Terminal, method for switching connection state to idle state thereof, program product and medium

Abstract

The invention relates to a terminal, a method for switching the terminal from a connection state to an idle state, a program product and a medium. When the terminal is in the RRC connection state, based on the RSRP value and the RSRQ value of each neighbor cell measured in the latest round, the strongest neighbor cell is judged, and MIB, SIB1 and SIB2 messages of the strongest neighbor cell are actively received; and on the basis of the SIB1, the RSRP and the RSRQ, storing the strongest neighbor cell of the registered PLMN and the equivalent PLMN list which are judged to meet the S criterion and of which the PLMN belongs to the terminal as an alternative resident cell. The method comprises the following steps: when an RRC connection release message is received, firstly judging whether the signal quality of an original service cell and each adjacent cell is higher than a threshold value or not, adding original service cell frequency points or different-frequency frequency points higher than the threshold value into a network searching frequency point list, and when the connection release message does not contain a redirection frequency point, sending the redirection frequency point to a network searching network; and trying to perform cell residence according to the sequence of the original service cell, the alternative residence cell and the search network frequency point list. According to the invention, time consumption and power consumption introduced by network searching when the terminal is switched from the RRC connection state to the RRC idle state can be greatly reduced, so that rapid and low-power-consumption residence is realized.

Description

Technical Field

[0001] This application relates to the field of mobile communication technology, and more specifically, to a terminal and its method, program product and medium for transitioning from a connected state to an idle state. Background Technology

[0002] With the rapid development of underlying technologies and new applications, wireless access technology has been widely adopted. In practical applications, to improve the utilization of wireless resources, after a service ends, the network sends an RRC connection release message to the terminal. Upon receiving the message, the terminal needs to transition from the RRC connected state to the RRC idle state. During this process, the terminal needs to select a suitable cell to camp on and enter the RRC idle state to listen for network paging and respond to user requests to establish new links.

[0003] In mobile communication systems, the transition from RRC connected state to RRC idle state by a terminal presents significant problems. Firstly, if the transition is lengthy, the terminal cannot promptly listen for and respond to network paging. Taking voice calls as an example, if the terminal's response delay is too large when the network notifies it of an incoming call via paging, it will degrade the caller's experience. In extreme cases, the terminal may even miss the paging, resulting in a busy tone or call failure message for the caller, severely impacting user experience. Secondly, when a user needs to initiate a new call or data transmission after the terminal exits connected state, if the terminal's cell dwell time is too long, it will be unable to respond to the user's request in a timely manner, causing service delays.

[0004] Therefore, the RRC state fast transition strategy is particularly important, and there is currently no existing technical solution that can quickly and with low power consumption complete cell camping during the transition of the terminal from connected state to idle state. Summary of the Invention

[0005] This application is provided to address the aforementioned problems existing in the prior art. The terminal, method, program product, and medium for transitioning from a connected state to an idle state according to embodiments of this application enable the terminal to not only effectively reduce power consumption during network search and dwell during the transition from an RRC connected state to an RRC idle state, but also achieve rapid transition from a connected state to an idle state. This improves the terminal's efficiency in monitoring network paging and allows for timely response to user requests to establish new links, significantly optimizing the user experience.

[0006] According to a first aspect of this application, a method for a terminal to transition from a connected state to an idle state is provided, comprising: when the terminal is in an RRC connected state, determining the strongest neighbor cell among the neighbor cells based on the RSRP and RSRQ values ​​of each neighbor cell obtained in the latest round of measurement, and actively receiving the system message of the strongest neighbor cell, the system message including MIB, SIB1, and SIB2 messages; based on the received SIB1 system message of the strongest neighbor cell, the RSRP and RSRQ values ​​measured in the RRC connected state, determining whether the strongest neighbor cell meets the camping conditions, saving the strongest neighbor cell that meets the camping conditions as a candidate camping cell, and saving the system message of the candidate camping cell together, wherein meeting the camping conditions includes satisfying the S criterion, and the PLMN of the strongest neighbor cell belonging to the terminal's registered PLMN and equivalent PLMN list; when the terminal receives Upon receiving an RRC connection release message from the network, the following operations are performed: The signal quality of the original serving cell and each neighboring cell is determined to be higher than a threshold. Frequency points of the original serving cell or other frequency points with signal quality higher than the threshold are added to the network search frequency list. Signal quality higher than the threshold includes measured RSRP values ​​higher than a specified threshold P and RSRQ values ​​higher than a specified threshold Q. If the RRC connection release message does not contain redirected frequency points, after completing the underlying release, an attempt is made to directly camp on the original serving cell. If camping on the original serving cell fails, and the terminal has backup camping cells saved, an attempt is made to camp on the backup camping cell. If camping on the backup camping cell fails, and the network search frequency list contains original serving cell frequency points or other frequency points, a suitable camping cell is searched based on the network search frequency list for camping.

[0007] According to a second aspect of this application, a wireless communication terminal is provided, the wireless communication terminal including at least a processor, the processor being configured to perform the steps of the method for a terminal to transition from a connected state to an idle state as described in various embodiments of this application.

[0008] According to a third aspect of this application, a computer program product is provided, including a computer program / instructions that, when executed by a processor, implement the steps of the method for a terminal to transition from a connected state to an idle state as described in various embodiments of this application.

[0009] According to a fourth aspect of this application, a non-transitory computer-readable storage medium is provided, on which computer-executable instructions are stored, which, when executed by a processor, implement the steps of the method for a terminal to transition from a connected state to an idle state as described in various embodiments of this application.

[0010] According to the various embodiments of this application, the terminal and its method, program product and medium for transitioning from connected state to idle state utilize the measurement of neighboring cells when the terminal is in RRC connected state to determine the strongest neighboring cell among the neighboring cells, actively receive the system message of the strongest neighboring cell, and, if it is further determined that it meets the camping conditions, use it as a candidate camping cell. When the terminal receives an RRC connection release message from the network, it generates a network search frequency list based on the signal quality of the original serving cell and each neighboring cell. If attempting to directly camp on the original serving cell fails, it does not need to immediately switch to a large-scale frequency list or a full-band search. Instead, it can first try camping on a candidate cell that meets the camping conditions and was saved during the connected state. Furthermore, if camping on a candidate cell fails, it can further search for a suitable cell within a smaller range of the network search frequency list. In other words, when attempting to camp on a cell, it adopts a strategy from directly camping on the original serving cell / candidate cell to a smaller-scale network search. This achieves a higher camping success rate and completes cell camping in a shorter time, greatly reducing the time and power consumption introduced by the large-scale network search when the terminal transitions from the RRC connected state to the RRC idle state. This enables fast and low-power camping, improves the terminal's listening efficiency for network paging, avoids service delays or missing responses to user requests to establish new links, and significantly improves the user experience. Attached Figure Description

[0011] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings illustrate various embodiments generally by way of example rather than limitation, and are used, together with the description and claims, to explain the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0012] Figure 1 This diagram illustrates a typical network search method in the prior art for a terminal to transition from a connected state to an idle state.

[0013] Figure 2 A flowchart illustrating a method for a terminal to transition from a connected state to an idle state according to an embodiment of this application is shown.

[0014] Figure 3 A schematic diagram of the terminal network search process according to an embodiment of this application is shown.

[0015] Figure 4 A schematic diagram illustrating the specific steps of attempting cell dwell according to an embodiment of this application. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions of this application, the application will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific examples, but these are not intended to limit the scope of this application.

[0017] The terms "first," "second," and similar words used in this application do not indicate any order, quantity, or importance, but are merely used for distinction. The terms "including" or "comprising," etc., used in this application mean that the element preceding the word encompasses the elements listed after the word, and do not exclude the possibility of encompassing other elements. In this application, the arrows shown in the figures for each step are merely examples of the execution order, not limitations. The technical solution of this application is not limited to the execution order described in the embodiments. The steps in the execution order can be combined, broken down, or rearranged, as long as the logical relationship of the executed content is not affected.

[0018] All terms used in this application (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein. Technologies and equipment known to one of ordinary skill in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0019] In this application, the arrows shown in the figures for each step are merely examples of the execution order and not limitations. The technical solution of this application is not limited to the execution order described in the embodiments. The steps in the execution order can be combined, decomposed, or their order can be changed, as long as the logical relationship of the execution content is not affected.

[0020] In cellular networks such as 4G LTE, 5G NR, and 3G UMTS, radio resources (such as spectrum and scheduling resources) are limited. When a user equipment (UE) completes data transmission or has no service for an extended period, maintaining a dedicated connection leads to resource waste. Releasing the connection allows the terminal to enter an idle state, enabling the network to reclaim resources and allocate them to other active users, thereby improving overall network resource utilization. Furthermore, in the RRC connected state (RRC_CONNECTED, referring to the state where a mobile terminal or other device has established a stable radio connection with a network base station, allowing the transmission of control information and user data), the terminal needs to continuously listen to the control channel and maintain the link, resulting in high power consumption. However, by selecting a suitable cell and switching to the RRC idle state (RRC_IDLE, referring to the state where the terminal has not established a radio connection with a network base station), the terminal can periodically wake up within the chosen cell using the discontinuous reception (DRX) mechanism, significantly reducing power consumption and extending battery life. It can also quickly switch back to the RRC connected state or other states when needed. The selection of the suitable cell for the terminal in the RRC idle state is a crucial step in this process.

[0021] Figure 1 This diagram illustrates a typical network search method in the prior art for a terminal to transition from a connected state to an idle state.

[0022] like Figure 1 As shown, in the prior art, the strategy for selecting a target cell for a terminal during the transition from RRC connected state to RRC idle state typically includes the following steps:

[0023] First, when the terminal's RRC (Radio Resource Control) receives the network's connection release message, it will release the underlying L2 (data link layer) and L1 (physical layer).

[0024] After releasing the underlying layer, a frequency point, partial frequency band, or full frequency band search is performed. In some cases, a list of frequency points / bands can be provided initially. If no suitable cell is found, the system usually switches directly to a full-band search, which greatly increases the search and dwell time. During this process, the terminal's power consumption is also relatively high. Furthermore, when dwelling on a newly discovered cell, the system needs to receive new system messages from that cell, including MIB, SIB1, and SIB2, all of which increase the cell dwell time. Excessive network search dwell time may cause the terminal to be unable to respond to the user's call and data transmission needs in a timely manner, or even miss paging, resulting in the caller hearing a busy tone or call failure message, which greatly affects the user experience.

[0025] Figure 2A flowchart illustrating a method for a terminal to transition from a connected state to an idle state according to an embodiment of this application is shown.

[0026] like Figure 2 As shown, in step 21, when the terminal is in RRC connected state, it determines the strongest neighbor cell among the neighbor cells based on the RSRP and RSRQ values ​​of each neighbor cell obtained in the latest round of measurement, and actively receives the system message of the strongest neighbor cell. The system message includes MIB (cell system message), SIB1 (cell system message 1), and SIB2 (cell system message 2).

[0027] In some embodiments, the strongest neighboring cell among all neighboring cells can be determined as follows: First, in this round of neighboring cell measurement, once it is determined that the RSRP value of the currently measured neighboring cell is higher than a specified threshold P, and at the same time, the RSRQ value is also higher than a specified threshold Q, then the corresponding first timer is started for that neighboring cell. As long as the RSRP value and RSRQ value remain higher than the corresponding threshold, the first timer continues to count down. When either the RSRP value or the RSRQ value fails to meet the condition of being higher than the corresponding threshold, the first timer will stop counting down. In one round of measurement, the first timers of multiple neighboring cells may run simultaneously. When one of the first timers exceeds its timing duration, all other first timers are stopped, and the neighboring cell corresponding to the first timer that expired is identified as the strongest neighboring cell. In some embodiments, the first timer may be a time-length timer customized by the terminal manufacturer, and the specific timing duration can be adjusted according to performance requirements. As an example, in high-speed movement scenarios (such as high-speed rail and highways), the timing duration can be set shorter to accommodate rapid signal changes caused by high-speed movement and to quickly respond to changes in neighboring cell quality. In low-speed movement scenarios (such as walking and indoors), the timing duration can be set longer because the signal is relatively stable in low-speed scenarios, tolerating a longer evaluation time to ensure that the truly stable strongest neighboring cell is selected, thus improving the success rate of subsequent cell dwell. Furthermore, after a new round of neighboring cell measurements, the newly obtained strongest neighboring cell replaces the strongest neighboring cell from the previous round, thereby ensuring that the strongest neighboring cell represents the latest neighboring cell whose signal meets the requirements.

[0028] In some embodiments, receiving system messages from the strongest neighboring cell can be cleverly achieved by utilizing the idle time of the connected state or by receiving with multiple antennas, without affecting normal network service data transmission. The specific process can be performed according to steps 211-214 below.

[0029] First, in step 211, the terminal receives synchronization signals PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal) around the center frequency point. The PSS determines the 5ms time slot boundary, and the SSS is combined to determine the 10ms frame boundary and cell ID, thereby achieving frame synchronization with the base station.

[0030] Then in step 212, after frame synchronization is completed, the PBCH is received and MIB information is obtained from it, including the system frame number, system bandwidth, and PBCH configuration.

[0031] In step 213, after receiving the MIB, the terminal knows the time-frequency resources of the PCFICH, can receive and parse the PCFICH, and obtain the number of symbols of the PDCCH. It then searches for candidate PDCCHs sent to SI-RNTI in the common search space of the PDCCH channel domain. According to the PDCCH indication, the UE receives the PDSCH on the corresponding time-frequency resources and decodes it to obtain the SIB1 message.

[0032] In step 214, the transmission period of SIB2 is determined based on the scheduling information (schedulingInfoList) in SIB1. SIB1 specifies the transmission periods and other scheduling information for all other SIBs. The transmission timing of SIB2 is calculated based on parameters such as the SI periodicity and SI window length configured in SIB1. After determining the transmission timing, starting from the SI window, the terminal uses SI-RNTI to receive DL-SCH and continues receiving until the SI window ends or the SIB2 message is received.

[0033] Then, in step 22, based on the received SIB1 system message of the strongest neighbor cell, the RSRP (Reference Signal Receiving Power) value and RSRQ (Reference Signal Receiving Quality) value measured in the RRC connected state, it is determined whether the strongest neighbor cell meets the camping conditions. The strongest neighbor cell that meets the camping conditions is saved as a candidate camping cell, and the system message of the candidate camping cell is also saved. The camping conditions include satisfying the S criterion, and the PLMN of the strongest neighbor cell belongs to the terminal's registered PLMN and equivalent PLMN list.

[0034] An equivalent public land mobile network (PLMN) is a list of PLMNs that are equivalent to each other. It serves as the basis for terminals to determine whether a PLMN is equivalent to a registered PLMN and an equivalent PLMN during cell selection, cell reselection, and other scenarios. A terminal can only camp on the strongest neighbor cell if its PLMN is included in both its registered and equivalent PLMN lists.

[0035] The above-mentioned S criterion is the cell selection criterion specified in the 3GPP TS 36.304 protocol, which requires that Srxlev > 0 and Squal > 0 simultaneously. Here, Srxlev (Cell selection RX level value) represents the cell selection received level value in decibels (dB), and Squal (Cell selection quality value) represents the cell selection quality value in decibels (dB). The calculation methods for Srxlev and Squal are as follows: (1-1)-(1-3):

[0036] Srxlev= Q rxlevmeas - (Q rxlevmin + Q rxlevminoffset Pcompensation (1-1)

[0037] Squal = Q qualmeas - (Q qualmin + Q qualminoffset (1-2)

[0038] Pcompensation = max(P EMAX -P PowerClass , 0) (1-3)

[0039] Among them, Q rxlevmeas (Measured cell RX level value) represents the received signal level value measured by the terminal, reflecting the actual strength of the cell signal received by the terminal. In this embodiment, the RSRP value measured in RRC connected state is actually used; Q rxlevmin (Minimum required RX level in the cell) represents the minimum received signal level required by the cell, corresponding to the parameter q-RxLevMin in the SIB1 system message; Q rxlevminoffset That is Q rxlevmeas The offset corresponds to the parameter q-RxLevMinOffset in the SIB1 system message; P EMAXThis indicates the maximum transmit power allowed when a terminal accesses the cell, as configured by the system, corresponding to the parameter p-Max in the SIB1 system message; P PowerClass The maximum output power is determined by the terminal category. Power Class 2 has a maximum output power of 26dBm, applicable only to specific operating frequency bands, while Power Class 3 has a maximum output power of 23dBm, applicable to all frequency bands. In practical applications, the maximum output power can be set as needed; this application does not impose specific restrictions on this. Q qualmeas (Measured cell quality value) represents the cell signal quality value measured by the terminal, reflecting the quality of the cell signal received by the terminal. In this embodiment, the RSRQ value measured in RRC connected state is actually used; Q qualmin (Minimum required quality level in the cell) represents the minimum signal quality level required by the cell, corresponding to the parameter q-QualMin in the SIB1 system message; Q qualminoffset It is Q qualmin The offset corresponds to the parameter q-QualMinOffset in the SIB1 system message.

[0040] It can be seen that in the process of selecting a neighboring area as a candidate residential area, the latest measured data is always used and the screening criteria are relatively strict. This ensures that the selected residential area has a high success rate when attempting to stay as the target residential area.

[0041] Next, in step 23, if the terminal receives an RRC connection release message from the network, the following sub-steps 231-234 are executed.

[0042] In sub-step 231, it is determined whether the signal quality of the original serving cell and each neighboring cell is higher than the threshold. The original serving cell frequency points or inter-frequency points with signal quality higher than the threshold are added to the network search frequency point list. The signal quality higher than the threshold includes the measured RSRP value being higher than the specified threshold P and the RSRQ value being higher than the specified threshold Q.

[0043] In sub-step 232, if the RRC connection release message does not contain a redirected frequency point, the underlying L2 and L1 releases are completed first, and then an attempt is made to directly camp on the original serving cell.

[0044] It is worth noting that if the RRC connection release message received by the terminal from the network contains a redirected frequency point, then after completing the underlying release, the terminal should first attempt to search for the redirected frequency point and attempt to camp on the cell. Furthermore, if camping on any of the cells searched according to the redirected frequency point fails, the subsequent steps in this embodiment, starting from sub-step 232, should be executed. The specific steps for attempting to camp on each cell searched according to the redirected frequency point will be explained later. Figure 4 A detailed introduction will be provided.

[0045] In sub-step 233, if the terminal fails to stay in the original serving cell and has a backup serving cell saved, it attempts to stay in the backup serving cell.

[0046] In sub-step 234, if camping in the candidate cell fails and the search frequency list contains the original serving cell frequency or a different frequency, a suitable cell is searched for camping based on the search frequency list.

[0047] According to the method for a terminal transitioning from connected state to idle state according to embodiments of this application, the terminal periodically measures neighboring cells during the RRC connected state, particularly the RSRP and RSRQ values, to select the strongest neighboring cell with the best current signal quality. During periods of relatively idle service data transmission, without affecting normal network service data transmission, the terminal actively collects some system messages from this strongest neighboring cell at a very low cost, such as MIB, SIB1, and SIB2 messages. The collected system messages and measurement data are then used to further determine whether the strongest neighboring cell meets the cell camping conditions. If it does, it is saved as a candidate cell for camping. During the transition from the RRC connected state to the RRC idle state, this cell is used as a high-priority cell for attempted camping, avoiding the direct transition to a large-scale network search process due to unsuccessful camping in the original serving cell. This significantly shortens the network search time required for cell camping and reduces the power consumption generated during this process, achieving fast and low-power camping and improving the user experience.

[0048] In some embodiments, attempting to directly camp on the original serving cell may specifically include the following steps S1-S3:

[0049] S1. Based on the saved SIB1 system messages of the original serving cell, the RSRP value and RSRQ value measured in the RRC connected state, determine whether the original serving cell meets the camping conditions.

[0050] S2, if the original serving cell meets the camping conditions, perform the relevant configuration and paging configuration required for the camping cell based on the saved MIB system messages and SIB2 system messages of the original serving cell;

[0051] S3, the original serving cell successfully stayed, completing the transition from RRC connected state to RRC idle state.

[0052] As mentioned earlier, since the terminal attempts to find the strongest neighboring cell and determine whether it is suitable for camping in each round of neighboring cell measurement, it does not need to immediately switch to the network search process if it fails to camp in the original serving cell. Instead, it can first try to camp in the alternative cells, which may include the following steps SS1-SS3:

[0053] SS1, based on the saved SIB1 system messages of the candidate cell, the RSRP value and RSRQ value measured in the RRC connected state, determines whether the candidate cell meets the camping conditions;

[0054] SS2, if the candidate cell meets the camping conditions, perform the relevant configuration and paging configuration required for the camping cell based on the saved MIB system message and SIB2 system message of the candidate cell;

[0055] SS3, the alternative cell has successfully camped, completing the transition from RRC connected state to RRC idle state.

[0056] If the terminal fails to successfully register in the alternative community, it needs to switch to the network search process. Figure 3 A schematic diagram of the terminal network search process according to an embodiment of this application is shown.

[0057] like Figure 3 As shown, the terminal can first search for a suitable cell to camp on in the network frequency list. The specific steps are shown in steps 1-4.

[0058] In step 1, it is determined whether the search frequency list contains the original serving cell frequency.

[0059] Step 2: If the result of Step 1 is "yes", that is, if the original serving cell frequency is included in the network search frequency list, search for the original serving cell frequency and measure the RSRP and RSRQ values ​​of the cells searched on that frequency. Sort the searched cells based on the RSRP and RSRQ values ​​measured during the search, and attempt to camp on the cells according to the sorting results.

[0060] In some other embodiments, if the result of the determination in step 1 above is "no", proceed to step 3, in which it is further determined whether the search network frequency point list contains different frequency points.

[0061] If the result of step 3 is "yes", proceed to step 4. That is, if the original serving cell frequency is not included in the search frequency list but other frequency is included, search for the original serving cell frequency and other frequency, measure the RSRP value and RSRQ value of the cells searched on each frequency, sort the searched cells based on the RSRP value and RSRQ value measured during the search, and attempt to camp on the cells according to the sorting result.

[0062] As an example only, when sorting cells, they can be sorted, for example, based on the score value calculated according to the following formula (2):

[0063] Score = RSRP * α + RSRQ(1-α) (2)

[0064] Here, α is the weighting coefficient for RSRP and RSRQ. A larger weighting coefficient indicates higher importance of signal strength, which is suitable for applications such as rural or suburban areas with limited coverage, weak signals, but low interference. The specific value of the weighting coefficient can be set in the range of [0.5, 1]. In this case, RSRP value will dominate the ranking. A smaller weighting coefficient of α indicates greater emphasis on signal quality, suitable for scenarios with strong interference, such as densely populated cities where signals are strong but quality varies greatly. In this case, cells with better signal quality should be prioritized, thus reducing the value of the weighting coefficient, for example, setting it in the range of [0, 0.5], thereby increasing the influence of RSRQ value on cell ranking. The specific value of α can be set and adjusted according to actual conditions, and this application does not impose specific limitations on it.

[0065] In step 4, when searching for different frequency points, this application also searches for and includes the original serving cell's frequency points in the unified sorting. Therefore, if the signal quality of the original serving cell improves during the search, the user can directly camp on the original serving cell. Compared to searching for a new cell and attempting to camp on it, camping on the original serving cell does not require re-receiving system messages, including MIB, SIB1, and SIB2 (which takes approximately 200ms). The underlying configuration can be directly based on the received system messages to complete cell camping, without increasing unnecessary system message reception latency. This further reduces the time and power consumption required for cell camping, thereby improving the user experience.

[0066] In other cases, such as when the search frequency list does not contain either the original serving cell frequency (the result of step 1 is "No") or the inter-frequency frequency (the result of step 3 is also "No"), or when step 4 fails to find a suitable cell to camp on based on the original serving cell frequency and the inter-frequency frequency in the search frequency list, step 5 is entered. That is, the inter-frequency frequency dl-CarrierFreq in the interFreqCarrierFreqList of the system message SIB5 from the network is searched, and the inter-frequency frequency carrierFreq carried in the measObjectId in the rrcConnectionReconfiguration is measured. The RSRP value and RSRQ value of the cells searched on each frequency are measured. The searched cells are sorted based on the RSRP value and RSRQ value measured during the search, and cell camping is attempted according to the sorting result. Specifically, the score value of each cell can be calculated according to the aforementioned formula (2), and sorted from high to low score values, which will not be elaborated here.

[0067] In other embodiments, assuming that cell camping is still not successfully completed in step 5, then in step 6, the frequency band corresponding to the current operator will be further searched, and cell camping will be attempted based on the search results.

[0068] In other embodiments, if cell camping is not successfully completed in step 6, the process proceeds to step 7, where the list of frequency bands supported by the terminal is searched, with priority given to searching the frequency bands corresponding to the current operator, and cell camping is attempted based on the search results.

[0069] Figure 4 This diagram illustrates the specific steps of attempting cell camping according to an embodiment of this application. In steps 2, 4, 5, 6, or 7 above, cell camping is attempted based on the sorting result or the search result; alternatively, camping is attempted on each cell found based on the redirected frequency point search. This can be done according to... Figure 4 Proceed through steps i-iv as shown.

[0070] In step i, a MIB system message indicating an attempt to camp on a cell is received;

[0071] In step ii, the SIB1 system message of the cell to be camped is received, and based on the SIB1 system message, the RSRP value and RSRQ value measured during the search are used to determine whether the cell to be camped meets the camping conditions.

[0072] In step iii, if the cell to be camped meets the camping conditions, an SIB2 system message is received, and the relevant configurations and paging configurations required for the camping cell are performed according to the MIB system message and the SIB2 system message.

[0073] In step iv, the attempt to camp in the cell is successful, completing the transition from RRC connected state to RRC idle state.

[0074] According to embodiments of this application, a wireless communication terminal is also provided. The wireless communication terminal includes at least a processor configured to execute steps of the method for a terminal to transition from a connected state to an idle state as described in various embodiments of this application. The specific process has been described above in conjunction with... Figures 1-4 The details have been explained in detail, so I will not repeat them here.

[0075] According to embodiments of this application, a computer program product is also provided, including a computer program / instructions. When executed by a processor, the computer program / instructions implement the steps of the methods for transitioning a terminal from a connected state to an idle state as described in various embodiments of this application, as specifically illustrated above. Figures 1-4 The details have been explained in detail, so I will not repeat them here.

[0076] According to embodiments of this application, a non-transitory computer-readable storage medium is also provided, on which computer-executable instructions are stored, which, when executed by a processor, implement the steps of the method for a terminal to transition from a connected state to an idle state as described in various embodiments of this application.

[0077] According to the embodiments of this application, the terminal and its method, program product and medium for transitioning from connected state to idle state utilize cell measurement information of the terminal in RRC connected state to select and maintain alternative camping cells. Therefore, during the process of the terminal transitioning from RRC connected state to RRC idle state, it can effectively avoid direct frequency point search or large-scale frequency band and full bandwidth search, and can also save the time of newly receiving system messages of a newly searched cell. Therefore, it can greatly reduce the cell camping time of the terminal and significantly reduce the power consumption in this process.

[0078] In some embodiments, the aforementioned non-transitory computer-readable media may be, for example, read-only memory (ROM), random access memory (RAM), phase-change random access memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), electrically erasable programmable read-only memory (EEPROM), other types of random access memory (RAM), flash drives or other forms of flash memory, cache, registers, static memory, optical disc read-only memory (CD-ROM), digital versatile optical disc (DVD) or other optical storage, magnetic tape cassette or other magnetic storage devices, or any other possible non-transitory media used to store information or instructions that can be accessed by a computer device.

[0079] Furthermore, although exemplary embodiments have been described herein, their scope includes any and all embodiments based on this application that have equivalent elements, modifications, omissions, combinations (e.g., schemes where various embodiments overlap), adaptations, or changes. While several embodiments of wireless communication methods and wireless communication components have been described separately, it should be understood that the method details described in the wireless communication component description can also be incorporated into various embodiments of the wireless communication method, and vice versa.

[0080] The elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, the examples of which will be interpreted as non-exclusive. Therefore, this specification and the examples are intended to be considered merely illustrative, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0081] The order of the steps in this application is merely exemplary and not restrictive. The execution order of the steps can be adjusted without affecting the implementation of this application (without disrupting the logical relationship between the required steps), and the various embodiments obtained after the adjustment still fall within the scope of this application.

[0082] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments may be used by those skilled in the art upon reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the application. This should not be construed as an intention that a disclosed feature not claimed is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of a particular disclosed embodiment. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is an independent, separate embodiment, and these embodiments are contemplated to be combined with each other in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

Claims

1. A method for a terminal to transition from a connected state to an idle state, characterized in that, include: When the terminal is in RRC connection state, it determines the strongest neighbor cell among all neighbor cells based on the RSRP and RSRQ values ​​of each neighbor cell obtained in the latest round of measurement, and actively receives the system message of the strongest neighbor cell. The system message includes MIB, SIB1, and SIB2 messages. Based on the received SIB1 system message of the strongest neighbor cell, the RSRP value and RSRQ value measured in the RRC connected state, it is determined whether the strongest neighbor cell meets the camping conditions. The strongest neighbor cell that meets the camping conditions is saved as a candidate camping cell, and the system message of the candidate camping cell is also saved. The camping conditions include satisfying the S criterion and the PLMN of the strongest neighbor cell belonging to the terminal's registered PLMN and equivalent PLMN list. When the terminal receives an RRC connection release message from the network: Determine whether the signal quality of the original serving cell and each neighboring cell is higher than the threshold, and add the original serving cell frequency points or different frequency points with signal quality higher than the threshold to the network search frequency point list. Among them, the signal quality is higher than the threshold, including the measured RSRP value being higher than the specified threshold P and the RSRQ value being higher than the specified threshold Q. If the RRC connection release message does not contain a redirected frequency point, after completing the underlying release, it attempts to directly camp on the original serving cell; If the terminal fails to stay in the original serving cell, and the terminal has a backup serving cell saved, it will attempt to stay in the backup serving cell. If the candidate cell fails to be used for camping, and the network frequency list contains the original serving cell frequency or a different frequency, a suitable cell is searched for and camped on based on the network frequency list.

2. The method according to claim 1, characterized in that, The determination of the strongest neighbor among all neighboring regions specifically includes: If the measured RSRP value of a neighboring cell is higher than a specified threshold P and the RSRQ value is higher than a specified threshold Q, a corresponding first timer is started for that neighboring cell. The first timer stops timing when either the RSRP value is higher than the specified threshold P or the RSRQ value is higher than the specified threshold Q is not met. The neighboring cell corresponding to the first timer that times out first is designated as the strongest neighboring cell.

3. The method according to claim 1 or 2, characterized in that, The attempt to directly remain in the original service cell specifically includes the following steps: S1. Based on the saved SIB1 system messages of the original serving cell, the RSRP value and RSRQ value measured in the RRC connected state, determine whether the original serving cell meets the camping conditions. S2, if the original serving cell meets the camping conditions, perform the relevant configuration and paging configuration required for the camping cell based on the saved MIB system messages and SIB2 system messages of the original serving cell; S3, the original serving cell successfully stayed, completing the transition from RRC connected state to RRC idle state.

4. The method according to claim 1 or 2, characterized in that, The attempt to remain in the candidate residential area specifically includes the following steps: SS1, based on the saved SIB1 system messages of the candidate cell, the RSRP value and RSRQ value measured in the RRC connected state, determines whether the candidate cell meets the camping conditions; SS2, if the candidate cell meets the camping conditions, perform the relevant configuration and paging configuration required for the camping cell based on the saved MIB system message and SIB2 system message of the candidate cell; SS3, the alternative cell has successfully camped, completing the transition from RRC connected state to RRC idle state.

5. The method according to claim 1 or 2, characterized in that, The process of finding suitable cells for stationing based on the network frequency list specifically includes the following steps: Step 1: Determine whether the frequency point list contains the original serving cell frequency point; Step 2: If the original serving cell frequency is included in the search frequency list, search for the original serving cell frequency and measure the RSRP and RSRQ values ​​of the cells found on that frequency. Sort the found cells based on the RSRP and RSRQ values ​​measured during the search, and attempt to camp on the cells according to the sorting results.

6. The method according to claim 5, characterized in that, The step of finding suitable cells for stationing based on the network frequency list further includes the following steps: Step 3: If the original serving cell frequency is not included in the search frequency list, determine whether the search frequency list contains frequency points of different frequencies. Step 4: If the original serving cell frequency is not included in the frequency list but other frequency points are included, search for the original serving cell frequency and other frequency points, measure the RSRP value and RSRQ value of the cells searched on each frequency point, sort the searched cells based on the RSRP value and RSRQ value measured during the search, and attempt to camp on the cells according to the sorting results.

7. The method according to claim 6, characterized in that, The method further includes, if the original serving cell frequency and the different frequency do not exist in the network search frequency list, or if it fails to find a suitable cell to camp on based on the network search frequency list, the following steps are performed: Step 5: Search for inter-frequency points in the system message SIB5 and RRC connection state measurement configuration from the network, and measure the RSRP and RSRQ values ​​of the cells found on each frequency point. Sort the found cells based on the RSRP and RSRQ values ​​measured during the search, and attempt to camp on the cells according to the sorting results. Step 6: If cell registration fails in step 5, search for the frequency band corresponding to the current operator and attempt to register the cell based on the search results. Step 7: If cell camping is not successfully completed in step 6, search the list of frequency bands supported by the terminal, and prioritize searching the frequency band corresponding to the current operator, and attempt to camp the cell based on the search results.

8. The method according to any one of claims 5-7, characterized in that, In step 2, step 4, step 5, step 6, or step 7, attempting cell dwell based on the sorting or search results further includes: Step i: Receive the MIB system message indicating an attempt to camp on the cell; Step ii: Receive the SIB1 system message of the cell to be camped on, and determine whether the cell to be camped on meets the camping conditions based on the SIB1 system message, the RSRP value and RSRQ value measured during the search. Step iii: If the cell to be camped meets the camping conditions, receive the SIB2 system message, and perform the relevant configuration and paging configuration required for the cell to be camped based on the MIB system message and the SIB2 system message; Step iv: The attempt to camp in the cell was successful, completing the transition from RRC connected state to RRC idle state.

9. The method according to claim 1, characterized in that, The method further includes: if the RRC connection release message received by the terminal from the network contains a redirected frequency point, after completing the underlying release, prioritizing the search for the redirected frequency point and cell camping.

10. A wireless communication terminal, characterized in that, The wireless communication terminal includes at least: A processor configured to perform the steps of the method for a terminal to transition from a connected state to an idle state as described in claims 1-9.

11. A computer program product, comprising a computer program / instructions, characterized in that, When the computer program / instruction is executed by the processor, it implements the steps of the method for a terminal to transition from a connected state to an idle state as described in any one of claims 1-9.

12. A non-transitory computer-readable storage medium storing computer-executable instructions thereon, which, when executed by a processor, implement the steps of the method for a terminal to transition from a connected state to an idle state as described in any one of claims 1-9.

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