Method, device, equipment and storage medium for adjusting cell bandwidth switching strategy

Abstract

The present invention discloses a method, apparatus, device and storage medium for adjusting the bandwidth switching strategy of a cell. The method judges the uplink coverage performance of the location of a terminal in the cell according to the total number of successful uplink DC I allocations of PDCCH at different aggregation levels, calculates the ratio of the target number of successful uplink DC I allocations of PDCCH at a larger aggregation level to the total number of successful allocations. When the ratio exceeds a ratio threshold, it is determined that some users in the current cell are residing in a scenario with limited uplink coverage, and it is necessary to modify the BWP switching strategy of the current cell, reduce the time slot threshold for switching the cell from BWP2 to BWP1, so that the terminal in the current cell can more easily trigger the switching from BWP2 to BWP1, solves the problem of directly shutting down the BWP function of the cell when the uplink coverage of the NR TDD network is limited, does not cause the terminal to use the full bandwidth of the cell for each service, reduces terminal power consumption, and does not cause waste of 5G air interface resources.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular to a method, device, equipment and storage medium for adjusting a cell's bandwidth switching strategy. Background Art

[0002] In the downlink of the 5G network NR TDD (New Radio Time Division Duplexing) standard, the base station compensates for downlink propagation loss by increasing transmit power and configuring multi-port antennas to improve downlink coverage performance. However, in the uplink, the transmit power of the UE (User Equipment) and the antenna port configuration of the terminal are significantly different from those on the base station side. NR TDD uses a large bandwidth such as 100MHz as a frequency point (400MHz is used in the millimeter wave band). From the perspective of business requirements, the terminal side does not always require large bandwidth transmission. To improve the battery life of the terminal, the 5G new air interface NR defines a partial bandwidth (BWP) to allow the terminal to operate on a portion of the total bandwidth of the NR cell. Different BWP bandwidths, such as BWP0, BWP1, and BWP2, can be used to meet different business requirements.

[0003] Link budget results show that NR TDD networks inevitably have areas where uplink coverage performance is inferior to downlink coverage. If a user is located in an NR TDD cell with limited uplink coverage, the terminal's uplink transmission rate is low and cannot reach the handover threshold from BWP2 to BWP1. This prevents the user from switching from BWP2 to BWP1 in a timely manner, resulting in a persistently low transmission rate and severely impacting user experience. The current standard solution to this problem is to disable the BWP function for the NR TDD cell. However, directly disabling the BWP function for the NR TDD cell is equivalent to disabling the terminal's energy-saving function for that cell. All 5G users in that cell cannot use the BWP function, and each service will use the full bandwidth of the 5G cell, reducing the battery life of 5G terminals. Furthermore, the area with limited uplink coverage in the NR TDD cell is only a small part of the cell, and the 5G users in the weak uplink coverage area are also only a small part of the 5G cell. Therefore, disabling the BWP function for the entire 5G cell forces all services to use the full bandwidth, resulting in a waste of 5G air interface resources. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a method, apparatus, device and storage medium for adjusting the bandwidth switching strategy of a cell. By modifying the bandwidth switching strategy of a cell with limited uplink coverage, the problem of directly shutting down the BWP function of the NR TDD cell when the uplink coverage of the NR TDD network is limited is solved. This does not cause the terminal to use the full bandwidth of the 5G cell for each service, reduces terminal power consumption, and does not cause waste of 5G air interface resources.

[0005] To achieve the above objectives, an embodiment of the present invention provides a method for adjusting a cell's bandwidth switching strategy, comprising:

[0006] Obtaining the number of successful uplink resource allocations to the terminal by the current cell at different aggregation levels within the current detection period; wherein the uplink resources are allocated by the physical downlink control channel of the current cell through downlink control information;

[0007] Calculate the ratio of the target number of successful allocations of uplink resources to the total number of successful allocations at the target aggregation level;

[0008] When the number ratio is greater than a ratio threshold, a time slot threshold for switching the current cell from a first bandwidth to a second bandwidth is reduced; wherein the first bandwidth is smaller than the second bandwidth.

[0009] As an improvement to the above solution, when the number ratio is greater than a set ratio threshold, the method further includes:

[0010] The throughput threshold value for switching the current cell from the first bandwidth to the second bandwidth remains unchanged.

[0011] As an improvement to the above solution, after lowering the timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth, the method further includes:

[0012] After entering a new detection cycle, when it is detected that the number ratio is less than or equal to the ratio threshold, the time slot threshold for switching the current cell from the first bandwidth to the second bandwidth is restored to the initial time slot threshold.

[0013] As an improvement to the above solution, after lowering the timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth, the method further includes:

[0014] Respectively obtaining reference parameters of the current cell before and after adjusting the handover strategy;

[0015] When the adjusted reference parameter and the reference parameter before adjustment meet a preset bandwidth improvement condition, maintaining the timeslot threshold value for switching the current cell from the first bandwidth to the second bandwidth unchanged;

[0016] When the adjusted reference parameter and the reference parameter before adjustment do not meet the preset bandwidth improvement condition, the timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth continues to be reduced.

[0017] As an improvement of the above solution, the reference parameter is the uplink packet loss rate; then, the bandwidth improvement condition is that the adjusted uplink packet loss rate is less than the uplink packet loss rate before adjustment.

[0018] As an improvement to the above solution, the reference parameter is the proportion of the total effective time of the second bandwidth; then, the bandwidth improvement condition is that the proportion of the total effective time after adjustment is less than the proportion of the total effective time before adjustment.

[0019] As an improvement to the above solution, the proportion of the total effective duration is obtained by calculating the ratio of the fixed online duration of the second bandwidth to the total online duration of users based on the radio resource control protocol.

[0020] To achieve the above-mentioned purpose, an embodiment of the present invention further provides a device for adjusting a cell bandwidth switching strategy, comprising:

[0021] A data acquisition module, configured to acquire, within a current detection period, the number of successful allocations of uplink resources by the current cell to the terminal at different aggregation levels; wherein the uplink resources are allocated by the physical downlink control channel of the current cell through downlink control information;

[0022] a data calculation module, configured to calculate a ratio of a target number of successful allocations of uplink resources to a terminal at a target aggregation level to a total number of successful allocations;

[0023] The bandwidth switching strategy adjustment module is configured to reduce a time slot threshold for switching the current cell from a first bandwidth to a second bandwidth when the number ratio is greater than or equal to a ratio threshold; wherein the first bandwidth is smaller than the second bandwidth.

[0024] To achieve the above-mentioned objectives, an embodiment of the present invention further provides a cell bandwidth switching strategy adjustment device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the cell bandwidth switching strategy adjustment method as described in any of the above-mentioned embodiments is implemented.

[0025] To achieve the above-mentioned purpose, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the bandwidth switching strategy adjustment method for the cell as described in any of the above embodiments.

[0026] Compared with the prior art, the cell bandwidth switching strategy adjustment method, apparatus, device and storage medium disclosed in the present invention judge the uplink coverage performance of the location of the terminal in the cell according to the number of successful PDCCH uplink DCI allocations at different aggregation levels, and calculate the ratio of the target number of successful PDCCH uplink DCI allocations at a larger aggregation level to the total number of successful allocations. When this allocation number ratio exceeds the ratio threshold, it is determined that some users in the current cell are residing in a scenario with limited uplink coverage, and the BWP switching strategy of the current cell needs to be modified. At this time, the time slot threshold for switching the current cell from BWP2 to BWP1 is lowered, so that the terminal in the current cell can more easily trigger switching from BWP2 to BWP1. By modifying the bandwidth switching strategy of a cell with limited uplink coverage, terminals at the coverage edge of the cell can quickly switch from narrow bandwidth to full bandwidth when they need to transmit or receive large data packets, thereby improving the transmission performance of the terminal. In addition, this solves the problem of directly shutting down the BWP function of the NR TDD cell when the uplink coverage of the NR TDD network is limited in the prior art, and prevents the terminal from using the full bandwidth of the 5G cell for each service, thereby reducing terminal power consumption and preventing waste of 5G air interface resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of a method for adjusting a cell's bandwidth switching strategy provided by an embodiment of the present invention;

[0028] Figure 2 This is a structural block diagram of a cell bandwidth switching strategy adjustment device provided by an embodiment of the present invention;

[0029] Figure 3 This is a structural block diagram of a cell bandwidth switching strategy adjustment device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] BWP is a new concept introduced in the NR standard. By allocating a continuous bandwidth resource to the UE on the network side, it enables flexible transmission bandwidth configuration on both the network and UE sides. BWP is equivalent to dividing the 5G spectrum into many small blocks within a certain period of time. Each BWP can use a different parameter set with different bandwidth, subcarrier spacing, and other control parameters. This is equivalent to dividing the 5G cell into several sub-cells with different configurations to accommodate different types of terminals and services.

[0032] The UE configures a BWP in the RRC (Radio Resource Control) connected state. The protocol stipulates that a UE can be configured with up to four dedicated BWPs. Currently, a UE can be configured with two uplink dedicated BWPs (Dedicated UL BWP) and two downlink dedicated BWPs (Dedicated DL BWP) through RRC signaling. Of the two dedicated BWPs, one is a full-bandwidth BWP1 and the other is a narrow-bandwidth BWP2 (also known as a power-saving BWP). Dedicated ULBWP and Dedicated DL BWP must be configured separately. BWPs are used in pairs, meaning that the UE can use either full-bandwidth BWP1 or narrow-bandwidth BWP2 for both uplink and downlink traffic. BWP switching refers to the behavior of the UE in the RRC connected state. The UE switches between the two configured Dedicated BWPs, that is, between the full bandwidth BWP1 and the narrow bandwidth BWP2. At a certain moment, the UE can only activate one configured DedicatedBWP. Currently, the UE is instructed to switch between the two Dedicated BWPs through DCI. The DCI indication DCI 0_1 (uplink) or DCI1_1 (downlink) contains the field "Bandwidth part indicator" to instruct the UE to switch between BWP1 and BWP2.

[0033] See also Figure 1 , Figure 1 1 is a flow chart of a method for adjusting a bandwidth switching strategy of a cell provided by an embodiment of the present invention, wherein the method for adjusting a bandwidth switching strategy of a cell includes:

[0034] S1. Obtain the number of successful uplink resource allocations to the terminal by the current cell at different aggregation levels within the current detection period;

[0035] S2. Calculate the ratio of the target number of successful uplink resource allocations to the terminal at the target aggregation level to the total number of successful allocations.

[0036] S3. When the number ratio is greater than the ratio threshold, lower the time slot threshold for switching the current cell from the first bandwidth to the second bandwidth.

[0037] Specifically, in step S1, the number of successful allocations of uplink DCI (Downlink Control Information) of PDCCH (Physical Downlink Control Channel) at different aggregation levels is collected, and the collection is divided into time periods according to the detection period. For example, if the detection period is 60 minutes, data is collected every 60 minutes. The detection period can also be 30 minutes, 15 minutes, 5 minutes, 1 minute, etc., which are not specifically limited here. It is worth noting that the dynamic adjustment of the BWP switching strategy of the NR cell can be accelerated by reducing the statistics of the detection period (such as reducing the detection period from 60 minutes to 30 minutes), timely discovering the location and wireless quality of the UE in the NR cell, and modifying the BWP switching strategy so that the UE with a far location or poor wireless quality in the NR cell can switch the 5G terminal from the first bandwidth to the second bandwidth as soon as possible to ensure the wireless transmission performance of the UE.

[0038] It is worth noting that in LTE, PDCCH DCI can be divided into Common DCI and UE-specific DCI. Common DCI represents RAR, SIB / SI and paging scheduling information, which are common to all UEs in the cell. UE-specific DCI indicates the downlink or uplink scheduling information of each UE. Regarding DCI content, two types of DCI transmissions can be considered in the embodiments of the present invention: single DCI transmission and multi-level / component DCI transmission. For multi-level / component DCI, we can start by considering the two-level case. For two-level DCI transmission, the second-level DCI has two possible multiplexing areas: 1) Located in the predefined time and frequency position in the PDSCH part. 2) Located in the PDCCH area, but the first-level DCI candidates thereafter are different.

[0039] For example, a two-level DCI design offers the following advantages: 1) Flexible resource sharing between PDCCH and PDSCH. First-level DCI can be a semi-statically configured area used to transmit basic control information, while second-level DCI can dynamically indicate flexible sharing of time and frequency resources with PDSCH. Second-level DCI positioning can be quickly acquired without blind detection. 2) Energy saving. Avoiding UE blind detection in a larger search space saves UE power consumption. In two-level DCI, dividing DCI into first-level and second-level DCI allows UE detection to be stopped earlier, and eliminating blind detection in the second level also saves power. 3) Reduced signaling overhead. DCI content can generally be divided into slow and fast information based on the attributes of each information type. Considering multi-slot scheduling, multi-slot carrier indication, and time domain resource indication are slow information, while MCS, RI, RV, and HARQ process ID indication are fast information. Slow information does not necessarily need to be sent in every scheduling slot. 4) Reduced latency through independent encoding and decoding. It is necessary to distinguish between processing delay-sensitive DCI and delay-insensitive DCI. Due to its smaller payload, delay-sensitive DCI can be detected more quickly.

[0040] For example, the NR system defines that the PDCCH can use 1, 2, 4, 8, or 16 consecutive CCEs (Control Channel Elements). The number of CCEs used is also called the aggregation level. The larger the DCI payload, the higher the corresponding PDCCH aggregation level (number of CCEs). When the wireless channel quality is poor, to ensure PDCCH transmission quality, the required PDCCH aggregation level will also be higher. The more CCEs the PDCCH uses, the higher the aggregation level, the better the demodulation performance. NR TDD cells determine the aggregation level to use for a particular PDCCH based on factors such as channel quality. For example, for UEs at the cell edge (with poor communication quality), a PDCCH format with a higher CCE aggregation level should be used to trade resources for demodulation performance; for UEs at the cell center (with better communication quality), a PDCCH format with a lower CCE aggregation level can be used to save time-frequency resources. The number of successful uplink resource allocations to terminals by the current cell at different aggregation levels during the current detection period is obtained. The obtained data is shown in Table 1.

[0041] Table 1 Number of successful PDCCH uplink DCI allocations for NR cells at different aggregation levels

[0042]

[0043] Specifically, in step S2, DCI is downlink control information carried by the downlink physical control channel (PDCCH) and sent by the eNB to the UE. It includes uplink and downlink resource allocation, HARQ information, power control, and more. DCI transmission is used to generate and send DCI information to the terminal to complete PUSCH allocation. DCI primarily includes terminal identity information, transport block information, and HARQ (Hybrid Automatic Repeat Request) information. Because PDCCH downlink DCI allocation carries system information, a higher PDCCH aggregation level is used to ensure transmission quality. The PDCCH uplink DCI aggregation level does not require the transmission of system information; instead, it is determined based on the UE's current radio quality. Therefore, the number of successful PDCCH uplink DCI allocations at different aggregation levels can represent the radio channel quality at the UE's location. For UEs at the cell edge or with poor radio channel quality, a higher PDCCH aggregation level is required to ensure PDCCH transmission quality. Therefore, for cell-edge UEs, a PDCCH format with a higher CCE aggregation level should be used to trade resources for demodulation performance. On the contrary, a PDCCH format with a smaller CCE aggregation level can be used for the UE in the cell center to save time and frequency resources.

[0044] Exemplarily, the target aggregation level is the top n aggregation levels ranked largest among several different aggregation levels; where 1≤n≤3. For example, when n=2, the target number of successful PDCCH uplink DCI assignments at aggregation level 8 and aggregation level 16 is selected and filtered, and the ratio of the target number of successful PDCCH uplink DCI assignments at aggregation level 8 and aggregation level 16 to the total number of successful PDCCH uplink DCI assignments is calculated, as shown in Table 2.

[0045] Table 2 Percentage of successful PDCCH uplink DCI allocations at aggregation levels 8 and 16

[0046] NR cell gNodeB name The proportion of successful times at aggregation levels 8 and 16 3 A2_YZlac(NSA)HRD_H 12.6％ 2 A2_YZlac(NSA)HRD_H 8.8％ 1 A2_YZlac(NSA)HRD_H 12.4％ 3 A2_XH(NSA)HRD_H 8.2％ 2 A2_XH(NSA)HRD_H 2.3％ 1 A2_XH(NSA)HRD_H 10.7％

[0047] Specifically, in step S3, when the number ratio is greater than the ratio threshold value T0, assuming T0 is 10%, it is determined that there are users with far locations or poor wireless quality in the current NR cell, and the BWP switching strategy of the current cell needs to be modified.

[0048] For example, in the embodiment of the present invention, the activation status of the BWP function of the NR TDD cell and the configuration of the BWP switching parameters are pre-collected. The current default settings for the BWP resource configuration of the NR TDD cell are: BWP0: 48RB, BWP1: 273RB, BWP2: 51RB; wherein RB (Resource Block) represents the resource block occupied by the BWP. BWP0 is the bandwidth used by all users when establishing RRC; BWP1 is the initial BWP. When the UE just establishes RRC, the full bandwidth will be occupied, which is the second bandwidth described in the embodiment of the present invention; BWP2 is the bandwidth used by the terminal in the service data transmission stage according to the service rate requirements. If it is a small packet service, the bandwidth occupied by this terminal will be switched to BWP2, which is the first bandwidth described in the embodiment of the present invention. For example, the bandwidth of the second bandwidth BWP1 is 40MHz, and the bandwidth of the first bandwidth BWP2 is 10MHz.

[0049] Specifically, the BWP switching parameter configuration of the terminal includes the throughput threshold for switching from BWP1 to BWP2 and the time slot threshold for switching from BWP2 to BWP1; wherein, the throughput threshold includes the uplink throughput threshold and the downlink throughput threshold, and the time slot threshold includes the uplink time slot threshold and the downlink time slot threshold.

[0050] For example, the default BWP handover parameter configuration of the current cell is as follows:

[0051] 1) Downlink throughput threshold when BWP1 switches to BWP2: 1000 kbps. When the user's downlink RLC throughput is less than this threshold, the terminal is triggered to switch from BWP1 to BWP2. The larger the threshold value, the easier it is for the terminal to switch from BWP1 to BWP2, the lower the terminal's downlink rate, but the better the terminal's energy saving effect.

[0052] 2) Uplink throughput threshold when BWP1 switches to BWP2: 250 kbps. When the user's uplink RLC throughput is less than this threshold, the terminal is triggered to switch from BWP1 to BWP2. The larger the threshold value, the easier it is for the terminal to switch from BWP1 to BWP2, the lower the terminal's downlink rate, but the better the terminal's energy saving effect.

[0053] 3) Downlink slot (time slot) threshold for switching from BWP2 to BWP1: 16 slots. When the amount of downlink RLC cache data of the user is greater than or equal to the downlink traffic threshold for switching from BWP2 to BWP1, the user switches from BWP2 to BWP1. The smaller the threshold value is configured, the lower the downlink traffic threshold for switching from BWP2 to BWP1, the easier it is to trigger switching from BWP2 to BWP1, and the user data throughput rate increases, but the terminal power consumption increases.

[0054] 4) Slot (time slot) threshold for switching from BWP2 to BWP1: 4 slots; when the amount of data sent uplink by the user is greater than or equal to the uplink traffic threshold for switching from BWP2 to BWP1, the user switches from BWP2 to BWP1. The smaller the threshold value is configured, the lower the downlink traffic threshold for switching from BWP2 to BWP1, the easier it is to trigger the switching from BWP2 to BWP1, the higher the user data throughput, but the terminal power consumption increases.

[0055] Specifically, by screening NR cells with a larger aggregation level and whose ratio of the target number of successful PDCCH uplink DCI allocations to the total number of successful attempts exceeds the ratio threshold, it is determined that some users of the cell are residing in an uplink coverage-restricted scenario. At this time, it is necessary to trigger the terminal with uplink coverage restriction to switch from BWP2 to BWP1 as soon as possible, which is achieved by lowering the time slot threshold value for switching the current cell from the first bandwidth BWP2 to the second bandwidth BWP1 (simultaneously lowering the downlink time slot threshold value and the uplink time slot threshold value, or lowering one of the downlink time slot threshold value and the uplink time slot threshold value). At this time, it is also necessary to keep the throughput threshold value for switching the current cell from the first bandwidth BWP2 to the second bandwidth BWP1 unchanged.

[0056] For example, when it is determined that some users in the current cell reside in a scenario with limited uplink coverage, the BWP switching strategy of the current cell is adjusted as follows:

[0057] 1) Downlink throughput threshold when BWP1 switches to BWP2. The default value is 1000kbps and remains unchanged.

[0058] 2) Uplink throughput threshold when BWP1 switches to BWP2, default value: 250kbps, remains unchanged;

[0059] 3) The downlink slot (time slot) threshold for switching from BWP2 to BWP1 is gradually reduced from the default value of 16 slots, and the step size can be set to 4 slots, that is, the downlink slot (time slot) threshold for switching from BWP2 to BWP1 is reduced to 12 slots;

[0060] 4) The uplink slot (time slot) threshold value for switching from BWP2 to BWP1 is gradually reduced from the default value of 4 slots, and the step size can be set to 1 slot, that is, the uplink slot (time slot) threshold value for switching from BWP2 to BWP1 is reduced to 3 slots.

[0061] In an embodiment of the present invention, by modifying the bandwidth switching strategy of a cell with limited uplink coverage, a terminal at the coverage edge of the cell can quickly switch from narrow bandwidth to full bandwidth when it needs to transmit or receive large data packets, thereby improving the transmission performance of the terminal. This solves the problem in the prior art of directly shutting down the BWP function of the NR TDD cell when the uplink coverage of the NR TDD network is limited, and does not cause the terminal to use the full bandwidth of the 5G cell for each service, thereby reducing terminal power consumption and not causing waste of 5G air interface resources.

[0062] Furthermore, after lowering the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth, the method also includes: after entering a new detection cycle, when it is detected that the number ratio is less than or equal to the ratio threshold value, restoring the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth to the initial time slot threshold value.

[0063] For example, if it is found that the NR cell whose BWP switching strategy has been modified (specifically, the time slot threshold is lowered), the ratio of the target number of successful PDCCH uplink DCI allocations with a larger aggregation level to the total number of successful allocations is less than or equal to the ratio threshold T0, that is, the number of users with limited uplink coverage in the NR TDD cell has decreased, indicating that after the time slot threshold for switching from the first bandwidth to the second bandwidth was lowered in the previous detection cycle, the uplink coverage limitation scenario of the cell has been significantly improved. The previously modified BWP switching strategy is then rolled back to the initial state to minimize UE power consumption while ensuring user performance, and then enter the detection cycle of steps S1 to S3 to continue subsequent detection. For example, the downlink slot (time slot) threshold for switching from BWP2 to BWP1 is adjusted from 12 slots to the default value of 16 slots, and / or the uplink slot (time slot) threshold for switching from BWP2 to BWP1 is adjusted from 3 slots to the default value of 4 slots.

[0064] Furthermore, the method also includes: when the number ratio is less than or equal to the ratio threshold value, determining whether the current detection cycle is an initial detection cycle; when the current detection cycle is an initial detection cycle, keeping the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth unchanged; when the current detection cycle is not an initial detection cycle, restoring the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth to the initial time slot threshold value.

[0065] Exemplarily, the initial detection cycle is the first detection cycle that the current cell experiences after restoring the initial BWP switching policy parameters. At this time, the parameters in the BWP switching policy (uplink throughput, downlink throughput, uplink time slot threshold, downlink time slot threshold) are all default values. When this detection cycle is the initial detection cycle, when the ratio of the target number of successful uplink DCI allocations at a larger aggregation level to the total number of successful allocations does not exceed the ratio threshold, it is determined that only a small number of users in the cell reside in the uplink coverage-limited scenario. At this time, the bandwidth switching policy of the current cell can be kept unchanged, that is, the time slot threshold for switching the current cell from the first bandwidth to the second bandwidth remains unchanged (since the time slot threshold is at the default value at this time, there is no need to increase the value), and the throughput threshold for switching the current cell from the first bandwidth to the second bandwidth remains unchanged. When this detection cycle is not the initial detection cycle and the timeslot threshold has been lowered in the previous detection cycle, when the ratio of the target number of successful uplink DCI allocations of the PDCCH with a larger aggregation level to the total number of successful allocations does not exceed the ratio threshold, that is, the number of users with limited uplink coverage in the NR TDD cell decreases, the previously modified BWP switching strategy is rolled back to the initial state to ensure user performance while minimizing UE power consumption.

[0066] Furthermore, after lowering the timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth, the method further includes:

[0067] S4. Obtain reference parameters of the current cell before and after adjusting the handover strategy;

[0068] S5. When the adjusted reference parameter and the reference parameter before adjustment meet a preset bandwidth improvement condition, keep the timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth unchanged;

[0069] S6. When the adjusted reference parameter and the reference parameter before adjustment do not meet the preset bandwidth improvement condition, continue to reduce the timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth.

[0070] Specifically, after adjusting the timeslot threshold value once (before entering the next detection cycle), the reference parameter is used to evaluate the performance of the UE after the NR cell modifies the BWP switching strategy, and the reference parameter is the uplink packet loss rate or the proportion of the total effective duration of the second bandwidth. When the reference parameter is the uplink packet loss rate, the bandwidth improvement condition is that the adjusted uplink packet loss rate is less than the uplink packet loss rate before adjustment. When the reference parameter is the proportion of the total effective duration of the second bandwidth, the bandwidth improvement condition is that the adjusted total effective duration is less than the proportion of the total effective duration before adjustment.

[0071] Specifically, when the reference parameter is the uplink packet loss rate, the uplink packet loss rate can be collected in different time periods, such as a collection period of 60 minutes, 15 minutes, 5 minutes, 1 minute, etc. For uplink packet loss rate statistics, the base station side only needs to count the SN (Serial Number) of the PDCP (Packet Data Convergence Protocol) packets sent by the UE side. If there are discontinuous PDCP packets, it means that there is packet loss, and the uplink packet loss rate is directly counted through the PDCP layer packet loss statistics. If the terminal sends 5 packets with PDCP SNs of 1-5, and the base station side receives 4 packets of 1 / 2 / 3 / 5, the uplink packet loss rate counted by the base station side is 20%. For an example of the uplink packet loss rate of the NR cell, please refer to Table 3. In NR, 5QI is the QoS identifier used by different services. In Table 1, 5QI=1 indicates conversational voice services, namely VoNR services, 5QI=2 indicates conversational video services, 5QI=5 indicates the signaling of VoNR services, and 5QI=6 / 8 / 9 all refer to video services.

[0072] Table 3 NR cell uplink packet loss rate

[0073]

[0074] For example, in an embodiment of the present invention, it is only necessary to calculate the cell PDCP uplink packet loss rate of the current cell before and after adjusting the switching strategy. If there are users with far away locations or poor wireless quality in the NR cell, after modifying the switching strategy from BWP2 to BWP1, BWP2 is more easily triggered to BWP1, which can improve the uplink packet loss rate of the NR cell to a certain extent. Therefore, when the adjusted uplink packet loss rate is less than the uplink packet loss rate before adjustment, it indicates that the uplink packet loss rate of the NR cell has been improved. At this time, the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth remains unchanged, and the next detection cycle is subsequently entered; when the adjusted uplink packet loss rate is greater than or equal to the uplink packet loss rate before adjustment, it indicates that the uplink packet loss rate of the NR cell has not been improved. This may be because the reduced uplink / downlink time slot threshold value is not enough, and users with far locations or poor wireless quality still find it difficult to switch from BWP2 to BWP1. At this time, the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth continues to be lowered until the adjusted uplink packet loss rate is less than the uplink packet loss rate before adjustment, then the time slot threshold value is stopped being adjusted, and the next detection cycle is subsequently entered.

[0075] Specifically, when the reference parameter is the proportion of the total effective time of the second bandwidth, the time of all users in the connected state can be calculated. Since there is no statistics on the total online time of RRC users, it is necessary to convert the average number of RRC users into the RRC user online time, that is, the proportion of the total effective time is obtained by calculating the ratio of the fixed online time of the second bandwidth and the total online time of users based on the radio resource control protocol RRC.

[0076] For example, the embodiments of the present invention provide two calculation methods for the proportion of the total effective duration. Taking hourly traffic statistics as an example: BWP2 total effective duration ratio = BWP2 online duration / (3600 * average number of users in connected state), where the total user online duration based on the radio resource control protocol RRC = 3600 * average number of users in connected state; Taking daily traffic statistics as an example: BWP2 total effective duration ratio = BWP2 online duration / (3600 * 24 * average number of users in connected state); where the total user online duration based on the radio resource control protocol RRC = 3600 * 24 * average number of users in connected state.

[0077] RRC is the link status information of the three-layer wireless signaling connection protocol. It is initiated by the UE, but a UE can establish multiple RRC links. The number of connected users indicates the number of online users. The maximum number of online users in LTE is the maximum number of RRC connected users that each cell can support, which reflects the system's maximum tolerance for the number of users. Since BWP switching refers to the behavior of the UE in the RRC connected state, the total online time of RRC users counted above is actually the online time of the terminal when the UE switches from BWP2 to BWP1. After lowering the time slot threshold value for the current cell to switch from the first bandwidth to the second bandwidth, it is easier for the terminal to switch from BWP2 to BWP1. Therefore, the average number of users in the RRC connected state at this time increases, which reduces the proportion of the total effective time of BWP2. Therefore, when the adjusted total effective duration ratio is less than the total effective duration ratio before adjustment, the time slot threshold value for the current cell to switch from the first bandwidth to the second bandwidth is kept unchanged, and the next detection cycle is subsequently entered; when the adjusted total effective duration ratio is greater than or equal to the total effective duration ratio before adjustment, the time slot threshold value for the current cell to switch from the first bandwidth to the second bandwidth is continued to be lowered until the adjusted total effective duration ratio is less than the total effective duration ratio before adjustment, then the time slot threshold value is stopped being adjusted, and the next detection cycle is subsequently entered.

[0078] In an embodiment of the present invention, after the bandwidth switching strategy is adjusted once in the current detection cycle, before entering the next detection cycle, it is first evaluated based on the detected reference parameters whether the time slot threshold value after this adjustment meets the requirements. If so, the adjustment is stopped; otherwise, the adjustment is continued until the time slot threshold value meets the requirements, so that the bandwidth switching strategy of the current cell is adjusted to the best, ensuring that the 5G terminal in the uplink coverage limited scenario can switch from BWP2 to BWP1 quickly.

[0079] Compared with the prior art, the method for adjusting the cell bandwidth switching strategy disclosed in the present invention has the following beneficial effects:

[0080] 1. This solves the problem of directly disabling the BWP function of the NR TDD cell when the uplink coverage of the NR TDD network is limited in the existing technology. This will not cause the terminal to use the full bandwidth of the 5G cell for each service, reduce terminal power consumption, and avoid wasting 5G air interface resources. This adjustment strategy is only for 5G users in weak coverage scenarios (shortening the time it takes to switch from BWP1 to BWP2) and has no impact on other 5G users in the cell, thus taking into account both 5G user usage perception and 5G terminal energy saving effects.

[0081] 2. By modifying the bandwidth switching strategy of cells with limited uplink coverage, the user experience of 5G terminals in scenarios with limited uplink coverage can be avoided. This allows terminals at the coverage edge of the cell to quickly switch from narrow bandwidth to full bandwidth when they need to transmit or receive large data packets, thereby improving the transmission performance of the terminals.

[0082] 3. Dynamically adjust the BWP switching strategy of the NR cell according to the statistics of different periods. If it is found that the number of users with limited uplink coverage in the NRTDD cell decreases, the previously modified BWP switching strategy will be rolled back to the initial state to minimize UE power consumption while ensuring user performance.

[0083] 4. After the 5G terminal switches from BWP1 to BWP2 in a weak coverage scenario, it may not be able to parse the downlink DCI normally in a weak coverage environment, resulting in inconsistency between the BWP status on the network side and the BWP status on the terminal side, which in turn causes disconnection problems. Therefore, accelerating the switching of 5G terminals from BWP2 to BWP1 in weak coverage scenarios can avoid disconnection problems of 5G terminals in scenarios with limited uplink coverage.

[0084] See also Figure 2 , Figure 2 1 is a structural block diagram of a cell bandwidth switching strategy adjustment device 100 provided in an embodiment of the present invention. The cell bandwidth switching strategy adjustment device 100 includes:

[0085] The data acquisition module 11 is configured to obtain the number of successful allocations of uplink resources by the current cell to the terminal at different aggregation levels within a current detection period; wherein the uplink resources are allocated by the physical downlink control channel of the current cell through downlink control information;

[0086] A data calculation module 12 is configured to calculate a ratio of a target number of successful uplink resource allocations to a terminal at a target aggregation level to a total number of successful allocations;

[0087] The bandwidth switching strategy adjustment module 13 is configured to reduce a timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth when the times ratio is greater than or equal to a ratio threshold; wherein the first bandwidth is smaller than the second bandwidth.

[0088] Specifically, the bandwidth switching strategy adjustment module 13 is further configured to: when the number ratio is greater than a set ratio threshold, keep the throughput threshold for switching the current cell from the first bandwidth to the second bandwidth unchanged.

[0089] Specifically, the bandwidth switching strategy adjustment module 13 is also used to: after lowering the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth, after entering a new detection cycle, when it is detected that the number ratio is less than or equal to the ratio threshold value, restore the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth to the initial time slot threshold value.

[0090] Specifically, the bandwidth switching strategy adjustment module 13 is also used to: after lowering the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth, obtain the reference parameters of the current cell before and after adjusting the switching strategy; when the adjusted reference parameters and the reference parameters before adjustment meet the preset bandwidth improvement conditions, keep the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth unchanged; when the adjusted reference parameters and the reference parameters before adjustment do not meet the preset bandwidth improvement conditions, continue to lower the time slot threshold value for switching the current cell from the first bandwidth to the second bandwidth.

[0091] Specifically, the reference parameter is an uplink packet loss rate; then, the bandwidth improvement condition is that the adjusted uplink packet loss rate is less than the uplink packet loss rate before adjustment.

[0092] Specifically, the reference parameter is the proportion of the total effective time of the second bandwidth; then, the bandwidth improvement condition is that the proportion of the total effective time after adjustment is less than the proportion of the total effective time before adjustment.

[0093] Specifically, the proportion of the total effective duration is obtained by calculating the ratio of the fixed online duration of the second bandwidth to the total online duration of users based on the radio resource control protocol.

[0094] It is worth noting that the working process of each module in the cell bandwidth switching strategy adjustment device 100 according to the embodiment of the present invention can refer to the working process of the cell bandwidth switching strategy adjustment method according to the above embodiment, and will not be repeated here.

[0095] Compared with the prior art, the cell bandwidth switching strategy adjustment device 100 disclosed in the present invention has the following advantages:

[0096] Beneficial effects:

[0097] 1. This solves the problem of directly disabling the BWP function of the NR TDD cell when the uplink coverage of the NR TDD network is limited in the existing technology. This will not cause the terminal to use the full bandwidth of the 5G cell for each service, reduce terminal power consumption, and avoid wasting 5G air interface resources. This adjustment strategy is only for 5G users in weak coverage scenarios (shortening the time it takes to switch from BWP1 to BWP2) and has no impact on other 5G users in the cell, thus taking into account both 5G user usage perception and 5G terminal energy saving effects.

[0098] 2. By modifying the bandwidth switching strategy of cells with limited uplink coverage, the user experience of 5G terminals in scenarios with limited uplink coverage can be avoided. This allows terminals at the coverage edge of the cell to quickly switch from narrow bandwidth to full bandwidth when they need to transmit or receive large data packets, thereby improving the transmission performance of the terminals.

[0099] 3. Dynamically adjust the BWP switching strategy of the NR cell according to the statistics of different periods. If it is found that the number of users with limited uplink coverage in the NRTDD cell decreases, the previously modified BWP switching strategy will be rolled back to the initial state to minimize UE power consumption while ensuring user performance.

[0100] 4. After the 5G terminal switches from BWP1 to BWP2 in a weak coverage scenario, it may not be able to parse the downlink DCI normally in a weak coverage environment, resulting in inconsistency between the BWP status on the network side and the BWP status on the terminal side, which in turn causes disconnection problems. Therefore, accelerating the switching of 5G terminals from BWP2 to BWP1 in weak coverage scenarios can avoid disconnection problems of 5G terminals in scenarios with limited uplink coverage.

[0101] See also Figure 3 , Figure 3 This is a structural block diagram of a cell bandwidth switching policy adjustment device 200 provided in an embodiment of the present invention. The cell bandwidth switching policy adjustment device 200 includes a processor 21, a memory 22, and a computer program stored in the memory 22 and executable on the processor 21. When the processor 21 executes the computer program, the steps of the above-mentioned cell bandwidth switching policy adjustment method embodiments, such as steps S1 to S3, are implemented.

[0102] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory 22 and executed by the processor 21 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program in the cell bandwidth switching policy adjustment device 200.

[0103] The cell bandwidth switching policy adjustment device 200 may include, but is not limited to, a processor 21 and a memory 22. Those skilled in the art will appreciate that the schematic diagram is merely an example of the cell bandwidth switching policy adjustment device 200 and does not limit the cell bandwidth switching policy adjustment device 200. The cell bandwidth switching policy adjustment device 200 may include more or fewer components than shown in the diagram, or may combine certain components or different components. For example, the cell bandwidth switching policy adjustment device 200 may further include input and output devices, network access devices, buses, and the like.

[0104] The processor 21 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. The processor 21 is the control center of the cell bandwidth switching policy adjustment device 200, and connects various parts of the cell bandwidth switching policy adjustment device 200 using various interfaces and lines.

[0105] The memory 22 can be used to store the computer programs and / or modules. The processor 21 implements the various functions of the cell bandwidth switching policy adjustment device 200 by running or executing the computer programs and / or modules stored in the memory 22 and calling the data stored in the memory 22. The memory 22 may mainly include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area may store data generated based on the use of the mobile phone (such as audio data, a phone book, etc.). In addition, the memory 22 may include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0106] Wherein, if the module / unit integrated in the cell bandwidth switching policy adjustment device 200 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor 21, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0107] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for adjusting a cell's bandwidth switching strategy, characterized in that: include: Obtaining the number of successful uplink resource allocations to the terminal by the current cell at different aggregation levels within the current detection period; wherein the uplink resources are allocated by the physical downlink control channel of the current cell through downlink control information; Calculate the ratio of the target number of successful uplink resource allocations to the terminal at the target aggregation level to the total number of successful allocations; wherein the target aggregation level is the first n aggregation levels ranked largest among several different aggregation levels, and 1≤n≤3; When the number ratio is greater than a ratio threshold, a time slot threshold for switching the current cell from a first bandwidth to a second bandwidth is reduced; wherein the first bandwidth is smaller than the second bandwidth.

2. The method for adjusting the bandwidth switching strategy of a cell according to claim 1, wherein: When the number ratio is greater than a set ratio threshold, the method further includes: The throughput threshold value for switching the current cell from the first bandwidth to the second bandwidth remains unchanged.

3. The method for adjusting the bandwidth switching strategy of a cell according to claim 1, wherein: After lowering the timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth, the method further includes: After entering a new detection cycle, when it is detected that the number ratio is less than or equal to the ratio threshold, the time slot threshold for switching the current cell from the first bandwidth to the second bandwidth is restored to the initial time slot threshold.

4. The method for adjusting the bandwidth switching strategy of a cell according to claim 1, wherein: After lowering the timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth, the method further includes: Respectively obtaining reference parameters of the current cell before and after adjusting the handover strategy; When the adjusted reference parameter and the reference parameter before adjustment meet a preset bandwidth improvement condition, maintaining the timeslot threshold value for switching the current cell from the first bandwidth to the second bandwidth unchanged; When the adjusted reference parameter and the reference parameter before adjustment do not meet the preset bandwidth improvement condition, the timeslot threshold for switching the current cell from the first bandwidth to the second bandwidth continues to be reduced.

5. The method for adjusting the bandwidth switching strategy of a cell according to claim 4, wherein: The reference parameter is the uplink packet loss rate; then, the bandwidth improvement condition is that the adjusted uplink packet loss rate is less than the uplink packet loss rate before the adjustment.

6. The method for adjusting the bandwidth switching strategy of a cell according to claim 4, wherein: The reference parameter is the proportion of the total effective time of the second bandwidth; then, the bandwidth improvement condition is that the proportion of the total effective time after adjustment is less than the proportion of the total effective time before adjustment.

7. The method for adjusting the bandwidth switching strategy of a cell according to claim 6, wherein: The total effective duration ratio is obtained by calculating the ratio of the fixed online duration of the second bandwidth to the total online duration of users based on the radio resource control protocol.

8. A cell bandwidth switching strategy adjustment device, characterized in that: include: A data acquisition module, configured to acquire, within a current detection period, the number of successful allocations of uplink resources by the current cell to the terminal at different aggregation levels; wherein the uplink resources are allocated by the physical downlink control channel of the current cell through downlink control information; a data calculation module, configured to calculate a ratio of a target number of successful uplink resource allocations to a terminal at a target aggregation level to a total number of successful allocations; wherein the target aggregation level is the first n aggregation levels ranked largest among a plurality of different aggregation levels, and 1≤n≤3; The bandwidth switching strategy adjustment module is configured to reduce a time slot threshold for switching the current cell from a first bandwidth to a second bandwidth when the number ratio is greater than or equal to a ratio threshold; wherein the first bandwidth is smaller than the second bandwidth.

9. A cell bandwidth switching strategy adjustment device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for adjusting the bandwidth switching strategy of a cell according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the method for adjusting the bandwidth switching strategy of a cell according to any one of claims 1 to 7.

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