CN107222932A - The time slot connection control method fed back based on neighborhood - Google Patents
The time slot connection control method fed back based on neighborhood Download PDFInfo
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- CN107222932A CN107222932A CN201710421628.2A CN201710421628A CN107222932A CN 107222932 A CN107222932 A CN 107222932A CN 201710421628 A CN201710421628 A CN 201710421628A CN 107222932 A CN107222932 A CN 107222932A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
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Abstract
The present invention proposes a kind of time slot connection control method fed back based on neighborhood, comprises the following steps：S1：Mac layer sends descending control frame to physical layer, and descending control frame includes transceiver mode control field and this terminal feedback fields, and transceiver mode control field and this terminal feedback fields are respectively used to control the transceiver mode of physical layer and to neighborhood terminal feedback content；S2：Mac layer receives the uplink service frame sent by physical layer, and uplink service frame includes neighborhood feedback fields, and neighborhood feedback fields are used for the feedback content for indicating this terminal of neighborhood terminal-pair, and return to step S1.The present invention uses a table as the transmission of feedback information using terminal room time slot, according to reasonable acquisition, analysis neighborhood feedack, the access speed of network is improved, time interval resource utilization rate is lifted, the time slot distribution and access of the broadcast type MSNET network based on TDMA can be efficiently applied to.
Description
Technical field
The present invention relates in communication technical field, more particularly to a kind of time slot connection control method fed back based on neighborhood.
Background technology
MANET (Mobile Ad Hoc Network, mobile ad-hoc network) refers between one group of node being in communication with each other
Formed, meet particular requirement, and the network worked in special scenes.Different from internet and Cellular Networks, between MANET nodes
The complete equality in status.MANET interior joints not only possess common mobile terminal function, while supporting multi-hop communication to turn between node
Hair, i.e., via node can help to forward packet.MSNET network is used for wireless scene, to meet the random movement between node.
Different from the user terminal in Cellular Networks, MSNET network node is independent of any prior base station disposed, or centromere
Point, its Access Algorithm uses fully distributed structure, and each Node distribution formula performs algorithm and quickly accessed, it is to avoid because some
The operation of the fault impact network of Centroid, possesses stronger survivability.In addition to the characteristics of distribution, self-organizing, node
Between mobility cause being continually changing for neighbor node in MSNET network, node will freely add or leave network, so as to need
The real-time multihop routing information of intermediate node forwarding generation, strengthens Routing Protocol robustness.
General communication network often uses application layer, transport layer, Internet, data link layer, five layer protocols of physical layer
Stack architecture.Physical layer therein is mainly responsible for the processing of actual data traffic, and the medium transmitted as business is the number on its upper strata
Service is provided according to link layer.Data link layer refers generally to LLC (Logical Link Control, logical link control sublayer) layer
With the general name of MAC (Media Access Control, MAC sublayer) layer, LLC layer completes the friendship of routing layer thereon
Mutually encapsulated with frame, MAC layer is then mainly responsible for interacting and control with physical layer, cooks up the sender for rationally accessing physical channel
Formula, and the physical layer data received is verified, so as to really ensure that Business Stream can be received and dispatched correctly.
In real network, the communication of MAC layer and physical layer needs to realize partial frame structure to be used as interactive interface.These frames
Structure includes descending control frame CCH of the MAC layer to physical layer, and MAC layer carries out the downlink business frame of business transmission using physical layer
The uplink service frame of MAC layer is sent on PDCH, and physical layer, according to the design of system, uplink service frame potentially includes up
CCH traffic frames and up PDCH traffic frames.
In the general broadcast type based on TDMA (Time Division Multiple Address, time division multiple acess)
In MSNET network, each node is communicated in the form of broadcast with neighborhood node, and each node selects special according to Access Algorithm
Fixed some time slots access physical channel, to realize the planning of time slot and conflict avoidance between node.In each time slot, node may
In transmission or reception, or silent status, this needs MAC to send working condition of the descending control frame to physical layer to physical layer
It is controlled, to complete the conversion of physical layer mode of operation.In order to be able to be rapidly completed the planning of time slot and connecing for network between node
Enter, node needs are distributed to judge the contention situation of itself time slot according to neighborhood feedback information, so as to adjust in time.
However, the time slot access control in presently relevant technology not suitable for the broadcast type MSNET network based on TDMA
Method processed, so as to cause that the access speed of network is slow, time interval resource utilization rate is low.
The content of the invention
It is contemplated that at least solving one of above-mentioned technical problem.
Therefore, it is an object of the invention to propose a kind of time slot connection control method fed back based on neighborhood, this method profit
The transmission of feedback information is used a table as with terminal room time slot, according to reasonable acquisition, analysis neighborhood feedack, network is improved
Access speed, lift time interval resource utilization rate, the time slot point of the broadcast type MSNET network based on TDMA can be efficiently applied to
With with access.
To achieve these goals, embodiments of the invention propose a kind of time slot Access Control side fed back based on neighborhood
Method, comprises the following steps：S1：Mac layer sends descending control frame to physical layer, and the descending control frame includes transceiver mode
Control field and this terminal feedback fields, the transceiver mode control field and this terminal feedback fields are respectively used to control physics
Layer transceiver mode and to neighborhood terminal feedback content；S2：Mac layer receives the uplink service frame sent by physical layer, institute
Stating uplink service frame includes neighborhood feedback fields, and the neighborhood feedback fields are used to indicate in the feedback of this terminal of neighborhood terminal-pair
Hold, and return to the step S1.
In addition, according to the above embodiment of the present invention can also be had such as based on the time slot connection control method that neighborhood feeds back
The technical characteristic added down：
In some instances, in the S1, when the transceiver mode control field is the first preset value, for indicating
The physical layer enters reception pattern, when the transceiver mode control field is the second preset value, for indicating the physics
Layer enters broadcast transmission pattern, when the transceiver mode control field is three preset value, for indicating that the physical layer is entered
Enter silent mode, wherein, if current time slots are used to receive slot contention bag, the S1 further comprises：Step S1a：Will
Transceiver mode control field in the slot control field of the descending control frame is set to the first preset value, controls afterwards described
MAC layer sends the descending control frame to the physical layer；If current time slots are used for sending time slots, competition is wrapped, the S1,
Further comprise：Step S1b：Transceiver mode control field in the slot control field of the descending control frame is set to
Two preset values, control the MAC layer to send the descending control frame to the physical layer afterwards；If current time slots without using
Physical layer operations, then the S1, further comprises：Step S1c：By the transmitting-receiving in the slot control field of the descending control frame
Mode control field is set to the 3rd preset value, controls the MAC layer to send the descending control frame to the physical layer afterwards.
In some instances, after the S1b, in addition to：Step S1b1：Control the MAC layer to empty this cycle to connect
The neighbor terminal information of receipts, prepares to record the receive information in a new cycle.
In some instances, after the S1b1, in addition to：Step S1b2：The MAC layer is controlled to the physical layer
Send downlink business frame.
In some instances, in the S1, described terminal feedback fields include this terminal in this cycle and are properly received
Neighborhood terminal number and/or neighborhood terminal time slot use information, described terminal use neighborhood feedback letter with default frame structure
Breath rationally carries this terminal feedback information, will be properly received feedback of the information and gives neighborhood terminal.
In some instances, in the S2, the neighborhood feedback fields include the transmission terminal number with it to correct
Receive the time slot feedback information of the terminal of slot contention bag, the transmission terminal number and the time slot for receiving uplink service frame
Number be used for generate this terminal feedback information.
In some instances, in the S2, when certain time slot in the neighborhood feedback information of the uplink service frame or certain
When terminal is the first preset value, for indicating that sending terminal proper reception of the time slot or the slot contention bag of the terminal, work as institute
When certain time slot or certain terminal stated in the neighborhood feedback information of uplink service frame are the second preset value, for indicating to send terminal not
The time slot or the slot contention bag of the terminal can be properly received, wherein, if the time slot correspondence time slot feedback information of this terminal is
First preset value, then the S2, further comprises：Step S2a：The MAC layer minute book cycle neighbor terminal number is controlled plus one,
This cycle success neighbours' number adds one, and return to step S1；If the time slot correspondence time slot feedback information of this terminal is second default
Value, then the S2, further comprises：Step S2b：Control the MAC layer minute book cycle neighbor terminal number plus one, this cycle into
Work(neighbours' number is constant, and when success neighbours' ratio is less than given threshold, terminal loses the right to use of the time slot, when competing other
Gap.
In some instances, in the S2b, the specific competitive way of other time slots of competition is：According to this terminal
The record of feedback fields, if the service condition of some time slot is free time, prioritized contention time slot, during if there is no the free time
Gap, then abandon the slot contention in this cycle.
In some instances, the part frame structure in the descending control frame and the uplink service frame includes check word
Section, the check field is used to verify the MAC layer or whether the frame structure field of physical layer reception is correct.
In some instances, described uplink service frame and downlink business frame further comprise：Frame type field, for referring to
Show the frame type of the uplink service frame；Data field, for carrying the data that MAC layer is sent or physical layer is received.
The time slot connection control method fed back based on neighborhood according to embodiments of the present invention, using the feedback information of neighborhood,
Each terminal can reasonable analysis itself time slot conflict situations, and when time slot is initial mac layer to physical layer send comprising control
The descending control frame of field processed, because the reasonability that each terminal time slot of neighborhood terminal-pair is used carries out rapid feedback, therefore the party
Method can provide quick time slot connection control method for the broadcast type MSNET network based on TDMA, improve the access speed of network
Degree, lifts time interval resource utilization rate.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is the flow chart of the time slot connection control method according to embodiments of the present invention fed back based on neighborhood；
Fig. 2 is the time slot in the time slot connection control method fed back based on neighborhood according to one specific embodiment of the present invention
Structural representation；
Fig. 3 is one kind in the time slot connection control method fed back based on neighborhood according to one specific embodiment of the present invention
Time slot uses the schematic diagram of table；
Fig. 4 is descending in the time slot connection control method fed back based on neighborhood according to one specific embodiment of the present invention
The structural representation of CCH control frames；
Fig. 5 is descending in the time slot connection control method fed back based on neighborhood according to one specific embodiment of the present invention
The structural representation of PDCH traffic frames；
Fig. 6 is up in the time slot connection control method fed back based on neighborhood according to one specific embodiment of the present invention
The structural representation of CCH traffic frames；
Fig. 7 is up in the time slot connection control method fed back based on neighborhood according to one specific embodiment of the present invention
The structural representation of PDCH traffic frames；
Fig. 8 is one kind in the time slot connection control method fed back based on neighborhood according to one specific embodiment of the present invention
Topological schematic diagram；
Fig. 9 is the competition in the time slot connection control method fed back based on neighborhood according to one specific embodiment of the present invention
Bag reception condition schematic diagram；
Figure 10 is another in the time slot connection control method fed back based on neighborhood according to one specific embodiment of the present invention
A kind of time slot uses the schematic diagram of table.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than indicate or dark
Specific orientation must be had, with specific azimuth configuration and operation by showing the device or element of meaning, therefore it is not intended that right
The limitation of the present invention.In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying and be relative
Importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
The time slot connection control method fed back based on neighborhood according to embodiments of the present invention is described below in conjunction with accompanying drawing.
Fig. 1 is the flow chart of the time slot connection control method according to an embodiment of the invention fed back based on neighborhood.Such as
Shown in Fig. 1, this method comprises the following steps：
Step S1：Mac layer sends descending control frame to physical layer, and descending control frame includes transceiver mode control field
With this terminal feedback fields, transceiver mode control field and this terminal feedback fields are respectively used to control the transceiver mode of physical layer
With to neighborhood terminal feedback content.
Step S2：Mac layer receives the uplink service frame sent by physical layer, and uplink service frame includes neighborhood feedback words
Section, neighborhood feedback fields are used for the feedback content for indicating this terminal of neighborhood terminal-pair, and return to step S1.
In one embodiment of the invention, in step sl, when transceiver mode control field is the first preset value, use
Enter reception pattern in instruction physical layer, when transceiver mode control field is the second preset value, for indicating that physical layer enters
Broadcast transmission pattern, when transceiver mode control field is three preset value, for indicating that physical layer enters silent mode, its
In,
If current time slots are used to receive slot contention bag, step S1 further comprises：
Step S1a：Transceiver mode control field in the slot control field of descending control frame is set into first to preset
Value, the descending control frame of mac layer transmission afterwards to physical layer
If current time slots, which are used for sending time slots, competes bag, step S1 further comprises：
Step S1b：Transceiver mode control field in the slot control field of descending control frame is set into second to preset
Value, the descending control frame of mac layer transmission afterwards to physical layer；
If current time slots further comprise without using physical layer operations, step S1：
Step S1c：Transceiver mode control field in the slot control field of descending control frame is set into the 3rd to preset
Value, the descending control frame of mac layer transmission afterwards to physical layer.
Further, in one embodiment of the invention, after step S1b, in addition to：
Step S1b1：Mac layer empties the neighbor terminal information of this cycle reception, prepares to record the reception in a new cycle
Information.
Further, after step S1b1, in addition to：
Step S1b2：Mac layer sends downlink business frame to physical layer.
Wherein, in one embodiment of the invention, in step sl, this terminal feedback fields include this end in this cycle
The neighborhood terminal number and/or neighborhood terminal time slot use information being properly received are held, this terminal is (i.e. suitable with default frame structure
Frame structure), rationally carry this terminal feedback information with neighborhood feedback information, feedback of the information will be properly received and give neighborhood terminal.
In one embodiment of the invention, in step s 2, neighborhood feedback fields include the transmission terminal number and its
To the time slot feedback information for the terminal for having correctly received slot contention bag, send terminal number and receive uplink service frame when
Gap number is used to generate this terminal feedback information.
Based on this, in one embodiment of the invention, in step s 2, when in the neighborhood feedback information of uplink service frame
Certain time slot or certain terminal be the first preset value when, for indicate send terminal proper reception of the time slot or the time slot of the terminal
Competition bag, when certain time slot or certain terminal in the neighborhood feedback information of uplink service frame are the second preset value, for indicating hair
Make arrangements for his funeral to hold to fail and receive the slot contention bag of the time slot or the terminal, wherein,
If the time slot correspondence time slot feedback information of this terminal is the first preset value, step S2 further comprises：
S2a：Mac layer minute book cycle neighbor terminal number adds one, and this cycle success neighbours' number adds one, and return to step
S1；
If the time slot correspondence time slot feedback information of this terminal is the second preset value, step S2 further comprises：
S2b：Mac layer minute book cycle neighbor terminal number adds one, and this cycle success neighbours' number is constant, as success neighbours
When ratio is less than given threshold (when the neighbours' ratio that succeeds is relatively low), terminal loses the right to use of the time slot, competes other time slots.
Specifically, in step S2b, the specific competitive way for competing other time slots is：According to this terminal feedback fields
Record, if the service condition of some time slot is the free time, the prioritized contention time slot if there is no free timeslot, is then abandoned
The slot contention in this cycle.
In one embodiment of the invention, the part frame structure in above-described descending control frame and uplink service frame
Comprising check field, check field is used to verify MAC layer or whether the frame structure field of physical layer reception is correct.
In one embodiment of the invention, above-described uplink service frame and downlink business frame further comprise：Frame
Type field, the frame type for indicating uplink service frame；Data field, for carrying, MAC layer is sent or physical layer is received
Data.
The time slot connection control method fed back based on neighborhood according to embodiments of the present invention, using the feedback information of neighborhood,
Each terminal can reasonable analysis itself time slot conflict situations, and when time slot is initial mac layer to physical layer send comprising control
The descending control frame of field processed, because the reasonability that each terminal time slot of neighborhood terminal-pair is used carries out rapid feedback, therefore the party
Method can provide quick time slot connection control method for the broadcast type MSNET network based on TDMA, improve the access speed of network
Degree, lifts time interval resource utilization rate.
For the ease of being better understood from the present invention, below in conjunction with accompanying drawing, with specific embodiment to above-mentioned implementation of the invention
Example based on the time slot connection control method that neighborhood feeds back carry out in detail, specifically exemplary description.
Embodiment 1
In the present embodiment, MAC layer is responsible for the planning and division of time slot, is controlled to send with receiving patrolling for time slot by MAC layer
Function is collected, and reception logic will be sent in the form of frames and notifies physical layer, physical layer is not related to slot concept in itself.
Structure of time slot in the present embodiment is with reference to shown in Fig. 2, and each cycle includes n control time slot and n data slot,
Control in time slot section, terminal is randomly choosed one or more of time slots and participate in competition, to be obtained data by MAC layer control
The right to use of corresponding one or more time slots in time slot section., can be with now if terminal take part in competition in some time slot
Gap is in a cycle of starting point, to intercept the feedback of this time slot of neighborhood this terminal of terminal-pair, this terminal will be according to the feedback letter
Breath, differentiates the conflict situations taken produced by this time slot, and choose whether to abandon the competition of this time slot.Structure of time slot is divided into control
In section and data segment, control section, terminal selection sends or received in CCH slot contention bags, data segment, and terminal selection sends or connect
Receive data traffic packet.
In the present embodiment, shown in Format Reference Fig. 3 of feedback information.Each terminal safeguards that includes a n within each cycle
The time slot of bit uses table.Service condition of the time slot using table to n time slot in the minute book cycle.When this terminal exists
In some time slot in this cycle, when receiving and only have received the bag that a terminal is sent, by the time slot of this terminal maintenance
Using the corresponding bit of table to be set to the first preset value, to indicate that this terminal assert that this cycle, now gap can be with Lothrus apterus just
Really receive data；When this terminal is in some time slot within this cycle, more than one terminal is not received by or have received
During the bag of transmission, by the time slot of this terminal maintenance using the corresponding bit of table to be set to the second preset value, to indicate this cycle
This time slot may generate conflict due to multiple terminal challenges.
Time slot is used for the service condition of time slot in the neighborhood that minute book terminal is collected using table, and the time slot is used into feelings
Condition is used as the feedback to neighborhood.When this terminal mac layer sends descending control frame to physical layer and is set to physical layer to send mould
During formula, MAC layer should provide the time slot to physical layer simultaneously and use table, so that in the form of frames, the information that this terminal is collected
The whole ends fed back to the forms of broadcasting in neighborhood.
When the time slot that terminal receives neighborhood other-end uses table, terminal sends minute book terminal using in time slot
Bag whether can be properly received with Lothrus apterus by neighborhood other-end.When the 3rd time slot of some terminal current competitive, and connect
When the time slot for receiving a neighbor terminal uses table, such as shown in Fig. 3, this time slot uses the 3rd bit in table pre- for second
If value, then illustrate the neighbours received within this cycle and be not properly received the competition bag of the terminal.Terminal can be according to can
Decide whether to abandon the competition of this time slot to be properly received the neighbor terminal ratio of itself competition bag.
Each time slot is as follows in the presence of five kinds of possible reiving/transmitting states in the present embodiment：
1) for one the time slot of CCH slot contention bags will be sent, MAC layer is given when time slot is initial under physical layer
Row CCH control frames, control frame is used to control physical layer that state is set into sending mode, and the time slot of this terminal is made using table
For feedback information, neighborhood remaining terminal is broadcast to, to quantify its conflict serious conditions for using time slot.
2) for one the time slot of CCH slot contention bags will be received, MAC layer is given when time slot is initial under physical layer
Row CCH control frames, control frame is used to control physical layer that state is set into reception pattern.MAC prepares to receive physical layer afterwards
Up CCH traffic frames.Physical layer parses control signal frame after descending control frame is received, and it is controlled be adjusted to reception pattern,
Receive and time slot is partially loaded up CCH traffic frames using table etc. immediately after competition CCH bags and MAC layer is sent to.
3) PDCH time slot will be sent for one, MAC layer issues descending PDCH industry when time slot is initial to physical layer
Business frame, traffic frame is used to indicate that state is set to sending mode by physical layer in current PDCH time slots.MAC layer selection sends one
Or multiple downlink business frames, to provide the business datum that will be sent for physical layer.
4) PDCH time slot will be received for one, MAC layer issues descending PDCH industry when time slot is initial to physical layer
Business frame, traffic frame is used to indicate that state is set to reception pattern by physical layer in current PDCH time slots.MAC prepares to receive thing afterwards
Manage the up PDCH traffic frames of layer.Physical layer parses business frame structure after downlink business frame is received, and controlled is adjusted to connect
Receipts pattern, receives that data portion is graded immediately after competition PDCH bags and loads up PDCH traffic frames and be sent to MAC layer.
5) for a time slot without physical layer operations, MAC layer issues descending control when time slot is initial to physical layer
Frame, control physical layer enters resting state, and physical layer, which is received, enters resting state after descending control frame, without modulatedemodulate
Adjust, until receiving the new descending control frame that MAC is issued.
Downstream interface design process is as follows：
Downstream interface includes descending CCH control frames and descending PDCH traffic frames.
Descending CCH control frames are issued to physical layer, for controlling in the time slot initial segment of each control time slot by MAC layer
Time slot is simultaneously transferred to physical layer by the reiving/transmitting state of physical layer using table.If the control time slot is sending time slots, physical layer
Transceiver mode is adjusted to according to the instruction of control frame to send, and the time slot of this terminal is used a table as into feedback with extensive shape
Formula is sent to neighborhood terminal；If receiving time slot during the control time slot, physical layer is according to the instruction of control frame by transceiver mode
It is adjusted to receive, attempts to receive the competition CCH bags of neighbor terminal, if unsuccessful demodulation, related frame structure therein is extracted immediately
Load up CCH traffic frames and be sent to MAC layer.
Descending PDCH traffic frames are issued to physical layer, for controlling in the time slot initial segment of each data slot by MAC layer
The reiving/transmitting state of physical layer and by the data transfer that will be sent to physical layer.If the data slot is sending time slots, physics
Transceiver mode is adjusted to send by layer according to the instruction of traffic frame, and MAC layer can continue to send one or more downlink business frames,
There is provided comprising the data service for needing physical layer to send；If the time slot is to receive time slot, physical layer is according to the instruction of traffic frame
Transceiver mode is adjusted to receive, attempts to receive the competition PDCH bags of neighbor terminal, if unsuccessful demodulation, extracts immediately therein
Related frame structure loads up PDCH traffic frames and is sent to MAC layer.
The design process of descending CCH control frames is as follows：
Descending CCH control signal frames are as shown in Figure 4.
Type is used to indicate that this frame belongs to descending CCH control frames, descending PDCH traffic frames, up CCH traffic frames or up
PDCH traffic frames；
Transmitting-receiving node is numbered for indicating that source terminal is numbered, this terminal number and purpose terminal number；
The check bit obtained after calculating contents such as type, transmitting-receiving node numberings is verified as, is examined for physical layer
Whether the content is properly received；
Time slot is used for the service condition of time slot in the neighborhood that minute book terminal is collected using table, and the time slot is used into feelings
Condition is used as the feedback to neighborhood.
Transmitting-receiving control is used to indicate the reiving/transmitting state that physical layer current time slots should be set；
The check bit obtained after being calculated using the content such as table, transmitting-receiving control, standby time slot is verified as, for physics
Layer examines whether the content is properly received.
The design process of descending PDCH traffic frames is as follows：
Descending PDCH business frame structure is as shown in Figure 5.
Type is used to indicate that this frame belongs to descending CCH control frames, descending PDCH traffic frames, up CCH traffic frames or up
PDCH traffic frames；
Transmitting-receiving node is numbered for indicating that source terminal is numbered, this terminal number and purpose terminal number；
The check bit obtained after calculating contents such as type, transmitting-receiving node numberings is verified as, is examined for physical layer
Whether the content is properly received；
Transmitting-receiving control is used to indicate the reiving/transmitting state that physical layer current time slots should be set；
The business datum that data division needs to transmit comprising MAC layer；
The check bit obtained after content is calculated of grading to transmitting-receiving control, data portion is verified as, is examined for physical layer
Whether the content is properly received.
The design process of upstream Interface is as follows：
Upstream Interface includes two kinds of uplink service frames, up CCH traffic frames and up PDCH traffic frames.
Up CCH control frames it is each control time slot time slot initial segment, MAC layer indicate physical layer switch to reception pattern
Afterwards.Parsing is formed immediately after physical layer receives the competition CCH bags of other-end, for providing other-end to MAC layer
The time slot of feedback uses the information such as table.
Up PDCH traffic frames each data slot time slot initial segment, MAC layer indicate physical layer switch to reception mould
After formula.Parsing is formed immediately after physical layer receives the competition PDCH bags of other-end, for providing other ends to MAC layer
Hold the information such as the data of transmission.
The design process of up CCH traffic frames is as follows：
Up CCH business frame structure is as shown in Figure 6.
Type is used to indicate that this frame belongs to descending CCH control frames, descending PDCH traffic frames, up CCH traffic frames or up
PDCH traffic frames；
Transmitting-receiving node is numbered for indicating that source terminal is numbered, this terminal number and purpose terminal number；
The check bit obtained after calculating contents such as type, transmitting-receiving node numberings is verified as, is examined for physical layer
Whether the content is properly received；
Time slot includes the time slot service condition that neighborhood terminal is fed back using table, indicates that neighborhood terminal has correctly received competition bag
Timeslot case.
SNR is received in competition packet procedures for physical layer and is measured the SNR value drawn；
The check bit obtained after being calculated using the content such as table, SNR, standby time slot is verified as, for physical layer inspection
Test whether the content is properly received.
The design process of up PDCH traffic frames is as follows：
Up PDCH business frame structure is as shown in Figure 7.
Type is used to indicate that this frame belongs to descending CCH control frames, descending PDCH traffic frames, up CCH traffic frames or up
PDCH traffic frames；
Transmitting-receiving node is numbered for indicating that source terminal is numbered, this terminal number and purpose terminal number；
The check bit obtained after calculating contents such as type, transmitting-receiving node numberings is verified as, is examined for physical layer
Whether the content is properly received；
SNR is received in competition packet procedures for physical layer and is measured the SNR value drawn；
Data division, which is included, needs the business datum of the neighbor terminal for being transferred to MAC layer transmission；
The check bit obtained after content is calculated of grading to SNR, data portion is verified as, is examined for physical layer in described
Whether appearance is properly received.
Specifically, it is a network for possessing 4 nodes with reference to shown in Fig. 8, when network is started shooting, they randomly choose
Time slot is participated in slot contention.
Further, with reference to shown in Fig. 9 and Figure 10, randomly selected sending time slots after network start described in respectively Fig. 8
The time slot of each node uses table during with end cycle.Terminal A sends competition bag in time slot 1, and terminal B and C simultaneous selection are in time slot 2
Competition bag is sent, time slot 3 is without terminal challenge, and terminal D then sends competition bag in time slot 4.Due to topological relation and depositing for conflicting
Each terminal possibly can not all have correctly received the competition bag of other-end, and reception condition is as shown in Figure 9.First time slot
Interior, terminal B and C can be properly received in terminal A competition bag, second time slot, due to the conflict between B and C, terminal A without
The data of correct any one terminal of uppick of method, but the competition that terminal D can be sent due to topological relation with uppick terminal C
Bag, to the 4th time slot, terminal C can correct uppick terminal D competition bag.
In the control section time slot of next cycle, each terminal needs respective time slot feeding back to neighbours' end using table
End.Based on the reception condition of each terminal of last cycle, each terminal fills respective time slot using table, as shown in Figure 10.When depositing
When the terminal B and terminal C of conflict receive the feedback information of neighborhood, terminal B has found that no other-end receives oneself, and
Terminal C has found have a terminal i.e. terminal D to receive oneself.(can be absolute using neighbours according to certain judgment condition
The condition such as number or neighbours' proportional numerical value), terminal B is likely to abandon the competition of this time slot prior to terminal C, so that second
In the individual cycle, terminal B will mac layer send descending control frame in other time slots, control physical layer changes sending time slots.
When changing sending time slots, terminal can use the record case of table according to the time slot in this cycle, and selection is still not used by
Time slot carry out the right to use competition so that reduce produce conflict possibility.
To sum up, in the present embodiment, the time slot connection control method that should be fed back based on neighborhood will not be same due to conflict terminal
When abandon the time slot right to use, and bigger possible leave last conflict situations most slight terminal successfully to get hair
Time slot is sent, thus a quick time slot access capability can be provided for the broadcast type MANET networkings based on TDMA, that is, is improved
The access speed of network, improves time interval resource utilization rate.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is by claim and its equivalent limits.
Claims (10)
1. a kind of time slot connection control method fed back based on neighborhood, it is characterised in that comprise the following steps：
S1：Mac layer sends descending control frame to physical layer, and the descending control frame includes transceiver mode control field and this
Terminal feedback fields, the transceiver mode control field and this terminal feedback fields are respectively used to control the transceiver mode of physical layer
With to neighborhood terminal feedback content；
S2：Mac layer receives the uplink service frame sent by physical layer, and the uplink service frame includes neighborhood feedback fields,
The neighborhood feedback fields are used for the feedback content for indicating this terminal of neighborhood terminal-pair, and return to the step S1.
2. the time slot connection control method according to claim 1 fed back based on neighborhood, it is characterised in that in the S1
In, when the transceiver mode control field is the first preset value, for indicating that the physical layer enters reception pattern, when described
When transceiver mode control field is the second preset value, for indicating that the physical layer enters broadcast transmission pattern, when the transmitting-receiving
When mode control field is three preset value, for indicating that the physical layer enters silent mode, wherein,
If current time slots are used to receive slot contention bag, the S1 further comprises：
S1a：Transceiver mode control field in the slot control field of the descending control frame is set to the first preset value, it
After control the MAC layer to send the descending control frame to the physical layer；
If current time slots, which are used for sending time slots, competes bag, the S1 further comprises：
S1b：Transceiver mode control field in the slot control field of the descending control frame is set to the second preset value, it
After control the MAC layer to send the descending control frame to the physical layer；
If current time slots are without using physical layer operations, the S1 further comprises：
S1c：Transceiver mode control field in the slot control field of the descending control frame is set to the 3rd preset value, it
After control the MAC layer to send the descending control frame to the physical layer.
3. the time slot connection control method according to claim 2 fed back based on neighborhood, it is characterised in that in the S1b
Afterwards, in addition to：
S1b1：Control the MAC layer to empty the neighbor terminal information of this cycle reception, prepare to record the reception letter in a new cycle
Breath.
4. the time slot connection control method according to claim 3 fed back based on neighborhood, it is characterised in that in the S1b1
Afterwards, in addition to：
S1b2：The MAC layer is controlled to send downlink business frame to the physical layer.
5. the time slot connection control method according to claim 1 fed back based on neighborhood, it is characterised in that in the S1
In, when described terminal feedback fields include the neighborhood terminal number and/or neighborhood terminal that this terminal is properly received in this cycle
Gap use information, described terminal rationally carries this terminal feedback information with default frame structure with neighborhood feedback information, will just
True receive information feeds back to neighborhood terminal.
6. the time slot connection control method according to claim 1 fed back based on neighborhood, it is characterised in that in the S2
In, the neighborhood feedback fields include the transmission terminal number and it is anti-to the time slot for having correctly received the terminal of slot contention bag
Feedforward information, the transmission terminal number and receive uplink service frame timeslot number be used for generate this terminal feedback information.
7. the time slot connection control method fed back based on neighborhood according to claim 1 or 6, it is characterised in that described
In S2, when certain time slot or certain terminal in the neighborhood feedback information of the uplink service frame are the first preset value, for indicating
Send terminal and proper reception of the time slot or the slot contention bag of the terminal, when in the neighborhood feedback information of the uplink service frame
Certain time slot or certain terminal when being the second preset value, for indicate to send terminal fail receive the time slot or the terminal when
Gap competition bag, wherein,
If the time slot correspondence time slot feedback information of this terminal is the first preset value, the S2 further comprises：
S2a：The MAC layer minute book cycle neighbor terminal number is controlled plus one, this cycle success neighbours' number adds one, and return to step
S1；
If the time slot correspondence time slot feedback information of this terminal is the second preset value, the S2 further comprises：
S2b：The MAC layer minute book cycle neighbor terminal number is controlled plus one, this cycle success neighbours' number is constant, as success neighbours
When ratio is less than given threshold, terminal loses the right to use of the time slot, competes other time slots.
8. the time slot connection control method according to claim 7 fed back based on neighborhood, it is characterised in that in the S2b
In, the specific competitive way of other time slots of competition is：
According to the record of this terminal feedback fields, if the service condition of some time slot is the free time, the prioritized contention time slot, such as
Free timeslot is not present in fruit, then abandons the slot contention in this cycle.
9. the time slot connection control method fed back based on neighborhood according to claim 1 or 4, it is characterised in that under described
Part frame structure in row control frame and the uplink service frame includes check field, and the check field is described for verifying
Whether the frame structure field that MAC layer or the physical layer are received is correct.
10. the time slot connection control method fed back based on neighborhood according to claim 1 or 4, it is characterised in that described
Uplink service frame and downlink business frame further comprise：
Frame type field, the frame type for indicating the uplink service frame；
Data field, for carrying the data that MAC layer is sent or physical layer is received.
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