specification.
5. The multimode terminal control method supporting automatic traffic splitting of railway radio service according to claim 4, wherein the traffic splitting modes include a broadband traffic default splitting mode and a narrowband traffic default splitting mode;
the default splitting mode of the broadband service is as follows: the secure traffic and the high priority traffic are forked to the private broadband network and the non-secure traffic and the low priority traffic are forked to the public communication network;
the default split mode of the narrowband service is as follows: secure traffic and high priority traffic are split into dedicated narrowband networks and non-secure traffic and low priority traffic are split into public communication networks.
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