A SIM switching method based on cell channel quality

Abstract

The present invention relates to a SIM switching method based on cell channel quality. The comprehensive cell channel quality information Priority is introduced, and it is bound with the cell uplink and downlink signal-to-noise ratio and the uplink and downlink channel idle rate to evaluate the comprehensive cell channel quality; based on the comprehensive cell channel quality information Priority, the quality of the network is selected by comparing the cell channel quality of different SIMs, and the best network is always selected for residence. The present invention can ensure that the 5G remote communication module always resides in the best network environment.

Description

Technical Field

[0001] The invention belongs to the field of reliability communication, and in particular relates to a SIM switching method based on cell channel quality. Background Art

[0002] In the power grid system, the power collection terminal is an important business terminal. It can collect data from electric meters and various sensors, and integrate 5G remote communication modules through reserved communication warehouses, and transmit the collected data back to the business main station through 5G connection. The 5G remote communication module has a SIM card slot, and you can obtain network connection by purchasing a SIM card from the operator. Common power collection terminals include energy controllers, concentrators, special transformer collection terminals, intelligent fusion terminals in substations, three-phase meters, etc., all of which need to obtain 5G network connections through matching 5G remote communication modules.

[0003] The existing 5G telecommunication module can be embedded with two or more user identity modules (SIMs), which can be in the form of ordinary pluggable SIM cards or eSIM chips. Each user identity module corresponds to a telecom operator, and can provide legal identity information for the 5G telecommunication module to access the network under the corresponding operator's network, so that it has 5G network access capabilities. In the above solution, by integrating multiple SIMs, the 5G telecommunication module improves communication reliability. When a SIM cannot be connected due to environmental factors or poor network coverage, the backup SIM can be switched to ensure communication reliability.

[0004] The quality of 5G cell channels can usually be characterized by the uplink signal-to-noise ratio (SINR), the downlink signal-to-noise ratio (SINR), the cell uplink channel idle rate, and the cell downlink channel idle rate, which can affect the accuracy and timeliness of data transmission. The larger the SINR, the greater the useful signal strength, and the easier it is for the base station and the terminal to correctly receive the transmitted data; conversely, the more difficult it is to correctly receive the transmitted data. The larger the channel idle rate, the more idle resources there are on the transmission channel, and the base station can schedule the uplink and downlink data for transmission more timely, and the transmission delay is smaller; conversely, the transmission delay is greater.

[0005] The uplink signal-to-noise ratio is calculated by the base station, uplink signal-to-noise ratio = S_UL / (I_UL+N_UL), where S_UL represents the uplink useful signal power received by the base station, I_UL represents the uplink interference signal power received by the base station, and N_UL represents the uplink noise power received by the base station. The uplink signal-to-noise ratio is recorded as UL_SINR.

[0006] The downlink signal-to-noise ratio is calculated by the terminal, downlink signal-to-noise ratio = S_DL / (I_DL+N_DL), where S_DL represents the downlink useful signal power received by the 5G terminal, I_DL represents the downlink interference signal power received by the 5G terminal, and N_DL represents the downlink noise power received by the 5G terminal. The downlink signal-to-noise ratio is recorded as DL_SINR.

[0007] The cell uplink channel idle rate is calculated by the base station and represents the congestion level of the cell uplink channel. In 5G technology, PUSCH transmits uplink data, and PUSCH is selected as the cell uplink channel for calculation. Cell uplink channel idle rate = 1-PUSCH occupancy / PUSCH total amount. The larger the cell uplink channel idle rate, the lower the congestion level of the cell uplink channel. The cell uplink channel idle rate is recorded as UL_IDLE_RATE.

[0008] The idle rate of the cell downlink channel is calculated by the base station and represents the congestion level of the cell downlink channel. In 5G technology, PDSCH transmits downlink data. Here, PDSCH is selected as the cell downlink channel for calculation. The idle rate of the cell downlink channel = 1-PDSCH occupancy / PDSCH total amount. The larger the idle rate of the cell downlink channel, the lower the congestion level of the cell downlink channel. The idle rate of the cell downlink channel is recorded as DL_IDLE_RATE.

[0009] For 5G remote communication modules that integrate multiple user identity modules (SIMs), the existing mechanism cannot accurately determine which SIM has the best network conditions, and thus cannot ensure that the terminal always stays in the best network environment, and cannot further improve communication reliability. Summary of the invention

[0010] The object of the present invention is to provide a SIM switching method based on cell channel quality, which is used to control the switching of a 5G telecommunication module between different user identity modules (SIMs) to ensure that the 5G telecommunication module always resides in the optimal network environment.

[0011] To achieve the above purpose, the technical solution of the present invention is: a SIM switching method based on cell channel quality, introducing comprehensive cell channel quality information Priority, and binding it with the cell uplink and downlink signal-to-noise ratio and uplink and downlink channel idle rate to evaluate the comprehensive cell channel quality; based on the comprehensive cell channel quality information Priority, the quality of the network is selected by comparing the cell channel quality of different SIMs, and the best network is always selected for residence. In the calculation of the comprehensive cell channel quality information Priority, a weight calculation method is introduced.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The SIM switching mechanism based on the cell channel quality introduces an adaptive SIM switching strategy for the remote communication module to ensure that the module always resides in the network with the best network quality.

[0014] 2. The SIM switching mechanism based on the cell channel quality only needs to initiate random access during the detection process. There is no need to actually initiate network attachment, nor is there any need to initiate business layer data transmission. There is no need to use traffic, thus avoiding additional traffic charges. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention provides a method for transmitting cell channel quality parameters based on a random access process. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.

[0017] The present invention discloses a SIM switching method based on cell channel quality, which introduces comprehensive cell channel quality information Priority and binds it with cell uplink and downlink signal-to-noise ratio and uplink and downlink channel idle rate to evaluate the comprehensive cell channel quality; based on the comprehensive cell channel quality information Priority, the quality of the network is selected by comparing the cell channel quality of different SIMs, and the best network is always selected for residence. In the calculation of the comprehensive cell channel quality information Priority, a weight calculation method is introduced.

[0018] The following is the specific implementation process of the present invention.

[0019] The present invention proposes a SIM switching mechanism based on cell channel quality, which is used to control the switching of the 5G telecommunication module between different user identity modules (SIMs) to ensure that the 5G telecommunication module always resides in the best network environment. The specific method is as follows:

[0020] 1. Cell Channel Quality Parameter Transmission Mechanism

[0021] UL_SINR, UL_IDLE_RATE, and DL_IDLE_RATE are calculated by the base station and cannot be directly obtained by the 5G remote communication module.

[0022] Based on the random access process, the present invention puts the three cell channel quality parameters UL_SINR, UL_IDLE_RATE and DL_IDLE_RATE into the MSG4 message and transmits it to the 5G remote communication module, which processes it uniformly, determines the SIM channel switching timing based on the SIM switching algorithm, and performs the SIM switching operation. Figure 1 shown.

[0023] 2. SIM switching mechanism based on cell channel quality

[0024] 1. Let the number of 5G telecommunication module user identity modules (SIMs) be n.

[0025] 2. λ_UL_SINR is an n×1 vector, recording the uplink SINRs of n SIMs.

[0026] 3. For the n uplink SINRs in λ_UL_SINR, select the minimum uplink SINR as the reference value for normalization. The minimum uplink SINR is normalized to the reference value 1, and the other uplink SINRs are normalized to the ratio to the minimum uplink SINR. The normalized new vector is recorded as λ_UL_SINR_norm, and the SIM order in λ_UL_SINR_norm is consistent with the SIM order in λ_UL_SINR.

[0027] 4. λ_DL_SINR is an n×1 vector that records the downlink SINRs of n SIMs. The order of SIMs in λ_DL_SINR is consistent with that in λ_UL_SINR.

[0028] 5. For the n downlink SINRs in λ_DL_SINR, select the minimum downlink SINR as the reference value for normalization. The minimum downlink SINR is normalized to the reference value 1, and the other downlink SINRs are normalized to the ratio to the minimum downlink SINR. The normalized new vector is recorded as λ_DL_SINR_norm, and the SIM order in λ_DL_SINR_norm is consistent with the SIM order in λ_DL_SINR.

[0029] 6. λ_UL_IDLE_RATE is an n×1 vector, which records the cell uplink channel idle rate of the cells corresponding to n SIMs. The SIM order in λ_UL_IDLE_RATE is consistent with the SIM order in λ_UL_SINR.

[0030] 7. For the n cell uplink channel idle rates in λ_UL_IDLE_RATE, select the smallest cell uplink channel idle rate as the reference value for normalization. The smallest cell uplink channel idle rate is normalized to the reference value 1, and the uplink channel idle rates of other cells are normalized to the ratio of the smallest cell uplink channel idle rate. The normalized new vector is denoted as λ_UL_IDLE_RATE_norm, and the SIM order in λ_UL_IDLE_RATE_norm is consistent with the SIM order in λ_UL_IDLE_RATE.

[0031] 8. λ_DL_IDLE_RATE is an n×1 vector, which records the cell downlink channel idle rate of the cells corresponding to n SIMs. The SIM order in λ_DL_IDLE_RATE is consistent with the SIM order in λ_UL_SINR.

[0032] 9. For the n cell downlink channel idle rates in λ_DL_IDLE_RATE, select the smallest cell downlink channel idle rate as the reference value for normalization. The smallest cell downlink channel idle rate is normalized to the reference value 1, and the downlink channel idle rates of other cells are normalized to the ratio of the smallest cell downlink channel idle rate. The normalized new vector is recorded as λ_DL_IDLE_RATE_norm, and the SIM order in λ_DL_IDLE_RATE_norm is consistent with the SIM order in λ_DL_IDLE_RATE.

[0033] 10. Set weight values ​​α1, α2, β1, and β2. The range of the four weight values ​​is [0, 1].

[0034] 11. Let Priority be an n×1 vector, and let Priority = α1×λ_UL_SINR_norm+α2×λ_DL_SINR_norm+β1×λ_UL_IDLE_RATE_norm+β2×λ_DL_IDLE_RATE_norm.

[0035] 12. The n data dimensions of Priority represent the comprehensive cell channel quality information of the operator cells corresponding to the n SIMs. The comprehensive cell channel quality information covers the cell uplink signal-to-noise ratio, the cell downlink signal-to-noise ratio, the cell uplink channel idle rate, and the cell downlink channel idle rate.

[0036] 13. The weight values ​​α1, α2, β1, and β2 are configurable. By adjusting the values ​​of the weights α1, α2, β1, and β2, the influence of the uplink signal-to-noise ratio, the downlink signal-to-noise ratio, the uplink cell channel idle rate, and the downlink cell channel idle rate on the comprehensive cell channel quality can be adjusted respectively, thereby adjusting the comprehensive cell channel quality preference.

[0037] 14. The 5G remote communication module calculates the maximum value of the Priority vector Priority(i), 1≤i≤n, where i represents the i-th SIM. Priority(i) is the largest, indicating that the comprehensive cell channel quality of the operator cell corresponding to SIM_i is the best, which means that the wireless channel quality under the network corresponding to SIM_i is better and the wireless congestion is less, that is, the overall network situation is better.

[0038] 15. Select SIM_i as the user identity module of the 5G remote communication module, and subsequently initiate network access with SIM_i.

[0039] 16. At interval T, recalculate Priority(i) according to the above steps. If the recalculated SIM is the same as the currently used SIM, continue to use the current SIM; if it is different from the currently used SIM, switch to the new SIM and re-initiate network access. The interval T is configurable.

[0040] The above are preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, as long as the resulting functions do not exceed the scope of the technical solution of the present invention, belong to the protection scope of the present invention.

Claims

1. A SIM switching method based on cell channel quality, characterized in that: The comprehensive cell channel quality information Priority is introduced and bound to the cell uplink and downlink signal-to-noise ratio and uplink and downlink channel idle rate to evaluate the comprehensive cell channel quality. Based on the comprehensive cell channel quality information Priority, the quality of the network is evaluated by comparing the cell channel quality of different SIMs, and the best network is always selected for residence. In the calculation of the comprehensive cell channel quality information Priority, a weight calculation method is introduced; The specific implementation steps of this method are as follows: Step S1: Based on the random access process, three cell channel quality parameters, namely, uplink signal-to-noise ratio UL_SINR, cell uplink channel idle rate UL_IDLE_RATE, and cell downlink channel idle rate DL_IDLE_RATE, are put into the MSG4 message and transmitted to the 5G remote communication module; Step S2: SIM switching mechanism based on cell channel quality: S21, record the number of 5G telecommunication module user identity modules, i.e., SIM cards, as n; S22, let λ_UL_SINR be an n×1 vector, recording the uplink signal-to-noise ratio of n SIMs, i.e., uplink SINR; S23. For the n uplink SINRs in λ_UL_SINR, select the minimum uplink SINR as a reference value for normalization; the minimum uplink SINR is normalized to the reference value 1, and the other uplink SINRs are normalized to the ratio to the minimum uplink SINR; the normalized new vector is recorded as λ_UL_SINR_norm, and the SIM order in λ_UL_SINR_norm is consistent with the SIM order in λ_UL_SINR; S24, let λ_DL_SINR be an n×1 vector, recording the downlink signal-to-noise ratio of n SIMs, that is, the downlink SINR; the order of SIMs in λ_DL_SINR is consistent with the order of SIMs in λ_UL_SINR; S25. For the n downlink SINRs in λ_DL_SINR, select the minimum downlink SINR as the reference value for normalization; the minimum downlink SINR is normalized to the reference value 1, and the other downlink SINRs are normalized to the ratio to the minimum downlink SINR; the normalized new vector is recorded as λ_DL_SINR_norm, and the SIM order in λ_DL_SINR_norm is consistent with the SIM order in λ_DL_SINR; S26. λ_UL_IDLE_RATE is recorded as an n×1 vector, recording the cell uplink channel idle rates of the cells corresponding to n SIMs; the SIM order in λ_UL_IDLE_RATE is consistent with the SIM order in λ_UL_SINR; S27. For the n cell uplink channel idle rates in λ_UL_IDLE_RATE, select the smallest cell uplink channel idle rate as a reference value for normalization; the smallest cell uplink channel idle rate is normalized to the reference value 1, and the uplink channel idle rates of other cells are normalized to the ratio to the smallest cell uplink channel idle rate; the normalized new vector is recorded as λ_UL_IDLE_RATE_norm, and the SIM order in λ_UL_IDLE_RATE_norm is consistent with the SIM order in λ_UL_IDLE_RATE; S28. λ_DL_IDLE_RATE is recorded as an n×1 vector, recording the cell downlink channel idle rates of the cells corresponding to n SIMs; the SIM order in λ_DL_IDLE_RATE is consistent with the SIM order in λ_UL_SINR; S29. For the n cell downlink channel idle rates in λ_DL_IDLE_RATE, select the smallest cell downlink channel idle rate as the reference value for normalization; the smallest cell downlink channel idle rate is normalized to the reference value 1, and the downlink channel idle rates of other cells are normalized to the ratio to the smallest cell downlink channel idle rate; the normalized new vector is recorded as λ_DL_IDLE_RATE_norm, and the SIM order in λ_DL_IDLE_RATE_norm is consistent with the SIM order in λ_DL_IDLE_RATE; S210, setting weight values ​​α1, α2, β1, β2; the value range of the four weight values ​​is [0,1]; S211. Let Priority be an n×1 vector, and let Priority=α1×λ_UL_SINR_norm+α2×λ_DL_SINR_norm+β1×λ_UL_IDLE_RATE_norm+β2×λ_DL_IDLE_RATE_norm; S212, the n data dimensions of Priority represent the comprehensive cell channel quality information of the operator cells corresponding to the n SIMs, and the comprehensive cell channel quality information includes the cell uplink signal-to-noise ratio, the cell downlink signal-to-noise ratio, the cell uplink channel idle rate, and the cell downlink channel idle rate; S213, weight values ​​α1, α2, β1, β2 are configurable. By adjusting the values ​​of α1, α2, β1, β2, the influence of uplink signal-to-noise ratio, downlink signal-to-noise ratio, cell uplink channel idle rate, and cell downlink channel idle rate on the comprehensive cell channel quality are adjusted respectively; S214, the 5G remote communication module calculates the maximum value of the Priority vector Priority (i), 1≤i≤n, where i represents the i-th SIM; Priority (i) is the largest, indicating that the comprehensive cell channel quality of the operator cell corresponding to SIM_i is the best, which means that the wireless channel quality under the network corresponding to SIM_i is better and the wireless congestion level is smaller, that is, the overall network situation is better; S215, selecting SIM_i as the user identity module of the 5G remote communication module, and subsequently initiating network access with SIM_i; S216. After an interval of time T, recalculate Priority (i) according to the above steps; if the recalculated SIM is the same as the currently used SIM, continue to use the current SIM; If it is different from the currently used SIM card, switch to the new SIM card and re-initiate network access; The interval time T is configurable.

Images