CN111818656A

CN111818656A - Scheduling Request (SR) sending method and device

Info

Publication number: CN111818656A
Application number: CN201910293513.9A
Authority: CN
Inventors: 刘建颖; 周欣
Original assignee: Potevio Information Technology Co Ltd
Current assignee: Potevio Information Technology Co Ltd
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2020-10-23

Abstract

The embodiment of the invention provides a Scheduling Request (SR) sending method and device. The method is applied to a Media Access Control (MAC) layer entity at a terminal side, and comprises the following steps: detecting that the MAC entity meets a preset pending SR sending condition, and receiving a channel interception (LBT) success indication sent by a physical layer at a terminal side; and executing an addition process on the SR counter, sending the channel access priority parameter of the pending SR to the physical layer, enabling the physical layer to determine an LBT parameter according to the channel access priority parameter, executing the LBT and enabling the physical layer to send the pending SR. The embodiment of the invention solves the problem of how to transmit the SR in the unauthorized frequency spectrum in the prior art.

Description

Scheduling Request (SR) sending method and device

Technical Field

The present invention relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for sending a scheduling request SR.

Background

Although the usage of licensed spectrum is efficient, the usage of licensed spectrum is expensive and the total amount of spectrum is limited in the mobile communication system, and unlicensed spectrum is increasingly paid attention by operators due to its rich available bandwidth and relatively low license cost, and becomes a supplementary spectrum resource for networks deployed based on licensed spectrum to enhance network services. In Long Term Evolution (LTE), an unlicensed spectrum has been used as a spectrum resource of an auxiliary cell of LTE equipment, that is, the unlicensed spectrum is used as an auxiliary carrier to perform carrier aggregation networking with an LTE Licensed spectrum carrier, which is called Licensed Assisted Access (LAA).

The 3GPP organization has confirmed that, on the basis of using the conventional licensed spectrum, a 5G Unlicensed spectrum (NR-U) is to be used in a 5G network, such as a band below 7GHz, a band below 7-52.6GHz, and/or a band above 52.6GHz, and so on; the NR-U is used by means of technologies such as Massive MIMO (Massive MIMO), high-frequency communication and beam forming in a 5G network, so that the shortage of authorized spectrum is made up, and the transmission efficiency and the coverage range are improved. The use of unlicensed spectrum in NR systems includes the following scenarios:

(1) performing carrier aggregation by using a licensed frequency band as a Primary serving Cell (PCell) and an unlicensed frequency band as a Secondary serving Cell (SCell);

(2) authorizing an LTE frequency band as a Pcell and an NR unlicensed frequency band as a primary and secondary serving cell (PScell) to carry out double connection;

(3) the authorized NR frequency band is used as a Pcell and the NR unauthorized frequency band is used as a PScell for carrying out double connection;

(4) an NR cell, a downlink unlicensed band, and an uplink licensed band;

(5) (standalone) NR-U alone.

In the NR-U unlicensed spectrum operation, since channels are shared, when a terminal (User Equipment, UE) side and a network side transmit a message using the channels, it is necessary to monitor whether the channels are available first, such a mechanism is called Channel sensing (LBT), the LBT detects a communication Channel by using Clear Channel Assessment (CCA), and only if the channels are detected to be idle, data can be transmitted, which is similar to the LBT mechanism in LTE LAA.

The LBT mechanism in LTE LAA is divided into two classes:

one is a single listen mechanism.

The wireless communication device executes a single time slot interception, and if the channel is detected to be idle, the wireless communication device can immediately access the channel; if the channel is detected to be busy, the channel is waited for to listen again in the next time slot until the channel can be accessed immediately after the channel is free.

Second is a multiple interception mechanism.

The wireless communication device randomly and uniformly generates a backoff counter N within the time from 0 to a Contention Window length (CWS) and monitors by taking a monitoring time slot (CCA slot) as a granularity; if the channel is detected to be free in the interception time slot, subtracting 1 from the back-off counter, otherwise, suspending the back-off counter until the channel is detected to be free, namely keeping the count of the back-off counter N unchanged in the busy time of the channel; the wireless communication device may immediately occupy the channel when the back-off counter N is decremented to 0.

For LTE LAA systems, Scheduling Requests (SRs) are sent in the licensed spectrum, while for the standby and dual connectivity scenarios of NR-U, the SR can be sent in the unlicensed spectrum. The SR must perform LBT operation before unlicensed spectrum transmission, and the SR transmission procedure is necessarily different from the prior art due to unlicensed spectrum resource sharing. Therefore, how to transmit the SR in the unlicensed spectrum is a problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a Scheduling Request (SR) sending method and device, which are used for solving the problem of how to send an SR in an unauthorized frequency spectrum in the prior art.

In one aspect, an embodiment of the present invention provides a scheduling request SR sending method, which is applied to a media access control layer MAC entity on a terminal side, where the method includes:

detecting that the MAC entity meets a preset pending SR sending condition, and receiving a channel interception (LBT) success indication sent by a physical layer at a terminal side;

and executing an addition process on the SR counter, sending the channel access priority parameter of the pending SR to the physical layer, enabling the physical layer to determine an LBT parameter according to the channel access priority parameter, executing the LBT and enabling the physical layer to send the pending SR.

On the other hand, an embodiment of the present invention provides a scheduling request SR sending method, which is applied to a physical layer at a terminal side, and the method includes:

In one aspect, an embodiment of the present invention provides a scheduling request SR transmitting apparatus, which is applied to a media access control layer MAC entity at a terminal side, where the apparatus includes:

an indication receiving module, configured to detect that the MAC entity meets a preset pending SR sending condition, and receive a channel sounding LBT success indication sent by a physical layer at a terminal side;

a parameter sending module, configured to add one to the SR counter, send the channel access priority parameter of the pending SR to the physical layer, enable the physical layer to determine an LBT parameter according to the channel access priority parameter, execute LBT, and enable the physical layer to send the pending SR.

On the other hand, an embodiment of the present invention provides a scheduling request SR transmitting apparatus, which is applied to a physical layer at a terminal side, and the apparatus includes:

an indication sending module, configured to detect that performing channel sensing (LBT) is successful, send an LBT success indication to a Media Access Control (MAC) entity at the terminal side, enable the MAC entity to perform an addition process on an SR counter according to the LBT success indication, and send a channel access priority parameter of a pending SR to the physical layer;

a parameter receiving module, configured to receive the channel access priority parameter, determine, according to the channel access priority parameter, that an LBT parameter performs LBT, and send the pending SR.

On the other hand, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, a bus, and a computer program that is stored in the memory and is executable on the processor, where the processor implements the steps in the scheduling request SR sending method when executing the program.

In still another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the scheduling request SR sending method described above.

According to the scheduling request SR sending method and device provided by the embodiment of the invention, the MAC entity is detected to meet the preset pending SR sending condition, the channel interception LBT success indication sent by the physical layer of the terminal side is received, the SR counter is added with one, the channel access priority parameter of the pending SR is sent to the physical layer, the physical layer determines the LBT parameter according to the channel access priority parameter, executes the LBT and sends the pending SR by the physical layer, and how to send the SR in the unlicensed spectrum is realized; after a final LBT success indication is received and the SR is successfully transmitted, the SR counter is added by one, so that the condition that the SR counter quickly reaches the maximum SR transmission frequency to trigger unnecessary random access and resource release processes is avoided, and the data transmission time delay is reduced; and the physical layer determines the LBT parameter based on the channel access priority parameter and executes the LBT to send the SR by sending the channel access priority parameter of the SR to the physical layer, thereby realizing the purpose of sending the SR according to the characteristics of the service and ensuring that the low-delay service can send the SR faster.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a flowchart illustrating a method for sending a scheduling request SR according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an exemplary scenario in accordance with an embodiment of the present invention;

fig. 3 is a second flowchart illustrating a method for sending a scheduling request SR according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a scheduling request SR transmitting apparatus according to an embodiment of the present invention;

fig. 5 is a second schematic structural diagram of a scheduling request SR transmitting apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a server according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

It should be appreciated that reference throughout this specification to "an embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrase "in an embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

Fig. 1 shows a flowchart of a scheduling request SR sending method according to an embodiment of the present invention.

As shown in fig. 1, a scheduling request SR sending method provided in an embodiment of the present invention is applied to a media access control layer MAC entity at a terminal side, and the method specifically includes the following steps:

step 101, detecting that the MAC entity meets a preset pending SR sending condition, and receiving a channel sounding LBT success indication sent by a physical layer at a terminal side.

The Medium Access Control (MAC) entity is a MAC entity at the terminal side. For the SRs, each SR is configured with logical channels, each logical channel being mapped to one SR configuration; when a certain logical channel of the UE has newly arrived uplink data to be transmitted, a Buffer Status Report (BSR) is triggered, and if there is no resource for transmitting the BSR at this time, an SR is triggered, where the SR is a pending SR.

In the NR-U system, due to unlicensed spectrum resource sharing, the UE needs to perform LBT operation before transmitting the SR; in the prior art, in the SR transmission process, the MAC layer adds 1 to the SR counter, and then notifies the physical layer to transmit the SR, regardless of whether the physical layer successfully transmits the SR, the SR counter continues to be increased on the original basis, which may cause the SR counter to reach the maximum SR transmission frequency quickly, trigger unnecessary random access and resource release processes, and thus increase data transmission delay. Therefore, in the embodiment of the present invention, when the MAC entity detects that there is at least one pending SR currently, for each pending SR, if the current MAC entity meets the preset pending SR transmission condition, a channel sensing LBT success indication sent by the physical layer at the terminal side is received, so as to ensure that the SR is successfully transmitted, and then the subsequent procedure is executed.

Step 102, adding one to the SR counter, sending the channel access priority parameter of the pending SR to the physical layer, enabling the physical layer to determine the LBT parameter according to the channel access priority parameter and execute LBT, and enabling the physical layer to send the pending SR.

After receiving the LBT success indication sent by the physical layer, the SR counter is incremented to avoid triggering unnecessary random access and resource release procedures. The MAC entity also sends a channel access priority parameter of the pending SR to the physical layer, wherein the channel access priority parameter is used for indicating the priority degree of the service type, so that the physical layer determines an LBT parameter according to the channel access priority parameter and ensures that the channel access priority used by the LBT operation is related to the service type; the LBT parameters are parameters used when performing LBT, such as window length, waiting time, etc., so that a high priority channel access can access a channel as soon as possible, and a low priority channel access can access the channel relatively slowly.

And after determining the LBT parameter, the physical layer executes the LBT according to the parameter and sends the pending SR, thereby realizing the purpose of sending the SR according to the characteristics of the service and being beneficial to ensuring that the low-delay service can send the SR faster.

As a specific example, referring to fig. 2, the physical layer first performs step (1), sends an LBT success indication to the MAC entity, the MAC entity performs step (2), adds one to the SR counter, and step (3), sends a channel access priority parameter to the physical layer; the physical layer executes the step (4) and the step (5) in sequence, and the step (4) determines LBT parameters and executes LBT; step (5) sends the pending SR.

In the above embodiment of the present invention, it is detected that the MAC entity satisfies the preset condition for sending the pending SR, and receives a successful indication of channel sounding LBT sent by a physical layer at a terminal, an SR counter is incremented, and a channel access priority parameter of the pending SR is sent to the physical layer, so that the physical layer determines the LBT parameter according to the channel access priority parameter and executes LBT and sends the pending SR to the physical layer, thereby implementing how to send the SR in an unlicensed spectrum; after a final LBT success indication is received and the SR is successfully transmitted, the SR counter is added by one, so that the condition that the SR counter quickly reaches the maximum SR transmission frequency to trigger unnecessary random access and resource release processes is avoided, and the data transmission time delay is reduced; and the physical layer determines the LBT parameter based on the channel access priority parameter and executes the LBT to send the SR by sending the channel access priority parameter of the SR to the physical layer, thereby realizing the purpose of sending the SR according to the characteristics of the service and ensuring that the low-delay service can send the SR faster. The embodiment of the invention solves the problem of how to transmit the SR in the unauthorized frequency spectrum in the prior art.

Optionally, in the foregoing embodiment of the present invention, the step of sending the channel access priority parameter of the pending SR to the physical layer includes:

determining a quality of service parameter, QCI, of a logical channel triggering the pending SR;

and determining the channel access priority parameter corresponding to the QCI according to a preset first corresponding relation.

The UE selects an SR configuration based on a Logical Channel (LCH), that is, transmission of the SR represents a certain type of service, and thus a Channel access type used for transmitting the SR may be determined based on the Logical Channel that triggers the SR. For example, if the SR is triggered by a non-emergency service, the channel access type of the corresponding triggered SR should be a low priority; if the SR is triggered by an emergency service, the channel access type triggering the SR should be high priority.

Specifically, when a Service of a certain logical channel triggers an SR, a Quality of Service parameter (QCI) of the logical channel that triggers the pending SR is first determined, and then a channel access priority parameter corresponding to the QCI is determined according to a mapping relationship between the QCI and a channel access priority, that is, a preset first correspondence relationship, so that the MAC layer needs to indicate the channel access priority to the physical layer, so that the physical layer determines the LBT parameter according to the channel access priority parameter.

Optionally, in the foregoing embodiment of the present invention, the step of causing the physical layer to send the pending SR includes:

selecting a bandwidth part BWP currently in an active state, and causing the physical layer to transmit the pending SR on a physical uplink control channel PUCCH of the selected BWP.

Wherein, the Bandwidth Part (BWP) of the active state may have one or more Bandwidth parts in the unlicensed spectrum; when there are multiple active BWPs, the MAC entity selects the BWP, sends the selected BWP to the Physical layer, and the Physical layer sends the pending SR on a Physical Uplink Control Channel (PUCCH) of the BWP.

Further, in this embodiment of the present invention, the step of selecting the bandwidth portion BWP currently in the active state includes:

if at least two BWPs are in an activated state currently, acquiring the occupancy parameters of the BWPs; wherein the occupancy parameter is determined according to a Received Signal Strength Indication (RSSI) and a channel occupancy rate (CO) of the BWP;

selecting the BWP with occupancy parameters meeting preset requirements.

For one MAC entity, there may be multiple SR configurations, each SR configuration containing PUCCH resources across different BWPs and cells; if there are multiple active BWPs simultaneously, the PUCCH resources on the multiple active BWPs are all considered valid at the SR transmission time for each SR configuration.

Aiming at the situation that a plurality of activated BWPs exist, the BWP is selected according to the BWP occupancy parameters of each BWP, the BWP occupancy parameters are determined according to the measurement results of Received Signal Strength Indicator (RSSI) and Channel Occupancy (CO), and then the BWP with the occupancy parameters meeting the preset requirements is selected.

In general, the smaller the two parameter values, the less occupied resource of this BWP is, so the preset requirement may be to select M BWPs with smaller measured RSSI and CO results by comparing RSSI and CO measurement results of multiple active BWPs, where the M value is determined by the UE.

Or the preset requirement may be to define a threshold value for each of the RSSI and CO parameters, such as RSSIth and COth, and select BWPs lower than the two threshold values according to the comparison between the measured value and the threshold value; if neither of the two results of the measurements is below the threshold value, all BWPs are selected.

Optionally, in this embodiment of the present invention, the step of detecting that the MAC entity satisfies a preset pending SR sending condition includes:

upon detection that there is a pending SR currently present,

if the MAC entity has no valid PUCCH configuration to the pending SR, initiating a random access flow in a special cell SpCell and canceling the pending SR;

if there is a valid PUCCH configuration for the MAC entity to the pending SR,

when detecting that there is a pending SR currently, if there is no valid PUCCH resource configurable for the pending SR in the MAC entity, initiating a random access procedure in a Special Cell (SpCell) and canceling the pending SR.

If the MAC entity has a valid PUCCH configured to the pending SR, respectively judging that the following conditions are met:

(1) the MAC entity has SR transmission time on the effective PUCCH;

(2) and an SR Prohibit Timer (SR-Prohibit Timer) is not running at the transmission time of the pending SR;

(3) the PUCCH resource at the transmission moment is not overlapped with the measurement distance at the terminal side;

(4) the PUCCH resource at the transmission time is not overlapped with an Uplink Shared Channel (UL-SCH) resource;

(5) and the SR COUNTER (SR-COUNTER) is less than the maximum transmission times (SR-TransMax);

and after the 5 conditions are simultaneously met, determining that the MAC entity meets the preset pending SR sending condition.

In the above embodiment of the present invention, it is detected that the MAC entity satisfies the preset condition for sending the pending SR, and receives a successful indication of channel sounding LBT sent by a physical layer at a terminal, an SR counter is incremented, and a channel access priority parameter of the pending SR is sent to the physical layer, so that the physical layer determines the LBT parameter according to the channel access priority parameter and executes LBT and sends the pending SR to the physical layer, thereby implementing how to send the SR in an unlicensed spectrum; after a final LBT success indication is received and the SR is successfully transmitted, the SR counter is added by one, so that the condition that the SR counter quickly reaches the maximum SR transmission frequency to trigger unnecessary random access and resource release processes is avoided, and the data transmission time delay is reduced; and the physical layer determines the LBT parameter based on the channel access priority parameter and executes the LBT to send the SR by sending the channel access priority parameter of the SR to the physical layer, thereby realizing the purpose of sending the SR according to the characteristics of the service and ensuring that the low-delay service can send the SR faster.

Referring to fig. 3, according to another aspect of the embodiment of the present invention, there is also provided a scheduling request SR transmitting method applied to a physical layer at a terminal side, where the method includes:

step 301, detecting that performing channel sensing LBT is successful, sending an LBT success indication to a MAC entity of a media access control layer at the terminal side, enabling the MAC entity to perform an addition process on an SR counter according to the LBT success indication, and sending a channel access priority parameter of a pending SR to the physical layer.

In the NR-U system, due to unlicensed spectrum resource sharing, the UE needs to perform LBT operation before transmitting the SR; in the prior art, in the SR transmission process, the MAC layer adds 1 to the SR counter, and then notifies the physical layer to transmit the SR, regardless of whether the physical layer successfully transmits the SR, the SR counter continues to be increased on the original basis, which may cause the SR counter to reach the maximum SR transmission frequency quickly, trigger unnecessary random access and resource release processes, and thus increase data transmission delay. Therefore, in the embodiment of the present invention, if the physical layer detects that performing channel sensing LBT is successful, an LBT success indication is sent to a MAC entity of a media access control layer at the terminal side, so that after the MAC entity receives the LBT success indication, it is ensured that SR is successfully sent, then an SR counter is executed with an addition process, and a channel access priority parameter of a pending SR is sent to the physical layer, where the channel access priority parameter is used to indicate a priority degree of a service type access channel.

Step 302, receiving the channel access priority parameter, determining an LBT parameter to perform LBT according to the channel access priority parameter, and sending the pending SR.

After receiving the channel access priority parameter, the physical layer determines an LBT parameter according to the priority parameter, and ensures that the channel access priority used by the LBT operation is related to the service type; the LBT parameters are parameters used when performing LBT, such as window length, waiting time, etc., so that a high priority channel access can access a channel as soon as possible, and a low priority channel access can access the channel relatively slowly.

In the above embodiment of the present invention, when detecting that the execution of the channel sensing LBT is successful, sending an LBT success indication to the MAC entity at the terminal side, so that the MAC entity performs an addition process on the SR counter according to the LBT success indication, and sends a channel access priority parameter of a pending SR to the physical layer; receiving the channel access priority parameter, determining the LBT parameter to execute LBT according to the channel access priority parameter, and sending the pending SR, so that how to send the SR in the unlicensed spectrum is realized; when the successful LBT of the execution channel is detected, the LBT success indication is sent to the MAC entity, so that after the SR is successfully sent, the MAC entity executes the SR counter to add one to avoid the condition that the SR counter quickly reaches the maximum SR sending frequency to trigger unnecessary random access and resource release processes, and the data sending time delay is reduced; and the LBT parameter is determined based on the channel access priority parameter, the LBT is executed, the SR is sent according to the characteristics of the service, and the low-delay service is ensured to send the SR more quickly. The embodiment of the invention solves the problem of how to transmit the SR in the unauthorized frequency spectrum in the prior art.

Optionally, in the foregoing embodiment of the present invention, the step of determining an LBT parameter according to the channel access priority parameter to perform LBT includes:

detecting that a remaining activation time of a deactivation timer of the bandwidth part BWP is less than or equal to an execution time of LBT, executing LBT;

performing LBT on the switched BWP if the terminal side switches the bandwidth part BWP in the course of performing the LBT.

If the UE detects that there is T1 time remaining in the deactivation Timer (BWP Inactivity Timer) of the BWP where the UE is currently located, the UE must perform the LBT procedure if the T1 time is greater than the LBT execution time; in the embodiment of the invention, even if the time T1 is less than or equal to the execution time of LBT and the SR is triggered, the UE needs to perform the LBT process; because the UE restarts the deactivation timer if it receives PDCCH or receives MAC PDU through configured grant within time T1, and the UE does not need to switch to new BWP, it can continue to work on the BWP to prevent the timer from being restarted upon receiving PDCCH, and continue to perform LBT procedure on the BWP, thereby reducing SR transmission delay. So the UE will do the LBT procedure as long as the SR is triggered.

If the UE does not receive the PDCCH or receives the MAC PDU through the configured authorization within the time T1, switching to the default BWP or the initially activated BWP after the time T1 expires; since the new BWP is switched, the frequency domain is changed, and the resource availability is changed, during the LBT procedure, the UE shall perform the LBT procedure again on the new BWP due to the expiration of the deactivation timer, that is, re-detect the channel contention condition, and if the LBT is successful, select a valid PUCCH resource on the new BWP to transmit the SR.

Optionally, in the above embodiment of the present invention, the step of determining the LBT parameter according to the channel access priority parameter includes:

and determining the LBT parameter corresponding to the channel access priority parameter according to a preset second corresponding relation.

Specifically, when a service of a certain logical channel triggers an SR, the MAC entity first determines a QCI that triggers the pending SR, and then determines a channel access priority parameter corresponding to the QCI according to a mapping relationship between the QCI and the channel access priority, that is, a preset first correspondence relationship, so that the MAC layer needs to indicate the channel access priority to the physical layer, so that the physical layer determines the LBT parameter according to the channel access priority parameter.

The physical layer determines an LBT parameter according to the channel access priority parameter and a preset second corresponding relation, and ensures that the channel access priority used by the LBT operation is related to the service type; the LBT parameters are parameters used when performing LBT, such as window length, waiting time, etc., so that a high priority channel access can access a channel as soon as possible, and a low priority channel access can access the channel relatively slowly.

Optionally, in the foregoing embodiment of the present invention, the step of sending the pending SR includes:

receiving the BWP selected by the MAC entity, and transmitting the pending SR on a Physical Uplink Control Channel (PUCCH) of the received BWP.

Wherein, the active state BWP may have one or more in the unlicensed spectrum; when there are multiple active BWPs, the MAC entity selects BWP, sends BWP to the physical layer, and the physical layer sends the pending SR on PUCCH of BWP.

The MAC layer (MAC entity) instructs the physical layer to send the SR at the selected BWP, the physical layer may select one BWP to send the SR, or may send multiple identical SRs at the same time at multiple BWPs, the physical layer needs to perform LBT operation before sending the SR, the parameter used by the LBT operation is obtained according to the instruction of the channel access priority, and when LBT succeeds, the physical layer sends the SR specifically as follows:

the step of transmitting the pending SR on a physical uplink control channel, PUCCH, of the received BWP comprises:

performing LBT on at least two received BWPs if there are the BWPs;

selecting a BWP with priority LBT success as a target BWP, and transmitting the pending SR on a PUCCH of the target BWP;

or

Transmitting the pending SR simultaneously on PUCCH on each of the BWPs.

The UE performs an LBT procedure on multiple BWPs simultaneously, sends an SR on a BWP that successfully performs LBT (detects that the channel is idle), and after a BWP successfully performs LBT, the UE shall cancel the LBT execution procedure on other BWPs.

In the above case of transmitting only one SR, for the case of simultaneously transmitting multiple SRs, in order to ensure reliability of data transmission and simultaneously ensure fast transmission of data, multiple parallel SR transmission processes are performed on multiple BWPs, so that the base station quickly receives the SRs. In addition, as long as the base station receives one SR, the SR transmission is considered to be successful; if the base station does not receive the SR, the UE needs to retransmit the SR on all BWPs after the SR-prohibit timer expires.

Considering that the UE needs to perform LBT operation on each BWP before sending information on the BWP, at this time, if there is a BWP that has completed LBT and started sending SR, due to power leakage between BWPs, interference may be caused to the BWP performing LBT; therefore, if the UE simultaneously transmits the SR on a plurality of BWPs, the UE can only complete LBT and start transmitting the SR on these BWPs simultaneously.

Since the back-off counter generated by each BWP when performing LBT operations is different in value and the experienced interference (contention for the channel occupied by the node causes the counter to hang) on each BWP is different, it is difficult to guarantee that the back-off counter of each BWP rolls back to zero at the same time. In order to make the back-off counters on multiple BWPs back to zero at the same time as much as possible, the following two transmission modes are proposed in the embodiment of the present invention: specifically, the step of simultaneously transmitting the pending SRs on the PUCCH on each BWP includes:

the first method is as follows:

detecting that a backoff counter of each BWP is cleared, performing single-slot interception for each BWP, and if an interception result indicates that a channel is idle, simultaneously sending the pending SR on a PUCCH of the BWP;

or the second mode:

selecting one primary BWP from the BWPs, performing random backoff based LBT only for the primary BWP;

when the back-off counter of each non-master BWP is cleared, performing single-slot interception aligned with the master BWP, and if the interception result indicates that the channel is idle, simultaneously transmitting the pending SR on the PUCCH of the BWP.

In the first method, the UE decides to start transmitting the SR simultaneously on multiple BWPs (e.g. all BWPs complete counter countdown), may listen to an additional single-slot listening on multiple BWPs simultaneously and aligned, and for each BWP that completes counter countdown, if the listening result of the additional single-slot listening indicates that the channel is idle, the UE may transmit the SR on the BWP; if busy, the UE cannot send an SR on this BWP.

In the second mode, the UE selects one primary BWP, and then the other BWPs are configured as secondary BWPs, and when performing LBT, perform LBT based on random backoff only for the primary BWP, and when the backoff counter of the primary BWP is about to fall back to zero, the other secondary BWPs perform single timeslot interception by a single interception mechanism aligned with the primary BWP, and the secondary BWP that has successfully single timeslot interception can send SR.

In addition, three parameters of SR-inhibit Timer, SR-Trans Max and SR-COUNTER in the NR system are configured for each SR; when multiple SRs are transmitted on multiple BWPs, these three parameters are configured not only for the SRs, but also individually for each BWP, i.e. the SR transmission on each BWP is independent from each other.

In the above embodiment of the present invention, the channel access priority used in LBT operation is related to the service type, so that SR can be sent according to the characteristics of the service, which is beneficial to ensuring that low-latency service sends SR faster. If the UE triggers the SR in the timeout period of the BWP activity Timer, the UE still needs to execute the LBT process even if the remaining time is not enough for the UE to do the LBT process, the PDCCH restart Timer is prevented from being received, the LBT process can be continuously done on the BWP, and the SR sending time delay is reduced; if the switch is made to the new BWP, the LBT procedure is redone, which is more effective in detecting the availability of the new BWP resource.

After the physical layer gives an LBT success indication to the MAC layer, the SR counter is added with 1, so that the problems that the BWP channel is not occupied well before switching and unnecessary random access process and resource release process are triggered when the BWP channel is occupied well after switching are avoided.

In addition, for the unlicensed spectrum usage in the NR system, the embodiment of the present invention provides a SR transmission scheme based on the condition that multiple BWPs are simultaneously activated, where the SR is transmitted on the BWP where LBT is successfully performed first, or the SRs is transmitted on multiple BWPs simultaneously, which is beneficial to reducing the SR transmission delay, and also reduces the uplink data transmission delay, so that the SR can be transmitted more efficiently.

Having described the method for sending the scheduling request SR according to the embodiment of the present invention, a scheduling request SR sending apparatus according to the embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 4, a scheduling request SR transmitting apparatus provided in an embodiment of the present invention is applied to a MAC entity of a media access control layer at a terminal side, and the apparatus includes:

an indication receiving module 401, configured to detect that the MAC entity meets a preset pending SR sending condition, and receive a channel sounding LBT success indication sent by a physical layer at a terminal side.

Wherein, the MAC entity is a MAC entity at the terminal side. For the SRs, each SR is configured with logical channels, each logical channel being mapped to one SR configuration; when a certain logical channel of the UE has newly arrived uplink data to be sent, triggering the BSR, and if no resource for sending the BSR exists, triggering the SR, wherein the SR is a pending SR.

In the NR-U system, due to unlicensed spectrum resource sharing, the UE needs to perform LBT operation before transmitting the SR; in the prior art, in the SR transmission process, the MAC layer adds 1 to the SR counter, and then notifies the physical layer to transmit the SR, regardless of whether the physical layer successfully transmits the SR, the SR counter continues to be increased on the original basis, which may cause the SR counter to reach the maximum SR transmission frequency quickly, trigger unnecessary random access and resource release processes, and thus increase data transmission delay. Therefore, in the embodiment of the present invention, when the MAC entity detects that there is at least one pending SR currently, for each pending SR, if the current MAC entity meets the preset pending SR transmission condition, a channel sensing LBT success indication sent by the physical layer at the terminal side is received, so as to ensure that the SR is successfully transmitted, and then the subsequent procedure is executed. A parameter sending module 402, configured to add one to the SR counter, send the channel access priority parameter of the pending SR to the physical layer, enable the physical layer to determine an LBT parameter according to the channel access priority parameter, perform LBT, and enable the physical layer to send the pending SR.

A parameter sending module 402, configured to add one to the SR counter, send the channel access priority parameter of the pending SR to the physical layer, enable the physical layer to determine an LBT parameter according to the channel access priority parameter, perform LBT, and enable the physical layer to send the pending SR.

Optionally, in the foregoing embodiment of the present invention, the parameter sending module 402 is configured to:

Optionally, in the foregoing embodiment of the present invention, the parameter sending module 402 includes:

a BWP selection sub-module, configured to select a bandwidth portion BWP currently in an active state, and enable the physical layer to transmit the pending SR on a physical uplink control channel PUCCH of the selected BWP.

Optionally, in the foregoing embodiment of the present invention, the BWP selection sub-module is configured to:

selecting the BWP with occupancy parameters meeting preset requirements.

Optionally, in the foregoing embodiment of the present invention, the indication receiving module 401 includes:

a detection submodule for detecting that there is currently a pending SR,

a cancellation submodule, configured to initiate a random access procedure in a special cell SpCell and cancel the pending SR if the MAC entity does not have a valid PUCCH configured to the pending SR;

a determining submodule, configured to determine that the MAC entity satisfies a predetermined pending SR transmission condition if there is a valid PUCCH configured for the pending SR in the MAC entity, an SR transmission time exists on the valid PUCCH in the MAC entity, an SR prohibit timer is not running at the transmission time of the pending SR, a PUCCH resource at the transmission time does not overlap with a measurement gap at the terminal side, the PUCCH resource at the transmission time does not overlap with an UL-SCH resource at an uplink shared channel, and an SR counter is smaller than a maximum transmission number.

In the above embodiment of the present invention, the instruction receiving module 401 detects that the MAC entity meets the preset pending SR sending condition, and receives the channel listen LBT success instruction sent by the physical layer at the terminal side, and performs an addition process on the SR counter, and the parameter sending module 402 sends the channel access priority parameter of the pending SR to the physical layer, so that the physical layer determines the LBT parameter according to the channel access priority parameter and executes LBT and sends the pending SR to the physical layer, thereby implementing how to send the SR in the unlicensed spectrum; after a final LBT success indication is received and the SR is successfully transmitted, the SR counter is added by one, so that the condition that the SR counter quickly reaches the maximum SR transmission frequency to trigger unnecessary random access and resource release processes is avoided, and the data transmission time delay is reduced; and the physical layer determines the LBT parameter based on the channel access priority parameter and executes the LBT to send the SR by sending the channel access priority parameter of the SR to the physical layer, thereby realizing the purpose of sending the SR according to the characteristics of the service and ensuring that the low-delay service can send the SR faster.

As shown in fig. 5, a scheduling request SR transmitting apparatus provided in an embodiment of the present invention is applied to a physical layer at a terminal side, and the apparatus includes:

an indication sending module 501, configured to detect that performing channel sensing LBT is successful, send an LBT success indication to a MAC entity of a media access control layer at the terminal side, enable the MAC entity to perform an addition process on an SR counter according to the LBT success indication, and send a channel access priority parameter of a pending SR to the physical layer.

In the NR-U system, due to unlicensed spectrum resource sharing, the UE needs to perform LBT operation before transmitting the SR; in the prior art, in the SR transmission process, the MAC layer adds 1 to the SR counter, and then notifies the physical layer to transmit the SR, regardless of whether the physical layer successfully transmits the SR, the SR counter continues to be increased on the original basis, which may cause the SR counter to reach the maximum SR transmission frequency quickly, trigger unnecessary random access and resource release processes, and thus increase data transmission delay. Therefore, in the embodiment of the present invention, if the physical layer detects that performing channel sensing LBT is successful, an LBT success indication is sent to a MAC entity of a media access control layer at the terminal side, so that after the MAC entity receives the LBT success indication, it is ensured that SR is successfully sent, then an SR counter is executed with an addition process, and a channel access priority parameter of a pending SR is sent to the physical layer, where the channel access priority parameter is used to indicate a priority degree of a service type.

A parameter receiving module 502, configured to receive the channel access priority parameter, determine, according to the channel access priority parameter, that an LBT parameter performs LBT, and send the pending SR.

Optionally, in the foregoing embodiment of the present invention, the parameter receiving module 502 includes:

an execution sub-module for executing the LBT upon detecting that a remaining activation time of a deactivation timer of the bandwidth part BWP is less than or equal to an execution time of the LBT;

Optionally, in the foregoing embodiment of the present invention, the parameter receiving module 502 is configured to:

a transmitting sub-module, configured to receive the BWP selected by the MAC entity, and transmit the pending SR on a physical uplink control channel, PUCCH, of the received BWP.

Optionally, in the foregoing embodiment of the present invention, the sending sub-module is configured to:

performing LBT on at least two received BWPs if there are the BWPs;

or

Transmitting the pending SR simultaneously on PUCCH on each of the BWPs.

Optionally, in the foregoing embodiment of the present invention, the sending the pending SRs on the PUCCH on each BWP simultaneously includes:

or

In the above embodiment of the present invention, when detecting that performing channel sensing LBT is successful, the instruction sending module 501 sends an LBT success instruction to the MAC entity at the terminal side, so that the MAC entity performs an add process on the SR counter according to the LBT success instruction, and sends a channel access priority parameter of a pending SR to the physical layer; the parameter receiving module 502 receives the channel access priority parameter, determines the LBT parameter to execute LBT according to the channel access priority parameter, and sends the pending SR, so that how to send the SR in the unlicensed spectrum is realized; when the successful LBT of the execution channel is detected, the LBT success indication is sent to the MAC entity, so that after the SR is successfully sent, the MAC entity executes the SR counter to add one to avoid the condition that the SR counter quickly reaches the maximum SR sending frequency to trigger unnecessary random access and resource release processes, and the data sending time delay is reduced; and the LBT parameter is determined based on the channel access priority parameter, the LBT is executed, the SR is sent according to the characteristics of the service, and the low-delay service is ensured to send the SR more quickly.

For example, as follows, when the electronic device is a server, fig. 6 illustrates a physical structure diagram of the server.

As shown in fig. 6, the server may include: a processor (processor)610, a communication Interface (Communications Interface)620, a memory (memory)630 and a communication bus 640, wherein the processor 610, the communication Interface 620 and the memory 630 communicate with each other via the communication bus 640. The processor 610 may call logic instructions in the memory 630 to perform the following method:

Or

Detecting that the LBT is successfully executed, sending an LBT success indication to a media access control layer (MAC) entity of the terminal side, enabling the MAC entity to execute an addition process on an SR counter according to the LBT success indication, and sending a channel access priority parameter of a pending SR to the physical layer;

and receiving the channel access priority parameter, determining an LBT parameter to execute LBT according to the channel access priority parameter, and sending the pending SR.

In addition, the logic instructions in the memory 630 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A Scheduling Request (SR) sending method is applied to a Media Access Control (MAC) layer entity at a terminal side, and is characterized by comprising the following steps:

2. The SR transmitting method of claim 1, wherein the step of transmitting the channel access priority parameter of the pending SR to the physical layer comprises:

3. The method of claim 1, wherein the step of causing the physical layer to transmit the pending SR comprises:

4. The SR transmission method of claim 3, wherein the step of selecting the bandwidth portion BWP currently in the active state comprises:

selecting the BWP with occupancy parameters meeting preset requirements.

5. The SR transmitting method of claim 1, wherein the step of detecting that the MAC entity satisfies a predetermined condition for pending SR transmission comprises:

upon detection that there is a pending SR currently present,

and if the MAC entity has a valid PUCCH configuration to the pending SR, the MAC entity has SR transmission time on the valid PUCCH, an SR prohibiting timer does not run at the transmission time of the pending SR, PUCCH resources at the transmission time are not overlapped with the measurement interval at the terminal side, the PUCCH resources at the transmission time are not overlapped with uplink shared channel (UL-SCH) resources, and an SR counter is less than the maximum transmission times, determining that the MAC entity meets the preset pending SR transmission condition.

6. A Scheduling Request (SR) sending method is applied to a physical layer at a terminal side, and is characterized by comprising the following steps:

7. The SR transmitting method of claim 6, wherein the step of determining LBT parameters to perform LBT according to the channel access priority parameters comprises:

8. The SR transmitting method of claim 6, wherein the step of determining the LBT parameter according to the channel access priority parameter comprises:

9. The method according to claim 6, wherein the step of transmitting the pending SR comprises:

10. The method of claim 9, wherein the step of transmitting the pending SR on a physical uplink control channel, PUCCH, of the received BWP comprises:

performing LBT on at least two received BWPs if there are the BWPs;

or

Transmitting the pending SR simultaneously on PUCCH on each of the BWPs.

11. The method of claim 10, wherein the step of simultaneously transmitting the pending SR on the PUCCH on each BWP comprises:

or

12. A scheduling request SR transmitting apparatus, applied to a media access control layer MAC entity at a terminal side, the apparatus comprising:

13. A scheduling request SR transmission apparatus applied to a physical layer at a terminal side, the apparatus comprising:

14. An electronic device comprising a memory, a processor, a bus and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps in the scheduling request, SR, transmission method according to any of claims 1 to 11 when executing the program.

15. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that: the program when executed by a processor realizes the steps in the scheduling request, SR, transmission method according to any of claims 1 to 11.