CN103237323A - Multichannel-based parallel node accepting method - Google Patents
Multichannel-based parallel node accepting method Download PDFInfo
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- CN103237323A CN103237323A CN2013101652578A CN201310165257A CN103237323A CN 103237323 A CN103237323 A CN 103237323A CN 2013101652578 A CN2013101652578 A CN 2013101652578A CN 201310165257 A CN201310165257 A CN 201310165257A CN 103237323 A CN103237323 A CN 103237323A
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Abstract
The invention discloses a multichannel-based parallel node accepting method and mainly aims to solve the problem that the accepting efficiency of a traditional node accepting method is not high. The multichannel-based parallel node accepting method comprises the following implementation steps of allocating channel resources, and dividing accepting cycles; planning time slots with different uses in every accepting cycle; forming bidirectional signaling channels by utilizing downlink and uplink explorer frame time slots; completing downlink power control and downlink channel training by utilizing downlink explorer frames; selecting an idle bidirectional signaling channel by slave nodes, and sending uplink explorer frames; sending the downlink explorer frames by a central node according to the received uplink explorer frames; receiving downlink explorer frames by the slave nodes, and inquiring the state of the selected bidirectional signaling channel; and completing a node accepting process according to the inquired state. The multichannel-based parallel node accepting method disclosed by the invention has the advantages that the accepting time is short, the slave nodes cannot be easily conflict when the number of the slave nodes is large, and the accepting efficiency is high. The multichannel-based parallel node accepting method can be applied to the field of various local area networks and local area networks adopting time division multiplexing/ time division multiple access mechanism allocated channels.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of node acceptance method, can be applicable to local area network (LAN) and the Access Network field of various employing time division multiplexinges/time division multiple access mechanism allocated channel.
Background technology
In based on the local area network (LAN) and Access Network of sharing medium, often adopt one the point at center to be arranged to the logical topology structure of multiple spot.In this network configuration, there are a Centroid and a plurality of slave node, other node except Centroid is called slave node.Can directly carry out data communication between Centroid and the slave node, the communication between each slave node generally need be transmitted by Centroid.A new slave node power-up initializing or reset after, be called node to Centroid registration and the process that joins existing system and admit.Usually, node just can carry out normal data communication after admitting and finishing.Admit for finishing node, Centroid and slave node need repeatedly interactive information usually.In this process, channel is divided into continuously and the admittance cycle of non-overlapping copies in time; Each admittance cycle is contained descending explore frame time slot and uplink detection frame slot; Descending explore frame time slot is used for Centroid and generates and sends descending explore frame, and the uplink detection frame slot is used for slave node and generates and sends the uplink detection frame.Up/descending explore frame is mainly finished the channel training of physical layer, and carrying Centroid and slave node mutual MAC layer in node admittance process up/the downlink signaling frame.The zero-time of adjacent two descending explore frames is spaced apart an admittance cycle.
In already present network system, adopt based on single pass man-to-man acceptance method usually.In this method, each admittance cycle is only contained a descending explore frame time slot and a uplink detection frame slot, is respectively applied to Centroid and sends a descending explore frame and uplink detection frame of slave node transmission; A up/descending explore frame is used for carrying out the channel training of physical layer and carries the row/descending MAC layer signaling frame on the way that node is admitted process respectively; Centroid carries out with serial mode the admittance of each slave node, just can carry out the admittance of next slave node after namely having only slave node to admit to finish.
Above-mentioned node acceptance method is present based on widely used method in the local area network (LAN) of sharing medium and the Access Network, but it is long to exist the slave node time of admittance for a long time, the shortcoming of admitting request easily to clash.
In local area network (LAN) and Access Network, usually slave node is more, and Centroid need be finished the admittance process to a plurality of slave nodes.And in based on single pass man-to-man acceptance method, a up/descending explore frame carrying of transmitting in a up/descending explore frame time slot is row/downlink signaling frame on the way.A Centroid can only carry out the admittance process of a slave node simultaneously, when a plurality of slave nodes need to be received in the network simultaneously, need the wait long period just can finish whole admittance process, especially cause under the situation that each slave node powers on simultaneously restoring electricity after the power failure, Centroid is finished the admittance process need long time of all slave nodes; And after current slave node is finished the admittance process; slave nodes to be accepted such as a large amount of can be competed the cashier machine meeting usually at unique uplink detection frame slot; send the request of admitting simultaneously; thereby clash; caused time waste; the slave node that clashes can only after the admittance cycle in the uplink detection frame slot send the request of admitting again, therefore further prolonged the admittance time.
Summary of the invention
The objective of the invention is to the deficiency at above-mentioned prior art, proposed a kind ofly based on multichannel parallel node acceptance method, to shorten the admittance time, reduce collision probability, improve and admit efficient, save channel resource simultaneously.
For achieving the above object, technical scheme of the present invention comprises the steps:
(1) adopts time division multiplexing/time division multiple access mechanism allocation of channel resources may, to descending employing time division multiplexing, to up employing time division multiple access, channel is divided into continuously and the admittance cycle of non-overlapping copies in time;
(2) in each admittance cycle, adopt fixing planning or Dynamic Programming mode, cook up the time slot of following different purposes:
Be used for several downlink data frame slots that Centroid sends downlink data frame, be used for several upstream data frame slots that slave node sends uplink data frames;
Be used for several descending control frame time slots that Centroid sends descending control frame, be used for several upload control frame slots that slave node sends the upload control frame;
Be used for the descending explore frame time slot that Centroid sends a down physical layer explore frame;
Be used for N the uplink detection frame slot that slave node sends N upstream physical layer explore frame;
(3) a descending explore frame time slot and N uplink detection frame slot that utilizes step (2) planning to obtain constitutes N two-way signalling path:
(3a) utilize a down physical layer explore frame that sends at a descending explore frame time slot, mark off N descending MAC layer signaling frame passage, carrying N road descending MAC floor signaling frame, each passage carries one tunnel descending MAC layer signaling frame, described MAC layer refers to medium access control layer;
(3b) utilize a upstream physical layer explore frame that sends at a uplink detection frame slot, a up MAC layer signaling frame passage is provided, carrying is capable MAC layer signaling frame on the way;
(3c) that N descending MAC layer signaling frame passage is corresponding with N up MAC layer signaling frame passage, constitute N two-way signalling path, i.e. corresponding i the up MAC layer signaling frame passage of the descending MAC layer signaling frame passage of i, constitute i two-way signalling path, have sign in the descending MAC layer signaling frame of each descending MAC layer signaling frame passage carrying, show that the current state of two-way signalling path of its correspondence is in busy or idle;
(4) Centroid continues to send descending explore frame at descending explore frame time slot, slave node continues to receive descending explore frame, and utilize descending explore frame to carry out descending power control and down channel training, after finishing descending power control and down channel and training, enter step (5);
(5) slave node receives descending explore frame, the sign in the descending MAC floor signaling frame of inquiry N road, and the number of the two-way signalling path that statistics is idle is M, if M=0 waits for that is then admitted all after date repeating steps (5); If M〉0, then in this M idle two-way signalling path, select a two-way signalling path at random, send the request of admitting at its corresponding uplink detection frame slot;
(6) Centroid upgrades the sign in the descending MAC floor signaling frame of N road, sends descending explore frame:
If Centroid is not received the uplink detection frame at some uplink detection frame slots, then keep the sign in the descending MAC layer signaling frame of this time slot correspondence constant, at descending explore frame time slot, Centroid sends descending explore frame;
If Centroid has been received the uplink detection frame at some uplink detection frame slots, then the sign in the descending MAC layer signaling frame of this time slot correspondence is set to busyly, at descending explore frame time slot, this two-way signalling path of Centroid utilization sends admits response;
(7) slave node receives descending explore frame, inquires about the sign in the descending MAC layer signaling frame of selected two-way signalling path correspondence:
If be masked as the free time, then conflict has taken place in the admittance request of slave node, and slave node is carried out back off algorithm, waits for several admittances cycle, returns step (5);
If be masked as busy, then the admittance request of slave node sends successfully, this two-way signalling path of slave node and Centroid utilization carries out up channel training or uplink power control, this two-way signalling path broadcast channel parameter of Centroid utilization, at last be set to the free time by the sign of Centroid in will the descending MAC layer signaling frame of this two-way signalling path correspondence, finish the admittance process of this slave node.
The present invention has following advantage with comparing based on single pass man-to-man acceptance method:
1, the present invention has realized parallel admittance, has shortened the admittance time, has reduced collision probability, has improved admittance efficient.
Based on single pass man-to-man acceptance method, an admittance cycle is only distributed a uplink and downlink explore frame time slot, and carrying is gone and the downlink signaling frame on the way respectively, so a Centroid can only carry out the admittance process of a slave node simultaneously, after the present node admittance is finished, other slave nodes could send admits request, so the admittance time is long.And the invention provides N two-way signalling path, and can realize the parallel admittance of maximum N slave node simultaneously, shortened the admittance time, improved admittance efficient.In addition, wait under the situation to be accepted simultaneously at a lot of slave nodes, based on single pass man-to-man acceptance method after present node is finished the admittance process, slave nodes to be accepted such as a large amount of send the request of admitting simultaneously at unique uplink detection frame slot, be easy to clash, thereby further prolonged the admittance time.And the present invention has divided N two-way signalling path, slave node is selected a passage at random from the two-way signalling path of a plurality of free time, send the request of admitting at its corresponding uplink detection frame slot, reduced the slave node quantity in the meeting of same uplink detection frame slot competition cashier machine, thereby reduced collision probability, improved admittance efficient.
2, the present invention has effectively saved channel resource when realizing parallel the admittance.
In parallel acceptance method of the present invention, only utilize a descending explore frame time slot that N road downlink signaling frame passage can be provided, the shared descending explore frame time slot of each slave node just can carry out down channel training and descending power control simultaneously, thereby has effectively saved channel resource.
Description of drawings
Fig. 1 is the realization flow figure of first embodiment of the invention;
Fig. 2 is the fixing planning chart of admittance cycle in the embodiment of the invention one;
Fig. 3 is the MAC layer signaling frame channel design figure in the embodiment of the invention;
Fig. 4 is the realization flow figure of second embodiment of the invention;
Fig. 5 is the admittance cycle Dynamic Programming figure in the embodiment of the invention two.
Embodiment
Below in conjunction with accompanying drawing content of the present invention is further elaborated.
Embodiment one
In this example, the network that the present invention uses is made up of a Centroid 0 and 64 slave nodes, prepares to carry out the admittance process after wherein four slave nodes 1,2,3,4 power on.
With reference to Fig. 1, the performing step of this example is as follows:
Step 1, allocation of channel resources may marks off the admittance cycle.
Adopt time division multiplexing/time division multiple access mechanism allocation of channel resources may, namely to descending employing time division multiplexing, to up employing time division multiple access, channel is divided into continuously and the admittance cycle of non-overlapping copies in time, each admittance cycle is contained descending explore frame time slot and uplink detection frame slot, and the zero-time of adjacent two descending explore frames is spaced apart an admittance cycle.In the present embodiment, admitting the time span in cycle is fixed length, is made as 20000us.
Step 2 adopts fixing planning in each admittance cycle, cook up the time slot of different purposes.
(2a) admit the original position in cycle to distribute a descending explore frame time slot at first, be used for Centroid and send descending explore frame;
(2b) admit the centre position in cycle to distribute a uplink detection frame slot at first, before this time slot, distribute
Individual uplink detection frame slot distributes after this time slot
Individual uplink detection frame slot, N uplink detection frame slot all sends uplink detection frame, N 〉=2 for slave node altogether;
(2c) after the descending explore frame time slot in first admittance cycle, distribute several downlink data frame slots and several descending control frame time slots, after N the uplink detection frame slot in first admittance cycle, distribute several upstream data frame slots and several upload control frame slots;
(2d) repeating step (2a)-step (2c) is planned all admittance cycles.
In the present embodiment, a program results of admitting the cycle, as shown in Figure 2.Marked several descending and upstream data frame slots among Fig. 2, several are descending and upload control frame slot, 1 descending explore frame time slot and 8 uplink detection frame slots.
Step 3, the descending and uplink detection frame slot that utilizes step 2 to cook up constitutes two-way signalling path.
(3a) utilize a down physical layer explore frame that sends at a descending explore frame time slot, mark off N descending MAC layer signaling frame passage, carrying N road descending MAC floor signaling frame;
(3b) utilize a upstream physical layer explore frame that sends at a uplink detection frame slot, a up MAC layer signaling frame passage is provided, carrying is capable MAC layer signaling frame on the way;
(3c) that N descending MAC layer signaling frame passage is corresponding with N up MAC layer signaling frame passage, constitute N two-way signalling path, namely i corresponding i the up MAC layer signaling frame passage of descending MAC layer signaling frame passage constitutes i two-way signalling path;
In the present embodiment, utilize 1 descending explore frame, go out 8 descending MAC layer signaling frame passages by frequency partition, utilize 8 uplink detection frames that 8 up MAC layer signaling frame passages are provided, with 8 corresponding 8 up MAC layer signaling frame passages of descending MAC layer signaling frame passage, constitute 8 two-way signalling paths, as shown in Figure 3.
Step 4, Centroid continues to send descending explore frame at descending explore frame time slot, and slave node continues to receive descending explore frame, and utilizes descending explore frame to finish descending power control and down channel training.
In the present embodiment, the descending explore frame that Centroid 0 sends has carried 8 tunnel descending MAC layer signaling frame, wherein the sign in the the 1 tunnel, the 4 road and the 7 tunnel descending MAC layer signaling frame is the free time, and its type is the sky frame, and the sign in other descending MAC layer signaling frames is busy;
Four slave nodes 1,2,3,4 continue to receive descending explore frame, detect the signal strength signal intensity of descending explore frame, according to the gain of signal strength signal intensity adjustment received power, make that receiving function accurately receives descending explore frame, finishes descending power and controls;
Four slave nodes 1,2,3,4 extract the training sequence signal from descending explore frame signal, estimate the physical layer channel parameter according to training sequence number signal, make slave node to select modulation format according to channel parameter, finish the down channel training.
In the present embodiment, slave node 1,2,3, sign in the 8 tunnel descending MAC layer signaling frame of the descending explore frame carrying of 4 inquiries, find the free time that is masked as in the the 1 tunnel, the 4 road and the 7 tunnel descending MAC layer signaling frame, it is idle obtaining the 1st, the 4th and the 7th two-way signalling path, and the number that counts idle two-way signaling channel is M=3.
Step 6, slave node is the selector channel from the two-way signalling path that counts, and the type of the up MAC layer signaling frame of its carrying is set to the request of admitting, and the explore frame time slot of going thereon sends the uplink detection frame:
First slave node 1 is selected the 7th two-way signalling path from three two-way signaling channels that count, the type of the 7 tunnel up MAC layer signaling frame is set to the request of admitting, and sends the uplink detection frame at the 7th uplink detection frame slot;
Second slave node 2 is selected the 1st two-way signalling path from three two-way signaling channels that count, the type of the 1 tunnel up MAC layer signaling frame is set to the request of admitting, and sends the uplink detection frame at the 1st uplink detection frame slot;
The 3rd slave node 3 and the 4th slave node 4, all from three two-way signaling channels that count, select the 4th two-way signalling path, the type of the 4 tunnel up MAC layer signaling frame is set to the admittance request, and sends the uplink detection frame simultaneously at the 4th uplink detection frame slot.
Step 7, Centroid are upgraded the sign in the downlink signaling frame of N road, send descending explore frame.
In the present embodiment, Centroid 0 has been received the uplink detection frame that slave node 2 sends at the 1st uplink detection frame slot, inquire about the type of the up MAC layer signaling frame of this frame carrying, the type that obtains this signaling frame is to admit request, so it is busy that Centroid 0 is set to the sign in the 1 tunnel descending MAC layer signaling frame, its type is set to the admittance response;
Because the admittance request of slave node 3 and the admittance request of slave node 4 clash at the 4th uplink detection frame slot, so Centroid 0 is not received the uplink detection frame at the 4th uplink detection frame slot, Centroid 0 keeps the free time that is masked as in the 4 tunnel descending MAC layer signaling frame, and the type that keeps this signaling frame is empty frame;
Centroid 0 has been received the uplink detection frame that slave node 1 sends at the 7th uplink detection frame slot, inquire about the type of the up MAC layer signaling frame of this frame carrying, the type that obtains this signaling frame is to admit request, so it is busy that Centroid 0 is set to the sign in the 7 tunnel descending MAC layer signaling frame, its type is set to the admittance response;
At descending explore frame time slot, Centroid 0 sends descending explore frame, this frame has carried 8 tunnel descending MAC layer signaling frame, wherein the sign of the the 1 tunnel, the 4 road and the 7 tunnel descending MAC layer signaling frame and type as mentioned above, sign and the type of other descending MAC layer signaling frames are constant.
Step 8, slave node receive descending explore frame, inquire about the sign in the descending MAC layer signaling frame of selected two-way signalling path correspondence.
In the present embodiment, slave node 1 receives descending explore frame, inquire in the 7 tunnel descending MAC layer signaling frame be masked as busy;
Slave node 2 receives descending explore frame, inquire in the 1 tunnel descending MAC layer signaling frame be masked as busy;
Slave node 3 and slave node 4 receive descending explore frame, all inquire the free time that is masked as in the 4 tunnel descending MAC layer signaling frame.
Step 9, the sign according in the descending MAC layer signaling frame of the two-way signalling path correspondence that inquires, carry out following operation:
Slave node 2 and Centroid 0 utilize the 1st two-way signalling path to finish up channel training and uplink power control;
Slave node 1 and Centroid 0 utilize the 7th two-way signalling path to finish up channel training and uplink power control;
Centroid 0 utilizes the 1st and the 7th two-way signalling path broadcast channel parameter;
Centroid 0 is set to the free time with the sign in the descending MAC layer signaling frame of the 1st and the 7th two-way signalling path correspondence, finish the admittance process of slave node 1 and slave node 2, slave node 1 and slave node 2 utilize Frame time slot and control frame time slot to carry out data communication afterwards;
Slave node 3 and slave node 4 are carried out back off algorithm, wait for several admittances cycle, return step 5.
Embodiment two
In this example, the network that the present invention uses is made up of a Centroid 0 and 32 slave nodes, prepares to carry out the admittance process after wherein two slave nodes 1,2 power on.
With reference to Fig. 4, the performing step of present embodiment is as follows:
Step 1, allocation of channel resources may marks off the admittance cycle.
Adopt time division multiplexing/time division multiple access mechanism allocation of channel resources may, namely to descending employing time division multiplexing, to up employing time division multiple access, channel is divided into continuously and the admittance cycle of non-overlapping copies in time, each admittance cycle is contained descending explore frame time slot and uplink detection frame slot, and the zero-time of adjacent two descending explore frames is spaced apart an admittance cycle.In the present embodiment, admitting the time span in cycle is fixed length, is made as 20000us.
Step 2 adopts Dynamic Programming in each admittance cycle, cook up the time slot of different purposes.
(2a) admit the original position in cycle to distribute a descending explore frame time slot at first, be used for Centroid and send descending explore frame;
(2b) admit the centre position in cycle to distribute a uplink detection frame slot at first, before this time slot, distribute
Individual uplink detection frame slot distributes after this time slot
Individual uplink detection frame slot, N uplink detection frame slot all sends uplink detection frame, N 〉=2 for slave node altogether;
(2c) after the descending explore frame time slot in first admittance cycle, distribute several downlink data frame slots and several descending control frame time slots, after N the uplink detection frame slot in first admittance cycle, distribute several upstream data frame slots and several upload control frame slots;
After (2d) first admitted end cycle, Centroid operation dispatching algorithm was planned second admittance cycle.The rest may be inferred, plans all admittance cycles.
In the present embodiment, two program resultses of admitting the cycle, as shown in Figure 5.First admittance cycle has been marked 3000 downlink data frame slots, 50 descending control frame time slots, 1000 upstream data frame slots, 50 upload control frame slots, 1 descending explore frame time slot and 8 uplink detection frame slots among Fig. 5, and second admittance cycle marked 2500 downlink data frame slots, 50 descending control frame time slots, 500 upstream data frame slots, 50 upload control frame slots, 1 descending explore frame time slot and 8 uplink detection frame slots.
Step 3, the descending and uplink detection frame slot that utilizes step 2 to cook up constitutes two-way signalling path.
(3a) utilize a down physical layer explore frame that sends at a descending explore frame time slot, mark off N descending MAC layer signaling frame passage, carrying N road descending MAC floor signaling frame;
(3b) utilize a upstream physical layer explore frame that sends at a uplink detection frame slot, a up MAC layer signaling frame passage is provided, carrying is capable MAC layer signaling frame on the way;
(3c) that N descending MAC layer signaling frame passage is corresponding with N up MAC layer signaling frame passage, constitute N two-way signalling path, namely i corresponding i the up MAC layer signaling frame passage of descending MAC layer signaling frame passage constitutes i two-way signalling path;
In the present embodiment, utilize 1 descending explore frame, go out 8 descending MAC layer signaling frame passages by frequency partition, utilize 8 uplink detection frames that 8 up MAC layer signaling frame passages are provided, with 8 corresponding 8 up MAC layer signaling frame passages of descending MAC layer signaling frame passage, constitute 8 two-way signalling paths, as shown in Figure 3.
Step 4, Centroid continues to send descending explore frame at descending explore frame time slot, and slave node continues to receive descending explore frame, and utilizes descending explore frame to finish descending power control and down channel training.
In the present embodiment, the descending explore frame that Centroid 0 sends has carried 8 tunnel descending MAC layer signaling frame, and wherein the sign in the descending MAC floor in each road signaling frame is busy;
Two slave nodes 1,2 continue to receive descending explore frame, detect the signal strength signal intensity of descending explore frame, according to the gain of signal strength signal intensity adjustment received power, make that receiving function accurately receives descending explore frame, finishes descending power and controls;
Two slave nodes 1,2 extract the training sequence signal from descending explore frame signal, estimate the physical layer channel parameter according to training sequence number signal, make slave node to select modulation format according to channel parameter, finish the down channel training.
In the present embodiment, sign in the 8 tunnel descending MAC layer signaling frame of the descending explore frame carrying of slave node 1,2 inquiry finds that the sign in this 8 tunnel descending MAC layer signaling frame is busy, obtain 8 two-way signalling paths and all have much to do, the number that counts idle two-way signaling channel is M=0.
Step 6, the idle two-way signaling channel that counts according to step 5 is 0, slave node 1 and slave node 2 return step 5 after waiting for this admittance end cycle.
Because counting idle two-way signaling channel is 0, namely in this admittance cycle, 8 two-way signalling paths all carry out the admittance process of other slave nodes, can't be used for slave node 1,2 send the uplink detection frame, so slave node 1 and slave node 2 all do not send the uplink detection frame in this admittance cycle, return step 5 after waiting for this admittance end cycle.
More than describing only is two instantiations of the present invention; do not constitute any limitation of the invention; obviously for those skilled in the art; after having understood content of the present invention and principle; all may be under the situation that does not deviate from the principle of the invention, structure; carry out various corrections and change on form and the details, but these are based on the correction of inventive concept with change still within claim protection range of the present invention.
Claims (7)
1. one kind based on multichannel parallel node acceptance method, comprises the steps:
(1) adopts time division multiplexing/time division multiple access mechanism allocation of channel resources may, to descending employing time division multiplexing, to up employing time division multiple access, channel is divided into continuously and the admittance cycle of non-overlapping copies in time;
(2) in each admittance cycle, adopt fixing planning or Dynamic Programming mode, cook up the time slot of following different purposes:
Be used for several downlink data frame slots that Centroid sends downlink data frame, be used for several upstream data frame slots that slave node sends uplink data frames;
Be used for several descending control frame time slots that Centroid sends descending control frame, be used for several upload control frame slots that slave node sends the upload control frame;
Be used for the descending explore frame time slot that Centroid sends a down physical layer explore frame;
Be used for N the uplink detection frame slot that slave node sends N upstream physical layer explore frame;
(3) a descending explore frame time slot and N uplink detection frame slot that utilizes step (2) planning to obtain constitutes N two-way signalling path:
(3a) utilize a down physical layer explore frame that sends at a descending explore frame time slot, mark off N descending MAC layer signaling frame passage, carrying N road descending MAC floor signaling frame, each passage carries one tunnel descending MAC layer signaling frame, described MAC layer refers to medium access control layer;
(3b) utilize a upstream physical layer explore frame that sends at a uplink detection frame slot, a up MAC layer signaling frame passage is provided, carrying is capable MAC layer signaling frame on the way;
(3c) that N descending MAC layer signaling frame passage is corresponding with N up MAC layer signaling frame passage, constitute N two-way signalling path, i.e. corresponding i the up MAC layer signaling frame passage of the descending MAC layer signaling frame passage of i, constitute i two-way signalling path, have sign in the descending MAC layer signaling frame of each descending MAC layer signaling frame passage carrying, show that the current state of two-way signalling path of its correspondence is in busy or idle;
(4) Centroid continues to send descending explore frame at descending explore frame time slot, slave node continues to receive descending explore frame, and utilize descending explore frame to carry out descending power control and down channel training, after finishing descending power control and down channel and training, enter step (5);
(5) slave node receives descending explore frame, the sign in the inquiry N road descending MAC floor signaling frame, and the number of the two-way signalling path that statistics is idle is M, if M=0, then waits for repeating step (5) behind this admittance end cycle; If M〉0, then in this M idle two-way signalling path, select a two-way signalling path at random, send the request of admitting at its corresponding uplink detection frame slot;
(6) Centroid upgrades the sign in the descending MAC floor signaling frame of N road, sends descending explore frame:
Admit request if Centroid is received at some uplink detection frame slots, then keep the sign in the descending MAC layer signaling frame of this time slot correspondence constant, at descending explore frame time slot, Centroid sends descending explore frame;
Admit request if Centroid has been received at some uplink detection frame slots, then the sign in the descending MAC layer signaling frame of this time slot correspondence is set to busyly, at descending explore frame time slot, the Centroid utilization should two-way signalling path sends to admit and responds;
(7) slave node receives descending explore frame, inquires about the sign in the descending MAC layer signaling frame of selected two-way signalling path correspondence:
If be masked as the free time, then conflict has taken place in the admittance request of slave node, and slave node is carried out back off algorithm, waits for several admittances cycle, returns step (5);
If be masked as busy, then the admittance request of slave node sends successfully, this two-way signalling path of slave node and Centroid utilization is finished up channel training or uplink power control, this two-way signalling path broadcast channel parameter of Centroid utilization, at last be set to the free time by the sign of Centroid in will the descending MAC layer signaling frame of this two-way signalling path correspondence, finish the admittance process of this slave node.
2. node acceptance method according to claim 1, in the admittance cycle in the wherein said step (1), its time length setting is fixed length or random length.
3. node acceptance method according to claim 1, fixedly planning mode in the wherein said step (2), refer to that in each admittance cycle the quantity of the quantity of Frame time slot and position, control frame time slot and the position of position, descending explore frame time slot, quantity and the position of uplink detection frame slot all are the same.
4. node acceptance method according to claim 1, Dynamic Programming mode in the wherein said step (2), refer to that in the difference admittance cycle position of the quantity of the quantity of Frame time slot and position, control frame time slot and position, descending explore frame time slot, the quantity of uplink detection frame slot and position all are to adjust.
5. node acceptance method according to claim 1, wherein step (3a) is described marks off N descending MAC layer signaling frame passage, is to divide by frequency partition or code word.
6. node acceptance method according to claim 1 utilizes descending explore frame to carry out descending power control in the wherein said step (4), be that the signal strength signal intensity of the descending explore frame that received according to detection by slave node is adjusted the gain of received power.
7. node acceptance method according to claim 1, utilize descending explore frame to carry out the down channel training in the wherein said step (4), be from the descending explore frame signal that receives, to extract the training sequence signal earlier by slave node, according to this training sequence signal the physical layer channel parameter estimated again.
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| CN105025587A (en) * | 2014-07-29 | 2015-11-04 | 魅族科技（中国）有限公司 | Wireless local area network access method, equipment and system |
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| CN109831831A (en) * | 2019-03-07 | 2019-05-31 | 西安电子科技大学 | Node acceptance method based on competition sequence |
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