A method for measuring radio resource management
By employing low-power wake-up signals and a layered processing method, RRM measurements are optimized to enhance energy and spectral efficiency, addressing the limitations of traditional methods in 5G networks.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ULAK HABERLESME ANONIM SIRKETI
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-02
AI Technical Summary
Traditional RRM measurements via the main radio in user equipment consume high energy, require significant processing power, and create spectral efficiency limitations, especially in 5G networks with wide frequency bands and dense deployments, leading to battery life reduction and network performance degradation.
Perform RRM measurements using low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) through a low-power wake-up receiver (LP-WuR) or main radio (MR), dividing the coverage area into layers for efficient signal processing and reporting success statuses to determine which receiver performs measurements based on location.
This approach enhances energy efficiency and spectral efficiency by optimizing RRM processes, reducing unnecessary measurements, and improving location determination precision in mobile communication networks.
Smart Images
Figure TR2025050823_02072026_PF_FP_ABST
Abstract
Description
[0001] DESCRIPTION
[0002] A METHOD FOR MEASURING RADIO RESOURCE MANAGEMENT
[0003] TECHNICAL FIELD
[0004] The invention relates to a method that enables effective performance of radio resource management (RRM) measurements using low power wake-up signals (LP-WuS) or low power synchronization signals (LP-SS).
[0005] PRIOR ART
[0006] Radio Resource Management (RRM) is a critical function in mobile communication networks, encompassing measurement and decision processes to optimize the overall performance of user equipment (UE) and the network. RRM enables the regulation of resource allocation, management of handover processes and provision of network load balance by evaluating metrics such as signal strength, link quality and status of spectral resources in cellular networks. These measurements are performed by periodically collecting and analyzing the signals received from various units of the network. In particular, metrics such as Reference Signal Receive Power (RSRP), Reference Signal Receive Quality (RSRQ) and Signal-to-Noise Ratio (SINR) are widely used to evaluate the link quality of the user equipment.
[0007] Traditional RRM measurements are performed via the main radio (MR) located in the user equipment. The main radio enables the measurement of signals from both the cells it serves and the neighboring cells, thus providing the acquisition of the necessary data set for handover decisions and spectral resource allocation. However, this method comes with certain disadvantages. The main radio causes high energy consumption when it is constantly active. Especially in 5G and later generation technologies, the use of wide frequency bands and dense cellular network deployments further increases the energy consumption of the main radio, which leads to a shortening of the battery life of the user equipment. This approach is insufficient to meet the energy efficiency requirements.RRM measurements performed by the main radio also create unnecessary data processing overhead. Although the handover requirement is quite low when the user equipment is in a close location to the base station or is not moving, periodic measurements are continued. Measurements in such situations only consume resources without contributing to network performance. In addition, these measurements performed via the main radio require high processing power in the user equipment. This leads to heating of the devices and further increase in energy consumption.
[0008] In terms of spectral efficiency, the measurements performed by the base radio create limitations on the network. Each measurement requires data to be exchanged between base stations and user equipment, placing additional burden on the network. For example, measurements of signal strength and connection quality are processed and transmitted digitally, and this process increases the bandwidth requirement. This causes delays in data transmission and decreases in network performance, especially in regions with heavy network traffic. Furthermore, in 5G technologies, where multiple frequency bands and beams need to be evaluated, measurements over the trunked radio become more complex, further increasing the burden on the network.
[0009] As a result, performing RRM measurements via the main radio creates significant disadvantages such as high energy consumption, processing power requirements and spectral efficiency limitations. These limitations necessitate the development of alternative solutions, especially for improving the energy efficiency of mobile devices. These shortcomings in traditional methods pave the way for the research and implementation of innovative technologies such as low-power wake-up signals and wake-up receivers and encourage the development of more efficient methods.
[0010] Application number US2023421222A1 discloses a wireless communication method at a user equipment (UE) involves conducting one or more Radio Resource Management (RRM) measurements on a Low-Power Reference Signal (LP-RS) from at least one cell. The method also includes selecting a cell to camp on based on the RRM measurements taken from the LP-RS. This invention proposes that all the neighbouring BSs transmit a reference signal LP-RS like the 5G NR reference signalsthat are used for handover. However, this invention also considers that the LP-WuR conduct the same RRM metrics on LP-WuS the same as it was done by the main radio on reference signals.
[0011] Application number W02024045082A1 discloses a wireless communication method and device. A first communication device can establish a Radio Resource Management (RRM) measurement state based on either a Wake-Up Radio (WUR) signal or a Radio Link Monitoring (RLM) result. This approach allows the primary receiver of the first communication device to decrease the frequency of RRM measurements on a serving cell, leading to reduced energy consumption. The method involves the first communication device determining the RRM measurement state using the first information, which could be either a WUR signal or an RLM result. While this innovation states that the RRM measures are performed by the LP-WuR and reported by the BS, it assumes that the LP-WuR conducts the same RRM metrics on LP-WuS as the main radio does on reference signals.
[0012] All the problems mentioned above have made it necessary to make an innovation in the relevant technical field as a result.
[0013] BRIEF DESCRIPTION OF THE INVENTION
[0014] The present invention relates to a method to eliminate the above-mentioned disadvantages and bring new advantages to the relevant technical field.
[0015] An object of the invention is to provide a method that enables radio resource management (RRM) measurements to be performed in a way that provides high energy efficiency and low processing load.
[0016] Another purpose of the invention is to provide a method that allows the use of spectral resources used for radio resource management (RRM) measurements to be optimized.To achieve all the objects mentioned above and that will emerge from the following detailed description, a method to enable a radio resource management (RRM) measurement by a user equipment receiving low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) periodically transmitted from a base station to be performed by a low-power wake-up receiver (LP-WuR) or master radio (MR), depending on the location of the user equipment in coverage area. Accordingly, it comprises the steps of dividing the coverage area of base station into two regions, a first region where low power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) signals are reliable and a second region containing normal cellular coverage area, dividing the first region into a first layer which is the energy detection layer, a second layer which is the correlation layer, a third layer which is the FFT layer, a fourth layer which is the bit level layer, obtaining measurement data as a result of sequential measurement of signals received by the low-power wake-up receiver (LP-WuR) in each layer, determining a success status for each layer as a result of comparing the measurement data by the low-power wake-up receiver (LP-WuR) with at least one predefined reference data, generating a report containing the success statuses by the low power wake-up receiver (LP-WuR), transmitting the report by the low power wake-up receiver (LP-WuR) to the main radio (MR).
[0017] A possible embodiment of the invention is characterized comprising the steps of; reporting the report to the base station by the main radio (MR), estimating the location of the user equipment in the coverage area according to the success statuses in the report by the base station.
[0018] Another possible embodiment of the invention is characterized comprising the steps of assignment of low power wake-up receiver (LP-WuR) to perform radio resource management (RRM) measurement in case user equipment is determined to be in the first region, assignment of main radio (MR) to perform radio resource management (RRM) measurement in case user equipment is determined to be in the second region.
[0019] Another possible embodiment of the invention is characterized comprising the steps of, measuring the energy level of the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the first layer, comparing the measuredenergy level with a reference energy level, evaluating success if the signal energy level is detected to be greater than the reference energy level, evaluating unsuccessful if the signal energy level is detected to be less than the reference energy level.
[0020] Another possible embodiment of the invention is characterized comprising the steps of, measuring the correlation value of the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the second layer, comparing the measured correlation value with a reference correlation value, evaluating success if the measured correlation value is determined to be greater than a reference correlation value, evaluating unsuccessful if the measured correlation value is determined to be smaller than the the reference correlation value.
[0021] Another possible embodiment of the invention is characterized comprising the steps of, measuring the noise level in the frequency domain with the fast Fourier transform (FFT) of the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the third layer, comparing the measured noise level in the frequency domain with a reference noise level, evaluating success if the measured noise level is detected to be smaller than a reference noise level, evaluating unsuccessful if the measured noise level is detected to be larger than a reference noise level.
[0022] Another possible embodiment of the invention is characterized comprising the steps of, measuring the number of information bits received from the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the fourth layer, comparing the measured information bits with a reference bit number, evaluating success if the number of measured information bits is detected to be greater than a reference bit number, evaluating unsuccessful if the number of measured information bits is detected to be greater than a reference bit number.
[0023] BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 is a drawing illustrating schematic view of the system.Figure 2 is a drawing illustrating schematic view of the radio resource management (RRM) measurements.
[0025] REFERENCE NUMBERS GIVEN IN THE FIGURE
[0026] 10 Base station
[0027] 11 Coverage area
[0028] 12 First region
[0029] 121 First layer
[0030] 122 Second layer
[0031] 123 Third layer
[0032] 124 Fourth layer
[0033] 13 Second region
[0034] 20 User Equipment
[0035] 21 Low-power wake-up receiver
[0036] 22 Main radio
[0037] DETAILED DESCRIPTION OF THE INVENTION
[0038] In this detailed description, the subject matter is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.
[0039] The invention relates to a method that enables more effective performance of radio resource management (RRM) measurements using low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS). The method provides that the radio resource management (RRM) measurement performed by a user equipment (20) receiving low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) periodically transmitted from a base station (10) is performed by the low-power wake-up receiver (LP-WuR) (21 ) or the main radio (MR) (22) depending on the location of the user equipment (20). Thus, efficient use of network resources and energy savings are provided.As shown in Figure 1 , the method firstly provides the separation of the base station’s (10) coverage area (11) into two regions, a first region (12) where low power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) are reliable and a second region (13) containing the normal cellular coverage area (11), in order to determine which receiver will perform the RRM measurements in different regions of the coverage area (11). This separation ensures that the measurements are made more effectively.
[0040] As shown in Figure 2, in the method, the signal processing process in the first region (12) is divided into layers to evaluate the signal state in four stages. The first region (12) is divided into a first layer (121), which is the energy detection layer, a second layer (122), which is the correlation layer, a third layer (123), which is the FFT layer, and a fourth layer (124), which is the bit level layer. The first layer (121 ) involves energy detection. Here, it is checked whether the energy level of the signal exceeds the sensitivity threshold of the receiver. In the first layer (121) the energy level of the LP-WuS or LP-SS signals is measured. The measured energy level is compared with a reference energy level. If it is determined that the energy level of the signal is greater than the reference energy level, it is evaluated as successful. If it is determined that the signal energy level is less than the reference energy level, it is evaluated as unsuccessful.
[0041] As shown in Figure 2, in the second layer (122), the signal is controlled by a predefined reference sequence of the correlation process. In the second layer (122), the correlation value of the LP-WuS or LP-SS signals is measured. The measured correlation value is compared with a reference correlation value. If the measured correlation value is determined to be greater than a reference correlation value, it is evaluated as successful. If the measured correlation value is determined to be smaller than the reference correlation value, it is evaluated as unsuccessful.
[0042] As shown in Figure 2, in the third layer (123), the noise level of the signal in the frequency domain is analyzed with the Fast Fourier Transform (FFT). In the third layer (123), the noise level in the frequency domain is measured with the fast Fourier transform (FFT) of the LP-WuS or LP-SS signals. The measured noise level in thefrequency domain is compared with a reference noise level. If the measured noise level is determined to be less than a reference noise level, it is evaluated as successful. If the measured noise level is detected to be greater than a reference noise level, it is evaluated as unsuccessful.
[0043] As shown in Figure 2, in the fourth layer (124), the information bits received from the signal are analyzed. In the fourth layer (124), the number of information bit received from the LP-WuS or LP-SS signals is measured. The measured number of information bit is compared with a reference bit number. If the measured number of information bit is determined to be less than a reference bit number, it is evaluated as successful. If the measured number of information bit is detected to be greater than a reference bit number, it is evaluated as unsuccessful. These measurements in layers are made by low-power wake-up receiver (LP-WuR) (21).
[0044] As shown in Figure 2, after the layer measurements are performed, a report is created by LP-WuR that includes the success status as a result of these evaluations made in each layer. The report is transmitted to the base station (10) via the main radio (22). Thus, the base station (10) can estimate from the report whether the user equipment (20) is in the first region (12) or second region (13). If it is determined that the user equipment (20) is in the first region (12), the low-power wake-up receiver (LP-WuR) (21) is assigned to perform the radio resource management (RRM) measurement. If it is determined that the user equipment (20) is in the second region (13), the main radio (MR) (22) is assigned to perform the radio resource management (RRM) measurement. This assignment is made by the user equipment (20).
[0045] As shown in Figure 2, each of the signal processing layers in the first region (12) is associated with the distance of the user equipment (20) from the base station (10). For example, success in all four layers indicates that the user equipment (20) is located in the region closest to the base station (10). Similarly, an increase in failures indicates that the user is approaching the second region (13), i.e. outside the first region (12). When the user equipment (20) leaves the first region (12), the RRM measurements are automatically started by the main radio (22). This transition mechanism allows theuse of LP-WuR only in regions where reliable signals are received, increasing the efficiency of the measurement processes.
[0046] This method offers significant advantages in terms of energy efficiency in mobile communication networks. Considering the impact of wide frequency bands and dense base station (10) distributions on energy consumption, especially in 5G and beyond technologies, the use of LP-WuR is advantageous. For example, if an loT device performs RRM measurements by listening only to low-power signals, the device can use network resources more efficiently while extending battery life. At the same time, this method prevents the base station (10) from sending signals for unnecessary measurements, increasing the spectral efficiency of the network. In addition, with a multi-layered measurement mechanism that LP-WuR performs over low-power signals, RRM processes can be optimized and the location of user equipment (20) can be determined more precisely.
[0047] In order to achieve all the objects stated above and arising from the above detailed description, the present invention relates to a method to enable a radio resource management (RRM) measurement by a user equipment (20) receiving low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) periodically transmitted from a base station (10) to be performed by a low-power wake-up receiver (LP-WuR) (21) or master radio (MR) (22), depending on the location of the user equipment (20) in coverage area (11). This method is characterized by including the following steps; dividing the coverage area (11) of base station (10) into two regions, a first region (12) where low power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) signals are reliable and a second region (13) containing normal cellular coverage area (11), dividing the first region (12) into a first layer (121) which is the energy detection layer, a second layer (122) which is the correlation layer, a third layer (123) which is the FFT layer, a fourth layer (124) which is the bit level layer, obtaining measurement data as a result of sequential measurement of signals received by the low-power wake-up receiver (LP-WuR) (21) in each layer, determining a success status for each layer as a result of comparing the measurement data by the low-power wake-up receiver (LP-WuR) (21 ) with at least one predefined reference data,generating a report containing the success statuses by the low power wake-up receiver (LP-WuR) (21), transmitting the report by the low power wake-up receiver (LP-WuR) (21) to the main radio (MR) (22).
[0048] A possible embodiment of the invention is that this method includes the steps of reporting the report to the base station (10) by the main radio (MR) (22), estimating the location of the user equipment (20) in the coverage area (11) according to the success statuses in the report by the base station (10).
[0049] A possible embodiment of the invention is that this method includes the steps of assignment of low power wake-up receiver (LP-WuR) (21) to perform radio resource management (RRM) measurement in case user equipment (20) is determined to be in the first region (12), assignment of main radio (MR) (22) to perform radio resource management (RRM) measurement in case user equipment (20) is determined to be in the second region (13).
[0050] A possible embodiment of the invention is that this method includes the step of measuring the energy level of the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the first layer (121), comparing the measured energy level with a reference energy level, evaluating success if the signal energy level is detected to be greater than the reference energy level, evaluating unsuccessful if the signal energy level is detected to be less than the reference energy level.
[0051] A possible embodiment of the invention is that by further comprising the step of measuring the correlation value of the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the second layer (122), comparing the measured correlation value with a reference correlation value, evaluating success if the measured correlation value is determined to be greater than a reference correlation value, evaluating unsuccessful if the measured correlation value is determined to be smaller than the reference correlation value.
[0052] A possible embodiment of the invention is that by further comprising the step of measuring the noise level in the frequency domain with the fast Fourier transform (FFT)of the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the third layer (123), comparing the measured noise level in the frequency domain with a reference noise level, evaluating success if the measured noise level is detected to be smaller than a reference noise level, evaluating unsuccessful if the measured noise level is detected to be larger than a reference noise level.
[0053] A possible embodiment of the invention is that by further comprising the step of measuring the number of information bits received from the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the fourth layer (124), comparing the measured information bits with a reference bit number, evaluating success if the number of measured information bits is detected to be greater than a reference bit number, evaluating unsuccessful if the number of measured information bits is detected to be greater than a reference bit number.
[0054] The scope of protection of the invention is specified in the attached claims and cannot be limited to those explained for sampling purposes in this detailed description. It is evident that a person skilled in the art may exhibit similar embodiments in light of the above-mentioned facts without drifting apart from the main theme of the invention.
Claims
CLAIMS1. A method to enable a radio resource management (RRM) measurement by a user equipment (20) receiving low-power wake-up signals (LP-WuS) or low- power synchronization signals (LP-SS) periodically transmitted from a base station (10) to be performed by a low-power wake-up receiver (LP-WuR) (21) or master radio (MR), depending on the location of the user equipment (20) in coverage area (11 ) characterized in that it comprises the steps of- dividing the coverage area (11) of base station (10) into two regions, a first region (12) where low power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) signals are reliable and a second region (13) containing normal cellular coverage area (11),- dividing the first region (12) into a first layer (121 ) which is the energy detection layer, a second layer (122) which is the correlation layer, a third layer (123) which is the FFT layer, a fourth layer (124) which is the bit level layer,- obtaining measurement data as a result of sequential measurement of signals received by the low-power wake-up receiver (LP-WuR) (21) in each layer, - determining a success status for each layer as a result of comparing the measurement data by the low-power wake-up receiver (LP-WuR) (21) with at least one predefined reference data,- generating a report containing the success statuses by the low power wake-up receiver (LP-WuR) (21),- transmitting the report by the low power wake-up receiver (LP-WuR) (21 ) to the main radio (MR) (22).
2. The method according to claim 1 , characterized in that it comprises the steps of - reporting the report to the base station (10) by the main radio (MR) (22), - estimating the location of the user equipment (20) in the coverage area (11) according to the success statuses in the report by the base station (10).
3. The method according to claim 1 , characterized in that it comprises the steps of- assignment of low power wake-up receiver (LP-WuR) (21) to perform radio resource management (RRM) measurement in case user equipment (20) is determined to be in the first region (12),- assignment of main radio (MR) (22) to perform radio resource management (RRM) measurement in case user equipment (20) is determined to be in the second region (13).
4. The method according to claim 1 , characterized in that it comprises the steps of - measuring the energy level of the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the first layer (121),- comparing the measured energy level with a reference energy level,- evaluating success if the signal energy level is detected to be greater than the reference energy level,- evaluating unsuccessful if the signal energy level is detected to be less than the reference energy level.
5. The method according to claim 1 , characterized in that it comprises the steps of - measuring the correlation value of the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the second layer (122), - comparing the measured correlation value with a reference correlation value, - evaluating success if the measured correlation value is determined to be greater than a reference correlation value,- evaluating unsuccessful if the measured correlation value is determined to be smaller than the reference correlation value.
6. The method according to claim 1 , characterized in that it comprises the steps of - measuring the noise level in the frequency domain with the fast Fourier transform (FFT) of the low-power wake-up signals (LP-WuS) or low-power synchronization signals (LP-SS) in the third layer (123),- comparing the measured noise level in the frequency domain with a reference noise level,- evaluating success if the measured noise level is detected to be smaller than a reference noise level,- evaluating unsuccessful if the measured noise level is detected to be larger than a reference noise level.
7. The method according to claim 1 , characterized in that it comprises the steps of - measuring the number of information bits received from the low-power wakeup signals (LP-WuS) or low-power synchronization signals (LP-SS) in the fourth layer (124),- comparing the measured information bits with a reference bit number, - evaluating success if the number of measured information bits is detected to be greater than a reference bit number,- evaluating unsuccessful if the number of measured information bits is detected to be greater than a reference bit number.