CN110875806A

CN110875806A - Ultra-high throughput wireless broadband data transmission method and system

Info

Publication number: CN110875806A
Application number: CN201811000477.4A
Authority: CN
Inventors: 南书志; 杨之佐; 刘慎发; 王凯; 鲍东山
Original assignee: Nufront Mobile Communications Tech Co Ltd
Current assignee: Nufront Mobile Communications Tech Co Ltd
Priority date: 2018-08-30
Filing date: 2018-08-30
Publication date: 2020-03-10

Abstract

The invention provides a wireless broadband data transmission method with ultrahigh throughput, which can perform fragment processing on data according to available channel resources and comprises the following steps: a sending end sends a plurality of data frames and/or fragment data according to the resources distributed by the channel; confirming the successfully received data frame and/or the sliced data according to the confirmation management frame fed back by the receiving end; retransmitting the unsuccessfully received data frame and/or the sliced data; and when the retransmission is carried out, the data frame and/or the fragment data are subjected to fragment processing again according to the current available resources. The channel resources can be used to the maximum extent and are not influenced by the fixed fragment size; the method can avoid a large number of fragmentations under the condition of sufficient resources, reduce the cost of wireless resources, reduce the processing time of a processor and reduce the overall cost; through immediate confirmation, the multiple transmission of the confirmed receiving fragments is avoided, and meanwhile, the network delay is effectively reduced.

Description

Ultra-high throughput wireless broadband data transmission method and system

Technical Field

The invention belongs to the technical field of wireless communication, and particularly relates to a method and a system for transmitting ultrahigh-throughput wireless broadband data.

Background

In network data transmission, fragmentation is beneficial for a network in which a network packet passes through a network with a Maximum Transmission Unit (MTU) that is smaller than the packet length. Under the condition that wireless channel fading, multipath fading and inter-channel interference are serious, the fragmented transmission is adopted, so that the retransmission of the whole frame of data caused by channel error codes can be avoided, and the overall transmission success rate of the data is improved. However, if the fragmentation is too small, there are more overheads such as packet header and fragmentation information, and the proportion of payload is small, which may cause waste of network resources. At present, network data fragmentation is generally performed according to a fixed size, and various network environments are adapted by adjusting the size of the fragmentation. The fragment mode generally adopts offset to position the data position, and the receiving end judges whether all fragment data are received after receiving the fragments and then synthesizes a whole packet. This approach has the following disadvantages:

firstly, the signaling overhead caused by fragmentation is large, the transmitting end indicates the fragmentation number in the data transmission process, and the receiving end confirms each fragmentation to cause large signaling overhead.

Secondly, the fragmentation size is fixed, and the resources of the wireless link are changing continuously. Therefore, setting a larger fragmentation threshold will cause a waste of radio resources at most equivalent to the fragmentation threshold, and setting a smaller fragmentation threshold will cause a larger signaling overhead. This contradiction is particularly prominent in wireless communication scenarios with high-speed movement. Two requirements are caused by rapid change of a wireless channel caused by high-speed movement, on one hand, in low signal-to-noise ratio, narrow bandwidth, low Modulation and Coding Scheme (MCS), and multi-user scenarios, because channel resources are limited, a smaller fragmentation design is required to improve the utilization rate of the wireless resources. On the other hand, at high snr, the need for high throughput requires a reduction of the signaling overhead due to fragmentation.

Thirdly, a large number of fragments can bring burden to a processor and storage, and the cost of equipment is increased.

And fourthly, the sender does not determine the receiving condition of the receiver in the sub-slice mode. Every retransmission needs to retransmit all fragments, wasting network bandwidth.

And fifthly, once the fragments are lost, the sender confirms the condition of needing retransmission, and the time delay is larger.

In order to solve the above problems, improve the utilization rate of wireless resources and reduce the signaling overhead caused by fragmentation, the present document proposes an immediate acknowledgement fragmentation data transmission scheme, which can utilize network resources to the maximum extent, and does not need to fragment all long frames into short frames, nor needs to retransmit all fragments every time, thereby achieving the maximum utilization rate of network resources and reducing the signaling overhead caused by fragmentation.

Disclosure of Invention

In view of the above, the technical problem to be solved by the present invention is to provide a method for transmitting wireless data with ultra-high throughput, wherein a fragmentation technical scheme employs a non-fixed fragmentation length and performs fragmentation based on the size of available wireless network data resources, so as to effectively reduce the number of fragments and maximally use network resources.

The invention provides a method for transmitting wireless broadband data with ultrahigh throughput, which can perform fragmentation processing on the data according to available channel resources and comprises the following steps:

a sending end sends a plurality of data frames and/or fragment data according to the resources distributed by the channel;

confirming the successfully received data frame and/or the sliced data according to the confirmation management frame fed back by the receiving end; retransmitting the unsuccessfully received data frame and/or the sliced data;

and when the retransmission is carried out, the data frame and/or the fragment data are subjected to fragment processing again according to the current available resources.

The sending end sending a plurality of data frames and/or fragmented data according to the resource allocated by the channel specifically includes:

the sending end sequentially takes out data from the data to be sent to judge whether the wireless resources are enough to send the data packet, and if the resources are enough, all the residual data of the data packet are sent; if not, the data packet is fragmented according to the current remaining wireless resource quantity, and the size of the fragmentation is equal to the current remaining wireless resource quantity.

Specifically, after receiving the data frame and/or the fragment data, the receiving end confirms through responding to a confirmation management frame; and the confirmation management frame is provided with an identification bit for indicating whether the confirmation opposite end successfully receives.

The invention also provides a wireless broadband data transmission system with ultra-high throughput, which can perform fragment processing on data according to available channel resources, and the system comprises:

the sending end is used for sending a plurality of data frames and/or fragment data according to the resources distributed by the channel;

the receiving end feeds back a confirmation management frame to the sending end for confirmation after receiving the data frame and/or the fragment data;

the sending end confirms the successfully received data frame and/or the sliced data according to the confirmation management frame fed back by the receiving end; retransmitting the unsuccessfully received data frame and/or the sliced data;

In summary, the method and system for transmitting ultra-high throughput wireless broadband data provided by the invention can perform fragmentation processing on data according to available channel resources, and compared with the prior art, the method and system can use the channel resources to the maximum extent and are not influenced by the fixed fragmentation size; the method can avoid a large number of fragmentations under the condition of sufficient resources, reduce the cost of wireless resources, reduce the processing time of a processor and reduce the overall cost; through immediate confirmation, the multiple transmission of the confirmed receiving fragments is avoided, and meanwhile, the network delay is effectively reduced.

For the purposes of the foregoing and related ends, the one or more embodiments include the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent from the following detailed description when considered in conjunction with the drawings and the disclosed embodiments are intended to include all such aspects and their equivalents.

Drawings

FIG. 1 is a diagram illustrating a packet format for transmission in an embodiment of the present invention;

FIG. 2 is a diagram of a frame body structure of an acknowledgment management frame fed back by a receiving end in an embodiment of the present invention;

FIG. 3 is a diagram illustrating a physical frame structure according to an embodiment of the present invention;

fig. 4a, 4b, 4c and 4d are schematic diagrams of a data transmission state according to an embodiment of the invention.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.

The invention provides a new fragmentation scheme, which does not fix the length of the fragmentation and carries out fragmentation according to the size of available wireless network data resources. The scheme adopts an immediate confirmation mode, and the sender can determine the data which is correctly received by the receiving end through immediate confirmation, so that the situation that the correct data is confirmed to be received by the receiving end is prevented from being meaninglessly retransmitted, and the length is adjusted in real time according to channel resources to maximally use network resources. Through immediate confirmation, the time delay can be reduced, and the network response time is improved.

In order to achieve the purpose of the present invention, the present invention provides an ultra-high throughput wireless broadband data transmission method, which can perform fragmentation processing on data according to available channel resources, and comprises:

In the present invention, the format of the transmitted data packet is shown in fig. 1.

The invention adds general MAC head and FCS check on the wireless network transmission data packet to form MAC Protocol Data Unit (MPDU), the frame format of MPDU is shown in figure 1. As shown in fig. 1, each MPDU may be divided into three portions.

The first part is a generic MAC header of fixed length.

The second portion is the payload carried by the MPDU.

The third part is check (FCS) information.

All the bits contained in the fields in the MAC frame are numbered from low to high and transmitted to the physical layer in the order from low to high. Bits within one byte are transferred to the physical layer in order from Left (LSB) to right (MSB). The bits contained in the same field correspond to decimal numbers such as b9-b 11-000 in the order of numbering from low to high, corresponding to 0; b9-b11 is 001, corresponding to 4.

The meaning of the fields of the generic MAC header is as follows:

A. frame control

The frame control includes protocol version, data flow information, frame type, etc.

B. Slice Number (FSN) field:

the fragment number field length is 4 bits, and is used for indicating the number of each fragment of the MPDU, and the value range is 0-15. When the MPDU has only one fragment, the fragment number is 0; when the MPDU has a plurality of slices, the first slice number thereof is 0. The slice numbers of different slices of the same MPDU are incremented by 1.

C. Sequence Number (SN) field

The sequence number field is 12 bits in length and ranges from 0 to 4095 to indicate the sequence number of the MPDU. All transmitted MPDUs within a data stream are assigned a sequence number. The first MPDU sequence number is 0 and the sequence numbers of different MPDUs are incremented by 1.

D. A fragment indication field:

the slice indication field is 1bit in length. In all data frames or sequence number management control frames, if fragments of the current MPDU exist later, the field is set to 1; otherwise, this field is set to 0.

E. Length field

The length field is 12 bits and represents the total byte length of all fields between the MAC header field and the FCS field.

The acknowledgement of the data packet is realized by a bitmap in the field of the acknowledgement management frame. The frame body structure of the ack management frame fed back by the receiving end is shown in fig. 2, where the set fields include: a Start Serial Number (SSN) bitmap for indicating which of the MPDUs or fragments have been successfully received by the receiving end.

The meaning of each field of the frame body of the acknowledgement management frame is shown in table 1.

Table 1 body description of acknowledgement management frame

The present invention defines a physical frame divided into a downlink period and an uplink period, and the structure of the physical frame is shown in fig. 3. In the downlink period, the CAP sends acknowledgement information DACK and downlink data of the uplink data to the STA, and in the uplink period, the STA sends acknowledgement information UACK and uplink data of the downlink data to the CAP. And multiple MPDUs can be received or sent in the uplink and downlink periods, and simultaneously, the multiple MPDUs are immediately confirmed through bitmaps in DACK or UACK. Because the uplink and downlink service data are independent, the party sending the service data is defined as a sending end, and the party receiving the service data is defined as a receiving end.

In the invention, the sending end needs to obtain the confirmation information of the last sending condition before sending each time. The transmitting end can transmit a plurality of whole frame data and/or fragment data according to the number of resources allocated to the channel. And the sending end sequentially takes out data from the data to be sent to judge whether the wireless resources are enough to send the data packet, and if the resources are enough, all the residual data of the data packet are sent. If not, the data packet is fragmented according to the current remaining wireless resource quantity, and the size of the fragmentation is equal to the current remaining wireless resource quantity.

And after receiving the MPDU/fragment data, the receiving end confirms through responding to the confirmation management frame. Every 1bit in the acknowledgement management frame Bitmap indicates whether a certain MPDU/fragment was successfully received. And the transmitting end confirms whether the opposite end successfully receives the data according to the bit information in the Bitmap.

For the fragment packets which are not received by the receiving end, the length of the fragment data packet does not need to be consistent with the length of the last time when the transmitting end retransmits the fragment packets again. In order to prevent the ACK loss, the receiving end needs to check whether the sequence number of the current fragmented data and the fragment number are consistent with the received sequence number and the received fragment number. If the coincidence indicates that the ACK replied before is lost, the current fragment is used to replace the last received fragment.

For the fragment packet received by the receiving end, the sending end sends the next fragment according to the position of the last fragment, and the size of the next fragment is related to the size of the currently acquired wireless channel resource. The transmitting end can fragment the same data packet for multiple times according to the change of the wireless channel, and the receiving end splices the complete data packet with the same serial number at the receiving end according to the fragment number.

For the whole packet which is not received by the receiving end, the transmitting end can perform fragmentation when retransmitting again, and the mechanism of the fragmentation is the same as that of the initial fragmentation, so that a plurality of fragments corresponding to the whole packet with different sequence numbers may need to be transmitted in one physical frame.

The same physical frame allows only one SN number to appear, but multiple packets of different SNs can be sent. Once the fragment request of the packet of service data is confirmed, the packet of service data is not sent according to the whole packet format.

Examples

If there are 4 packets of 1.5kB to be transmitted, the SN numbers of the packets are 1, 2, 3, and 4, respectively. Frame 1 is divided into 5kB of resources, and sends 1/2/3 SN whole packet data and 500-byte fragment with SN 4, assuming that receiving ACK as shown in fig. 4a, SN1/2 transmission failure requires retransmission.

If the resource of the 2 nd frame is 500 bytes, the SN1 data packet is preferentially sent. Since the available resources (or remaining resources) are only 500 bytes, the SN1 data is fragmented. Assume that the ACK received situation is as shown in fig. 4 b. SN1 fragment 0 is successfully transmitted, and the rest is waiting for the next frame to continue transmitting.

If the resource of the 3 rd frame is 1.5kB, the remaining fragment of the SN1 data packet and partial data of the SN2 are continuously sent, and it is assumed that receiving ACK is as shown in fig. 4c, transmission of the SN1 fragment 1 fails, and transmission of the SN2 fragment 0 succeeds.

If the resource of the 4 th frame is 3kB, the rest fragments of the SN1/2/4 data packet are sent, and if the ACK receiving situation is as shown in FIG. 4c, the SN1/2/4 fragments are successfully transmitted.

To this end all data transfers are completed.

Compared with the fixed fragmentation threshold scheme in the prior art, the invention has the following advantages:

1. can use the channel resource to the maximum extent and is not influenced by the fixed fragment size

2. The method can avoid a large number of fragmentations under the condition of sufficient resources, reduce the cost of wireless resources, reduce the processing time of a processor and reduce the overall cost

3. Through immediate confirmation, the multiple transmission of the confirmed receiving fragments is avoided, and meanwhile, the network delay is effectively reduced.

Those of skill in the art will understand that the various exemplary method steps and apparatus elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative steps and elements have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The steps of a method described in connection with the embodiments disclosed above may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a subscriber station. In the alternative, the processor and the storage medium may reside as discrete components in a subscriber station.

The disclosed embodiments are provided to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope or spirit of the invention. The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for transmitting ultra-high throughput wireless broadband data, which is characterized in that the data is processed by fragmentation according to available channel resources, comprises the following steps:

2. The method of claim 1, wherein the transmitting end specifically transmits a plurality of data frames and/or fragmented data according to the resource allocated by the channel comprises:

3. The method of claim 1, specifically comprising:

after receiving the data frame and/or the fragment data, the receiving end confirms the management frame through response confirmation; and the confirmation management frame is provided with an identification bit for indicating whether the confirmation opposite end successfully receives.

4. The method according to any one of claims 1 to 3,

the data frame is a MAC protocol data unit.

5. An ultra-high throughput wireless broadband data transmission system, wherein data is sliced according to available channel resources, the system comprising:

6. The system according to claim 5, wherein the transmitting end transmits a plurality of data frames and/or fragmented data according to the resource allocated by the channel specifically includes: