CN114745613A - Meter reading method for broadband carrier network - Google Patents
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- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/60—Arrangements in telecontrol or telemetry systems for transmitting utility meters data, i.e. transmission of data from the reader of the utility meter
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Abstract
The meter reading method of the broadband carrier network comprises the following steps: the CCO determines the time required by 1 time of downlink message transmission between the CCO and each target node and the time required by 1 time of uplink meter reading message transmission between each target node and the CCO; the CCO divides a superframe time slot structure and informs the whole network; one superframe includes a beacon slot area, a TDMA slot area and a CSMA slot area, the TDMA slot area includes a CCO slot area allocated to CCO and a target node slot area allocated to each target node; the CCO sends a downlink meter reading message in a CCO time slot area allocated to the CCO in the TDMA time slot area; each target node respectively sends an uplink meter reading message in a target node time slot area allocated to the target node; and the nodes still having the transmission requirements of the meter reading service related messages compete for transmitting signals in the CSMA time slot region according to the CSMA channel access mode. The invention improves the meter reading message transmission performance of the broadband carrier network.
Description
Technical Field
The invention belongs to the technical field of broadband carrier communication, and particularly relates to a meter reading method of a broadband carrier network.
Background
The meter reading is a specific service requirement of the electricity consumption information acquisition system, and the service flow is as follows: the central node sends a downlink meter reading message to the target node, wherein the message content indicates the relevant parameters of the service data of the meter reading at this time; each target node after receiving the downlink meter reading message reports the corresponding uplink meter reading message to the central node according to the requirement of the message content; after receiving the uplink meter reading message from the target node, the central node issues a receiving confirmation message to the target node. In accordance with the communication protocols of the current national and south networks, other types of network messages, except for beacon signals, can only use CSMA-type channel access schemes. The meter reading requirement may be triggered periodically or temporarily by the user in the management process. When the meter reading service is not triggered, the service load of the network is very low and the network is basically in an idle state. After the meter reading service is triggered, because the status of each node is the same, the network often needs to collect the meter reading data of all the nodes, which can cause the network service load to fluctuate greatly in a short time; moreover, all the destination nodes of the service data reported from the nodes are central nodes, and local blockage is easy to occur. Therefore, the CSMA type channel access scheme and the power consumption information acquisition network have poor matching performance with a business mode mainly based on meter reading business, the channel resource utilization efficiency is low in a network heavy-load business scene, the data acquisition effect is poor, and the user requirements cannot be completely met.
Disclosure of Invention
The invention aims to provide a meter reading method of a broadband carrier network, which improves the meter reading performance of the network by improving the channel access mode of meter reading service under the existing standard protocol frame, and does not increase the transmission delay and the channel overhead.
In order to achieve the purpose, the invention adopts the following technical solutions:
the meter reading method of the broadband carrier network comprises the following steps:
s1, the CCO determines the time needed for completing 1 downlink message transmission between the CCO and each target node, and the time is respectively recorded as TD1,TD2,…,TDPP is the number of target nodes;
s2, CCO determines the time needed for completing 1 time of uplink meter reading message transmission between each target node and the CCO, and the time is respectively recorded as TU1,TU2,…,TUP；
S3, CCO completes 1 time down message transmission according to time TD between itself and each target node1,TD2,…,TDPAnd the time TU required by each target node to finish 1 time of uplink meter reading message transmission1,TU2,…,TUPDividing the time slot structure of the superframe, and informing the time slot allocation condition to the nodes of the whole network; one superframe sequentially comprises a beacon time slot area, a TDMA time slot area and a CSMA time slot area, wherein the TDMA time slot area comprises 1 CCO time slot area allocated to CCO and P target node time slot areas allocated to each target node;
s4, the CCO sends a downlink meter reading message to the target node in the CCO time slot area of the TDMA time slot area which is allocated to the CCO;
s5, each target node sends an uplink meter reading message in the target node time slot area allocated to the target node in the TDMA time slot area;
and S6, in the time slot of the CSMA time slot area, the nodes still having the transmission requirement of the meter reading service related message compete for transmitting signals according to the CSMA channel access mode.
Further, the time length of the CCO timeslot zone is the sum of the time required for completing 1 downlink packet transmission between the CCO and each target node.
Further, the target node time slot region allocated to each target node is the time required for completing 1-time transmission of the uplink meter reading message between the target node and the CCO.
Further, in step S4, the channel resource utilization manner of the CCO timeslot area is: the CCO sends a downlink meter reading message, if a node receives a downlink meter reading message and is a next-hop receiving node of the downlink meter reading message but not a final destination node, the node sends a receiving confirmation message to a sending node of the received downlink meter reading message, and then immediately performs relay transmission of the downlink meter reading message; and if the node receiving the downlink meter reading message is the next hop receiving node of the downlink meter reading message and is the final destination node, sending a receiving confirmation message to the sending node of the received downlink meter reading message.
Further, in step S5, the channel resource utilization manner in the target node time slot region is as follows: if a target node needs to send an uplink meter reading message, the uplink meter reading message is sent temporarily by a time slot allocated to the target node in a TDMA time slot area, if other non-CCO nodes in the network receive the uplink meter reading message of which the source node is the target node and are the next-hop receiving nodes of the uplink meter reading message, a receiving confirmation message is sent to the sending node of the received uplink meter reading message, and then relay transmission of the uplink meter reading message is immediately carried out; and after receiving the uplink meter reading message, the CCO sends a receiving confirmation message to a sending node of the received uplink meter reading message.
Further, the target node is a non-central signal transmitting node of the superframe, when the target node is a proxy node, the CCO arranges it to transmit a proxy beacon signal, and when the target node is a slave node, the CCO arranges it to transmit a discovery beacon signal.
Further, the signaling content of the beacon signal used by the wideband carrier network includes a number of TDMA time slots allocated in the TDMA time slot area by the CCO and a number of TDMA time slots allocated in the TDMA time slot area by the pth non-central beacon signal transmitting node, where P is 1,2, …, P.
Further, the reserved bit in the non-central beacon information field in the time slot allocation information of the beacon signal is used for indicating the number of the TDMA time slots allocated to the p-th non-central beacon signal transmitting node in the TDMA time slot area.
Further, the reserved bit in the time slot allocation information of the beacon signal is used for indicating the TDMA time slot number allocated by the CCO in the TDMA time slot area.
According to the technical scheme, the method provided by the invention has the advantages that under the existing protocol frame and system, the signaling content of the beacon signal is improved, and the corresponding channel resources are reserved in the transmission process of the meter reading signal by adopting a new signaling content representation mode of the beacon signal and different time positions. The invention can ensure that the CCO finishes the whole meter reading process in a superframe, and is beneficial to reducing time transmission delay; and the pre-allocation of the time slot resource is realized by adopting a mode of modifying the definition of the signaling bit (reserved bit), compared with a mode of newly adding a field definition, the method of the invention can not increase the length of the signaling content, and can avoid the problems that the length of the signaling content is more than the maximum length of the signal signaling load and the channel overhead level of the signaling signal is increased when more meter reading nodes are caused by the increase of the signaling content.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a tree network topology of a broadband high-speed carrier communication network of a power consumption information acquisition system;
FIG. 2 is a schematic diagram of a superframe timeslot structure in "technical Specification for interconnection and interworking of Low Voltage Power line high speed Carrier communication";
fig. 3 is a signal structure diagram of a beacon signal;
FIG. 4 is a content definition diagram of non-central beacon information;
FIG. 5 is a schematic diagram of a network meter reading process;
FIG. 6 is a schematic diagram of a network superframe time slot structure during meter reading;
FIG. 7 is a schematic diagram of the channel resource utilization of CCO in the CCO time slot region of the TDMA time slot region;
FIG. 8 shows CCO and target node K1A multi-hop transmission path diagram of the downlink meter reading message between the two nodes;
FIG. 9 shows CCO and target node K1A multi-hop transmission timing chart of the downlink meter reading message is arranged between the two nodes;
FIG. 10 is a schematic diagram of the channel resource utilization of the CCO time slot area of the TDMA time slot area by the target node;
FIG. 11 shows a target node K1And a multi-hop transmission path diagram of the uplink meter reading message between the CCO and the CCO;
FIG. 12 shows a target node K1And a multi-hop transmission timing diagram of the uplink meter reading message between the CCO and the network side equipment.
Detailed Description
In describing the invention in detail and in conjunction with the drawings, the drawings showing the structure of the device are not to scale and are partially enlarged for the sake of illustration, when embodiments of the invention are described in detail, and the drawings are only exemplary and should not be considered as limiting the scope of the invention. It is to be noted, however, that the drawings are designed in a simplified form and are not to scale, but rather are to be construed in an attempt to more clearly and concisely illustrate embodiments of the present invention. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated; the terms "front," "back," "bottom," "upper," "lower," and the like refer to an orientation or positional relationship relative to an orientation or positional relationship shown in the drawings, which is for convenience and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1, the broadband carrier network of the power consumption information collection system is a multi-level association tree network that connects all Slave Stations (STAs) with a Central Coordinator (CCO) as a center and a Proxy Coordinator (PCO) as a relay agent. The CCO, as a central control node for network operation, uses a superframe slot structure based on a beacon period for network communication, while using a beacon signal to maintain synchronization and orderly operation of the entire network.
Fig. 2 is a time slot division of a superframe, wherein the superframe of a beacon period includes 4 types of time slots: a beacon slot region, a TDMA slot region, a CSMA slot region, and a bonded CSMA slot region. In the existing protocol, the TDMA time slot area and the binding CSMA time slot area are only used when the network is remotely upgraded, so that when the network normally communicates, the beacon period actually only comprises the beacon time slot area and the CSMA time slot area, and the lengths of the other two time slot areas are both 0.
The CCO achieves synchronized ordered management of the entire network slot structure by using beacon signals, of which there are 3 types: central beacons, proxy beacons, and discovery beacons. At the starting time position of each beacon period, the CCO starts to transmit a central beacon signal, and the signal signaling content of the CCO carries the timeslot parameter information of the beacon period and some other network management information. The time slot parameter information mainly comprises the time length of the beacon time slot, the number (X, Y and Z values) of the three types of beacon time slots, network short addresses (TEI) of Y + Z sending nodes corresponding to Y proxy beacon time slots and Z discovery beacon time slots one by one, and related parameters of a CSMA time slot area and a binding CSMA time slot area.
After one node in the network receives a beacon signal sent by another node, if it is found through signaling content analysis that the node is one of the Y + Z sending nodes and the beacon time slot allocated by the node is not yet available on the time axis, the node relays and sends an agent beacon signal or a discovery beacon signal on the time slot belonging to the node after the time of the beacon time slot is reached. Based on this mechanism and the selection of a suitable proxy relay node, the CCO can use the first X + Y + Z beacon slots to implement downlink full-network broadcast transmission of its beacon signaling information in one beacon period.
Fig. 3 is a signal structure of a beacon signal, which includes a preamble signal, a frame control signal, and a payload signal, as shown in fig. 3. The preamble signal is used for signal capture and synchronization, the signaling content of the frame control signal includes a network name, network time information and a physical layer format of the payload signal, and is used for helping a receiving end to correctly receive and analyze the content of the payload signal, and the frame control signal fixedly uses a physical block with the length of 16 bytes. The payload signal supports only one physical block of 136 bytes or 520 bytes in length. Table 1 is the definition of the load field of the beacon signal in the current network carrier protocol, table 2 is the definition of the beacon management information in the load field, table 3 is the definition of the management information type in the beacon management information, and table 4 is the definition of the timeslot allocation message in the management information type.
TABLE 1 definition of Beacon Signal payload field
Table 2 field definitions for beacon management messages
Table 3 type definition and content description of management messages
Table 4 content definition of slot assignment message field
According to the existing wideband carrier protocol, if the field 'TDMA time slot length' in table 4 is 0, the TDMA time slot zone length in this superframe is 0; if non-zero, the CCO gets 3 TDMA slots (A/B/C phase round-robin transmission), the other agent nodes get 1 TDMA slot each in turn, and the slot length is defined by the field 'TDMA slot length'. In the case of a non-zero 'TDMA slot length', the field 'TDMA slot link identifier' defines the type of service supported by the slot, and the current protocol defines only network software upgrade services.
As shown in fig. 4, the 'non-central beacon information' field has a length of a dynamic value, and carries information indicating allocation information of Y + Z non-central beacon slots, including an allocation node short address of a slot and a beacon type of the slot.
The content of the above protocols is integrated to discover that the channel access mode of the existing protocol has the following problems:
1) although a TDMA type time slot is designed in a superframe time slot structure of the network, the time slot is used for transmitting upgrade file data only in a network software upgrade state and cannot be used in a network normal operation state, so that the network efficiency is low;
2) in a normal operation state of the network, except for arranging corresponding time slot resources for transmission of beacon signals to perform conflict-free transmission, the CCO can only perform channel access in a CSMA time slot region in a competition mode for the rest network management messages and service data messages, and a certain collision risk exists under the condition of a multi-hop topology.
In order to improve the meter reading message transmission performance of a broadband carrier network, the invention modifies partial field definitions in a time slot distribution message field in the signaling content of a beacon signal under the framework of the existing protocol, and provides a mixed access scheme of TDMA + CSMA for the channel access process of the meter reading message, thereby realizing the on-demand scheduling of the contention-free channel resources in the transmission process of the business meter reading message in the network and greatly improving the meter reading performance and the comprehensive communication performance of the network.
The invention further adds a support service type-meter reading service to the 'TDMA time slot link identifier' field with the length of 8bit in the time slot distribution message field in the signaling content of the beacon signal on the basis of the existing protocol content, and the specific binary value corresponding to the 'TDMA time slot link identifier' field is 010101012 at the moment. And adding definition to the reserved bits without content in the non-central beacon information field in the time slot allocation information of the beacon signal, wherein the definition is as follows: the pth group of reserved bits is used to indicate the number of TDMA slots allocated by the pth non-central beacon signal transmitting node in the TDMA slot area, the length of the reserved bits is 3 bits, and the value range is 0-7, where P is 1,2, …, and P is the number of the target nodes, which is specifically shown in table 5.
TABLE 5 New definition of reserved bits in non-Central Beacon information
The invention also divides the reserved bit with the length of 16 bits before the field of 'non-central beacon information' in the time slot allocation message into two parts, one part is still reserved field with the length of 8 bits, and the other part is the TDMA time slot allocation information of CCO, which is used for indicating the TDMA time slot number allocated by CCO in the TDMA time slot area, as shown in table 6.
Table 6 new definition of partial reserved bits
On the basis of the old protocol, the invention brings the meter reading service message into a new service support type of a TDMA time slot area in a superframe time slot structure, and simultaneously provides a new time slot distribution scheme for the TDMA time slot area, thereby providing better channel resource guarantee for the transmission of the service message of the type. When the value of the TDMA time slot link identifier is not used for indicating meter reading service, the definition of all contents in the field of the time slot allocation message is consistent with that of the old protocol, and the existing protocol is completely compatible.
The meter reading service is a special service requirement of the intelligent electric meter communication network, and in the broadband carrier network, the CCO can periodically or in a triggering mode generate the meter reading requirement according to the requirement of a user. As shown in fig. 5, the flow of the meter reading service is as follows: the CCO sends a downlink meter reading message to an object to be meter read, wherein the message content carries the relevant parameters of the business data of the meter reading, such as the address information of the target node and the type and the size of the data required to be reported by the target node; after receiving the downlink meter reading message, if the meter reading object belongs to one member in the reporting node set, reporting a corresponding uplink meter reading message to the CCO according to requirements; after receiving the meter reading data message of a certain node, the CCO sends a receiving confirmation message to the CCO.
It can be seen from the above-mentioned meter reading process that the meter reading is actively initiated by the CCO, and at the same time, the CCO grasps the topology information of the whole network, and can accurately evaluate the signal transmission path of the whole meter reading process and the channel resources required by the nodes involved in the whole process, thereby allocating the TDMA time slot resources with the proper amount to the same nodes in the whole process, realizing the ordered and contention-free transmission of the meter reading service signals, and obtaining the better transmission performance than the pure CSMA contention access mode.
Based on the beacon signal, the meter reading method comprises the following steps:
s1, determining the time required by the CCO to finish 1 downlink message transmission between the CCO and each target node based on the network topology information and the data volume of the downlink meter reading message, and respectively recording the time as TD1,TD2,…,TDPWhen the target node is a proxy node, the CCO arranges the target node to send a proxy beacon signal, and when the target node is a slave node, the CCO arranges the target node to send a discovery beacon signal;
s2, the CCO determines the time required for completing 1-time transmission of the uplink meter reading message between each target node and the CCO based on the network topology information and the data volume of the uplink meter reading message, and the time is respectively recorded as TU1,TU2,…,TUP(ii) a Because the CCO grasps the topology information of the whole network and can accurately estimate the signal transmission path of the whole meter reading process and the channel resource required by the nodes involved in the whole process, the CCO can confirm to finish 1-time downlink message transmission andthe time required for completing 1 uplink message transmission is determined by the prior art, which is not an innovation of the invention and is not described herein again;
s3, based on the definition of the 'time slot allocation message' part field in the beacon signal, the CCO completes 1 time of downlink message transmission between itself and each target node according to the time TD1,TD2,…,TDPAnd the time TU required by each target node to finish 1 time of uplink meter reading message transmission1,TU2,…,TUPDividing the time slot structure of the superframe, and informing the time slot allocation condition to the nodes of the whole network; as shown in fig. 6, a beacon slot area, a TDMA slot area and a CSMA slot area are sequentially included in one superframe, wherein the TDMA slot area includes 1 CCO slot area allocated to CCO and P CCO slot areas allocated to each target node (K)1,K2,…,KPRepresenting individual target nodes), the time length of the CCO time slot area is the sum of the CCO and the time required for completing 1 downlink message transmission between each target node, i.e. equal to TD1+TD2+…+TDPThe time slot zone of the target node allocated to each target node is the time required for completing 1-time transmission of the uplink meter reading message between the target node and the CCO, such as the pth target node KpThe time length of the time slot zone of the allocated target node is TDp，p＝1,2,…,P；
S4, the CCO sends a downlink meter reading message to the target node in the CCO time slot area allocated to the CCO time slot area in the TDMA time slot area, and the channel resource utilization mode in the CCO time slot area is as follows: the CCO sends a downlink meter reading message, if a node receives the downlink meter reading message and is a next-hop receiving node of the downlink meter reading message but not a final destination node, the node sends a receiving confirmation message to a sending node and then immediately performs relay transmission of the downlink meter reading message; if the node is the next hop receiving node of the message and is the final destination node, a receiving confirmation message is sent to the sending node; according to the channel resource utilization mode, as a source node of a downlink meter reading message, a CCO node determines the sending time of the downlink meter reading message, and then after receiving the downlink meter reading message, a multi-hop relay transmission node completes receiving and confirming the sending of the message and then immediately carries out relay sending, so that signals in the multi-hop relay transmission process are closely connected on a time axis, and the high-efficiency utilization of time slot resources is realized while the conflict-free downlink signal sending process is ensured;
FIG. 7 is a schematic diagram of the channel resource utilization of the CCO time slot region of the TDMA time slot region, with CCO towards the target node K1To illustrate the case of sending a downlink meter reading message, CC0 → K in fig. 71Indicating CCO to target node K1In the multi-hop transmission process of sending the downlink meter reading message, assuming that a multi-hop transmission path of the downlink meter reading message between the CCO and the target node K1 is as shown in fig. 8, referring to fig. 9, a channel utilization mode of the CCO in the TD1 is specifically as follows: the CCO sends a downlink meter reading message to a relay transmission node R1, R1 receives the downlink meter reading message, the next hop receiving node of the downlink meter reading message is the R1, but the next hop receiving node is not the final destination node, and the relay transmission of the downlink meter reading message is carried out to R2 immediately after a receiving confirmation message is sent to the CCO; r2 receives the downlink meter reading message, which is the next hop receiving node of the downlink meter reading message but not the final destination node, and immediately relays and transmits the downlink meter reading message to K after sending a receiving confirmation message to R11Receiving a downlink meter reading message which is a next hop receiving node of the downlink meter reading message and is a final destination node, and sending a receiving confirmation message to R2; the channel utilization mode of the CCO in other timeslots of the CCO timeslot zone is the same, and is not described herein again;
s5, after the CCO time slot zone allocated to the CCO is finished, theoretically, P meter reading target nodes respectively receive the downlink meter reading messages from the CCO, when the target node time slot zone allocated to each target node comes, each target node sends the uplink meter reading messages, and the channel resource utilization mode in the target node time slot zone is as follows: if a target node E needs to send an uplink meter reading message, the uplink meter reading message is sent temporarily in a time slot allocated to the target node E, if other non-CCO nodes in the network receive the uplink meter reading message of which the source node is the target node E and are the next-hop receiving nodes of the uplink meter reading message, the relay transmission of the uplink meter reading message is immediately carried out after a receiving confirmation message is sent to a sending node (the target node E); after the CCO receives the uplink meter reading message, the CCO sends a receiving confirmation message to the sending node as the CCO is the final destination node of all the uplink meter reading messages; according to the channel resource utilization mode, as a source node of an uplink meter reading message, a target node immediately sends the uplink meter reading message when a TDMA time slot area allocated to the target node arrives, and then after receiving the message, a multi-hop relay transmission node immediately relays and sends the message after receiving and confirming the message, so that the transmission process of the downlink meter reading message is the same as that of the uplink meter reading message, signals in the multi-hop relay transmission process of the uplink meter reading message are also closely connected on a time axis, namely, the conflict-free uplink signal sending process is ensured, and the efficient utilization of time slot resources is also realized;
FIG. 10 shows the assignment of TDMA time slot zones to nodes K1The channel resource utilization mode of the target node time slot region is shown as a target node K1An example of sending the uplink meter reading message to the CCO is described, where K in fig. 101→ CC0 represent the target node K1A multi-hop transmission process of sending a downlink meter reading message to a CCO (central control unit) is carried out by assuming a target node K1The multi-hop transmission path of the uplink meter reading message between the target node and the CCO is shown in FIG. 11, FIG. 12, and a target node K1In TU1The channel utilization mode in time is as follows: target node K1Sending a downlink meter reading message to a relay transmission node R1, receiving the downlink meter reading message by R1, wherein the downlink meter reading message is a next hop receiving node of the downlink meter reading message but not a final destination node, and sending the downlink meter reading message to a target node K1After sending a receiving confirmation message, immediately relaying and transmitting the downlink meter reading message to R2; r2 receives the downlink meter reading message, which is the next hop receiving node of the downlink meter reading message but not the final destination node, and immediately relays and transmits the downlink meter reading message to K after sending a receiving confirmation message to R11Receiving a downlink meter reading message, wherein the downlink meter reading message is the next hop receiving node of the downlink meter reading messageThe point is a final destination node, and a receiving confirmation message is sent to R2; the rest of the target nodes K2,…,KPThe channel utilization mode in the time slot belonging to the self is the same, and the details are not described herein;
s6, after entering CSMA time slot area, if all nodes (including CCO and target node) of network have service transmission requirement, including but not limited to CCO needs to transmit receiving confirmation message to the node which is successful in meter reading, continue to adopt CSMA monitoring mechanism to carry out channel competition access.
Because the network meter reading process is influenced by a plurality of factors, such as incomplete signal multi-hop transmission process caused by insufficient length of TDMA time slot zones allocated to the CCO and meter reading target nodes by the CCO due to evaluation errors, signal retransmission caused by unstable physical layer links and the like, possibly causing that after the TDMA time slot zone allocated to the CCO by the superframe is finished, part of the uplink meter reading messages of the target nodes are not expected to be received, if the transmission requirement of the message related to the meter reading service still exists in the part of target nodes, the transmission of the uplink meter reading message can be continuously carried out in the subsequent CSMA time slot region, therefore, the nodes believe that the whole meter reading information interaction process can still be successfully completed, the service load level of the CSMA time slot area is effectively reduced, therefore, the success rate of the CSMA competition mechanism-based channel access process of the nodes is improved, and the data reading work of the rest target nodes can be quickly completed.
Theoretical analysis and simulation results show that under the scene that the number of network nodes is large and the service load is heavy, the CSMA type free competition type channel access protocol based on the channel monitoring and random back-off mechanism has low network throughput. Although some signaling overhead is introduced in the dynamic TDMA channel access scheme, the ordered and conflict-free channel resource guarantee can be provided for frequent information interaction among a large number of nodes, so that higher network throughput is obtained.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The meter reading method of the broadband carrier network is characterized by comprising the following steps of:
s1, the CCO determines the time needed for completing 1 downlink message transmission between the CCO and each target node, and the time is respectively recorded as TD1,TD2,…,TDPP is the number of target nodes;
s2, CCO determines the time needed for completing 1 time of uplink meter reading message transmission between each target node and the CCO, and the time is respectively recorded as TU1,TU2,…,TUP；
S3, CCO completes 1 time down message transmission according to time TD between itself and each target node1,TD2,…,TDPAnd the time TU required by each target node to finish 1 time of uplink meter reading message transmission1,TU2,…,TUPDividing the time slot structure of the superframe, and informing the time slot allocation condition to the nodes of the whole network; one superframe sequentially comprises a beacon time slot area, a TDMA time slot area and a CSMA time slot area, wherein the TDMA time slot area comprises 1 CCO time slot area allocated to CCO and P target node time slot areas allocated to each target node;
s4, the CCO sends a downlink meter reading message to the target node in the CCO time slot area of the TDMA time slot area which is allocated to the CCO;
s5, each target node respectively sends an uplink meter reading message in the target node time slot area allocated to the target node in the TDMA time slot area;
and S6, in the time slot of the CSMA time slot area, the nodes still having the transmission requirement of the meter reading service related message compete for transmitting signals according to the CSMA channel access mode.
2. The method of reading a meter in a broadband carrier network of claim 1, wherein: the time length of the CCO time slot area is the sum of the time required for completing 1 downlink message transmission between the CCO and each target node.
3. The method of reading a meter in a broadband carrier network of claim 1, wherein: and the target node time slot region allocated to each target node is the time required for completing 1-time transmission of the uplink meter reading message between the target node and the CCO.
4. The method of reading a meter on a broadband carrier network according to claim 1, wherein: in step S4, the channel resource utilization manner of the CCO timeslot zone is: the CCO sends a downlink meter reading message, if a node receives a downlink meter reading message and is a next-hop receiving node of the downlink meter reading message but not a final destination node, the node sends a receiving confirmation message to a sending node of the received downlink meter reading message, and then immediately performs relay transmission of the downlink meter reading message; and if the node receiving the downlink meter reading message is the next hop receiving node of the downlink meter reading message and is the final destination node, sending a receiving confirmation message to the sending node of the received downlink meter reading message.
5. The method of reading a meter on a broadband carrier network according to claim 1, wherein: in step S5, the channel resource utilization manner in the target node time slot region is: if a target node needs to send an uplink meter reading message, the uplink meter reading message is sent temporarily by a time slot allocated to the target node in a TDMA time slot area, if other non-CCO nodes in the network receive the uplink meter reading message of which the source node is the target node and are the next-hop receiving nodes of the uplink meter reading message, a receiving confirmation message is sent to the sending node of the received uplink meter reading message, and then relay transmission of the uplink meter reading message is immediately carried out; and after receiving the uplink meter reading message, the CCO sends a receiving confirmation message to a sending node of the received uplink meter reading message.
6. The method of reading a meter on a broadband carrier network according to claim 1, wherein: the target node is a non-central signal transmitting node of the superframe, when the target node is a proxy node, the CCO arranges the target node to transmit a proxy beacon signal, and when the target node is a slave node, the CCO arranges the target node to transmit a discovery beacon signal.
7. The method of reading a meter on a broadband carrier network according to claim 1, wherein: the signaling content of the beacon signal used by the broadband carrier network comprises a TDMA time slot number which indicates the allocation of the CCO in the TDMA time slot area and a TDMA time slot number which indicates the allocation of the P-th non-central beacon signal transmitting node in the TDMA time slot area, wherein P is 1,2, …, P.
8. The method of reading a meter over a broadband carrier network of claim 7, wherein: and adopting a reserved bit in a non-central beacon information field in the time slot allocation information of the beacon signal to indicate the number of the allocated TDMA time slots of the p-th non-central beacon signal transmitting node in the TDMA time slot area.
9. The method of reading a meter over a broadband carrier network of claim 7, wherein: and using a reserved bit in the time slot allocation information of the beacon signal to indicate the allocated TDMA time slot number of the CCO in the TDMA time slot area.
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