CN112616188A - SDM/SDMA central station transmitting channel packet-by-packet scheduling method - Google Patents
SDM/SDMA central station transmitting channel packet-by-packet scheduling method Download PDFInfo
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- CN112616188A CN112616188A CN202011386472.7A CN202011386472A CN112616188A CN 112616188 A CN112616188 A CN 112616188A CN 202011386472 A CN202011386472 A CN 202011386472A CN 112616188 A CN112616188 A CN 112616188A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a packet-by-packet scheduling method for SDM/SDMA central station transmitting channels. The method comprises the following steps: and allocating a transmission channel and transmission time for the data packet needing to pass through the central station, adjusting the antenna to point to the position of the user station, and transmitting the data packet at the allocated transmission time. The invention uses the extremely narrow beam antenna covering the position of 1 user, which can greatly improve the space division multiplexing efficiency and the system communication capacity; very narrow beam antennas concentrate transmit power in a small area, which may save transmit power or increase information rates. And because the central station antenna is directed to adjust packet by packet, the communication signal does not need to cover all communication areas in real time, and the real-time communication of users at any place in the communication areas can be realized.
Description
Technical Field
The invention relates to a central station transmitting channel scheduling method, in particular to a method for scheduling a central station transmitting channel packet by packet according to the space position of a user station, adjusting the point beam antenna direction of the transmitting channel and realizing point-to-point space division communication between the central station and the user station, belonging to the technical field of communication.
Background
With the increasing demand of the human society for terrestrial mobile communication, space communication and satellite communication, radio frequency resources are increasingly strained. It is a direction of development of wireless communication technology to fully utilize limited frequency resources and obtain maximum communication capacity.
In recent years, with the development of smart antenna technology, space division communication has been increasingly researched and applied. Space Division communication is classified into Space Division Multiplexing (SDM) and Space Division Multiple Access (SDMA) according to application modes. SDM is a multiplexing scheme that uses spatial division to form different channels. SDMA is a multiple access scheme that distinguishes each user according to their spatial location. SDM and SDMA can enable users at different locations to communicate using the same frequency at the same time without interfering with each other, thereby significantly increasing the capacity of the communication system.
At present, the main application mode of space division communication is a multi-beam parallel system, i.e. a central station covers the whole user area with a plurality of parallel narrow beams with the same frequency, instead of the traditional TDM/TDMA system (hereinafter referred to as TD system) covering the whole user area with 1 wide beam.
In order to make full use of the maximum potential of space division communication and to fully utilize frequency resources, patent 201610471412.2 proposes an SDM/SDMA communication method based on real-time adjustment of the pointing direction of a spot beam antenna, and particularly an SDM/SDMA communication method based on packet-by-packet adjustment of the pointing direction of a spot beam antenna based on the position of a subscriber station, so that the capacity of a wireless communication system is greatly improved.
Disclosure of Invention
The invention aims to provide a SDM/SDMA central station transmitting channel packet-by-packet scheduling method, which allocates transmitting channels and transmitting time slots for data packets according to the working state of each transmitting channel of a central station, the working state of a user station and the geographic position of the user station before each data packet is transmitted, and adjusts the direction of an antenna of each transmitting channel, thereby realizing space division multiplexing point-to-point communication based on a single data packet and a single user station.
The invention is characterized in that the method comprises two stages of initialization and operation, the operation stage comprises 3 parallel operation processes, a data receiving process, a channel distribution process and a data sending process, and each stage and process sequentially comprises the following steps:
A. an initialization stage: carrying out initialization setting on the system running state;
step A1, closing all sending channels, adjusting all sending communication antenna directions to initial positions, setting all sending channel working states to be idle, clearing all sending channel data buffer units, and marking all time slots in all user station receiving time slot allocation tables to be idle.
B. And (3) a system operation stage: distributing a sending channel and sending time for the data packet, adjusting the antenna to point to the position of the user station, and sending the data packet at the distributed sending time;
b1: and (3) a data receiving process: storing the data packet to be forwarded by the central station into a scheduling buffer area;
step B1.1, the central station receives a data packet which needs to be forwarded to the user station;
step B1.2, the central station inserts the data packet into a sending queue of a scheduling buffer area according to a preset priority queuing strategy, queues for accessing a sending channel, and discards the data packet if the buffer area is full or the queue length reaches the maximum value;
b2: and (3) channel allocation process: distributing sending channels for the data packets in the sending queue one by one;
b2.1, inquiring the working state of a sending channel, randomly selecting 1 channel with an idle state, and if all the channels are busy, continuing to inquire until the channel with the idle state appears;
b2.2, setting the state of the channel selected in the step B2.1 as busy;
b2.3, inquiring the sending queue, outputting the data packet at the front end of the queue to the sending buffer unit of the sending channel selected in the step B2.1, and if the sending queue is empty, continuing inquiring until a data packet waiting for sending exists in the queue;
b2.5, repeating the steps B2.1, B2.2 and B2.3, and outputting the data packets in the sending queue to a sending buffer unit of the sending channel in sequence;
b3: and (3) a data sending process: adjusting the direction of the transmitting channel antenna to the position of the subscriber station, and transmitting the data packet to the receiving subscriber station;
b3.1, detecting a sending cache unit of the sending channel, reading a data packet to be sent, and if the sending cache unit is empty, continuing detection;
b3.2, analyzing the destination address of the data packet called from the sending cache unit;
b3.3, according to the destination address of the data packet, inquiring a receiving time slot distribution table of the user station receiving the data packet, acquiring the starting moment t of the nearest idle time slot, if the value of t minus the current time is greater than the overtime H, discarding the data packet, and executing the step B3.9; if the value obtained by subtracting t from the current time value is more than or equal to P, setting t as the sending time, and marking the time slot starting at the time t of the user station as busy in a time slot allocation table; if the subtraction of T and the current time value is less than P, setting the T + kT time as the sending time, and marking the time slots of the subscriber station starting at the T, T + T, … and T + kT times as busy in the time slot allocation table;
b3.4, packing the data packet into a burst frame to wait for transmission;
b3.5, inquiring a user station geographical position information table according to the destination address of the data packet to acquire the geographical position information of the user station;
b3.6, calculating the pointing parameters of the transmitting channel antenna according to the geographical position information of the user station acquired in the step 3.5;
b3.7, adjusting the direction of the antenna of the sending channel according to the direction parameters of the antenna calculated in the step 3.6, so that the signal beam points to the position of the user station corresponding to the destination address in the step B3.2;
b3.8, modulating, amplifying power and sending the burst frame in the step B3.4 at the sending time set in the step B3.3;
b3.9, clearing the sending buffer unit and setting the working state of the sending channel to be idle;
and B3.10, repeating the steps B3.1 to B3.9.
In the method, B3 is a working process of a sending channel;
in the method, the central station has 1B 1 process, 1B 2 process and a plurality of B3 processes;
in the method, a plurality of B3 processes run in parallel;
in the method, the length of the data packet is a set value;
in the method, P is a set value, and the value of P is larger than the time required for executing the steps B3.4 to B3.7;
in the method, the overtime time H is a design value, and H is greater than P;
in the method, the time slot length T is the time for transmitting 1 burst frame by the transmitting channel,
in the method, k is the minimum integer value which enables t + kT to be subtracted by the current time to be larger than P;
in the method, the central station stores a user station geographical position information table, and the table comprises the longitude, the latitude and the altitude of the current position of all user stations;
in the method, the central station stores all the user station receiving time slot distribution tables;
in the method, the configuration of each transmitting channel transmitter and each antenna of the central station is the same, and the carrier central frequency, the occupied bandwidth and the information rate are the same.
The invention provides a dispatching method of SDM/SDMA central station sending channels based on Chinese patent 201610471412.2, which adjusts the sending antenna direction in real time through a plurality of sending channels of the dispatching central station, and realizes space division multiplexing point-to-point communication based on a single data packet and a single user station. Has the following advantages:
1. because the central station adjusts the antenna pointing direction according to the geographical location information of the subscriber station receiving the data packet before transmitting each data packet, the antenna beam only needs to cover 1 subscriber,
2. the extremely narrow beam antenna covering the position of 1 user is used, so that the space division multiplexing efficiency can be greatly improved, and the system communication capacity is improved;
3. very narrow beam antennas concentrate transmit power in a small area, which may save transmit power or increase information rates.
4. Because the direction of the central station antenna is adjusted packet by packet, the communication signal does not need to cover all communication areas in real time, and the real-time communication of users at any place in the communication areas can be realized.
Drawings
FIG. 1 is a schematic diagram of a SDM/SDMA central station transmitting channel packet-by-packet scheduling method.
Fig. 2 illustrates a burst frame structure according to the present invention.
FIG. 3 is a flow chart of a channel assignment process of the present invention.
FIG. 4 is a flow chart of a data transmission process line of the present invention.
Detailed Description
As shown in fig. 1-4, a typical application of the SDM/SDMA central station transmit channel packet-by-packet scheduling method of the present invention is the transmission of downlink communications from a central station to subscriber stations in a wireless communication network. As shown in fig. 1. In fig. 1, the central station is equipped with n transmission channels, each transmission channel has 1 transmission buffer unit, 1 transmitter and 1 spot beam antenna. The data packets to be forwarded by the central station are firstly transmitted to a data caching and queuing module, and are queued to be transmitted to a transmission channel according to a preset priority queuing strategy. And the sending channel scheduling module extracts the data packets of the data caching and queuing module one by one and allocates sending channels for the extracted data packets. The transmission channel scheduling module calls the data packet into a transmission cache unit of a selected transmission channel, the transmission time control module allocates a transmission time slot for the data packet according to the user station access time slot allocation condition and controls the transmission time of the data packet, the antenna pointing control module calculates the pointing direction of the spot beam antenna according to the geographical position information of the user station, and the pointing direction of the spot beam antenna is adjusted to the position of the user station for receiving the data packet before the transmission time begins; the transmitter transmits data to the subscriber station at the assigned transmission time.
The invention sets the overtime time of the data packet as H, the time for the central station to complete the encapsulation of a channel burst frame, the inquiry of the geographical position of the user station, the calculation of the antenna direction and the adjustment of the antenna direction as P, the time for each transmission channel of the central station to transmit a burst frame is T, if the current time is T0The latest transmission time of the user data packet is t1The value of the transmission time t is as follows:
if t is1-t0Discarding the data packet if the number is more than or equal to H;
such as P ≦ t1-t0<H, then t is t ═ t1；
Such as t1-t0<P, then t equals t1+ kT, k being such that t-t0The minimum integer of more than or equal to P.
The central station transmits data to the subscriber station in burst frames, the burst frames having a structure as shown in fig. 2 and consisting of sync words, unique words, control words, and data packets. The data packet is the data packet received by the subscriber station and required to be forwarded to the subscriber.
Claims (9)
1. A SDM/SDMA central station transmitting channel packet-by-packet scheduling method is characterized in that the method comprises the following steps: and allocating a transmission channel and transmission time for the data packet needing to pass through the central station, adjusting the antenna to point to the position of the user station, and transmitting the data packet at the allocated transmission time.
2. The SDM/SDMA central station transmit channel packet-by-packet scheduling method of claim 1, wherein the method is specifically:
21: storing the data packets to be forwarded by the central station into a sending queue of a scheduling buffer;
22: distributing sending channels for the data packets in the sending queue one by one;
23: and adjusting the direction of the transmitting channel antenna to the position of the subscriber station, and transmitting the data packet to the receiving subscriber station.
3. The SDM/SDMA central station transmit channel packet-by-packet scheduling method of claim 1, wherein said step 23 is further characterized by:
3.1, detecting a sending cache unit of the sending channel, reading a data packet to be sent, and if the sending cache unit is empty, continuing to detect;
3.2, analyzing the destination address of the data packet called from the sending cache unit;
3.3, according to the destination address of the data packet, inquiring a receiving time slot distribution table of a user station receiving the data packet, obtaining the starting moment t of the nearest idle time slot, if the value of t minus the current time is greater than the overtime H, discarding the data packet, and executing the step B3.9; if the value obtained by subtracting t from the current time value is more than or equal to P, setting t as the sending time, and marking the time slot starting at the time t of the user station as busy in a time slot allocation table; if the subtraction of T and the current time value is less than P, setting the T + kT time as the sending time, and marking the time slots of the subscriber station starting at the T, T + T, … and T + kT times as busy in the time slot allocation table;
3.4, packing the data packet into a burst frame to wait for transmission;
3.5, inquiring a user station geographical position information table according to the destination address of the data packet to acquire the geographical position information of the user station;
3.6, calculating the pointing parameters of the transmitting channel antenna according to the geographical position information of the user station acquired in the step 3.5;
3.7, according to the antenna pointing parameters calculated in the step 3.6, adjusting the pointing direction of the antenna of the sending channel to enable the signal beam to point to the position of the user station corresponding to the destination address in the step B3.2;
3.8, modulating, amplifying power and transmitting the burst frame in the step 3.4 at the transmitting time set in the step 3.3;
3.9, clearing the sending buffer unit and setting the working state of the sending channel to be idle;
3.10, repeating the steps 3.1 to 3.9;
wherein, the value of P is a set value, and the value of P is more than the time required for executing the steps 3.4 to 3.7; the timeout time H is a design value, and H is greater than P; the time slot length T is the time for transmitting 1 burst frame by the transmission channel; k is the smallest integer value that causes t + kT to be subtracted by more than P at the current time.
4. The SDM/SDMA central station transmit channel packet-by-packet scheduling method of claim 1, wherein said step 21 is further characterized by:
step B1.1, the central station receives a data packet which needs to be forwarded to the user station;
and step B1.2, the central station inserts the data packet into a sending queue of the scheduling buffer area according to a preset priority queuing strategy, queues for accessing a sending channel, and discards the data packet if the buffer area is full or the queue length reaches the maximum value.
5. The SDM/SDMA central station transmit channel packet-by-packet scheduling method of claim 1, wherein said step 22 is further characterized by:
b2.1, inquiring the working state of a sending channel, randomly selecting 1 channel with an idle state, and if all the channels are busy, continuing to inquire until the channel with the idle state appears;
b2.2, setting the state of the channel selected in the step B2.1 as busy;
b2.3, inquiring the sending queue, outputting the data packet at the front end of the queue to the sending buffer unit of the sending channel selected in the step B2.1, and if the sending queue is empty, continuing inquiring until a data packet waiting for sending exists in the queue;
and B2.4, repeating the steps B2.1, B2.2 and B2.3, and outputting the data packets in the sending queue to a sending buffer unit of the sending channel in sequence.
6. The SDM/SDMA central station transmit channel packet-by-packet scheduling method of claim 2, wherein the process of step 23 is performed in parallel for multiple processes.
7. The SDM/SDMA central station transmit channel packet-by-packet scheduling method of claim 1, wherein said central station stores a subscriber station geographical location information table containing the longitude, latitude, and altitude of the current location of all subscriber stations.
8. The SDM/SDMA central station transmit channel packet-by-packet scheduling method of claim 1, wherein said central station stores a table of all subscriber station receive slot assignments.
9. The SDM/SDMA central station transmit channel packet-by-packet scheduling method of claim 1, wherein each transmit channel transmitter and antenna configuration of the central station is the same, and wherein carrier center frequency, occupied bandwidth, and information rate are the same.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114465704A (en) * | 2022-03-15 | 2022-05-10 | 北京中科国信科技股份有限公司 | Multi-frequency space division MF-SDM/SDMA communication method with point beam antenna pointing and transmitting frequency adjusted packet by packet |
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| CN107547114A (en) * | 2016-06-27 | 2018-01-05 | 王毓晗 | Spot beam anternma points to the SDM/SDMA communication means packet-by-packet adjusted |
| CN110662233A (en) * | 2019-09-29 | 2020-01-07 | 中国电子科技集团公司第二十研究所 | Statistical priority multiple access system based on directional antenna receiving and transmitting and realization method |
| CN110996279A (en) * | 2019-12-16 | 2020-04-10 | 东南大学 | Multipath parallel transmission data scheduling method and system applied to unmanned aerial vehicle communication |
| WO2020088100A1 (en) * | 2018-10-31 | 2020-05-07 | 鹰视云(深圳)科技有限公司 | System and method for enhancing airspace coverage capability of mobile communication base station |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107547114A (en) * | 2016-06-27 | 2018-01-05 | 王毓晗 | Spot beam anternma points to the SDM/SDMA communication means packet-by-packet adjusted |
| WO2020088100A1 (en) * | 2018-10-31 | 2020-05-07 | 鹰视云(深圳)科技有限公司 | System and method for enhancing airspace coverage capability of mobile communication base station |
| CN110662233A (en) * | 2019-09-29 | 2020-01-07 | 中国电子科技集团公司第二十研究所 | Statistical priority multiple access system based on directional antenna receiving and transmitting and realization method |
| CN110996279A (en) * | 2019-12-16 | 2020-04-10 | 东南大学 | Multipath parallel transmission data scheduling method and system applied to unmanned aerial vehicle communication |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114465704A (en) * | 2022-03-15 | 2022-05-10 | 北京中科国信科技股份有限公司 | Multi-frequency space division MF-SDM/SDMA communication method with point beam antenna pointing and transmitting frequency adjusted packet by packet |
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