A method for resisting frequency burst interference based on a 5G system

Abstract

The application discloses a frequency burst interference resisting method based on a 5G system, and relates to the wireless communication field, which comprises the following steps: when the 5G system is in an access stage, performing uplink interference detection and downlink PBCH frequency hopping; based on the uplink interference detection result, performing resource allocation to avoid interference, and based on the downlink PBCH frequency hopping, randomizing the interference to avoid the interference and improving the access success rate of the UE in the access stage; when the 5G system is in a service stage, performing uplink interference detection and downlink interference detection, and based on the detection results, performing uplink and downlink PUSCH and PDSCH interference resisting scheduling and power control to improve the uplink and downlink service throughput; by the above method, the application can effectively improve the access success rate of the 5G system and the service rate under the condition of the same frequency narrowband interference.

Description

Technical Field

[0001] This invention relates to the field of wireless communication, and more specifically to a method for resisting frequency burst interference based on a 5G system. Background Technology

[0002] The statements in this section are provided only as background information in connection with this disclosure and may not constitute prior art.

[0003] In certain special applications of 5G, there may be application scenarios where it coexists with other technologies, such as coexisting with broadcast television signals. In these scenarios, 5G systems are broadband systems, while television systems are generally narrowband systems. When television signals fall within the frequency band of the 5G system, they will interfere with the 5G system and cause a decrease in the performance of the 5G system. Summary of the Invention

[0004] The purpose of this invention is to address the problem that other narrow-bandwidth signals may fall into the frequency band of the 5G system during actual use, causing interference and degrading the performance of the 5G system. This invention provides a method for resisting frequency burst interference in the 5G system, which can detect and avoid interference, improve the performance of the 5G system, and solve the above-mentioned problems.

[0005] The technical solution of the present invention is as follows:

[0006] A method for resisting frequency burst interference based on a 5G system includes:

[0007] During the access phase of a 5G system, uplink interference detection and downlink "PBCH frequency hopping" are performed. Based on the uplink interference detection results, resources are allocated to avoid interference, and the downlink "PBCH frequency hopping" randomizes interference to avoid it, thereby improving the access success rate of the UE during the access phase.

[0008] During the operational phase of a 5G system, uplink and downlink interference detection are performed, and based on the detection results, uplink and downlink PUSCH and PDSCH anti-interference scheduling and power control are implemented to improve uplink and downlink service throughput.

[0009] Furthermore, the uplink interference detection includes:

[0010] Uplink interference is detected by scanning frequencies at base stations.

[0011] Furthermore, the base station frequency scanning includes:

[0012] In the GP, an interference detection symbol is fixed, and the base station periodically detects the received signal power on each subcarrier of the interference detection symbol to accurately obtain the uplink interference situation.

[0013] Furthermore, the resource allocation based on uplink interference detection results includes:

[0014] MSG3 / MSG5 allocates resources based on uplink interference detection results.

[0015] Furthermore, the downlink "PBCH frequency hopping" includes:

[0016] Interference is detected via UE.

[0017] Furthermore, the "PBCH frequency hopping" includes:

[0018] 1. Definition of resource set:

[0019] Given a fixed center frequency and bandwidth, a set of resources for a specific SSB is calculated and allocated based on the determined center frequency and bandwidth. This set is called the SSB resource set, and the frequency domain resources of each SSB in the SSB resource set do not overlap with each other.

[0020] After the SSB resource set is confirmed, a corresponding CORESET#0 resource is calculated for each SSB resource, which is defined as the CORESET#0 resource set. Each CORESET#0 in the CORESET#0 resource set is associated with its corresponding SSB.

[0021] After the SSB resource set is confirmed, a corresponding SIB1 time-frequency resource needs to be calculated for each SSB resource, which is defined as the SIB1 resource set. The positional relationship between SSB and SIB1 overlaps in the frequency domain.

[0022] Each SIB1 message carries RACH configuration information corresponding to its SSB, which is used to provide the UE with the base station configuration information for access, and is defined as a RACH resource set;

[0023] 2. Search process:

[0024] The base station PBCH transmission period is 20ms, and the frequency hopping period is the same as the PBCH transmission period, which is also 20ms. The UE search SSB period can be configured to 5ms, 10ms, 20ms, 40ms, 80ms or 160ms. Among them, the UE search SSB period is configured by the higher layer parameter ssb-periodicityServingCell in the access procedure.

[0025] To ensure UE periodic synchronization, the frequency hopping number requirements are as follows:

[0026] When the SSB period is 20ms, the maximum number of frequency hopping supported is 1;

[0027] When the SSB period is 40ms, the maximum number of frequency hopping supported is 2;

[0028] When the SSB period is 80ms, the maximum number of frequency hopping supported is 4;

[0029] When the SSB period is 160ms, the maximum number of frequency hopping supported is 8;

[0030] 3. Access process:

[0031] After synchronizing with the base station, the UE searches for the corresponding CORESET#0 space based on the MIB information, receives SIB1 information, obtains the associated RACH configuration information, configures it accordingly, and initiates access to the base station.

[0032] The base station will detect the UE's preamble in a certain slot and send RAR authorization to the UE based on the detected preamble, thereby completing the subsequent access process;

[0033] In the NR protocol, the high-level parameter ssb-perRACH-OccasionAndCB-PreamblePerSSB configures N SSBs to be associated with a PRACH occasion, and the number of preambles that each SSB is given to compete for each valid PRACH occasion.

[0034] Furthermore, the downlink "PBCH frequency hopping" includes:

[0035] The MSG2 / MSG4 downlink messages are allocated to the same RB position as the PBCH via resource allocation.

[0036] Furthermore, the downlink interference detection includes:

[0037] Downlink CQI detection is performed when the UE is in linked state. Downlink interference detection is performed using CSI-RS resources. The UE detects CQI on the subband of the CSI-RS resources to reflect the interference situation.

[0038] CSI-RS resources also support three behaviors: periodic, semi-static, and aperiodic.

[0039] Furthermore, the anti-interference scheduling includes:

[0040] Based on the uplink / downlink subband CQI detection results, the scheduling priority of each subband is calculated, and scheduling is performed on each subband according to the subband scheduling priority of each UE, so that each UE is scheduled on the subband with the best channel quality.

[0041] Furthermore, the power control includes:

[0042] By scheduling RB resources and controlling power, power convergence is achieved, thereby improving the SNR on the interference subband; in addition, anti-interference scheduling is combined to allocate power according to channel priority.

[0043] Compared with existing technologies, the advantages of this invention are:

[0044] A method for mitigating frequency burst interference in 5G systems includes: during the 5G system access phase, performing uplink interference detection and downlink PBCH frequency hopping; allocating resources based on uplink interference detection results to avoid interference, and randomizing interference based on downlink PBCH frequency hopping to avoid interference, thereby improving the UE access success rate; during the 5G system service phase, performing uplink and downlink interference detection, and performing uplink and downlink PUSCH and PDSCH anti-interference scheduling and power control based on the detection results to improve uplink and downlink service throughput; through the above methods, the 5G access success rate can be effectively improved under co-frequency narrowband interference, while also improving data transmission efficiency and system capacity. Attached Figure Description

[0045] Figure 1 A flowchart of a method for resisting frequency burst interference based on a 5G system;

[0046] Figure 2 An example of an SSB resource set calculated (1);

[0047] Figure 3 An example of an SSB resource set calculated (2);

[0048] Figure 4 This is a schematic diagram showing the positions of SSB and SIB1 as proposed in Example 1;

[0049] Figure 5 This is a schematic diagram of a frequency hopping scheme for resource sets.

[0050] Figure 6 This is a schematic diagram of the anti-interference access process. Detailed Implementation

[0051] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0053] Example 1

[0054] In certain special applications of 5G, there may be application scenarios where it coexists with other technologies, such as coexisting with broadcast television signals. In these scenarios, 5G systems are broadband systems, while television systems are generally narrowband systems. When television signals fall within the frequency band of the 5G system, they will interfere with the 5G system and cause a decrease in the performance of the 5G system.

[0055] This embodiment addresses the aforementioned interference problem by dividing it into two phases: the 5G system access phase and the 5G system service phase. The following issues exist in the design of the anti-interference method for these two phases:

[0056] During the 5G system access phase, the objectives are: to ensure the success rate of terminal access; and to detect interference (downlink interference) at the terminal because the terminal has not yet been connected and cannot send reference signals for interference detection.

[0057] When a 5G system is in the operational phase, the objectives are: to increase 5G cell capacity; and to determine how to detect and avoid interference.

[0058] Therefore, this embodiment addresses the problems existing in the above design process by proposing a method for resisting frequency burst interference based on a 5G system, which can detect and avoid interference and improve the performance of the 5G system.

[0059] For details, please refer to Figure 1-6 A method for resisting frequency burst interference based on a 5G system includes:

[0060] During the access phase of a 5G system, uplink interference detection and downlink PBCH frequency hopping are performed. Resource allocation is based on the uplink interference detection results to avoid interference, and downlink PBCH frequency hopping is used to randomize interference to avoid it, thereby improving the access success rate of the UE during the access phase and allocating downlink message resources. Among these, the interference situation on the base station side can be obtained in advance through uplink interference detection.

[0061] During the 5G system's operational phase, uplink and downlink interference detection are performed, and uplink and downlink PUSCH and PDSCH anti-interference scheduling and power control are implemented based on the detection results to improve uplink and downlink service throughput. In other words, after the cell's 5G system access is completed, anti-interference scheduling can be performed based on the interference detection results, with uplink interference detection referencing the access phase.

[0062] In this embodiment, specifically, the uplink interference detection includes:

[0063] Uplink interference detection is performed by scanning frequencies at base stations; wherein, the base station frequency scanning includes:

[0064] An interference detection symbol is fixed in the GP, and the base station periodically detects the received signal power on each subcarrier of the interference detection symbol to accurately obtain the uplink interference situation. It should be noted that the above uplink interference detection is applicable to both the 5G system access area stage and the 5G system in the service stage.

[0065] In this embodiment, specifically, the resource allocation based on uplink interference detection results includes:

[0066] MSG3 / MSG5 allocates resources based on uplink interference detection results.

[0067] In this embodiment, specifically during the 5G system's access phase, when downlink interference is unknown (depending on UE interference measurement), a "PBCH frequency hopping" scheme is adopted, described as follows:

[0068] 1. Definition of resource set:

[0069] SSB Resource Set:

[0070] Given a fixed center frequency and bandwidth, a set of resources for a specific SSB is calculated and allocated based on the determined center frequency and bandwidth. This set is called the SSB resource set. The frequency domain resources of each SSB in the SSB resource set do not overlap with each other. Theoretically, if there is narrowband interference, there will be one or several SSBs in the frequency band where there is no interference. The UE can use these SSBs to achieve downlink synchronization with the base station and receive SIB1 messages to complete the cell synchronization and network search process.

[0071] The calculation of SSB resources is illustrated with the following example: For frequency points 626724 (corresponding to a center frequency of 3450MHz) and 633440 (corresponding to a center frequency of 3501.6MHz), with a bandwidth of 100MHz, calculate the resources of a set of SSBs respectively. The calculation results are as follows: Figure 2 and Figure 3 As shown.

[0072] CORESET#0 Resource Set:

[0073] After the SSB resource set is confirmed, a corresponding CORESET#0 resource needs to be calculated for each SSB resource, defined as the CORESET#0 resource set. Each CORESET#0 in the CORESET#0 resource set is associated with its corresponding SSB. Specific parameters are specified by the PdcchConfigSIB1 field in the MIB information block. The high 4 bits of this field determine the frequency domain location information of the CORESET#0, and the low 4 bits determine the time slot location information of the receive SIB1. There are three mapping relationships between SSBs and CORESET#0, such as... Figure 4 As shown; in this embodiment, mode 1 is selected, that is, the positional relationship between SSB and SIB1 overlaps in the frequency domain;

[0074] SIB1 Resource Set:

[0075] After the SSB resource set is confirmed, a corresponding SIB1 time-frequency resource needs to be calculated for each SSB resource, which is defined as the SIB1 resource set. The positional relationship between the SSB and SIB1 overlaps in the frequency domain; this is specifically specified by the Pdcch-ConfigSIB1 field in the MIB message.

[0076] RACH Resource Collection:

[0077] Each SIB1 message carries RACH configuration information corresponding to its SSB, which is used to provide the UE with the base station configuration information for access, and is defined as a RACH resource set.

[0078] 2. Search process:

[0079] The base station PBCH transmission period is 20ms, and the frequency hopping period is the same as the PBCH transmission period, which is also 20ms. The UE search SSB period can be configured to 5ms, 10ms, 20ms, 40ms, 80ms or 160ms. Among them, the UE search SSB period is configured by the higher layer parameter ssb-periodicityServingCell in the access procedure.

[0080] To ensure UE periodic synchronization, the frequency hopping number requirements are as shown in Table 1:

[0081] Table 1 Frequency Hopping Number Requirements

[0082] SSB period (ms) Supported maximum number of frequency hopping 20 1 40 2 80 4 160 8

[0083] When the SSB period is 20ms, the maximum number of frequency hopping supported is 1;

[0084] When the SSB period is 40ms, the maximum number of frequency hopping supported is 2;

[0085] When the SSB period is 80ms, the maximum number of frequency hopping supported is 4;

[0086] When the SSB period is 160ms, the maximum number of frequency hopping supported is 8;

[0087] 3. Access process:

[0088] After synchronizing with the base station, the UE searches for the corresponding CORESET#0 space based on the MIB information, receives SIB1 information, obtains the associated RACH configuration information, configures it accordingly, and initiates access to the base station.

[0089] The base station will detect the UE's preamble in a certain slot and send RAR authorization to the UE based on the detected preamble, thereby completing the subsequent access process;

[0090] In the NR protocol, the higher-level parameter ssb-perRACH-OccasionAndCB-PreamblePerSSB configures N (SSB-per-rach-occasion) SSBs to be associated with one PRACH occasion, and the number of preambles (CB-preamble-per-SSB) that each SSB is assigned to compete for each valid PRACH occasion. For example, if N = 1 / 8, then one SSB maps to 8 PRACH occasions; if N = 2, then 2 SSBs map to one PRACH occasion.

[0091] In this embodiment, specifically, the downlink message resource allocation includes:

[0092] Downlink messages such as MSG2 / MSG4 will be allocated to the same RB position as PBCH through resource allocation.

[0093] In this embodiment, specifically, the downlink interference detection includes:

[0094] Downlink CQI detection is performed when the UE is in linked state. Downlink interference detection is performed using CSI-RS resources. The UE detects CQI on the subband of the CSI-RS resources to reflect the interference situation.

[0095] CSI-RS resources also support three behaviors: periodic, semi-static, and aperiodic.

[0096] In this embodiment, specifically, the anti-interference scheduling includes:

[0097] Based on the uplink / downlink subband CQI detection results, the scheduling priority of each subband is calculated, and scheduling is performed on each subband according to the subband scheduling priority of each UE, so that each UE is scheduled on the subband with the best channel quality.

[0098] In this embodiment, specifically, the power control includes:

[0099] By scheduling RB resources and controlling power, power convergence is achieved, thereby improving the SNR on the interference subband; in addition, anti-interference scheduling is combined to allocate power according to channel priority.

[0100] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

[0101] This background section is provided to generally present the context of the invention. The work of the currently named inventors, the work to the extent described in this background section, and aspects described in this section that did not constitute prior art at the time of application are neither expressly nor impliedly acknowledged as prior art to the invention.

Claims

1. A method for resisting frequency burst interference based on a 5G system, characterized in that, include: During the 5G system access phase, uplink interference detection and downlink "PBCH frequency hopping" are performed. Resource allocation is performed based on uplink interference detection results to avoid interference, and downlink "PBCH frequency hopping" is used to randomize interference to avoid interference, thereby improving the UE access success rate during the access phase. During the 5G system's operational phase, uplink and downlink interference detection are performed, and based on the detection results, uplink and downlink PUSCH and PDSCH anti-interference scheduling and power control are implemented to improve uplink and downlink service throughput. The "PBCH frequency hopping" includes: Resource set definition: Given a fixed center frequency and bandwidth, a set of resources for a specific SSB is calculated and allocated based on the determined center frequency and bandwidth. This set is called the SSB resource set, and the frequency domain resources of each SSB in the SSB resource set do not overlap with each other. After the SSB resource set is confirmed, a corresponding CORESET#0 resource is calculated for each SSB resource, which is defined as the CORESET#0 resource set. Each CORESET#0 in the CORESET#0 resource set is associated with its corresponding SSB. After the SSB resource set is confirmed, a corresponding SIB1 time-frequency resource needs to be calculated for each SSB resource, which is defined as the SIB1 resource set. The positional relationship between SSB and SIB1 overlaps in the frequency domain. Each SIB1 message carries RACH configuration information corresponding to its SSB, which is used to provide the UE with the base station configuration information for access, and is defined as a RACH resource set; Search process: The base station PBCH transmission period is 20ms, and the frequency hopping period is the same as the PBCH transmission period, which is also 20ms. The UE search SSB period can be configured to 5ms, 10ms, 20ms, 40ms, 80ms or 160ms. Among them, the UE search SSB period is configured by the higher layer parameter ssb-periodicityServingCell in the access procedure. To ensure UE periodic synchronization, the frequency hopping number requirements are as follows: When the SSB period is 20ms, the maximum number of frequency hopping supported is 1; When the SSB period is 40ms, the maximum number of frequency hopping supported is 2; When the SSB period is 80ms, the maximum number of frequency hopping supported is 4; When the SSB period is 160ms, the maximum number of frequency hopping supported is 8; Access process: After synchronizing with the base station, the UE searches for the corresponding CORESET#0 space based on the MIB information, receives SIB1 information, obtains the associated RACH configuration information, configures it accordingly, and initiates access to the base station. The base station will detect the UE's preamble in a certain slot and send RAR authorization to the UE based on the detected preamble, thereby completing the subsequent access process; In the NR protocol, the higher-level parameter ssb-perRACH-OccasionAndCB-PreamblePerSSB configures N SSBs to be associated with a PRACH occasion, and the number of preambles that each SSB is given for each valid PRACH occasion. The downlink "PBCH frequency hopping" includes: The MSG2 / MSG4 downlink messages are allocated to the same RB position as the PBCH via resource allocation. 2.The method of claim 1, wherein, The uplink interference detection includes: Uplink interference is detected by scanning frequencies at base stations. 3.The method of claim 2, wherein, The base station frequency scanning includes: In the GP, an interference detection symbol is fixed, and the base station periodically detects the received signal power on each subcarrier of the interference detection symbol to accurately obtain the uplink interference situation. 4.The method of claim 1, wherein, The resource allocation based on uplink interference detection results includes: MSG3 / MSG5 allocates resources based on uplink interference detection results. 5.The method of claim 1, wherein, The downlink "PBCH frequency hopping" includes: Interference is detected via UE.

6. The method of claim 1, wherein the method is based on a 5G system. The downlink interference detection includes: Downlink CQI detection is performed when the UE is in linked state. Downlink interference detection is performed using CSI-RS resources. The UE detects CQI on the subband of the CSI-RS resources to reflect the interference situation. CSI-RS resources also support three behaviors: periodic, semi-static, and aperiodic.

7. The method of claim 6, wherein the method is based on a 5G system. The anti-interference scheduling includes: Based on the uplink / downlink subband CQI detection results, the scheduling priority of each subband is calculated, and scheduling is performed on each subband according to the subband scheduling priority of each UE, so that each UE is scheduled on the subband with the best channel quality.

8. A method for resisting frequency burst interference based on a 5G system according to claim 7, characterized in that, The power control includes: By scheduling RB resources and controlling power, power convergence is achieved, thereby improving the SNR on the interference subband; in addition, anti-interference scheduling is combined to allocate power according to channel priority.

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