CN110944396B - Competition window size adjusting method and network equipment - Google Patents
Competition window size adjusting method and network equipment Download PDFInfo
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- CN110944396B CN110944396B CN201811115526.9A CN201811115526A CN110944396B CN 110944396 B CN110944396 B CN 110944396B CN 201811115526 A CN201811115526 A CN 201811115526A CN 110944396 B CN110944396 B CN 110944396B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- 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
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- 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 signalling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The embodiment of the invention discloses a CWS adjusting method and network equipment in unlicensed spectrum transmission, which are used for adjusting CWS in a broadband operation scene. The method comprises the following steps: receiving a plurality of HARQ replies, wherein the downlink channels corresponding to the plurality of HARQ replies occupy one or more basic bandwidths in a reference time unit; determining the HARQ response quantity of a basic bandwidth; and adjusting the CWS corresponding to the one basic bandwidth based on the NACK ratio in the one basic bandwidth.
Description
Technical Field
The present disclosure relates to the field of communications, and in particular, to a contention window size (Contention Window Size, CWS) adjustment method and a network device.
Background
The terminal device generally needs to feed back a hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) acknowledgement after receiving the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH), where the HARQ acknowledgement includes an acknowledgement (ACKnowledgement, ACK) and a Negative acknowledgement (Negative-ACKnowledgment, NACK) and so on. Thus, the network equipment can acquire the receiving condition of the terminal equipment according to the received HARQ response; meanwhile, the network device can also adjust the CWS according to the ratio of NACK in the HARQ response.
The New Radio or New air interface (NR) supports wideband operation greater than 20M, specifically, for example, the network device may schedule multiple basic bandwidths for the terminal device at present, but at the next moment, the network device still listens (Listen Before Talk, LBT) before talking on a unit basis of each basic bandwidth, so the network device needs to adjust the CWS corresponding to each basic bandwidth when scheduling multiple basic bandwidths. However, the related art does not provide a solution for adjusting the CWS in a broadband operation scenario. Therefore, how to adjust the CWS in a broadband operation scenario is a technical problem that needs to be solved in the prior art.
Disclosure of Invention
An objective of the embodiments of the present invention is to provide a CWS adjustment method in unlicensed spectrum transmission, which is used for adjusting CWS in a broadband operation scenario.
In a first aspect, there is provided a method for CWS adjustment in unlicensed spectrum transmission, the method being performed by a network device, the method comprising: receiving a plurality of HARQ replies, wherein the downlink channels corresponding to the plurality of HARQ replies occupy one or more basic bandwidths in a reference time unit; determining the HARQ response quantity of a basic bandwidth; and adjusting the CWS corresponding to the one basic bandwidth based on the NACK ratio in the one basic bandwidth.
In a second aspect, there is provided a network device comprising: a receiving module, configured to receive a plurality of HARQ acknowledgements, where a downlink channel corresponding to the plurality of HARQ acknowledgements occupies one or more basic bandwidths in a reference time unit; a quantity determining module, configured to determine a number of HARQ acknowledgements for a basic bandwidth; and the CWS adjusting module is used for adjusting the CWS corresponding to the one basic bandwidth based on the NACK ratio in the one basic bandwidth.
In a third aspect, there is provided a network device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the steps of the CWS adjustment method in unlicensed spectrum transmission according to the first aspect.
In a fourth aspect, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the CWS adjustment method in unlicensed spectrum transmission according to the first aspect.
In the embodiment of the invention, when the network equipment receives a plurality of HARQ replies, the network equipment can determine the number of the HARQ replies of the basic bandwidth and adjust the CWS based on the NACK ratio in the basic bandwidth, thereby solving the problem of adjusting the CWS in a broadband operation scene and being beneficial to improving the utilization efficiency of an unlicensed frequency band.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a schematic flow diagram of a CWS adjustment method in unlicensed spectrum transmission according to one embodiment of the present invention;
fig. 2 is a schematic flow chart of a CWS adjustment method in unlicensed spectrum transmission according to another embodiment of the present invention;
fig. 3 is a diagram illustrating multiple basic bandwidths occupied by a PDSCH according to an embodiment of the invention;
fig. 4 is a schematic flow chart of a CWS adjustment method in unlicensed spectrum transmission according to yet another embodiment of the present invention;
fig. 5 is a schematic flow chart of a CWS adjustment method in unlicensed spectrum transmission according to yet another embodiment of the present invention;
fig. 6 is a schematic flow chart of a CWS adjustment method in unlicensed spectrum transmission according to a further embodiment of the present invention;
fig. 7 is a schematic diagram of a network device according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of a network device according to another embodiment of the present invention.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be understood that the technical solution of the embodiment of the present invention may be applied to various communication systems, for example: global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, general packet Radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (Frequency Division Duplex, FDD) system, LTE time division duplex (Time Division Duplex, TDD), universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS) or worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, wiMAX) communication system, 5G system, or New Radio, NR) system, or a subsequent evolution communication system.
In an embodiment of the present invention, the Terminal device may include, but is not limited to, a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), a Mobile phone (Mobile phone), a User Equipment (UE), a handset (handset), a portable device (portable Equipment), a vehicle (vehicle), and the like, and may communicate with one or more core networks via a radio access network (Radio Access Network, RAN), for example, the Terminal device may be a Mobile phone (or referred to as a "cellular" phone), a computer with a wireless communication function, and the like, and the Terminal device may also be a portable, pocket, hand-held, computer-built-in, or vehicle-mounted Mobile device.
In the embodiment of the invention, the network equipment is a device which is deployed in the wireless access network and used for providing a wireless communication function for the terminal equipment. The network device may be a base station, which may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems employing different radio access technologies, the names of devices with base station functionality may vary. For example, in LTE networks, referred to as Evolved nodebs (enbs or enodebs), in third generation (3rd Generation,3G) networks, referred to as Node bs (Node bs), or network devices in subsequent Evolved communication systems, etc., although the term is not limiting.
In unlicensed spectrum transmission, a network device can simultaneously schedule multiple basic bandwidths to improve transmission efficiency. In the prior art, since it is not known to which basic bandwidth the HARQ response fed back by the terminal device should be allocated, the CWS cannot be adjusted based on the NACK ratio adjustment in the basic bandwidth.
To solve the above-mentioned technical problem, as shown in fig. 1, an embodiment of the present invention provides a CWS adjustment method 100 in unlicensed (un-license) spectrum transmission, for adjusting CWS in a broadband operation scenario, where the method embodiment 100 may be executed by a network device, and includes the following steps:
s102: and receiving a plurality of HARQ replies, wherein the downlink channels corresponding to the plurality of HARQ replies occupy one and/or a plurality of basic bandwidths in the reference time unit.
The plurality of HARQ acknowledgements are transmitted by the terminal device based on received downlink channels, where the downlink channels include, for example: a physical downlink control CHannel (Physical Downlink Control chnnel, PDCCH), a physical downlink shared CHannel (Physical Downlink Shared chnnel, PDSCH), and the like.
Before step S102, the network device may send downlink channels in the reference time unit for different terminal devices, so that the terminal device may feedback HARQ response after receiving the downlink channels, to inform the network device whether the downlink channels are received correctly, and assist the network device in determining whether subsequent retransmission is needed, and so on.
The plurality of HARQ acknowledgements are feedback performed by the terminal device for a downlink channel sent by the network device in the reference time unit. The reference time unit may be a starting time slot including at least one downlink transmission time slot that the network device performs most recently. The HARQ acknowledgement includes ACK, NACK, discontinuous transmission (Discontinuous Transmission, DTX), or the like.
The basic bandwidth mentioned in the various embodiments of the present invention may have a frequency range of 20MHZ, and may specifically be a component carrier in carrier aggregation, where carrier aggregation may use multiple component carriers to perform uplink or downlink transmission. For example, three 20MHz component carriers are aggregated to support 60MHz bandwidth transmission, and the plurality of component carriers may or may not be adjacent to each other in the frequency domain.
The plurality of HARQ acknowledgements received in step S102 are typically from a plurality of terminal devices for which:
optionally, the network device may schedule a plurality of basic bandwidths for some terminal devices in the reference time unit; while only one basic bandwidth is scheduled for other terminal devices.
Optionally, the network device may also schedule multiple basic bandwidths for each of the multiple terminal devices in the reference time unit.
Optionally, the network device may also schedule a basic bandwidth for each of the plurality of terminal devices in the reference time unit, that is, the network device does not schedule any one of the plurality of terminal devices to span the plurality of basic bandwidths in the reference time unit, and of course, the embodiment of the present invention does not limit how many basic bandwidths are scheduled by the network device outside the reference time unit.
S104: the number of HARQ acknowledgements for one basic bandwidth is determined.
In this step, the network device may allocate HARQ acknowledgements (in particular, the number of HARQ acknowledgements) for each basic bandwidth based on the received plurality of HARQ acknowledgements.
Optionally, the plurality of HARQ acknowledgements include a first HARQ acknowledgement and a second HARQ acknowledgement, where a downlink channel corresponding to the first HARQ acknowledgement occupies a basic bandwidth in a reference time unit; and the downlink channel corresponding to the second HARQ response occupies a plurality of basic bandwidths in the reference time unit.
Since the downlink channel corresponding to the first HARQ acknowledgement occupies one basic bandwidth in the reference time unit, the number of the first HARQ acknowledgements is generally allocated to the corresponding one basic bandwidth, and does not need to be allocated to other basic bandwidths. How the number of second HARQ is allocated among the above-described plurality of basic bandwidths will be described below by way of example.
For example, the plurality of HARQ acknowledgements received by the network device includes N second HARQ acknowledgements, where the downlink channels corresponding to the N second HARQ acknowledgements occupy M identical basic bandwidths in the reference time unit, and M and N are integers greater than 2.
Alternatively, the network device may allocate N/M second HARQ acknowledgements for one basic bandwidth, i.e. the network device allocates the received second HARQ acknowledgements equally for one basic bandwidth.
Alternatively, the network device may allocate N second HARQ acknowledgements for one basic bandwidth, that is, allocate all received second HARQ acknowledgements for one basic bandwidth.
Alternatively, the network device may allocate the second HARQ acknowledgement fed back by some terminal devices into one basic bandwidth, allocate the second HARQ acknowledgement fed back by other terminal devices into another basic bandwidth, and so on.
The network device may consider the HARQ acknowledgement of the terminal device as DTX status, considering that the terminal device may not have received the scheduling of the network device, or that the network device has not received the HARQ acknowledgement of the terminal device due to interference. For the case that the network device does not receive the HARQ acknowledgement of the terminal device, the network device may make statistics with DTX as NACK.
It should be noted that, for a downlink channel, the network device only counts DTX once as a NACK, so as to avoid the repeated statistics problem caused by the terminal device after successfully feeding back the HARQ response for the downlink channel.
Of course, in other embodiments, the network device may not count DTX as NACK. Whether DXT is counted as NACK may depend on the implementation scenario and implementation requirements of the present embodiment, and is not limited herein.
It should be noted that, in this step and the subsequent steps, a "basic bandwidth" is mentioned, where if downlink channels corresponding to a plurality of received HARQ acknowledgements occupy a basic bandwidth in a reference time unit, the "a basic bandwidth" refers to the "a basic bandwidth" specifically; if the downlink channel corresponding to the received plurality of HARQ acknowledgements occupies a plurality of basic bandwidths in the reference time unit, the "one basic bandwidth" herein may refer to any one of the plurality of basic bandwidths.
S106: and adjusting the CWS corresponding to the one basic bandwidth based on the ratio of negative acknowledgement NACK in the one basic bandwidth.
Note that, in steps S104 and S106 of this embodiment, the number of HARQ acknowledgements of one basic bandwidth is determined, and the CWS is adjusted based on the ratio of NACKs in the basic bandwidth, and in fact, the method provided in this embodiment may be used to determine the number of HARQ acknowledgements of each basic bandwidth, and adjust the CWS based on the ratio of NACKs in each basic bandwidth, as is applicable to the plurality of basic bandwidths.
The term "adjusting" used in the various embodiments of the present invention may be replaced by other terms, such as "adjusting" the CWS, "increasing or decreasing" the CWS, or "controlling" the CWS, etc.
The number of HARQ acknowledgements for each basic bandwidth may be determined in step S104, where the HARQ acknowledgements include NACK, and this step may be performed for each basic bandwidth:
if the ratio of NACK in the basic bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the basic bandwidth to the next higher allowable value of the current Priority class (P), and maintaining the increased value, and
and if the NACK ratio in the basic bandwidth is smaller than the reference value, setting the CWS corresponding to the basic bandwidth as the minimum value of the current priority level.
The above reference value may be specifically 50%,80%, or the like. The priority level P epsilon {1,2,3,4}.
Optionally, if the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the basic bandwidth to the next higher allowable value of the current priority level and maintaining the increased value may include:
if the ratio of NACK in the basic bandwidth is equal to or greater than a reference value and the CWS is smaller than the maximum CWS, adjusting the CWS corresponding to the basic bandwidth to a next higher allowable value of the current priority level and maintaining the increased value; or alternatively
If the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value and the CWS is equal to the maximum CWS, the CWS corresponding to the basic bandwidth is maintained as the maximum CWS.
An embodiment of the present invention herein shows a specific implementation of the foregoing step S106. Of course, it should be understood that step S106 may be implemented in other manners, which are not limited by the embodiment of the present invention.
According to the CWS adjusting method in the unlicensed spectrum transmission, when the network equipment receives a plurality of HARQ responses, the network equipment can determine the number of the HARQ responses of each basic bandwidth and adjust the CWS based on the NACK ratio in each basic bandwidth, so that the problem of adjusting the CWS in a broadband operation scene is solved, and the utilization efficiency of an unlicensed frequency band is improved.
As shown in fig. 2, another embodiment of the present invention provides a CWS adjustment method 200 in unlicensed spectrum transmission for adjusting CWS in a broadband operation scenario, which may be performed by a network device, including the following steps:
s202: a plurality of HARQ acknowledgements is received, the plurality of HARQ acknowledgements including a first HARQ acknowledgement and a second HARQ acknowledgement.
In this embodiment, the downlink channel corresponding to the first HARQ response occupies a basic bandwidth in a reference time unit; and the downlink channel corresponding to the second HARQ response occupies a plurality of basic bandwidths in the reference time unit.
The plurality of HARQ acknowledgements are feedback performed by the terminal device for a downlink channel sent by the network device in the reference time unit. The reference time unit may be a starting time slot including at least one downlink transmission time slot that the network device performs most recently. The HARQ acknowledgement includes ACK, NACK, DTX, or the like.
The network device may consider the HARQ acknowledgement of the terminal device as DTX status, considering that the terminal device may not have received the scheduling of the network device, or that the network device has not received the HARQ acknowledgement of the terminal device due to interference. For the case that the network device does not receive the HARQ acknowledgement of the terminal device, the network device may make statistics with DTX as NACK.
It should be noted that, for a downlink channel, the network device only counts DTX once as a NACK, so as to avoid the repeated statistics problem caused by the terminal device after successfully feeding back the HARQ response for the downlink channel.
Of course, in other embodiments, the network device may not count DTX as NACK. Whether DXT is counted as NACK may depend on the implementation scenario and implementation requirements of the present embodiment, and is not limited herein.
S204: and distributing the second HARQ response to the plurality of basic bandwidths according to a preset proportion.
In this embodiment, the number of HARQ acknowledgements of one basic bandwidth is related to the number of first HARQ acknowledgements corresponding to the basic bandwidth and the number of second HARQ acknowledgements plus a preset weight. Optionally, the preset weight is equal to the inverse of the number of the plurality of basic bandwidths.
Specifically, the step may allocate, for each terminal device that has scheduled a basic bandwidth, the received first HARQ response to the basic bandwidth; in special cases, there may be no terminal device that has scheduled one basic bandwidth, i.e. the network device schedules multiple basic bandwidths for the terminal device in the reference time unit.
And distributing the received second HARQ response to the plurality of basic bandwidths according to a preset proportion (which is equal to the preset weight) for each terminal device which schedules the plurality of basic bandwidths, wherein the preset proportion can be equal proportion or any other proportion.
For example, as shown in fig. 3, the network device schedules 2 basic bandwidths for the terminal a in the reference time unit, that is, the PDSCH transmitted by the network device to the terminal a in the reference time unit occupies two basic bandwidths, each of which is 20MHZ, and is subsequently referred to as a first basic bandwidth (one of the high frequency domain) and a second basic bandwidth (one of the low frequency domain).
Assuming that terminal a feeds back the HARQ acknowledgement of eight bits 00100000 (i.e., the second HARQ acknowledgement described above), it may indicate that the network device transmits data through 8 CBGs, i.e., the first CBG to the eighth CBG, and the terminal device does not successfully decode the third CBG, where 1 indicates that decoding fails, and 0 indicates that decoding is successful.
The step can be based on the HARQ response of eight bits fed back by the terminal A, 4 bits are allocated for the first basic bandwidth, and 0.5 NACK is contained in the 4 bits; the second basic bandwidth is allocated 4 bits, of which 0.5 NACKs are present.
The above is merely described by taking one terminal device that schedules multiple basic bandwidths as an example, step S204 may allocate, for each terminal device that schedules multiple basic bandwidths, the received second HARQ response to the multiple basic bandwidths according to a preset ratio, and finally, sum the number of second HARQ responses allocated to each basic bandwidth and the number of first HARQ responses corresponding to the basic bandwidth as the number of HARQ responses in each basic bandwidth.
Optionally, as an embodiment, the above preset ratio is the inverse of the number of the plurality of basic bandwidths, that is, the received second HARQ acknowledgement is equally allocated to each basic bandwidth.
S206: and adjusting the CWS corresponding to the one basic bandwidth based on the NACK ratio in the one basic bandwidth.
The step S204 can determine the number of HARQ acknowledgements for each basic bandwidth, and since the HARQ acknowledgements include NACK, the step can be performed for each basic bandwidth:
if the ratio of NACK in the basic bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the basic bandwidth to the next higher allowable value of the current priority level and maintaining the increased value, and
and if the NACK ratio in the basic bandwidth is smaller than the reference value, setting the CWS corresponding to the basic bandwidth as the minimum value of the current priority level.
The above reference value may be specifically 50%,80%, or the like.
Optionally, if the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the basic bandwidth to a next higher allowable value of the current priority level and maintaining the increased value includes:
if the ratio of NACK in the basic bandwidth is equal to or greater than a reference value and the CWS is smaller than the maximum CWS, adjusting the CWS corresponding to the basic bandwidth to a next higher allowable value of the current priority level and maintaining the increased value; or alternatively
If the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value and the CWS is equal to the maximum CWS, the CWS corresponding to the basic bandwidth is maintained as the maximum CWS.
An embodiment of the present invention herein shows a specific implementation of the foregoing step S206. Of course, it should be understood that step S206 may be implemented in other manners, and embodiments of the present invention are not limited thereto.
According to the CWS adjusting method in the unlicensed spectrum transmission, when the network equipment receives a plurality of HARQ responses, the network equipment can determine the number of the HARQ responses of each basic bandwidth and adjust the CWS based on the ratio of negative acknowledgement NACK in each basic bandwidth, so that the problem of adjusting the CWS in a broadband operation scene is solved, and the utilization efficiency of an unlicensed frequency band is improved.
As shown in fig. 4, one embodiment of the present invention provides a CWS adjustment method 400 in unlicensed spectrum transmission for CWS adjustment in a broadband operation scenario, which may be performed by a network device, including the following steps:
s402: a plurality of HARQ acknowledgements is received, the plurality of HARQ acknowledgements including a first HARQ acknowledgement and a second HARQ acknowledgement.
In this embodiment, the downlink channel corresponding to the first HARQ response occupies a basic bandwidth in the reference time unit; and the downlink channel corresponding to the second HARQ response occupies a plurality of basic bandwidths in the reference time unit.
The plurality of HARQ acknowledgements are feedback performed by the terminal device for a downlink channel sent by the network device in the reference time unit. The reference time unit may be a starting time slot including at least one downlink transmission time slot that the network device performs most recently. The HARQ acknowledgement includes ACK, NACK, DTX, or the like.
The network device may consider the HARQ acknowledgement of the terminal device as DTX status, considering that the terminal device may not have received the scheduling of the network device, or that the network device has not received the HARQ acknowledgement of the terminal device due to interference. For the case that the network device does not receive the HARQ acknowledgement of the terminal device, the network device may make statistics with DTX as NACK.
It should be noted that, for a downlink channel, the network device only counts DTX once as a NACK, so as to avoid the repeated statistics problem caused by the terminal device after successfully feeding back the HARQ response for the downlink channel.
Of course, in other embodiments, the network device may not count DTX as NACK. Whether DXT is counted as NACK may depend on the implementation scenario and implementation requirements of the present embodiment, and is not limited herein.
S404: and distributing the second HARQ response to the plurality of basic bandwidths.
In this embodiment, the number of HARQ acknowledgements of one basic bandwidth, the number of the first HARQ acknowledgements corresponding to the basic bandwidth, is related to the sum of the number of the second HARQ acknowledgements.
Specifically, the step may allocate, for each terminal device that has scheduled a basic bandwidth, the received first HARQ response to the basic bandwidth; in special cases, there may be no terminal device that has scheduled one basic bandwidth, i.e. the network device schedules multiple basic bandwidths for the terminal device in the reference time unit.
And distributing the received second HARQ response to each terminal device which schedules a plurality of basic bandwidths into each basic bandwidth in the plurality of basic bandwidths.
For example, as shown in fig. 3, the network device schedules 2 basic bandwidths for the terminal a in the reference time unit, each of which is 20MHZ, and then calls for a first basic bandwidth (one of the high frequency domain) and a second basic bandwidth (one of the low frequency domain).
Assuming that terminal a feeds back the HARQ acknowledgement of eight bits 00100000 (i.e., the second HARQ acknowledgement described above), it may indicate that the network device transmits data through 8 CBGs, i.e., the first CBG to the eighth CBG, and the terminal device does not successfully decode the third CBG, where 1 indicates that decoding fails, and 0 indicates that decoding is successful.
The step can be based on the HARQ response of the terminal A feedback eight bits, 8 bits are allocated for the first basic bandwidth, and 1 NACK is in the 8 bits; 8 bits are allocated for the second basic bandwidth, and 1 NACK out of the 8 bits.
The above description is merely given by taking one terminal device that schedules a plurality of basic bandwidths as an example, and step S404 may allocate, for each terminal device that schedules a plurality of basic bandwidths, the received second HARQ response to the plurality of basic bandwidths; and finally, taking the sum of the numbers of the second HARQ responses allocated to each basic bandwidth and the number of the first HARQ responses corresponding to the basic bandwidth as the number of the HARQ responses in each basic bandwidth.
S406: and adjusting the CWS corresponding to the one basic bandwidth based on the NACK ratio in the one basic bandwidth.
The number of HARQ acknowledgements for each basic bandwidth can be determined by step S404, and since the HARQ acknowledgements include NACK, the step can be performed for each basic bandwidth:
if the ratio of NACK in the basic bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the basic bandwidth to the next higher allowable value of the current priority level and maintaining the increased value, and
And if the NACK ratio in the basic bandwidth is smaller than the reference value, setting the CWS corresponding to the basic bandwidth as the minimum value of the current priority level.
The above reference value may be specifically 50%,80%, or the like.
Optionally, if the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the basic bandwidth to a next higher allowable value of the current priority level and maintaining the increased value includes:
if the ratio of NACK in the basic bandwidth is equal to or greater than a reference value and the CWS is smaller than the maximum CWS, adjusting the CWS corresponding to the basic bandwidth to a next higher allowable value of the current priority level and maintaining the increased value; or alternatively
If the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value and the CWS is equal to the maximum CWS, the CWS corresponding to the basic bandwidth is maintained as the maximum CWS.
An embodiment of the present invention herein shows a specific implementation of the foregoing step S406. Of course, it should be understood that step S406 may be implemented in other manners, which are not limited by the embodiment of the present invention.
According to the CWS adjusting method in the unlicensed spectrum transmission, when the network equipment receives a plurality of HARQ responses, the network equipment can determine the number of the HARQ responses of each basic bandwidth and adjust the CWS based on the ratio of negative acknowledgement NACK in each basic bandwidth, so that the problem of adjusting the CWS in a broadband operation scene is solved, and the utilization efficiency of an unlicensed frequency band is improved.
As shown in fig. 5, one embodiment of the present invention provides a CWS adjustment method 500 in unlicensed spectrum transmission for CWS adjustment in a broadband operation scenario, which may be performed by a network device, including the following steps:
s502: a plurality of HARQ acknowledgements is received, the plurality of HARQ acknowledgements including a first HARQ acknowledgement and a second HARQ acknowledgement.
In this embodiment, the downlink channel corresponding to the first HARQ response occupies a basic bandwidth in the reference time unit; and the downlink channel corresponding to the second HARQ response occupies a plurality of basic bandwidths in the reference time unit.
The plurality of HARQ acknowledgements are feedback performed by the terminal device for a downlink channel sent by the network device in the reference time unit. The reference time unit may be a starting time slot including at least one downlink transmission time slot that the network device performs most recently. The HARQ acknowledgement includes ACK, NACK, DTX, or the like.
The network device may consider the HARQ acknowledgement of the terminal device as DTX status, considering that the terminal device may not have received the scheduling of the network device, or that the network device has not received the HARQ acknowledgement of the terminal device due to interference. For the case that the network device does not receive the HARQ acknowledgement of the terminal device, the network device may make statistics with DTX as NACK.
It should be noted that, for a downlink channel, the network device only counts DTX once as a NACK, so as to avoid the repeated statistics problem caused by the terminal device after successfully feeding back the HARQ response for the downlink channel.
Of course, in other embodiments, the network device may not count DTX as NACK. Whether DXT is counted as NACK may depend on the implementation scenario and implementation requirements of the present embodiment, and is not limited herein.
S504: the second HARQ acknowledgement is allocated to one of the basic bandwidths for the terminal device that has scheduled the plurality of basic bandwidths.
In this embodiment, the number of HARQ acknowledgements of one basic bandwidth is related to the number of first HARQ acknowledgements corresponding to the basic bandwidth and the number of second HARQ acknowledgements allocated to the basic bandwidth. The embodiment may further allocate the second HARQ acknowledgement to one of the plurality of basic bandwidths based on the terminal device feeding back the second HARQ acknowledgement.
Specifically, the step may allocate, for each terminal device that has scheduled a basic bandwidth, the received first HARQ response to the basic bandwidth; in special cases, there may be no terminal device that has scheduled one basic bandwidth, i.e. the network device schedules multiple basic bandwidths for the terminal device in the reference time unit.
And distributing the received second HARQ response to one basic bandwidth in the plurality of basic bandwidths for each terminal device which schedules the plurality of basic bandwidths.
For example, terminal a, terminal B and terminal C each schedule a plurality of identical basic bandwidths, and a second HARQ response fed back by terminal a with eight bits may be allocated to the first basic bandwidth shown in fig. 3; distributing the feedback second HARQ response of the terminal B to the first basic bandwidth shown in fig. 3; the feedback of the second HARQ acknowledgement by the terminal C is allocated to the first basic bandwidth shown in fig. 3, etc.
Step S504 may use the sum of the number of second HARQ acknowledgements allocated to one basic bandwidth and the number of first HARQ acknowledgements corresponding to the basic bandwidth as the number of HARQ acknowledgements in one basic bandwidth.
For a terminal device that schedules multiple basic bandwidths, the basic bandwidth to which the feedback HARQ response (i.e., the second HARQ response) is allocated may be the highest frequency, the lowest frequency, or other than the highest frequency and the lowest frequency in the multiple basic bandwidths.
S506: based on the ratio of NACKs in one basic bandwidth, the CWS corresponding to one basic bandwidth is adjusted.
The number of HARQ acknowledgements for each basic bandwidth can be determined by step S504, and since the HARQ acknowledgements include NACK, the step can be performed for each basic bandwidth:
if the ratio of NACK in the basic bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the basic bandwidth to the next higher allowable value of the current priority level and maintaining the increased value, and
and if the NACK ratio in the basic bandwidth is smaller than the reference value, setting the CWS corresponding to the basic bandwidth as the minimum value of the current priority level.
The above reference value may be specifically 50%,80%, or the like.
Optionally, if the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the basic bandwidth to a next higher allowable value of the current priority level and maintaining the increased value includes:
if the ratio of NACK in the basic bandwidth is equal to or greater than a reference value and the CWS is smaller than the maximum CWS, adjusting the CWS corresponding to the basic bandwidth to a next higher allowable value of the current priority level and maintaining the increased value; or alternatively
If the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value and the CWS is equal to the maximum CWS, the CWS corresponding to the basic bandwidth is maintained as the maximum CWS.
An embodiment of the present invention herein shows a specific implementation of the foregoing step S506. Of course, it should be understood that step S506 may be implemented in other manners, which are not limited by the embodiment of the present invention.
According to the CWS adjusting method in the unlicensed spectrum transmission, when the network equipment receives a plurality of HARQ responses, the network equipment can determine the number of the HARQ responses of each basic bandwidth and adjust the CWS based on the ratio of negative acknowledgement NACK in each basic bandwidth, so that the problem of adjusting the CWS in a broadband operation scene is solved, and the utilization efficiency of an unlicensed frequency band is improved.
As shown in fig. 6, one embodiment of the present invention provides a CWS adjustment method 600 in unlicensed spectrum transmission for CWS adjustment in a broadband operation scenario, which may be performed by a network device, including the following steps:
s602: and receiving a plurality of HARQ replies, wherein the downlink channels corresponding to the plurality of HARQ replies occupy a basic bandwidth in a reference time unit.
The plurality of HARQ acknowledgements are feedback performed by the terminal device for a downlink channel sent by the network device in the reference time unit. The reference time unit may be a starting time slot including at least one downlink transmission time slot that the network device performs most recently. The HARQ acknowledgement includes ACK, NACK, DTX, or the like.
In this embodiment, the network device does not schedule any terminal device to span multiple basic bandwidths in the above reference time unit, and of course, the embodiment of the present invention does not limit how many basic bandwidths are scheduled by the network device outside the reference time unit.
The network device may consider the HARQ acknowledgement of the terminal device as DTX status, considering that the terminal device may not have received the scheduling of the network device, or that the network device has not received the HARQ acknowledgement of the terminal device due to interference. For the case that the network device does not receive the HARQ acknowledgement of the terminal device, the network device may make statistics with DTX as NACK.
It should be noted that, for a downlink channel, the network device only counts DTX once as a NACK, so as to avoid the repeated statistics problem caused by the terminal device after successfully feeding back the HARQ response for the downlink channel.
Of course, in other embodiments, the network device may not count DTX as NACK. Whether DXT is counted as NACK may depend on the implementation scenario and implementation requirements of the present embodiment, and is not limited herein.
S604: and adjusting the CWS corresponding to the basic bandwidth based on the NACK ratio in the basic bandwidth.
This step can be performed for the basic bandwidth, if the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value, the CWS corresponding to the basic bandwidth is adjusted to the next higher allowable value of the current priority level and the increased value is maintained, or
And if the NACK ratio in the basic bandwidth is smaller than the reference value, setting the CWS corresponding to the basic bandwidth as the minimum value of the current priority level.
The above reference value may be specifically 50%,80%, or the like.
Optionally, if the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the basic bandwidth to a next higher allowable value of the current priority level and maintaining the increased value includes:
if the ratio of NACK in the basic bandwidth is equal to or greater than a reference value and the CWS is smaller than the maximum CWS, adjusting the CWS corresponding to the basic bandwidth to a next higher allowable value of the current priority level and maintaining the increased value; or alternatively
If the ratio of NACKs in the basic bandwidth is equal to or greater than the reference value and the CWS is equal to the maximum CWS, the CWS corresponding to the basic bandwidth is maintained as the maximum CWS.
An embodiment of the present invention herein shows a specific implementation of the foregoing step S604. Of course, it should be understood that step S604 may be implemented in other manners, and embodiments of the present invention are not limited thereto.
According to the CWS adjusting method in the unlicensed spectrum transmission, when the network equipment receives a plurality of HARQ responses, the network equipment can determine the number of the HARQ responses of the basic bandwidth and adjust the CWS based on the ratio of negative acknowledgement NACK in the basic bandwidth, so that the problem of adjusting the CWS in a broadband operation scene is solved, and the utilization efficiency of an unlicensed frequency band is improved.
The CWS adjustment method in unlicensed spectrum transmission according to an embodiment of the present invention is described in detail above with reference to fig. 1 to 6. A network device according to an embodiment of the present invention will be described in detail with reference to fig. 7.
Fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present invention. As shown in fig. 7, the network device 700 includes:
a receiving module 702, configured to receive a plurality of HARQ acknowledgements, where a downlink channel corresponding to the plurality of HARQ acknowledgements occupies one or more basic bandwidths in a reference time unit;
a number determining module 704, configured to determine a number of HARQ acknowledgements for a basic bandwidth;
the CWS adjustment module 706 may be configured to adjust the CWS corresponding to the one basic bandwidth based on a ratio of NACKs in the one basic bandwidth.
According to the network equipment provided by the embodiment of the invention, when a plurality of HARQ replies are received, the number of the HARQ replies of each basic bandwidth can be determined, the CWS is regulated based on the NACK ratio in each basic bandwidth, the problem of regulating the CWS in a broadband operation scene is solved, and the utilization efficiency of an unlicensed frequency band is improved.
Optionally, as an embodiment, the plurality of HARQ acknowledgements includes a first HARQ acknowledgement and a second HARQ acknowledgement, wherein,
the downlink channel corresponding to the first HARQ response occupies a basic bandwidth in the reference time unit; and the downlink channel corresponding to the second HARQ response occupies a plurality of basic bandwidths in the reference time unit.
Optionally, as an embodiment, the number of HARQ acknowledgements of a basic bandwidth, the number of first HARQ acknowledgements corresponding to the basic bandwidth, and the number of second HARQ acknowledgements are related to a preset weight.
Optionally, as an embodiment, the preset weight is an inverse of the number of the plurality of basic bandwidths.
Optionally, as an embodiment, the number of HARQ acknowledgements of a basic bandwidth, the number of first HARQ acknowledgements corresponding to the basic bandwidth, is related to the sum of the number of second HARQ acknowledgements.
Optionally, as an embodiment, the number of HARQ acknowledgements of a basic bandwidth, the number of said first HARQ acknowledgements corresponding to the basic bandwidth, and the number of said second HARQ acknowledgements allocated to the basic bandwidth are related.
Optionally, as an embodiment, the number determining module 704 may be further configured to allocate the second HARQ response to one of the plurality of basic bandwidths based on the terminal device feeding back the second HARQ response.
Optionally, as an embodiment, the allocated one basic bandwidth is the highest frequency, the lowest frequency, or the outside of the highest frequency and the lowest frequency in the plurality of basic bandwidths.
Optionally, as an embodiment, the downlink channel occupies one basic bandwidth in a reference time unit, where the network device does not schedule any terminal device to span multiple basic bandwidths in the reference time unit.
Alternatively, as an embodiment, the CWS adjustment module 706 may be configured to:
if the ratio of NACK in the basic bandwidth is equal to or greater than the reference value, the CWS corresponding to the basic bandwidth is adjusted to the next higher allowable value of the current priority level and the increased value is maintained, or
If the NACK ratio in the basic bandwidth is smaller than the reference value, the CWS corresponding to the basic bandwidth is set as the minimum value of the current priority level.
Alternatively, as an embodiment, the CWS adjustment module 706 may be configured to:
if the ratio of NACK in the basic bandwidth is equal to or greater than the reference value and the CWS corresponding to the basic bandwidth is less than the maximum CWS, adjusting the CWS corresponding to the basic bandwidth to the next higher allowable value and maintaining the increased value; or alternatively
If the ratio of NACK in the basic bandwidth is smaller than the reference value and the CWS corresponding to the basic bandwidth is equal to the maximum CWS, the CWS corresponding to the basic bandwidth is kept as the maximum CWS.
The network device 700 according to the embodiment of the present invention may refer to the respective flows of the methods 100 to 600 corresponding to the embodiment of the present invention, and each unit/module in the network device 700 and the other operations and/or functions described above are respectively for implementing the respective flows of the methods 100 to 600, which are not described herein for brevity.
Referring to fig. 8, fig. 8 is a block diagram of a network device to which the embodiment of the present invention is applied, and details of method embodiments 100 to 600 can be implemented, and the same effects are achieved. As shown in fig. 8, the network device 800 includes: a processor 801, a transceiver 802, a memory 803, and a bus interface, wherein:
in an embodiment of the present invention, the network device 800 further includes: computer programs stored on the memory 803 and executable on the processor 801, which when executed by the processor 801 implement the steps of method embodiment 100 to method embodiment 600.
In fig. 8, a bus architecture may be comprised of any number of interconnected buses and bridges, and in particular, one or more processors represented by the processor 801 and various circuits of the memory represented by the memory 803. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 802 may be a number of elements, i.e., including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium.
The processor 801 is responsible for managing the bus architecture and general processing, and the memory 803 may store data used by the processor 801 in performing operations.
The embodiment of the present invention further provides a computer readable storage medium, on which a computer program is stored, where the computer program when executed by a processor implements each process of the foregoing method embodiments 100 to 600, and the same technical effects can be achieved, and for avoiding repetition, a detailed description is omitted herein. Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (13)
1. A method for contention window size CWS adjustment in unlicensed spectrum transmission, the method being performed by a network device, the method comprising:
receiving a plurality of hybrid automatic repeat request (HARQ) responses, wherein downlink channels corresponding to the plurality of HARQ responses occupy one or more basic bandwidths in a reference time unit;
determining the HARQ response quantity of a basic bandwidth;
adjusting the CWS corresponding to the one basic bandwidth based on the ratio of negative acknowledgement NACK in the one basic bandwidth;
the plurality of HARQ replies comprise a first HARQ reply and a second HARQ reply, the downlink channel corresponding to the first HARQ reply occupies one basic bandwidth in the reference time unit, and the downlink channel corresponding to the second HARQ reply occupies a plurality of basic bandwidths in the reference time unit.
2. The method of claim 1, wherein,
the number of HARQ acknowledgements of the one basic bandwidth is related to the number of the first HARQ acknowledgements corresponding to the basic bandwidth and the number of the second HARQ acknowledgements plus a preset weight.
3. The method of claim 2, wherein,
the preset weight is equal to the inverse of the number of the plurality of basic bandwidths.
4. The method of claim 1, wherein,
the number of HARQ acknowledgements of the one basic bandwidth, the number of the first HARQ acknowledgements corresponding to the basic bandwidth, and the number of the second HARQ acknowledgements are summed.
5. The method of claim 1, wherein,
the number of HARQ acknowledgements of the one basic bandwidth, the number of the first HARQ acknowledgements corresponding to the basic bandwidth, and the number of the second HARQ acknowledgements allocated to the basic bandwidth are related.
6. The method of claim 5, wherein the method further comprises:
and distributing the second HARQ response to one basic bandwidth in the plurality of basic bandwidths based on the terminal equipment feeding back the second HARQ response.
7. The method of claim 6, wherein,
the allocated one basic bandwidth is the highest frequency, the lowest frequency, or outside the highest frequency and the lowest frequency of the plurality of basic bandwidths.
8. The method of claim 1, wherein the downlink channel occupies one basic bandwidth in the reference time unit, wherein the network device does not schedule any terminal device to span multiple basic bandwidths in the reference time unit.
9. The method of any of claims 1 to 8, wherein the adjusting the CWS corresponding to the one basic bandwidth based on the ratio of NACKs within the one basic bandwidth comprises:
if the ratio of NACK in the basic bandwidth is equal to or greater than the reference value, the CWS corresponding to the basic bandwidth is adjusted to the next higher allowable value of the current priority level and the increased value is maintained, or
If the NACK ratio in the basic bandwidth is smaller than the reference value, the CWS corresponding to the basic bandwidth is set as the minimum value of the current priority level.
10. The method of claim 9, wherein if the ratio of NACKs within the base bandwidth is equal to or greater than the reference value, adjusting the CWS corresponding to the base bandwidth to a next higher allowable value of the current priority level and maintaining the increased value comprises:
if the ratio of NACK in the basic bandwidth is equal to or greater than the reference value and the CWS corresponding to the basic bandwidth is less than the maximum CWS, adjusting the CWS corresponding to the basic bandwidth to the next higher allowable value and maintaining the increased value; or alternatively
If the ratio of NACK in the basic bandwidth is smaller than the reference value and the CWS corresponding to the basic bandwidth is equal to the maximum CWS, the CWS corresponding to the basic bandwidth is kept as the maximum CWS.
11. A network device, comprising:
a receiving module, configured to receive a plurality of HARQ acknowledgements, where a downlink channel corresponding to the plurality of HARQ acknowledgements occupies one or more basic bandwidths in a reference time unit;
a quantity determining module, configured to determine a number of HARQ acknowledgements for a basic bandwidth;
the CWS adjusting module is used for adjusting the CWS corresponding to the basic bandwidth based on the NACK ratio in the basic bandwidth;
the plurality of HARQ replies comprise a first HARQ reply and a second HARQ reply, the downlink channel corresponding to the first HARQ reply occupies one basic bandwidth in the reference time unit, and the downlink channel corresponding to the second HARQ reply occupies a plurality of basic bandwidths in the reference time unit.
12. A network device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor, performs the steps of the CWS adjustment method in unlicensed spectrum transmission according to any one of claims 1 to 10.
13. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the CWS adjustment method in unlicensed spectrum transmission according to any of claims 1 to 10.
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