CN101001240B - Transmission control method and device - Google Patents
Transmission control method and device Download PDFInfo
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- CN101001240B CN101001240B CN 200610006342 CN200610006342A CN101001240B CN 101001240 B CN101001240 B CN 101001240B CN 200610006342 CN200610006342 CN 200610006342 CN 200610006342 A CN200610006342 A CN 200610006342A CN 101001240 B CN101001240 B CN 101001240B
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Abstract
This invention relates to a transmission method and device used in radio terminal, in which, the method includes: setting up communication connection with another terminal on a radio link from the terminal to another, transmitting data of preset volume to the other radio terminal via the communication connection based on the size of the transmitting window, setting a mode of said communication connection based on the state information of said link and determining data transmission via the connection afterwards according to the transmit result information and connection mode, which can applies different data transmission strategies according to different states of radio link.
Description
Invention field
The present invention relates generally to mobile ad-hoc network, relate in particular to transfer control method and device for the wireless terminal of mobile ad-hoc network.
Background technology
Self-organizing network originates from the nineteen sixty-eight ALOHA network network set up for the educational alternative that connects school of Hawaii, America university.On this basis, DARPA in 1973 multi-hop grouping wireless electric network (PRNet:Packet Radio Network) that begins one's study, specifically see also J.Jubin and J.D.Tornow, " The DAPRA Packet Radio Network Protocol ", Proc.Ofthe IEEE, vol 75, No.1, Jan 1987, pp.21-32.IEEE renames as Ad Hoc network with PRNet when exploitation IEEE 802.11 standard.IETF in 1997 has set up mobile ad-hoc network (MANET:Mobile Ad Hoc Network) working group, is responsible for the research and development of the routing algorithm of the mobile ad-hoc network with hundreds of nodes specially, carries out corresponding standardization effort.
Mobile ad-hoc network is a kind of by the spontaneous distributed communication network that forms of a plurality of wireless terminals.In mobile ad-hoc network, need to be such as the such forwarding unit in the base station in conventional cellular mobile communication networks (perhaps AP), any two adjacent wireless terminals are directly set up the communication link of " end-to-end ".And, in mobile ad-hoc network, there is no the so special-purpose routing device of switch and router, each wireless terminal has the function of route switching, and the Radio Link that can set up, be maintained into other wireless terminals also is its adjacent wireless terminal forwarding data.And then when non-conterminous any two wireless terminals need to be communicated by letter, itself can search for the effective Radio Link via other wireless terminals dynamically, and mutually transmits data in the mode of " multi-hop " via this effective Radio Link.
In network, the data transmission method between terminal can be divided into two types, i.e. connection-oriented transmission method and connectionless transmission method.Connection-oriented data transmission method usually offers for accuracy and requires higher reliability services.In mobile ad-hoc network, the data transmission method that offers reliability services is the transfer control method for the routine of the wired type network of tradition.
When occurring the loss of data phenomenon in data transmission procedure, conventional transfer control method usually all with this phenomenon owing to network congestion, namely think to cause input rate to cause greater than output speed by the disposal ability deficiency of certain terminal node in transmission link, therefore, conventional transfer control method all adopts congestion avoidance mechanism to solve for the loss of data phenomenon of each appearance.
Traditional wired type network uses conventional transfer control method, really can promote well transmission performance and the efficient of network, because in traditional wired type network, the situation overwhelming majority of loss of data is all because network congestion causes.
But mobile ad-hoc network uses conventional transfer control method, can not obtain the good result that traditional wired type network produces.This be because, in mobile ad-hoc network, except the network congestion meeting causes occurring loss of data, due to the movement of terminal node, share transmission of radio links data and Radio Link easily the Radio Link Loss that occurs affected by environment, Radio Link is used by a plurality of data contentions and collision phenomenon and transfer of data high bit-error phenomenon, the capital causes occurring in transmitting procedure the situation of loss of data, and for the loss of data that is caused by these phenomenons, use simply congestion avoidance mechanism can not promote transmission performance and the efficient of network.
Therefore, need to propose a kind of transfer control method and device, to address the above problem.
Summary of the invention
The object of the present invention is to provide a kind of transfer control method and device.Utilize this transmission method and device, when being used by a plurality of data contentions due to Radio Link Loss, Radio Link and collision phenomenon and transfer of data high bit-error phenomenon when causing loss of data, can promote efficiency of transmission and the performance of network.
In order to realize purpose of the present invention, according to a kind of transfer control method of carrying out in wireless terminal of the present invention, comprise the following steps:
(a) establish a communications link with described another wireless terminal to the Radio Link of another wireless terminal at described wireless terminal;
(b) according to the send window size of setting, send the data of predetermined quantity to described another wireless terminal via described communication connection;
(c) according to the state information of described Radio Link, the pattern of described communication connection is set; And
(d) when receiving the transmission object information of described data, according to the pattern of described transmission object information and described communication connection, determine subsequently to send via the data of described communication connection.
In order to realize purpose of the present invention, according to a kind of transmission control unit for wireless terminal of the present invention, comprising:
Set up module, it establishes a communications link with described another wireless terminal to the Radio Link of another wireless terminal at described wireless terminal;
Sending module, it sends the data of predetermined quantity according to the send window size of setting to described another wireless terminal via described communication connection;
Module is set, and it arranges the pattern of described communication connection according to the state information of described Radio Link; And
Determination module, when receiving the transmission object information of described data, it is according to the pattern of described transmission object information and described communication connection, determines subsequently to send via the data of described communication connection.
Because the state of transfer control method of the present invention and the device transmission object information of based on data and Radio Link is determined subsequently data transmission, therefore, transfer control method of the present invention and device can be taked different data transmission policies according to the different conditions of Radio Link, make it possible to promote efficiency of transmission and the performance of network.
The accompanying drawing summary
Fig. 1 is the TCP/IP network model of realizing transfer control method of the present invention according to first embodiment of the invention;
Fig. 2 is the schematic diagram according to the mobile ad-hoc network of first embodiment of the invention;
Fig. 3 is the flow chart according to the transfer control method of first embodiment of the invention;
Fig. 4 A-4C is the detail flowchart that the state information according to Radio Link of first embodiment of the invention arranges the pattern of TCP connection;
Fig. 5 A-5C be first embodiment of the invention according to the detail flowchart that sends pattern that object information is connected with TCP and determine the subsequent data transmission;
Fig. 6 be second embodiment of the invention determine according to sending times N the flow chart that subsequent data sends;
Fig. 7 be third embodiment of the invention manage according to route search number of times M the flow chart that TCP connects CON1.
Detailed Description Of The Invention
Main thought of the present invention is: wireless terminal arranges the pattern of this communication connection according to the state of the Radio Link of the communication connection between carrying itself and other wireless terminal; Then, when the transmission object information of receiving the data that send via this communication connection (correct ACK, repeat ACK or ACK wait timeout), wireless terminal is determined subsequently data transmission according to the pattern of this transmissions object information and this communication connection.
Describe each specific embodiment of the present invention in detail below in conjunction with accompanying drawing.
(the first embodiment)
1-5C describes the first embodiment of the present invention in detail below in conjunction with accompanying drawing.
Fig. 1 is the TCP/IP network model of realizing transfer control method of the present invention according to first embodiment of the invention, wherein, the transport layer of the TCP/IP network model of first embodiment of the invention adopts Transmission Control Protocol, and network layer adopts AODV (Ad Hoc On-Demand DistanceVector) Routing Protocol.As shown in Figure 1, the TCP/IP network model of this first embodiment is compared with the TCP/IP network model of routine, has increased by one across transport layer and network layer and the connection management module M1 that realizes.This connection management module M1 is used for the state information according to Radio Link, such as Radio Link open circuit, Radio Link is used by a plurality of data contentions and collision etc., and the pattern that TCP that this Radio Link carries connects (communication connection) is set.In this first embodiment, the TCP that sets up between two wireless terminals connects (communication connection) and has four kinds of patterns: (1) normal mode (Normal Mode), when transfer of data mistake do not occur, the TCP connection is in normal mode, according to the Transmission Control Protocol work of standard; (2) the Radio Link pattern (BL Mode) that opens circuit, the Radio Link that this TCP of expression carrying connects is in off state; (3) Radio Link competition crash mode, the Radio Link that this TCP of expression carrying connects is used and bumps by a plurality of data contentions in data link layer; And (4) disturb packet loss pattern (Loss Mode), the Radio Link that this TCP of expression carrying connects due to error rate eminence in easy obliterated data state.
Fig. 2 is the schematic diagram according to the mobile ad-hoc network of first embodiment of the invention.As shown in Figure 2, this mobile ad-hoc network comprises wireless terminal 1-6 and 10, wherein, these wireless terminals all adopt TCP/IP network model shown in Figure 1, and have three wireless links between wireless terminal 1 and 10, that is: via the Radio Link L1 of wireless terminal 2, via the Radio Link L2 of wireless terminal 3 and via the Radio Link L3 of wireless terminal 4 and 5.
The below is take wireless terminal shown in Figure 21 as example, describes transfer control method according to first embodiment of the invention in conjunction with Fig. 3 to flow chart shown in Figure 7.
As shown in Figure 3, the transport layer of wireless terminal 1 is set up TCP with wireless terminal 10 on via the Radio Link L1 of wireless terminal 2 and is connected CON1 (communication connection) (step S10).According to the send window size of setting, the transport layer of wireless terminal 1 connects CON1 to the data (step S20) of wireless terminal 10 transmission predetermined quantities by the TCP of this foundation.
The connection management module M1 of wireless terminal 1 obtains the state information (step S30) of Radio Link L1.In the first embodiment, the connection management module M1 of wireless terminal 1 has two kinds of approach to obtain the state information of Radio Link L1.
In the first approach, when wireless terminal 1 sends data failure to the adjacent wireless terminal 2 on Radio Link L1, the network layer of wireless terminal 1 will receive that the data from data link layer send failure notification, these data send failure notification and show that the connection management module M1 of wireless terminal 1 sends according to these data the state information that failure notification is determined Radio Link L1 to wireless terminal 2 transmission data failures.For example, this connection management module M1 can utilize the positional information of the wireless terminal 2 that is kept in wireless terminal 1, and whether the distance of calculating between wireless terminal 1 and wireless terminal 2 has surpassed wireless transmission distance; Surpassed wireless transmission distance if calculate the distance of finding between them, this connection management module M1 determines that Radio Link L1 is in off state, otherwise determines that Radio Link L1 is in the state that is used and collide by a plurality of data contentions.Perhaps, for example, this connection management module M1 can utilize the HelloMsg mechanism in the AODV agreement that network layer adopts to check whether wireless terminal 1 can communicate with wireless terminal 2; If inspection discovery wireless terminal 1 fails to communicate with wireless terminal 2, this connection management module determines that Radio Link L1 is in off state, otherwise determines that Radio Link L1 is in the state that is used and collide by a plurality of data contentions.Except above-mentioned two kinds of methods, can also determine with other method the state of Radio Link L1.After the state of judging Radio Link L1, when also having other wireless terminal, for example wireless terminal 6, during via Radio Link L1 the transmission of data, the connection management module of wireless terminal 1 increases a data miss-reason field in the erroneous packets RERR of AODV agreement, and the state information of filling in the Radio Link L1 that judges in this loss of data cause field, then the network layer of wireless terminal 1 sends to this other wireless terminal (for example wireless terminal 6) via adjacent wireless terminal with this erroneous packets RERR.
In the second approach, when the wireless terminal 2 on Radio Link L1 to its adjacent wireless terminal, when being destination terminal 10 transmission data failure, the network layer of wireless terminal 2 will receive that the data from data link layer send failure notification, these data send failure notification and show that at this moment the connection management module M1 of wireless terminal 2 utilizes above-mentioned two kinds of methods or other method to determine the state information of Radio Link L1 according to this data transmission failure notification to wireless terminal 10 transmission data failures.Then, when wireless terminal 2 is found wireless terminal 1 by Radio Link L1 the transmission of data, the connection management module of wireless terminal 2 increases a data miss-reason field in the erroneous packets RERR of AODV agreement, and fill in the state of the Radio Link L1 that determines in this loss of data cause field, then, the network layer of wireless terminal 2 sends to wireless terminal 1 with this erroneous packets RERR.When the network layer of wireless terminal 1 is received from the erroneous packets RERR of adjacent wireless terminal 2, find to include in this erroneous packets RERR that receives the state information of Radio Link L1, so the connection management module M1 of wireless terminal 1 obtains the state information of Radio Link L1 from the erroneous packets RERR that this is received.
The connection management module M1 of wireless terminal 1 arranges according to the state information of the Radio Link L1 that obtains the pattern (step S40) that TCP connects CON1.
Fig. 4 A-4C is the detail flowchart that the state information according to Radio Link of first embodiment of the invention arranges the pattern of TCP connection.
As shown in Fig. 4 A-4C, at first, the connection management module M1 of wireless terminal 1 determines the state (step S400) of Radio Link L1 according to the state information of the Radio Link L1 that obtains.When the state information of this Radio Link L1 that obtains showed that Radio Link L1 is in off state, the connection management module M1 of wireless terminal 1 checked that TCP connects the present mode (step S401) of CON1.If it is the Radio Link pattern that opens circuit that TCP connects the present mode of CON1, the connection management module M1 of wireless terminal 1 pattern that TCP is connected CON1 continues to remain the Radio Link pattern (step S402) that opens circuit.if it is normal mode that TCP connects the present mode of CON1, Radio Link competition crash mode or interference packet loss pattern, the connection management module M1 TCP of wireless terminal 1 pattern that connects CON1 is set to the Radio Link pattern (step S404) that opens circuit, then, the connection management module M1 of wireless terminal 1 stops all operations of TCP connection CON1 and preserves its state (comprising each timer, the send window size, congestion window size and loop link time (RTT) value etc.) (step S406), then, the connection management module M1 of wireless terminal 1 makes the network layer search be in the Radio Link of channel status between wireless terminal 1 and wireless terminal 10, start simultaneously timing (step S408) is carried out in this search.If search the Radio Link that is in channel status before timing is complete, for example via the Radio Link L2 of wireless terminal 3, the connection management module M1 of wireless terminal 1 connects CON1 with TCP and transfers to Radio Link L2 (step S410), then, TCP is connected CON1 revert to the state (step S412) of preserving before, and the notification transmission layer connects via TCP the data (step S414) that CON1 retransmits last transmission.If still fail to search the Radio Link that is in channel status after timing is complete, the connection management module M1 of wireless terminal 1 makes transport layer close TCP connection CON1 (step S416).
When the state information of this Radio Link L1 that obtains showed that Radio Link L1 is in by a plurality of data contentions uses and collision status, the connection management module M1 of wireless terminal 1 checked that TCP connects the present mode (step S450) of CON1.If it is the Radio Link pattern that opens circuit that TCP connects the present mode of CON1, the connection management module M1 of wireless terminal 1 pattern that TCP is connected CON1 continues to remain the Radio Link pattern (step S452) that opens circuit.If TCP connects the present mode of CON1 to be normal mode, Radio Link competition crash mode or to disturb the packet loss pattern, the connection management module M1 TCP of wireless terminal 1 pattern that connects CON1 is set to Radio Link competition crash mode (step S454).
When the transport layer of wireless terminal 1 was received the transmission object information of described predetermined quantity data, the connection management module M1 of wireless terminal 1 is connected CON1 according to this transmission object information with TCP pattern was determined the transmission (step S50) of subsequent data.
Fig. 5 A-5C be first embodiment of the invention according to the detail flowchart that sends pattern that object information is connected with TCP and determine the subsequent data transmission.
As shown in Fig. 5 A-5C, at first, the connection management module M1 of wireless terminal 1 determines the type (step S500) of this transmission object information.
When this sent object information for 3 ACK message of repetition, the connection management module M1 of wireless terminal 1 checked that TCP connects the present mode (step S501) of CON1.If it is Radio Link competition crash mode that TCP connects the present mode of CON1, the connection management module M1 TCP of wireless terminal 1 pattern that connects CON1 is set to normal mode (step S502), and make transport layer start congestion avoidance mechanism, namely adjust congestion window size and/or send window size, and connect CON1 repeating transmission described predetermined quantity data (step S504) according to the congestion window size after adjusting and/or send window size via TCP.If it is that open circuit pattern and network layer of Radio Link searched for new Radio Link for TCP connects CON1 that TCP connects the present mode of CON1, the connection management module M1 of wireless terminal 1 connects with TCP state and its pattern that CON1 preserves before reverting to and is set to disturb packet loss pattern (step S506), network layer is stopped as TCP connects the new Radio Link (step S508) of CON1 search, and make transport layer connect CON1 repeating transmission described predetermined quantity data (step S510) via TCP.If it is normal mode that TCP connects the present mode of CON1, the connection management module M1 TCP of wireless terminal 1 pattern that connects CON1 is set to disturb packet loss pattern (step S512), and makes transport layer connect CON1 via TCP to retransmit described predetermined quantity data (step S514).If TCP connects the present mode of CON1 for disturbing the packet loss pattern, the connection management module M1 of wireless terminal 1 remains interference packet loss pattern (step S516) with the pattern that TCP connects CON1, and makes transport layer connect CON1 repeating transmission described predetermined quantity data (step S518) via TCP.
When this transmission object information was ACK wait timeout message, the connection management module M1 of wireless terminal 1 checked that TCP connects the present mode (step S540) of CON1.If it is Radio Link competition crash mode that TCP connects the present mode of CON1, the connection management module M1 TCP of wireless terminal 1 pattern that connects CON1 is set to normal mode (step S542), and make transport layer start congestion avoidance mechanism, namely adjust congestion window size and/or send window size, and connect CON1 repeating transmission described predetermined quantity data (step S544) according to the congestion window size after adjusting and/or send window size via TCP.If it is normal mode that TCP connects the present mode of CON1, the connection management module M1 TCP of wireless terminal 1 pattern that connects CON1 is set to disturb packet loss pattern (step S546), and makes transport layer connect CON1 via TCP to retransmit described predetermined quantity data (step S548).If TCP connects the present mode of CON1 for disturbing the packet loss pattern, the connection management module M1 of wireless terminal 1 remains interference packet loss pattern (step S550) with the pattern that TCP connects CON1, and makes transport layer connect CON1 repeating transmission described predetermined quantity data (step S552) via TCP.If it is the Radio Link pattern that opens circuit that TCP connects the present mode of CON1, the connection management module M1 of wireless terminal 1 does not carry out any operation (step S554).
When this transmission object information is correct ACK message, the transport layer that makes the connection management module M1 of wireless terminal 1 continues to send follow-up data (step S556), and the present mode that connects CON1 as TCP is that when disturbing the packet loss pattern, the pattern that TCP connects CON1 is set to normal mode (step S558).
The above has described the transfer control method of first embodiment of the invention by reference to the accompanying drawings.
(the second embodiment)
The second embodiment is similar to the first embodiment, therefore, will omit identical part in these two embodiment in following explanation.
In the second embodiment of the present invention, wireless terminal 1 safeguards that also TCP connects the sending times N of CON1, and determines the transmission of subsequent data according to sending times N.
Fig. 6 be second embodiment of the invention determine according to sending times N the flow chart that subsequent data sends.
As shown in Figure 6, at first, when setting up TCP connection CON1, the connection management module M1 of wireless terminal 1 arranges one and is used for the sending times variable N (step S600) that TCP connects CON1.Then, receive when connecting the ACK wait timeout message of CON1 or repeating 3 ACK message (step S602) about TCP when the connection management module M1 of wireless terminal 1 detects transport layer, the connection management module M1 of wireless terminal 1 judge whether the present mode that TCP connects CON1 is interference packet loss pattern (step S604).If the determination result is NO, the connection management module M1 of wireless terminal 1 makes sending times variable N zero clearing (step S606) when sending times variable N is non-vanishing.If judgment result is that to be, the connection management module M1 of wireless terminal 1 increases by 1 (step S608) with sending times variable N.Then, the connection management module M1 of wireless terminal 1 judges whether sending times variable N has reached predetermined sending times limit value (this predetermined sending times limit value can dynamically be adjusted, and also can be set to constant) (step S610).If the determination result is NO, the connection management module M1 of wireless terminal 1 keeps TCP to connect the present mode constant (step S612) of CON1, and makes transport layer connect the last data (step S614) that send of CON1 repeating transmission via TCP.If judgment result is that be, the connection management module M1 TCP of wireless terminal 1 pattern that connects CON1 is set to normal mode (step S616), start congestion avoidance mechanism, namely adjust congestion window size and/or send window size, and make sending times variable N zero clearing (step S618), then make transport layer connect CON1 via TCP and retransmit the last data (step S620) that send.
(the 3rd embodiment)
The 3rd embodiment is similar to the first embodiment, therefore, will omit identical part in these two embodiment in following explanation.
In the 3rd embodiment, wireless terminal 1 safeguards that also TCP connects the route search number of times M of CON1, and manages TCP connection CON1 according to route search number of times M.
Fig. 7 be third embodiment of the invention manage according to the route search number of times flow chart that TCP connects.
As shown in Figure 7, at first, when setting up TCP connection CON1, the connection management module M1 of wireless terminal 1 arranges one and is used for the route search time number variable M (step S700) that TCP connects CON1.Then, when the connection management module M1 of wireless terminal 1 detected the complete network layer of timing and do not search yet the Radio Link (step S702) that is in channel status, the connection management module M1 of wireless terminal 1 judged that whether present mode that TCP connects CON1 is the Radio Link pattern (step S704) that opens circuit.If the determination result is NO, the connection management module M1 of wireless terminal 1 makes route search time number variable M zero clearing (step S706) when route search time number variable M is non-vanishing.If judgment result is that to be, the connection management module M1 of wireless terminal 1 increases by 1 (step S708) with searching times variable M.Then, the connection management module M1 of wireless terminal 1 judges whether searching times variable M has reached predetermined searching times limit value (this predetermined searching times limit value can dynamically be adjusted, and also can be set to constant) (step S810).If the determination result is NO, the connection management module M1 of wireless terminal 1 is to search reclocking (step S812), and the Radio Link (step S814) that network layer is searched for again be in channel status.If judgment result is that to be, the connection management module M1 of wireless terminal 1 makes transport layer close TCP connection CON1 (step S816).
(other embodiment)
For the transfer control method of the first embodiment, in the situation that connecting CON1, TCP is in the packet loss pattern of disturbing, when the connection management module M1 of wireless terminal 1 detected transport layer and receives correct ACK message, TCP connected CON1 and is set to normal mode.
Transfer control method for the first embodiment, in the situation that connecting CON1, TCP is in the Radio Link pattern that opens circuit, have data to send or transport layer connects when connecting CON1 and receive new data via TCP when the connection management module M1 of wireless terminal 1 detects the upper strata, TCP connects CON1 and is set to normal mode.
Transfer control method for the first embodiment, when connecting CON1, TCP opens circuit pattern when becoming other pattern from Radio Link, when TCP being connected the state that CON1 preserves before reverting to, the connection management module M1 of wireless terminal 1 makes transport layer adjust size and the RTT value of congestion window.
Transfer control method of the present invention both can be realized with the mode of software, also can realize with the mode of hardware or software and hardware combining.
When transfer control method of the present invention is realized with the mode of software, hardware or software and hardware combining, transmission control unit for wireless terminal of the present invention comprises: set up module for one, it establishes a communications link with described another wireless terminal to the Radio Link of another wireless terminal at described wireless terminal; A sending module, it sends the data of predetermined quantity according to the send window size of setting to described another wireless terminal via described communication connection; One arranges module, and it arranges the pattern of described communication connection according to the state information of described Radio Link; And, a determination module, when receiving the transmission object information of described data, it is according to the pattern of described transmission object information and described communication connection, determines subsequently to send via the data of described communication connection.Wherein, the pattern of described communication connection comprises open circuit pattern, Radio Link competition crash mode and disturb the packet loss pattern of normal mode, Radio Link.
Described transmission control unit further comprises: the described module that arranges, and when described state information showed that described Radio Link is in off state, the pattern of described communication connection was set to the Radio Link pattern that opens circuit; Preserve module for one, when the pattern of described communication connection is set to described Radio Link and opens circuit pattern, preserve the state information of described communication connection; A permissions module, when described state information shows that described Radio Link is in off state, stop described sending module via described communication connection the transmission of data, and open circuit from described Radio Link after pattern becomes described interference packet loss pattern or normal mode when the pattern setting of described communication connection, allow described sending module via described communication connection the transmission of data; And one is recovered module, opens circuit pattern when becoming described normal mode or disturbing the packet loss pattern when the pattern setting of described communication connection from described Radio Link, recovers the state of described communication connection according to the state information of described preservation.
Described transmission control unit further comprises: the described module that arranges, when described transmission object information be described predetermined quantity data repeat ACK message or ACK wait timeout message, and when the pattern of described communication connection was Radio Link competition crash mode, the pattern of described communication connection was set to normal mode; An adjusting module, congestion window size and/or the send window of adjusting described communication connection are big or small; And, described sending module, congestion window size and/or send window size after adjusting according to this are retransmitted the data of described predetermined quantity via described communication connection.
Described transmission control unit further comprises: the described module that arranges, when described transmission object information be described predetermined quantity data repeat ACK message or ACK wait timeout message, and when the pattern of described communication connection was described normal mode or interference packet loss pattern, the pattern of described communication connection was set to described interference packet loss pattern; And described sending module is via the data of the described predetermined quantity of described communication connection repeating transmission.
Although fully described in conjunction with the preferred embodiments the present invention above with reference to accompanying drawing, should be noted that various variation of the present invention and distortion are apparent for the technical staff in this area.
Within these variations and distortion will be understood to scope of the present invention as defined in the claims.
Claims (9)
1. transfer control method of carrying out in a wireless terminal comprises the following steps:
(a) establish a communications link with described another wireless terminal to the Radio Link of another wireless terminal at described wireless terminal;
(b) according to the send window size of setting, send the data of predetermined quantity to described another wireless terminal via described communication connection;
(c) obtain the state information of described Radio Link;
(d) according to the state information of the Radio Link that obtains, the pattern of described communication connection is set; And
(e) when receiving the transmission object information of described data, according to the pattern of described transmission object information and described communication connection, determine subsequently to send via the data of described communication connection,
Wherein, the described step that the pattern of described communication connection is set comprises: (1) is that Radio Link is when opening circuit pattern when described state information shows present mode that described Radio Link is in off state and described communication connection, perhaps used by a plurality of data contentions and the present mode of collision status and described communication connection when opening circuit pattern as Radio Link when described state information shows that described Radio Link is in, the pattern of described communication connection is continued to remain the described Radio Link pattern that opens circuit; (2) be normal mode, Radio Link competition crash mode or when disturbing the packet loss pattern when described state information shows present mode that described Radio Link is in off state and described communication connection, the pattern of described communication connection is set to the described Radio Link pattern that opens circuit; And (3) are in when being described normal mode, described Radio Link competition crash mode or described interference packet loss pattern by the present mode of a plurality of data contention uses and collision status and described communication connection when described state information shows described Radio Link, the pattern of described communication connection is set to described Radio Link competition crash mode
Wherein, the described step of determining that subsequently the data via described communication connection send comprises:
When the pattern that is (1) 3 ACK message of repetition and described communication connection when described transmission object information is described Radio Link competition crash mode, when the pattern that is perhaps ACK wait timeout message and described communication connection when described transmission object information was described Radio Link competition crash mode, the pattern of described communication connection was set to described normal mode and makes transport layer adjust congestion window size and/or send window size and retransmit the data of predetermined quantity via described communication connection according to the congestion window size after adjusting and/or send window size; (2) pattern that is 3 ACK message of described repetition and described communication connection when described transmission object information is described Radio Link when opening circuit pattern, described normal mode or described interference packet loss pattern, and the pattern of described communication connection is set to described interference packet loss pattern and makes described transport layer retransmit the data of predetermined quantity via described communication connection; And, when the pattern that is (3) described ACK wait timeout message and described communication connection when described transmission object information was described normal mode or described interference packet loss pattern, the pattern of described communication connection was set to described interference packet loss pattern and makes described transport layer retransmit the data of predetermined quantity via described communication connection.
2. transfer control method as claimed in claim 1 wherein, further comprises:
When in the situation that described state information shows that present mode that described Radio Link is in off state and described communication connection is the pattern of described normal mode, described Radio Link competition crash mode or the described communication connection of described interference packet loss pattern when being set to described Radio Link and opening circuit pattern, stops all operations of described communication connection and preserves its state.
3. transfer control method as claimed in claim 2 wherein, also comprises:
At all operations that stops described communication connection and after preserving its state, attempt the Radio Link that is in channel status that search arrives described another wireless terminal;
If search the described Radio Link that is in channel status, described communication connection is transferred on the Radio Link of described channel status, described communication connection is reverted to the state of described preservation and notify the transport layer of described wireless terminal to retransmit the last data that send.
4. transfer control method as claimed in claim 3 wherein, also comprises:
When attempting the described Radio Link that is in channel status of search, start the timing to described search,
Wherein, if describedly search the described Radio Link that is in channel status, described communication connection is transferred on the Radio Link of described channel status, described communication connection is reverted to the state of described preservation and notify the step of the last data that send of transport layer repeating transmission of described wireless terminal further to comprise:
If search the described Radio Link that is in channel status before described timing is complete, described communication connection is transferred on the Radio Link of described channel status, described communication connection is reverted to the state of described preservation and notify the transport layer of described wireless terminal to retransmit the last data that send.
5. transfer control method as claimed in claim 4 wherein, also comprises:
A route search time number variable that is used for described communication connection is set;
The present mode that does not search yet the described Radio Link that is in channel status and described communication connection when described timing is complete is described Radio Link when opening circuit pattern, and described route search time number variable is increased by 1;
If described route search time number variable does not reach predetermined limit value and do not search yet the described Radio Link that is in channel status, attempt again that search is described is in the Radio Link of channel status and to described search reclocking; And
When having searched the described Radio Link that is in channel status if described route search time number variable does not reach described predetermined limit value, described communication connection is transferred on the Radio Link of described channel status.
6. transfer control method as claimed in claim 1 wherein, further comprises step:
The positional information of the adjacent wireless terminal of preserving according to described wireless terminal is calculated the distance between described wireless terminal and described adjacent wireless terminal;
Judge that whether the distance of described calculating is greater than wireless transmission distance; And
If the distance of described calculating greater than described wireless transmission distance, determines that described Radio Link is in off state, use and collision status otherwise be in a plurality of data contentions.
7. transfer control method as claimed in claim 1 wherein, further comprises step:
Attempt communicating with adjacent wireless terminal; And
If described communication failure determines that described Radio Link is in off state, otherwise determine that described Radio Link is in a plurality of data contentions and uses and collision status.
8. transfer control method as described in claim 6 or 7 wherein, also comprises step:
The state information of the described Radio Link determined is sent to also wireless terminal by described transmission of radio links data via other adjacent wireless terminal.
9. transfer control method as claimed in claim 1 wherein, also comprises step:
Receive the state information of the described Radio Link that other wireless terminal is determined and send via adjacent wireless terminal.
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| WO2012162968A1 (en) * | 2011-08-30 | 2012-12-06 | 华为技术有限公司 | Method, apparatus and system for controlling data transmission |
| CN104580985B (en) * | 2015-01-30 | 2019-02-19 | 深圳市云之讯网络技术有限公司 | Video code rate adaptive approach and system |
| CN107395522B (en) * | 2017-08-25 | 2018-10-12 | 深圳市华讯方舟空间信息产业科技有限公司 | Loss treating method based on Transmission Control Protocol and computer readable storage medium |
| CN108494888A (en) * | 2018-01-18 | 2018-09-04 | 新开普电子股份有限公司 | Low-consumption wireless self-organized network communication protocol stack |
| CN110572240A (en) * | 2019-08-12 | 2019-12-13 | 武汉大学 | Reliable data communication method under unstable network |
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