CN101902823A - Method for transmitting business frame and system thereof - Google Patents
Method for transmitting business frame and system thereof Download PDFInfo
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- CN101902823A CN101902823A CN 201010236291 CN201010236291A CN101902823A CN 101902823 A CN101902823 A CN 101902823A CN 201010236291 CN201010236291 CN 201010236291 CN 201010236291 A CN201010236291 A CN 201010236291A CN 101902823 A CN101902823 A CN 101902823A
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Abstract
The invention discloses a method for transmitting a business frame and a system thereof. The method comprises the following steps: when a transmitting node monitors idle channels and the channels are still idle after waiting for presetting time and first random time, the transmitting node sends the business frame to an intermediate node and monitors an event that the intermediate node sends the business frame; when the intermediate node receives the business frame and monitors the idle channels and the channels are still idle after waiting for the presetting time and second random time, the intermediate node sends the business frame to a destination node; and after the transmitting node monitors the event that the intermediate node sends the business frame to the destination node, the transmitting node determines the intermediate node receives the business frame. The technical scheme of the invention can reduce resource expenditure during the multi-hop communication, and improve utilization rate of the channels.
Description
Technical field
The present invention relates to wireless communication technology, particularly relate to a kind of method and system that sends traffic frame.
Background technology
At wireless communication field, in order to solve such as the user in the smaller local area network (LAN) of office's local area network (LAN) or this class scope of campus network and the wireless access problem of user terminal, IEEE (Institute of Electrical and Electronics Engineers, IEEE-USA) formulated 802.11 standards, the related business of this standard is mainly the access of data.
Can not clash when communicating by letter in order to ensure each user and user terminal, in 802.11 standards, comprise DCF (Distributed Coordination Function, distributed coordination function) mechanism, DCF mechanism comes from CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance, Carrier Sense Multiple Access/conflict is avoided), again CSMA/CA is expanded, added ACK control grouping and realized affirmation the traffic frame of MAC (medium access control) layer.In addition, in 802.11 standards, also kept the carrier wave testing mechanism among the CSMA/CA.Fig. 1 is the flow chart that node sends traffic frame in the prior art to another node direct-connected with it.As shown in Figure 1, this flow process comprises the steps:
Step 101: sending node detects the state of channel, if channel be idle, then waits for the regular hour, if wait for that to finish the back channel still idle, then random wait regular hour again, enters step 102 after the end of random wait time;
Step 102:, then enter step 103, otherwise return step 101 if channel is still idle;
Step 103: sending node sends RTS (Request to Send sends request) message to destination node;
Step 104: after destination node is received the RTS message, send CTS (Clear to Send can send) message to sending node;
Step 105: after sending node is received the CTS message, send traffic frame to destination node;
Step 106: after destination node is received traffic frame, send acknowledge message to sending node.
General, RTS message and CTS message are shorter, be 16 microseconds as duration, and the length of traffic frame will be much larger than the durations of RTS message and CTS message.In particular cases, when the length of traffic frame more in short-term, for example, when the duration of the duration of traffic frame and RTS message or CTS message is suitable, can skips steps 103 and 104, directly execution in step 105 and 106 after step 101 and 102 is carried out and finished.
This shows, utilize prior art, can guarantee that each user and the user terminal in the network can not clash when the transmission data, so just guaranteed the accuracy of transfer of data.
But, when utilizing prior art to communicate, owing to will after the signaling procedure of shaking hands of transmission RTS message and CTS message, just carry out the transmission of traffic frame between two adjacent nodes, and destination node also needs initiatively to send acknowledge message to sending node after receiving traffic frame, therefore, when prior art is applied to multi-hop communication, will inevitably be too many because of the signaling of shaking hands between sending node and the intermediate node and between intermediate node and the destination node, the affirmation message that the node that receives traffic frame needs initiatively to send causes resource overhead excessive too much, and the utilance of channel is also very low.
Summary of the invention
The invention provides a kind of method that sends traffic frame, this method can reduce the resource overhead in the multi-hop communication process, improves the utilance of channel.
The present invention also provides a kind of system that sends traffic frame, and this system can reduce the resource overhead in the communication process, improves the utilance of channel.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that sends traffic frame, this method comprises:
When sending node listens to channel idle, wait for the scheduled time, if it is still idle that the described scheduled time finishes the described channel in back, then wait for first random time, if it is still idle that described first random time finishes the described channel in back, then sending node sends traffic frame to intermediate node, and intercepts the incident that intermediate node sends described traffic frame;
After intermediate node is received described traffic frame, when listening to channel idle, wait for the described scheduled time, if it is still idle that the described scheduled time finishes the described channel in back, then wait for second random time, if it is still idle that described second random time finishes the described channel in back, then intermediate node sends described traffic frame to destination node;
Sending node listens to after intermediate node sends the incident of described traffic frame to destination node, confirms that intermediate node received described traffic frame.
After destination node sent described traffic frame, this method further comprised at intermediate node: after destination node receives described traffic frame, will self receive the message informing intermediate node of described traffic frame.
Sending node is after intermediate node sends traffic frame, this method further comprises: if sending node does not listen to intermediate node yet and sends the incident of described traffic frame to destination node when re-transmission period finishes, then sending node sends described traffic frame to intermediate node again.
Described sending node sends traffic frame to intermediate node, comprising:
Sending node is transferred to described traffic frame the physical layer of self from self media access control MAC layer;
The physical layer of sending node is handled described traffic frame, and transmitting of obtaining comprises lead code, signaling moiety and data division, and wherein, described signaling moiety is used to preserve the length and the signaling of described data division; Described lead code is a random access lead code, is used for input and synchronously thick, and first multiple of the time span that its time length is described signaling moiety doubly; Described data division is used for preserving the data of described traffic frame, and second multiple of the time span that its time length is described signaling moiety doubly;
The physical layer of sending node sends described transmitting to intermediate node.
Described signaling moiety comprises a multiplexing SC-FDMA symbol of single carrier frequency division;
And/or,
The time span of described signaling moiety is 137/1920000 second;
And/or,
Described first multiple is 2 nonnegative integer time power;
And/or,
Described second multiple is the integer greater than 0.
A kind of system that sends traffic frame, this system comprises sending node, intermediate node and destination node, wherein:
Sending node, be used for when listening to channel idle, wait for the scheduled time, if it is still idle that the described scheduled time finishes the described channel in back, then wait for first random time, if it is still idle that described first random time finishes the described channel in back, then send traffic frame, and intercept the incident that intermediate node sends described traffic frame to intermediate node; Listen to after intermediate node sends the incident of described traffic frame to destination node, confirm that intermediate node received described traffic frame;
Intermediate node, be used for after receiving described traffic frame, when listening to channel idle, wait for the described scheduled time, if it is still idle that the described scheduled time finishes the described channel in back, then wait for second random time, still idle if described second random time finishes the described channel in back, then send described traffic frame to destination node;
Destination node is used to receive described traffic frame.
Described destination node is further used for, and after receiving described traffic frame, will self receive the message informing intermediate node of described traffic frame.
Described sending node is further used for, and after sending traffic frame to intermediate node, does not send the incident of described traffic frame if re-transmission period self listens to intermediate node yet when finishing to destination node, then sends described traffic frame to intermediate node again.
Described sending node comprises MAC layer and physical layer,
The MAC layer of sending node is used for, with the physical layer of described traffic frame from the self transmission to the sending node;
The physical layer of sending node is used for, and described traffic frame is handled, and transmitting of obtaining comprises lead code, signaling moiety and data division, and wherein, described signaling moiety is used to preserve the length and the signaling of described data division; Described lead code is a random access lead code, is used for input and synchronously thick, and first multiple of the time span that its time length is described signaling moiety doubly; Described data division is used for preserving the data of described traffic frame, and second multiple of the time span that its time length is described signaling moiety doubly; Send described transmitting to intermediate node.
Described signaling moiety comprises a SC-FDMA symbol;
And/or,
The time span of described signaling moiety is 137/1920000 second;
And/or,
Described first multiple is 2 nonnegative integer time power;
And/or,
Described second multiple is the integer greater than 0.
This shows, among the present invention, since sending node and intermediate node listen to channel idle and waited for the scheduled time and random time after under the still idle situation of channel, directly send traffic frame, need not as prior art, just to send traffic frame through the signaling procedure of shaking hands, confirm that by intercepting mode intermediate node received traffic frame by sending node, need not to carry out active by intermediate node as prior art confirms, therefore, utilize technical scheme of the present invention, can reduce the resource overhead in the communication process, improve the utilance of channel.
Description of drawings
Fig. 1 is the flow chart that node sends traffic frame in the prior art to another node direct-connected with it;
Fig. 2 is the method flow diagram of transmission traffic frame provided by the invention;
Fig. 3 is the format chart that transmits of physical layer in the prior art;
Fig. 4 is the format chart that transmits of the physical layer among the present invention;
Fig. 5 is for sending the flow chart of a specific embodiment of Frame among the present invention;
Fig. 6 is for sending the flow chart of a specific embodiment of Speech frame among the present invention;
Fig. 7 is the system diagram of the transmission traffic frame among the present invention.
Embodiment
Core concept of the present invention is: sending node is listening to channel idle, and wait for that channel is still idle, then without the signaling procedure of shaking hands after the scheduled time and the one section random time, directly send traffic frame, and intercept the incident that intermediate node sends traffic frame to intermediate node; After intermediate node is received traffic frame, listening to channel idle, and waiting for after the scheduled time and another section random time, channel is still idle, then without the signaling procedure of shaking hands, directly sends traffic frame to destination node; The message that sending node sends traffic frame to destination node with the intermediate node that listens to as intermediate node to receiving the affirmation of traffic frame.
This shows, among the present invention, since sending node and intermediate node listen to channel idle and waited for the scheduled time and random time after under the still idle situation of channel, directly send traffic frame, need not as prior art, just to send traffic frame through the signaling procedure of shaking hands, confirm that by intercepting mode intermediate node received traffic frame by sending node, need not to carry out active by intermediate node as prior art confirms, therefore, utilize technical scheme of the present invention, can reduce the resource overhead in the communication process, improve the utilance of channel.
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Fig. 2 is the method flow diagram of transmission traffic frame provided by the invention.As shown in Figure 2, this method comprises:
Step 201: when sending node listens to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for first random time, if it is still idle that first random time finishes the back channel, then sending node sends traffic frame to intermediate node, and intercepts the incident that intermediate node sends traffic frame.
Here, the length of the scheduled time that sending node is waited for is defined by network, is certain value.
The length of first random time is determined at random that by sending node like this, because the time span that the institute of each node in the network determines at random is inequality, therefore, the present invention can reduce the chance of generation communication contention aware between node.
Step 202: after intermediate node is received traffic frame, when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for second random time, still idle if second random time finishes the back channel, then intermediate node sends traffic frame to destination node.
Here, the length of second random time is determined at random by intermediate node, so also helps reducing the chance that communication contention aware takes place between node.
Step 203: sending node listens to intermediate node after the incident of destination node transmission traffic frame, confirms that intermediate node is to receiving this traffic frame.
Here, the present invention does not need as prior art, initiatively send the affirmation message of self having received traffic frame by intermediate node to sending node, and in step 201, initiatively intercept the incident that intermediate node sends traffic frame by sending node, if sending node listens to intermediate node and has sent this traffic frame, illustrate that then intermediate node received this traffic frame, sending node confirms that at this point intermediate node received this traffic frame.
In method shown in Figure 2, only related to an intermediate node, the present invention can also be used for intermediate node more than one situation.With intermediate node two situation being arranged below is example, and the method for transmission traffic frame provided by the invention is described, intermediate node more than two situation by that analogy.When intermediate node had two, the method for transmission traffic frame provided by the invention may further comprise the steps:
Sending node is when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for first random time, if it is still idle that first random time finishes the back channel, then sending node sends traffic frame to first intermediate node, and intercepts the incident that first intermediate node sends traffic frame;
After first intermediate node is received traffic frame, when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for second random time, if it is still idle that second random time finishes the back channel, then first intermediate node sends traffic frame to second intermediate node, and intercepts second intermediate node sends incident from traffic frame to destination node;
Sending node listens to after first intermediate node sends the incident of traffic frame to second intermediate node, confirms that first intermediate node received this traffic frame;
After second intermediate node is received traffic frame, when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for the 3rd random time, still idle if the 3rd random time finishes the back channel, then second intermediate node sends traffic frame to destination node;
First intermediate node listens to after second intermediate node sends the incident of traffic frame to destination node, confirms that second intermediate node received this traffic frame.
In step 202, when intermediate node after destination node sends traffic frame, this method further comprises: after destination node receives traffic frame, will self receive the message informing intermediate node of traffic frame.
Here, after destination node is received traffic frame, can initiatively send the affirmation message that receive traffic frame to intermediate node, like this, intermediate node just can confirm that destination node received this traffic frame, thus assurance traffic frame safety of transmission.
In step 201, sending node is after intermediate node sends traffic frame, this method further comprises: if sending node does not listen to intermediate node yet and sends the incident of traffic frame to destination node when re-transmission period finishes, then sending node sends this traffic frame to intermediate node again.
Here, the time span of re-transmission period is defined by network.After sending traffic frame, sending node picks up counting, if re-transmission period finishes, be the time span of timing when surpassing re-transmission period sending node do not listen to intermediate node sends incident from traffic frame to destination node yet, then sending node thinks that intermediate node do not receive this traffic frame, so just sends this traffic frame to intermediate node again.
Equally, among the present invention, intermediate node also can pick up counting after next intermediate node or destination node transmission traffic frame, do not transmit the message of traffic frame or the incident that destination node is received traffic frame if receive next intermediate node when timing time length exceeds re-transmission period yet, then resend this traffic frame, till receiving acknowledge message.
This overtime method that then retransmits traffic frame of the present invention can guarantee the traffic frame safety of transmission.
Each node comprises MAC (medium access control) layer and physical layer.Fig. 3 is the format chart that transmits of physical layer in the prior art.As shown in Figure 3, in the prior art, the physical layer traffic frame that transmission comes to the MAC layer is encoded, after encapsulation etc. are handled, transmitting of obtaining comprises synchronous code, signaling code and data division, wherein, synchronous code is positioned at the forefront of signal, time span is 16 microseconds, be used for the detection of signal, frequency and time synchronously, synchronous code is made up of short sequence and long sequence two parts again, the time slot that short sequence is 0.8 microsecond by 10 time spans is formed, be used for thick frequency offset estimating and frame synchronization, long sequence is by the time slot T1 of 2 3.2 microseconds, the protection of T2 and 1.6 microseconds GI2 is at interval formed, and is used for smart frequency offset estimating and OFDM (Orthogonal Frequency Division Multiplexing, OFDM) sign synchronization; Signaling code is an OFDM symbol, comprises the protection interval GI of 0.8 microsecond and the signaling of 3.2 microseconds, and its time length is 4 microseconds; Data division comprises a plurality of OFDM symbols, and each OFDM symbol comprises the protection interval GI of 0.8 microsecond and the data of 3.2 microseconds.
In the prior art, the lead code duration that transmits that the physical layer of each node obtains is 16 microseconds, so short lead code is when being used for the detection of signal, frequency and time synchronous, can be subjected to the restriction of wireless environment, only be applicable to the situation that short distance and wireless environment are good, for example in indoor environment, and can't be applied to outdoor the grade in the more serious wireless environment of multidiameter delay.
The present invention has solved this problem by redefining the form that transmits that each node physical layer obtains, and makes the present invention can be applied to more serious outdoor the grade in the wireless environment of multidiameter delay.Physical layer with sending node is an example, the physical layer of other nodes and the like, specific implementation is as follows:
Sending node sends traffic frame to intermediate node in the step 201, may further comprise the steps:
Sending node is transferred to traffic frame the physical layer of self from self MAC layer;
The physical layer of sending node is handled traffic frame, is transmitted.Fig. 4 is the format chart that transmits of the physical layer among the present invention.As shown in Figure 4, physical layer is handled resulting the transmitting in back to traffic frame and is comprised lead code, signaling moiety and data division, and wherein, signaling moiety is used to preserve the length and the signaling of data division; Lead code is a random access lead code, is used for input and synchronously thick, and first multiple of the time span that its time length is signaling moiety doubly; Data division is used for preserving the data of traffic frame, and second multiple of the time span that its time length is signaling moiety doubly;
The physical layer of sending node transmits to intermediate node.
Here, signaling moiety comprises a SC-FDMA (single carrier frequency division is multiplexing) symbol, and this symbol time length is 2192 sampling periods, each sampling period is Ts=1/30720000 second, is about 0.03 microsecond, therefore, the time span of signaling moiety is 137/1920000 second, is about 71 microseconds;
First multiple is 2 nonnegative integer time power, such as, can be 1,2,4,8,16,32,64,128 etc., first multiple select difference for use with the difference of network wireless environment of living in, wireless environment is good more, first multiple of then selecting for use is just more little, and wireless environment is poor more, and first multiple of then selecting for use is big more;
Data division comprises second multiple SC-FDMA symbol, wherein, second multiple is the integer greater than 0, such as, can be integers such as 1,2,3, the size of second multiple is relevant with the data volume in the traffic frame, and the traffic frame data quantity transmitted of wanting is big more, then second multiple is also just big more, and the time span of data division is also just long more in transmitting.
This shows, the present invention has redefined the form that transmits that physical layer obtains, when first multiple is 16, the time span of its lead code is about 1142 microseconds, duration is the synchronous code of 16 microseconds in the prior art, and the time difference of personal attendant wireless environment and variable of the lead code among the present invention, this makes the present invention can resist the interference of the various complex wireless environments in indoor and outdoor effectively, guarantee transfer of data accurately.
Traffic frame recited above can be Frame, also can be Speech frame.
Fig. 5 is for sending the flow chart of a specific embodiment of Frame among the present invention.As shown in Figure 5, comprise A, B, four nodes of C, D in this network, wherein, A is a sending node, and D is a destination node, and B and C are respectively first intermediate node and second intermediate node, and then Frame is as follows from the process that A sends to D:
When A listens to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for first random time, if it is still idle that first random time finishes the back channel, then A sends Frame to B, picks up counting and intercepts the incident that B sends this Frame, do not listen to B transmission Frame yet if timing time exceeds re-transmission period, then A resends this Frame to B;
After B receives Frame, when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for second random time, still idle if second random time finishes the back channel, then B sends this Frame to C, pick up counting and intercept the incident that C sends this Frame, do not listen to C yet and send Frame if timing time exceeds re-transmission period, then B resends this Frame to C;
A listens to B after the incident of C transmission Frame, confirms that B has received this Frame;
After C receives Frame, when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for the 3rd random time, still idle if the 3rd random time finishes the back channel, then C sends this Frame to D, pick up counting, if timing time exceeds the affirmation message of receiving this Frame that re-transmission period does not receive that yet D sends, then C resends this Frame to D;
B listens to C after the incident of D transmission Frame, confirms that C has received this Frame;
After D receives Frame, send the affirmation message of having received this Frame to C.
Fig. 6 is for sending the flow chart of a specific embodiment of Speech frame among the present invention.As shown in Figure 6, comprise A, B, four nodes of C, D in this network, wherein, A is a sending node, and D is a destination node, and B and C are respectively first intermediate node and second intermediate node, and then Speech frame is as follows from the process that A sends to D:
When A listens to channel idle, wait for the scheduled time, still idle if the scheduled time finishes the back channel, then wait for first random time, still idle if first random time finishes the back channel, then A sends Speech frame to B, and intercepts the incident that B sends this Speech frame;
After B receives Speech frame, when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for second random time, still idle if second random time finishes the back channel, then B sends this Speech frame to C, and intercepts the incident that C sends this Speech frame;
A listens to B after the incident of C transmission Speech frame, confirms that B has received this Speech frame;
After C receives Speech frame, when listening to channel idle, wait for the scheduled time, still idle if the scheduled time finishes the back channel, then wait for the 3rd random time, still idle if the 3rd random time finishes the back channel, then C sends this Speech frame to D;
B listens to C after the incident of D transmission Speech frame, confirms that C has received this Speech frame.
The invention allows for a kind of system that sends traffic frame, Fig. 7 is the system diagram of the transmission traffic frame among the present invention.As shown in Figure 7, this system comprises sending node 701, intermediate node 702 and destination node 703, wherein:
Sending node 701, be used for when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for first random time, if it is still idle that first random time finishes the back channel, then send traffic frame, and intercept the incident that intermediate node 702 sends traffic frame to intermediate node 702; Listen to intermediate node 702 after destination node 703 sends the incident of traffic frame, affirmation intermediate node 702 has been received this traffic frame;
Here, intermediate node 702 can comprise one or more node, for example, comprises two nodes, promptly is divided into first intermediate node and second intermediate node, then,
Sending node 701, be used for when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for first random time, if it is still idle that first random time finishes the back channel, then send traffic frame, and intercept the incident that first intermediate node sends traffic frame to first intermediate node; Listen to after first intermediate node sends the incident of traffic frame to second intermediate node, confirm that first intermediate node received this traffic frame;
First intermediate node, be used for after receiving traffic frame, when listening to channel idle, wait for the scheduled time, if it is still idle that the scheduled time finishes the back channel, then wait for second random time, still idle if second random time finishes the back channel, then send traffic frame, and intercept the incident that second intermediate node sends traffic frame to second intermediate node; Listen to after second intermediate node sends the incident of traffic frames to destination node 703, confirm that second intermediate node received this traffic frame;
Second intermediate node is used for after receiving traffic frame, when listening to channel idle, wait for the scheduled time, still idle if the scheduled time finishes the back channel, then wait for the 3rd random time, if it is still idle that the 3rd random time finishes the back channel, then send traffic frame to destination node 703;
Among the present invention, destination node 703 is further used for, and after receiving traffic frame, will self receive the message informing intermediate node 702 of traffic frame.
In addition, sending node 701 is further used for, after sending traffic frame,, then send these traffic frames to intermediate node 702 again if re-transmission period self does not listen to the incident of intermediate node 702 to destination node 703 transmission traffic frames yet when finishing to intermediate node 702.
Sending node 701 comprises MAC layer and physical layer, wherein,
The MAC layer of sending node 701 is used for, with traffic frame physical layer of 701 from the self transmission to the sending node;
The physical layer of sending node 701 is used for, and traffic frame is handled, and transmitting of obtaining comprises lead code, signaling moiety and data division, and wherein, signaling moiety is used to preserve the length and the signaling of data division; Lead code is a random access lead code, is used for input and synchronously thick, and first multiple of the time span that its time length is signaling moiety doubly; Data division is used for preserving the data of traffic frame, and second multiple of the time span that its time length is signaling moiety doubly; Transmit to intermediate node 702.
Wherein, signaling moiety comprises a SC-FDMA symbol, and the time span of this symbol is 2192 sampling periods, each sampling period is Ts=1/30720000 second, is about 0.03 microsecond, therefore, the time span of signaling moiety is 137/1920000 second, is about 71 microseconds;
First multiple is 2 nonnegative integer time power, such as, can be 1,2,4,8,16,32,64,128 etc., first multiple select difference for use with the difference of network wireless environment of living in, wireless environment is good more, first multiple of then selecting for use is just more little, and wireless environment is poor more, and first multiple of then selecting for use is big more;
Data division comprises second multiple SC-FDMA symbol, wherein, second multiple is the integer greater than 0, such as, can be integers such as 1,2,3, the size of second multiple is relevant with the data volume in the traffic frame, and the traffic frame data quantity transmitted of wanting is big more, then second multiple is also just big more, and the time span of data division is also just long more in transmitting.
Certainly, in the system of transmission traffic frame provided by the invention, can also comprise a plurality of intermediate nodes or destination node, these nodes also can comprise MAC layer and physical layer, structure that transmits that the physical layer of each node obtains after traffic frame is handled and function can be analogized according to resulting structure that transmits of the physical layer of sending node and function, do not do at this and give unnecessary details.
In the system of transmission traffic frame of the present invention, traffic frame can be Frame, also can be Speech frame.
This shows that the present invention has the following advantages:
(1) among the present invention, since sending node and intermediate node listen to channel idle and waited for the scheduled time and random time after under the still idle situation of channel, directly send traffic frame, need not as prior art, just to send traffic frame through the signaling procedure of shaking hands, confirm that by intercepting mode intermediate node received traffic frame by sending node, need not to carry out active by intermediate node as prior art confirms, therefore, utilize technical scheme of the present invention, can reduce the resource overhead in the communication process, improve the utilance of channel.
(2) among the present invention, destination node can initiatively send the affirmation message that receive traffic frame to intermediate node after receiving traffic frame, and like this, intermediate node just can confirm that destination node received this traffic frame, thus assurance traffic frame safety of transmission.
(3) the overtime technical scheme that then retransmits traffic frame among the present invention can further guarantee the traffic frame safety of transmission.
(4) among the present invention, owing to redefined the form that transmits that each node physical layer obtains, therefore, technical scheme of the present invention can be applied in the more serious wireless environment such as outdoor of multi-hop communication occasion and multidiameter delay.
(5) the present invention had both supported the voice service that real-time is had relatively high expectations, and also supported wrong responsive data service, thereby had wide range of applications.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a method that sends traffic frame is characterized in that, this method comprises:
When sending node listens to channel idle, wait for the scheduled time, if it is still idle that the described scheduled time finishes the described channel in back, then wait for first random time, if it is still idle that described first random time finishes the described channel in back, then sending node sends traffic frame to intermediate node, and intercepts the incident that intermediate node sends described traffic frame;
After intermediate node is received described traffic frame, when listening to channel idle, wait for the described scheduled time, if it is still idle that the described scheduled time finishes the described channel in back, then wait for second random time, if it is still idle that described second random time finishes the described channel in back, then intermediate node sends described traffic frame to destination node;
Sending node listens to after intermediate node sends the incident of described traffic frame to destination node, confirms that intermediate node received described traffic frame.
2. method according to claim 1, it is characterized in that, after destination node sent described traffic frame, this method further comprised at intermediate node: after destination node receives described traffic frame, will self receive the message informing intermediate node of described traffic frame.
3. method according to claim 1 and 2, it is characterized in that, sending node is after intermediate node sends traffic frame, this method further comprises: if sending node does not listen to intermediate node yet and sends the incident of described traffic frame to destination node when re-transmission period finishes, then sending node sends described traffic frame to intermediate node again.
4. method according to claim 1 and 2 is characterized in that, described sending node sends traffic frame to intermediate node, comprising:
Sending node is transferred to described traffic frame the physical layer of self from self media access control MAC layer;
The physical layer of sending node is handled described traffic frame, and transmitting of obtaining comprises lead code, signaling moiety and data division, and wherein, described signaling moiety is used to preserve the length and the signaling of described data division; Described lead code is a random access lead code, is used for input and synchronously thick, and first multiple of the time span that its time length is described signaling moiety doubly; Described data division is used for preserving the data of described traffic frame, and second multiple of the time span that its time length is described signaling moiety doubly;
The physical layer of sending node sends described transmitting to intermediate node.
5. method according to claim 4 is characterized in that,
Described signaling moiety comprises a multiplexing SC-FDMA symbol of single carrier frequency division;
And/or,
The time span of described signaling moiety is 137/1920000 second;
And/or,
Described first multiple is 2 nonnegative integer time power;
And/or,
Described second multiple is the integer greater than 0.
6. a system that sends traffic frame is characterized in that, this system comprises sending node, intermediate node and destination node, wherein:
Sending node, be used for when listening to channel idle, wait for the scheduled time, if it is still idle that the described scheduled time finishes the described channel in back, then wait for first random time, if it is still idle that described first random time finishes the described channel in back, then send traffic frame, and intercept the incident that intermediate node sends described traffic frame to intermediate node; Listen to after intermediate node sends the incident of described traffic frame to destination node, confirm that intermediate node received described traffic frame;
Intermediate node, be used for after receiving described traffic frame, when listening to channel idle, wait for the described scheduled time, if it is still idle that the described scheduled time finishes the described channel in back, then wait for second random time, still idle if described second random time finishes the described channel in back, then send described traffic frame to destination node;
Destination node is used to receive described traffic frame.
7. system according to claim 6 is characterized in that described destination node is further used for, and after receiving described traffic frame, will self receive the message informing intermediate node of described traffic frame.
8. according to claim 6 or 7 described systems, it is characterized in that, described sending node is further used for, after sending traffic frame to intermediate node, if re-transmission period self does not listen to intermediate node yet and sends the incident of described traffic frame to destination node when finishing, then send described traffic frame to intermediate node again.
9. according to claim 6 or 7 described systems, it is characterized in that described sending node comprises MAC layer and physical layer,
The MAC layer of sending node is used for, with the physical layer of described traffic frame from the self transmission to the sending node;
The physical layer of sending node is used for, and described traffic frame is handled, and transmitting of obtaining comprises lead code, signaling moiety and data division, and wherein, described signaling moiety is used to preserve the length and the signaling of described data division; Described lead code is a random access lead code, is used for input and synchronously thick, and first multiple of the time span that its time length is described signaling moiety doubly; Described data division is used for preserving the data of described traffic frame, and second multiple of the time span that its time length is described signaling moiety doubly; Send described transmitting to intermediate node.
10. system according to claim 9 is characterized in that,
Described signaling moiety comprises a SC-FDMA symbol;
And/or,
The time span of described signaling moiety is 137/1920000 second;
And/or,
Described first multiple is 2 nonnegative integer time power;
And/or,
Described second multiple is the integer greater than 0.
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| CN 201010236291 CN101902823A (en) | 2010-07-26 | 2010-07-26 | Method for transmitting business frame and system thereof |
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