CN112654096A - Adaptive adjustment method and device for length of contention window - Google Patents
Adaptive adjustment method and device for length of contention window Download PDFInfo
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- CN112654096A CN112654096A CN201910965128.4A CN201910965128A CN112654096A CN 112654096 A CN112654096 A CN 112654096A CN 201910965128 A CN201910965128 A CN 201910965128A CN 112654096 A CN112654096 A CN 112654096A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
Abstract
The embodiment of the invention provides a method and a device for adaptively adjusting the length of a contention window. The method comprises the following steps: calculating the ratio r of NACKs in all CBG-ACKs in a transport blockNACK(ii) a According to the rNACKDetermining a virtual TB-ACK of the transport block, wherein the virtual TB-ACK is response feedback of a user based on CBG feedback; determining the proportion of final NACK according to the number of the virtual TB-ACK NACKs and the number of HARQ-ACK NACKs, wherein the HARQ-ACK is response feedback of a user based on TB feedback; and adjusting the length of a contention window according to the final NACK proportion. The embodiment of the invention can realize the feedback adjustment of the length of the competition window based on the CBG in the NR-U system, and the competition window and the LAA system are in fair coexistence, thereby providing more accurate evaluation for collision.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for adaptively adjusting a length of a contention window.
Background
With the development of mobile internet, the existing network capacity has been unable to meet the rapidly increasing data traffic service demand. LAA (Licensed Assisted Access) deploys LTE (Long Term Evolution) in an unlicensed frequency band by using a carrier aggregation technology, thereby effectively expanding the cellular network capacity. With the increasing demand of 5G applications, the fact that spectrum resources are crowded is a necessary result, especially licensed spectrum resources are scarce, and cannot meet the development requirement of future wireless communication, and the research of 5G unlicensed spectrum utilization technology has already been scaled.
In the LTE unlicensed spectrum system, when data transmission needs to be performed on an unlicensed spectrum, idle channel estimation detection needs to be performed on the channel first. If the channel is detected to be in an idle state, the channel can be occupied and data can be transmitted on the channel, but the transmission time cannot exceed the maximum channel occupation time; the channel detection mechanism mainly comprises two types, namely a frame structure-based channel detection mechanism and a load-based channel detection mechanism. LAA uses a channel detection mechanism based on load, and there are two kinds of adjustment schemes for Contention Window Size (CWS): a fixed CWS contention window length random backoff mechanism, a dynamic CWS contention window length random backoff mechanism. In LTE unlicensed spectrum, the LBT (Listen Before Talk) mechanism used for sending data is a dynamic CWS contention window length random backoff mechanism.
In the LTE unlicensed spectrum system, the adjustment of the CWS is determined based on a NACK ratio fed back by Hybrid Automatic Repeat reQuest (HARQ) Acknowledgements (ACKs) of all data transmitted by a base station in a reference subframe, where HARQ is fed back based on Transport Blocks (TBs), that is, one TB feeds back one HARQ-ACK, and in NR, each TB may be divided into multiple Code Block Groups (CBGs), where both HARQ-ACK and retransmission may be in units of CBGs or TBs. How to adjust the CWS based on HARQ-ACK feedback of CBG, there is currently no adjustment method and conclusion specified by the protocol.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for adaptively adjusting the length of a contention window.
The embodiment of the invention provides a method for adaptively adjusting the length of a contention window, which comprises the following steps:
calculating the ratio r of NACKs in all CBG-ACKs in a transport blockNACK；
According to the rNACKDetermining a virtual TB-ACK of the transport block, wherein the virtual TB-ACK is response feedback of a user based on CBG feedback;
determining the proportion of final NACK according to the number of the virtual TB-ACK NACKs and the number of HARQ-ACK NACKs, wherein the HARQ-ACK is response feedback of a user based on TB feedback;
and adjusting the length of a contention window according to the final NACK proportion.
The embodiment of the invention provides a device for adaptively adjusting the length of a contention window, which comprises:
a calculation unit for calculating the ratio r of NACKs in all CBG-ACKs in a transport blockNACK；
A first determination unit for determining rNACKDetermining a virtual TB-ACK of the transport block, wherein the virtual TB-ACK is response feedback of a user based on CBG feedback;
a second determining unit, configured to determine a final NACK ratio according to the number of NACKs of the virtual TB-ACKs and the number of NACKs of HARQ-ACKs, where the HARQ-ACKs are response feedback of users based on TB feedback;
and the adjusting unit is used for adjusting the length of the contention window according to the final NACK proportion.
The embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the processor implements the contention window length adaptive adjustment method.
An embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the contention window length adaptive adjustment method described above.
According to the method and the device for adaptively adjusting the length of the contention window, provided by the embodiment of the invention, the virtual TB-ACK of the TB is determined for the user based on the CBG feedback, and then the final NACK proportion is calculated together with the HARQ-ACK of the user fed back by the TB, so that the feedback adjustment of the length of the contention window based on the CBG in the NR-U system can be realized, and the method and the device can be fairly coexisted with the LAA system, and more accurate evaluation is provided for collision.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of random backoff of a dynamic contention window size in an LTE unlicensed spectrum system in the prior art;
fig. 2 is a schematic flowchart of a contention window length adaptive adjustment method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a CBG provided in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a contention window length adaptive adjustment apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Before explaining the embodiments of the present invention in detail, an LBT mechanism principle that a dynamic CWS contention window length random backoff mechanism is adopted in an LTE unlicensed spectrum system is introduced first: firstly, detecting whether a channel is idle at a first time granularity, and if the channel is idle, determining a Contention Window Size (CWS). Then, a random number N is taken between 0 and CWS, whether the channel is idle is detected according to second time granularity, and if the channel is idle, the random number N is reduced by 1; otherwise, detecting whether the channel is idle by using the first time granularity, if the channel is idle, subtracting 1 from the random number N, converting to detect whether the channel is idle by using the second time granularity, and continuing, when the random number N is subtracted to be 0, indicating that the channel is idle, starting to occupy the channel, and after the maximum channel occupation time is finished, needing to perform channel detection again.
As can be seen from the above detection process, the value range of the random number N is determined by the size of the CWS, and different parameters are provided for different channel access priorities. Different channel access priorities, the selectable values of CWS are different. Wherein, when accessing the channel for the first time, selecting the minimum value of the CWS; when the channel is idle for the first detection and after the maximum channel occupation time is over, the value of the CWS during the second channel detection needs to be determined according to the reception error rate of data transmission in one subframe (reference subframe) of the first channel occupation time, which is a dynamic CWS contention window length random backoff mechanism adopted by the LAA. More specifically, the adjustment of the CWS is determined based on a NACK ratio of Hybrid Automatic Repeat reQuest (HARQ) Acknowledgement (ACK) feedback of all data transmitted by the base station within the reference subframe. For example, if the NACK proportion of all data transmitted by the base station in the reference subframe reaches 80% or more, which indicates that the channel condition is poor, the CWS value is increased, otherwise, the CWS value is kept unchanged. After the CWS value is increased to a maximum and maintained for a maximum number of times, the CWS is reset to a minimum value.
Fig. 1 shows a diagram of random backoff of a dynamic contention window size in a LTE unlicensed spectrum system in the prior art.
As shown in fig. 1, the CWS corresponding to the first downlink PDSCH transmission is 15, and the user cannot successfully receive the PDSCH during the first downlink transmission, so the base station increases the CWS value to CWS 31 according to the wrong reception status, and generates the random number N and performs channel sensing using the increased CWS before the second downlink PDSCH transmission.
Fig. 2 is a flowchart illustrating a contention window length adaptive adjustment method according to an embodiment of the present invention.
As shown in fig. 2, the method specifically includes the following steps:
s21, calculating the NACK proportion r in all CBG-ACKs in the transmission blockNACK；
Specifically, fig. 3 shows a schematic diagram of CBG, in NR, each TB may be divided into multiple code block groups CBG, where HARQ-ACK and retransmission may be in units of CBG or TB.
For a user using CBG as a retransmission unit, the embodiment of the present invention first calculates the NACK ratio in all CBG-ACKs of the same TB.
S22, according to the rNACKDetermining a virtual TB-ACK of the transport block, wherein the virtual TB-ACK is response feedback of a user based on CBG feedback;
in particular, according to said rNACKAnd obtaining the virtual TB-ACK of the TB block through certain conversion, wherein the virtual TB-ACK is response feedback of a user with the CBG as a retransmission unit, and the TB-ACK can be ACK or NACK.
S23, determining the proportion of final NACK according to the number of NACK of the virtual TB-ACK and the number of NACK of HARQ-ACK, wherein the HARQ-ACK is based on response feedback of a user fed back by the TB;
specifically, since HARQ-ACK and retransmission can be in units of CBG or TB, response feedback and retransmission of some users are based on CBG, response feedback and retransmission of some users are based on TB, the number of virtual TB-ACKs as NACKs is determined for users based on TB feedback, the number of HARQ-ACKs as NACKs is determined for users based on TB feedback, and the ratio of final NACKs is determined according to the number of virtual TB-ACKs as NACKs and the number of HARQ-ACKs as NACKs.
And S24, adjusting the length of the contention window according to the final NACK proportion.
Specifically, the ratio of the final NACK calculated by the virtual TB-ACK of the TB block together with the HARQ-ACK of the UE configured to feed back the TB-ACK (if any) is applied to the adjustment of the contention window length CWS. By the operation, the method can adopt consistent adjustment behavior with the existing LTE LAA system, can ensure fair coexistence with the LAA system under the condition of collision, and provides more accurate evaluation for collision together.
According to the adaptive adjustment method for the length of the contention window, provided by the embodiment of the invention, the virtual TB-ACK of the TB is determined for the user based on the CBG feedback, and then the final NACK proportion is calculated together with the HARQ-ACK of the user fed back by the TB, so that the feedback adjustment of the length of the contention window based on the CBG in the NR-U system can be realized, and the adaptive adjustment method is in fair coexistence with the LAA system, and provides more accurate evaluation for collision.
On the basis of the foregoing embodiment, step S22 specifically includes:
if said rNACKIf the value is larger than or equal to a first threshold value, determining the virtual TB-ACK to be NACK;
if said rNACKAnd if the value is less than the first threshold value, determining the virtual TB-ACK to be ACK.
Specifically, the NACK proportion in all CBG-ACKs of the same TB is compared with a set threshold L, and if not lower than the threshold L, the virtual TB-ACK is NACK, otherwise, it is ACK.
On the basis of the above embodiment, the method further includes: and configuring the first threshold according to the service priority.
Specifically, the decision threshold may be configured according to the service priority. For higher priority traffic, a higher value may be set to ensure a higher fault tolerance rate, so that the CWS is maintained at a smaller value to obtain more transmission opportunities. The service with lower priority can be set with a lower value, so that the fault tolerance rate is not high, and the CWS is more easily triggered to be doubled, thereby reducing the competition for resources.
The embodiment of the invention configures different judgment threshold values for services with different priorities, and makes full use of the flexibility of CBG-ACK feedback, so that the adjustment of the CWS of the NR-U is more flexible and detailed.
On the basis of the foregoing embodiment, step S24 specifically includes:
and if the final NACK ratio is larger than or equal to a second threshold value, increasing the length of the current contention window to a preset value.
Specifically, the final NACK ratio determines the adjustment of the CWS, for example, if the final NACK reaches 80% or more, which indicates poor channel condition, the CWS value is increased, otherwise, it remains unchanged.
On the basis of the above-described embodiments, rNACK＝gNACK/g
Wherein g is the number of CBGs contained in the transport block, gNACKAnd feeding back the number of CBGs with NACK in the transmission block.
Specifically, if the number of CBGs included in one TB is g, the number of CBGs to which NACK is fed back is gNACKThen calculate the ratio of NACK in all CBG-ACKs of the same TB as rNACK＝gNACK/g。
Fig. 4 shows a schematic structural diagram of a contention window length adaptive adjustment apparatus provided in an embodiment of the present invention.
As shown in fig. 4, the apparatus includes: a calculation unit 41, a first determination unit 42, a second determination unit 43 and an adjustment unit 44, wherein:
the calculating unit 41 is configured to calculate a ratio r of NACKs in all CBG-ACKs in a transport blockNACK；
The first determining unit 42 is configured to determine r according toNACKDetermining a virtual TB-ACK of the transport block, wherein the virtual TB-ACK is response feedback of a user based on CBG feedback;
the second determining unit 43 is configured to determine a final NACK ratio according to the number of virtual TBs-ACKs being NACKs and the number of HARQ-ACKs being NACKs, where the HARQ-ACK is response feedback of a user based on TB feedback;
the adjusting unit 44 is configured to adjust the length of the contention window according to the final NACK ratio.
The device for adaptively adjusting the length of the contention window provided by the embodiment of the invention can realize the feedback adjustment of the length of the contention window based on the CBG in the NR-U system by determining the virtual TB-ACK of the TB for the user fed back based on the CBG and then calculating the final NACK proportion together with the HARQ-ACK of the user fed back by the TB, and can be fairly coexisted with the LAA system, thereby providing more accurate evaluation for collision.
On the basis of the foregoing embodiment, the first determining unit 42 is specifically configured to:
if said rNACKIs greater than or equal to a first threshold value,determining the virtual TB-ACK to be NACK;
if said rNACKAnd if the value is less than the first threshold value, determining the virtual TB-ACK to be ACK.
On the basis of the above embodiment, the apparatus further includes:
and the configuration unit is used for configuring the first threshold according to the service priority.
On the basis of the foregoing embodiment, the adjusting unit 44 is specifically configured to increase the length of the current contention window to a preset value if the ratio of the final NACK is greater than or equal to a second threshold.
On the basis of the above-described embodiments, rNACK＝gNACKG, wherein g is the number of CBGs contained in the transport block, gNACKAnd feeding back the number of CBGs with NACK in the transmission block.
The contention window length adaptive adjustment apparatus described in this embodiment may be used to implement the method embodiments described above, and the principle and technical effect are similar, which are not described herein again.
Fig. 5 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 5: a processor (processor)51, a communication Interface (communication Interface)52, a memory (memory)53 and a communication bus 54, wherein the processor 51, the communication Interface 52 and the memory 53 complete communication with each other through the communication bus 54. The processor 51 may call logic instructions in the memory 53 to perform the methods provided by the various embodiments described above.
In addition, the logic instructions in the memory 53 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented by a processor to execute the methods provided in the foregoing embodiments.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A contention window length adaptive adjustment method is characterized in that the method comprises the following steps:
calculating the ratio r of NACKs in all CBG-ACKs in a transport blockNACK；
According to the rNACKDetermining a virtual TB-ACK of the transport block, wherein the virtual TB-ACK is response feedback of a user based on CBG feedback;
determining the proportion of final NACK according to the number of the virtual TB-ACK NACKs and the number of HARQ-ACK NACKs, wherein the HARQ-ACK is response feedback of a user based on TB feedback;
and adjusting the length of a contention window according to the final NACK proportion.
2. The adaptive contention window length adjustment method according to claim 1, wherein the r is a function of the length of the contention windowNACKDetermining the virtual TB-ACK of the transport block comprises:
if said rNACKIf the value is larger than or equal to a first threshold value, determining the virtual TB-ACK to be NACK;
if said rNACKAnd if the value is less than the first threshold value, determining the virtual TB-ACK to be ACK.
3. The adaptive contention window length adjustment method according to claim 1, further comprising: and configuring the first threshold according to the service priority.
4. The adaptive contention window length adjusting method according to claim 1, wherein the adjusting the contention window length according to the final NACK ratio comprises:
and if the final NACK ratio is larger than or equal to a second threshold value, increasing the length of the current contention window to a preset value.
5. The adaptive contention window length adjustment method according to claim 1,
rNACK＝gNACK/g
wherein g is the number of CBGs contained in the transport block, gNACKAnd feeding back the number of CBGs with NACK in the transmission block.
6. An apparatus for adaptively adjusting a contention window length, the apparatus comprising:
a calculation unit for calculating the ratio r of NACKs in all CBG-ACKs in a transport blockNACK；
A first determination unit for determining rNACKDetermining a virtual TB-ACK of the transport block, wherein the virtual TB-ACK is response feedback of a user based on CBG feedback;
a second determining unit, configured to determine a final NACK ratio according to the number of NACKs of the virtual TB-ACKs and the number of NACKs of HARQ-ACKs, where the HARQ-ACKs are response feedback of users based on TB feedback;
and the adjusting unit is used for adjusting the length of the contention window according to the final NACK proportion.
7. The adaptive contention window length adjusting apparatus according to claim 6, wherein the first determining unit is configured to:
if said rNACKIf the value is larger than or equal to a first threshold value, determining the virtual TB-ACK to be NACK;
if said rNACKAnd if the value is less than the first threshold value, determining the virtual TB-ACK to be ACK.
8. The apparatus of claim 6, wherein the adjusting unit is configured to increase the current contention window length to a preset value if the final NACK ratio is greater than or equal to a second threshold.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the contention window length adaptive adjustment method according to any one of claims 1 to 5 when executing the program.
10. A non-transitory computer readable storage medium, having stored thereon a computer program, wherein the computer program, when being executed by a processor, implements the steps of the contention window length adaptive adjustment method according to any one of claims 1 to 5.
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