A 5G terminal cell fast reselection method and a 5G terminal

Abstract

The application provides a 5G terminal cell fast reselection method and a 5G terminal, and relates to the technical field of computer equipment, and comprises the following steps: an application processor continuously acquires a service cell signal and interference plus noise ratio reported by a baseband processor; when it is determined that a fast reselection condition is met, the application processor configures a reselection trigger difference threshold to the baseband processor; the baseband processor performs neighbor cell reselection judgment according to the threshold, and performs cell reselection through a backward target neighbor cell. The beneficial effect is that the channel interference degree is included in the reselection decision, which makes up for the limitation of taking only the reference signal received power as the reselection basis, and the reselection trigger condition can be dynamically adjusted; when the service cell signal and interference plus noise ratio deteriorates but the reference signal received power does not reach the traditional reselection threshold, the reselection can be triggered in time, the terminal can quickly escape from the interference cell, the probability of physical downlink control channel analysis error and paging loss is reduced, and the communication stability under a complex interference network is improved.

Description

Technical Field

[0001] This invention relates to the field of computer equipment technology, and in particular to a method for fast cell reselection in 5G terminals and a 5G terminal. Background Technology

[0002] In the existing wireless network environment, signal interference exists between different wireless cells and different frequencies, which may lead to a decrease in signal quality in some cells or in certain directions within a cell. The serving cell where 5G terminals are located is susceptible to signal quality degradation due to interference from wireless channels and neighboring cell signals.

[0003] In existing technologies, the radio resource control layer of the baseband processor typically uses the 3GPP (3rd Generation Partnership Project) protocol, with the serving cell's reference signal received power and the network configuration's reselection threshold as the basis for cell selection and reselection. However, in complex network environments with interference, when the serving cell's reference signal received power has not yet decreased to the network configuration's reselection threshold, the signal-to-interference-plus-noise ratio (SNR) of that serving cell may have already severely deteriorated. This can lead to poor downlink received signal quality at the terminal, probabilistic downlink physical control channel parsing errors, lost paging messages, and other issues, posing a risk of missing network-side messages. In such scenarios, a reselection mechanism based solely on reference signal received power cannot drive the terminal to promptly leave cells with poor SNR, making it difficult to guarantee the terminal's communication reliability in interference environments. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a fast cell reselection method for 5G terminals, applicable to 5G terminals containing an application processor and a baseband processor. The method includes the following steps: Step S1: The application processor continuously acquires the signal-to-interference-plus-noise ratio of the serving cell, which is measured and reported by the baseband processor. Step S2: When the application processor determines that the 5G terminal meets the fast reselection condition based on the signal-to-interference-plus-noise ratio, the application processor configures a reselection trigger difference threshold for the baseband processor. Step S3: The baseband processor performs a neighbor cell reselection determination based on the reselection trigger difference threshold, and performs cell reselection to the target neighbor cell when the determination passes.

[0005] Preferably, step S2 includes: Whenever the acquired signal-to-interference-plus-noise ratio falls below a first threshold, the application processor increments the count value of the anomaly counter. When the count value is greater than the second threshold, the 5G terminal is determined to meet the fast reselection condition; When the count value is not greater than the second threshold, it is determined that the 5G terminal does not meet the fast reselection condition.

[0006] Preferably, step S2 further includes: Whenever the acquired signal-to-interference-plus-noise ratio is not lower than the first threshold, the application processor resets the count value of the anomaly counter to zero.

[0007] Preferably, step S2 further includes: When it is determined that the 5G terminal does not meet the fast reselection conditions, the application processor configures the reselection trigger difference threshold to the baseband processor, and the reselection trigger difference threshold is an invalid value.

[0008] Preferably, in step S2, the application processor sends the reselection trigger difference threshold to the radio resource control layer of the baseband processor via control instructions.

[0009] Preferably, the neighboring cells include co-frequency measurement neighboring cells and / or inter-frequency measurement neighboring cells; in step S3, the baseband processor performs a neighboring cell reselection determination based on the reselection trigger difference threshold, including: The baseband processor acquires the reference signal received power of the neighboring cell and the reference signal received power of the serving cell; The decision is passed when the difference between the reference signal received power of the neighboring cell and the reference signal received power of the serving cell is greater than the reselection trigger difference threshold.

[0010] Preferably, the cell reselection to the target neighboring cell includes: When there are multiple neighboring cells that meet the reselection conditions, the baseband processor determines the neighboring cell with the highest reference signal received power as the target neighboring cell and performs cell reselection on the target neighboring cell.

[0011] The present invention also provides a 5G terminal, including an application processor, a baseband processor, and a memory storing a computer program. When the application processor and the baseband processor call and execute the computer program, they are used to implement the 5G terminal cell fast reselection method as described above.

[0012] The above technical solution has the following advantages or beneficial effects: By obtaining the signal-to-interference-plus-noise ratio (SNR) of the serving cell and determining the fast reselection conditions through the application processor, the actual interference level of the channel is incorporated into the reselection decision, overcoming the limitation of existing technologies that only use the reference signal received power as the basis for reselection judgment; the application processor configures the reselection trigger difference threshold to the baseband processor, which can dynamically adjust the reselection trigger conditions according to the interference scenario; the baseband processor performs neighbor cell reselection judgment based on the difference threshold, which can promptly trigger reselection and switch to the target neighbor cell in scenarios where the SNR of the serving cell deteriorates but the reference signal received power has not yet reached the traditional reselection threshold, enabling the terminal to quickly escape from the severely interfered cell, effectively reducing the probability of missed messages such as downlink physical downlink control channel parsing errors and paging loss, and improving communication stability under complex interference networks. Attached Figure Description

[0013] Figure 1 This is a flowchart illustrating a fast cell reselection method for 5G terminals according to an embodiment of the present invention. Figure 2 This is a schematic diagram illustrating the strategy and control flow of a fast cell reselection method for 5G terminals according to an embodiment of the present invention. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within the scope of the present invention.

[0015] In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a fast cell reselection method for 5G terminals is provided, applicable to 5G terminals including application processors and baseband processors, such as... Figure 1 As shown, the method includes the following steps: Step S1: The application processor obtains the signal-to-interference-plus-noise ratio of the serving cell, which is measured and reported by the baseband processor. Step S2: When the application processor determines that the 5G terminal meets the fast reselection condition based on the signal-to-interference-plus-noise ratio, the application processor configures the reselection trigger difference threshold to the baseband processor. Step S3: The baseband processor performs a neighbor cell reselection determination based on the reselection trigger difference threshold, and performs cell reselection to the target neighbor cell when the determination is successful.

[0016] Specifically, in this embodiment, after the 5G terminal powers on and successfully camps on the current serving cell, the baseband processor continuously measures the wireless channel and neighboring cell signals at the physical layer (PHY). Its underlying communication entities operate in accordance with 3GPP protocol specifications 38.331, 38.321, 38.213, and 38.212. The application processor, acting as the terminal's master control unit (AP), periodically or dynamically extracts the signal-to-interference-plus-noise ratio (SINR) of the current serving cell from the baseband processor (CP or Modem) through an internal inter-processor communication mechanism. The application processor operates with independent monitoring and control strategies, rapidly and objectively assessing the current channel interference level based on the extracted SINR. When the assessment confirms severe network interference and meets preset fast reselection conditions, the application processor generates a reselection trigger difference threshold (rsrpTh) to accelerate or relax the reselection threshold and sends this threshold to the baseband processor for configuration. Based on the original standard cell reselection algorithm, the baseband processor introduces the cell reselection trigger difference threshold as a new cell reselection decision input to determine the reselection of surrounding neighboring cells. Once a neighboring cell meets the conditions adjusted due to the introduction of the threshold, the determination is passed, and the baseband processor then controls the terminal device to quickly disconnect from the current inferior serving cell and perform cell reselection operation to the selected target neighboring cell.

[0017] This embodiment establishes an independent network environment identification and reselection intervention strategy on the application processor side, enabling the terminal to be sensitively identified and flexibly controlled by the application processor to accelerate the departure from bad cells in interference scenarios where the traditional reselection threshold based on the received reference signal power has not yet been triggered but the actual signal-to-noise ratio has been severely degraded. This fundamentally eliminates the hidden danger of missed messages caused by physical downlink control channel parsing failure or paging loss, and realizes cross-layer collaboration and flexible control of the processor.

[0018] In another preferred embodiment of the present invention, step S2 includes: when the signal-to-interference-plus-noise ratio is lower than a first threshold, the application processor increments the count value of the anomaly counter; When the count value is greater than the second threshold, the 5G terminal is determined to meet the fast reselection condition; when the count value is not greater than the second threshold, the 5G terminal is determined not to meet the fast reselection condition.

[0019] Step S2 further includes: when the signal-to-interference-plus-noise ratio is not lower than the first threshold, the application processor clears the count value of the exception counter to zero.

[0020] In addition, step S2 of the method further includes: when it is determined that the 5G terminal does not satisfy the fast reselection condition, the application processor configures the reselection trigger difference threshold to the baseband processor, and the reselection trigger difference threshold is an invalid value.

[0021] Specifically, in this embodiment, in conjunction with Figure 2 the control flowchart shown in the figure, the state transition and determination logic of the present solution are elaborated in detail. During the normal operation of the 5G terminal, the application processor maintains an abnormal counter (badCount) and a fast reselection flag (fastMode) internally. At the start of the process, the application processor performs initialization, resets the fast reselection flag to the normal mode, that is, sets fastMode=0. After that, the application processor (AP) periodically obtains the reference signal received power (RSRP) and signal to interference plus noise ratio (SINR) of the serving cell provided by the baseband processor through measurement report messages.

[0022] The application processor is preconfigured with two key filtering thresholds, which are respectively the first threshold for determining signal quality degradation (corresponding to Figure 2 the signal-to-noise ratio threshold th1 in the figure) and the second threshold for determining the continuous degradation period (corresponding to Figure 2 the period count threshold th2 in the figure). The application processor performs continuous comparison on the signal to interference plus noise ratio of the serving cell in step S2, that is, enters Figure 2 the SINR<th1 decision box in the figure: If the determination result is yes (Y), that is, it is detected that the signal to interference plus noise ratio of the current serving cell is lower than the preset first threshold th1, indicating that the current wireless channel begins to be significantly interfered by adjacent cell signals or frequencies, the application processor immediately performs an increment operation on the count value of the abnormal counter, corresponding to Figure 2 badCount++ in the figure; if the interference persists, causing the count value of the abnormal counter to accumulate continuously in consecutive determination periods, and finally enters the badCount>th2 decision box with a result of yes (Y), it indicates that the terminal is currently in a long-term, non-self-recoverable and substantially poor network environment, the application processor then makes a decision to determine that the 5G terminal satisfies the fast reselection condition, sets the fast reselection flag to be valid, that is, fastMode=1, and the reselection trigger difference threshold generated at this time is a valid value.

[0023] If the determination result is no (N), that is, during the monitoring process, the signal to interference plus noise ratio of the serving cell rises back to a level not lower than the first threshold th1, indicating that the previous decrease is only an instantaneous deep channel fading or short-term blockage, and the network environment has recovered by itself. In order to prevent the terminal from blind and frequent erroneous reselection, the application processor will immediately clear the count value of the abnormal counter, corresponding to Figure 2The badCount value is set to 0, thus resetting the cumulative period.

[0024] In a normal scenario where the error counter value is no greater than the second threshold th2 (i.e., the result of determining badCount > th2 is negative), the 5G terminal is determined to be in normal mode and does not meet the fast reselection condition, so fastMode = 0 is set. At this time, the application processor will proactively send a notification to the baseband processor, explicitly indicating that the current reselection trigger difference threshold rsrpTh is invalid, thereby instructing the baseband processor to continue performing normal reselection according to the default configuration of the standard protocol. Ultimately, as... Figure 2 As shown at the end of the process, the master application processor (AP) will uniformly send the reselection trigger difference threshold rsrpTh (valid or invalid value) calculated based on the above decision branch to the radio resource control layer (modemRRC) of the baseband processor.

[0025] It should be noted that in this embodiment, when the 5G terminal does not meet the fast reselection conditions, the application processor still configures the reselection trigger difference threshold in the form of an invalid value to the baseband processor, rather than issuing the threshold only when the fast reselection conditions are met. The core reason is that the application processor and the baseband processor need to maintain a continuous parameter synchronization mechanism: if the threshold is only issued when the fast reselection conditions are met and stops being issued when they are not met, the baseband processor will not be able to distinguish whether the reason for stopping the issuance is that the terminal does not meet the fast reselection conditions or that the communication link between the two is abnormally disconnected, resulting in ambiguity in the state judgment and easily causing reselection logic disorder. By adopting a unified configuration method throughout the entire cycle, it can ensure that the reselection judgment parameters on the baseband side are synchronized with the channel evaluation state of the application processor in real time, avoiding the retention of the valid threshold of the previous cycle and maintaining a loose reselection condition for a long time, thereby causing frequent reselection and ping-pong handover problems; it can also unify the interaction format and timing of cross-chip control instructions, simplify communication logic, reduce adaptation development costs, form a complete closed-loop control, and effectively improve the stability and reliability of cell reselection control in complex dynamic network scenarios.

[0026] This embodiment introduces an abnormal count increment and dynamic zeroing mechanism with dual threshold filtering, and maps it to... Figure 2 The complete closed-loop process shown can accurately identify short-term, occasional channel fluctuations and continuous, severe substantive interference. This ensures extremely high sensitivity in triggering rapid reselection under severe interference scenarios, while effectively avoiding frequent terminal reselection and the ping-pong effect caused by misjudgment. This greatly improves the stability and robustness of terminal reselection control decisions.

[0027] In another preferred embodiment of the present invention, step S2 includes: the application processor sending a reselection trigger difference threshold to the radio resource control layer of the baseband processor via control instructions.

[0028] Specifically, in this embodiment, when the application processor determines that the terminal is currently in an interference environment that meets the fast reselection conditions, the application processor encapsulates the calculated reselection trigger difference threshold (corresponding parameter rsrpTh) into a dedicated inter-chip adaptation control instruction. This control instruction is implemented at the underlying level based on an attention command control framework under a general asynchronous or synchronous master control communication architecture. The application processor sends this control instruction, containing the specific reselection trigger difference threshold value, across chips to the baseband processor via the terminal's internal inter-chip communication bus. Upon receiving the control instruction, the Radio Resource Control (RRC) layer entity running in the baseband processor's communication protocol stack performs software parsing and extracts the reselection trigger difference threshold value, thereby directly updating the dynamic variables in its internal reselection decision state machine.

[0029] This embodiment utilizes standard control commands to directly establish a command transmission path between the application processor located at the application layer and the wireless resource control layer of the baseband processor located at the underlying protocol stack. This enables lightweight interaction across chips and protocol layers without requiring destructive reconstruction of the underlying physical communication protocol architecture of the baseband chip, significantly reducing the commercial development cost of the solution and shortening the control latency.

[0030] In another preferred embodiment of the invention, the neighboring cells include same-frequency measurement neighboring cells and / or different-frequency measurement neighboring cells; In step S3, the baseband processor performs a neighbor cell reselection determination based on the reselection trigger difference threshold, including: the baseband processor obtains the reference signal received power of the neighbor cell and the reference signal received power of the serving cell; when the difference between the reference signal received power of the neighbor cell and the reference signal received power of the serving cell is greater than the reselection trigger difference threshold, the determination is successful.

[0031] Furthermore, performing cell reselection to the target neighbor cell includes: when there are multiple neighbor cells that meet the reselection conditions, the baseband processor determines the neighbor cell with the highest reference signal received power as the target neighbor cell and performs cell reselection to the target neighbor cell.

[0032] Specifically, in this embodiment, after the 5G terminal camps, the physical layer of the baseband processor continuously measures and reports intra-frequency measurement reports and inter-frequency measurement reports to the radio resource control layer. When the application processor issues a valid reselection trigger difference threshold, the baseband processor, during the neighbor cell reselection determination in step S3, extracts the reference signal received power of each surrounding neighboring cell (including intra-frequency and inter-frequency measurement neighboring cells) and the reference signal received power of the currently camped serving cell from the aforementioned intra-frequency and / or inter-frequency measurement reports. Then, the baseband processor uses its internal arithmetic logic unit to perform difference calculation; the specific mathematical formula for this determination is:

[0033] in, This represents the received power of the reference signal in any neighboring measurement cell. Indicates the reference signal received power of the current serving cell. This represents the reselection trigger difference threshold (corresponding to rsrpTh) issued by the application processor. When a measurement neighbor cell satisfies the above arithmetic difference being greater than the reselection trigger difference threshold, the reselection decision for that neighbor cell is considered successful.

[0034] In complex, high-interference scenarios, if multiple neighboring measurement cells (whether co-frequency or inter-frequency) satisfy the above calculation formula exist simultaneously, the baseband processor will sort all the qualified neighboring measurement cells according to their Reference Signal Received Power (RSRP) and lock the neighboring measurement cell with the largest RSRP and the strongest absolute signal strength as the final target neighboring cell. Subsequently, the radio resource control layer entity of the baseband processor will immediately initiate a cell reselection control procedure to the target neighboring cell to complete the rapid cell handover and reselection.

[0035] This embodiment introduces a dynamic determination formula based on the absolute difference in received power of the reference signal, completely overcoming the drawback of traditional technologies that require waiting for the serving cell signal to drop to an absolute low threshold before triggering a reselection. In special scenarios where the serving cell suffers from extremely poor signal-to-interference-plus-noise ratio due to interference, but its own received power of the reference signal remains relatively high, a reselection determination can be forcibly triggered as long as the relative power difference between the neighboring cell and the serving cell exceeds the reselection triggering difference threshold. Combined with the merging optimization strategy of selecting the strongest cell in a multi-neighboring cell scenario, this ensures that the terminal can access high-quality neighboring cells with no or weak interference as quickly as possible, completely solving the technical pain point of missing paging messages in interfering cells.

[0036] In another preferred embodiment of the present invention, a 5G terminal is included, comprising an application processor, a baseband processor, and a memory storing a computer program. When the application processor and the baseband processor call and execute the computer program, they are used to implement the 5G terminal cell fast reselection method as described in any of the foregoing embodiments.

[0037] Specifically, in this embodiment, the 5G terminal is supported by an underlying microelectronic hardware system, with computer programs permanently or dynamically loaded into its internal memory. When the 5G terminal is powered on, the application processor and the baseband processor respectively map and call the corresponding program segments in the memory. The application processor's program segment controls its internal general-purpose computing core, exception counter register, and dedicated bus controller to work together to achieve the timing of reading the signal-to-interference-plus-noise ratio, the dual threshold comparison and determination, and the encapsulation and distribution of control commands. The baseband processor's program segment controls the underlying radio frequency front-end, physical layer measurement pipeline, and radio resource control layer protocol stack to perform high-precision physical quantity measurement reporting, and efficiently executes the neighbor cell difference formula determination after receiving the reselection trigger difference threshold, until the radio frequency module completes cell reselection to the strongest target neighbor cell.

[0038] The highly integrated 5G terminal product provided in this embodiment, by solidifying the above-mentioned cross-layer optimization algorithm into a computer program that can be called collaboratively by multiple processors, achieves deep integration of hardware resources and software control strategies. While ensuring the universality of the terminal hardware architecture, it greatly empowers the terminal to autonomously and intelligently cope with harsh interference environments in complex mobile networks, significantly enhancing the product's commercial market competitiveness.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present invention.

Claims

1. A method for fast cell reselection in a 5G terminal, applied to a 5G terminal including an application processor and a baseband processor, characterized in that, The method includes the following steps: Step S1: The application processor continuously acquires the signal-to-interference-plus-noise ratio of the serving cell, which is measured and reported by the baseband processor. Step S2: When the application processor determines that the 5G terminal meets the fast reselection condition based on the signal-to-interference-plus-noise ratio, the application processor configures a reselection trigger difference threshold for the baseband processor. Step S3: The baseband processor performs a neighbor cell reselection determination based on the reselection trigger difference threshold, and performs cell reselection to the target neighbor cell when the determination passes.

2. The 5G terminal cell fast reselection method according to claim 1, characterized in that, Step S2 includes: Whenever the acquired signal-to-interference-plus-noise ratio falls below a first threshold, the application processor increments the count value of the anomaly counter. When the count value is greater than the second threshold, the 5G terminal is determined to meet the fast reselection condition; When the count value is not greater than the second threshold, it is determined that the 5G terminal does not meet the fast reselection condition.

3. The 5G terminal cell fast reselection method according to claim 2, characterized in that, Step S2 further includes: Whenever the acquired signal-to-interference-plus-noise ratio is not lower than the first threshold, the application processor resets the count value of the anomaly counter to zero.

4. The 5G terminal cell fast reselection method according to claim 2, characterized in that, Step S2 further includes: When it is determined that the 5G terminal does not meet the fast reselection conditions, the application processor configures the reselection trigger difference threshold to the baseband processor, and the reselection trigger difference threshold is an invalid value.

5. The 5G terminal cell fast reselection method according to claim 1, characterized in that, In step S2, the application processor sends the reselection trigger difference threshold to the radio resource control layer of the baseband processor via control instructions.

6. The 5G terminal cell fast reselection method according to claim 1, characterized in that, The neighboring cells include same-frequency measurement neighboring cells and / or different-frequency measurement neighboring cells; In step S3, the baseband processor performs a neighbor cell reselection determination based on the reselection trigger difference threshold, including: The baseband processor acquires the reference signal received power of the neighboring cell and the reference signal received power of the serving cell; The decision is passed when the difference between the reference signal received power of the neighboring cell and the reference signal received power of the serving cell is greater than the reselection trigger difference threshold.

7. The 5G terminal cell fast reselection method according to claim 6, characterized in that, The process of performing cell reselection to the target neighboring cell includes: When there are multiple neighboring cells that meet the reselection conditions, the baseband processor determines the neighboring cell with the highest reference signal received power as the target neighboring cell and performs cell reselection on the target neighboring cell.

8. A 5G terminal, comprising an application processor, a baseband processor, and a memory storing a computer program, characterized in that, When the application processor and the baseband processor call and execute the computer program, they are used to implement the 5G terminal cell fast reselection method as described in any one of claims 1 to 7.

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