WO2021093196A1

WO2021093196A1 - Method and device for multiplexing radio resources

Info

Publication number: WO2021093196A1
Application number: PCT/CN2020/074716
Authority: WO
Inventors: Xing Liu; Peng Hao; Jing Shi; Ling Yang
Original assignee: Zte Corporation
Priority date: 2020-02-11
Filing date: 2020-02-11
Publication date: 2021-05-20
Also published as: CN115088361A

Abstract

This disclosure relates to method and system for multiplexing radio resources in shared radio spectrum. In one implementation, the method may include obtaining a resource scheduling message for an uplink transmission, which comprises an indication of a scheduled transmission resource and a transmission parameter. The method may include determining, based on the transmission parameter, a channel detection mechanism. The method may further include utilizing the determined channel detection mechanism to detect the scheduled transmission resource.

Description

METHOD AND DEVICE FOR MULTIPLEXING RADIO RESOURCES

TECHNICAL FIELD

This disclosure is directed generally to wireless communications and particularly to multiplexing radio resources in shared spectrum.

BACKGROUND

In a wireless communication network such as 5G new radio (NR) network, the communication technique is dedicated to provide higher transmission rate, massive links, ultra-low latency, higher transmission reliability, as well as hundredfold power efficiency to support evolving various communication demands. Where the uplink transmissions with different transmission priorities coexist within a cell, the communication technique adopts uplink (UL) inter-user equipment (inter-UE) multiplexing to ensure the transmission performance of the uplink transmission with higher transmission priority. However, when the uplink transmissions are performed in the shared spectrum, which is also called unlicensed spectrum, the UL inter-UE multiplexing fails to guarantee that the uplink transmission with higher transmission priority would seize the corresponding transmission resources.

SUMMARY

This disclosure is directed to methods, systems, and devices related to wireless communication, and more specifically, for multiplexing radio resources in shared radio frequency to ensure the uplink transmission with higher priority.

In one embodiment, a method for inter-UE multiplexing by a user equipment is disclosed. The method may include obtaining a resource scheduling message for an uplink transmission. The resource scheduling message may include an indication of a scheduled transmission resource and a transmission parameter. The method may further include determining, based on the transmission parameter, a channel detection mechanism. The method may further include utilizing the determined channel detection mechanism to detect the scheduled transmission resource.

In another embodiment, a device for wireless communication may include a memory storing instructions and a processing circuitry in communication with the memory. When the processing circuitry executes the instructions, the processing circuitry is configured to carry out the above method.

In another embodiment, a computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the above method.

The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims below.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example diagram of a wireless communication network in accordance with various embodiments.

FIG. 2 illustrates an example of uplink inter-UE multiplexing.

FIG. 3 illustrates another example of uplink inter-UE multiplexing.

FIG. 4 illustrates a flow diagram of a method for multiplexing radio resources in accordance with an embodiment.

FIG. 5 illustrates another example of uplink inter-UE multiplexing within a channel occupancy time region.

DETAILED DESCRIPTION

The technology and examples of implementations and/or embodiments in this disclosure can be used to improve performance in wireless communication systems. The term “exemplary” is used to mean “an example of” and unless otherwise stated, does not imply an ideal or preferred example, implementation, or embodiment. Please note that the implementations may, however, be embodied in a variety of different forms and, therefore, the covered or claimed subject matter is intended to be construed as not being limited to any of the embodiments to be set forth below. Please also note that the implementations may be embodied as methods, devices, components, or systems. Accordingly, embodiments of this disclosure may, for example, take the form of hardware, software, firmware or any combination thereof.

A wireless access network provides network connectivity between a user equipment and an information or data network such as a voice or video communication network, the Internet, and the like. An example wireless access network may be based on cellular technologies, which may further be based on, for example, 5G NR technologies and/or formats. FIG. 1 shows an example system diagram of wireless communication network 100 including

UEs

102 and 124 as well as a wireless access network node (WANN) 104 according to various embodiments. The UEs 102 and 124 may include but is not limited to a mobile phone, smartphone, tablet, laptop computer, a smart electronics or appliance including an air conditioner, a television, a refrigerator, an oven and the like, or other devices that are capable of communicating wirelessly over a network. Take the UE 102 as example, it may include transceiver circuitry 106 coupled to an antenna 108 to effect wireless communication with the wireless access network node 104. The transceiver circuitry 106 may also be coupled to a processor 110, which may also be coupled to a memory 112 or other storage devices. The memory 112 may store therein instructions or code that, when read and executed by the processor 110, cause the processor 110 to implement various ones of the methods described herein.

Similarly, the wireless access network node 104 may comprise a base station or other wireless network access points capable of communicating wirelessly over a network with one or more UEs. For example, the wireless access network node 104 may comprise a 5G NR base station, a 5G central-unit base station, or a 5G distributed-unit base station. Each type of these wireless access network nodes may be configured to perform a corresponding set of wireless network functions. The set of wireless network functions between different types of wireless access network nodes may not be identical. The set of wireless network functions between different types of wireless access network nodes, however, may functionally overlap. The wireless access network node 104 may include transceiver circuitry 114 coupled to an antenna 116, which may include an antenna tower 118 in various approaches, to effect wireless communication with the UE 102. The transceiver circuitry 114 may also be coupled to one or more processors 120, which may also be coupled to a memory 122 or other storage devices. The memory 122 may store therein instructions or code that, when read and executed by the processor 120, cause the processor 120 to implement various ones of the methods described herein.

For simplicity and clarity, only one WANN and two UEs are shown in the wireless communication network 100. It will be appreciated that one or more WANNs may exist in the wireless communication network, and each WANN may serve one or more UEs in the meantime. Besides UEs and WANNs, the network 100 may further comprise any other network nodes with different functions such as the network nodes in core network of the wireless communication network 100. In addition, while various embodiments will be discussed in the context of the particular example wireless communication network 100, the underlying principle applies to other applicable wireless communication networks.

The uplink inter-UE multiplexing may include two implementation mechanisms: uplink cancelation and uplink power control, which will be described with reference to FIGs. 2 and 3.

FIG. 2 illustrates a typical application scenario of uplink cancelation mechanism. For example, the UE 102 has an uplink transmission request for Ultra-Reliable Low-Latency Communication (URLLC) and the UE 124 has an uplink transmission request for Enhanced Mobile Broadband (eMBB) communication. The URLLC transmission has a higher priority than the eMBB transmission. As shown in FIG. 2, the UE 102 transmits a scheduling request 2 (SR2) to the WANN 104. Upon receiving the SR2 for a URLLC transmission, the WANN 104 needs to schedule uplink transmission resources for the transmission promptly and allocate the scheduled resources to the UE 102 via the UL grant 2. However, as shown in FIG. 2, some of the target transmission resources scheduled for the UE 102 has been allocated to the UE 124 for the eMBB transmission via the UL grant 1. To ensure the transmission of the URLLC timely, the UL cancelation mechanism utilizes an uplink cancelation indication (UL CL) to cancel the transmission of the eMBB on the target transmission resources. The lower priority uplink transmissions that can be canceled may further include sounding reference signal (SRS) .

FIG. 3 illustrates a typical application scenario of uplink power control mechanism. Similarly, the UE 102 has an uplink transmission request for URLLC and the UE 124 has an uplink transmission request for eMBB communication. The target transmission resources scheduled for the UE 102 partially overlaps with those scheduled for the UE 124. As such, the uplink power control mechanism introduces an open-loop power control parameter set indicator field in the UL grant corresponding to the URLLC transmission scheduling, which indicates to the UE 102 to enhance transmission power for the URLLC transmission to guarantee the transmission performance.

The wireless communication system such as 5G may take the shared spectrum (also referred to as un-authorized frequency bands) as potential working spectrum resources. Network devices such as UE and WANN working on the shared spectrum are required to access the transmission channel in the manner of Listen before Talk (LBT) , also referred to as channel sensing or channel detection. That is, the network devices first need to detect the channel, and then occupy the channel for transmission only when meeting a channel access condition.

In the shared spectrum, the UL inter-UE multiplexing does not work well as expected. Specifically, under the UL cancelation mechanism, although the lower priority uplink transmission is canceled according to the UL CL indication, there is still risk that the higher priority uplink transmission fails to seize the target transmission resources. This is opposed to the original intention of sacrificing the lower priority transmission to ensure the higher priority transmission. Under the UL power control mechanism, where there is resource conflict between two uplink transmissions, the uplink transmission with lower priority will not be canceled. Meanwhile, due to the LBT requirement, a UE has to perform a channel detection before uplink transmission. In the case that the lower priority uplink transmission is taking place on the target resource channel, the UE will detect that the target resource channel is not idle and the channel access condition is not satisfied. As a result, the UE cannot perform the higher priority uplink transmission on the target resource channel.

One of the objectives of the present disclosure is to improve the UL inter-UE multiplexing so as to increase the likelihood that the uplink transmission with higher priority preempts the target resources in the shared spectrum.

FIG. 4 illustrates an exemplary implementation 400 for multiplexing radio resources. At step 410, the UE 102 may obtain a resource scheduling message for an uplink transmission from the WANN 104. As an example, the resource scheduling message may be an uplink grant and comprise an identification of a scheduled transmission resource and a transmission parameter. The scheduled transmission resource may belong to a shared radio frequency transmission band. The transmission parameter may include, for example, a downlink control information (DCI) type, a priority indicator, a ChannelAccess-CPext-CAP, a cancel indicator field an uplink transmission channel indicator and other applicable data and fields indicating the priority of the uplink transmission, which will be described further by way of examples later.

At step 420, the UE 102 may determine, based on the transmission parameter, a channel detection mechanism. The channel detection mechanism may include a type-1 channel detection or a type-2 channel detection.

As an example, the type-1 channel detection may be a random backoff channel detection, in which a backoff number is randomly selected as per a predetermined rule. Whenever a channel detection is executed, if the channel is idle, the backoff number value will be minus one. When the backoff number value is equal to zero, the condition to occupy the channel is satisfied. The type-1 channel detection may be predetermined, indicated in a radio resource control (RRC) signaling, or indicated in a downlink control information (e.g., uplink grant) .

By contrast, when the UE 102 may access the channel in a shared manner, the type-2 channel detection can be used. The shared manner may represent hat the UE 102 may occupy the target transmission resources within the shared resources acquired by other devices such as UEs or WANNs by executing a simplified channel such as type-2 channel detection. In some implementations, the type-2 channel detection may include performing a designated time-duration channel detection once, for example, 25-μs-duration channel detection and 16-μs-duration channel detection. The length of the time duration may be predefined or configured by the WANN 104. Alternatively, the type-2 channel detection may include not performing channel detection.

In some implementations, the transmission parameter may be a DCI type field defined in the uplink grant received from the WANN 104. For example, where the value of the DCI type field is 1, the UE 102 may select the type-2 channel detection to occupy the scheduled transmission resource. Where the value of the DCI type field is 0, the UE 102 may select the type-1 channel detection to occupy the scheduled transmission resource.

Alternatively or additionally, the transmission parameter may be a cancel indicator field, included in the uplink grant, indicating whether scheduling the uplink transmission involves cancellation of another uplink transmission. If the currently scheduled uplink transmission resources are vacated by canceling other uplink transmission traffic, the UE 102 may select the type-2 channel detection to occupy the scheduled transmission resource. Otherwise, the UE 102 may select the type-1 channel detection to occupy the scheduled transmission resource.

Alternatively or additionally, the transmission parameter may be a priority indicator field in the uplink grant received from the WANN 104. Where the field indicates the uplink transmission has a higher transmission priority, the UE 102 may select the type-2 channel detection to occupy the scheduled transmission resource. Otherwise, the UE 102 may select the type-1 channel detection to occupy the scheduled transmission resource.

Alternatively or additionally, the transmission parameter may be a ChannelAccess-CPext-CAP field in the uplink grant received from the WAN 104. Where the LBT type indicated in the field belongs to simplified channel detection, the UE 102 may select the type-2 channel detection to occupy the scheduled transmission resource. Otherwise, the UE 102 may select the type-1 channel detection to occupy the scheduled transmission resource.

Alternatively or additionally, the transmission parameter may be an uplink transmission resource indicator field indicating the time domain resource scheduled for the uplink transmission and/or the frequency domain resource scheduled for the uplink transmission, the UE judges whether the scheduled transmission resource included in the uplink grant falls within a channel occupancy time (COT) region. The COT region may represent time-frequency resources that the WANN 104 occupies within the shared radio frequency transmission band as shown in FIG. 5.

The UE 102 may obtain the uplink transmission resources by sharing the downlink transmission resources of the WANN 104. In particular, the WANN 104 may occupy a transmission channel in the shared radio frequency transmission band after executing a designated channel detection and meeting a predetermined channel access condition. The resource range of the occupied transmission channel is referred to as the COT. As shown in FIG. 5, the WANN 104 may simply use a portion of transmission resources in the COT for its downlink transmission, and thus the remaining transmission resources may be shared with the UEs served by the WANN 104 including the UE 102. As an example, the range of the COT may be represented by DCI format 2_0, which includes the COT duration and information of the available resource block (RB) set included in the COT.

By way of example, the COT is described above in the context of the wireless access network node such as the WANN 104. It should be appreciated that the COT region may also represent time-frequency resources that another UE occupies within the shared spectrum band. As such, the UE 102 may obtain the uplink transmission resources by sharing the spare transmission resources of the another UE.

Where the transmission channel scheduled for the uplink transmission of the UE 102 falls within the COT region, the UE 102 may select to occupy the scheduled transmission resource in a type-2 channel detection. Otherwise, the UE 102 may select to occupy the scheduled transmission resource in a type-1 channel detection.

Various transmission parameters are respectively discussed above to be used to determine the type of channel detection to occupy the scheduled transmission resource. It should be appreciated that these transmission parameters can also be used in combination to serve the function. For example, the UE 102 may select the type-2 channel detection to occupy the scheduled transmission resource only when the scheduled transmission resource falls within the COT region and the priority indicator indicates that the uplink transmission has a higher priority.

Alternatively or additionally, where the UL inter-UE multiplexing works under the UL power control mechanism, the transmission parameter may include a power control indicator indicating whether to perform the uplink transmission with improved transmission power due to resource multiplexing with UL transmission.

As an example, the power control indicator may be an open-loop power control parameter set indication (OLPI) field in the uplink grant. Specifically, when the OLPI field indicates that the open-loop power control parameter comes from the open-loop power control parameter set list configured in the RRC parameter P0-PUSCH-Set, which indicates that the uplink transmission will be performed with the improved transmission power, the UE 102 may select the type-2 channel detection to occupy the scheduled transmission resource. Otherwise, the UE 102 may select the type-1 channel detection to occupy the scheduled transmission resource.

Typically, the WANN 104 may configure two open-loop power control parameter set lists using the RRC parameters P0-PUSCH-Set and P0-PUSCH-AlphaSet. P0-PUSCH-Set includes one or more P0 values, which are applicable to configure the open-loop power control parameter for UL inter-UE multiplexing, i.e., resource multiplexing with other UL transmission. P0-PUSCH-AlphaSet includes one or more groups of {P0, alpha} values, which are applicable to configure the open-loop power control parameter for non UL inter-UE multiplexing. Both P0 and alpha may be used to determine the open-loop power control parameter of transmission power. P0 represents the target received power and alpha represents compensation coefficient of the transmission path loss. The OLPI field is used to indicate which open-loop power control parameter set list will be selected to determine the transmission power for the uplink transmission traffic.

Returning to FIG. 1, at step 430, the UE 102 may utilize the detection mechanism determined at step 420 to detect the scheduled transmission resource. If the scheduled transmission resource is detected to meet the channel access conditions, the UE 102 may occupy the scheduled transmission resource to perform the uplink transmission.

In some implementations, where the UL inter-UE multiplexing applied to shared radio frequency transmission band is working under the UL power control mechanism, the WAN 104 may configure two power detection thresholds for the UE 102, power_threshold_1 and power_threshold_2. The power_threshold_2 is higher than the power_threshold_1. The UE 102 may determine which power detection threshold will be used in the channel detection for the uplink transmission based on, for example, the OLPI field in the uplink grant scheduling the uplink transmission.

Specifically, when the OLPI field indicates that the open-loop power control parameter comes from the open-loop power control parameter set list configured in the RRC parameter P0-PUSCH-Set, which means that the uplink transmission will be performed with improved transmission power due to resource multiplexing with other UL transmission, the UE 102 may utilize a higher power threshold, i.e. the power_threshold_2, to detect ongoing transmission on the scheduled transmission resource. In this way, although the scheduled transmission resource is being used for a transmission traffic, if the transmission power of the transmission traffic is lower than the power_threshold_2, the UE 102 may determine that the scheduled transmission resource is not occupied and be qualified to perform the uplink transmission on the scheduled transmission resource. By contrast, if the UE 102 determine to perform the uplink transmission without improved transmission power, it may utilize the power_threshold_1 to detect ongoing transmission on the scheduled transmission resource.

Various methods can be used to configure the two power detection threshold. For example, the WANN 104 may configure two parameters via the RRC signaling, Threshold (e.g. maxEnergyDetectionThreshold-r14) and Threshold offset (e.g. energyDetectionThresholdOffset-r14) . The power_threshold_1 is equal to Threshold, and the power_threshold_2 is equal to Threshold plus Threshold offset.

Alternatively, the WANN 104 may configure only parameter Threshold offset (e.g. energyDetectionThresholdOffset-r14) via the RRC signaling. The power_threshold_1 may be calculated according to a predetermined equation. The power_threshold_2 may be equal to Threshold offset plus power_threshold_1.

Alternatively, the WANN 104 may configure the parameter Threshold offset (e.g. energyDetectionThresholdOffset-r14) via the RRC signaling. The power_threshold_2 may be equal to Threshold offset plus power_threshold_1. If the WANN 104 further configures the parameter Threshold (e.g. maxEnergyDetectionThreshold-r14) , the power_threshold_1 may be equal to Threshold. Otherwise, the power_threshold_1 may be calculated according to a predetermined equation.

Alternatively, the WANN 104 may configure the parameter energyDetectionThresholdOffset via the DCI. The power_threshold_2 may be equal to energyDetectionThresholdOffset plus power_threshold_1. If the WANN 104 further configures the parameter Threshold (e.g. maxEnergyDetectionThreshold-r14) via the RRC signaling, the power_threshold_1 may be equal to Threshold. Otherwise, the power_threshold_1 may be calculated according to a predetermined equation.

Alternatively, the WANN 104 may configure the value of the power_threshold_2 via the DCI. If the WANN 104 configures the parameter Threshold (e.g. maxEnergyDetectionThreshold-r14) via the RRC signaling, the power_threshold_1 may be equal to the Threshold. Otherwise, the power_threshold_1 may be calculated according to a predetermined equation.

Optionally, before determining the channel detection mechanism to occupy the scheduled transmission resource selected between a type-2 channel detection and type-1 channel detection at step 420, the UE 102 may determine whether the scheduled transmission resource has transmission from another wireless communication system or cell. If the UE 102 determines that the scheduled transmission resource is transmitting a traffic for the other wireless communication system or cell, the UE 102 may directly select the type-1 channel detection to occupy the scheduled transmission resource. Otherwise, the UE 102 may determine the channel detection mechanism based on the transmission parameter as discussed above with reference to step 420 in FIG. 4.

The other wireless communication system or cell may refer to a wireless communication network employing a communication technique or standard different than the wireless communication network 100. The UE 102 may determine whether a traffic of the other system or cell is being transmitted using the target resources by, for example, checking the pattern designated for transmission resource mapping. The traffic of the system or cell generally makes use of the same pattern, for example, avoiding to map data to a specific resource element (RE) . As such, the UE 102 may detect the transmission power of the specific RE. Where the detected transmission power is higher than a predefined threshold, the UE 102 may determine the existence of the heterogeneous system or cell traffic.

Optionally, the UE 102 may transmit a channel occupancy information to the WANN 104. The channel occupancy information may indicate whether the UE 102 is able to seize the target transmission resources. The target transmission resources may be preconfigured to the UE 102 by the WANN 104, for example, via a RRC signaling, a DCI, or a medium access control control element (MAC CE) .

In some implementations, the channel occupancy information may be indicated in the scheduling request (SR) . For example, two SR sequences are defined, SR sequence 1 and SR sequence 2. SR sequence 1 may represent the UE 102 is able to seize the target resources. SR sequence 2 may represent that the UE 102 is unable to seize the target resources, or not sure if it is able to seize the target resources. The UE 102 may transmit the corresponding SR sequence as the channel occupancy information.

Alternatively, two SR frequency domain locations are defined. For example, SR spectrum location 1 may represent the UE 102 is able to seize the target resources. SR spectrum location 2 may represent that the UE 102 is unable to seize the target resources, or not sure if it is able to seize the target resources. The UE 102 may transmit the corresponding SR frequency location as the channel occupancy information.

Alternatively, two SR time domain location are defined. For example, SR time domain location 1 may represent the UE 102 is able to seize the target resources. SR time domain location 2 may represent that the UE 102 is unable to seize the target resources, or not sure if it is able to seize the target resources. The UE 102 may transmit the corresponding SR time domain location as the channel occupancy information.

Alternatively, two SR time-frequency domain locations are defined. For example, SR time-frequency domain location 1 may represent the UE 102 is able to seize the target resources. SR time-frequency domain location 2 may represent that the UE 102 is unable to seize the target resources, or not sure if it is able to seize the target resources. The UE 102 may transmit the corresponding SR time-frequency domain location as the channel occupancy information.

Alternatively, it may be regulated that, as long as the UE 102 transmits a SR, it indicates that the UE 102 is able to seize the target resources.

When the channel occupancy information indicates that the UE 102 is able to seize the target resources, the WANN 104 may transmit an uplink grant 1 to the UE 102 to provide the transmission parameters for the uplink transmission using the target resources. Optionally, the uplink grant 1 may not include at least one of time domain resource allocation indicator field and frequency domain resource allocation indicator field.

Optionally, where the target resources are allocated to an uplink transmission with lower transmission priority, the WANN 104 may transmit a UL Cl to cancel the transmission of the lower priority traffic on the target resources. Alternatively, the WANN 104 may instruct the UE 102 to improve transmission power for it uplink transmission in the uplink grant 1.

When the channel occupancy information indicates that the UE 102 is unable to seize the target resources, the WANN 104 may transmit an uplink grant 2 to allocate new transmission resources for the uplink transmission of the UE 102.

Various embodiments are discussed above to implement the UL inter-UE multiplexing in the shared spectrum. Multiple conditions are defined for the UE to determine whether it is able to share the transmission resources of other network devices such as UE and WANN. Where the defined conditions are satisfied, the UE may occupy the target transmission channel in a shared manner for its high priority uplink transmission, which increase the likelihood that the high priority uplink transmission may seize the target transmission channel. In this way, it alleviates the risk that, although the low priority uplink transmission is canceled, the high priority uplink transmission still cannot occupy the target transmission channel due to the failure to compete the transmission resource. As a result, the network system overall resource efficiency and the reliability of the transmission for high priority traffic can be guaranteed.

Throughout the specification and claims, terms may have nuanced meanings suggested or implied in context beyond an explicitly stated meaning. Likewise, the phrase “in one embodiment/implementation” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment/implementation” as used herein does not necessarily refer to a different embodiment. It is intended, for example, that claimed subject matter includes combinations of example embodiments in whole or in part.

In general, terminology may be understood at least in part from usage in context. For example, terms, such as “and” , “or” , or “and/or, ” as used herein may include a variety of meanings that may depend at least in part on the context in which such terms are used. Typically, “or” if used to associate a list, such as A, B or C, is intended to mean A, B, and C, here used in the inclusive sense, as well as A, B or C, here used in the exclusive sense. In addition, the term “one or more” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense. Similarly, terms, such as “a, ” “an, ” or “the, ” may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context. In addition, the term “based on” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for existence of additional factors not necessarily expressly described, again, depending at least in part on context.

Reference throughout this specification to features, advantages, or similar language does not imply that all of the features and advantages that may be realized with the present solution should be or are included in any single implementation thereof. Rather, language referring to the features and advantages is understood to mean that a specific feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, discussions of the features and advantages, and similar language, throughout the specification may, but do not necessarily, refer to the same embodiment.

Furthermore, the described features, advantages and characteristics of the present solution may be combined in any suitable manner in one or more embodiments. One of ordinary skill in the relevant art will recognize, in light of the description herein, that the present solution can be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.

Claims

A method performed by a user equipment in a wireless communication network, comprising:

obtaining a resource scheduling message for an uplink transmission comprising an indication of a scheduled transmission resource and a transmission parameter;

determining, based on the transmission parameter, a channel detection mechanism; and

utilizing the determined channel detection mechanism to detect the scheduled transmission resource.
The method of claim 1, the method further comprises:

in response to a channel detection result meeting a channel access condition defined in the channel detection mechanism, occupying the scheduled transmission resource to transmit the uplink transmission.
The method of claim 1, wherein the channel detection mechanism comprises a type-1 channel detection or a type-2 channel detection.
The method of claim 3, wherein the type-2 channel detection comprises one of:

performing 25-μs-duration channel detection once;

performing 16-μs-duration channel detection once;

performing N-μs-duration channel detection once, wherein N is predefined or configured by a wireless network node; or

not performing channel detection.
The method of claim 3, wherein the type-1 channel detection is predetermined, indicated in a radio resource control signaling, or indicated in a downlink control information.
The method of claim 3, wherein the type-1 channel detection is a random backoff channel detection.
The method of claim 1, the resource scheduling message is an uplink grant.
The method of claim 1, wherein the transmission parameter comprises at least one of:

a downlink control information type,

a priority indicator,

a ChannelAccess-CPext-CAP,

a cancel indicator field indicating whether scheduling the uplink transmission involves cancellation of another uplink transmission, and

an uplink transmission resource indicator field indicating at least one of time domain resource scheduled for the uplink transmission and frequency domain resource scheduled for the uplink transmission.
The method of claim 8, wherein the transmission parameter comprises the cancel indicator field, and determining the channel detection mechanism based on the transmission parameter comprises:

in response to the cancel indicator field indicating scheduling the uplink transmission involves cancellation of another uplink transmission, determining a type-2 channel detection as the channel detection mechanism.
The method of claim 8, wherein the transmission parameter comprises the uplink transmission resource indicator field and determining the channel detection mechanism based on the transmission parameter comprises:

in response to the uplink transmission resource indicator field indicating the scheduled transmission resource falls within a channel occupancy time region, determining a type-2 channel detection as the channel detection mechanism, wherein the channel occupancy time region represents time-frequency resources that a wireless network node serving the user equipment occupies within a shared spectrum band or another user equipment occupies within a shared spectrum band.
The method of claim 1, wherein the transmission parameter comprises a power control indicator field indicating open-loop power control parameter for the uplink transmission.
The method of claim 11, wherein the determining the channel detection mechanism based on the transmission parameter comprises:

in response to the power control indicator field indicating to determine the open-loop power control parameter from open-loop power control parameter set configured via a radio resource control parameter P0-PUSCH-Set, determining a type-2 channel detection as the channel detection mechanism.
The method of claim 11, wherein the resource scheduling message is an uplink grant, and the power control indicator field is an open-loop power control parameter set indication field in the uplink grant.
The method of claim 11, further comprising:

obtaining a first power detection threshold and a second power detection threshold, the first power detection threshold being lower than the second power detection threshold; and

the utilizing the selected detection mechanism to detect the scheduled transmission resource comprises:

in response to the power control indicator field indicating to determine the open-loop power control parameter from open-loop power control parameter set configured via a radio resource control parameter P0-PUSCH-Set, utilizing the second power detection threshold to detect the scheduled transmission resource.
The method of claim 14, wherein the utilizing the selected detection mechanism to detect the scheduled transmission resource comprises:

in response to the power control indicator field indicating to determine the open-loop power control parameter from the open-loop power control parameter set configured via a radio resource control parameter P0-PUSCH-AlphaSet, utilizing the first power detection threshold to detect the scheduled transmission resource.
The method of claim 14, wherein the first power detection threshold or the second power detection threshold is configured within a radio resource control signaling or a downlink control information.
The method of claim 1, further comprising:

determining if the scheduled transmission resource has transmission from another system; and

wherein the determining the channel detection mechanism based on the transmission parameter comprises:

in response to the scheduled transmission resource having no transmission from the another system, determining the channel detection mechanism based on the transmission parameter.
The method of claim 17, further comprising:

in response to the scheduled transmission resource having transmission from the another system, determining a type-1 channel detection as the channel detection mechanism.
A device comprising a processor and a memory, wherein the processor is configured to read computer code from the memory to implement a method in any one of claims 1 to 18.
A computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method of any one of claims 1 to 18.