WO2009039780A1 - Transmisson control method, transmission method and device - Google Patents

Abstract

A transmission control method for communication with carrier sense multiple access (CSMA/CA) protocol, including: before the current transmission cycle ends, deciding whether the current transmission can be ended ahead; if YES, the current transmission cycle will be ended ahead. A transmission control device, a transmission method ,a transmission device and another transmission control method.

Description

 Transmission control method, transmission method and device

 The present application claims priority to Chinese Patent Application No. 200710153595.4, entitled "Transmission Control Method, Transmission Method and Apparatus", filed on September 19, 2007, the entire contents of in.

Technical field

 The present invention relates to the field of wireless communications, and in particular, to a transmission control method, a transmission method, and an apparatus. Background technique

 With the increasing entertainment life of people, the demand for home theater, video on demand and other applications is gradually increasing, and the application requirements for image quality are getting higher and higher; in order to avoid the picture delay of high-quality images, for wireless transmission technology The requirements are also increased accordingly.

 In the current wireless transmission technology, the network consists of a large number of independent nodes (Device, DEV), and each DEV can communicate with each other, and one of the DEVs serves as a coordination point (Piconet Coordinator, PNC) to provide basic timing and central control. Features.

 If the network uses the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism, the following transmission methods can be used:

 The PNC can determine the number of DEVs in the network in advance. The PNC assigns a value of the backoff counter to each DEV. The values of the DEV backoff counters are different and less than the total number of DEVs in the network.

The PNC determines a transmission period in which the communication time length is equal. At the beginning of each transmission period, the DEV starts the backoff process. If the channel is always empty in a contention time slot, the backoff counter is decremented by one, and when the backoff counter is reduced to zero, If no other node in the channel is transmitting data, the DEV can transmit data. If the channel is not idle, the DEV abandons the transmission.

 In the process of implementing the present invention, the inventors have found that the prior art has at least the following problems:

When the backoff counter of the DEV is reduced to zero and the channel is idle, the DEV can transmit data, but if the DEV finds that there is no data frame to send in its data queue, the DEV abandons the transmission, if within one transmission period, If no data frame is to be sent in the data queue of each DEV, each DEV will abandon the transmission in the transmission period, and each DEV must wait until the end of the transmission period before starting the next backoff process. Even if there is no data transmission, the DEV waits until the end of the transmission period, which causes loss of network throughput and increases access delay. In the process of waiting for the end of the transmission period, each DEV still has energy overhead, which affects network performance. When the backoff counter of the DEV is reduced to zero and the channel is idle, the DEV can transmit data. If the time when the DEV sends the data has exceeded the end time of the backoff time of other DEVs, the other DEV cannot access the channel to transmit data, and Each DEV must wait until the end of the transmission cycle before starting the next backoff process. Even if data transmission is impossible, the DEV waits until the end of the transmission period, which causes loss of network throughput and increases access delay. In the process of waiting for the end of the transmission period, each DEV still has energy overhead, which affects network performance. .

Summary of the invention

 An object of the embodiments of the present invention is to provide a transmission control method, a transmission method, and a device, which improve network throughput and network performance.

 Embodiments of the present invention provide a transmission control method, which is applicable to using carrier sense multiple access

A scenario in which the CSMA/CA mechanism communicates, the method includes: determining whether the current transmission period can be terminated early before the end of the current transmission period; if yes, ending the current transmission period in advance.

 The embodiment of the present invention further provides a transmission control apparatus, which is applicable to a scenario in which communication is performed by using a CSMA/CA mechanism, including: a determining unit, determining whether the current transmission period can be terminated early before the end of the current transmission period; If the judging unit determines that the current transmission period can be ended early, the current transmission period is terminated in advance.

 The embodiment of the present invention further provides a transmission method, which is applicable to a scenario in which communication is performed by using a CSMA/CA mechanism, and the method includes: before the end of the current transmission period, the node determines whether the condition for ending the transmission of data in the current transmission period is satisfied. If yes, the node sends an early end frame, wherein the early end frame is used to indicate that the node does not transmit data before the end of the current transmission period or the node enters a state of waiting for the end of the current transmission period.

 The embodiment of the present invention further provides a transmission apparatus, which is applicable to a scenario in which communication is performed by using a CSMA/CA mechanism, and includes: a determining unit, configured to determine, before the end of the current transmission period, whether the transmission of the data is completed in advance in the current transmission period. a condition; a control unit, configured to: if the determining unit determines that a condition for ending the transmission of data in the current transmission period is satisfied before the end of the current transmission period, sending an early termination frame, wherein the early termination frame is used to indicate The node no longer transmits data before the end of the current transmission period or the node enters a state of waiting for the end of the current transmission period.

The embodiment of the present invention further provides a transmission control method, including: receiving transmission information from a node for indicating a status of data transmission by a node; determining, according to the transmission information, a current transmission period Whether there is still data transmission within; if there is no data transmission in the current transmission period, the current transmission period is ended.

 With the transmission control method, transmission method and apparatus provided by the embodiment of the present invention, the transmission control apparatus can determine whether the current transmission period can be terminated early, and if it is determined to end early, the current transmission period is ended, and the next transmission period is started. In addition, the node in the network can judge whether the condition for ending the transmission of data in advance in the current transmission period is satisfied before the end of the current transmission period, and if so, the early termination frame is issued, so that the transmission control device can determine that the node is currently transmitting. There is no data to be transmitted during the period. When it is determined that all nodes have no data to transmit before the end of the current transmission period before the end of the current transmission period, the current transmission period can be terminated early and the next transmission period can be started. It can be seen that the embodiment of the invention improves the throughput of the network, reduces the access delay, and improves the performance of the network.

DRAWINGS

 1 is a schematic flow chart of Embodiment 1 of a transmission control method according to the present invention;

 2 is a schematic diagram of an operation flow of a coordination point in Embodiment 4 of the transmission control method of the present invention; FIG. 3 is a schematic diagram of an operation flow of a node in Embodiment 4 of the transmission control method of the present invention;

 4 is a schematic diagram of a normalized throughput rate curve of a transmission control method;

 5 is a schematic diagram of an average access delay curve of a transmission control method;

 6 is a schematic diagram of a transmission success rate curve of a transmission control method;

 Figure 7 is a schematic structural view of an embodiment of a transmission control device of the present invention;

 Figure 8 is a block diagram showing the structure of an embodiment of a transmission device of the present invention.

detailed description

 In the following embodiments, the transmission control device, which serves as a coordination point and provides basic timing and central control functions, determines a transmission period in which the communication time length is equal. At the beginning of each transmission period, the node starts the backoff process if the channel is in a competition. If the slot time is always empty, the backoff counter is decremented by one. When the backoff counter is reduced to zero and no other nodes in the channel are transmitting data, the node can transmit data. If the channel is not idle, the node abandons the transmission. The specific location of the transmission control device is not limited. For example, the transmission control device may be provided in a node that is a PNC or in another network-side device, such as a base station, a server, or the like.

First, the transmission control method of the embodiment of the present invention will be described. Transmission control of an embodiment of the present invention The method is applicable to a scenario in which communication is performed by using a CSMA/CA mechanism. The transmission control method includes: determining whether the current transmission period can be terminated early before the end of the current transmission period; if yes, ending the current transmission period in advance.

 Wherein, according to the obtained transmission information of each node, it can be judged whether the current transmission period can be terminated early, and the transmission information is used to indicate the status of the node transmitting data.

 Determining whether the current transmission period can be terminated early may be: determining whether a node needs to transmit data from the current time until the end of the current transmission period.

 The transmission control method will be described in detail below with reference to the accompanying drawings.

 Embodiment 1 of the transmission control method, referring to FIG. 1, the method includes:

 101. The transmission control device receives transmission information from the node for indicating a condition in which the node transmits data.

 The transmission information includes an early end frame (Period-End) or a data frame size or transmission time from the node, wherein the early end frame is used to indicate that the node no longer transmits data before the end of the current transmission period or the node enters waiting for the current transmission period. The state of the end, etc.

 102. According to the transmission information, the transmission control device determines whether there is data transmission in the current transmission period. If the transmission control device determines that there is no data transmission in the current transmission period, step 103 is performed; if the transmission control device determines that there is still Data transmission continues to receive or wait to receive transmission information from the node.

 The transmission control device can determine whether there is data transmission in the current transmission period according to the size or transmission time of the data frame to be transmitted by each node, and/or whether the early termination frame of the node is received.

 For example, the node broadcasts the data frame size that needs to be transmitted by itself or the transmission time required to transmit the data frame. After the transmission control device obtains the size or transmission time of the data frame that each node needs to transmit, it can calculate the need for each node to transmit the data frame. Time to determine whether the data that each node needs to transmit is transmitted.

If there is no data frame in the data queue of all nodes, the transmission control apparatus determines that there is no more data transmission in the current transmission period; if the transmission control apparatus determines that the data frame of the partial node is transmitted, and there is no data frame in the data queue of the remaining node, The transmission control apparatus determines that there is no more data transmission in the current transmission period; if the transmission control apparatus determines that the data frames of some nodes are transmitted, and the early termination frames of other nodes are received, and there are no data frames in the data queue of the remaining nodes, Transmission control device There is no more data transmission in the current transmission period; if the transmission control device determines that the data frame of the partial node is transmitted and receives the early termination frame of the remaining node, the transmission control apparatus determines that there is no more data transmission in the current transmission period.

 In addition, the transmission control device may further determine whether there is data transmission in the current transmission period according to the state of the channel. If the channel is faulty, the transmission control device may directly determine that there is no more data transmission in the current transmission period.

 When the node's backoff counter is reduced to zero, if the node satisfies the condition of early termination, an early end frame is issued.

 The condition that the node meets the early termination may be:

 If the node's backoff counter is reduced to zero, and the current channel is not idle, the node satisfies the condition of early termination; or, if the node's backoff counter is reduced to zero, and there is no data in the data queue, the node satisfies the condition of early termination. Or after the node sends the data frame, the other node can not send the data frame again in the current transmission period, then the node meets the condition of early termination.

 103. The transmission control device broadcasts a period end message, and the period end message is used to end the current transmission period. After the current transmission period ends, the next transmission cycle begins.

 Each node ends the current transmission period according to the period end message, and starts the next transmission period. The transmission control device may determine whether to terminate the current transmission period in advance according to the transmission information of the node, and if it is determined to end early, terminate the current transmission period, start the next transmission period, when the node has no data to transmit in the current transmission period or in the current transmission period. When data cannot be transmitted, the network throughput rate is improved by lowering the current transmission period in advance, the access delay is reduced, and the performance of the network is improved. The node that sent the early end frame enters the state of waiting for the end of the transmission cycle, thereby reducing the energy consumption of the node and improving the performance of the entire network.

 The second embodiment of the transmission control method is different from the first embodiment of the transmission control method in that, in this embodiment, the method further includes: before the start of the transmission transmission period, the transmission control apparatus according to the backoff Interframe Space, The short frame interval, the backoff slot length, the signaling transmission time, and the data frame transmission time determine the length of the transmission period.

 The length of the transmission period satisfies the following formula:

 T=BIFS+ ( N-1 ) *pBackoffSlot+2*SIFS+Tack+Tdata

Where BIFS indicates the back-off interframe space at the beginning of each transmission period; pBackoffSlot indicates The length of a backoff slot; SIFS indicates the short frame interval, which is used for transmission of signaling between the control device and the node; Tdata indicates the transmission time of the node data frame, and Tack indicates the transmission time of the transmission control node response frame. If the data frame length is constant, Tdata indicates the time required for the data frame to be transmitted. If the data frame length is changed, Tdata indicates the time required for the longest data frame to be transmitted.

 Embodiment 3 of the transmission control method is different from Embodiments 1 and 2 of the transmission control method in that, in this embodiment, the method further includes: before the start of the transmission period, the transmission control apparatus allocates each node according to the number of nodes in the network. The way to back off. Each node performs backoff at the same time at the beginning of the transmission period. Since the backoff modes of the nodes are different, the time for each node to transmit data frames is also different, thereby avoiding the collision of data transmitted by each node, improving the throughput of the network, and improving the network. Network performance.

 The method of assigning each node to backoff can be as follows:

 Set the value of the backoff counter of each node to 0, 1, 2 N-1, and take N transmission cycles as one cycle. In each transmission cycle of the same cycle, the value of the node backoff counter is different from the value of the previous transmission cycle. N is the number of nodes in the network.

 以上 Using the above backoff mode, each node accesses the channel with a different backoff counter value in one cycle, thereby ensuring the fairness of each node accessing the channel; meanwhile, since the value of the backoff counter is

0, 1, 2 N-1, there is a node access channel in each backoff slot, so the channel is fully utilized, and the throughput of the network is improved.

 Of course, in addition to the above-mentioned back-off mode, other back-off methods can be used as long as the collision time of each node does not collide. For example, the value of the back-off counter of each node can be set to 2, 3, 4, , N+l.

 Embodiment 4 of the transmission control method, the first, second, and third embodiments of the transmission control method are applied to a wireless personal area network (WPAN), and a plurality of independent DEVs form a piconet (Piconet), allowing DEVs between Communicating with each other, one of the DEVs is taken as a PNC, and in the present embodiment, the transmission control means is set in the PNC.

 Referring to FIG. 2, in this embodiment, the operation steps of the PNC include:

 201. During the establishment phase of the Piconet, the PNC calculates the total number of DEVs in the network;

202. The PNC determines a backoff mode of the node, that is, determines a backoff counter value of each DEV in the network, so that each DEV has a unique backoff counter value at any time. For example, back off The value of the counter is 0, 1, 2 N-1, and N represents the total number of DEVs. The PNC sets the values of these backoff counters in turn for each DEV. With N transmission periods as one cycle, the value of the DEV backoff counter is different from the previous transmission period in each transmission cycle of the same cycle, so that each DEV can be guaranteed to access the channel fairly;

 203. The PNC calculates the length of each transmission cycle:

 T=BIFS+ ( N-1 ) *pBackoffSlot+2*SIFS+Tack+Tdata

 BIFS indicates the back-off interframe space at the beginning of each transmission period; pBackoffSlot indicates the length of one back-off slot; SIFS indicates the short-frame interval, which is used for transmission of signaling between the control device and the node; Tdata indicates node The transmission time of the data frame, Tack represents the transmission time of the transmission control node response frame. If the data frame length is fixed, Tdata indicates the time required for the data frame to be transmitted. If the data frame length is changed, Tdata indicates the longest data frame transmission. The time required.

 204. The backoff mode and the length of the transmission period of the PNC broadcast node;

 205, the PNC waits for the end of the transmission period, if the transmission information of the DEV is received, step 206 is performed; if the transmission information of the DEV is not received, step 207 is performed;

 206, the PNC sends a response frame (Imm-ACK) to the DEV, and then returns to step 205;

 207, determine whether the conditions for ending the current transmission period are met, if yes, step 208 is performed, if not, then return to step 205;

 If it is judged that there is no more data transmission in the current transmission period, it is determined that the condition for ending the current transmission period is met; or, if the end time of the current transmission period has elapsed, it is determined that the condition for ending the current transmission period is met.

 If there is no data frame in the data queue of all nodes, the PNC determines that there is no more data transmission in the current transmission period; if it is determined that the data frame of some nodes is transmitted, and there is no data frame in the data queue of the remaining nodes, the PNC determines the current transmission. There is no more data transmission in the period; if it is determined that the data frames of some nodes are sent, and the early end frames of other nodes are received, and there is no data frame in the data queue of the remaining nodes, the PNC judges that there is no more data in the current transmission period. Transmission; If it is judged that the data frame of some nodes is transmitted and the early end frame of the remaining nodes is received, the PNC judges that there is no more data transmission in the current transmission period.

 208. End the current transmission period and start transmission of the next transmission period.

In addition to the foregoing transmission control method, an embodiment of the present invention provides an embodiment of a transmission method. This hair The transmission method of the embodiment is applicable to a scenario in which communication is performed by using a CSMA/CA mechanism, and the transmission method includes: before the end of the current transmission period, the node determines whether the condition for ending the transmission of data in the current transmission period is satisfied; if yes, Then, the node sends an early termination frame, where the early termination frame is used to indicate that the node does not transmit data before the end of the current transmission period or the node enters a state of waiting for the end of the current transmission period.

 The condition for ending the transmission of the data in advance includes: when the backoff counter of the node is reduced to zero, the current channel is not idle; or, when the backoff counter of the node is reduced to zero, the node has no data to transmit; or After the node sends the data frame, the other nodes cannot send the data frame again during the current transmission period.

 The node can determine the backoff mode of the coordination point allocation before determining whether the condition for ending the transmission of data in the current transmission period is satisfied. At the beginning of the current transmission period, the node starts the backoff counting according to the obtained backoff mode.

 The transmission method of the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

 Referring to FIG. 3, in this embodiment, the operation steps of the DEV include:

 301. At the beginning of each transmission period, the DEV monitors the duration of the channel BIFS, determines that no other node is transmitting data, and the channel is idle. Then, the DEV determines the value of its own backoff counter according to the notification of the PNC;

 302. Each time a pBackoffSlot is passed, the backoff counter of the DEV is decremented by one;

 303, determining whether the backoff counter is equal to zero, if the backoff counter is not equal to zero, then returning to step 302, otherwise, performing step 304;

 304, determining whether the current channel is idle, if the channel is idle, then go to 305, otherwise go to 310;

305. Determine whether there is unsent data in the data queue, if yes, go to 306, otherwise go to 310;

 306. Send data;

 307. Wait for an Imm-ACK frame.

 308, determine whether the Imm-ACK frame is received, if the Imm-ACK frame is received, go to 309, otherwise return to step 307;

309. Determine whether the node meets the test condition, where the test condition includes that the initial backoff counter value of the node in the current transmission period is not equal to N-1, and the inequality Tcur-Tstar>BIFS+(Nl)* is satisfied. pBackoffSlot, if the node meets the test condition, go to 310, otherwise go to 311, where Tcur represents the current time and Tstar represents the current transmission cycle start time;

 310, send the early end frame, and go to 311;

 311. Wait for the current transmission period to end. Set up the simulation model, consisting of ten DEVs and one PNC, which are randomly distributed in a rectangular area of lOmxlOm. Assume that the channel is error-free, all errors in the data frame are caused by collisions, and the data rate is lGbps. Compared with the prior art, a Memorized Backoff Scheme (MBS) transmission control method, a CSMA/CA transmission control method, and a Short Unique Backoff Allocation (SUBAA) transmission control method, The transmission control method provided in each embodiment has a high throughput rate, a small average access delay, and a high transmission success rate.

 The throughput rate, average access delay, and transmission success rate are described below.

 The normalized throughput rate represents the ratio of network throughput to data rate. Referring to FIG. 4, a schematic diagram of a normalized throughput rate curve of a transmission control method, wherein a curve 401 represents a normalized throughput rate of the transmission control method in the embodiment of the present invention, and a curve 402 represents a SUBAA transmission control method. Normalized throughput rate, curve 403 represents the normalized throughput rate of the MBS transmission control method, and curve 404 represents the normalized throughput rate of the CSMA/CA transmission control method. The abscissa in FIG. 4 represents the data rate, and the ordinate represents the normalized throughput rate. As shown in FIG. 4, the normalized throughput rate of the transmission control method in the embodiment of the present invention is always greater than the other three transmission control methods. The normalized throughput rate, and the higher the data rate, the greater the normalized throughput rate of the transmission control method in the embodiment of the present invention relative to the other three transmission control methods. It can be seen that the transmission control method in the embodiment of the present invention can improve the network throughput rate and improve the network performance, especially when the network load is large and the data rate is large, the network performance can be greatly improved.

The average access delay represents the average delay elapsed from the creation of the data frame to the transmission. Referring to FIG. 5, it is a schematic diagram of an average access delay curve of a transmission control method, wherein a curve 501 represents an average access delay using the transmission control method in the embodiment of the present invention, and a curve 502 represents a SUBAA transmission control method. The average access delay, curve 503 represents the average access delay for the MBS transmission control method, and curve 504 represents the average access delay for the CSMA/CA transmission control method. The abscissa in Figure 5 Indicates the time from the creation to the transmission of the data, and the ordinate indicates the average delay. As shown in FIG. 5, the average access delay of the transmission control method in the embodiment of the present invention is always smaller than the average connection of the SUBAA transmission control method. In the case of the delay, the average access delay of the MBS transmission control method, the average access delay of the transmission control method in the embodiment of the present invention when the time from data creation to transmission is between 0.4 and 0.9 Less than the average access delay of the CSMA/CA transmission control method. It can be seen that, by using the transmission control method in the embodiment of the present invention, the average access delay can be reduced, and the network performance can be improved.

 The transmission success rate represents the ratio of the number of data frames successfully transmitted to the total number of data frames transmitted. 6 is a schematic diagram of a transmission success rate curve of a transmission control method, wherein a curve 601 represents a transmission success rate of the transmission control method in the embodiment of the present invention, and a curve 602 represents a transmission success rate of the SUBAA transmission control method. Curve 603 represents the transmission success rate of the MBS transmission control method, and curve 604 represents the transmission success rate of the CSMA/CA transmission control method. The abscissa in FIG. 6 represents the number of data frames successfully transmitted, and the ordinate represents the total number of data frames transmitted. As shown in FIG. 6, the transmission success rate of the transmission control method in the embodiment of the present invention is 100%. It can be seen that, by using the transmission control method in the embodiment of the present invention, data can be transmitted completely successfully, and the network performance is good.

 In addition to the above transmission control method and transmission method, the embodiment of the present invention further provides a transmission control device and a transmission device.

 The transmission control apparatus according to the embodiment of the present invention is applicable to a scenario in which communication is performed by using a CSMA/CA mechanism, including: a determining unit, determining whether the current transmission period can be terminated early before the end of the current transmission period; and a control unit, if the determining The unit determines that the current transmission period can be terminated early, and the current transmission period is terminated earlier.

 The transmission control apparatus may further include a receiving unit, configured to obtain transmission information sent by each node before the determining unit determines whether the current transmission period can be terminated early, and the determining unit obtains each of the obtained by the receiving unit. The transmission information sent by the node determines whether the current transmission period can be terminated early, wherein the transmission information is used to indicate the status of the node transmitting the data.

 When the judging unit judges whether the current transmission period can be terminated early, it can be determined whether there is a node that needs to transmit data from the current time until the end of the current transmission period.

 The transmission control apparatus may further include an allocating unit configured to allocate a backoff mode of each node according to the number of nodes in the network before the determining unit determines whether the current transmission period can be terminated early.

The transmission control apparatus according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings. See Figure 7, The transmission control device includes:

 The receiving unit 701 is configured to receive transmission information from the node.

 The determining unit 702 is configured to determine, according to the transmission information, whether there is still data transmission in the current transmission period;

 The control unit 703 is configured to: when the judgment result of the determining unit 702 is that there is no data transmission, the broadcast period end message is used, and the period end message is used to end the current transmission period.

 The transmission information includes: an early end frame or a data frame size or a transmission time from the node. Further, the transmission control apparatus may further include: means for determining a length of the transmission period according to the backoff interframe interval, the short frame interval, the backoff slot length, the signaling transmission time, and the data frame transmission time.

 Further, the transmission control apparatus may further include: an allocating unit, configured to allocate a backoff mode of each node according to the number of nodes in the network.

 Further, the allocating unit specifically includes: a value of 0 for setting a backoff counter of each node,

1, 2 N-1, with N transmission periods as one cycle, in each transmission cycle of the same cycle, the value of the node backoff counter is different from the value of the previous transmission cycle, and N is the number of nodes in the network.

 The transmission device of the embodiment of the present invention is applicable to a scenario in which communication is performed by using a CSMA/CA mechanism, and includes: a determining unit, configured to determine, before the end of the current transmission period, whether a condition for ending the transmission of data in the current transmission period is satisfied; And if the determining unit determines that the condition for ending the transmission of the data in the current transmission period is satisfied before the end of the current transmission period, sending an early termination frame, where the early termination frame is used to indicate that the node is currently transmitting No data is transmitted before the end of the cycle or the node enters a state waiting for the end of the current transmission cycle.

 The transmitting device may further include a receiving unit, configured to obtain a backoff mode allocated by the coordination point before the determining unit determines whether the condition for ending the data transmission in the current transmission period is satisfied, and at the beginning of the current transmission period, The control unit starts the backoff count according to the obtained backoff mode.

 The transmission device shown in Figure 8 is a preferred embodiment, see Figure 8, including:

 a determining unit 801, configured to determine whether a condition for ending early is satisfied;

 The control unit 802 is configured to send an early end frame under the condition that the judgment result of the determining unit 801 is that the early end is satisfied.

Further, the determining unit 801 of the transmission device may include: a backoff counter, used for initial The backoff value starts to decrease to zero;

 a detecting module, configured to detect whether the current channel is idle, or whether there is data in the data queue, or whether the other transmitting device retransmits the data frame in the current transmission period;

 a control module, configured to: when the backoff counter is reduced to zero and the detecting module detects that the current channel is not idle, or when the backoff counter is reduced to zero and the detecting module detects that there is no data in the data queue, or when the detecting module detects other The transmitting device determines that the early termination condition is satisfied when the data frame cannot be retransmitted within the current transmission period.

 In the transmission control method and the transmission control apparatus according to the embodiment of the present invention, if the transmission control apparatus determines that the current transmission period can be terminated early, the transmission control apparatus ends the current transmission period in advance, so that each node does not have to wait until the end of the current transmission period to start. A backoff process, which improves network throughput, reduces energy overhead for each node, and improves network performance.

 A person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium, such as: In execution, the method may include the following steps: receiving transmission information from the node; determining, according to the transmission information, whether there is still data transmission in the current transmission period; if there is no data transmission, transmitting a period end message, the period ending message For ending the current transmission cycle, the storage medium, such as: ROM/RAM, disk, optical disk, and the like.

 The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

Claims

Rights request  A transmission control method, which is characterized in that it is applicable to a scenario in which a carrier sense multiple access access CSMA/CA mechanism is used for communication, and the method includes:  Before the end of the current transmission period, it is judged whether the current transmission period can be ended early; if so, the current transmission period is ended earlier.  The control method according to claim 1, wherein determining whether the current transmission period can be terminated early is: determining whether the current transmission period can be terminated early according to the obtained transmission information of each node, wherein, the transmission Information is used to indicate the status of the node transmitting data.  The control method according to claim 2, wherein the transmission information comprises: an early end frame from a node or a data frame size to be transmitted or a transmission time required to transmit data, wherein the frame is terminated early Indicates that the node no longer transmits data or the node enters a state waiting for the end of the current transmission period before the end of the current transmission period.  The control method according to claim 1, characterized in that determining whether the current transmission period can be terminated in advance is specifically: determining whether there is a node to transmit data from the current time until the end of the current transmission period.  The control method according to claim 1, wherein the method further comprises: determining whether the backoff mode of each node is allocated according to the number of nodes in the network before the current transmission period can be terminated earlier.  6. A transmission control apparatus, characterized by being applicable to a scenario in which communication is performed using a CSMA/CA mechanism, including:  The determining unit determines whether the current transmission period can be terminated early before the end of the current transmission period; and the control unit is configured to end the current transmission period beforehand if the determining unit determines that the current transmission period can be terminated early.  The transmission control apparatus according to claim 7, further comprising: a receiving unit, configured to obtain, after the determining unit determines whether the current transmission period can be terminated early, obtaining transmission information sent by each node, The judging unit judges whether the current transmission period can be terminated in advance according to the transmission information sent by each node obtained by the receiving unit, wherein the transmission information is used to indicate the status of the node transmitting data. The transmission control device according to claim 6 or 7, wherein the judgment sheet When determining whether the current transmission period can be terminated early, the element judges whether there is a node that needs to transmit data from the current time until the end of the current transmission period.  The transmission control apparatus according to claim 6, further comprising: an allocating unit, configured to allocate each node according to the number of nodes in the network before the determining unit determines whether the current transmission period can be terminated early The way to back off.  10. A transmission method, characterized by being applicable to a scenario for communicating using a CSMA/CA mechanism, the method comprising:  Before the end of the current transmission period, the node determines whether the condition for ending the transmission of data in advance in the current transmission period is satisfied;  If so, the node issues an early end frame, wherein the early end frame is used to indicate that the node no longer transmits data before the end of the current transmission period or the node enters a state of waiting for the end of the current transmission period.  The transmission method according to claim 10, wherein the condition for ending the transmission of the data early comprises:  When the backoff counter of the node is reduced to zero, the current channel is not idle; or  When the backoff counter of the node is reduced to zero, the node has no data to transmit; or after the node sends the data frame, the other node cannot send the data frame again in the current transmission period. The transmission method according to claim 10, wherein the node determines whether the condition for ending the transmission of the data in the current transmission period is satisfied, and the backoff mode of the coordination point allocation is also obtained, at the beginning of the current transmission period. The node starts the backoff count according to the obtained backoff mode.  13. A transmission device, characterized by being applicable to a scenario for communicating using a CSMA/CA mechanism, comprising:  a determining unit, configured to determine, before the end of the current transmission period, whether a condition for ending the transmission of data in the current transmission period is satisfied;  a control unit, configured to: if the determining unit determines that the condition for ending the transmission of data in the current transmission period is satisfied before the end of the current transmission period, sending an early termination frame, where the early termination frame is used to indicate that the node is No data is transmitted before the end of the current transmission period or the node enters a state of waiting for the end of the current transmission period. 14. The transmission device according to claim 13, further comprising: a receiving unit, And determining, by the determining unit, a backoff mode of the coordination point allocation before determining whether the condition for ending the transmission of the data in the current transmission period is satisfied. When the current transmission period starts, the control unit starts the backoff counting according to the obtained backoff mode. .  15. A transmission control method, comprising:  Receiving transmission information from the node for indicating the status of the node transmitting data;  According to the transmission information, it is determined whether there is still data transmission in the current transmission period; if there is no data transmission in the current transmission period, the current transmission period is ended.  The transmission control method according to claim 15, wherein the transmission information includes a size or a transmission time of a data frame to be transmitted by the node.  The transmission control method according to claim 15, wherein the transmission information includes an early end frame generated by the node.