TWI713392B - Methods on radio resource management and radio link monitoring configurations and procedures - Google Patents

Abstract

Methods on radio resource management (RRM) configurations and procedures in wireless communication are described herein. In particular, methods are described for providing a reference signal strength indicator (RSSI) measurement timing configuration (RMTC). In some embodiments, a UE may perform a RSSI measurement based on the RMTC on at least on downlink (DL) symbol outside of a synchronization signal (SS) block. Also described herein are methods for inter-frequency SSB measurement, and methods for RLM configurations and procedures. The methods on RRM and RLM configurations and procedures of the present invention can improve the user experience.

Description

Method for wireless resource management and wireless link monitoring configuration and process

The invention relates to a method and device in mobile communication. In particular, the present invention relates to the configuration and process of radio resource management (RRM) and radio link monitoring (RLM).

In a wireless communication system, user equipment (UE) such as a wireless device can communicate with one or more network components to send and receive information representing data, voice, and control signals. The wireless communication system can use RRM technology to measure the signal strength of the serving cell and neighboring cells. RLM measurement can evaluate radio link failure by measuring the link quality of the serving cell. During operation, the network element periodically sends a reference signal that the UE can measure. When the UE's receiver is tuned to the frequency of the first cell and a second cell broadcast on a different frequency is available, the network element can schedule the measurement interval so that the UE can tune its receiver to the frequency of the second cell, To perform inter-frequency measurement on the second cell. In LTE, regardless of the traffic activity in the cell, the cell will continuously send cell-specific reference signals and broadcast system information. RRM can be based on a discovery reference signal (DRS). In LTE, DRS is composed of a combination of existing signals, for example, a synchronization signal (SS) that helps to obtain cell identification, coarse frequency, and time synchronization; Cell-specific reference signals (CRS) for frequency and time synchronization; and channel state information (CSI) reference signals (CSI-RS) for identifying transmission points in a cell. The UE may be based on cell identification and RRM measurement, such as reference signal received power (RSRP) and reference signal received quality (RSRQ) on DRS. In order to assist the UE in performing the measurement, the UE can identify the timing configuration to provide information about when and how to measure each physical layer cell identification.

According to some embodiments, a method for wireless communication with user equipment (UE) is provided. The method includes identifying received signal strength indicator (RSSI) measurement timing configuration (RMTC); based on the RMTC, for at least one downlink (downlink) outside the synchronization signal (SS) block received from the first cell , DL) symbol for RSSI measurement.

According to some embodiments, a method for wireless communication with user equipment (UE) for layer 3 mobility is proposed. The method includes identifying the timing configuration of a channel state information reference signal (CSI-RS); and performing radio resource management (RRM) measurements on the CSI-RS based on the timing configuration, wherein the timing configuration at least includes One of the following: indicates the resource configuration of the CSI-RS time or frequency resource location in the time slot, the subframe offset, and the time slot offset relative to the start of transmission of the synchronization signal (SS) burst.

According to some embodiments, a method for wireless communication with a user equipment (UE) is provided. The method includes identifying a radio link monitoring (RLM) configuration; based on the RLM configuration, performing a plurality of RLM measurements on a reference signal (RS). The RLM configuration includes at least one of the following: the first parameter indicating the association between the RS and the control channel, and the second parameter indicating the association between the RS and the in-sync/out-of-synch (in-sync/out-of-synch, IS/OOS) indication parameter.

The method of the present invention for RRM and RLM configuration and processing can improve user experience.

100: mobile communication system

10: User equipment

12: processor

14: Memory

20: Connect

30: network components

200: Transmission

202a, 202b, 202c: symbols

300, 500, 600: method

302, 304, 306, 308, 310, 502, 504, 506, 508, 602, 604, 606, 607, 608, 609, 610, 612, 614: steps

400a: Transmission received from the serving cell

400b: Transmission received from neighboring cell

402: Offset between interval mode and SS burst transmission

404: Start of measurement interval

406: The Beginning of the SS Bundle

Various aspects and embodiments will be described with reference to the following drawings. It should be understood that the illustrations are not necessarily drawn to scale. In the drawings, each identical or almost identical component shown in each figure is represented by the same numeral. For the sake of clarity, not every element will be marked in the illustration.

Figure 1 is a schematic diagram of a mobile communication system 100 applicable to the disclosure of the present invention; Figure 2 is a schematic diagram of a transmission 200 received at a UE according to an embodiment of the present invention; Figure 3 is a schematic diagram of a transmission 200 according to an embodiment of the present invention. A flowchart of a method 300 for a UE to perform wireless communication; Fig. 4 is a schematic diagram of a transmission 400a received from a serving cell and a transmission 400b received from a neighboring cell according to an embodiment of the present invention; Fig. 5 is an embodiment of the present invention The described flow chart of the method 500 for wireless communication with the UE for layer 3 mobility; and FIG. 6 is the flow chart of the method 600 for wireless communication with the UE described according to an embodiment of the present invention.

The following is a list of abbreviations that can be found in the instructions and/or illustrations.

UE 使用者設備

UE User Equipment

The present invention discloses a method and a mobile communication device for providing RRM and RLM configurations and processes, and in particular, a method and a mobile communication device for providing RRM and RLM configurations and processes when using 5G NR technology.

In a mobile communication system, a UE such as a mobile communication device can establish a link with a network element such as a cellular base station called an eNB in LTE or a cellular base station called gNB in 5G. The UE can communicate with network components by sending or receiving voice, data, and/or control signals. Figure 1 is a schematic diagram of a mobile communication system 100 suitable for the disclosure of the present invention. According to some embodiments, the mobile communication system 100 includes a UE 10 that establishes a connection 20 with a network element 30. The UE 10 may be fixed or mobile, and may be referred to as a mobile communication device, a mobile device, a user terminal, a wireless device, a smart phone, or other terms. The UE 10 includes one or more processors 12 and one or more memories 14. At least one memory 14 is configured to store executable instructions or codes. When executed by at least one processor 12, the executable instructions or codes cause the UE 10 to execute one or more methods as described in the full text of the present invention. At least one memory 14 is configured to store data to be sent to or received from the network element. The network element 30 is usually a fixed station, and may be a gNB or an eNB. The network element 30 may be called a base station, a cellular base station, an access point, a cell, and so on. Although the two network elements 30 and the UE 10 are presented in a connected form, it should be understood that the aspects of the present invention are not limited to the scenario shown in Figure 1.

During the execution of the mobile communication system, synchronization signals can be sent in a structure called "SS block". The SS block can be composed of one or more SSs in various configurations. In some cases, other signals such as data symbols can be multiplexed in the SS block. In some cases, a "burst" of one or more SS blocks can be sent, sometimes referred to as SS burst. SS bursts can have various durations, and SS blocks can be continuous or discontinuous within the burst, and can be the same or different. The inventor has recognized and understood that the UE can identify the RRM measurement timing configuration based on the SS block (hereinafter referred to as SMTC) to configure the measurement window period/duration/offset information for RRM measurement based on the SS block. In some In an embodiment, for intra-frequency CONNECTED mode measurement, up to two measurement window periods can be configured. However, in some embodiments, for IDLE mode and inter-frequency CONNECTED mode (inter-frequency CONNECTED mode) measurement, only one SMTC is configured for each frequency band.

The inventor has recognized and understood that when RSSI measurement is performed during the SS block, the measurement may not accurately reflect the cell load and the interference level of data transmission. For example, in a beamforming scenario, the interference level measured from the SSB-RSRQ/SINR will be different from the data transmission, and when the measurement is performed during the SS block, the SSB-RSRQ/SINR cannot reflect the cell load well. According to one aspect of the present invention, in order to solve these problems, the RSSI can be measured from symbols outside the RS symbol or outside the SS block. In some embodiments, a received signal strength indicator (RSSI) measurement timing configuration (RMTC) can be provided. Based on the RMTC, the UE performs RSSI measurement on DL symbols outside the SS block received from the cell. The inventor has recognized and understood that the measurement based on symbols outside the SS block can accurately reflect the data interference level and accurately reflect the cell load. In addition, measuring DL symbols outside of the SS block can allow the UE to measure RSSI without requiring a wide bandwidth.

Figure 2 is a schematic diagram of a transmission 200 received at a UE according to an embodiment of the present invention. According to one aspect of the present invention, the RMTC can configure RSSI measurement on DL symbols 202c outside the SS burst or on DL symbols 202a, 202b inside the SS burst but still outside the SS block.

The RMTC can be provided by the broadcast cell and can be signaled by a higher layer in the UE for the UE to recognize. In some embodiments, the UE can measure the RSSI by averaging the RSSI measurements on the DL symbols specified in the RMTC. In the dynamic beamforming scenario on the control and data channels, the UE can extract the cell-level RSSI by averaging the received power on the DL symbols of the measurement subframe. The UE can also extract the beam-level RSSI associated with one of the plurality of beams by averaging the received power in one or a plurality of QCL OFDM symbols, where the one or more QCL OFDM symbols are QCL to a complex number The beam of the beams.

According to one aspect of the present invention, the start time position (subframe or time slot) of the RSSI measurement can be selected by the UE or indicated by a higher layer through the RMTC. In some embodiments, RMTC can be configured together with SSB measurement timing configuration (SMTC). In some embodiments, the RMTC may include at least all or part of the following: the period of RSSI measurement; the timing offset of RSSI symbols that can be configured in units of symbols, time slots, or subframes; considering that the subcarrier spacing is Different frequency ranges may be different, and the duration of RSSI measurement can be configured in units of SSB symbols within the measured frequency range. For an RSSI measurement, the RMTC also includes a plurality of timing offsets and durations of an RSSI measurement.

In some embodiments, when the measurement interval is configured, the UE does not perform inter-frequency measurement on the symbols of the RSSI configuration outside the measurement interval.

FIG. 3 is a flowchart of a method 300 for wireless communication with a UE according to an embodiment of the present invention. As shown in FIG. 3, in step 302, the method 300 includes identifying a received signal strength indicator (RSSI) measurement timing configuration (RMTC). In step 304, the method 300 includes performing RSSI measurement on at least one downlink (DL) symbol outside the synchronization signal (SS) block received from the first cell based on the RMTC. Optionally, in step 306, during inter-frequency measurement, the method 300 includes determining the start of a measurement interval (MG) associated with the transmission from the first cell. Optionally, in step 308, the method 300 includes identifying the synchronization signal block (SSB) measurement timing configuration (SMTC) that includes the SMTC measurement window timing offset; and starting from the MG with the refined time offset of the MG, The SSB received from the second cell performs SSB measurement. Optionally, in step 310, the method 300 includes starting with the refined time offset MG of the MG, and completing the radio frequency (RF) tuning of the UE from the first frequency to the second frequency.

Aspects of the invention relate to methods for inter-frequency SSB measurement. Figure 4 is a schematic diagram of a transmission 400a received from a serving cell and a transmission 400b received from a neighboring cell according to an embodiment of the present invention. In Figure 4, the serving cell has a frequency (Freq#0) that is different from the frequency (Freq#1) of the neighboring cell (NBR cell). The inventor has recognized and understood that for inter-frequency measurement, the UE needs time Perform RF tuning at intervals. As shown in the example in Figure 4, if the start 404 of the measurement interval in the serving cell is aligned with the start 406 of the SS burst in the neighboring cell on the time axis, the UE will be affected by the time required to perform RF tuning. Missed some SS blocks. According to one aspect of the present invention, it is possible to provide an indication of the MG timing refinement offset in the timing configuration, such as the offset 402 shown in Figure 4, so that the measurement interval pattern of the serving cell starts and the NBR cell A short offset is introduced between SS burst transmissions to allow the UE to perform RF tuning. In some embodiments, the MG timing refinement offset may be configured in units of scheduling units. In a non-limiting example, the MG timing refinement offset can be configured in a unit of a time slot, a unit of a half of a time slot, or a unit of a plurality of symbols. In some embodiments, the MG timing refinement offset may have a time value of less than 1 millisecond, less than 0.5 millisecond, between 0 and 1 millisecond, between 0 and 0.5 millisecond, or between 0.25 and 0.75 millisecond. For example, MG timing refinement offset of 0.25 ms, 0.5 ms or 0.75 ms can be provided.

In some embodiments, the scheduling unit such as the time slot is divided into two parts. The gNB can be configured to schedule data transmission at the front of the time slot. The back part of the time slot can be configured for gNB to send SS blocks. The MG timing refinement offset indication can be configured in SMTC to indicate the timing of one or two parts of the time slot.

In some embodiments, regarding the SMTC and the configured MG timing offset indication, the UE is configured to perform inter-frequency measurement on the SS block. Specifically, the UE is configured to tune the RF of one or more receivers to the frequency after the configured MG timing refinement offset, and at a specific time of the offset from the start of the MG through the MG timing refinement offset Complete the RF tuning before.

Aspects of the present invention relate to methods for providing timing configuration of CSI-RS for Layer 3 (L3) mobility. The inventor has recognized and understood that in the CSI-RS used for L3 mobility, the UE may need the SS block to provide cell detection and process synchronization of timing and frequency in order to measure the CSI-RS. The UE also needs the SS block to provide a TTI (transmission time interval) reference in order to measure CSI-RS. In addition, for inter-frequency measurement, the UE needs a time index to learn the timing of the CSI-RS. It may also require frame timing. According to one aspect of the present invention, in order to solve these requirements, the timing configuration of CSI-RS for L3 mobility can assist in performing CSI-RS measurement when the timing of frames in other frequency bands is unknown. the amount.

In an embodiment, the timing offset of the CSI-RS can be configured as a subframe and a time slot offset. The CSI-RS time/frequency resources in the time slot can be further configured through resource configuration. In such an embodiment, the UE may need to know the frame timing to perform CSI-RS measurement. However, in the inter-frequency measurement, the UE may not know the frame timing of cells in other frequency ranges.

In another embodiment, the timing offset of the CSI-RS can be configured as the time slot offset associated with the SS block. The CSI-RS time/frequency resources in the time slot can be further configured through resource configuration. In this embodiment, it should be understood that the UE may not need to know the frame timing, and the UE needs to know the time index of the SS block to perform CSI-RS measurement based on the associated SS block. However, for some deployments, such as in a multi-TRP (transmission reception point) cell, the CSI-RS may not be associated with a specific SS block.

In another embodiment, the timing offset of the CSI-RS can be configured as the time slot offset at the beginning of the SS burst transmission. The CSI-RS time/frequency resources in the time slot can be further configured through resource configuration. In this embodiment, the UE may need to know the time index of the SS block to learn the start of the SS burst transmission, and the UE can perform measurement on the CSI-RS based on the configured offset.

According to one aspect of the present invention, the timing configuration of CSI-RS for L3 mobility can be provided. The timing configuration may include at least all or part of the following: ‧Resource configuration used to configure the CSI-RS time/frequency resources in the time slot, and ‧Configurable subframe offset and time slot offset, or ‧Configurable Time slot offset to the relevant SS block, or ‧ can be configured to the time slot offset at the beginning of SS burst transmission

Further according to one aspect of the present invention, the UE can perform RRM measurement on CSI-RS through the following process: • In step 1, the UE performs cell detection and synchronizes the process of timing and frequency on the SS block. UE in this Obtain the cell ID after step; ‧Step 2, UE exports the time index of the detected SS block. If the association between the CSI-RS and the SS block is configured, the UE will export the time index of the detected SS block associated with the configured CSI-RS; ‧Step 3. The UE will export the timing reference based on the time index. The timing reference can be the frame or time slot timing exported from the time index of the detected SS block; ‧Step 4, UE performs RRM measurement on timing reference and timing configuration.

FIG. 5 is a flowchart of a method 500 for wireless communication between layer 3 mobility and UE according to an embodiment of the present invention. As shown in FIG. 5, in step 502, the method 500 includes identifying the timing configuration of the channel state information reference signal (CSI-RS). In step 504, the method 500 includes performing radio resource management (RRM) measurements on the CSI-RS based on the timing configuration. Optionally, in step 506, the method 500 further includes performing cell detection to identify cell identification (ID); performing process synchronization to identify the timing and frequency on the SS block. Optionally, in step 508, the method 500 includes determining the time index of the SS block associated with the CSI-RS; and determining the timing reference based on the time index.

Aspects of the present invention relate to methods related to RLM configuration and processing. The inventor has realized and understood that RLM configurations can be provided, which include at least some or all of the following:

‧Configurable power/energy/beamforming/precoding gain offset. The offset can capture the precoding mismatch between the control channel and RLM RS; the offset can also capture the difference between different types of RLM RS (for example, SS block (common control) and CSI-RS (dedicated control)) Beamforming mismatch.

‧Configurable RS type, such as SS block or CSI-RS.

‧The configurable association between the configured RS and the control channel, including at least part or all: spatial QCL or QCL hypothesis, control channel resource set (control channel resource set, CORESET) identification.

‧Configurable association between the configured RS and IS/OOS indication. In some embodiments, the two sets of RS can be used for IS and OOS indication derivation, respectively.

In some embodiments, the control channel may be a dedicated control channel, a public control channel, Group public control channel.

In some embodiments, two CSI-RS for RLM may be configured for the UE. One (CSI-RS # 1) is used for IS, and the other (CSI-RS # 2) is used for OSS. In such an embodiment, configurable power/energy/beamforming/precoding gain offset can be configured in the RLM configuration. In a non-limiting example, for CSI-RS # 1, an offset of 3 dB is provided for IS indication, and an offset of 2 dB is provided for OSS indication, and for CSI-RS # 2, an offset of -2 dB is provided for IS indication. , Provides -3dB offset for OSS indication. It should be understood that the above offset values are provided for illustrative purposes only, and aspects of the present invention are not limited to these values.

In some embodiments, the UE may separately export the radio quality of CSI-RS #1 and CSI-RS #2 based on the measured SINR and IS/OOS offset. In a non-limiting example, for CSI-RS # 1: The measured SINR=10dB, the exported IS radio quality=10dB+3dB=13dB, and the exported OOS radio quality=10dB+2dB=12dB. For CSI-RS # 2: measured SINR=6dB, exported IS radio quality=6dB+-2dB=4dB, exported OOS radio quality=6dB-3dB=3dB. It should be understood that the above offset values are provided for illustrative purposes only, and aspects of the present invention are not limited to these values.

In some embodiments, if the radio quality of all the exported radios on the CSI-RS is worse than a predefined threshold (Q _out ), an OOS indication is sent. In a non-limiting example, if Q _out =12.5dB, since the exported radio quality of all CSI-RS of OOS is (12dB, 3dB)<12.5dB, the UE sends OOS. If one of the exported radio qualities on the CSI-RS is better than a predetermined threshold (Q _in ), then an IS indication is sent. In a non-limiting example, if Q _in =12.5dB, since the outgoing radio quality of CSI-RS #1 of IS is 13dB>12.5dB, the IS is sent by the UE.

FIG. 6 is a flowchart of a method 600 for wireless communication with a UE according to an embodiment of the present invention. As shown in FIG. 6, in step 602, the method 600 includes identifying a radio link monitoring (RLM) configuration; and based on the RLM configuration, performing a plurality of RLM measurements on the reference signal (RS). In steps In 604, the method 600 includes determining the wireless link quality based on a plurality of RLM measurements. In step 606, the method 600 includes comparing the determined wireless link quality with a first predefined threshold value used for exporting IS instructions, and comparing the determined wireless link quality with that used for exporting OOS instructions The second predefined threshold value is compared. In step 607, if the determined radio link quality of the plurality of RLM measurements is higher than the first predefined threshold, the IS indication is sent by the method of step 608. In step 609, if the quality of each of the determined multiple RLM measurements is lower than the second predetermined threshold, the OOS indication is sent by the method in step 610. Optionally, in step 612, the method 600 includes stopping a radio link failure (RLF) timer. Optionally, in step 614, the method 600 includes triggering a radio link failure (RLF) timer.

Therefore, having described several aspects of at least one embodiment of the present invention, it is understandable that various changes, modifications and improvements will be easily conceived by those skilled in the art.

Without departing from the spirit and scope of the present invention, these changes, modifications and improvements fall within the scope of the present invention. In addition, although the advantages of the present invention are pointed out, it should be understood that not every embodiment of the technology described herein includes every advantage described. Some embodiments may not implement any of the features described as advantageous herein. Therefore, the foregoing description and drawings are only examples.

The various aspects of the present invention can be used alone, in combination or in various arrangements not described in detail in the above embodiments, therefore, its application is not limited to the details and arrangements of the components described above or shown in the drawings . For example, aspects described in one embodiment can be combined with aspects described in other embodiments in any manner.

In addition, the present invention can also be embodied as a method of providing examples. Each step as part of the method can be performed in an appropriate order. Therefore, an embodiment can be constructed in which the order of execution of the steps is different from that shown in the figure, and even if the steps are shown as sequential steps in the figure, it may include performing these steps simultaneously.

Modified elements like "first", "second", "third", etc. in the scope of patent application The preface does not mean that it has any priority, priority or the rank of one element is higher than that of another element or the time sequence of method execution, but is only used as a label to distinguish an element with an exact name from an element with the same name (except Modification preface) another element.

In addition, the wording and terms used here are for descriptive purposes and should not be regarded as limiting. The use of "include", "include", "have" or "related" and their variations in the present invention is intended to cover the items listed thereafter and their equivalents and additional items.

200‧‧‧Transmission

202a, 202b, 202c‧‧‧ symbol

Claims (10)

A method for wireless resource management and wireless link monitoring configuration and progress is used for wireless communication with a user equipment. The method includes: identifying a received signal strength indicating measurement timing configuration; and indicating the measurement timing configuration based on the received signal strength , Performing a received signal strength indicator measurement on at least one downlink symbol outside a synchronization signal block received from a first cell. According to the method of wireless resource management and wireless link monitoring configuration and progress described in claim 1, wherein, the at least one downlink symbol is within a synchronization signal burst or outside the synchronization signal burst. The wireless resource management and wireless link monitoring configuration and process method described in claim 1, wherein the received signal strength indication measurement timing configuration is received from the first cell. According to the method of wireless resource management and wireless link monitoring configuration and process described in the first item of the patent application, the received signal strength indicator measurement is an average received signal strength indicator measurement of one of the at least one downlink symbol. The method of radio resource management and radio link monitoring configuration and process described in item 4 of the patent application further includes receiving a plurality of beams from the first cell, wherein the at least one downlink symbol includes the same A symbol of a beam quasi-alignment of a beam, and the average received signal strength indicator measurement is a beam-level received signal strength indicator associated with the beam of the plurality of beams. The wireless resource management and wireless link monitoring configuration and process method described in the first item of the patent application, wherein the received signal strength indicator measurement timing configuration includes at least one of the following: the received signal strength indicator measurement symbol timing sequence Offset, the received signal strength indicates a measurement duration of measurement, and the received signal strength indicates a period of measurement. The method for wireless resource management and wireless link monitoring configuration and progress as described in the first item of the patent application, further comprising: determining the start of a measurement interval associated with a transmission from the first cell; identifying includes a Synchronization signal block measurement timing configuration measurement window timing offset One of the synchronization signal block measurement timing configuration; the timing offset is refined by a measurement interval at the beginning of the measurement interval on a timing offset received from a second cell A sync signal block starts a sync signal block measurement, wherein the timing refinement offset of the measurement interval is less than 1 millisecond. According to the method of radio resource management and radio link monitoring configuration and process described in item 7 of the patent application, the first cell has a first frequency, and the second cell has a first frequency different from the first frequency. Two frequencies, the method further includes: completing the user equipment from the first frequency to the second frequency on the timing offset from the beginning of the measurement interval through the timing refinement offset of the measurement interval Tuning. A method for wireless resource management and wireless link monitoring configuration and progress, used for wireless communication with a user equipment to achieve a third layer mobility, the method includes: identifying a timing configuration of a channel status information reference signal ; Based on the timing configuration, perform a radio resource management measurement on the channel status information reference signal, where the timing configuration includes at least one of the following: indicating a position of one of the time or frequency resources of a channel status information reference signal in a time slot A resource allocation, a subframe offset, and a time slot offset relative to a transmission start of a sync signal burst. A method for wireless resource management and wireless link monitoring configuration and progress is used for wireless communication with a user equipment. The method includes: identifying a wireless link monitoring configuration; based on the wireless link monitoring configuration, making a reference The signal performs a plurality of wireless link monitoring measurements, wherein the wireless link monitoring configuration includes at least one of the following: indicating that the reference signal is associated with a control channel and a first parameter, indicating that the reference signal is synchronized with a A second parameter is associated with one of the indications of /out of synchronization.

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