CN111082914B - OFDMA cross-carrier same-frequency full-duplex pairing method, terminal and storage medium - Google Patents

OFDMA cross-carrier same-frequency full-duplex pairing method, terminal and storage medium Download PDF

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CN111082914B
CN111082914B CN201911393977.3A CN201911393977A CN111082914B CN 111082914 B CN111082914 B CN 111082914B CN 201911393977 A CN201911393977 A CN 201911393977A CN 111082914 B CN111082914 B CN 111082914B
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pairing
sta
duplex
ofdma
frequency
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CN111082914A (en
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喻洪涛
吴伟民
梁芷馨
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Huazhong University of Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

Abstract

The invention belongs to the technical field of same-frequency full duplex, and discloses an OFDMA cross-carrier same-frequency full duplex pairing method and an OFDMA cross-carrier same-frequency full duplex pairing system, wherein the OFDMA cross-carrier same-frequency full duplex pairing method comprises the following steps: the AP firstly performs pairing learning at low frequency, and then performs AP full-duplex pairing at high frequency to realize a cross-carrier pairing mechanism; the AP realizes full-duplex OFDMA pairing at high frequency and simultaneously realizes an abnormal-frequency full-duplex mechanism of data and ACK. The invention divides the time into the period alternation of the learning phase and the pairing phase. The OFDMA cross-carrier same-frequency full-duplex pairing method provided by the invention can utilize large bandwidth, reasonably utilize spectrum holes, avoid the idle problem of spectrum and realize full duplex of data and ACK.

Description

OFDMA cross-carrier same-frequency full-duplex pairing method, terminal and storage medium
Technical Field
The invention belongs to the technical field of same-frequency full duplex, and particularly relates to an OFDMA cross-carrier same-frequency full duplex pairing method and application.
Background
Currently, the closest prior art: the same-frequency full-duplex technology enables wireless equipment to simultaneously use the same frequency band to receive and transmit wireless signals, the frequency spectrum utilization rate is improved by one time, beam forming is carried out through channel estimation to pair user full-duplex, not only is complex and time-frequency resources wasted, the 6G frequency band bandwidth is large, various different bandwidth devices coexist, STA measurement interference is complex, 2.4G interference measurement is simple, and the frame error and loss probability are lower, so that full-duplex pairing learning is carried out at 2.4G in the initial stage, and full-duplex pairing of an AP end is realized at 6G.
The next generation WIFI standards propose higher frequency bands (6G) and larger bandwidths (320M). In fact, the large bandwidth is difficult to be fully utilized, so that the idle frequency spectrum is caused, which is a great waste. Therefore, the full duplex of data and ACK is realized by reasonably utilizing the spectrum holes in the 6G frequency band.
In summary, the problems of the prior art are as follows: in the prior art, large bandwidth is difficult to be fully utilized, and frequency spectrum is easy to idle, so that the method is extremely waste. Resulting in inefficient use of the spectral data.
The difficulty of solving the technical problems is as follows: the WIFI standard is perfect and complex, and a new technical method is provided and needs to be compatible with the prior art; designing a cross-carrier learning and pairing process, a new action frame and a corresponding field of the AP;
the significance of solving the technical problems is as follows: the frequency spectrum resources are core resources for mobile communication development, a higher frequency band (6G) and a larger bandwidth (320M) are provided by the next generation of WIFI standard, the frequency spectrum resources can be more reasonably utilized by the new technical method, the frequency spectrum efficiency is improved, the throughput is improved, and the requirements of the next generation of WIFI are met.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an OFDMA cross-carrier same-frequency full-duplex pairing method and application.
The invention is realized in such a way that an OFDMA cross-carrier same-frequency full-duplex pairing method comprises the following steps:
firstly, the AP performs pairing learning at a low frequency, and then performs full-duplex pairing of the AP at a high frequency to realize a cross-carrier pairing mechanism.
And step two, the AP realizes full-duplex OFDMA pairing at high frequency and simultaneously realizes an abnormal frequency full-duplex mechanism of data and ACK.
Further, in the first step, the learning stage specifically includes:
firstly, the time is divided into a learning phase and a pairing phase which alternate periodically.
(1) In the initial learning phase, the AP is just powered on, the STA communicates with the AP at 2.4G, when the STA1 transmits uplink data, other STAs measure the RSSI of the STA1 uplink data, and record the MAC address of the received interference frame according to the measured RSSI > T result according to the set threshold T (the threshold may be set slightly higher than the normal interference level, because 6G interference is attenuated more quickly).
(2) The measurement result reporting may define a new action frame or a custom data frame, where the action frame is used.
(3) And finally, the AP sends action frames in sequence to inform the STA of reporting the measurement result, the measurement result is reported in an action frame format, and the AP determines whether to inform the STA to switch to 6G for pairing or not according to the RSSI of the data sent by the STA.
Further, the AP sequentially schedules the STA to report the interference measurement result through the action frame.
After the AP receives the action frames fed back by all STAs, the AP maintains an interference matrix M according to the result reported by each STA, the elements in the matrix are initialized to 1, and Mij being 1 indicates that uplink data of the STA i has interference on the STA j.
The AP judges which STA the interference belongs to according to the MAC address in the action frame reported by the STA, sets the corresponding element of the matrix to be 1, then screens the STA without the interference of the uplink data, and sets the corresponding element of the matrix to be 0.
Further, in the second step, the pairing process specifically includes:
(1) and the AP maintains a pairing matrix N according to the pairing condition in the pairing stage, the elements in the matrix are initialized to be 1, Nij equals to 1 to indicate that the uplink pairing of the STAi and the downlink pairing of the STAj are successful, and when Mij and Mji are not 1 and Nij is not 0, the uplink pairing of the STAi and the downlink pairing of the STAj can be performed.
(2) The AP sends downlink OFDMA data to a plurality of STAs in a 6G frequency band, and the frequency band is divided into a plurality of RUs and distributed to different STAs.
(3) And the AP selects a paired STA according to the interference matrix M and the pairing matrix N, and schedules the paired STA to occupy the same RU for uplink data transmission by sending a trigger frame in 6G, and if no paired STA exists, the paired STA singly occupies the RU for data transmission.
(4) The ACKs of the AP and the STA are transmitted in different frequency full duplex mode by reserving the RUs.
(5) The STA that failed the pairing attempts secondary pairing through power control.
Further, the pairing phase downlink comprises:
the HE-SIG-A field carries information necessary to interpret the HE PPDU, and the HE-SIG-B field encompasses allocation information of the user. The HE-SIG-B is divided into a common field and a user-specific field, and provides OFDMA and DL-MIMO resource allocation information by RU allocation subfield and user-specific field positions in the common field to allow respective STAs to use corresponding resources. The common field has an RU allocation subfield of 8XN bits, by which different values divide the channel into different RUs, while the user field corresponds in sequence to determine the different RUs acquired by different STAs.
Further, the pairing phase downlink further comprises:
the AP transmits downlink OFDMA data in a 6G frequency band, allocates RUs to different STAs through HE-SIG-B fields, and reserves a part of RUs as ACK reply channels of the STAs. The ACK for the STA is transmitted when the next group of users is paired.
Further, the pairing phase uplink comprises:
and the AP sends trigger frames in the 6G frequency band to schedule corresponding paired STAs to carry out uplink data transmission, corresponding RUs are distributed to the STAs through the trigger frames, and a part of RUs are reserved as ACK reply channels of the AP. And the AP replies MU-BA to the STA on the reserved channel while sending downlink data to the next group of users.
In the pairing stage, when the AP determines which STA has excessive uplink data interference according to the reception conditions of the downlink ACK and downlink data of the paired user STAi and STAj. If the downlink data of the STAj is received wrongly, the uplink data of the STAi is indicated to be interfered excessively, and the transmitting power of the STAi needs to be reduced; if the ACK reception of sta i is in error, the ACK transmit power of sta j needs to be reduced.
For uplink data power control, the AP indicates power when scheduling through trigger frames.
The transmission power of the STA is controlled by the Target RSSI field.
And if the pairing transmission is still failed again after the power is reduced, setting the corresponding element of the pairing matrix N to be 0.
Another object of the present invention is to provide an OFDMA cross-carrier same-frequency full-duplex pairing AP terminal of the OFDMA cross-carrier same-frequency full-duplex pairing method.
It is another object of the present invention to provide a computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface to implement the OFDMA cross-carrier same-frequency full-duplex pairing method when executed on an electronic device.
It is another object of the present invention to provide a computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the OFDMA cross-carrier same-frequency full-duplex pairing method.
In summary, the advantages and positive effects of the invention are: the OFDMA cross-carrier same-frequency full-duplex pairing method provided by the invention can utilize large bandwidth, reasonably utilize spectrum holes, avoid the idle problem of spectrum and realize full duplex of data and ACK.
Compared with the prior art, the method and the device can more reasonably utilize the spectrum resources, improve the spectrum efficiency, improve the throughput and meet the requirements of the next generation of WIFI.
Drawings
Fig. 1 is a flowchart of an OFDMA cross-carrier same-frequency full duplex pairing method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a RSSI measurement process provided in the embodiment of the present invention.
Fig. 3 is a schematic diagram of a 4G learning pairing phase provided in the embodiment of the present invention.
Fig. 4 is a schematic diagram of a 4G interference reporting process according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an Action frame format according to an embodiment of the present invention.
Fig. 6 is a diagram illustrating a new Action frame format according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of an RSSI reporting process according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of an interference matrix M according to an embodiment of the present invention.
Figure 9 is a schematic diagram of an OFDMA technique model provided by an embodiment of the present invention.
FIG. 10 is an exemplary timing diagram of the pairing phase according to the present invention.
Fig. 11 is a schematic diagram of an HE-SIG field according to an embodiment of the present invention.
Fig. 12 is a diagram illustrating downlink transmission timing for the pairing phase according to an embodiment of the invention.
Fig. 13 is a timing diagram of pairing phase uplink transmission according to an embodiment of the present invention.
Fig. 14 is a schematic diagram of a Trigger frame format according to an embodiment of the present invention.
FIG. 15 is a block diagram of a User Info field format according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the prior art, large bandwidth is difficult to be fully utilized, and frequency spectrum is easy to idle, so that the method is extremely waste.
In view of the problems in the prior art, the present invention provides an OFDMA cross-carrier same-frequency full-duplex pairing method and system, and the following describes the present invention in detail with reference to the accompanying drawings.
As shown in fig. 1, an OFDMA cross-carrier same-frequency full-duplex pairing method provided in the embodiment of the present invention includes the following steps:
s101: the AP firstly performs pairing learning at low frequency and then performs AP full-duplex pairing at high frequency to realize a cross-carrier pairing mechanism.
S102: the AP realizes full-duplex OFDMA pairing at high frequency and simultaneously realizes an abnormal-frequency full-duplex mechanism of data and ACK.
The present invention will be further described with reference to the following examples.
1. Learning phase
Firstly, the time is divided into a learning phase and a pairing phase which alternate periodically.
In the initial learning phase, the AP is just powered on, the STA communicates with the AP at 2.4G, when the STA1 transmits uplink data, other STAs measure the RSSI of the STA1 uplink data, and record the MAC address of the received interference frame according to the measured RSSI > T result according to the set threshold T (the threshold may be set slightly higher than the normal interference level, because 6G interference is attenuated more quickly). The RSSI measurement process is shown in fig. 2.
The measurement result reporting may define a new action frame or a custom data frame, where the action frame is used. The 4G learning pairing phase is shown in fig. 3.
And finally, the AP sends action frames in sequence to inform the STA of reporting the measurement result, the measurement result is reported in an action frame format, and the AP determines whether to inform the STA to switch to 6G for pairing or not according to the RSSI of the data sent by the STA. The 4G interference reporting process is shown in fig. 4.
And the AP sequentially schedules the STA to report the interference measurement result through the action frame. The format of the Action frame is shown in figure 5.
Among them, the category fields 32-126 are reserved fields, and select 32 to define a new action frame as the interference measurement reporting frame, where the action frame reported by the STA contains the MAC address of the interference frame detected in the learning stage, the format of the new action frame is shown in fig. 6, and the RSSI reporting process is shown in fig. 7.
After the AP receives the action frames fed back by all STAs, the AP maintains an interference matrix M according to the result reported by each STA, the elements in the matrix are initialized to 1, and Mij being 1 indicates that uplink data of the STA i has interference on the STA j.
The AP judges which STA the interference belongs to according to the MAC address in the action frame reported by the STA, sets the corresponding element of the matrix to be 1, then screens the STA without the interference of the uplink data, and sets the corresponding element of the matrix to be 0. The interference matrix M is shown in fig. 8.
5.2.2 pairing procedure
And the AP maintains a pairing matrix N according to the pairing condition in the pairing stage, the elements in the matrix are initialized to be 1, Nij equals to 1 to indicate that the uplink pairing of the STAi and the downlink pairing of the STAj are successful, and when Mij and Mji are not 1 and Nij is not 0, the uplink pairing of the STAi and the downlink pairing of the STAj can be performed.
The AP sends downlink OFDMA data to a plurality of STAs in a 6G frequency band, and the frequency band is divided into a plurality of RUs and distributed to different STAs.
And the AP selects a paired STA according to the interference matrix M and the pairing matrix N, and schedules the paired STA to occupy the same RU for uplink data transmission by sending a trigger frame in 6G, and if no paired STA exists, the paired STA singly occupies the RU for data transmission.
The ACKs of the AP and the STA are transmitted in different frequency full duplex mode by reserving the RUs.
The STA that failed the pairing attempts secondary pairing through power control. OFDMA technique model as shown in fig. 9, pairing phase timing diagram as shown in fig. 10.
Pairing stage downlink:
the HE-SIG-A field carries information necessary to interpret the HE PPDU, and the HE-SIG-B field encompasses allocation information of the user. The HE-SIG-B is divided into a common field and a user-specific field, and provides OFDMA and DL-MIMO resource allocation information by RU allocation subfield and user-specific field positions in the common field to allow respective STAs to use corresponding resources. The common field has an RU allocation subfield of 8XN bits, by which different values divide the channel into different RUs, while the user field corresponds in sequence to determine the different RUs acquired by different STAs. The HE-SIG field is shown in fig. 11.
Pairing stage downlink:
the AP transmits downlink OFDMA data in a 6G frequency band, allocates RUs to different STAs through HE-SIG-B fields, and reserves a part of RUs as ACK reply channels of the STAs. The ACK for the STA is transmitted when the next group of users is paired. Pairing phase downlink transmission timing diagrams are shown, for example, in fig. 12.
Pairing phase uplink:
and the AP sends trigger frames in the 6G frequency band to schedule corresponding paired STAs to carry out uplink data transmission, corresponding RUs are distributed to the STAs through the trigger frames, and a part of RUs are reserved as ACK reply channels of the AP. And the AP replies MU-BA to the STA on the reserved channel while sending downlink data to the next group of users. Pairing phase uplink transmission timing diagrams are shown in fig. 13.
In the pairing stage, when the AP determines which STA has excessive uplink data interference according to the reception conditions of the downlink ACK and downlink data of the paired user STAi and STAj. If the downlink data of the STAj is received wrongly, the uplink data of the STAi is indicated to be interfered excessively, and the transmitting power of the STAi needs to be reduced; if the ACK reception of sta i is in error, the ACK transmit power of sta j needs to be reduced.
For uplink data power control, the AP indicates power when scheduling through trigger frames, the format of the trigger frames is shown in fig. 14, wherein the format of the User Info field is shown in fig. 15.
The transmission power of the STA is controlled by the Target RSSI field.
And if the pairing transmission is still failed again after the power is reduced, setting the corresponding element of the pairing matrix N to be 0.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When used in whole or in part, can be implemented in a computer program product that includes one or more computer instructions. When loaded or executed on a computer, cause the flow or functions according to embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.)). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. An OFDMA cross-carrier same-frequency full-duplex pairing method is characterized by comprising the following steps:
firstly, AP performs pairing learning at low frequency and then performs full duplex pairing at high frequency to realize a cross-carrier pairing mechanism;
the learning phase comprises:
(1) dividing the time into a learning stage and a pairing stage which are periodically alternated; in the initial learning stage, the AP is just started, the STA communicates with the AP at 2.4G, when the STA1 sends uplink data, other STAs measure the RSSI of the uplink data of the STA1, and according to a set threshold value T, the MAC address of the received interference frame is recorded according to the measurement result that the RSSI is greater than T;
(2) reporting the measurement result by adopting an action frame or a data frame;
(3) the AP sends action frames in sequence to inform the STA to report a measurement result, the measurement result is reported in an action frame format, and the AP determines whether to inform the STA to switch to 6G for pairing or not according to the RSSI of data sent by the STA;
secondly, the AP performs full-duplex OFDMA pairing at high frequency and performs an different-frequency full-duplex mechanism of data and ACK;
the pairing process specifically includes:
(1) the AP maintains a pairing matrix N according to the pairing condition in the pairing stage, elements in the matrix are initialized to be 1, Nij equals 1 to indicate that the uplink pairing of the STAi and the downlink pairing of the STAj are successful, and when Mij and Mji are not 1 and Nij is not 0, the uplink pairing of the STAi and the downlink pairing of the STAj can be performed;
(2) the AP sends downlink OFDMA data to a plurality of STAs in a 6G frequency band, divides the frequency band into a plurality of RUs and distributes the RUs to different STAs;
(3) the AP selects a paired STA according to the interference matrix M and the pairing matrix N, the paired STA is scheduled to occupy the same RU for uplink data transmission by sending a trigger frame in 6G, and if no paired STA exists, the paired STA independently occupies the RU for data transmission;
(4) ACK of the AP and the STA is transmitted in an inter-frequency full duplex mode through a reserved RU;
(5) the STA that failed the pairing attempts secondary pairing through power control.
2. The OFDMA cross-carrier same-frequency full-duplex pairing method of claim 1, wherein the AP sequentially schedules STAs through action frames to report interference measurement results through the action frames;
after the AP receives action frames fed back by all the STAs, the AP maintains an interference matrix M according to a result reported by each STA, elements in the matrix are initialized to 1, and Mij is 1 to represent the interference of uplink data of the STAi to the STAj;
the AP judges which STA the interference belongs to according to the MAC address in the action frame reported by the STA, sets the corresponding element of the matrix to be 1, then screens the STA without the interference of the uplink data, and sets the corresponding element of the matrix to be 0.
3. The OFDMA cross-carrier same-frequency full-duplex pairing method of claim 1, wherein the pairing stage downlink comprises:
the HE-SIG-A field carries information necessary for explaining HE PPDU, and the HE-SIG-B field contains allocation information; the HE-SIG-B is divided into a common field and a user-specific field, and OFDMA and DL-MIMO resource allocation information is provided by RU allocation subfields and positions of the specific fields in the common field to allow respective STAs to use corresponding resources; the common field has an RU allocation subfield of 8XN bits by which different values divide the channel into different RUs, while the fields sequentially correspond to determine the different RUs that different STAs obtain.
4. The OFDMA cross-carrier same-frequency full-duplex pairing method of claim 3, wherein the pairing stage downlink further comprises:
the AP sends downlink OFDMA data in a 6G frequency band, RUs are distributed to different STAs through HE-SIG-B fields, and a part of RUs are reserved to be used as ACK reply channels of the STAs; the ACK for the STA is transmitted at the time of the next set pairing.
5. The OFDMA cross-carrier same-frequency full-duplex pairing method of claim 1, wherein the pairing stage uplink comprises:
the AP sends trigger frames in the 6G frequency band to schedule corresponding paired STAs to carry out uplink data transmission, corresponding RUs are distributed to the STAs through the trigger frames, and a part of RUs are reserved as ACK reply channels of the AP; the AP replies MU-BA to the STA on a reserved channel while sending downlink data to the next group;
in the pairing stage, when the AP judges which STA has excessive uplink data interference according to the receiving conditions of the downlink ACK of the paired user STAi and the downlink data of the STAj; if the downlink data of the STAj is received wrongly, the uplink data of the STAi is indicated to be interfered excessively, and the transmitting power of the STAi needs to be reduced; if the ACK reception of the STAi is wrong, the ACK transmission power of the STAj needs to be reduced;
for uplink data power control, the AP indicates power when scheduling through a trigger frame; controlling the transmitting power of the STA through a Target RSSI field; and if the pairing transmission is still failed again after the power is reduced, setting the corresponding element of the pairing matrix N to be 0.
6. An OFDMA cross-carrier same-frequency full-duplex pairing AP terminal according to the OFDMA cross-carrier same-frequency full-duplex pairing method of any one of claims 1 to 5.
7. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the OFDMA cross-carrier same-frequency full-duplex pairing method of any one of claims 1-5.
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CN109412711A (en) * 2018-10-29 2019-03-01 展讯通信（上海）有限公司 The matching method and device of full-duplex communication, terminal in asymmetric band

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