RU2787888C1 - Contention window determination method, communication device and data carrier - Google Patents

Abstract

FIELD: wireless communication.

SUBSTANCE: invention relates to wireless communication. The contention window determination method includes: obtaining hybrid automatic repeat request (HARQ) feedback information based on a transmission unit (TB) within a predetermined time period, wherein the TB-based HARQ feedback information contains a no acknowledgment identifier. (NACK) and acknowledgment identifier (ACK); determining the relative number of NACKs in the TV-based HARQ feedback information based on a coefficient used to provide the proportion of TV-based HARQ and Code Block Group (CBG)-based HARQ, and determining the random access contention window (CWS) size in unlicensed frequency band based on said relative amount.

EFFECT: ensuring that the most appropriate CWS for the current transmission scenario can be obtained.

14 cl, 15 dwg

Description

FIELD OF TECHNOLOGY

The invention relates, without being limited to this, to the field of communication technology and, in particular, to a method for determining the contention window, a communication device and a data carrier.

BACKGROUND OF THE INVENTION

The 3rd ^generation partnership project (3GPP) currently proposes a mechanism based on license assisted access (LAA) to use the unlicensed band when developing a wireless communication system for the unlicensed frequency spectrum. frequencies, that is, the use of the unlicensed frequency band is carried out using the licensed frequency band. In order to coexist with other systems, such as the unlicensed band WiFi wireless communication system, the LAA-based mechanism introduces a channel discovery mechanism before data transmission.

SUMMARY OF THE INVENTION

The invention provides a method and apparatus for determining a contention window, a communication device, and a data carrier.

According to a first aspect of embodiments of the invention, a method for determining a contention window is provided. The method includes: determining a contention window size (CWS) of a random access contention window in an unlicensed frequency band based on reception feedback based on a transmission block.

In one embodiment of the invention, determining a CWS random access contention window in an unlicensed frequency band based on TV-based reception feedback includes: obtaining hybrid automatic repeat request (HARQ) feedback information based on TV, for a predetermined period of time, wherein the TV-based HARQ feedback information includes a no acknowledgment identifier (NACK) and an acknowledgment identifier (ACK); determining a relative amount of NACK in the HARQ feedback information based on the TV; and determining the CWS random access contention window in the unlicensed frequency band based on said relative number.

In one embodiment of the invention, determining the relative amount of NACK in the TV-based HARQ feedback information includes determining a first amount of TV-based HARQ feedback information that has been received within a predetermined period of time; determining a second number of NACKs; and determining the ratio of the second quantity to the first quantity.

In one embodiment of the invention, said relative amount comprises a first relative amount derived from TV-based reception feedback. Determining the CWS random access contention window in the unlicensed frequency band based on said relative number includes: determining the CWS random access contention window in the unlicensed frequency band based on the first relative number.

According to a second aspect of embodiments of the invention, a method for determining a contention window is provided. The method includes: determining a contention window size (CWS) of a random access contention window in an unlicensed frequency band based on a reception feedback based on a code block group (CBG).

In one embodiment of the invention, determining a CWS random access contention window in an unlicensed frequency band based on CBG-based reception feedback includes: obtaining hybrid automatic repeat request (HARQ) feedback based on CBG within a predetermined period time, wherein the TV-based HARQ feedback information includes a no acknowledgment identifier (NACK) and an acknowledgment identifier (ACK); determining a relative amount of NACK in the CBG-based HARQ feedback information; and determining the CWS random access contention window in the unlicensed frequency band based on said relative number.

In one embodiment of the invention, determining the relative amount of NACK in CBG-based HARQ feedback information includes determining a first amount of CBG-based HARQ feedback information that has been received within a predetermined time period; determining a second number of NACKs; and determining the ratio of the second quantity to the first quantity.

In one embodiment of the invention, said relative amount comprises a second relative amount derived from CBG-based reception feedback. Determining the CWS random access contention window in the unlicensed frequency band based on said relative number includes: determining the CWS random access contention window in the unlicensed frequency band based on the second relative number.

According to a third aspect of embodiments of the invention, a method for determining a contention window is provided. The method includes: determining a contention window size (CWS) of a random access contention window in an unlicensed frequency band based on a reception power of a predetermined reference signal.

In one embodiment of the invention, determining a CWS random access contention window in an unlicensed frequency band based on a receive power of a predetermined reference signal includes: measuring the receive power of a predetermined reference signal over a predetermined period of time; comparing the receive power with a predetermined receive power to obtain a comparison result; and determining the CWS random access contention window in the unlicensed frequency band based on the result of the comparison.

In one embodiment of the invention, the predetermined reference signal includes: a first type signal and a second type signal, wherein the first type signal has a predetermined function and a random access contention window CWS function, and the second type signal has a random access contention window CWS function.

According to a fourth aspect of the embodiments of the invention, an apparatus for determining a contention window is provided. The apparatus comprises: a first processing module configured to determine a contention window size (CWS) of a random access contention window in an unlicensed frequency band based on a transmission block (TB) based reception feedback.

In one embodiment of the invention, the first processing module comprises a first acquisition unit, a first calculation unit, and a first determination unit. The first acquisition unit is configured to receive TV-based hybrid automatic repeat request (HARQ) feedback information within a predetermined time period, wherein the TV-based HARQ feedback information contains a non-acknowledgment (NACK) identifier and an identifier acknowledgment of receipt (ACK). The first calculation unit is configured to determine the relative number of NACKs in the HARQ feedback information based on the TV. The first determining unit is configured to determine the CWS random access contention window in the unlicensed frequency band based on said relative number.

In one embodiment of the invention, the first calculation unit is also configured to: determine the first amount of TV-based HARQ feedback information that has been received within a predetermined period of time; determining a second number of NACKs; and determining the ratio of the second quantity to the first quantity.

In one embodiment of the invention, the first calculation unit is also configured to derive the first relative amount based on TV-based reception feedback. Determining the CWS random access contention window in the unlicensed frequency band based on said relative number includes: determining the CWS random access contention window in the unlicensed frequency band based on the first relative number.

According to a fifth aspect of the embodiments of the invention, an apparatus for determining a contention window is provided. The device comprises: a second processing module configured to determine a contention window size (CWS) of a random access contention window in an unlicensed frequency band based on Code Block Group (CBG) based reception feedback.

In one embodiment of the invention, the second processing module comprises a second acquisition unit, a second calculation unit, and a second determination unit. The second acquisition unit is configured to receive CBG-based hybrid automatic repeat request (HARQ) feedback information within a predetermined time period, wherein the TV-based HARQ feedback information contains a non-acknowledge (NACK) identifier and a acknowledgment of receipt (ACK). The second calculation unit is configured to determine the relative number of NACKs in the HARQ feedback information based on the CBG. The second determining unit is configured to determine the CWS random access contention window in the unlicensed frequency band based on said relative number.

In one embodiment of the invention, the second calculation unit is also configured to: determine a first amount of CBG-based HARQ feedback information that has been received within a predetermined time period; determining a second number of NACKs; and determining the ratio of the second quantity to the first quantity.

In one embodiment of the invention, the second calculation unit is also configured to obtain a second relative amount based on the CBG based reception feedback. Determining the CWS random access contention window in the unlicensed frequency band based on said relative number includes: determining the CWS random access contention window in the unlicensed frequency band based on the second relative number.

According to a fifth aspect of the embodiments of the invention, an apparatus for determining a contention window is provided. The apparatus comprises: a third processing module configured to determine a contention window size (CWS) of a random access contention window in an unlicensed frequency band based on a reception power of a predetermined reference signal.

In one embodiment of the invention, the third processing module comprises a measurement unit, a comparison unit, and a third determination unit. The measurement unit is configured to measure the reception power of a predetermined reference signal for a predetermined period of time. The comparison unit is configured to compare the receive power with a predetermined power to obtain a comparison result. The third determining unit is configured to determine the CWS random access contention window in the unlicensed frequency band based on the result of the comparison.

In one embodiment of the invention, the third processing module is configured to configure a predetermined reference signal such that it comprises a first type signal and a second type signal, wherein the first type signal has a predetermined function and a random access contention window CWS function, and the second type signal type has the function of defining the CWS random access contention window.

According to a seventh aspect of the embodiments of the invention, a communication device is provided that includes: an antenna, a memory, and a processor. The processor is connected to the antenna and the memory, respectively, and is configured to execute executable programs stored in the memory, control the antenna to receive and transmit signals, and implement the method for determining the contention window in accordance with any of the above technical solutions.

According to an eighth aspect of embodiments of the invention, a computer-readable storage medium with executable programs stored thereon is provided. When the executable programs are executed by the processor, the steps of the method for determining the contention window are carried out in accordance with any of the above-mentioned technical solutions.

In embodiments of the invention, a method for determining a contention window is provided, including: determining a contention window size (CWS) of a random access contention window in an unlicensed frequency band based on a transmission block (TB) based reception feedback. Thus, when it is desired to simultaneously support TV-based feedback or CBG-based feedback, the CWS of the unlicensed band random access contention window can be determined based on the TV-based reception feedback. Since the CWS adapts to TV-based reception feedback, it is possible to obtain a CWS more suitable for the current transmission scenario. In addition, a method for determining a contention window is provided, including determining a contention window size (CWS) of a contention window of random access in an unlicensed frequency band based on code block group (CBG) based reception feedback. Thus, when it is desired to simultaneously support TV-based feedback or CBG-based feedback, the CWS of the unlicensed band random access contention window can be determined based on the CBG-based reception feedback. Since the CWS adapts to the CBG-based receive feedback, it is possible to obtain a CWS more suitable for the current transmission scenario. Further, a method for determining a contention window is provided, including: determining a contention window size (CWS) of a random access contention window in an unlicensed frequency band based on a reception power of a predetermined reference signal. In this case, when it is desired to simultaneously support TV-based feedback or CBG-based feedback, the CWS of the random access contention window in the unlicensed frequency band may be determined based on the reception power of a predetermined reference signal. Since the CWS is adapted to the reception power of the predetermined reference signal, it is possible to obtain a CWS more suitable for the current transmission scenario.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention.

Fig. 2 is a flowchart illustrating a contention window determination method according to an embodiment of the invention.

Fig. 3 is a schematic diagram illustrating the ACK/NACK feedback delay according to an embodiment of the invention.

Fig. 4 is a flowchart illustrating a contention window determination method according to another embodiment of the invention.

Fig. 5 is a schematic diagram illustrating a category 4 channel detection mechanism that performs detection based on an idle channel estimate with random backoff according to an embodiment of the invention.

Fig. 6 is a flowchart illustrating a method for determining a contention window according to another embodiment of the invention.

Fig. 7 is a flowchart illustrating a method for determining a contention window according to another embodiment of the invention.

Fig. 8 is a flowchart illustrating a method for determining a contention window according to another embodiment of the invention.

Fig. 9 is a flowchart illustrating a method for determining a contention window according to another embodiment of the invention.

Fig. 10 is a flowchart illustrating a method for determining a contention window according to another embodiment of the invention.

Fig. 11 is a block diagram illustrating an apparatus for determining a contention window according to an embodiment of the invention.

Fig. 12 is a block diagram illustrating an apparatus for determining a contention window according to another embodiment of the invention.

Fig. 13 is a block diagram illustrating an apparatus for determining a contention window according to another embodiment of the invention.

Fig. 14 is a block diagram illustrating a terminal according to an embodiment of the invention.

Fig. 15 is a block diagram illustrating a base station according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

Next will be described in detail the embodiments of the invention, which are shown in the accompanying drawings. When in the following description reference is made to the accompanying drawings, the same numbers in different drawings represent the same or similar elements, unless otherwise indicated. The implementations described in the following examples do not represent all implementations of the present invention. They are merely examples of apparatus and method according to certain aspects of the present invention, as detailed in the appended claims.

The terms used in the description of the present invention are only intended to describe specific embodiments of the invention and do not limit the present invention. As used in the description of the present invention and the appended claims, the singular forms include the plural forms, unless expressly stated otherwise. It is also to be understood that, as used herein, the expression "and/or" represents and includes any and all possible combinations of one or more of the respective listed elements.

Although terms such as "first", "second" and "third" are used here to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish one element from another. For example, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information, within the scope of the present invention. As used herein, the word “if” may mean “when,” or “after,” or “in response to a determination,” or “in accordance with a determination,” or “in response to finding” that said antecedent condition is met, in context dependent.

The 3rd ^generation partnership project (3GPP) currently proposes a mechanism based on license assisted access (LAA) to use the unlicensed band when developing a wireless communication system for the unlicensed frequency spectrum. frequencies, that is, the use of the unlicensed frequency band is carried out using the licensed frequency band. In order to coexist with other systems, such as the unlicensed band WiFi wireless communication system, the LAA-based mechanism introduces a channel discovery mechanism before data transmission. The transmitting terminal must determine if the channel is free when there is data to transmit, and only when the channel is free can the transmitting terminal transmit data. Currently, there are many mechanisms for channel discovery. For example, in a channel discovery process for downlink transmission, a terminal may use a Category 4 (Cat4) channel discovery mechanism.

The Category 4 channel discovery mechanism is based on clear channel assessment (CCA) with random backoff. The wireless communication device uniformly and randomly generates a backoff counter N between 0 and a contention window size (CWS) and performs listening at a free channel estimation interval (CCA interval) level. If the channel is found to be idle during the listening time interval, the backoff counter is decremented by 1. If the channel is found to be busy, the backoff counter is suspended, i.e., the backoff counter remains unchanged for the channel's busy time until it is found that the channel is free. When the backoff counter shows 0, the wireless device can seize the channel immediately. Here, the CWS is dynamically adjusted in the Category 4 channel discovery mechanism. The wireless communication device dynamically adjusts the CWS based on whether the previous transmission is correctly received by the receiving node. However, in the prior art, it is possible that the CWS is not set up properly, which can cause conflict when using unlicensed bandwidth and poor random access performance.

Fig. 1 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system is a communication system based on cellular mobile communication technology. The wireless communication system may include multiple terminals 11 and multiple base stations 12.

Terminal 11 may refer to a device that provides voice and/or data communication for a user. Terminal 11 may communicate with one or more core networks via a radio access network (RAN, radio access network). The terminal 11 may be an IoT terminal, such as a touch device, a mobile phone (referred to as a cell phone) and a computer with an IoT terminal, for example, may be a fixed, portable, compact, wearable, computer-embedded or vehicle-mounted device, such as , station (STA), subscriber unit, subscriber station, mobile station, mobile, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device or user equipment (UE, user equipment). The terminal 11 may be an unmanned vehicle device, a vehicle-mounted device, etc., for example, a vehicle-mounted computer has a wireless communication function, or a wireless communication device externally connected to the vehicle-mounted computer. The terminal 11 may be a roadside device, such as a street lamp, a traffic light, or other roadside devices, each of which has a wireless communication function.

Base station 12 may be a network device in a wireless communication system. The wireless communication system may be a 4th generation (4G) mobile communication system, also referred to as a long term evolution (LTE) system; or the wireless communication system may be a 5G system, also called a new radio (NR, new radio) system. The wireless communication system may also be the next generation system after the 5G system. The access network in a 5G system may be referred to as a new generation-radio access network (NG-RAN). The wireless communication system may also be an MTC system.

Base station 12 may be an eNB adopted in a 4G system. Base station 12 may also be a centralized distributed architecture base station (gNB) in a 5G system. If the base station 12 has a centralized distributed architecture, it usually contains a central unit (CU, central unit) and at least two distributed units (DU, distributed unit). The central unit is equipped with a stack of protocols, including a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Media Access Control (MAC) layer. The distributed unit is provided with a stack of protocols, including the physical (PHY) layer. The specific implementation of the base station 12 is not limited to embodiments of the invention.

A wireless connection can be established between base station 12 and terminal 11 via a wireless radio interface. In various embodiments of the invention, the wireless air interface is a wireless air interface based on the 4G standard. Alternatively, the wireless air interface is a wireless air interface based on the 5G standard. For example, the wireless air interface is NR. Alternatively, the wireless air interface may also be a wireless air interface based on a next generation mobile communication network technology standard based on 5G.

In some embodiments of the invention, an end-to-end connection can be established between the terminals 11, for example, in such a scenario as communication between vehicles (V2V, vehicle to vehicle), communication between vehicles and infrastructure (V2I, vehicle to infrastructure) and communication between vehicles. vehicles and pedestrians (V2P, vehicle to pedestrian) when communicating between the vehicle and all objects (V2X, vehicle to everything).

In some embodiments of the invention, the wireless communication system may also contain the device 13 network management.

The server base stations 12 are respectively connected to the network management device 13 . The network control device 13 may be a core network device in a wireless communication system. For example, the network management device 13 may be a mobility management entity (MME) of an evolved packet core (EPC) network. Alternatively, the network control device may also be another core network device such as a serving gateway (SGW, serving gateway), a public data network gateway (PGW), and a charging policy and rule function (PCRF) policy and charging rules function) or home subscriber server (HSS, home subscriber server). The implementation form of the network control device 13 is not limited to embodiments of the invention.

Fig. 2 is a flowchart illustrating a contention window determination method according to an embodiment of the invention. The method includes the following.

In step S110, a contention window size (CWS) of a random access contention window in the unlicensed frequency band is determined based on the transmission block (TB) based reception feedback.

Here, the TV-based reception feedback may be a TV-based Hybrid Automatic Repeat Request (HARQ) feedback. It should be noted that in a wireless communication system, due to time-varying characteristics of a wireless channel and the effect of multipath fading, signal transmission may be disrupted, resulting in data transmission failure. To solve this problem, a HARQ mechanism is introduced in a wireless communication system. Based on the successful or unsuccessful reception of the data returned by the receiving device, the transmitting device decides whether to retransmit a data packet that has already been transmitted. In the LTE system, the data transmission time has a time dependence on the ACK/NACK feedback time. Due to the limited processing capability of the terminal in the LTE system, as shown in FIG. 3, where downlink data transmission is given as an example, the data transmission time and the ACK/NACK feedback time have a difference of 4 ms. It should be noted that a CBG-based feedback mechanism has been introduced in the structure of the 5G NR system. That is, a single TV transmission may include multiple CBGs. The receiver may perform HARQ feedback for each CBG without performing feedback for the entire TV. Here, using the TV-based feedback mode may reduce signaling overhead and control channel resources, but may waste a resource for retransmission. Using the CBG-based feedback mode can reduce the number of times the entire TV is retransmitted to reduce the wastage of transmission resources due to retransmission, but can lead to an increase in control signaling. The feedback mode can be adjusted based on actual situations, so that control signaling overhead can be controlled while improving data transmission efficiency.

Here, the TV-based reception feedback data transmission device may be a user equipment (UE), and the corresponding data reception device may be a base station. It should be noted that when the feedback data transmitting device is a UE, the corresponding data receiving device may also be a UE, for example, in an all-entity-to-all-entity sidelink or V2X communication. Here, the CWS may be a time duration corresponding to the contention window. For example, taking a slot as a unit of time, the minimum CWS can be set to 15 slots.

In an embodiment of the invention, the CWS random access contention windows in the unlicensed frequency band may be determined based on TV-based reception feedback. Since the CWS adapts to TV-based reception feedback, it is possible to obtain a CWS more suitable for the current transmission scenario.

In one embodiment of the invention, as shown in FIG. 4, a method for determining a contention window is provided. The step of determining the CWS random access contention window in the unlicensed frequency band based on the TV-based reception feedback in step S110 may include the following.

In step S210, TV-based HARQ feedback information is obtained within a predetermined period of time. TV based HARQ feedback information includes NACK and ACK.

In step S220, the relative number of NACKs in the TV-based HARQ feedback information is determined.

In step S230, CWS determine random access contention windows in the unlicensed frequency band based on said relative number.

Here, the predetermined time period may be a time period corresponding to a time interval, a symbol, a subframe, a wireless communication frame, or another configured time period.

Here, when transmitting data based on TV-based HARQ feedback, the data receiving apparatus determines whether the data is received correctly. When data is received correctly, an ACK is returned. When the data is not received correctly, a NACK is returned. Here, ACK/ACK is transmitted on a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

Here, in an embodiment of the invention, there are two TV-based Physical Downlink Shared Channel (PDSCH) transmissions having HARQ feedback to be performed in the same time slot, and one of them returns NACK, so the relative amount of NACK in the HARQ feedback information is 1/2=0.5.

Here, determining the CWS of a random access contention window in the unlicensed frequency band based on said relative number may include: when the relative number of NACKs in the HARQ feedback information is greater than a predetermined threshold, increasing the CWS; when the relative number of NACKs in the HARQ feedback information does not exceed a predetermined threshold, setting the CWS to a predetermined minimum value. In addition, when the number of times the CWS is kept equal to the predetermined maximum value reaches the predetermined number, the CWS is set to the predetermined minimum value. As shown in FIG. 5, as an example, take a category 4 channel discovery mechanism that performs discovery based on an idle channel estimate with random backoff. The backoff counter N is generated by the wireless communication device randomly and uniformly between 0 and CWS, and listening is performed at the CCA interval level. If the channel is found to be free in the CCA interval (that is, the CCA interval is free), the backoff counter is decremented by 1. If the channel is detected to be busy in the CCA interval (that is, the CCA interval is busy), the backoff counter is suspended, that is, the backoff counter transmission remains unchanged during the busy CCA interval until the channel is found to be free. When the backoff counter shows 0, the wireless device can seize the channel immediately. In the category 4 channel discovery mechanism, the CWS may be adjusted dynamically. The wireless communication device dynamically adjusts the CWS based on whether the previous transmission was correctly received by the receiving node. Thus, a suitable CWS can be obtained based on the link state and network load, so that a trade-off between reducing collisions between nodes and improving the efficiency of link access is achieved. Assume that the CWS corresponding to the first downlink PDSCH transmission is 15, if the terminal cannot successfully receive the PDSCH in the first downlink PDSCH transmission, the base station can determine that the relative number of NACKs in the HARQ feedback information is greater than a predetermined a threshold of 80%, based on unsuccessful reception using any technical solution according to the invention. In this case, it is necessary to increase the CWS so that the CWS can be adjusted to 31. The CWS of 31 will be used in the second downlink PDSCH transmission to generate random N and perform channel sniffing.

Here, the CWS definition of a random access contention window in the unlicensed frequency band may include the following.

устанавливают CWS. Если предположить, что CWS представлен

, то

At the first stage for each service priority

install CWS. Assuming CWS is represented

, then

увеличивают для каждого приоритета обслуживания

. Здесь значение

на более высоком уровне получают из таблицы CWS (таблица CWS включает значения

на разных уровнях) в соответствии с приоритетом обслуживания и поддерживают на втором этапе. Когда относительное количество NACK в информации обратной связи HARQ не превышает 0,8, выполняют первый этап для уменьшения значения

для каждого приоритета обслуживания

до значения

на самом низком уровне в таблице CWS в соответствии с приоритетом обслуживания. Опорный подкадр к может быть первым подкадром в передаче нисходящей линии связи, ближайшим к текущему времени и переданным базовой станцией на текущей несущей, и базовая станция может ожидать получения обратной связи HARQ-ACK в этом подкадре. Кроме того, если значение

равно максимальному значению

в наборе, следующее более высокое значение CWS по прежнему равно

. Если значение

, соответствующее определенному приоритету обслуживания, регулируют подряд Q раз, а в счетчике отсрочки передачи значение CWS равно максимальному значению, то есть

, то значение

, соответствующее определенному приоритету обслуживания, устанавливают равным минимальному значению

. Значение Q выбирается базовой станцией из {1, 2, …, 8}. Причем значение Q может выбираться независимо для каждого приоритета обслуживания

.In the second step, when the relative number of NACKs in the HARQ feedback information is greater than 0.8, the value

increase for each service priority

. Here the value

at a higher level is obtained from the CWS table (the CWS table includes the values

at different levels) in accordance with the service priority and support in the second stage. When the relative number of NACKs in the HARQ feedback information does not exceed 0.8, the first step is performed to reduce the value

for each service priority

up to value

at the lowest level in the CWS table according to service priority. The reference subframe k may be the first subframe in the downlink transmission closest to the current time and transmitted by the base station on the current carrier, and the base station may expect to receive HARQ-ACK feedback in this subframe. Moreover, if the value

equal to the maximum value

in the set, the next higher CWS is still

. If the value

, corresponding to a certain service priority, is adjusted Q times in a row, and in the backoff counter, the value of CWS is equal to the maximum value, that is

, then the value

, corresponding to a certain service priority, is set equal to the minimum value

. The Q value is selected by the base station from {1, 2, ..., 8}. Moreover, the value of Q can be chosen independently for each service priority

.

In an embodiment of the invention as shown in FIG. 6, a method for determining a contention window is provided. The step of determining the relative number of NACKs in the TV-based HARQ feedback information in step S220 may include the following.

In step S410, the first amount of TV-based HARQ feedback information that has been received within a predetermined period of time is determined.

In step S420, the second NACK number is determined.

In step S430, the ratio of the second quantity to the first quantity is determined.

Here, it is assumed that there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a reference slot, and one of them returns NACK. Furthermore, suppose there are ten CBGs with HARQ feedback to be performed, and seven of them return NACK. The coefficient is set to 0.5. Then the second number of NACKs is 1*0.5+7*0.5=4. The first amount of HARQ feedback information is 2*0.5+10*0.5=6. The ratio of the second amount to the first amount is 66.7%.

In an embodiment of the invention, in step S220, said relative amount includes the first relative amount obtained based on TV-based reception feedback.

In step S230, determining the CWS random access contention window in the unlicensed frequency band based on said relative number includes: determining the CWS random access contention window in the unlicensed frequency band based on the first relative number.

Here, in an embodiment of the invention, a coefficient is determined which is used to represent the proportion of the TV-based HARQ feedback and the CBG-based HARQ feedback in the statistical result. The first relative number of returned NACKs in a time interval is determined based on said coefficient. For example, suppose there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a reference slot, and one of them returns NACK. Furthermore, suppose there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK. If the predetermined ratio is 0.5, then the first relative amount of returned NACK is (1*0.5+7*0.5)/(2*0.5+10*0.5)=66.7%. The CWS of the unlicensed random access contention window may be determined based on the first relative number.

In another embodiment of the invention, another factor may be defined that is used to represent the number of CBGs that form one TB for statistics. The coefficient can be preset. For example, suppose there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a reference slot, and one of them returns NACK. Furthermore, suppose there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK. If the predetermined ratio is 4, then the first relative amount of returned NACK is (1+7/4)/(2+10/4)=61.1%. The CWS of the unlicensed random access contention window may be determined based on the first relative number.

In addition, a specific embodiment of the invention is provided to further explain the contention window determination method of the invention. The predetermined period of time in a particular embodiment of the invention is a time interval. HARQ feedback based on TB or CBG is performed in the time domain.

Example 1 below explains a method for determining CWS based on a TV-based HARQ feedback mode.

For TV-based HARQ feedback, the second number of returned NACKs is calculated directly.

For CBG-based HARQ feedback, in one embodiment of the invention, a value is determined that is used to represent the proportion of TV-based HARQ feedback and CBG-based HARQ feedback in the statistical result. The first relative number of returned NACKs in the time interval is determined based on the value. For example, suppose there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a timeslot, and one of them returns NACK. Furthermore, suppose there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK. If the set value is 0.5, then the first relative amount of returned NACK is (1*0.5+7*0.5)/(2*0.5+10*0.5)=66.7%. The CWS adjustment method can be determined based on the first relative amount.

In another embodiment of the invention, a value is determined that is used to represent the number of CBGs forming one TB for statistics. The mentioned value can be set in advance. For example, suppose there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a timeslot, and one of them returns NACK. Furthermore, suppose there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK. If the set value is 4, then the first relative amount of returned NACK is (1+7/4)/(2+10/4)=61.1%. The CWS adjustment method can be determined based on the first relative amount.

In an example where it is desired to support both TV-based feedback and CBG-based feedback, the CWS of the unlicensed band random access contention window may be determined based on the TV-based reception feedback. Since the CWS adapts to TV-based reception feedback, it is possible to obtain a CWS more suitable for the current transmission scenario.

As shown in FIG. 7, a method for determining a contention window is provided in another embodiment of the invention. The method includes the following.

In step S710, a contention window size (CWS) of a random access contention window in the unlicensed frequency band is determined based on code block group (CBG) based reception feedback.

Here, the CBG-based receive feedback may be a CBG-based hybrid automatic repeat request (HARQ) feedback. It should be noted that in a wireless communication system, due to time-varying characteristics of a wireless channel and the effect of multipath fading, signal transmission may be disrupted, resulting in data transmission failure. To solve this problem, a HARQ mechanism is introduced in a wireless communication system. Based on the successful or unsuccessful reception of the data returned by the receiving device, the transmitting device decides whether to retransmit a data packet that has already been transmitted. In the LTE system, the data transmission time has a time dependence on the ACK/NACK feedback time. Due to the processing capability limitation of the terminal in the LTE system, referring again to FIG. 3 and taking downlink data transmission as an example, the data transmission time and the ACK/NACK feedback time have a difference of 4 ms. It should be noted that a CBG-based feedback mechanism has been introduced in the structure of the 5G NR system. That is, a single TV transmission may include multiple CBGs. The receiver may perform HARQ feedback for each CBG without performing feedback for the entire TV. Here, using the CBG-based feedback mode can reduce the number of retransmissions of the entire TV so as to reduce the loss of transmission resources due to retransmission, but can lead to an increase in control signaling. Using the TV-based feedback mode may reduce signaling overhead and control channel resources, but may result in a loss of resource for retransmission. Here, the feedback mode can be adjusted based on actual situations, so that control signaling overhead can be controlled while improving data transmission efficiency.

Here, a CBG-based receive feedback data transmission device may be a user equipment (UE), and a corresponding data reception device may be a base station. It should be noted that when the feedback data transmitting device is a UE, the corresponding data receiving device may also be a UE, for example, in all-entity-to-all-entity direct or V2X communication. Here, the CWS may be a time duration corresponding to the contention window. For example, if a time slot is taken as a unit of time, the minimum CWS can be set to 15 time slots.

In an embodiment of the invention, the CWS random access contention windows in the unlicensed frequency band may be determined based on the CBG-based reception feedback. Since the CWS adapts to the CBG-based receive feedback, it is possible to obtain a CWS more suitable for the current transmission scenario.

In one embodiment of the invention, as shown in FIG. 8, a method for determining a contention window is provided. The step of determining the CWS random access contention window in the unlicensed frequency band based on the CBG-based reception feedback in step S710 may include the following.

In step S810, CBG-based HARQ feedback information is obtained within a predetermined time period. The CBG-based HARQ feedback information includes NACKs and ACKs.

In step S820, the relative number of NACKs in the CBG-based HARQ feedback information is determined.

In step S830, CWS determines random access contention windows in the unlicensed frequency band based on said relative number.

Here, the predetermined time period may be a time period corresponding to a time interval, a symbol, a subframe, a wireless communication frame, or another configured time period.

Here, when transmitting data based on the CBG-based HARQ feedback, the data receiving device determines whether the data is received correctly. When data is received correctly, an ACK is returned. When the data is not received correctly, a NACK is returned. Here, ACK/ACK is transmitted on a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

Assuming that there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK, then the relative number of NACKs in the HARQ feedback information is 7/10=0.7.

Here, determining the CWS of a random access contention window in the unlicensed frequency band based on said relative number may include: when the relative number of NACKs in the HARQ feedback information is greater than a predetermined threshold, increasing the CWS; when the relative number of NACKs in the HARQ feedback information does not exceed a predetermined threshold, setting the CWS to a predetermined minimum value. In addition, when the number of times the CWS is kept equal to the predetermined maximum value reaches the predetermined number, the CWS is set to the predetermined minimum value. Referring to FIG. 5, again take as an example a category 4 channel discovery mechanism that performs discovery based on a free channel estimate with random backoff. The backoff counter N is generated by the wireless communication device randomly and uniformly between 0 and CWS, and listening is performed at the CCA interval level. If the channel is found to be free in the CCA interval (that is, the CCA interval is free), the backoff counter is decremented by 1. If the channel is detected to be busy in the CCA interval (that is, the CCA interval is busy), the backoff counter is suspended, that is, the backoff counter transmission remains unchanged during the busy CCA interval until the channel is found to be free. When the backoff counter shows 0, the wireless device can seize the channel immediately. In the Category 4 channel discovery mechanism, the CWS may be adjusted dynamically. The wireless communication device dynamically adjusts the CWS based on whether the previous transmission was correctly received by the receiving node. Thus, a suitable CWS can be obtained based on the link state and network load, so that a trade-off between reducing collisions between nodes and improving the efficiency of link access is achieved. Assuming that the CWS corresponding to the first transmission of the downlink PDSCH is 15, and the terminal cannot successfully receive the PDSCH in the first transmission of the downlink PDSCH, the base station can determine that the relative number of NACKs in the HARQ feedback information is greater than beforehand. predetermined threshold of 80%, based on unsuccessful reception using any technical solution according to the invention. In this case, it is necessary to increase the CWS so that the CWS can be adjusted to 31. The CWS of 31 will be used in the second transmission of the downlink PDSCH to generate random N and perform channel sniffing.

Here, the CWS definition of a random access contention window in the unlicensed frequency band may include the following.

устанавливают CWS. Если предположить, что CWS представлен

, то

. На втором этапе, когда относительное количество NACK в информации обратной связи HARQ больше 0,8, значение увеличивают для каждого приоритета обслуживания

. Здесь значение

на более высоком уровне получают из таблицы CWS (таблица CWS включает значения

на разных уровнях) в соответствии с приоритетом обслуживания и поддерживают на втором этапе. Когда относительное количество NACK в информации обратной связи HARQ не превышает 0,8, выполняют первый этап для уменьшения значения

для каждого приоритета обслуживания до

значения

на самом низком уровне в таблице CWS в соответствии с приоритетом обслуживания. Опорный подкадр к может быть первым подкадром в передаче нисходящей линии связи, ближайшим к текущему времени и переданным базовой станцией на текущей несущей, и базовая станция может ожидать приема обратной связи HARQ-ACK в этом подкадре. Кроме того, если значение

равно максимальному значению

в наборе, следующее более высокое значение CWS по-прежнему равно

. Если значение

, соответствующее определенному приоритету обслуживания, регулируют подряд Q раз, и в счетчике отсрочки передачи значение CWS равно максимальному значению, то есть

, то значение

, соответствующее определенному приоритету обслуживания, устанавливают равным минимальному значению

. Значение Q выбирается базовой станцией из {1, 2, …, 8}. Причем значение Q может выбираться независимо для каждого приоритета обслуживания

.At the first stage for each service priority

install CWS. Assuming CWS is represented

, then

. In the second step, when the relative number of NACKs in the HARQ feedback information is greater than 0.8, the value is increased for each service priority

. Here the value

at a higher level is obtained from the CWS table (the CWS table includes the values

at different levels) in accordance with the service priority and support in the second stage. When the relative number of NACKs in the HARQ feedback information does not exceed 0.8, the first step is performed to reduce the value

for each service priority up to

values

at the lowest level in the CWS table according to service priority. The reference subframe k may be the first subframe in the downlink transmission closest to the current time and transmitted by the base station on the current carrier, and the base station may expect to receive HARQ-ACK feedback in this subframe. Moreover, if the value

equal to the maximum value

in the set, the next higher CWS is still

. If the value

, corresponding to a certain service priority, is adjusted Q times in a row, and in the backoff counter, the value of CWS is equal to the maximum value, that is,

, then the value

, corresponding to a certain service priority, is set equal to the minimum value

. The Q value is selected by the base station from {1, 2, ..., 8}. Moreover, the value of Q can be chosen independently for each service priority

.

In an embodiment of the invention, as shown in FIG. 9, a method for determining a contention window is provided. The step of determining the relative number of NACKs in the CBG-based HARQ feedback information in step S820 may include the following.

In step S910, the first amount of CBG-based HARQ feedback information that has been received within a predetermined time period is determined.

In step S920, the second NACK number is determined.

In step S930, the ratio of the second quantity to the first quantity is determined.

Here, assume that there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a reference slot, and one of them returns NACK. Furthermore, suppose there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK. The coefficient is set to 0.5. Then the second number of returned NACK is 1*0.5+7*0.5=4. The first amount of HARQ feedback information is 2*0.5+10*0.5=6. The ratio of the second amount to the first amount is 66.7%.

In the embodiment, in step S820, said relative amount includes a second relative amount obtained based on the CBG-based reception feedback.

In step S830, determining the CWS random access contention window in the unlicensed frequency band based on said relative number includes: determining the CWS random access contention window in the unlicensed frequency band based on the second relative number.

Here, in an embodiment of the invention, a coefficient is determined which is used to represent the proportion of the TV-based HARQ feedback and the CBG-based HARQ feedback in the statistical result. The second relative number of returned NACKs in the reference time interval is determined based on said coefficient. For example, suppose there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a reference slot, and one of them returns NACK. Furthermore, suppose there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK. If the predetermined ratio is 0.5, then the second NACK return ratio is (1*0.5+7*0.5)/(2*0.5+10*0.5)=66.7%. The CWS of the random access contention window in the unlicensed band may be determined based on the second relative number.

In another embodiment of the invention, another factor may be defined that is used to represent the number of CBGs that form one TB for statistics. Said coefficient may be predetermined. For example, suppose there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a reference slot, and one of them returns NACK. Furthermore, suppose there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK. If the predetermined ratio is 4, then the second NACK return ratio is (1+7/4)/(2+10/4)=61.1%. The CWS of the random access contention window in the unlicensed band may be determined based on the second relative number.

In addition, a specific embodiment of the invention is provided to further explain the contention window determination method of the invention. The predetermined period of time in a particular embodiment of the invention is a time interval. HARQ feedback based on TB or CBG is performed in this time slot.

Example 2 below explains a method for determining CWS based on a CBG-based HARQ feedback mode.

Similar to example 1, for CBG-based HARQ feedback, the second number of returned NACKs is calculated directly.

For TV-based HARQ feedback, in one embodiment of the invention, a value is determined that is used to represent the proportion of TV-based HARQ feedback and CBG-based HARQ feedback in the statistical result. The second relative number of returned NACKs in the time interval is determined based on said value. For example, suppose there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a timeslot, and one of them returns NACK. Furthermore, suppose there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK. If the set value is 0.5, then the second relative amount of returned NACK is (1*0.5+7*0.5)/(2*0.5+10*0.5)=66.7%. The CWS adjustment method can be determined based on the second relative amount.

In another embodiment of the invention, a value is determined that is used to represent the number of CBGs forming one TB for statistics. Said value may be predetermined. For example, suppose there are two TV-based PDSCH transmissions having HARQ feedback to be performed in a timeslot, and one of them returns NACK. Furthermore, suppose there are ten CBGs having HARQ feedback to be performed, and seven of them return NACK. If the set value is set to 4, then the relative amount of returned NACK is (1+7/4)/(2+10/4)=61.1%. The CWS adjustment method can be determined based on said relative amount.

In an example where both TV-based feedback and CBG-based feedback are desired to be supported, the CWS of the unlicensed band random access contention window may be determined based on the CBG-based reception feedback. Since the CWS adapts to the CBG-based receive feedback, it is possible to obtain a CWS more suitable for the current transmission scenario.

As shown in FIG. 10, a method for determining a contention window is provided in another embodiment of the invention. The method includes determining a contention window size (CWS) of a random access contention window in an unlicensed frequency band based on a receive power of a predetermined reference signal.

Here, the receive power may include the receive power of a predetermined reference signal. The predetermined reference signal includes: a first type signal and a second type signal. The first type signal has a predetermined function and a random access contention window CWS determination function, and the second type signal has a random access contention window CWS determination function.

In one embodiment, assuming that the CWS corresponding to the first downlink PDSCH transmission is 15 and the reception power of the predetermined reference signal is lower than the predetermined power in the first downlink transmission, the base station sets the CWS to 30 based on this. comparisons. The CWS, which is 30, will be used in the second downlink PDSCH transmission to generate random N and perform channel sniffing.

In addition, a specific embodiment of the invention is provided to further explain the contention window determination method of the invention. The predetermined period of time in a particular embodiment of the invention is a time interval. HARQ feedback based on TB or CBG is performed in this time slot.

In Example 3, the method for determining CWS based on the measurement of the reception power of a predetermined reference signal is explained below.

In the example, a predetermined power is determined. The receive power of the predetermined reference signal in the time domain is measured and compared with the predetermined power to determine how to adjust the CWS. Here, the predetermined reference signal may be a first type signal, ie an existing signal, or may be a second type signal, ie a newly determined signal.

In an example where both TV-based feedback and CBG-based feedback are desired to be supported, the CWS of the random access contention window in the unlicensed frequency band may be determined based on the receive power of a predetermined reference signal. Since the CWS is adapted to the reception power of the predetermined reference signal, it is possible to obtain a CWS more suitable for the current transmission scenario.

Fig. 11 is a block diagram illustrating an apparatus for determining a contention window according to an embodiment of the invention. The device includes a first processing module 110 . The processing unit 110 is configured to determine a contention window size (CWS) of a random access contention window in the unlicensed frequency band based on a transmission block (TB) based reception feedback.

In an embodiment of the invention, the first processing unit 110 comprises a first acquisition unit 111, a first calculation unit 112, and a first determination unit 113.

The first acquisition unit 111 is configured to receive TV-based hybrid automatic repeat request (HARQ) feedback information within a predetermined time period, wherein the TV-based HARQ feedback information contains a no acknowledgment (NACK) identifier and acknowledgment identifier (ACK).

The first calculation unit 112 is configured to determine the relative number of NACKs in the TV-based HARQ feedback information.

The first determining unit 113 is configured to determine the CWS of a random access contention window in the unlicensed frequency band based on said relative number.

In an embodiment of the invention, the first calculation unit 112 is also configured to: determine the first amount of TV-based HARQ feedback information that has been received within a predetermined time period; determining a second number of NACKs; and determining the ratio of the second quantity to the first quantity.

In an embodiment of the invention, the first calculation unit 112 is also configured to obtain the first relative amount based on TV-based reception feedback. Determining the CWS random access contention window in the unlicensed frequency band based on the relative number includes: determining the CWS random access contention window in the unlicensed frequency band based on the first relative number.

As shown in FIG. 12, an apparatus for determining a contention window is provided in an embodiment of the invention. The device includes a second processing module 120. The second processing unit 120 is configured to determine a contention window size (CWS) of a random access contention window in the unlicensed frequency band based on code block group (CBG) based reception feedback.

In an embodiment of the invention, the second processing unit 120 comprises a second acquisition unit 121, a second calculation unit 122, and a second determination unit 123.

The second acquisition unit 121 is configured to receive CBG-based hybrid automatic repeat request (HARQ) feedback information within a predetermined time period, wherein the CBG-based HARQ feedback information contains a no acknowledgment (NACK) identifier and acknowledgment identifier (ACK).

The second calculation unit 122 is configured to determine the relative number of NACK identifiers in the CBG-based HARQ feedback information.

The second determining unit 123 is configured to determine the CWS of a random access contention window in the unlicensed frequency band based on said relative number.

In one embodiment of the invention, the second calculation unit 122 is also configured to: determine a first amount of CBG-based HARQ feedback information that has been received within a predetermined time period; determining a second number of NACKs; and determining the ratio of the second quantity to the first quantity.

In an embodiment of the invention, the second calculator 122 is also configured to obtain a second relative amount based on the CBG-based reception feedback. Determining the CWS random access contention window in the unlicensed frequency band based on said relative number includes: determining the CWS random access contention window in the unlicensed frequency band based on the second relative number.

As shown in FIG. 13, an apparatus for determining a contention window is provided in an embodiment of the invention. The device includes a third processing module 130 . The third processing unit 130 is configured to determine a contention window size (CWS) of a random access contention window in the unlicensed frequency band based on the reception power of a predetermined reference signal.

In an embodiment of the invention, the third processing unit 130 includes a measurement unit 131, a comparison unit 132, and a third determination unit 133.

The measurement unit 131 is configured to measure the reception power of a predetermined reference signal for a predetermined period of time.

The comparator 132 is configured to compare the receive power with a predetermined power to obtain a comparison result.

The third determining unit 133 is configured to determine the CWS random access contention window in the unlicensed frequency band based on the result of the comparison.

In an embodiment of the invention, the third processing unit 133 is configured to configure a predetermined reference signal such that it contains a first type signal and a second type signal. The first type signal has a predetermined function and a random access contention window CWS determination function, and the second type signal has a random access contention window CWS determination function.

An embodiment of the invention also provides a communication device. The communication device includes an antenna, a memory and a processor. The processor is coupled to the antenna and memory, respectively, and configured to execute executable programs stored in the memory, control the antenna to receive and transmit signals, and implement the contention window determination method in accordance with any of the above embodiments.

The communication device provided in the embodiment of the invention may be a terminal or a base station as described above. The terminal may be any of various human-carried or vehicle-mounted terminals. The base station may be any of various types of base stations, such as a 4G base station, a 5G base station, and so on.

The antenna can be selected from various types of antennas, such as a mobile device antenna such as a 3G antenna, a 4G antenna, a 5G antenna, and so on. The antenna may also include a Wi-Fi antenna, a wireless powered antenna, etc.

The memory may include various types of storage media. The storage medium may be a permanent computer storage medium and is capable of retaining information stored thereon after the communication device is turned off.

The processor may be connected to the antenna and memory via a bus and configured to read executable programs stored in memory, for example, in at least one of the ways shown in figure 2, figure 4, figure 6, figure 7, figure. 8, fig. 9 and fig. 10.

An embodiment of the invention also provides a computer-readable storage medium on which executable programs are stored. When executable programs are executed by the processor, the steps of the contention window determination method according to any of the previous embodiments of the invention, for example, one of the methods illustrated in FIG. 2, FIG. 4, FIG. 6, FIG. 7, FIG. 8, FIG. 9 and 10.

Fig. 14 is a block diagram illustrating a terminal 800 according to an embodiment of the invention. For example, terminal 800 may be a mobile phone, computer, digital broadcast terminal, messaging device, game console, tablet device, medical equipment, exercise machine, personal digital assistant.

As shown in FIG. 14, terminal 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, measurement component 814 and a communication component 816.

The processing component 802 typically controls the entire operation of the terminal 800, such as operations related to display, phone call, data transmission, camera operation, and recording operation. Processing component 802 may include one or more processors 820 for executing instructions for performing all or part of the steps of the method described above. In addition, the processing component 802 may include one or more modules to facilitate interoperability between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate communication between the multimedia component 808 and the processing component 802.

Memory 804 is configured to store all types of data to support operation of terminal 800. Examples of data include instructions for any applications or methods used on terminal 800, contact data, phone book data, messages, images, videos, and so on. Memory 804 can be implemented by any type of temporary or permanent storage devices, or a combination thereof, such as static random access memory (SRAM, static random access memory), electrically erasable programmable read-only memory (EEPROM, electrically erasable programmable read-only memory), electrically programmable permanent memory (EPROM, electrically programmable read-only memory), programmable read-only memory (PROM, programmable read-only memory), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

Power component 806 may provide power to all components of terminal 800. Power component 806 may include a power management system, one or more power supplies, and other blocks associated with generating, controlling, and distributing power at terminal 800.

The media component 808 includes an output interface screen provided between the device 1100 and the user. In some embodiments of the invention, the screen may include a liquid crystal display (LCD, liquid crystal display) and a touch panel (TP, touch panel). When the screen includes TP, the screen may be implemented as a touch screen to receive input from a user. The touchpad includes one or more touch sensors for detecting touch, swipe, and gestures on the touchpad. The touch sensor can not only determine the touch or slide action limit, but also can determine the duration and pressure associated with the touch or slide operation. In some embodiments, media component 808 includes a front camera and/or a rear camera. When the terminal 800 is in an operating mode such as a photo mode or a video mode, the front camera or the rear camera can receive external media data. Both the front camera and the rear camera can be a fixed optical lens system or an optical lens system with a focal length and optical zoom capability.

The audio component 810 is configured to output and/or input an audio signal. For example, audio component 810 includes a microphone (MIC). When the terminal 800 is in an operating mode such as calling mode, recording mode, and speech recognition mode, the microphone is configured to receive an external audio signal. The received audio signal may be further stored in the memory 804 or transmitted via the communication component 816 . In some embodiments of the invention, the audio component 810 also includes a speaker configured to output an audio signal.

The input/output interface 812 provides an interface for the processing component 802 and the peripheral interface module, and the peripheral interface module may be a keyboard, a control wheel, a button, and so on. The button may include, but is not limited to, a home button, a volume button, a start button, and a lock button.

Measurement component 814 includes one or more sensors configured to provide various aspects of estimating the state of terminal 800. For example, measurement component 814 can detect the on/off state of terminal 800 and the relative position of the component. For example, the component is a display and keyboard of terminal 800. Measuring component 814 can also detect a change in the location of terminal 800 or a component of terminal 800, the presence or absence of contact between a user and terminal 800, the orientation or acceleration/deceleration of terminal 800, and a change in temperature of terminal 800. component 814 may include a proximity sensor configured to detect the presence of nearby objects without physically contacting them. The measurement component 814 may also include an illumination sensor, such as a CMOS or CCD image sensor, that is configured for use in imaging applications. In some embodiments of the invention, the measurement component 814 may also include an acceleration sensor, a gyro sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 816 is configured to provide wired or wireless communication between terminal 800 and other devices. Terminal 800 may access wireless networks based on a communication standard such as WiFi, 2G, or 3G, or combinations thereof. In an embodiment of the invention, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast control system via a broadcast channel. In an embodiment of the invention, communication component 816 also includes a near field communication (NFC) wireless communication module for providing short-range communications. For example, the NFC module may be implemented based on RFID technology, IrDA technology, UWB technology, BT technology, and other technologies.

In an embodiment, terminal 800 may be implemented using one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components that are configured to perform the methods described above.

An embodiment of the invention also provides a computer-readable storage medium containing instructions, such as a memory 804 containing instructions that can be executed by the processor 820 of the terminal 800 to perform the methods described above. For example, the computer-readable storage medium may be ROM memory, random access memory (RAM), compact disc, magnetic tape, floppy disk, optical storage device, and so on.

The terminal may be configured to implement the contention window determination method described above, for example, the contention window determination method shown in FIG. 2, FIG. 4, FIG. 6, FIG. 8, FIG. 9, and FIG. 10.

Fig. 15 is a block diagram illustrating a base station according to an embodiment of the invention. Base station 900 may be provided as a network device. As shown in FIG. 15, base station 900 includes a processing component 922, which also includes one or more processors, and a memory resource represented by memory 932 for storing instructions that can be executed by processing component 922, such as an application program. An application program stored in memory 932 may include one or more modules, each of which corresponds to a set of instructions. Further, the processing component 922 is configured to execute instructions for performing the contention window determination method described above, for example, the contention window determination method shown in FIG. 2, FIG. 4, FIG. 6, FIG. 8, FIG. 9, and FIG. 10.

The base station 900 may also include a power component 926 configured to power the base station 900, a wired or wireless network interface 950 configured to connect the base station 900 to a network, and an input/output (I/O) interface 958. Base station 900 may operate on an operating system stored in memory 932, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, and the like.

The wireless network interface 950 includes, but is not limited to, the antenna of the communication device described above.

Those skilled in the art will appreciate other embodiments of the present invention after considering the description and practice of the present invention. This application is intended to cover any variations, examples of use, or adaptive variations of the present invention. These variations, use cases, or adaptive changes follow the general principles of the present invention and include well-known or conventional techniques in the art that are not described herein. The description and embodiments of the invention are considered as examples only, and the scope and spirit of the present invention are defined by the appended claims.

It should be understood that the present invention is not limited to the precise construction as described above and shown in the drawings, and various modifications and changes may be made within the scope of the invention. The scope of the present invention is defined only by the appended claims.

Claims (46)

1. A method for determining the competition window, characterized in that it includes: receiving (S210) hybrid automatic repeat request (HARQ) feedback information based on transmission block (TB) within a predetermined time period, wherein the TB-based HARQ feedback information contains a non-acknowledgment identifier (NACK) and an acknowledgment identifier (ACK); determining (S220) a relative number of NACKs in the TV-based HARQ feedback information, and determining (S230) a contention window size (CWS) of a random access contention window in the unlicensed frequency band based on said relative number; wherein said relative amount is determined based on a coefficient used to represent the proportion of TB-based HARQ feedback and Code Block Group (CBG)-based HARQ feedback in a statistical result. 2. The method according to claim 1, characterized in that the method also includes: determining (S410) a first amount of HARQ feedback information based on TB that has been received within a predetermined period of time; determining (S420) a second number of NACK IDs; and determining (S430) the ratio of the second amount to the first amount. 3. The method of claim 1 or 2, wherein said relative amount includes a first relative amount derived from TV-based HARQ feedback information. 4. The method according to claim 3, characterized in that the method also includes: determining a CWS random access contention window in the unlicensed frequency band based on the first relative number. 5. Method for determining the competition window, characterized in that it includes: receiving (S801) hybrid automatic repeat request (HARQ) feedback information based on code block group (CBG) within a predetermined time period, wherein the CBG-based HARQ feedback information contains a no acknowledgment identifier (NACK ) and an acknowledgment identifier (ACK); determining (S820) the relative number of NACKs in the CBG-based HARQ feedback information, and determining (S830) a contention window size (CWS) of a random access contention window in the unlicensed frequency band based on said relative number; wherein said relative amount is determined based on a factor used to represent the proportion of HARQ feedback based on transmission block (TB) and HARQ feedback based on CBG in a statistical result. 6. The method according to claim 5, characterized in that the method also includes: determining (S910) a first amount of CBG-based HARQ feedback information that has been received within a predetermined time period; determining (S920) the second number of NACKs; and determining (S930) the ratio of the second amount to the first amount. 7. The method according to claim 5 or 6, wherein said relative amount includes a second relative amount derived from CBG-based HARQ feedback information. 8. The method according to claim 7, characterized in that the method also includes: determining a CWS random access contention window in the unlicensed frequency band based on the second relative number. 9. Communication device, characterized in that it contains: processor and a computer-readable storage medium that stores a program executable by a processor and includes instructions for: receiving hybrid automatic repeat request (HARQ) feedback based on transmission block (TB) within a predetermined period of time, wherein the TB based HARQ feedback information contains a non-acknowledgment identifier (NACK) and an acknowledgment identifier receive (ACK); determining the relative amount of NACK in the HARQ feedback information based on the TV; and determining a contention window size (CWS) of a random access contention window in the unlicensed frequency band based on said relative number; wherein said relative amount is determined based on a coefficient used to represent the proportion of TB-based HARQ feedback and Code Block Group (CBG)-based HARQ feedback in a statistical result. 10. Communication device, characterized in that it contains: processor and a computer-readable storage medium that stores a program executable by a processor and includes instructions for: receiving Hybrid Automatic Repeat Request (HARQ) feedback based on Code Block Group (CBG) within a predetermined time period, wherein the CBG-based HARQ feedback information contains a No Acknowledgment (NACK) ID and a acknowledgment of receipt (ACK); determining a relative amount of NACK in the CBG-based HARQ feedback information; and determining a contention window size (CWS) of a random access contention window in the unlicensed frequency band based on said relative number; wherein said relative amount is determined based on a factor used to represent the proportion of HARQ feedback based on transmission block (TB) and HARQ feedback based on CBG in the statistical result. 11. The device according to claim 10, characterized in that the program includes instructions for: determining a first amount of CBG-based HARQ feedback information that has been received within a predetermined time period; determining a second number of NACKs; and determining the ratio of the second quantity to the first quantity. 12. The apparatus of claim 10, wherein said relative amount includes a second relative amount derived from CBG-based HARQ feedback information. 13. The device according to claim 12, characterized in that the program includes instructions for: determining a CWS random access contention window in the unlicensed frequency band based on the second relative number. 14. A computer-readable storage medium that stores instructions executable by the processor, characterized in that the instructions executable by the processor, when executed, provide for the implementation of the method according to any one of claims 1 to 8.

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