User equipment and LP-WUR energy saving enhancement method

Abstract

The invention discloses a plurality of methods, and relates to the enhancement of the energy conservation performance of a low power wake up receiver (LP-WUR), and particularly relates to the enhancement of the energy conservation performance of the low power wake up receiver (LP-WUR). According to the first method, the energy-saving effect of a low power wakeup signal (LP-WUR) is improved through an LP-WUR monitoring process used for detecting the LP-WUS, and the method comprises the steps that when user equipment (UE) is awakened by network triggering, the continuous monitoring behavior of the LP-WUR on LP-WUS detection is started for a period of time; and before the UE is awakened by the network trigger again, the continuous monitoring behavior of the LP-WUR on the LP-WUS is forbidden. According to the second method, the energy saving performance of the LP-WUR is improved by configuring the bandwidth of the LP-WUS, and the configuration comprises the steps that a physical resource block (PRB) of the LP-WUS is configured on the lower edge or the upper edge of a carrier bandwidth, or a dedicated bandwidth part (BWP) is configured for the UE, so that the transmission of the LP-WUS and a low power synchronization signal (LP-SS) is realized. According to the third method, the energy saving performance of the LP-WUR is improved through a radio resource management (RRM) relaxation mechanism based on the LP-WUR.

Description

Technical Field

[0001] The present application relates to the field of wireless communication systems, and more particularly to a method for monitoring a user equipment (UE) and a low power wake up receiver (LP-WUR) for detecting a low power wake up signal (LP-WUS) in a 5G new radio (NR) communication system. More specifically, the present application discusses a variety of methods for reducing the power consumption of LP-WUR. Background Art

[0002] Energy efficiency is one of the fundamental requirements for 5G systems, as they need to support a wide range of different use cases, including power-sensitive devices such as IoT devices (industrial wireless sensors, controllers), wearables, etc. The power consumption of these devices depends on the length of their configured wake-up cycles, such as paging cycles. To meet battery life requirements, longer eDRX cycles are often used, but this results in higher latency, which is not suitable for services that require both long battery life and low latency. For example, in the fire detection and fire extinguishing use case, once the sensor detects a fire, the actuator must close the fire shutter and open the sprinkler within 1 to 2 seconds, so a long eDRX cycle cannot meet this latency requirement. Obviously, eDRX is not suitable for latency-sensitive application scenarios. In DRX and eDRX cycles, the UE needs to wake up regularly once every cycle, and its power consumption is mainly determined by these periodic wake-up behaviors, even during periods when there is no signaling or data transmission. If the UE wakes up only when triggered, such as through paging in idle / inactive state and through PDCCH in connected state, the power consumption can be significantly reduced. This can be achieved by triggering the main radio (MR) with a wake-up signal and a separate receiver that can listen for the wake-up signal with ultra-low power consumption, as shown in the study item description (SID) below: Targeting low power WUS / WUR for power-sensitive, small devices, including IoT applications (e.g., industrial sensors, controllers) and wearables. Study and evaluate the design of wake-up signals to support wake-up receivers [RAN1, RAN4]. Study the improvement of UE power saving potential, coverage and latency impact compared to existing Release-15 / 16 / 17 UE power saving mechanisms. System-level impacts such as network power consumption, coexistence with non-low power WUR UEs, network coverage / capacity / resource overhead should also be included in the scope of study [RAN1]. In addition, the low power wake up signal (LP-WUS) also focuses on low latency requirements, such as lower latency than eDRX, to support multiple use cases.

[0003] In the prior art, several companies have proposed suggestions for LP-WUR monitoring behaviors for LP-WUS detection. However, there is no clear solution specifically for monitoring behaviors that improve the power saving effect of LP-WUR. In addition, there is no clear bandwidth configuration solution for LP-WUS in the prior art, or a solution that can enhance the power saving effect by relaxing the RRM measurement requirements related to LP-WUR. Therefore, it is necessary to further study the LP-WUR monitoring behavior for detecting / decoding LP-WUS to avoid unnecessary decoding of each LP-WUS, thereby reducing the power consumption of LP-WUR. Summary of the invention

[0004] The purpose of the present application is to propose a user equipment (UE) and a method for monitoring a low power wake up receiver (LP-WUR) for detecting a low power wake up signal (LP-WUS) to study the monitoring behavior of the LP-WUR when detecting / decoding the LP-WUS, thereby avoiding unnecessary decoding of each LP-WUS and reducing the power consumption of the LP-WUR.

[0005] In the first aspect of the present application, a method for an LP-WUR monitoring process for detecting an LP-WUS is provided, comprising: the UE enables and disables the monitoring behavior of the LP-WUR according to the load information of a low power synchronization signal (LP-SS) and / or the on / off state of the main radio (MR) of the UE. For example, when the UE is triggered to wake up by the network, the continuous monitoring behavior of the LP-WUR for LP-WUS detection is enabled for a period of time; from the first time it is triggered until the UE is triggered to wake up by the network again, the continuous monitoring behavior of the LP-WUR is disabled.

[0006] In a second aspect of the present application, a UE is provided, which is configured to: enable the continuous monitoring behavior of LP-WUR for LP-WUS detection when the UE is triggered to wake up by the network, and disable the continuous monitoring behavior from the first trigger until the UE is triggered to wake up by the network again.

[0007] In a third aspect of the present application, a UE is provided, which is configured to receive a frequency position of a LP-WUS at a lower edge physical resource block (PRB) or an upper edge PRB of a carrier bandwidth.

[0008] According to a fourth aspect of the present application, a UE is provided, which is configured with a downlink bandwidth part (BWP) dedicated to LP-WUS and / or LP-SS, and the maximum bandwidth is not greater than the bandwidth required by LP-WUS.

[0009] In the fifth aspect of the present application, when the UE enters the LP-WUS mode, certain radio resource management (RRM) measurements are performed by the LP-WUR of the UE, wherein the LP-WUR-based RRM measurements include only RRM measurements, RRM relaxation based on UE groups and / or RRM measurements based on LP-WUS.

[0010] In a third aspect of the present application, a user equipment is provided, which includes a memory, a transceiver, and a processor coupled to the memory and the transceiver, wherein the processor is configured to execute the above method.

[0011] In a fourth aspect of the present application, a non-temporary machine-readable storage medium is provided, in which instructions are stored, and when the instructions are executed by a computer, the computer executes the above method.

[0012] In a fifth aspect of the present application, a chip is provided, the chip comprising a processor, the processor being configured to call and run a computer program stored in a memory so that a device on which the chip is installed executes the above method.

[0013] In a sixth aspect of the present application, a computer-readable storage medium is provided, in which a computer program is stored, and the program can enable a computer to execute the above method.

[0014] In a seventh aspect of the present application, a computer program product is provided, which includes a computer program, and the program can enable a computer to execute the above method.

[0015] In an eighth aspect of the present application, a computer program is provided, which can enable a computer to execute the above method. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or related technologies, the following briefly introduces the drawings to be described in the embodiments. Obviously, the drawings are only some embodiments of the present application, and ordinary technicians in this field can obtain other drawings based on these drawings without paying any price.

[0017] Figure 1A A schematic diagram showing an example of LP-WUR in IEEE.

[0018] Figure 1B A schematic diagram showing another example of LP-WUR in IEEE.

[0019] Figure 2 A schematic diagram showing an example of non-essential decoding of LP-WUS.

[0020] Figure 3A schematic diagram showing an example of unnecessary power consumption of the LP-WUR due to continuous monitoring of the LP-WUS.

[0021] Figure 4 A block diagram showing communication between one or more user equipments and a network / gNB in ​​a communication network system according to an embodiment of the present application is shown.

[0022] Figure 5 A flow chart of a method for a LP-WUR monitoring process for detecting LP-WUS according to an embodiment of the present application is shown.

[0023] Figure 6 A schematic diagram shows an example of enabling / disabling LP-WUR / LP-WUS monitoring through load information in LP-SS according to an embodiment of the present application.

[0024] Figure 7 A schematic diagram shows an example of an LP-WUR avoiding unnecessary detection of an LP-WUS according to an embodiment of the present application.

[0025] Figure 8 A schematic diagram showing an example of enabling / disabling LP-WUR monitoring based on MR on / off status according to an embodiment of the present application.

[0026] Fig. 9 A schematic diagram shows an example of a UE implicitly indicating LP-WUS reception according to an embodiment of the present application.

[0027] Fig.10 A schematic diagram shows an example of a UE explicitly indicating LP-WUS reception according to an embodiment of the present application.

[0028] Fig.11 A schematic diagram showing an example of a timer-based LP-WUS reliability solution according to an embodiment of the present application is shown.

[0029] Fig.12 A schematic diagram shows an example of LP-WUR retuning radio frequency for LP-SS and LP-WUS according to an embodiment of the present application.

[0030] Fig.13 A schematic diagram showing an example of LP-WUR searching in the entire BWP to detect LP-WUS according to an embodiment of the present application.

[0031] Fig.14 A schematic diagram showing an example of bandwidth configuration for LP-WUS according to an embodiment of the present application is shown.

[0032] Fig.15 A block diagram of a UE for wireless communication according to an embodiment of the present application is shown.

[0033] Fig.16 A block diagram of a system for wireless communication according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0034] The technical content, structural features, objectives and effects of the present application are described in detail below in conjunction with the accompanying drawings. Specifically, the terms in the embodiments of the present application are only used to describe the purpose of specific embodiments, and are not intended to limit the present application.

[0035] The basic process and working principle of LP-WUS and LP-WUR are as follows Figure 1A and Figure 1B As shown in the figure, MR is only used for data transmission and reception. It can be turned off or set to deep sleep state when not in use, while LP-WUR remains on to monitor wake-up signals. The schematic diagram of LP-WUS and LP-WUR is based on the IEEE low-power receiver architecture and can be used as the basis for designing LP-WUS processes and LP-WUR architectures for 3GPP cellular networks.

[0036] The core requirement of Rel-18 for low-power WUS / WUR is to allow the UE's MR to remain in sleep mode for a long time and wake up the MR only when the UE needs to receive or send data / signaling, thereby improving the UE's energy-saving efficiency without sacrificing latency performance. However, the power consumption of LP-WUR is significantly affected by factors such as its behavior of monitoring LP-WUS, the bandwidth configuration of LP-WUS, and the RRM measurements performed by LP-WUR. For example, if the UE's LP-WUR continuously monitors the LP-WUS signal, its power consumption will be significantly higher than the duty cycle-based monitoring mode, in which the LP-WUR only monitors the LP-WUS during a specific time period. In addition, the transmission method of LP-WUS (such as periodic transmission or specific event triggering) will also affect the power consumption of LP-WUR. The following summarizes the key issues that lead to increased power consumption of LP-WUR.

[0037] 1. When LP-WUR continuously monitors LP-WUS, UE's LP-WUR may unnecessarily decode all periodic or configuration-triggered LP-WUS, even if these LP-WUS do not contain information that triggers MR wake-up, which will still cause LP-WUR power consumption to increase, such as Figure 2 Similarly, if the network does not transmit LP-WUS, LP-WUR continues to monitor, which will also cause unnecessary power consumption waste, such as Figure 3 shown.

[0038] 2. When LP-SS and LP-WUS are not configured in the same BWP, the bandwidth of LP-WUS may also affect the power consumption of LP-WUR, and LP-WUR needs to frequently re-tune the RF to receive LP-SS and synchronize with the network. In addition, as described in detail in the embodiments below, when LP-WUR searches for LP-WUS in the entire existing activated downlink BWP, more power consumption will also be consumed.

[0039] 3. The RRM measurements performed by the LP-WUR may also affect its power consumption, which will be described in detail in subsequent embodiments.

[0040] Therefore, it is necessary to further study the monitoring behavior of LP-WUR during the detection / decoding of LP-WUS to avoid unnecessary decoding of each LP-WUS, thereby reducing the power consumption of LP-WUR. Several embodiments of the present application further study the monitoring behavior of LP-WUR in LP-WUS detection, the bandwidth and BWP configuration of LP-WUS, and the RRM relaxation mechanism performed by LP-WUR in LP-WUS mode to enhance the energy-saving performance of LP-WUR.

[0041] The main purpose of this invention is to define and develop an ultra-low power consumption mechanism and study various methods to improve the energy saving effect of LP-WUR.

[0042] To achieve the above goals, the proposed solutions are summarized as follows:

[0043] 1. A solution to enable / disable LP-WUR monitoring behavior to detect LP-WUS is proposed to improve the energy saving effect of LP-WUR, including:

[0044] The LP-WUR monitoring behavior is enabled or disabled based on the load information carried by the LP-SS.

[0045] The LP-WUR monitoring behavior is enabled and disabled based on the on / off state of the main radio (MR).

[0046] 2. A variety of LP-WUR power consumption reduction schemes based on the required bandwidth of LP-WUS and the low-complexity architecture of LP-WUR are proposed, as follows:

[0047] A scheme for configuring LP-WUS bandwidth for UE is proposed to reduce the power consumption of LP-WUR when performing LP-WUS detection.

[0048] A scheme of configuring dedicated BWP for LP-WUS and LP-SS is proposed to avoid RF retuning of LP-WUR and reduce the power consumption of LP-WUR when decoding LP-WUS.

[0049] 3. A variety of relaxation schemes for RRM measurements of LP-WUR are proposed based on the existing RRM relaxation to reduce the power consumption of LP-WUR when performing RRM measurements and support the mobility of UE.

[0050] This application discusses a variety of methods for reducing the power consumption of LP-WUR, and has the following advantages: 1. Improving the energy-saving performance of LP-WUR; 2.

[0051] 1. Avoid unnecessary LP-WUS decoding and reduce the complexity of LP-WUR; 2. Avoid RF re-tuning of LP-WUR to synchronize with the network; 3. Support UE mobility in LP-WUS mode.

[0052] Figure 4 It is illustrated that in some embodiments, according to an embodiment of the present application, communication between one or more user equipments (UE) 10 and a network / gNB 20 in a communication network system 40 is provided. The communication network system 40 includes one or more UEs 10 and a network / gNB 20. The one or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The network / gNB 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23.

[0053] The processor 11 or 21 may be configured to execute the functions, processes and / or methods described in this application. Each layer of the wireless interface protocol may be implemented on the processor 11 or 21. The memory 12 or 22 is operatively coupled to the processor 11 or 21 and stores various information to support the operation of the processor 11 or 21. The transceiver 13 or 23 is operatively coupled to the processor 11 or 21 and is used to send and / or receive wireless signals.

[0054] The processor 11 or 21 may include an application-specific integrated circuit (ASIC); other chipsets; logic circuits; data processing devices. The memory 12 or 22 may include a read-only memory (ROM); a random access memory (RAM); flash memory; a memory card; a storage medium and / or other storage devices. The transceiver 13 or 23 may include a baseband circuit for processing radio frequency signals. When the embodiment is implemented in software form, the technology may be implemented by modules (such as processes, functions, etc.) that perform corresponding functions. These modules may be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 may be integrated inside the processor 11 or 21; an external memory, which is communicatively connected to the processor 11 or 21 in various known ways.

[0055] Figure 5 A method 500 of an LP-WUR monitoring process for LP-WUS detection is illustrated, according to an embodiment of the present application. The method 500 includes: the UE enables or disables the monitoring behavior of the LP-WUR based on the load information of the LP-SS and / or the on / off status of the MR. In some embodiments, the method 500 includes: step 502, when the UE is triggered to wake up by the network, enabling the continuous monitoring behavior of the LP-WUR for LP-WUS detection, and disabling the continuous monitoring behavior during the time period from the first trigger to the UE being triggered to wake up by the network again. In addition, the processor 11 is configured to execute the above method 500, and may further execute the methods in the following embodiments, so as to improve the energy saving effect of the monitoring behavior of the LP-WUR.

[0056] In some embodiments, enabling and disabling the continuous monitoring behavior of LP-WUR for LP-WUS detection is implemented through a bitmap in the payload of LP-SS. In some embodiments, each bit in the bitmap is allocated to the UE or UE group in ascending order of the UE entering the LP-WUS mode according to the UE identifier (identifier, ID) or the group ID of the UE group. In some embodiments, the payload length is defined as X bits, X represents the total number of bits to enable / disable the function, and its range is {2, 4, 8} bits. In some embodiments, when the amount of information carried in the payload is less than the total bit length, the remaining unused bits are regarded as reserved bits. In some embodiments, when the bit value in the bitmap is the first value, the continuous monitoring behavior of LP-WUR for LP-WUS detection is enabled; when the bit value is the second value, the continuous monitoring behavior is disabled. In some embodiments, enabling and disabling the continuous monitoring behavior of LP-WUR for LP-WUS detection is based on UE or UE group. In some embodiments, LP-SS is a periodically transmitted LP-SS.

[0057] In some embodiments, when the UE's MR is in the on state, the UE's LP-WUR's continuous monitoring behavior for LP-WUS detection is considered inactive until the UE's MR is turned on again. In some embodiments, when the UE's MR is in the off state, the UE's LP-WUR's continuous monitoring behavior for LP-WUS detection is considered activated. In some embodiments, enabling and disabling the LP-WUR's continuous monitoring behavior for LP-WUS detection includes the UE's MR sending an indication to the network that the LP-WUR has successfully received and decoded the LP-WUS. In some embodiments, the indication is derived by the network by receiving the first ACK message from the UE's MR after receiving data / signaling. In some embodiments, when the LP-WUS triggers the MR to wake up, the MR sends an ACK message to the network to notify the network that the LP-WUS has been successfully received. In some embodiments, when the UE fails to detect / decode the LP-WUS and the network does not receive any ACK message from the UE's MR before the timer expires, the LP-WUS will be resent for the UE or UE group. In some embodiments, the duty cycle of the continuous monitoring behavior of the LP-WUR for LP-WUS detection can be derived from the DRX configuration and / or the eDRX configuration. In addition, the above embodiments can be used to improve the energy saving effect of the LP-WUR, avoid unnecessary LP-WUS decoding, reduce the complexity of the LP-WUR, avoid RF re-tuning of the LP-WUR for synchronization with the network, and / or support the mobility of the UE in the LP-WUS mode.

[0058] In some embodiments, a method for UE-oriented LP-WUS bandwidth configuration includes bandwidth configuration for LP-WUS, and has a defined frequency position. In some embodiments, the configuration of the LP-WUS bandwidth is in units of physical resource blocks (PRBs), and is configured at the lower edge PRBs or upper edge PRBs of the cell carrier bandwidth. In some embodiments, the bandwidth configuration of the LP-WUS can be completed through radio resource control (RRC) configuration during initial access, or through system information block x (SIBx). In some embodiments, the LP-WUS bandwidth configuration method also includes receiving, by the UE, a downlink BWP dedicated to LP-WUS and LP-SS, whose maximum bandwidth is not greater than the bandwidth required by the LP-WUS. In some embodiments, the dedicated downlink BWP is configured according to the UE bandwidth requirement required by the LP-WUR. In some embodiments, the dedicated downlink BWP is configured through DownlinkConfigCommonSIB during initial access. These embodiments provide a bandwidth configuration scheme for LP-WUS that can enhance the energy saving effect of LP-WUR. In addition, these embodiments can also avoid unnecessary LP-WUS decoding, reduce the complexity of LP-WUR, avoid RF retuning of LP-WUR to synchronize with the network, and / or support UE mobility in LP-WUS mode.

[0059] In some embodiments, a method for performing radio resource management (RRM) measurements by a LP-WUR of a UE includes: configuring to perform RRM measurements. In some embodiments, the method further includes a relaxation process for RRM measurements based on LP-WUR, wherein the RRM relaxation includes performing RRM measurements only when the minimum threshold and maximum threshold of the RRM measurements change, and sending a report to the network through the MR of the UE. In some embodiments, the method also includes RRM measurements based on UE groups, wherein one UE in a UE group performs RRM measurements in a first RRM cycle, and another UE performs RRM measurements in a second RRM cycle, wherein the RRM measurements performed by a single UE in one cycle are considered to be applicable to the entire UE group. In some embodiments, the method also includes RRM measurements based on LP-WUS. These embodiments provide an RRM measurement relaxation scheme based on LP-WUR, which helps to improve the energy-saving performance of LP-WUR. In addition, these embodiments can also avoid unnecessary LP-WUS decoding, reduce the complexity of LP-WUR, avoid RF retuning of LP-WUR for synchronization with the network, and / or support the mobility of UE in LP-WUS mode.

[0060] According to the goal of SID[1], which is to achieve low-power WUS / WUR design mainly for small devices that are sensitive to power consumption (including industrial sensors, controllers and other IoT application scenarios and wearable devices), LP-WUS should be characterized by low power consumption and support a simplified detection process on the LP-WUR side, thereby achieving low complexity of the LP-WUR architecture. In order to achieve this goal, this application discusses and proposes a variety of methods for reducing the power consumption of LP-WUR when detecting and decoding LP-WUS. Example 1 explains the LP-WUR monitoring process for LP-WUS detection; Example 2 focuses on the bandwidth configuration and dedicated BWP of LP-WUS transmission; Example 3 explores the strategy of further relaxing the RRM measurement of LP-WUR based on the existing RRM relaxation of the specification.

[0061] Example 1: LP-WUS / LP-WUR monitoring process

[0062] As mentioned above, the monitoring behavior of LP-WUR during the detection of LP-WUS has a significant impact on its power consumption. In order to optimize the monitoring behavior of LP-WUR during the LP-WUS detection / decoding process, this embodiment proposes several methods based on traditional UE monitoring behavior (e.g., continuous monitoring or duty cycle-based monitoring) for downlink data / signaling scenarios to reduce the power consumption of LP-WUR.

[0063] LP-WUR's ongoing monitoring activities:

[0064] The continuous monitoring behavior of LP-WUR consumes power to detect LP-WUS, and the power consumption increases in the following two cases: 1. Unnecessary decoding of each LP-WUS is performed to determine whether the LP-WUS is sent for a specific UE; 2. Even if the network does not send LP-WUS, LP-WUR continues to monitor the presence of LP-WUS.

[0065] In order to reduce the power consumption of LP-WUR during the LP-WUS detection process and avoid unnecessary decoding of each LP-WUS, this embodiment proposes: only when the UE is triggered to wake up by the network, the monitoring behavior of LP-WUR for LP-WUS detection is enabled; and in the time period from the first trigger to the time when the UE is triggered to wake up by the network again, the continuous monitoring behavior of LP-WUR is disabled.

[0066] How to enable and disable LP-WUR continuous monitoring behavior is described below.

[0067] Enable and disable LP-WUR continuous monitoring behavior via a bitmap in LP-SS:

[0068] This embodiment proposes that the continuous monitoring behavior of LP-WUR on LP-WUS can be enabled / activated or disabled / deactivated through a bitmap in the low power synchronization signal (LP-SS) payload. According to the discussion in the 3GPP RAN1#111 meeting, periodic LP-SS may be used for LP-WUR of a UE or UE group to synchronize time / frequency with the network. Therefore, LP-SS may be used to carry additional payload information to enable and disable LP-WUR monitoring of LP-WUS, such as Figure 6 shown.

[0069] The information carried by LP-SS for enabling / disabling LP-WUR monitoring of LP-WUS can be in the form of a bitmap, in which each bit is allocated to a certain UE or UE group in ascending order of UE ID or UE group ID, and the bitmap takes effect when these UEs enter LP-WUS mode. The length of the load can be defined as X bits, where X is the total number of bits for enabling / disabling the function, and its possible value range is {2, 4, 8} bits. If the amount of information carried in the actual load is less than the total number of bits, the remaining unused bits can be regarded as reserved bits. For example: if the load length is 8 bits and 4 UEs enter LP-WUS mode, then the allocation of these bits can be based on UE ID or UE index number, and their arrangement in the load is shown in Table 1.

[0070] Table 1: Bits allocated to UE in LP-SS payload

[0071] Bit positions in LP-SS payload Allocated UE / Reserved bits Bit 1 UE ID 0 Bit 2 UE ID 1 Bit 3 UE ID 2 Bit 4 UE ID 3 Bit 5 reserve Bit 6 reserve Bit 7 reserve The 8th bit reserve

[0072] In addition, when the bit value is 1, the LP-WUR monitoring of the upcoming LP-WUS can be enabled; when the bit value is 0, the LP-WUR continuous monitoring of the LP-WUS can be disabled or deactivated. For example, suppose there are four UEs in LP-WUS mode, of which the LP-WUR monitoring of the first three UEs needs to be enabled, and the LP-WUR monitoring of the last UE needs to be disabled. Then, the information transmitted in the LP-SS load is used to enable / disable the LP-WUR monitoring of the UE as shown in Table 2 below.

[0073] Table 2: UE LP-WUR monitoring enabled / disabled

[0074]

[0075]

[0076] In addition, the enabling and disabling of the LP-WUR monitoring behavior of the UE can also be performed based on the UE grouping. For example, the UEs in LP-WUS mode are divided into 4 groups, of which the UEs in the first 3 groups need to enable LP-WUR monitoring, while the UEs in the fourth group need to disable LP-WUR monitoring. The load bitmap of LP-SS can carry such information, and each bit corresponds to a UE group, which is used to enable or disable LP-WUR monitoring of the UEs in the group for LP-WUS detection, as shown in Table 3.

[0077] Table 3: Enable / disable LP-WUR monitoring in LP-WUS detection for UE groups

[0078] Bit value Assigned UE Group LP-WUR Enable / Disable Status 1 UE group 0 Enable 1 UE group 1 Enable 1 UE group 2 Enable 0 UE group 3 Disable

[0079] Enable / disable the energy saving benefits of LP-WUR monitoring behavior:

[0080] As mentioned above, the information to enable / disable the LP-WUR monitoring behavior can be carried by periodic LP-SS. Therefore, the LP-WUR of the UE or UE group can decode the LP-SS periodically to enable or disable the LP-WUR's continuous monitoring behavior for LP-WUS detection. As a result, the LP-WUR only needs to monitor the LP-SS periodically and perform LP-WUS detection only at specific configuration times when the network activates the monitoring function through the LP-SS. This behavior can avoid the LP-WUR from continuously performing LP-WUS detection and avoid unnecessary decoding of each LP-WUS, such as Figure 7 Therefore, by enabling / disabling the LP-WUR continuous monitoring behavior, the energy saving effect of LP-WUR during the LP-WUS detection and decoding process can be effectively improved.

[0081] Enable and disable LP-WUR continuous monitoring behavior based on MR on / off status:

[0082] Another method for enabling and disabling the continuous monitoring behavior of LP-WUR is based on the MR on / off state of the UE. In this embodiment, when the MR of the UE is in the on state, the monitoring behavior of the LP-WUR of the UE for the LP-WUS is deemed to be disabled until the MR is still in the on state; conversely, when the MR of the UE is in the off state, the monitoring behavior of the LP-WUR of the UE for the LP-WUS is deemed to be enabled. For example, when LP-WUR triggers MR awakening, since the MR has been awakened, the UE can use the on state of the MR to disable the monitoring behavior of LP-WUR for the LP-WUS until the MR is still in the on state, such as Figure 8 shown.

[0083] Advantages: This method does not require the gNB to send any additional signaling or carry additional load information to enable / disable LP-WUS detection by LP-WUR monitoring behavior.

[0084] Disabled events for LP-WUR / WUS monitoring:

[0085] This embodiment proposes a method for enabling the gNB to know that the LP-WUS has been successfully detected and decoded by the LP-WUR of the UE, and accordingly to perform a disabling operation on the LP-WUR monitoring behavior. To this end, an indication mechanism can be used, in which the gNB receives an indication message from the MR of the UE, indicating that the LP-WUS has been successfully received and decoded by the LP-WUR of the UE. The indication message may be based on an ACK message (such as HARQ-ACK) sent by the MR of the UE. In this way, the gNB can disable the LP-WUR monitoring behavior of the UE and stop repeatedly sending LP-WUS to the specific UE.

[0086] The UE may indicate to the gNB that the LP-WUS has been successfully decoded by implicit indication or explicit indication, as follows:

[0087] Implicit Indication: In implicit indication, the gNB can implicitly infer that the LP-WUS has been received by receiving the first ACK message sent by the UE's MR. In this method, the gNB sends data / signaling to the UE after sending the LP-WUS. When the gNB receives the ACK message for the signaling, it can implicitly determine from the first ACK message sent by the MR that the UE has successfully received the LP-WUS, such as Fig. 9 In this way, the gNB can stop repeatedly sending LP-WUS to this specific UE and disable the LP-WUR monitoring behavior of the UE for LP-WUS.

[0088] The advantage of implicit indication is that it can reduce the false alarm rate of ACK messages. For example, if the LP-WUR of the UE mistakenly decodes the noise signal as LP-WUS and triggers MR wake-up, the gNB will not receive any wrong ACK message and think that the UE has been awakened. However, in this case, if the gNB sends data / signaling without knowing the current switch state of the MR, it may still cause waste of physical resources (such as time / frequency resources).

[0089] Explicit indication: For explicit indication, when LP-WUS triggers MR wake-up, MR can send an ACK message to gNB to inform gNB that LP-WUS has been successfully received. After gNB receives the first ACK message from UE, it can send data / signaling to the UE, such as Fig.10 As shown. However, for this purpose, a new ACK message format may need to be introduced. Explicitly indicating the reception status of LP-WUS can improve resource utilization. However, if the LP-WUR of the UE misjudges noise as LP-WUS and sends an ACK message, the false alarm rate of the ACK message may increase.

[0090] In addition, in the scenario where the UE explicitly indicates the LP-WUS detection result to the gNB, a timer-based solution can be adopted: the gNB starts a timer when sending the LP-WUS to the UE. If the UE fails to detect or decode the LP-WUS and the gNB does not receive an ACK message from the MR of the UE before the timer expires, the gNB can re-send the LP-WUS for the specific UE or UE group, such as Fig.11 In this solution, when the gNB receives the ACK message sent by the UE's MR, it can be determined that the LP-WUS has been successfully received and the timer is terminated, as shown in Fig.11 This timer-based solution helps improve the reliability of the LP-WUS process.

[0091] Duty cycle monitoring behavior of LP-WUR to LP-WUS:

[0092] In this embodiment, the duty cycle monitoring behavior of LP-WUR for LP-WUS detection can be derived based on the existing DRX and eDRX configurations in the current specification. For example, if the DRX on duration configured for the UE is 1280 milliseconds, the duty cycle-based monitoring behavior of LP-WUR can be in the on state within 1280 milliseconds. In addition, in order to avoid a mismatch between the triggering timing of LP-SS or LP-WUS and the DRX on period based on duty cycle monitoring of LP-WUR, the periodicity of LP-SS and LP-WUS can be defined according to the DRX cycle configured for the UE.

[0093] Example 2: Bandwidth Configuration of LP-WUS

[0094] This embodiment discusses how to reduce the power consumption of LP-WUR by configuring a dedicated BWP in a certain activated downlink bandwidth part (DL BWP) or for LP-WUS. According to the basic requirements of LP-WUR / LP-WUS, since the architecture of LP-WUR is much simpler than the main radio (MR), LP-WUR cannot decode the existing CD-SSB to synchronize with the network, and a new synchronization signal (such as LP-SS) may be required to achieve synchronization of LP-WUR. The transmission of LP-SS and LP-WUS depends on the scheduling implementation of gNB. In some cases, LP-SS and LP-WUS may be sent in different activated DL BWPs, for example, LP-SS is sent in the initial DL BWP, and LP-WUS is sent in another activated DL BWP, such as Fig.12 In this case, the LP-WUR needs to frequently perform radio frequency (RF) re-tuning to receive the LP-SS for synchronization, such as Fig.12 This behavior increases the power consumption of the LP-WUR and prolongs the synchronization process due to the BWP switching delay.

[0095] In addition, the physical resource block (PRB) resource allocation to the LP-WUS is determined by the gNB scheduling implementation. In other words, the gNB may allocate any PRB to the LP-WUS in the activated DL BWP without considering the reception bandwidth of the LP-WUR. Since the LP-WUS cannot occupy the entire activated DL BWP and the UE's LP-WUR cannot know the PRBs used by the LP-WUS in advance, the LP-WUR needs to search the entire BWP to decode the LP-WUS, such as Fig.13 In this case, the decoding performance of LP-WUS will be degraded, and LP-WUR will consume more power to find the precise frequency position of LP-WUS.

[0096] In order to solve the power consumption problem caused by the above two problems (i.e., LP-SS and LP-WUS belong to different DL BWPs and the bandwidth required by LP-WUS is small), the present application proposes the following two solutions:

[0097] Option 1:

[0098] The gNB can configure a PRB bandwidth at a specific frequency position for LP-WUS. The configured LP-WUS bandwidth PRB can be allocated at the lower edge or upper edge of the cell carrier bandwidth, such as Fig.14As shown. Configuring the LP-WUS bandwidth in the edge PRB area can minimize resource waste and avoid spectrum "holes" between traditional NR channels. In addition, when LP-WUS is not transmitted, these configured PRBs can also be reused for other traditional NR channels or signaling. However, when LP-WUS needs to be transmitted, the PRB configured for LP-WUS should be used for transmission first. At the same time, LP-WUS should not be sent to PRBs outside the configured range to reduce the power consumption of LP-WUR for detecting LP-WUS. This bandwidth configuration can be completed through RRC configuration or through SIBx during the initial access phase of the UE.

[0099] Option 2:

[0100] Another feasible solution is to configure a dedicated downlink BWP for LP-WUS and LP-SS, whose maximum bandwidth does not exceed the bandwidth required by LP-WUS. Since this independent downlink BWP contains the LP-SS used for LP-WUR to synchronize with the network and the LP-WUS used to trigger MR to receive data / signaling, the LP-WUR does not need to perform RF retuning to receive LP-SS. In addition, the LP-WUR only needs to search for LP-WUS within a very specific bandwidth range, further reducing power consumption. The bandwidth configuration of this dedicated downlink BWP should match the UE reception bandwidth required by LP-WUR, for example, not greater than X MHz (X can be a value between 5MHz and 20MHz). This independent DL BWP can be configured through DownlinkConfigCommonSIB during the initial access process, as shown in the following information element (IE).

[0101] IE:

[0102]

[0103]

[0104] Example 3: RRM relaxation

[0105] Radio Resource Management (RRM) measurements include serving cell measurements and neighboring cell measurements, which are used to support the mobility of user equipment. According to existing specifications, serving cell measurements are required to be performed at least once in each DRX cycle. However, in the UE receiver architecture of Rel-18, the UE's main radio (MR) is in an ultra-deep sleep state until it is triggered to wake up by the network through LP-WUS. Therefore, if the MR needs to be woken up for RRM measurements in each DRX cycle, it will be prevented from entering the ultra-deep sleep state, thereby losing the energy-saving advantages brought by LP-WUS / LP-WUR. Therefore, it is necessary to move some RRM functions to the LP-WUR of the UE to maintain the ultra-deep sleep state of the MR, and implement RRM measurements and mobility support through LP-WUR, as discussed in the 3GPP RAN1#111 meeting. However, since the LP-WUR architecture is relatively simple, it may not be able to support the decoding of existing reference signals to perform RRM measurements. Therefore, new reference signals such as the LP-SS mentioned above can be used by LP-WUR to perform RRM measurements. Nevertheless, further relaxation is still needed based on the existing relaxed RRM measurements (see discussion in TR 38.380) to maintain the low power consumption characteristics of LP-WUR.

[0106] This embodiment proposes the following RRM measurement relaxation rules:

[0107] (1) Measurement only:

[0108] To support mobility (such as handover, cell selection and reselection), RRM usually includes two main activities: measurement and reporting. Since the LP-WUR architecture only supports reception functions (to keep the design simple), it is recommended to limit the RRM activities of LP-WUR to "measurement only". When reporting is required (for example, RSRP / RSRQ values ​​change), LP-WUR can trigger MR wake-up and MR to perform RRM reporting to gNB / network. In order to further reduce the reporting frequency to gNB / network, a set of RSRP / RSRQ threshold ranges can be defined, that is, [X1…Xn], where X1 is the minimum threshold value and Xn is the maximum threshold value. The UE only performs reporting when the RSRP / RSRQ value exceeds this range (lower than X1 or higher than Xn). This can reduce the reporting frequency and the number of MR wake-ups, thereby improving the overall UE energy saving effect.

[0109] (2) RRM relaxation based on UE groups:

[0110] This solution is more suitable for static UE devices, such as industrial wireless sensors. In this solution, several static UEs can be divided into a group according to their geographical location, and a relaxed RRM measurement period is set for the UEs in this group. In each RRM measurement period, only one UE in the group performs RRM measurement, and its results can represent all UEs in the group. For example, 4 UEs are grouped together, an RRM measurement period is defined, and each UE performs a measurement every 3 RRM periods, as shown in Table 4 below.

[0111] Table 4: RRM measurements based on UE groups

[0112]

[0113]

[0114] In this way, the RRM measurement of each UE can be relaxed in the time domain, for example, in this example, an RRM measurement is performed once every three RRM measurement cycles. When the number of UEs in the RRM measurement group increases, the degree of relaxation of the RRM measurement based on the UE group can also be further improved.

[0115] (3) RRM measurement based on LP-WUS:

[0116] Since the LP-WUS of the UE can be configured for a specific time period as needed, performing RRM measurements based on the LP-WUS itself can further relax the RRM measurement requirements of the LP-WUR.

[0117] Fig.15 A block diagram of a UE for wireless communication according to an embodiment of the present application is shown. UE 1700 includes LP-WUR 1701 and a main radio frequency 1702. UE 1700 is configured to: when triggered to wake up by the network, enable the continuous monitoring behavior of LP-WUR for LP-WUS detection for a period of time; and thereafter disable the continuous monitoring behavior of LP-WUR for LP-WUS until UE 1700 is triggered to wake up by the network again. In addition, UE 1700 is also configured to execute the method described in the above embodiment.

[0118] In summary, this application discusses and proposes a variety of methods to reduce the power consumption of LP-WUR when detecting and decoding low-power wake-up signals (LP-WUS). Some embodiments explain the monitoring process of LP-WUR in LP-WUS detection; some embodiments focus on the bandwidth configuration of LP-WUS transmission and the setting of the dedicated bandwidth part; some embodiments explore the RRM measurement relaxation strategy based on LP-WUR, which is further optimized on the basis of the existing specification RRM relaxation. The LP-WUR power consumption reduction method proposed in this application has the following advantages: 1. Improving the energy-saving effect of LP-WUR; 2. Avoiding unnecessary LP-WUS decoding and reducing the complexity of the LP-WUR architecture; 3. Avoiding LP-WUR from frequently performing RF tuning due to synchronization requirements; 4. Supporting the mobility of UE in LP-WUS mode.

[0119] Fig.16 7 is a block diagram of an exemplary wireless communication system 700 according to an embodiment of the present application. The embodiments described herein may be implemented into a system using any appropriately configured hardware and / or software. Fig.16 A system 700 is shown, which includes a radio frequency (RF) circuit 710, a baseband circuit 720, an application circuit 730, a memory / storage device 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, which are coupled to each other at least as shown. The application circuit 730 may include circuits, such as but not limited to one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors, such as a graphics processor, an application processor. The processor may be coupled to a memory / storage device and configured to execute instructions stored in the memory / storage device to enable various applications and / or operating systems to run on the system.

[0120] While the present disclosure has been described in connection with what is considered to be the most practical and preferred embodiment, it is to be understood that the present disclosure is not limited to the disclosed embodiment, but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

1. A method for monitoring a low power wake-up receiver LP-WUR for detecting a low power wake-up signal LP-WUS, It is characterized in that include: When the user equipment UE is triggered to wake up by the network, the LP-WUR is enabled to continuously monitor the LP-WUS detection for a period of time; as well as During the period from the first triggering to the time when the UE is awakened again by the network triggering, the continuous monitoring behavior of the LP-WUR on the LP-WUS is disabled.

2. The method of LP-WUR monitoring process for LP-WUS detection according to claim 1, It is characterized in that Enabling and disabling the continuous monitoring behavior of the LP-WUR on the LP-WUS is achieved through a bitmap in the payload of the low power synchronization signal LP-SS.

3. The method of LP-WUR monitoring process for LP-WUS detection according to claim 2, It is characterized in that Each bit in the bitmap is allocated to the UE or the UE group according to the UE identifier ID or the group ID of the UE group in an ascending order when the UE enters the LP-WUS mode.

4. The method for LP-WUR monitoring process for LP-WUS detection according to claim 2 or 3, It is characterized in that The length of the payload is defined as X bits, where X is the total number of bits for enabling / disabling the function, and the range is {2, 4, 8} bits.

5. A method for monitoring a LP-WUR process for LP-WUS detection according to any one of claims 2 to 4, It is characterized in that When the amount of information carried in the payload is less than the total bit length of the payload, the remaining unused bits are regarded as reserved bits.

6. A method for LP-WUR monitoring process for LP-WUS detection according to any one of claims 2 to 5, It is characterized in that When the bit value of the bitmap is a first value, the continuous monitoring behavior of the LP-WUR on the LP-WUS is enabled; when the bit value is a second value, the continuous monitoring behavior of the LP-WUR on the LP-WUS is disabled.

7. A method for monitoring a LP-WUR process for LP-WUS detection according to any one of claims 2 to 6, It is characterized in that The LP-WUR enables and disables the continuous monitoring behavior of the LP-WUS based on the UE or the UE group.

8. A method for LP-WUR monitoring process for LP-WUS detection according to any one of claims 2 to 7, It is characterized in that The LP-SS is a periodic LP-SS.

9. The method of LP-WUR monitoring process for LP-WUS detection according to claim 1, It is characterized in that Enabling and disabling the continuous monitoring behavior of the LP-WUR on the LP-WUS is based on the on / off state of the primary radio frequency MR of the UE.

10. The method of LP-WUR monitoring process for LP-WUS detection according to claim 9, It is characterized in that When the MR of the UE is in the turned-on state, the continuous monitoring behavior of the LP-WUR on the LP-WUS is considered inactive until the MR of the UE is turned on.

11. The method for LP-WUR monitoring process for LP-WUS detection according to claim 9 or 10, It is characterized in that When the MR of the UE is in a turned-off state, the continuous monitoring behavior of the LP-WUR on the LP-WUS is considered to be activated.

12. The method of claim 2 for LP-WUR monitoring process for LP-WUS detection, It is characterized in that Enabling and disabling the continuous monitoring behavior of the LP-WUR on the LP-WUS includes: the MR of the UE sends an indication to the network, indicating that the LP-WUR of the UE has successfully received and decoded the LP-WUS.

13. The method of LP-WUR monitoring process for LP-WUS detection according to claim 12, It is characterized in that The indication is used to enable the network to infer successful reception of the LP-WUS from the first ACK message of the MR of the UE after receiving data / signaling.

14. The method of LP-WUR monitoring process for LP-WUS detection according to claim 12, It is characterized in that When the LP-WUS triggers the MR to wake up, the MR sends an ACK message to the network to inform the network that the LP-WUS has been successfully received.

15. The method of LP-WUR monitoring process for LP-WUS detection according to claim 14, It is characterized in that When the UE cannot detect / decode the LP-WUS and the network does not receive any ACK message sent by the MR of the UE before the timer expires, the LP-WUS will be resent for the UE or the UE group.

16. A method for LP-WUR monitoring process for LP-WUS detection according to any one of claims 1 to 15, It is characterized in that The duty cycle of the continuous monitoring behavior of the LP-WUR on the LP-WUS is derived from DRX configuration and / or eDRX configuration.

17. A method for configuring a low power consumption wake-up signal LP-WUS bandwidth for a UE, It is characterized in that include: The LP-WUS is configured with a bandwidth having a defined frequency location.

18. The method for configuring LP-WUS bandwidth for UE according to claim 17, It is characterized in that The LP-WUS bandwidth is configured at the lower edge PRB or the upper edge PRB of the cell carrier bandwidth in the form of physical resource blocks (PRBs).

19. The method for configuring LP-WUS bandwidth for UE according to claim 17 or 18, It is characterized in that The bandwidth configuration of LP-WUS is done during initial access via radio resource control RRC configuration or via system information block x SIBx.

20. The method for configuring LP-WUS bandwidth for UE according to claim 17, It is characterized in that Also includes: The UE receives a downlink bandwidth part BWP dedicated to the LP-WUS and the LP-SS, and the maximum bandwidth is not greater than the required bandwidth of the LP-WUS.

21. The method for configuring LP-WUS bandwidth for UE according to claim 20, It is characterized in that The dedicated downlink BWP is configured to meet the bandwidth requirements of the LP-WUR UE.

22. The method for configuring LP-WUS bandwidth for UE according to claim 21, It is characterized in that The dedicated downlink BWP is configured during initial access via DownlinkConfigCommonSIB.

23. A method for performing radio resource management RRM measurements by a LP-WUR of a UE, It is characterized in that include: Configured to perform RRM measurements.

24. The method for RRM measurement performed by LP-WUR of UE according to claim 23, It is characterized in that Also included is relaxation of RRM based on LP-WUR, wherein the RRM relaxation includes: performing RRM measurement only when the minimum and maximum thresholds of RRM measurement change, and sending a report to the network through the MR of the UE.

25. The method for RRM measurement performed by LP-WUR of UE according to claim 23, It is characterized in that It also includes the RRM measurement based on the UE group, wherein the RRM measurement is performed by one UE in the UE group in a first RRM cycle, and the RRM measurement is performed by another UE in the UE group in a second RRM cycle, wherein the RRM measurement performed by a single UE in one RRM cycle is deemed to be applicable to the UE group.

26. The method for RRM measurement performed by LP-WUR of UE according to claim 23, It is characterized in that Also included is the RRM measurement based on the LP-WUS.

27. A user equipment UE, It is characterized in that include: Memory; Transceiver; as well as a processor coupled to the memory and the transceiver; The processor is configured to execute the method according to any one of claims 1 to 26.

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