Partial bandwidth configuration method for NR cell

Abstract

The invention discloses a partial bandwidth configuration method for an NR cell, and relates to the technical field of wireless communication. According to the method, three bandwidth parts are configured for an NR (New Radio) cell, wherein the three bandwidth parts are used for initially accessing a BWP0 and dedicated BWP1 and BWP2; controlling target user equipment to access the BWP0, acquiring a signal to noise ratio of the user equipment, and determining a cell edge state identifier of the user equipment by comparing the signal to noise ratio with a cell edge judgment threshold value of the user equipment; according to the cell edge state identifier, determining that the target activated bandwidth part is BWP2 or BWP1; and updating the bandwidth part of the user equipment according to the target activated bandwidth part. According to the invention, during NR co-frequency networking deployment, the PCI of the adjacent cells can be reasonably planned, so that the adjacent cells are configured with non-overlapping special frequency domain resources at the cell edge, the signal interference of the UE at the cell edge can be effectively reduced, the service quality of the cell edge is improved, and guarantee is provided for the service stability and reliable communication of the terminal equipment at the cell edge.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, and in particular relates to a partial bandwidth configuration method for an NR cell. BACKGROUND

[0002] The new generation mobile communication technology NR adopts a wider spectrum bandwidth, for example, supports a system bandwidth of up to 100MHz in the FR1 frequency band, which is 5 times the bandwidth of 20MHz of the long term evolution (LTE) technology. This change of ultra-wideband spectrum greatly improves the uplink and downlink throughput of the system, for example, in the time division duplex mode, the downlink single carrier peak rate is 1.5Gbps and the uplink peak rate is 600Mbps, thereby bringing an extreme high-speed mobile Internet experience to users. At the same time, the high bandwidth and low latency characteristics of the NR technology also make it surpass the traditional consumer field and begin to be widely used in the vertical industry such as industrial Internet of Things and intelligent manufacturing, which has strict requirements on communication performance, and through informatization empowerment, it improves the production and management efficiency. With the continuous deepening of the application scenarios of NR communication technology, the reliability of wireless communication connection in various industries has been put forward with unprecedentedly high requirements.

[0003] In the existing NR system, the network usually manages the radio frequency and baseband resources of the terminal by configuring a partial bandwidth for the terminal. A common configuration strategy is to statically or semi-statically configure a BWP for a user equipment (UE) covering all or most of the available spectrum of the cell. This method works well in the central area of the cell: the UE in this position is closer to the base station, and the path loss is smaller, so only a lower transmit power is needed to achieve reliable communication, and the same frequency interference caused by the UE in the adjacent cell is also relatively limited. However, when the UE moves to the edge of the cell, due to the distance between the terminal and the serving base station, the path loss increases significantly, and in order to maintain the basic communication connection quality, the UE at the edge of the cell often needs to transmit uplink with a transmit power close to its maximum capability. When such a UE is configured to use a full-bandwidth BWP, its high-power transmit signal will cause strong same-frequency interference to the edge UEs of the adjacent cell on the entire system bandwidth. This cross-cell interference between edge users can seriously degrade the received signal quality, not only significantly reducing the spectral efficiency and system throughput of the cell edge area, but also directly affecting the reliability of data transmission. SUMMARY

[0004] Therefore, it is necessary to provide a partial bandwidth configuration method for an NR cell in view of the above technical problems.

[0005] The present specification adopts the following technical solution: The present specification provides a partial bandwidth configuration method for an NR cell, comprising: Three working bandwidths are configured for the NR cell system: BWP0 for initial access, BWP1 for central user equipment of the NR cell system, and BWP2 for edge user equipment of the NR cell system; wherein the frequency domain resource location of the BWP2 is determined based on the NR physical cell identifier; controlling the user equipment to access the BWP0 and obtaining the signal-to-noise ratio of the user equipment; comparing the signal-to-noise ratio with a cell edge determination threshold value of the user equipment to determine whether the user equipment is a cell edge user equipment, and updating the cell edge state identifier of the target user equipment according to the determination result; determining the target active bandwidth part according to the cell edge state identifier of the user equipment; wherein when the cell edge state identifier indicates that the user equipment is a cell edge user, the target active bandwidth part is BWP2; when the cell edge state identifier indicates that the user equipment is a cell center user, the target active bandwidth part is BWP1; updating the bandwidth part of the user equipment based on the active bandwidth part of the user equipment and the target active bandwidth part.

[0006] Further, the frequency domain resource location of the BWP2 is determined, specifically including: dividing the working bandwidth of the NR cell into a plurality of same size frequency domain continuous PRB resource blocks to form a PRB set . based on the PRB set , selecting a PRB set with index k , and configuring the set as the NR cell dedicated BWP2 resource; The index k is determined based on the physical cell identifier of the NR cell, and the formula is: k=PCI mod K; wherein PCI is the physical cell identifier; K= , M is an integer greater than 1, and the total number of PRBs of the working bandwidth of the NR cell system.

[0007] Further, the signal-to-noise ratio SNR of the target user equipment is obtained, including: starting a measurement timer T; obtaining J uplink channel instantaneous measurement values within the running period of the measurement timer T, and each measurement value is denoted as ; based on the measurement value and the filter coefficient , the channel measurement result in the measurement timer T period is obtained through J times of iteration filtering calculation ; The calculation formula of the channel measurement result is as follows: .

[0008] Further, the cell edge state identification of the target user equipment includes: Cell center user identification: if the channel measurement result of the user equipment is greater than a preset threshold value , it is determined that the user equipment is in a cell center position, and the cell edge state identification iscelledgeUE is False; Cell edge user identification: if the channel measurement result of the user equipment is less than or equal to a preset threshold value , the user equipment is in a cell coverage edge, and the cell edge state identification iscelledgeUE is True.

[0009] Further, the update of the bandwidth part of the user equipment includes: When the target user equipment is a cell edge user, and the activated bandwidth part of the target user equipment is BWP2, the service is still performed using BWP2; When the target user equipment is a cell edge user, and the activated bandwidth part of the target user equipment is not BWP2, the bandwidth part is updated to BWP2; When the target user equipment is a cell center user, and the activated bandwidth part of the target user equipment is BWP1, the service is still performed using BWP1; When the target user equipment is a cell center user, and the activated bandwidth part of the target user equipment is not BWP1, the bandwidth part is updated to BWP1.

[0010] The above at least one technical solution adopted in the specification can achieve the following beneficial effects: In the part bandwidth configuration method for an NR cell provided in the specification, BWP resource configuration dedicated to a cell edge user is generated through a physical cell identifier of the NR cell. In the deployment of NR same-frequency networking, by reasonably planning the physical cell identifiers of adjacent cells, dedicated frequency domain resources that do not overlap each other are configured between the adjacent cells at the cell edge, which can effectively reduce the signal interference of user equipment at the cell edge, improve the service quality at the cell edge, and provide protection for the service stability and reliable communication of terminal equipment at the cell edge. At the same time, the terminal transmit power spectral density at the cell edge can also be improved, and the cell edge coverage capability can be enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0011] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0012] Figure 1 This is a schematic diagram of the BWP handover determination process based on uplink channel measurement provided in this manual; Figure 2 This document provides a schematic diagram of a BWP2 configuration process for a cell edge UE. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this specification clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this specification, all other implementations obtained by those skilled in the art without creative effort are based on this, and there is an urgent need for a novel decoupling method that works collaboratively at the hardware and algorithm levels, capable of achieving real-time independence and high-precision output of the sensing channel under low-frequency dynamic conditions.

[0014] This application provides a method for configuring a partial bandwidth (BWP) in an NR system, the specific steps of which are as follows: Assume the total number of PRBs in the NR cell system's operating bandwidth is The cell is configured with one initial access BWP0 and two dedicated BWP1 and BWP2. The resource locations of BWP0 and BWP1 are not restricted. BWP1 is mainly used by UEs (User Equipment) in the cell center, and BWP2 is used by UEs located at the cell edge. S101, Construct the PRB set .

[0015] The operating bandwidth of the NR system is divided into several sets of PRBs (Physical Resource Blocks) of equal size, and each set is then used... Identifiers, i = 0, 1, 2, ..., (K-1); each PRB set It contains frequency-domain contiguous PRB resource blocks, and If it contains M consecutive PRBs, then K = , where M is an integer greater than 1.

[0016] S102, Determine the resource location of the dedicated BWP2 at the edge of the NR cell.

[0017] The set generated from S101 Select a PRB set with index k from the set Configure the BWP2 resource as a cell-specific BWP2 resource with index Where PCI (physical cell identity) is the physical cell identity of the NR cell.

[0018] S103, assuming that the UE is located at the edge of the cell when initially accessing the cell and that the UE initially accesses BWP0 and then switches to the target BWP2.

[0019] S104, based on the sounding reference signal (SRS) or physical uplink shared channel (PUSCH) measurement signal-to-noise ratio (SNR), obtain the uplink channel measurement information of the UE.

[0020] The maintenance criteria for the measurement value are as follows: 1) The initial value of the measurement SNR report is denoted as .

[0021] 2) Start the measurement timer T-measure (configure the timeout T to be greater than 0, in ms), assuming that there are J measurement values within the timer T-measure, j = 0, 1, 2,..., J-1; each measurement value is recorded as , and the filter coefficient is (the value is greater than 0 and less than 1, and is configured according to actual requirements), and the measurement value reported within the measurement period T-measure is .

[0022] The measurement value is calculated as follows: Update according to the measurement value, when j = 0, (j-1) = 0. After J calculations, the channel measurement result calculation value within the period T is obtained .

[0023] 3) After the measurement timer T-measure times out, report the measurement value; and reset the timer to re-execute the SNR measurement and calculation of the reported value.

[0024] S105, obtain the SNR calculation result of the UE and the set cell edge determination threshold value Comparing, using the state variable iscelledgeUE to identify whether the UE is a cell edge UE; wherein the state variable iscelledgeUE is preset with an initial value True.

[0025] If the UE uplink channel or uplink signal measurement calculation result is less than or equal to a preset threshold value , it is determined that the UE is at the edge of cell coverage, and iscelledgeUE is True, keeping the initial value unchanged. If the UE uplink channel or uplink signal measurement calculation result is greater than a preset threshold value , it is determined that the UE is a non-cell edge UE, and iscelledgeUE is updated to False.

[0026] S106, updating the target BWP according to the value of the state variable iscelledgeUE.

[0027] 1) The state variable iscelledgeUE of the UE is True, it is determined that the UE is at the edge of cell coverage, and the target BWP is activated to BWP2.

[0028] If the activated BWP of the UE is BWP2, no BWP switching is performed, and BWP2 is still used for service; If the activated BWP of the UE is not BWP2, BWP switching is performed, and the target BWP2 is set as the activated BWP.

[0029] 2) The state variable iscelledgeUE of the UE is False, it is determined that the UE is a non-cell edge UE, and the target BWP is activated to BWP1.

[0030] If the activated BWP of the UE is BWP1, no BWP switching is performed, and BWP1 is still used for service; If the activated BWP of the UE is not BWP1, BWP switching is performed, and the target BWP1 is set as the activated BWP.

[0031] S107, repeating S104-S106 until the UE service ends and enters the RRC (Radio Resource Control) idle state.

[0032] The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0033] Figure 1 The present application is a flowchart for determining BWP switching based on uplink channel measurement, which specifically includes the following steps: Assuming a cell bandwidth of 100MHz, a subcarrier spacing of 30KHz, BWP0 of 20MHz, BWP1 configured with full bandwidth and 273PRB; BWP2 of 20M bandwidth and 51PRB, and a cell PCI of 103.

[0034] The first step is to divide the operating bandwidth of the NR system into several PRB sets of equal size, and then use... Identifiers, i = 0, 1, 2, ..., (K-1); each PBR set It contains frequency-domain contiguous PRB resource blocks, and If it contains M consecutive PRBs, then K = If M is an integer greater than 1, then K = 5.

[0035] The second step is to determine the resource location of BWP2 in NR cell, such as... Figure 2 As shown, the set generated in the first step Select a PRB set with index k. Configured as dedicated BWP2 resource for this cell, with index k=103mod5=3, then the starting PRB corresponding to BWP2 is (k-1)*51=102. Therefore, the BWP2 resource location for this cell is a frequency domain resource with a starting RB=102 and 51 consecutive PRBs.

[0036] The third step is for the UE to initially access BWP0 and then switch to the target BWP2 (assuming the UE is located at the cell edge when it initially accesses the cell).

[0037] The fourth step is to obtain the uplink channel measurement information for the UE, which can be based on SRS or PUSCH to measure SNR. The measurement value maintenance criteria are as follows:

[0038] 4.1 The initial value for reporting the measured SNR is denoted as... ; 4.2 Start the measurement timer T-measure. Assume there are J measurement values ​​within timer T-measure, j=0,1,2,...J-1; each measurement value is recorded as follows: The filter coefficients are (This value is greater than 0 and less than 1, configured according to actual needs), then the measurement value reported within the measurement period T is ; The measured values ​​were obtained by the following method: 4.2.1 Update based on measured values When j=0, (j-1) = 0; 4.2.2 After J calculations, the calculated channel measurement results within period T are obtained. ; 4.3 After the measurement timer T-measure expires, the measurement value is reported and the timer is reset to re-perform SNR measurement and value reporting; Step 5, using the SNR calculation result of the UE and the set cell edge determination threshold value to compare and determine whether the UE is a cell edge UE; a state variable iscelledgeUE is used to identify, with a preset initial value True.

[0039] 5.1 If the uplink channel or uplink signal measurement calculation result of the UE is less than or equal to the preset threshold value , it is determined that the UE is at the edge of the cell coverage, and iscelledgeUE is True, keeping the initial value unchanged; 5.2 If the uplink channel or uplink signal measurement calculation result of the UE is greater than the preset threshold value , it is determined that the UE is a non-cell edge UE, and iscelledgeUE is updated to False; Step 6, according to the value of the state variable iscelledgeUE, the target BWP is updated.

[0040] 6.1 If the state variable iscelledgeUE of the UE is True, it is determined that the UE is at the edge of the cell coverage, and the target BWP is activated as BWP2; 6.1.1 If the activated BWP of the UE is BWP2, no BWP switching is performed, and BWP2 is still used for service; 6.1.2 If the activated BWP of the UE is not BWP2, BWP switching is performed, and the target BWP2 is set as the activated BWP; 6.2 If the state variable iscelledgeUE of the UE is False, it is determined that the UE is a non-cell edge UE, and the target BWP is activated as BWP1; 6.2.1 If the activated BWP of the UE is BWP1, no BWP switching is performed, and BWP1 is still used for service; 6.2.2 If the activated BWP of the UE is not BWP1, BWP switching is performed, and the target BWP1 is set as the activated BWP; Step 7, steps 4-6 are repeatedly performed until the UE service ends and enters the RRC idle state.

[0041] The application provides a bandwidth configuration method for NR cell edge, generates BWP resource configuration special for cell edge through cell PCI, reasonably plans PCI of adjacent cells when deploying in the same frequency of NR, and makes the special frequency domain resources of adjacent cells not overlap each other at the cell edge, which can effectively reduce signal interference of the UE at the cell edge, improve transmission efficiency at the cell edge, reduce interference between users at the cell edge of adjacent cells, and improve transmission performance and reliability of the NR system at the cell edge.

[0042] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

Claims

1. A method for configuring partial bandwidth in an NR cell, characterized in that, include: Three working bandwidths are configured for the NR cell system: BWP0 for initial access, BWP1 for use by the central user equipment of the NR cell system, and BWP2 for use by the edge user equipment of the NR cell system; wherein, the frequency domain resource location of BWP2 is determined based on the NR physical cell identifier; Control the user equipment to access BWP0 and obtain the signal-to-noise ratio of the user equipment; The signal-to-noise ratio is compared with the cell edge determination threshold of the user equipment to determine whether the user equipment is a cell edge user equipment, and the cell edge status identifier of the target user equipment is updated according to the determination result. The target active bandwidth portion is determined based on the cell edge status identifier of the user equipment; wherein, when the cell edge status identifier indicates that the user equipment is a cell edge user, the target active bandwidth portion is BWP2; when the cell edge status identifier indicates that the user equipment is a cell center user, the target active bandwidth portion is BWP1. Update the bandwidth portion of the user equipment based on the active bandwidth portion of the user equipment and the target active bandwidth portion.

2. The method for partial bandwidth configuration in an NR cell as described in claim 1, characterized in that, The determination of the frequency domain resource location of BWP2 specifically includes: The working bandwidth of an NR cell is divided into multiple frequency-domain contiguous PRB resource blocks of the same size, forming a PRB set. ; Based on the PRB set Select a PRB set with index k. and the set Configured as dedicated BWP2 resources for the NR cell; The index k is determined based on the physical cell identifier of the NR cell, using the following formula: k = PCI mod K; Where PCI stands for Physical Cell Identifier; K= M is an integer greater than 1. This represents the total number of PRBs (Persistent Bandwidth Counts) for the NR cell system's operating bandwidth.

3. The method for partial bandwidth configuration in an NR cell as described in claim 1, characterized in that, The acquisition of the signal-to-noise ratio (SNR) of the target user equipment includes: Start the measurement timer T; During the operating cycle of the measurement timer T, J instantaneous uplink channel measurements are acquired, and each measurement value is denoted as... ; Based on the measured values and filter coefficients The channel measurement results within the measurement timer T period are obtained through J iterations of filtering calculation. ; The channel measurement results The calculation formula is: 。 4. The method for partial bandwidth configuration in an NR cell as described in claim 1, characterized in that, The cell edge status identifier of the target user equipment includes: Cell center user identifier: If the channel measurement results of the user equipment Greater than the preset threshold value If the user equipment is located in the center of the cell, the cell edge status identifier iscelledgeUE is set to False. Cell edge user identifier: If the channel measurement results of the user equipment Less than or equal to the preset threshold value If the user equipment is at the cell coverage edge, the cell edge status identifier iscelledgeUE is True.

5. A partial bandwidth configuration method for NR cells as described in claim 1, characterized in that, The update of the bandwidth portion of the user equipment includes: When the target user equipment is a cell edge user and the bandwidth portion that the target user equipment has activated is BWP2, then BWP2 will still be used for services. When the target user equipment is a cell edge user and the bandwidth portion that the target user equipment has activated is not BWP2, then the updated bandwidth portion is BWP2. When the target user equipment is a cell center user and the bandwidth portion that the target user equipment has activated is BWP1, then BWP1 will still be used for services. If the target user equipment is a cell center user and the bandwidth portion already activated by the target user equipment is not BWP1, then the updated bandwidth portion is BWP1.

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