WO2024093744A1 - 小区选择方法及终端设备 - Google Patents

小区选择方法及终端设备 Download PDF

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Publication number
WO2024093744A1
WO2024093744A1 PCT/CN2023/126308 CN2023126308W WO2024093744A1 WO 2024093744 A1 WO2024093744 A1 WO 2024093744A1 CN 2023126308 W CN2023126308 W CN 2023126308W WO 2024093744 A1 WO2024093744 A1 WO 2024093744A1
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Prior art keywords
terminal device
cell
target
target cell
determines
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PCT/CN2023/126308
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English (en)
French (fr)
Inventor
僧书铭
李晨琬
陈磊
吴毅凌
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华为技术有限公司
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Publication of WO2024093744A1 publication Critical patent/WO2024093744A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the embodiments of the present application relate to the field of communication technology, and in particular, to a cell selection method and terminal equipment.
  • 5G fifth generation
  • more and more terminal devices need to connect to mobile networks.
  • a terminal device accesses the network, there are often multiple cells to choose from, so the terminal device needs to select a suitable cell from multiple cells for wireless network connection.
  • the terminal device needs to search for the cells and their corresponding power in the network environment where the terminal device is located, and then capture the cell with the best coverage in the network environment according to the search results, perform frame synchronization on the cell, and obtain the physical cell identity document (ID) of the cell.
  • the terminal device then reads the cell system message and measures the signal strength and signal quality of the cell to determine whether the cell meets the resident conditions.
  • the embodiments of the present application provide a cell selection method and terminal equipment, which reduce the capability requirements for the terminal equipment during the cell selection process.
  • an embodiment of the present application provides a cell selection method, which is applied to a terminal device, and the method includes: the terminal device obtains a target signal of a target cell; when the terminal device successfully obtains a target signals continuously, the terminal device determines that the target cell is a resident cell, a is a positive integer greater than a threshold value b, and the resident cell is a cell that meets the cell selection criteria of the terminal device; or when the number of target signals successfully obtained continuously by the terminal device is less than or equal to the threshold value b, the terminal device determines that the target cell is a non-resident cell, and the non-resident cell is a cell that does not meet the cell selection criteria of the terminal device.
  • the terminal device does not need to perform complex measurement calculations, but only needs to determine whether the target cell is a resident cell based on whether the number of target signals is greater than a threshold b. This reduces the processing capability requirements for the terminal device data and reduces the measurement overhead of the terminal device.
  • the steps are simple and flexible, and are suitable for terminal devices with low-complexity design and limited capabilities.
  • the terminal device successfully acquires a target signals continuously, including: the terminal device successfully acquires a target signals continuously within a time T1;
  • the number of target signals successfully acquired continuously by the terminal device is less than or equal to the threshold value b, including: the number of target signals successfully acquired continuously by the terminal device within time T1 is less than or equal to the threshold value b.
  • the terminal device may use the time when the target signal is searched as the starting time, and count the number of target signals successfully acquired continuously after the time;
  • the terminal may also periodically trigger the process of counting the number of consecutive successful acquisitions of target signals with j as a period, and j may be carried by the target signal or may be a preset parameter stored in the terminal.
  • the above method after the terminal device determines that the target cell is a non-residence cell, the above method also includes: when the number of target signals successfully acquired continuously within time T2 is greater than threshold c, the terminal device re-determines the target cell as a residency cell, and threshold c is greater than threshold b; or after the terminal device determines that the target cell is a non-residence cell, the above method also includes: the terminal device does not select the target cell as a residency cell within time T3.
  • the terminal device determines that the target cell is a non-residence cell
  • the terminal device restricts the selection of the target cell to be resided in, so as to avoid repeated monitoring of the target signal of the cell that does not meet the selection criteria in a short period of time.
  • the method further includes: In summary: when the number of target signals successfully acquired continuously within time T2 is greater than threshold c, the terminal device re-determines the target cell as a resident cell, and threshold c is less than threshold b.
  • the terminal device relaxes the requirements of the cell selection criteria, thereby preventing the terminal from always failing to search for a cell that meets the cell selection criteria.
  • the method further includes: if the first condition is met, the terminal device determines that the terminal device is in an abnormal working state, and the terminal device re-determines the resident cell.
  • the first condition includes at least one of the following: the number of times the terminal device fails to successfully receive the target signal continuously is greater than m; the number of times the terminal device determines that random access fails is greater than n; the number of times the terminal device determines that data transmission fails is greater than s; the terminal device determines that the block error rate of the data received within time T4 is greater than t.
  • the terminal device re-determines the resident cell including: the terminal device does not select the target cell as the resident cell within T3; or the terminal device can re-determine the target cell as the resident cell only when the number of target signals successfully acquired continuously within T2 is greater than a threshold value i, and the threshold value i is greater than a threshold value b.
  • the cell selection method provided in the embodiment of the present application when the terminal device re-determines the resident cell, adds some restrictions on the target cell to be re-determined as the resident cell within a certain period of time, thereby avoiding selecting the target cell that cannot meet the normal working requirements again within a short period of time.
  • the terminal device re-determines the resident cell including: when the number of target signals successfully acquired continuously within time T2 is greater than a threshold i, the terminal device re-determines the target cell as the resident cell, and the threshold i is less than a threshold b.
  • the terminal device when the terminal device re-determines the cell in which it can reside, the terminal device relaxes the requirements of the cell selection criteria, thereby preventing the terminal from always failing to search for a cell that meets the conditions of the cell selection criteria.
  • the target signal includes at least one of a beacon, a reference signal, a synchronization signal, a paging signal, downlink data, and a system message.
  • the target signal includes time T1, time T2, time T3, time T4, threshold b, threshold i and/or threshold c.
  • an embodiment of the present application provides a cell selection method, which is applied to a terminal device, and the method includes: the terminal device obtains a target signal of a target cell, and the target signal is used to generate a synchronization indication; when the first protocol layer of the terminal device successfully obtains d synchronization indications from the second protocol layer in succession, the terminal device determines that the target cell is a resident cell, d is a positive integer greater than a threshold value e, and the network layer of the terminal device includes a first protocol layer and a second protocol layer, and the first protocol layer is higher than the second protocol layer; or when the first protocol layer of the terminal device successfully obtains the number of synchronization indications from the second protocol layer in succession is less than or equal to the threshold value e, or when the first protocol layer of the terminal device successfully obtains the number of asynchronous indications from the second protocol layer in succession is greater than the threshold value e, the terminal device determines that the target cell is a non-resident cell, and a non-resident cell
  • the cell selection method provided in the embodiment of the present application enables the terminal device to determine whether the target cell is a resident cell based on whether the number of synchronization indications is greater than a threshold value d, thereby reducing the processing capability requirements for the terminal device data and the measurement overhead of the terminal device.
  • the steps are simple and flexible, and are suitable for terminal devices with low complexity design and limited capabilities.
  • the above method after the terminal device determines that the target cell is a non-residence cell, the above method also includes: when the number of synchronization indications from the second protocol layer that the first protocol layer of the terminal device successfully receives continuously within time T2 is greater than a threshold value f, the terminal device re-determines the target cell as a residency cell, and the threshold f is greater than a threshold value e; or after the terminal device determines that the target cell is a non-residence cell, the above method also includes: the terminal device does not select the target cell as a residency cell within time T3.
  • the cell selection method provided in the embodiment of the present application adds some restrictions on the target cell to be determined as a resident cell again within a certain period of time by the terminal device after the terminal device determines that the target cell is a non-resident cell, so as to avoid repeated monitoring of the target signal of the cell that does not meet the selection criteria within a short period of time.
  • the above method also includes: when the number of synchronization indications successfully obtained continuously by the first protocol layer from the second protocol layer is greater than a threshold value l, the terminal device re-determines the target cell as a residency cell, and the threshold value l is less than a threshold value e.
  • the terminal device relaxes the requirements of the cell selection criteria, thereby preventing the terminal from always failing to search for a cell that meets the cell selection criteria.
  • the method further includes: If the first condition is met, the terminal device determines that the terminal device is in an abnormal working state, and the terminal device re-determines a cell in which it can reside.
  • the first condition includes at least one of the following: the number of times the terminal device fails to successfully receive the target signal continuously is greater than m; the number of times the terminal device determines that the random access channel fails is greater than n; the number of times the terminal device determines that the data transmission fails is greater than s; the terminal device determines that the block error rate of the data received within time T4 is greater than t.
  • the terminal device re-determines the resident cell including: the terminal device does not select the target cell as the resident cell within T3; or the first protocol layer successfully obtains the number of synchronization indications from the second protocol layer continuously that is greater than the threshold i, the terminal device can re-determine the target cell as the resident cell, and the threshold i is greater than the threshold e.
  • the cell selection method provided in the embodiment of the present application when the terminal device re-determines the resident cell, adds some restrictions on the target cell to be re-determined as the resident cell within a certain period of time, thereby avoiding selecting the target cell that cannot meet the normal working requirements again within a short period of time.
  • the terminal device re-determines the resident cell including: when the number of target signals successfully acquired continuously within time T2 is greater than a threshold i, the terminal device re-determines the target cell as the resident cell, and the threshold i is less than a threshold e.
  • the terminal device when the terminal device re-determines the cell in which it can reside, the terminal device relaxes the requirements of the cell selection criteria, thereby preventing the terminal from always failing to search for a cell that meets the conditions of the cell selection criteria.
  • the target signal includes at least one of a beacon, a reference signal, a synchronization signal, a paging signal, a system message and downlink data.
  • the target signal includes time T2, time T3, time T4, threshold e and/or threshold f.
  • an embodiment of the present application provides a cell selection method, which is applied to a terminal device, and the method includes:
  • the terminal device obtains a target signal of the target cell; the terminal device determines a target cell selection value of the target cell according to the signal quality of the target signal; when the target cell selection value of the target cell is greater than zero, the terminal device determines that the target cell is a resident cell, which is a cell that meets the cell selection criteria of the terminal device; or when the target cell selection value of the target cell is less than or equal to zero, the terminal device determines that the target cell is a non-resident cell, which is a cell that does not meet the cell selection criteria of the terminal device.
  • the cell selection method provided in the embodiment of the present application can determine whether the target cell is a resident cell according to whether the target cell selection value is greater than zero, thereby reducing the measurement requirements of the terminal device, and the steps are simple and flexible, which is suitable for terminal devices with low complexity design and limited capabilities.
  • the target cell selection value of the target cell is the signal quality of the target signal minus a threshold g, where the threshold g is a minimum reception level of the terminal device.
  • the above method also includes: when the target cell selection value of the target cell is greater than a threshold h within time T2, the terminal device re-determines the target cell as a residency cell, and the threshold h is greater than zero; or after the terminal device determines that the target cell is a non-residence cell, the method also includes: the terminal device does not select the target cell as a residency cell within time T3.
  • the terminal device after the terminal device determines that the target cell is a non-residence cell, the terminal device adds some restrictions on the target cell to be re-determined as a residency cell within a certain period of time, thereby avoiding selecting the target cell that cannot meet normal working requirements again in a short period of time.
  • the method further includes: when the target cell selection value of the target cell is greater than a threshold w, the terminal device re-determines the target cell as a residency cell, and the threshold w is less than zero.
  • the terminal device relaxes the requirements of the cell selection criteria, thereby preventing the terminal from always failing to search for a cell that meets the cell selection criteria.
  • the method further includes: if the first condition is met, the terminal device determines that the terminal device is in an abnormal working state, and the terminal device re-determines the resident cell.
  • the first condition mentioned above includes: the number of times the terminal device fails to successfully receive the target signal continuously is greater than m; and/or the number of times the terminal device determines that the random access channel fails is greater than n; and/or the number of times the terminal device determines that the data transmission fails is greater than s; and/or the terminal device determines that the block error rate of the data acquired within time T4 is greater than t.
  • the terminal device re-determines the resident cell including: the terminal device does not select the target cell as the resident cell within T3; or when the target cell selection value of the target cell is greater than the threshold value i, the terminal device The target cell can be re-determined as a resident cell, and the threshold i is greater than the threshold e.
  • the cell selection method provided in the embodiment of the present application when the terminal device re-determines the resident cell, adds some restrictions on the target cell to be re-determined as the resident cell within a certain period of time, thereby avoiding selecting the target cell that cannot meet the normal working requirements again within a short period of time.
  • the terminal device re-determines the resident cell including: when the target cell selection value of the target cell is greater than a threshold value i, the terminal device re-determines the target cell as the resident cell, and the threshold value i is less than a threshold value e.
  • the terminal device when the terminal device re-determines the cell in which it can reside, the terminal device relaxes the requirements of the cell selection criteria, thereby preventing the terminal from always failing to search for a cell that meets the conditions of the cell selection criteria.
  • the target signal includes at least one of a beacon, a reference signal, a synchronization signal, a paging signal, a system message and downlink data.
  • the target signal includes time T2, time T3, time T4, threshold g and/or threshold h.
  • a communication device for implementing various methods.
  • the communication device may be a terminal device in the first aspect, the second aspect, or the third aspect, or a device included in the terminal device, such as a chip or a chip system; when the device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices.
  • the communication device includes a module, unit, or means corresponding to the implementation method, and the module, unit, or means can be implemented by hardware, software, or by hardware executing the corresponding software implementation.
  • the hardware or software includes one or more modules or units corresponding to the functions.
  • the communication device may include a processing module and a transceiver module.
  • the processing module may be used to implement the processing functions in any of the above aspects and any possible implementations thereof.
  • the transceiver module which may also be referred to as a transceiver unit, is used to implement the sending and/or receiving functions in any of the above aspects and any possible implementations thereof.
  • the transceiver module may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the transceiver module includes a sending module and/or a receiving module, which are respectively used to implement the sending or receiving function in any of the above aspects and any possible implementation methods thereof.
  • a communication device comprising: a processor and a communication interface; the communication interface is used to communicate with a module outside the communication device; the processor is used to execute a computer program or instruction so that the communication device executes the method described in any aspect.
  • the communication device can be a terminal device in the first aspect, the second aspect, or the third aspect, or a device included in the terminal device, such as a chip or a chip system; when the device is a chip system, it can be composed of a chip, or it can include a chip and other discrete devices.
  • a communication device comprising: at least one processor; the processor is used to execute a computer program or instruction stored in a memory, so that the communication device performs the method described in any aspect.
  • the memory may be coupled to the processor, or the memory may also exist independently of the processor, for example, the memory and the processor are two independent modules.
  • the memory may be located outside the communication device, or may be located inside the communication device.
  • the communication device may be a terminal device in the first aspect, the second aspect, or the third aspect, or a device included in the terminal device, such as a chip or a chip system.
  • a device included in the terminal device, such as a chip or a chip system.
  • the device When the device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices.
  • a computer-readable storage medium in which a computer program or instruction is stored, and when the computer-readable storage medium is run on a communication device, the communication device can execute the method described in any one of the aspects.
  • a computer program product comprising instructions, which, when executed on a communication device, enables the communication device to execute the method described in any one of the aspects.
  • the communication device provided in any one of the fourth to eighth aspects is a chip
  • the sending action/function of the communication device can be understood as output information
  • the receiving action/function of the communication device can be understood as input information
  • the technical effects brought about by any design method in the fourth to eighth aspects can refer to the technical effects brought about by different design methods in the first to third aspects, and will not be repeated here.
  • a communication system which includes the terminal device described in the above aspect and the access network device to which the target cell described in the above aspect belongs.
  • FIG1 is a schematic diagram of a process of selecting, inventorying and accessing a tag and a reader
  • FIG2 is a schematic diagram of a communication link between a reader and a tag in a distributed architecture provided by an embodiment of the present application
  • FIG3 is a schematic diagram of the structure of a communication system provided in an embodiment of the present application.
  • FIG4 is a schematic diagram of the structure of another communication system provided in an embodiment of the present application.
  • FIG5 is a schematic diagram of a flow chart of a cell selection method provided in an embodiment of the present application.
  • FIG6 is a schematic diagram of a scenario in which a terminal device acquires a target signal according to an embodiment of the present application
  • FIG7 is a schematic diagram of a flow chart of another cell selection method provided in an embodiment of the present application.
  • FIG8 is a schematic diagram of a flow chart of another cell selection method provided in an embodiment of the present application.
  • FIG9 is a schematic diagram of a flow chart of another cell selection method provided in an embodiment of the present application.
  • FIG10 is a schematic diagram of a flow chart of another cell selection method provided in an embodiment of the present application.
  • FIG11 is a schematic diagram of a tag coverage scenario provided in an embodiment of the present application.
  • FIG12 is a schematic diagram of a flow chart of another cell selection method provided in an embodiment of the present application.
  • FIG13 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application.
  • FIG. 14 is a schematic diagram of the structure of another terminal device provided in an embodiment of the present application.
  • plural means two or more than two.
  • At least one of the following or similar expressions refers to any combination of these items, including any combination of single items or plural items.
  • at least one of a, b, or c can mean: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.
  • words such as “first” and “second” are used to distinguish the same items or similar items with substantially the same functions and effects. Those skilled in the art can understand that words such as “first” and “second” do not limit the quantity and execution order, and words such as “first” and “second” do not necessarily limit them to be different.
  • words such as “exemplary” or “for example” are used to indicate examples, illustrations or descriptions. Any embodiment or design described as “exemplary” or “for example” in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as “exemplary” or “for example” is intended to present related concepts in a concrete way for easy understanding.
  • radio-frequency identification (RFID) technology First, radio-frequency identification (RFID) technology:
  • the RFID technology is a contactless automatic identification technology.
  • the RFID system usually includes a reader/interrogator and a tag. Through the information exchange between the reader/interrogator and the tag, the reader/interrogator can manage the tag.
  • the reader can perform operations such as selection, inventory, and access on tags.
  • the selection operation is used to select one or a group of tags for inventory and access.
  • the inventory operation can be understood as the process of the reader identifying the tag.
  • the access operation can be understood as the process of the reader interacting with the tag.
  • the tag needs to be identified by the reader before access.
  • FIG. 1 the process of selecting, inventorying, and accessing tags by a reader/writer may be shown in FIG1. Referring to FIG1, the process includes the following steps:
  • the reader sends a select command to the tag.
  • the reader sends a select command to the tag, which can be used to select one or a group of tags.
  • the select command may include memory information, and the tag whose data stored in the storage area indicated by the memory information is consistent with the Mask value is the tag selected by the select command.
  • the reader sends a query (Query) command/query adjustment (QueryAdjust) command/query representative (QueryRep) command to the tag.
  • the reader sends a Query command/QueryAdjust command/QueryRep command to the tag.
  • the inventory access is performed in a time-division multiplexing manner, that is, after the reader ends the inventory access to one tag, it starts the inventory access to the next tag.
  • the following steps are described using the inventory access to one tag as an example.
  • Step 101-step 102 can be understood as the selection operation of the reader on the tag. After the selection operation is completed, the reader can perform the following inventory operation on the tag.
  • the tag sends RN16 to the reader.
  • the tag When the slot counter started by the tag is 0, in response to the command sent by the reader/writer, the tag sends a 16-bit random number (RN16) to the reader/writer.
  • RN16 16-bit random number
  • the tag when the time slot counter started by the tag is not 0, the tag will not send RN16 to the reader.
  • the reader sends a confirmation message to the tag.
  • the reader If the reader successfully receives the RN16 sent by the tag, the reader sends an acknowledgment (ACK) message to the tag, which includes the random number RN16.
  • ACK acknowledgment
  • the tag sends the electronic product code (EPC) to the reader.
  • EPC electronic product code
  • the tag After receiving the confirmation message sent by the reader/writer, if the random number RN16 carried in the confirmation message matches the random number RN16 sent in step 103, the tag sends the product electronic code to the reader/writer.
  • Steps 103 to 105 can be understood as the inventory operation of the reader on the tag. After the inventory operation is completed, the reader can perform the following access operations on the tag:
  • the reader sends a Req_RN command to the tag.
  • the reader sends a Req_RN instruction to the tag, and the Req_RN instruction includes the same RN16 as in the above steps.
  • the tag sends handle information to the reader.
  • the tag After receiving the Req_RN including RN16 sent by the reader, if the RN16 sent by the reader is consistent with or matches the RN16 previously generated by the tag, the tag sends handle information to the reader.
  • the tag when the RN16 sent by the reader is inconsistent with or does not match the RN16 previously generated by the tag, the tag does not feed back handle information to the reader.
  • the reader sends an access command to the tag.
  • the reader After receiving the handle information sent by the tag, the reader sends an access command to the tag, where the access command includes the handle information in step 107 .
  • the tag sends a response message to the reader.
  • the tag After receiving the access command sent by the reader to the tag, the tag verifies whether the handle carried in the access command is consistent with the handle sent by the tag to the reader in step 107. If the verification is successful, the tag sends a response message to the reader; if the verification is not successful, the tag sends a response message to the reader. If the access command is inconsistent, the tag sends an error notification to the reader/writer, indicating that the handle carried by the access command is inconsistent with the handle sent by the tag to the reader/writer in step 107.
  • tags can be divided into passive tags, semi-active tags and active tags.
  • passive tags the energy for their operation is provided by the reader.
  • part of the energy of the continuous wave (CW) sent by the reader is used for internal processing such as encoding and decoding, modulation and demodulation of the tag.
  • the continuous wave is also used as a carrier to carry the uplink information of the tag.
  • semi-passive tags they may include batteries inside, and internal processing such as encoding and decoding, modulation and demodulation can be powered by batteries, but the continuous wave of the reader is still required as a carrier.
  • the above-mentioned reader/writer is a device with reading and writing functions, for example, it can be a device that reads or writes tag information.
  • the reader/writer can be understood as a device that communicates with a tag.
  • the form can be a terminal device, or a base station, or a device with reading and writing functions.
  • the reader/writer may include a helper and a receiver.
  • the link from the helper to the tag can be called a forward link or a downlink
  • the link from the tag to the receiver can be called a reverse link or an uplink
  • the link from the receiver to the helper can be called a forward downlink
  • the link from the helper to the receiver can be called a forward uplink
  • a helper may also be called an excitation source.
  • the helper is mainly used to send a continuous wave to the tag on the forward link, and the signal sent by the tag is received by the receiver on the reverse link.
  • the receiver can generate RFID signaling, send it to the helper via the forward downlink, and then forward it to the tag via the forward link by the helper.
  • the tag design is simple, and the application layer and air interface signaling are mixed together. Moreover, the tag only supports power consumption of microwatts or hundreds of microwatts, so it cannot support complex designs or complex measurements.
  • time division multiplexing is usually used, and multiple tags use serial reading, so it does not support the distinction between frequency domain and code domain, and the parallel performance is poor. Therefore, the communication solution of the tag needs to be simple and direct, without too complex measurements and calculations.
  • radio resource management (RRM):
  • Wireless networks are deployed in cells, and each cell has its own coverage. After the terminal device is turned on, it needs to go through the cell selection process to select a suitable cell to reside in before it can obtain services from the wireless network. At the same time, the terminal device is constantly moving. If the terminal device moves out of the coverage of the current service cell and enters a new cell, the terminal device needs to reselect the cell and reside in the new cell to obtain better services.
  • the cell selection and cell reselection processes both belong to the category of wireless resource management.
  • Wireless resource management is an essential mechanism for cellular mobile communication systems, which can assist the new radio (NR) to achieve load balancing, provide users with a better experience and improve the overall performance of the system.
  • Cell selection/reselection are both autonomous behaviors of the terminal device. The terminal device autonomously selects a cell with better signal quality/higher priority to reside in by measuring the signal quality of the service cell and the neighboring cell.
  • Cell selection technology Cell selection can be divided into four processes: frequency scanning, cell search, system message decoding and residence.
  • Frequency scanning may include: searching for cells and their power covered in the network environment where the terminal device is located according to the standards and frequency bands supported by the terminal device. If the terminal device has previously stored frequency information, the frequency scanning process will be skipped and the cell search will be performed directly. Only during the initial cell selection will the band scanning process be performed according to the band supported by the terminal device's capabilities.
  • the radio resource control (RRC) layer sends a band scanning request to the physical layer, and the physical layer reports the frequency points scanned under the frequency band. After receiving the frequency points, the RRC layer constructs a frequency point list for cell search.
  • RRC radio resource control
  • Cell search is the process of capturing the cell with the best coverage in the network environment according to the scanning results after the frequency scanning is completed, performing frame synchronization, time slot synchronization and obtaining the physical cell identification of the cell.
  • the purpose of cell search is to obtain frame synchronization and time slot synchronization using the primary synchronization signal (PSS) and the secondary synchronization signal (SSS).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • Understanding system information and cell camping is the process of reading the cell system information after the cell search is completed and measuring the cell signal strength and signal quality to determine whether the cell meets the camping conditions.
  • the transmission power is obtained from different system messages.
  • Cell selection quality value S1-S2-S3-S4; where S1 is the reference signal received quality (RSRQ) of the cell, S2 is the minimum RSRQ receiving strength requirement in the cell, S3 is the offset value corresponding to the minimum RSRQ, and S4 is the temporary offset.
  • RSRQ reference signal received quality
  • Intra-frequency cell reselection refers to cell reselection on the same frequency as the current serving cell, and does not involve frequency priority processing.
  • Inter-frequency cell reselection includes inter-frequency cell reselection and inter-system cell reselection, and the optimal cell judgment needs to be combined with frequency priority information.
  • the terminal device calculates, measures and sorts the signal quality of the current serving cell and adjacent cells, and selects the cell with the best signal quality as the new resident cell.
  • the terminal device may not start the same-frequency measurement.
  • the terminal device For inter-frequency cell reselection, the terminal device first obtains the priority information of the current serving cell and the adjacent cells, and then calculates, measures and sorts the signal quality of the current serving cell and the adjacent cells. For cells with low priority, the threshold for judging whether the cell selection conditions are met is increased accordingly, thereby increasing the weight of high-priority cells, and then the highest priority cell that meets the signal quality standard is selected as the reselected cell to reside in.
  • the above-mentioned cell selection technology and cell reselection technology are mainly designed for terminal devices with certain processing capabilities. They have high requirements on the processing capabilities of terminal devices, and require terminal devices to evaluate the cell quality of neighboring cells, which requires accurate and complex parameter measurements.
  • low-complexity design and limited-capability terminal devices such as tags
  • this technology is not friendly to low-complexity design and limited-capability terminal devices (such as tags).
  • tags if the above-mentioned cell selection technology is adopted, it will bring greater overhead, affect the tag access efficiency, and further affect the capacity of the cell.
  • an embodiment of the present application provides a cell selection method, in which the terminal device can determine whether the target cell is a resident cell without performing complex measurement calculations, thereby reducing the data processing capability requirements for the terminal device and reducing the measurement overhead of the terminal device.
  • the steps are simple and flexible and can be applicable to terminal devices with low-complexity design and limited capabilities such as tags.
  • the technical solution provided in the present application can be used in various communication systems, which can be a 3rd generation partnership project (3GPP) communication system, such as a 4th generation (4G) long term evolution (LTE) system, a 5th generation (5G) new radio (NR) system, a vehicle to everything (V2X) system, a system of LTE and NR hybrid networking, or a device-to-device (D2D) system, a machine-to-machine (M2M) communication system, an Internet of Things (IoT), a passive IoT (PIoT), and other next generation communication systems.
  • 3GPP 3rd generation partnership project
  • 4G 4th generation
  • LTE long term evolution
  • NR 5th generation new radio
  • V2X vehicle to everything
  • D2D device-to-device
  • M2M machine-to-machine
  • IoT Internet of Things
  • PoT passive IoT
  • the communication system can also be a non-3GPP communication system, such as a wireless
  • An exemplary communication system provided in an embodiment of the present application may include a terminal device and an access network device.
  • the terminal device may be located within the coverage provided by the access network device.
  • terminal equipment also known as user equipment (UE), mobile station (MS), mobile terminal (MT) and terminal
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • terminal devices refers to equipment that provides voice and/or data connectivity to users.
  • handheld devices with wireless connection functions vehicle-mounted devices, etc.
  • terminal devices are: mobile phones, tablet computers, laptops, PDAs, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminal devices in industrial control, wireless terminal devices in self-driving, wireless terminal devices in remote medical surgery, wireless terminal devices in smart grids, wireless terminal devices in transportation safety, wireless terminal devices in smart cities, wireless terminal devices in smart homes, or tags, etc.
  • MID mobile internet devices
  • VR virtual reality
  • AR augmented reality
  • the tag can be regarded as a low-complexity design, limited-capability terminal device.
  • the terminal device can be a passive terminal device, that is, the energy and carrier required for the terminal device to work can be provided by the access network device.
  • a passive tag can be regarded as a passive terminal device.
  • the terminal device can also be an active or semi-passive terminal device, which is not specifically limited in this application.
  • access network equipment refers to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network, and can also be called a base station (BS).
  • RAN nodes are: evolved Node B (gNB), transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (BS), etc.
  • the access network equipment may include a central unit (CU) node, a distributed unit (DU) node, or a RAN device including a CU node and a DU node.
  • the RAN device including the CU node and the DU node splits the protocol layer of the eNB in the long term evolution (LTE) system, places the functions of some protocol layers in the CU for centralized control, and distributes the functions of some or all of the protocol layers in the DU, and the DU is centrally controlled by the CU.
  • LTE long term evolution
  • the access network device in the present application may also implement the function of a reader/writer, or may implement the function of an excitation source as shown in FIG. 2 .
  • the access network device in the embodiment of the present application may include various forms of base stations.
  • the access network device may be a micro base station (Micro BS), which may communicate with a terminal device through a Uu interface;
  • the base station may be an AP, which may communicate with a terminal device through a sidelink (SL);
  • the base station may be an IAB node, which may communicate with a macro base station (Macro BS) through a Uu interface, and communicate with a terminal device through a Uu interface.
  • the access network equipment in the present application may include a macro base station and an IAB node (or relay node).
  • a downlink can be established between the IAB node and the terminal device, and an uplink can be established between the macro base station and the terminal device, that is, the IAB node can be used as an excitation source to provide energy or carrier to the terminal device to realize the function of the helper shown in FIG2 , and the macro base station can realize the function of the receiver shown in FIG2 .
  • an uplink can be established between the IAB node and the terminal device, and a downlink can be established between the macro base station and the terminal device.
  • the execution subject may execute some or all of the steps in the embodiments of the present application, and these steps or operations are only examples, and the embodiments of the present application may also execute other operations or variations of various operations.
  • the various steps may be executed in different orders presented in the embodiments of the present application, and it is possible that not all operations in the embodiments of the present application need to be executed.
  • the method provided in the following embodiments of the present application can be applied to the scenario of the 5G NR system, or can be applied to the scenario of the wireless local area network.
  • this is only an exemplary description of the application scenario of the present application, and the application scenario does not impose any limitation on the present application, and the present application does not specifically limit the application scenario of the method provided below.
  • a cell selection method provided in an embodiment of the present application includes the following steps:
  • the terminal device obtains a target signal of a target cell.
  • the target signal may be used by the terminal device to determine the signal quality of the target cell.
  • the target signal acquired by the terminal device is sent by the target access network device to which the target cell belongs, that is, step 501 may include: the target access network device sends the target signal, and the terminal device receives the target signal sent by the target access network device. That is, the terminal device acquiring the signal can be understood as the terminal device receiving the signal.
  • the target signal includes a beacon, a reference signal, a synchronization signal, a system message or downlink data, etc., which is not specifically limited here.
  • the terminal device determines the number of target signals successfully acquired continuously.
  • the terminal can determine whether to confirm continuous successful reception by judging the time interval for receiving the target signal. For example, if the interval time for successfully receiving the target signal is greater than the time threshold, it is judged as discontinuous reception; if the interval time for successfully receiving the target signal is less than or equal to the time threshold, it is judged as continuous reception.
  • the time threshold can be the monitoring time, or other preset time parameters, or cell configuration parameters, which are not limited here.
  • each target signal may carry a number, and the terminal determines whether the received target signal numbers are continuous or not, for example, if the received signal numbers are continuous, it is determined to be continuous reception.
  • the target access network device can send multiple target signals to the terminal device in a time period, and accordingly, the terminal device can receive these target signals.
  • the terminal device cannot receive all the target signals, but can only receive part of the target signals.
  • the access network device sends 5 target signals to the terminal device, but the terminal device only obtains 2 target signals.
  • the target access network device of the target cell may send a target signal to the terminal device in multiple time periods.
  • the access network device sends 5 target signals in time period 1 and also sends a target signal in time period 2.
  • the target signal obtained by the terminal device is sent by the target access network device in the same time period, and the target signal obtained by the terminal device is continuous; Otherwise, it is discontinuous. That is to say, when multiple target signals acquired by the terminal device are located in the same time period, the multiple target signals can be considered continuous; if the multiple target signals acquired by the terminal device are located in multiple time periods, the target signals located in different time periods can be considered discontinuous. That is, in Figure 6, the target signals 6 and 7 acquired by the terminal device in time period 2 are discontinuous with the target signals 1 and 2 acquired in time period 1, and the target signals 1 and 2 acquired in time period 1 are continuous.
  • the above example uses the target access network device sending the target signal to the terminal device in a time period.
  • the target signal can also be sent in other time units, such as in a frame or a subframe.
  • the terminal device can also use the time when the target signal is searched as the starting time, and count the number of consecutive successful acquisitions of the target signal after this time; or the terminal can also use j as a period to periodically trigger the process of counting the number of consecutive successful acquisitions of the target signal.
  • j can be carried by the target signal or a preset parameter stored by the terminal.
  • the terminal device may also only determine the number of target signals successfully acquired within the time T, without considering whether the acquired target signals are continuous.
  • the terminal device determines whether the target cell is a resident cell.
  • the terminal device can determine that the target cell corresponding to the target signal is a resident cell, and the resident cell is a cell that meets the cell selection criteria of the terminal device.
  • the terminal device can select the target cell for communication.
  • Another implementation method is that when the terminal device determines that the number of target signals successfully received in succession is less than or equal to the threshold b, that is, it does not meet the requirements of the cell selection criteria of the terminal device, the terminal device determines that the target cell is an unresidence cell.
  • the unresidence cell is a cell that does not meet the requirements of the cell selection criteria of the terminal device, and the terminal device cannot select the target cell for communication.
  • the terminal device determines that the target cell meets the cell selection criteria of the terminal device.
  • the cell selection criteria in the embodiment of the present application is that the number of target signals successfully acquired continuously by the terminal device is greater than the threshold value b.
  • the terminal device determines that the number of target signals successfully acquired continuously is a, where a is a positive integer greater than a threshold value b.
  • Threshold value b is a threshold value required by a cell selection criterion of the terminal device. That is, when the number of target signals successfully acquired continuously by the terminal device is a greater than the threshold value b required by the cell selection criterion, the terminal device can determine that the target cell meets the cell selection criterion of the terminal device.
  • the threshold b may be preset, configured by the terminal device, or configured by the target cell.
  • the target cell may carry the threshold b in the target signal. The specific details are not limited here.
  • the terminal device determining that a target signals are successfully acquired continuously may include: the terminal device successfully acquires a target signals continuously within time T1.
  • T1 can be a time period.
  • the terminal device determines that a target signals are successfully acquired continuously, that is, the terminal device successfully acquires a target signals continuously during the time period when the target access network device sends the target signal.
  • the target access network device sends 5 target signals in time period 1, but affected by the signal quality of the target cell, the terminal device only acquires 2 target signals. It can be understood that when the number of target signals sent by the target access network device remains unchanged, the number of target signals acquired by the terminal device increases as the signal quality of the target cell improves. Therefore, the terminal device can measure the signal quality of the target cell according to the number of acquired target signals, thereby determining whether the target cell can be selected as a resident cell.
  • the terminal device determines that the number of target signals successfully acquired continuously is less than or equal to the threshold b required by the cell selection criteria, the terminal device determines that the target cell does not meet the cell selection criteria of the terminal device, and the terminal device determines that the target cell is a non-residence cell.
  • the terminal device can determine that the number of target signals successfully acquired continuously does not meet the requirements of the cell selection criteria of the terminal device.
  • the terminal device determines that the number of target signals successfully acquired continuously is less than or equal to the threshold b required by the cell selection criteria, which may include: the terminal device determines that the number of target signals successfully acquired continuously within time T1 is less than or equal to the threshold b required by the cell selection criteria.
  • the terminal device determines whether the target cell meets the cell selection criteria of the terminal device, it is determined based on whether the number of target signals successfully acquired continuously is greater than the threshold b. In addition, the terminal device can also determine based on whether the number of target signals successfully acquired is greater than the threshold b, without considering whether the multiple target signals acquired are continuous.
  • the method may further include the following step 504:
  • the terminal device After the terminal device determines that the target cell is a non-residence-inable cell, the terminal device adds restriction conditions to the target cell as a residency-inable cell.
  • the terminal device determines that the target cell is a non-residence cell, it can reselect a cell as a residency cell.
  • restriction conditions may be added to cells that currently do not meet the cell selection requirements or cannot operate normally, such as the case in step 505 .
  • the terminal device may add restriction conditions to the target cell as a resident cell.
  • the terminal device after the terminal device determines that the target cell is a non-residence-incapable cell, the terminal device cannot select the target cell as a residency-incapable cell within T3.
  • the terminal device may re-determine the target cell as a resident cell, and the threshold c is greater than the threshold b.
  • the terminal device can reselect a residency cell.
  • the terminal device will add restrictions to the target cell as a residency cell.
  • the threshold c is greater than the threshold b.
  • the terminal device adds restriction conditions to re-determine the target cell as a resident cell, thereby preventing the terminal device from selecting a cell whose signal quality has not changed again in a short period of time, thereby improving the efficiency of cell selection.
  • the terminal device may re-determine the target cell as a resident cell, and the threshold c is less than the threshold b.
  • the terminal device when the terminal device re-determines the cell in which it can reside, the terminal device relaxes the requirements of the cell selection criteria, thereby preventing the terminal from always failing to search for a cell that meets the conditions of the cell selection criteria.
  • the method may further include the following steps:
  • the terminal device After the terminal device resides in the target cell, it is determined that the terminal device is in an abnormal working state.
  • the terminal device determines that the target cell is a resident cell and communicates with the target cell, if the first condition is met, the terminal device determines that the current working state of the terminal device is an abnormal working state.
  • the first condition may include at least one of the following: the number of times that the terminal device has not successfully received the target signal continuously is greater than m (after communicating with the target cell, the target access network device of the target cell will still send the target signal to the terminal device); the number of times the terminal device determines that random access has failed is greater than n; the number of times the terminal device determines that data transmission has failed is greater than s. It may also be other situations in which the terminal device is determined to be in an abnormal working state, such as the block error rate of the data received by the terminal device within time T4 is greater than the threshold t, etc., which are not specifically limited here.
  • the terminal device reselects a cell.
  • the terminal device After the terminal device determines that the terminal device is in an abnormal working state or the cell does not meet the cell selection criteria, the terminal device can reselect a cell as a resident cell for connection.
  • a restriction condition may be added to the target cell.
  • the specific restriction condition may be similar to the restriction condition in step 504 and will not be described in detail here.
  • the resident cell can send auxiliary information to the terminal device.
  • the information can be carried in signals such as connection release messages and/or system messages.
  • the signal may include information of other cells, such as the frequency, time, period and other information of the target signal sent by other cells, so that the terminal device can select a cell based on the information.
  • the target cell can configure the threshold and other information of the terminal device selecting the cell through the target signal.
  • the target signal is a system message, a synchronization signal and a paging message
  • the target signal can carry at least one of the above-mentioned time T1, time T2, time T3, time T4, threshold b, and threshold c.
  • another cell selection method provided in an embodiment of the present application includes the following steps:
  • the terminal device obtains a target signal of a target cell.
  • step 501 The specific steps are similar to step 501 in the above-mentioned embodiment 1, and will not be described in detail here.
  • the first protocol layer of the terminal device receives a synchronization indication from the second protocol layer.
  • the second protocol layer of the terminal device can generate a synchronization signal according to the target signal. indication or an out-of-sync indication, and sending the in-sync indication or the out-of-sync indication to the first protocol layer.
  • the first protocol layer and the second protocol layer may be entity modules in the terminal device, the first protocol layer is a first module, and the second protocol layer is a second module.
  • the second module (second protocol layer) of the terminal device generates a synchronization indication or an out-of-sync indication including the following steps:
  • the second module first measures the signal to interference plus noise ratio (SINR) of the acquired target signal;
  • the second module determines the block error rate (BLER) of the target signal according to the SINR of the target signal;
  • the second module If the block error rate of the target signal is less than the threshold value k, the second module generates a corresponding synchronization indication, which can reflect that the target cell and the terminal device may have good communication quality, and transmits the synchronization indication to the first module. If the block error rate of the target signal is greater than or equal to the threshold value k, no synchronization indication is generated, or the second module generates a corresponding out-of-sync indication, and transmits the out-of-sync indication to the first module, which can reflect that the target cell and the terminal device may have poor communication quality.
  • the better the signal quality of the target cell the lower the block error rate of the target signal obtained by the terminal device. Accordingly, the more synchronization indications the terminal device generates, the fewer asynchronous indications. It can be understood that when the number of target signals sent by the target access network device remains unchanged, the number of synchronization indications received by the first protocol layer of the terminal device increases as the signal quality of the target cell improves. Therefore, the terminal device can measure the signal quality of the target cell according to the number of synchronization indications received by the first protocol layer, thereby determining whether the target cell can be selected as a resident cell.
  • the first protocol layer and the second protocol layer both belong to the protocol layer of the terminal device, and the layer of the first protocol layer is higher than the second protocol layer.
  • the protocol layer of the terminal device may include protocol layers such as the radio resource control layer (RRC), the medium access control sublayer (MAC) and the physical layer (PHY). These include the above-mentioned first protocol layer and the second protocol layer, for example, the first protocol layer may be the RRC layer, and the second protocol layer may be the PHY layer. It may also be the other two layers, which are not specifically limited here.
  • the measurement period of the terminal device measuring the SINR of the target signal may be related to the reference signal, and the reference signal may be a Beacon, a synchronization signal, etc.
  • the terminal device may determine that the measurement period of the terminal device is N periods according to the indication of the protocol or the broadcast message, where N is an integer greater than or equal to 1.
  • the terminal device determines the number of synchronization indications that the first protocol layer has successfully received continuously from the second protocol layer.
  • the terminal device determines the number of synchronization indications that the first protocol layer has successfully received consecutively from the second protocol layer.
  • the terminal device can determine the number of synchronization indications and asynchronous indications continuously received by the first protocol layer within a certain time; in another implementation method, since the synchronization indication of the terminal device corresponds one-to-one to the target signal, when limiting the acquisition of the target signal within a certain time in step 801, there is no need to impose additional time limitations on the synchronization indication and the asynchronous indication.
  • the terminal device determines whether the target cell is a resident cell.
  • the terminal device when the terminal device determines that the number of synchronization indications transmitted by the second protocol layer that are continuously successfully received by the first protocol layer is greater than a threshold value e, that is, the terminal device determines that the number of synchronization indications successfully obtained continuously meets the requirements of the cell selection criteria of the terminal device, then the terminal device can determine that the target cell is a resident cell, and the resident cell is a cell that meets the requirements of the cell selection criteria of the terminal device, and the terminal device can select the target cell for communication.
  • a threshold value e that is, the terminal device determines that the number of synchronization indications successfully obtained continuously meets the requirements of the cell selection criteria of the terminal device
  • Another implementation method is that when the terminal device determines that the number of asynchronous indications successfully received continuously by the first protocol layer is greater than the threshold value e, or the terminal device determines that the number of synchronization indications transmitted by the second protocol layer successfully received continuously by the first protocol layer is less than or equal to the threshold value e, that is, the terminal device determines that the number of synchronization indications successfully obtained continuously by the terminal device does not meet the requirements of the cell selection criteria of the terminal device, the terminal device can determine that the target cell is an unresidence cell, and the unresidence cell is a cell that does not meet the requirements of the cell selection criteria of the terminal device, and the terminal device cannot select the target cell for communication.
  • the terminal device determines that the number of synchronization indications from the second protocol layer that are continuously and successfully received by the first protocol layer is greater than a threshold value e
  • the terminal device determines that the target cell meets the cell selection criteria of the terminal device.
  • the cell selection criteria in this embodiment is that the number of synchronization indications from the second protocol layer that are continuously and successfully received by the first protocol layer is greater than the threshold value e.
  • the terminal device determines that the first protocol layer has successfully received d synchronization indications from the second protocol layer, and d is greater than a threshold value e, where the threshold value e is a threshold value required by the cell selection criteria of the terminal device.
  • the threshold value e is a threshold value required by the cell selection criteria of the terminal device.
  • the terminal device determines that the number of synchronization indications from the second protocol layer that are continuously and successfully received by the first protocol layer is less than or equal to a threshold value e, the terminal device determines that the target cell does not meet the cell selection criteria of the terminal device.
  • the terminal device determines that the number of synchronization indications transmitted by the second protocol layer that are continuously and successfully received by the first protocol layer is less than or equal to the threshold value e, or the terminal device determines that the number of asynchronous indications that are continuously and successfully received by the first protocol layer is greater than the threshold value e, and the threshold value e is the threshold value required by the cell selection criteria of the terminal device.
  • the terminal device can determine that the target cell meets the cell selection criteria of the terminal device.
  • the threshold e can be preset, configured by the terminal device, or configured by the target cell.
  • the target cell can carry the threshold e in the target signal. The specific details are not limited here.
  • the method may further include the following step 805:
  • the terminal device After the terminal device determines that the target cell is a non-residence-inable cell, the terminal device adds restriction conditions to the target cell as a residency-inable cell.
  • restrictions may be added to cells that do not meet the current cell selection criteria or cannot work properly, such as the case of step 505.
  • restrictions may also be added to the target cell when reselecting a cell.
  • the terminal device may reselect a cell as a resident cell after determining that the target cell is a non-resident cell.
  • the terminal device may add restriction conditions to the target cell as a resident cell.
  • the terminal device after the terminal device determines that the target cell is a non-residence-incapable cell, the terminal device cannot select the target cell as a residency-incapable cell within T3.
  • the terminal device may re-determine the target cell as a resident cell, and the threshold value f is greater than a threshold value e.
  • the terminal device can reselect a residency cell.
  • the terminal device will add restrictions to the target cell.
  • the number of target signals of the target cell needs to be greater than the threshold f before it can be re-determined as a residency cell, and the threshold f is greater than the threshold e.
  • selection can be made based on the threshold e.
  • the terminal device adds restriction conditions to re-determine the target cell as a resident cell, thereby preventing the terminal device from selecting the target cell whose signal quality has not changed again in a short period of time, thereby improving the cell selection efficiency.
  • the terminal device determines that the number of synchronization indications transmitted by the second protocol layer that are continuously and successfully received by the first protocol layer is greater than a threshold value l, the terminal device can re-determine the target cell as a resident cell, and the threshold value l is less than the threshold value e.
  • the terminal device when the terminal device re-determines the cell in which it can reside, the terminal device relaxes the requirements of the cell selection criteria, thereby preventing the terminal from always failing to search for a cell that meets the conditions of the cell selection criteria.
  • the method may further include the following steps:
  • the terminal device After the terminal device resides in the target cell, it is determined that the terminal device is in an abnormal working state.
  • step 505 The specific steps are similar to step 505 in the above-mentioned embodiment 1, and will not be described in detail here.
  • the terminal device reselects a cell.
  • step 506 The specific steps are similar to step 506 in the above-mentioned embodiment 1, and will not be described in detail here.
  • the target cell can configure the threshold and other information of the terminal device selecting the cell through the target signal.
  • the target signal is a system message, a synchronization signal and a paging message
  • the target signal can carry/include at least one of the above-mentioned time T2, time T3, time T4, threshold k, threshold e and threshold f.
  • another cell selection method provided in an embodiment of the present application includes the following steps:
  • the terminal device obtains a target signal of a target cell.
  • step 501 The specific steps are similar to step 501 in the above-mentioned embodiment 1, and will not be described in detail here.
  • the terminal device determines a target cell selection value of a target cell according to a signal quality of a target signal.
  • the terminal device determines the target cell selection value of the target cell according to the signal quality of the target signal, which may include follow these steps:
  • the terminal device measures the RSRP of the target signal
  • the terminal device determines the target cell selection value of the target cell by subtracting the threshold g from the RSRP of the target signal, where the threshold g is the minimum reception level required in the target cell.
  • the minimum reception level required by the target cell is related to the type of terminal device.
  • the type of terminal device is a tag
  • the minimum reception level required by the target cell is different for different types of tags.
  • the power levels of active tags, active tags, passive tags, and semi-passive tags are different, so the minimum reception intensity is also different.
  • active tags usually have the largest power and the largest tag coverage, and accordingly, the higher the minimum reception intensity; the power and tag coverage of semi-active tags are second, and accordingly, the minimum reception intensity is higher; the power of passive tags is the smallest, and the tag coverage is also the smallest, and accordingly, the minimum reception intensity is the lowest.
  • the threshold g may also be the sum of the minimum reception level threshold and other parameters, where the other parameters may be a temporary offset caused by a failure to establish a connection and/or parameters related to cell selection priority, wherein the cell selection priority may also be used.
  • the threshold g may be preset, may be specified by the protocol, may be configured by the terminal device, or may be configured by the target cell.
  • the target cell may carry the threshold g in the target signal.
  • the specifics are not limited here.
  • the threshold g is different for different tag types. Specifically, multiple thresholds may be defined, or the target cell may be configured with multiple thresholds.
  • the thresholds corresponding to different types of tags may also represent the minimum level difference by adding different offsets.
  • the signal quality may be represented by RSRS, or by other parameters, such as RSRQ, etc., which is not specifically limited in the present application.
  • the measurement period of the RSRP or RSRQ of the target signal measured by the terminal device may be related to the reference signal, and the reference signal may be a Beacon, a synchronization signal, etc.
  • the terminal device may determine that the measurement period of the terminal device is N periods according to the indication of the protocol or the broadcast message, where N is an integer greater than or equal to 1.
  • the terminal device determines whether the target cell is a resident cell.
  • the terminal device determines that the target cell quality of the target cell meets the cell criterion requirement, such as the S criterion, that is, the target cell selection value of the target cell meets the cell selection criterion of the terminal device
  • the terminal device determines that the target cell is a resident cell, and the resident cell is a cell that meets the cell selection criterion of the terminal device, and the terminal device can select the target cell for communication.
  • the cell selection criterion in this embodiment is that the target cell selection value of the target cell is greater than zero.
  • the terminal device when the terminal device determines that the target cell selection value of the target cell is less than zero, that is, the terminal device determines that the target cell selection value of the target cell does not meet the cell selection criteria of the terminal device, the terminal device can determine that the target cell is an unresidence cell.
  • the unresidence cell is a cell that does not meet the cell selection criteria of the terminal device, and the terminal device cannot select the target cell for communication.
  • the method may further include the following step 1004:
  • the terminal device After the terminal device determines that the target cell is a non-residence-inable cell, the terminal device adds restriction conditions to the target cell as a residency-inable cell.
  • the terminal device may reselect a cell as a resident cell after determining that the target cell is a non-resident cell.
  • the terminal device may add restriction conditions to the target cell as a resident cell.
  • restrictions may be added to cells that do not meet the current cell selection criteria or cannot work properly, such as the case of step 505.
  • restrictions may also be added to the target cell when reselecting a cell.
  • the terminal device after the terminal device determines that the target cell is a non-residence-incapable cell, the terminal device cannot select the target cell as a residency-incapable cell within T3.
  • the terminal device may re-determine the target cell as a resident cell, and the threshold h is greater than zero.
  • the terminal device can reselect a residency cell.
  • the terminal device can add restriction conditions to the target cell as a residency cell.
  • the target cell selection value of the target cell needs to be greater than the threshold h before it can be re-determined as a residency cell, and the threshold h is greater than zero.
  • the terminal device adds restriction conditions to re-determine the target cell as a resident cell, thereby preventing the terminal device from selecting the target cell whose signal quality has not changed again in a short period of time, thereby improving the cell selection efficiency.
  • the terminal device may re-determine the target cell as a resident cell, and the threshold value w is less than zero.
  • the terminal device when the terminal device re-determines the cell in which it can reside, the terminal device relaxes the requirements of the cell selection criteria, thereby preventing the terminal from always failing to search for a cell that meets the conditions of the cell selection criteria.
  • the method may further include the following steps:
  • the terminal device After the terminal device resides in the target cell, it is determined that the terminal device is in an abnormal working state.
  • step 505 The specific steps are similar to step 505 in the above-mentioned embodiment 1, and will not be described in detail here.
  • the terminal device reselects a cell.
  • step 506 The specific steps are similar to step 506 in the above-mentioned embodiment 1, and will not be described in detail here.
  • the target cell can configure the threshold and other information of the terminal device selecting the cell through the target signal.
  • the target signal is a system message, a synchronization signal and a paging message
  • the target signal can carry/include at least one of the above-mentioned time T2, time T3, time T4, threshold g and threshold h.
  • the terminal device includes hardware structures and/or software modules corresponding to the execution of each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.
  • the embodiment of the present application can divide the functional modules of the terminal device according to the above method embodiment.
  • each functional module can be divided according to each function, or two or more functions can be integrated into one processing module.
  • the above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.
  • the terminal device may adopt the composition structure shown in Figure 13, or include the components shown in Figure 13.
  • the embodiment of the present application may also adopt the composition structure shown in Figure 13, or include the components shown in Figure 13.
  • Figure 13 is a composition diagram of a communication device 1300 provided in the present application.
  • the communication device 1300 can be a chip or a system on chip in the terminal device; or, it can be a module or a chip or a system on chip in the terminal device.
  • the communication device 1300 includes at least one processor 1301 and at least one communication interface (FIG. 13 is merely an example of a communication interface 1304 and a processor 1301).
  • the communication device 1300 may also include a communication bus 1302 and a memory 1303.
  • the processor 1301 may be a general-purpose central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof.
  • the processor 1301 may also be other devices with processing functions, such as circuits, devices, or software modules, without limitation.
  • the communication bus 1302 is used to connect different components in the communication device 1300 so that the different components can communicate.
  • the communication bus 1302 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in FIG. 13, but it does not mean that there is only one bus or one type of bus.
  • the communication interface 1304 is used to communicate with other devices or communication networks.
  • the communication interface 1304 can be a module, a circuit, a transceiver, or any device capable of implementing communication.
  • the communication interface 1304 can also be an input and output interface located in the processor 1301 to implement signal input and signal output of the processor.
  • the memory 1303 may be a device with a storage function, used to store instructions and/or data, wherein the instructions may be computer programs.
  • the memory 1303 may be a read-only memory (ROM) or other types of static storage devices that can store static information and/or instructions, or a random access memory (RAM) or other types of dynamic storage devices that can store information and/or instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CDROM), or a read-only optical disk.
  • ROM read-only memory
  • RAM random access memory
  • EEPROM electrically erasable programmable read-only memory
  • CD-ROM compact disc read-only memory
  • CD-ROM compact disc storage
  • optical disc storage including compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.
  • magnetic disk storage media or other magnetic storage devices, etc. are not restricted.
  • the memory 1303 may exist independently of the processor 1301, or may be integrated with the processor 1301.
  • the memory 1303 may be located inside the communication device 1300, or may be located outside the communication device 1300, without limitation.
  • the processor 1301 may be used to execute instructions stored in the memory 1303 to implement the methods provided in the following embodiments of the present application.
  • the communication device 1300 may further include an output device 1305 and an input device 1306.
  • the output device 1305 communicates with the processor 1301 and may display information in a variety of ways.
  • the output device 1305 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector.
  • the input device 1306 communicates with the processor 1301 and may receive user input in a variety of ways.
  • the input device 1306 may be a mouse, a keyboard, a touch screen device, or a sensor device.
  • the structure shown in FIG13 does not constitute a specific limitation on the terminal device.
  • the terminal device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently.
  • the components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.
  • FIG14 shows a schematic diagram of the structure of a terminal device 1400.
  • the terminal device 1400 includes a processing module 1401 and a transceiver module 1402.
  • the terminal device 1400 may also include a storage module (not shown in FIG. 14 ) for storing program instructions and data.
  • the transceiver module 1402 which may also be referred to as a transceiver unit, is used to implement the sending and/or receiving functions.
  • the transceiver module 1402 may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the transceiver module 1402 may include a receiving module and a sending module, which are respectively used to execute the receiving and sending steps performed by the terminal device in the above-mentioned method embodiments, and/or used to support other processes of the technology described herein; the processing module 1401 may be used to execute the processing steps (such as determination, generation, etc.) performed by the terminal device in the above-mentioned method embodiments, and/or used to support other processes of the technology described herein.
  • the processing module 1401 is used to obtain a target signal of a target cell through the transceiver module 1402;
  • the processing module 1401 is further configured to determine, when the terminal device successfully acquires a target signal continuously, that the target cell is a resident cell, where a is a positive integer greater than a threshold value b, and the resident cell is a cell that meets the cell selection criteria of the terminal device; or
  • the processing module 1401 is further configured to determine that the target cell is a non-residence cell when the number of target signals successfully acquired continuously by the terminal device is less than or equal to a threshold b.
  • the non-residence cell is a cell that does not meet the cell selection criteria of the terminal device.
  • the terminal device successfully acquires a target signals continuously, including: the terminal device successfully acquires a target signals continuously within time T1; or the number of target signals successfully acquired continuously by the terminal device is less than or equal to threshold b, including: the number of target signals successfully acquired continuously by the terminal device within time T1 is less than or equal to threshold b.
  • the processing module 1401 is further configured to, after the terminal device determines that the target cell is a non-residence cell, re-determine the target cell as a residency cell if the number of target signals successfully acquired continuously within time T2 is greater than a threshold c, and the threshold c is greater than a threshold b; or
  • the processing module 1401 is further configured to not select the target cell as a resident cell within T3 after the terminal device determines that the target cell is a non-resident cell.
  • the processing module 1401 is further configured to, after the terminal device determines that the target cell is a resident cell, if the first condition is met, determine that the terminal device is in an abnormal working state, and the terminal device re-determines the resident cell.
  • the first condition includes at least one of the following: the number of times the terminal device fails to successfully receive the target signal continuously is greater than m; the number of times the terminal device determines that random access fails is greater than n; the number of times the terminal device determines that data transmission fails is greater than s; the terminal device determines that the block error rate of data acquired within time T4 is greater than t.
  • the target signal includes at least one of a beacon, a synchronization signal, a paging signal, a system message and downlink data.
  • the processing module 1401 is used to obtain a target signal of a target cell through the transceiver module 1402, where the target signal is used to generate a synchronization indication;
  • the processing module 1401 is further configured to determine that the target cell is a resident cell when the first protocol layer of the terminal device successfully obtains d synchronization indications from the second protocol layer continuously, d is a positive integer greater than a threshold value e, and the protocol layer of the terminal device includes the first a protocol layer and a second protocol layer, the first protocol layer being higher than the second protocol layer; or
  • the processing module 1401 is also used to determine that the target cell is an unresidence cell when the number of synchronization indications from the second protocol layer successfully obtained continuously by the first protocol layer of the terminal device is less than or equal to a threshold value e, or when the number of asynchronous indications from the second protocol layer successfully obtained continuously by the first protocol layer of the terminal device is greater than a threshold value e.
  • the unresidence cell is a cell that does not meet the cell selection criteria required by the terminal device.
  • the processing module 1401 is further configured to, after the terminal device determines that the target cell is a non-residence cell, re-determine the target cell as a residency cell if the number of synchronization indications continuously and successfully received by the first protocol layer of the terminal device from the second protocol layer within time T2 is greater than a threshold f, and the threshold f is greater than a threshold e; or
  • the processing module 1401 is further configured to not select the target cell as a resident cell within T3 after the terminal device determines that the target cell is a non-resident cell.
  • the processing module 1401 is further configured to, after the terminal device determines that the target cell is a resident cell, if the first condition is met, determine that the terminal device is in an abnormal working state, and the terminal device re-determines the resident cell.
  • the first condition includes at least one of the following: the number of times the terminal device fails to successfully receive the target signal continuously is greater than m; the number of times the terminal device determines that the random access channel fails is greater than n; the number of times the terminal device determines that the data transmission fails is greater than s; the terminal device determines that the block error rate of the data acquired within time T4 is greater than t.
  • the target signal includes at least one of a beacon, a synchronization signal, a paging signal, a system message and downlink data.
  • the processing module 1401 is used to obtain a target signal of a target cell through the transceiver module 1402;
  • the processing module 1401 is further configured to determine a target cell selection value of a target cell according to a signal quality of a target signal;
  • the processing module 1401 is further configured to determine, when the target cell selection value of the target cell is greater than zero, that the target cell is a resident cell, where the resident cell is a cell that meets the cell selection criteria of the terminal device; or
  • the processing module 1401 is further configured to determine that the target cell is a non-residence cell when the target cell selection value of the target cell is less than or equal to zero.
  • the non-residence cell is a cell that does not meet the cell selection criteria of the terminal device.
  • the target cell selection value of the target cell is the signal quality of the target signal minus a threshold g, where the threshold g is a minimum reception level of the terminal device.
  • the processing module 1401 is further configured to, after the terminal device determines that the target cell is a non-residence cell, re-determine the target cell as a residency cell if the target cell selection value of the target cell is greater than a threshold h within time T2, and the threshold h is greater than zero; or
  • the processing module 1401 is further configured to not select the target cell as a reside-able cell within T3 after the terminal device determines that the target cell is a non-residence-able cell.
  • the processing module 1401 is further configured to, after the terminal device determines that the target cell is a resident cell, if the first condition is met, the terminal device determines that the terminal device is in an abnormal working state, and the terminal device re-determines the resident cell.
  • the first condition includes at least one of the following: the number of times the terminal device fails to successfully receive the target signal continuously is greater than m; the number of times the terminal device determines that the random access channel fails is greater than n; the number of times the terminal device determines that the data transmission fails is greater than s; the terminal device determines that the block error rate of the data acquired within time T4 is greater than t.
  • the target signal includes at least one of a beacon, a synchronization signal, a paging signal, a system message and downlink data.
  • the processing module receives/sends information through the transceiver module, which can also be understood as: the processing module controls the transceiver module to receive/send information.
  • the processing module sends information through the transceiver module, which can be understood as: the processing module outputs information to the transceiver module, and the transceiver module sends the information; the processing module receives information through the transceiver module, which can be understood as: the transceiver module receives information and inputs the information to the processing module.
  • the terminal device 1400 is presented in the form of dividing various functional modules in an integrated manner.
  • the "module” here may refer to a specific application-specific integrated circuit (ASIC), a circuit, a processor and a memory that executes one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above functions.
  • ASIC application-specific integrated circuit
  • the terminal device 1400 may take the form of the communication device 1100 shown in FIG. 11 .
  • the function/implementation process of the processing module 1401 in FIG. 14 can be implemented by the processor 1301 in the communication device 1300 shown in FIG. 13 calling the computer execution instructions stored in the memory 1303.
  • the enabling/implementing process may be implemented through the communication interface 1304 in the communication device 1300 shown in FIG. 13 .
  • the function/implementation process of the transceiver module 1402 can be implemented through the input and output interface (or communication interface) of the chip or the chip system, and the function/implementation process of the processing module 1401 can be implemented through the processor (or processing circuit) of the chip or the chip system.
  • the terminal device 1400 provided in this embodiment can execute the above method, the technical effects that can be obtained can refer to the above method embodiments and will not be repeated here.
  • the terminal device of the embodiment of the present application can be implemented using the following: one or more field programmable gate arrays (FPGA), programmable logic devices (PLD), controllers, state machines, gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits that can perform the various functions described throughout this application.
  • FPGA field programmable gate arrays
  • PLD programmable logic devices
  • state machines gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits that can perform the various functions described throughout this application.
  • an embodiment of the present application further provides a communication device, which includes a processor for implementing a method in any of the above method embodiments.
  • the communication device further includes a memory.
  • the memory is used to store necessary computer programs and data.
  • the computer program may include instructions, and the processor may call the instructions in the computer program stored in the memory to instruct the communication device to execute the method in any of the above method embodiments.
  • the memory may not be in the communication device.
  • the communication device also includes an interface circuit, which is a code/data read/write interface circuit, which is used to receive computer execution instructions (computer execution instructions are stored in a memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor.
  • an interface circuit which is a code/data read/write interface circuit, which is used to receive computer execution instructions (computer execution instructions are stored in a memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor.
  • the communication device further includes a communication interface, and the communication interface is used to communicate with a module outside the communication device.
  • the communication device can be a chip or a chip system.
  • the communication device can be composed of chips, or it can include chips and other discrete devices.
  • the embodiments of the present application do not specifically limit this.
  • the present application also provides a computer-readable storage medium on which a computer program or instruction is stored.
  • a computer program or instruction is stored on which a computer program or instruction is stored.
  • the present application also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.
  • the systems, devices and methods described in the present application can also be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, i.e., they may be located in one place, or they may be distributed over multiple network units.
  • the components shown as units may or may not be physical units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above embodiments it can be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • a software program it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When loading and executing computer program instructions on a computer, all or part of the processes (or functions) described in the embodiments of the present application are implemented.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center.
  • the computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that includes one or more servers that can be integrated with a medium.
  • the available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.
  • the computer may include the device described above.

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Abstract

本申请提供了一种小区选择方法及终端设备，涉及通信领域。在小区选择过程中，降低了对于终端设备的能力要求。该方法包括：终端设备获取目标小区的目标信号；在终端设备连续成功获取a个目标信号的情况下，终端设备确定目标小区为可驻留小区，a为大于阈值b的正整数，可驻留小区为满足终端设备的小区选择准则要求的小区；或者在终端设备连续成功获取的目标信号的数量小于或等于阈值b的情况下，终端设备确定目标小区为不可驻留小区，不可驻留小区为不满足终端设备的小区选择准则要求的小区。

Description

小区选择方法及终端设备
本申请要求于2022年10月31日提交国家知识产权局、申请号为202211349198.5、申请名称为“一种小区选择方法及终端设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信技术领域，尤其涉及一种小区选择方法及终端设备。
背景技术
随着第五代(5th generation，5G)移动通信等移动网络技术的发展，越来越多的终端设备需要进行移动网络的连接。终端设备在接入网络时，往往有多个小区可供选择，因此终端设备需要在多个小区中选出合适的小区进行无线网络连接。
目前的小区选择技术中，终端设备需要搜索终端设备所处的网络环境中的小区及其对应的功率，然后按照搜索结果对网络环境中覆盖最好的小区进行捕获，同时对该小区进行帧同步，并获取该小区的物理小区身份标识号(identity document，ID)。然后终端设备读取小区系统消息并对小区的信号强度和信号质量进行测量，从而判断该小区是否满足驻留条件。
现有的多小区选择方案中，终端设备测量小区的信号质量的步骤繁杂，且需要进行精确的参数计算，因此对终端设备测量需求高，不适合低复杂设计、能力受限的终端设备。
发明内容
本申请实施例提供了一种小区选择方法及终端设备，在小区选择过程中，降低了对于终端设备的能力要求。
第一方面，本申请实施例提供了一种小区选择方法，应用于终端设备，该方法包括：终端设备获取目标小区的目标信号；在终端设备连续成功获取a个目标信号的情况下，终端设备确定目标小区为可驻留小区，a为大于阈值b的正整数，可驻留小区为满足终端设备的小区选择准则要求的小区；或者在终端设备连续成功获取的目标信号的数量小于或等于阈值b的情况下，终端设备确定目标小区为不可驻留小区，不可驻留小区为不满足终端设备的小区选择准则要求的小区。
本申请实施例提供的小区选择方法，终端设备不用进行复杂的测量计算，只需要根据目标信号的数量是否大于阈值b就可以确定该目标小区是否为可驻留小区，降低了对于终端设备数据的处理能力要求，减少了终端设备的测量开销，步骤简单灵活，适用于低复杂设计、能力受限的终端设备。
在一种可能的实现方式中，上述终端设备连续成功获取a个目标信号，包括：终端设备在时间T1内连续成功获取a个目标信号；
或者终端设备连续成功获取的目标信号的数量小于或等于阈值b，包括：终端设备在时间T1内连续成功获取的目标信号的数量小于或等于阈值b。
在另一种可能的实现方式中，上述终端设备可以以搜索到目标信号的时间为起始时间，统计该时间之后连续成功获取目标信号的个数；
或者终端也可以以j为周期，周期性触发统计连续成功获取目标信号个数的流程，j可以由目标信号携带，也可以为终端储存的预设参数。
在另一种可能的实现方式中，在终端设备确定目标小区为不可驻留小区之后，上述方法还包括：在时间T2内连续成功获取到的目标信号的个数大于阈值c的情况下，终端设备重新确定目标小区为可驻留小区，阈值c大于阈值b；或在终端设备确定目标小区为不可驻留小区之后，上述方法还包括：终端设备在T3时间内不选择目标小区作为可驻留小区。
本申请实施例提供的小区选择方法，在终端设备确定目标小区为不可驻留小区之后，终端设备对选择驻留目标小区进行了限制，避免短时间内重复监听不满足选择准则的小区的目标信号。
在另一种可能的实现方式中，在终端设备确定目标小区为不可驻留小区之后，上述方法还包 括：在时间T2内连续成功获取到的目标信号的个数大于阈值c的情况下，终端设备重新确定目标小区为可驻留小区，阈值c小于阈值b。
本申请实施例提供的小区选择方法，在终端设备确定目标小区为不可驻留小区之后，终端设备放松了小区选择准则的要求，避免终端始终搜索不到满足小区选择准则条件的小区。
在另一种可能的实现方式中，在终端设备确定目标小区为可驻留小区之后，上述方法还包括：若第一条件满足，终端设备确定终端设备为非正常工作状态，并且终端设备重新确定可驻留小区。
在另一种可能的实现方式中，上述第一条件包括以下至少一项：终端设备未连续成功接收到目标信号的次数大于m；终端设备确定随机接入失败的次数大于n；终端设备确定数据传输失败的次数大于s；终端设备确定时间T4内接收到的数据的误块率大于t。
在另一种可能的实现方式中，上述终端设备重新确定可驻留小区包括：终端设备在T3时间内不选择目标小区作为可驻留小区；或者在时间T2内连续成功获取到的目标信号的个数大于阈值i的情况下，终端设备才能重新确定目标小区为可驻留小区，阈值i大于阈值b。
本申请实施例提供的小区选择方法，在终端设备重新确定可驻留小区时，终端设备对于目标小区在一定时间内再次确定为可驻留小区增加了一些限制条件，避免了短时间内再次选择到无法满足正常工作需求的目标小区。
在另一种可能的实现方式中，上述终端设备重新确定可驻留小区包括：在时间T2内连续成功获取到的目标信号的个数大于阈值i的情况下，终端设备重新确定目标小区为可驻留小区，阈值i小于阈值b。
本申请实施例提供的小区选择方法，在终端设备重新确定可驻留小区时，终端设备放松了小区选择准则的要求，避免终端始终搜索不到满足小区选择准则条件的小区。
在另一种可能的实现方式中，上述目标信号包括信标、参考信号、同步信号、寻呼信号、下行数据和系统消息中的至少一项。
在另一种可能的实现方式中，上述目标信号包括时间T1、时间T2、时间T3、时间T4、阈值b、阈值i和/或阈值c。
第二方面，本申请实施例提供了一种小区选择方法，应用于终端设备，该方法包括：终端设备获取目标小区的目标信号，目标信号用于生成同步指示；在终端设备的第一协议层连续成功获取到来自第二协议层的d个同步指示的情况下，终端设备确定目标小区为可驻留小区，d为大于阈值e的正整数，终端设备的网络层级包括第一协议层和第二协议层，第一协议层高于第二协议层；或者终端设备的第一协议层连续成功获取到来自第二协议层的同步指示的个数小于或等于阈值e情况下，或在终端设备的第一协议层连续成功获取到来自第二协议层的不同步指示的个数大于阈值e的情况下，终端设备确定目标小区为不可驻留小区，不可驻留小区为不满足终端设备的小区选择准则要求的小区。
本申请实施例提供的小区选择方法，终端设备根据同步指示的数量是否大于阈值d就可以确定该目标小区是否为可驻留小区，降低了对于终端设备数据的处理能力要求，减少了终端设备的测量开销，步骤简单灵活，适用于低复杂设计、能力受限的终端设备。
在一种可能的实现方式中，在终端设备确定目标小区为不可驻留小区之后，上述方法还包括：在时间T2内终端设备的第一协议层连续成功接收到来自第二协议层的同步指示的个数大于阈值f的情况下，终端设备重新确定目标小区为可驻留小区，阈值f大于阈值e；或在所述终端设备确定所述目标小区为不可驻留小区之后，上述方法还包括：终端设备在T3时间内不选择目标小区作为可驻留小区。
本申请实施例提供的小区选择方法，在终端设备确定目标小区为不可驻留小区之后，终端设备对于目标小区在一定时间内再次确定为可驻留小区增加了一些限制条件，避免短时间内重复监听不满足选择准则的小区的目标信号。
在另一种可能的实现方式中，在终端设备确定目标小区为不可驻留小区之后，上述方法还包括：第一协议层连续成功获取到来自第二协议层的同步指示的个数大于阈值l的情况下，终端设备重新确定目标小区为可驻留小区，阈值l小于阈值e。
本申请实施例提供的小区选择方法，在终端设备确定目标小区为不可驻留小区之后，终端设备放松了小区选择准则的要求，避免终端始终搜索不到满足小区选择准则条件的小区。
在另一种可能的实现方式中，在终端设备确定目标小区为可驻留小区之后，上述方法还包括： 若第一条件满足，终端设备确定终端设备为非正常工作状态，并且终端设备重新确定可驻留小区。
在另一种可能的实现方式中，上述第一条件包括以下至少一项：终端设备未连续成功接收到目标信号的次数大于m；终端设备确定随机接入信道失败的次数大于n；终端设备确定数据传输失败的次数大于s；终端设备确定时间T4内接收到的数据的误块率大于t。
在另一种可能的实现方式中，上述终端设备重新确定可驻留小区包括：终端设备在T3时间内不选择目标小区作为可驻留小区；或者第一协议层连续成功获取到来自第二协议层的同步指示的个数大于阈值i的情况下，终端设备才能重新确定目标小区为可驻留小区，阈值i大于阈值e。
本申请实施例提供的小区选择方法，在终端设备重新确定可驻留小区时，终端设备对于目标小区在一定时间内再次确定为可驻留小区增加了一些限制条件，避免了短时间内再次选择到无法满足正常工作需求的目标小区。
在另一种可能的实现方式中，上述终端设备重新确定可驻留小区包括：在时间T2内连续成功获取到的目标信号的个数大于阈值i的情况下，终端设备重新确定目标小区为可驻留小区，阈值i小于阈值e。
本申请实施例提供的小区选择方法，在终端设备重新确定可驻留小区时，终端设备放松了小区选择准则的要求，避免终端始终搜索不到满足小区选择准则条件的小区。
在另一种可能的实现方式中，上述目标信号包括信标、参考信号、同步信号、寻呼信号、系统消息和下行数据中的至少一项。
在另一种可能的实现方式中，上述目标信号包括时间T2、时间T3、时间T4、阈值e和/或阈值f。
第三方面，本申请实施例提供了一种小区选择方法，应用于终端设备，该方法包括：
终端设备获取目标小区的目标信号；终端设备根据目标信号的信号质量确定目标小区的目标小区选择值；在目标小区的目标小区选择值大于零的情况下，终端设备确定目标小区为可驻留小区，可驻留小区为满足终端设备的小区选择准则要求的小区；或者在目标小区的目标小区选择值小于或等于零的情况下，终端设备确定目标小区为不可驻留小区，不可驻留小区为不满足终端设备的小区选择准则要求的小区。
本申请实施例提供的小区选择方法，终端设备可以根据目标小区选择值是否大于零确定该目标小区是否为可驻留小区，降低了终端设备的测量要求，步骤简单灵活，适用于低复杂设计、能力受限的终端设备。
在另一种可能的实现方式中，所述目标小区的目标小区选择值为所述目标信号的信号质量减去阈值g，所述阈值g为所述终端设备的最小接收水平。
在另一种可能的实现方式中，在终端设备确定目标小区为不可驻留小区之后，上述方法还包括：在时间T2内目标小区的目标小区选择值大于阈值h的情况下，终端设备重新确定目标小区为可驻留小区，阈值h大于零；或在所述终端设备确定所述目标小区为不可驻留小区之后，所述方法还包括：终端设备在T3时间内不选择目标小区作为可驻留小区。
本申请实施例提供的小区选择方法，在终端设备确定目标小区为不可驻留小区之后，终端设备对于目标小区在一定时间内再次确定为可驻留小区增加了一些限制条件，避免了短时间内再次选择到无法满足正常工作需求的目标小区。
在另一种可能的实现方式中，在终端设备确定目标小区为不可驻留小区之后，上述方法还包括：目标小区的目标小区选择值大于阈值w的情况下，终端设备重新确定目标小区为可驻留小区，阈值w小于零。
本申请实施例提供的小区选择方法，在终端设备确定目标小区为不可驻留小区之后，终端设备放松了小区选择准则的要求，避免终端始终搜索不到满足小区选择准则条件的小区。
在另一种可能的实现方式中，在终端设备确定目标小区为可驻留小区之后，上述方法还包括：若第一条件满足，终端设备确定终端设备为非正常工作状态，并且终端设备重新确定可驻留小区。
在另一种可能的实现方式中，上述第一条件包括：终端设备未连续成功接收到目标信号的次数大于m；和/或终端设备确定随机接入信道失败的次数大于n；和/或终端设备确定数据传输失败的次数大于s；和/或终端设备确定时间T4内获取的数据的误块率大于t。
在另一种可能的实现方式中，上述终端设备重新确定可驻留小区包括：终端设备在T3时间内不选择目标小区作为可驻留小区；或者目标小区的目标小区选择值大于阈值i的情况下，终端设备 才能重新确定目标小区为可驻留小区，阈值i大于阈值e。
本申请实施例提供的小区选择方法，在终端设备重新确定可驻留小区时，终端设备对于目标小区在一定时间内再次确定为可驻留小区增加了一些限制条件，避免了短时间内再次选择到无法满足正常工作需求的目标小区。
在另一种可能的实现方式中，上述终端设备重新确定可驻留小区包括：目标小区的目标小区选择值大于阈值i的情况下，终端设备重新确定目标小区为可驻留小区，阈值i小于阈值e。
本申请实施例提供的小区选择方法，在终端设备重新确定可驻留小区时，终端设备放松了小区选择准则的要求，避免终端始终搜索不到满足小区选择准则条件的小区。
在另一种可能的实现方式中，上述目标信号包括信标、参考信号、同步信号、寻呼信号、系统消息和下行数据中的至少一项。
在另一种可能的实现方式中，上述目标信号包括时间T2、时间T3、时间T4、阈值g和/或阈值h。
第四方面，提供了一种通信装置用于实现各种方法。该通信装置可以为第一方面或第二方面或第三方面中的终端设备，或者终端设备中包含的装置，比如芯片或芯片系统；该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
所述通信装置包括实现方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与功能相对应的模块或单元。
在一些可能的设计中，该通信装置可以包括处理模块和收发模块。该处理模块，可以用于实现上述任一方面及其任意可能的实现方式中的处理功能。该收发模块，也可以称为收发单元，用以实现上述任一方面及其任意可能的实现方式中的发送和/或接收功能。该收发模块可以由收发电路，收发机，收发器或者通信接口构成。
在一些可能的设计中，收发模块包括发送模块和/或接收模块，分别用于实现上述任一方面及其任意可能的实现方式中的发送或接收功能。
第五方面，提供一种通信装置，包括：处理器和通信接口；该通信接口，用于与该通信装置之外的模块通信；所述处理器用于执行计算机程序或指令，以使该通信装置执行任一方面所述的方法。该通信装置可以为第一方面或第二方面或第三方面中的终端设备，或者终端设备中包含的装置，比如芯片或芯片系统；该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
第六方面，提供了一种通信装置，包括：至少一个处理器；所述处理器用于执行存储器中存储的计算机程序或指令，以使该通信装置执行任一方面所述的方法。该存储器可以与处理器耦合，或者，该存储器也可以独立于处理器存在，例如，存储器和处理器为两个独立的模块。该存储器可以位于所述通信装置之外，也可以位于所述通信装置之内。
该通信装置可以为第一方面或第二方面或第三方面中的终端设备，或者终端设备中包含的装置，比如芯片或芯片系统。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
第七方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有计算机程序或指令，当其在通信装置上运行时，使得通信装置可以执行任一方面所述的方法。
第八方面，提供了一种包含指令的计算机程序产品，当其在通信装置上运行时，使得该通信装置可以执行任一方面所述的方法。
可以理解的是，第四方面至第八方面中任一方面提供的通信装置是芯片时，通信装置的发送动作/功能可以理解为输出信息，通信装置的接收动作/功能可以理解为输入信息。
其中，第四方面至第八方面中任一种设计方式所带来的技术效果可参见第一方面至第三方面中不同设计方式所带来的技术效果，在此不再赘述。
第九方面，提供一种通信系统，该通信系统包括上述方面所述的终端设备和上述方面所述的目标小区所属的接入网设备。
应当理解的是，本申请中对技术特征、技术方案、有益效果或类似语言的描述并不是暗示在任意的单个实施例中可以实现所有的特点和优点。相反，可以理解的是对于特征或有益效果的描述意味着在至少一个实施例中包括特定的技术特征、技术方案或有益效果。因此，本说明书中对于技术 特征、技术方案或有益效果的描述并不一定是指相同的实施例。进而，还可以任何适当的方式组合本实施例中所描述的技术特征、技术方案和有益效果。本领域技术人员将会理解，无需特定实施例的一个或多个特定的技术特征、技术方案或有益效果即可实现实施例。在其他实施例中，还可在没有体现所有实施例的特定实施例中识别出额外的技术特征和有益效果。
附图说明
图1为一种标签与读写器的选择、盘存和访问的流程示意图；
图2为本申请实施例提供的一种分布式架构下读写器和标签的通信链路示意图；
图3为本申请实施例提供的一种通信系统的结构示意图；
图4为本申请实施例提供的另一种通信系统的结构示意图；
图5为本申请实施例提供的一种小区选择方法的流程示意图；
图6为本申请实施例提供的一种终端设备获取目标信号的场景示意图；
图7为本申请实施例提供的另一种小区选择方法的流程示意图；
图8为本申请实施例提供的另一种小区选择方法的流程示意图；
图9为本申请实施例提供的另一种小区选择方法的流程示意图；
图10为本申请实施例提供的另一种小区选择方法的流程示意图；
图11为本申请实施例提供的一种标签覆盖范围场景示意图；
图12为本申请实施例提供的另一种小区选择方法的流程示意图；
图13为本申请实施例提供的一种终端设备的结构示意图；
图14为本申请实施例提供的另一种终端设备的结构示意图。
具体实施方式
在本申请的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，其中A，B可以是单数或者复数。
在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a-c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。
另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念，便于理解。
可以理解，说明书通篇中提到的“实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。因此，在整个说明书各个实施例未必指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。可以理解，在本申请的各种实施例中，各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
可以理解，本申请实施例中的一些可选的特征，在某些场景下，可以不依赖于其他特征，比如其当前所基于的方案，而独立实施，解决相应的技术问题，达到相应的效果，也可以在某些场景下，依据需求与其他特征进行结合。相应的，本申请实施例中给出的装置也可以相应的实现这些特征或功能，在此不予赘述。
本申请中，除特殊说明外，各个实施例之间相同或相似的部分可以互相参考。在本申请中各个实施例如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相 互引用，不同的实施例根据其内在的逻辑关系可以组合形成新的实施例。以下所述的本申请实施方式并不构成对本申请保护范围的限定。
为了方便理解本申请实施例的技术方案，首先给出本申请相关技术的简要介绍如下：
第一、射频识别(radio-frequency identification,RFID)技术：
RFID技术是一种非接触式的自动识别技术。在RFID系统通常包括读写器(reader/interrogator)和标签(tag)，通过读写器与标签之间的信息交互，读写器可以对标签进行管理。
在RFID系统中，读写器可以对标签进行选择(select)、盘存(inventory)和访问(access)等操作。选择操作用于为盘存和访问选择一个或一组标签。盘存操作可以理解为读写器识别标签的过程。访问操作可以理解为读写器与标签交互的过程。标签在访问前需要被读写器识别。
示例性的，读写器对标签进行选择、盘存、访问的流程可以如图1所示。参见图1，该流程包括如下步骤：
101、读写器向标签发送选择(select)命令。
读写器向标签发送选择(select)命令，该select命令可以用于选择一个或一组标签。
示例性的，该select命令可以包括内存信息，内存信息指示的存储区中存储的数据与Mask值一致的标签为该select命令选择的标签。
102、读写器向标签发送询问(Query)命令/询问调整(QueryAdjust)命令/询问代表(QueryRep)命令。
读写器向标签发送Query命令/QueryAdjust命令/QueryRep命令。
对于读写器选择的多个标签，通过时分复用的方式进行盘存访问，即读写器结束对一个标签的盘存访问后，开始下一个标签的盘存访问。下述步骤以对1个标签的盘存访问为例进行说明。
步骤101-步骤102可以理解为读写器对标签的选择操作。在选择操作完成后，读写器可以对标签进行如下盘存操作。
103、标签发送RN16给读写器。
在标签启动的时隙计数器为0的情况下，响应于读写器发送的命令，标签发送16位随机数(RN16)给读写器。
一种可能的实现方式中，在标签启动的时隙计数器不为0的情况下，标签并不会发送RN16给读写器。
104、读写器发送确认消息给标签。
若读写器成功接收标签发送的RN16，则读写器发送确认(acknowledgment，ACK)消息给标签。该消息中包括该随机数RN16。
105、标签向读写器发送产品电子码(electronic product code，EPC)。
标签在接收到读写器发送的确认消息后，在确认消息携带的随机数RN16与步骤103中发送的随机数RN16相匹配的情况下，标签向读写器发送产品电子码。
步骤103-步骤105可以理解为读写器对标签的盘存操作。在盘存操作完成后，读写器可以对标签进行如下访问操作：
106、读写器发送Req_RN指令给标签。
读写器发送Req_RN指令给标签，该Req_RN指令中包括与上述步骤中相同的RN16。
107、标签向读写器发送handle信息。
在接收到读写器发送的包括RN16的Req_RN后，在读写器发送的RN16与之前的标签生成的RN16一致或匹配的情况下，标签向读写器发送handle信息。
一种可能的实现方式中，在读写器发送的RN16与之前的标签生成的RN16不一致或不匹配的情况下，标签不向读写器反馈handle信息。
108、读写器向标签发送访问命令。
在接收到标签发送的handle信息后，读写器向标签发送访问命令，该访问命令中包括步骤107中的handle信息。
109、标签向读写器发送响应信息。
在接收到读写器向标签发送的访问命令后，标签验证该访问命令携带的handle是否与步骤107中标签向读写器发送的handle一致。若验证通过即一致，则标签向读写器发送响应信息；若验证不 通过即不一致，则标签向读写器发送错误通知，该错误通知指示该访问命令携带的handle与步骤107中标签向读写器发送的handle不一致。
以上只是示例，读写器和标签之间还包括其他类型的操作，具体可以参考RFID系统的相关描述，本申请在此不再赘述。
上述标签即RFID标签。标签可以分为无源标签、半有源标签和有源标签。对于无源标签，其工作的能量由读写器提供，例如，读写器发送的连续波(continuous wave，CW)的部分能量用于标签的编解码、调制解调等内部处理，此外，该连续波还作为载波用于承载标签的上行信息。对于半无源标签，其内部可以包括电池，编解码、调制解调等内部处理可以借助电池供电，但仍然需要读写器的连续波作为载波。
上述读写器是具有读写功能的设备，例如，可以是读取或写入标签信息的设备。或者，读写器可以理解为与标签通信的设备。形态可以为终端设备，也可以是基站，或者是一个具有读写功能的设备。示例性的，在分离式架构下，如图2所示，读写器可以包括辅助器(helper)和接收器(receiver)。其中，helper到标签的链路可以称为前向链路或下行链路，标签到receiver的链路可以称为反向链路或上行链路，receiver到helper的链路可以称为前传下行链路，helper到receiver的链路可以称为前传上行链路。本申请中，helper也可以称为激励源。
示例性的，helper主要用于在前向链路上向标签发送连续波，标签发送的信号由receiver在反向链路上接收。此外，receiver可以生成RFID信令，通过前传下行链路发送至helper，再由helper通过前向链路转发至标签。
在RFID系统中，标签设计简单，应用层和空口信令杂糅到一起设计。而且标签仅支持微瓦级或者百微瓦级的功耗，因此不能支持复杂的设计，也不支持复杂的测量。同时多标签与读写器通信时，通常采用时分复用的方式，多标签采用串行读取方式，因此并不支持频域和码域的区分，并行性能较差。因此标签的通信方案需要简单直接，不能有太过复杂的测量和计算。
第二、无线资源管理(radio resource management，RRM)：
无线网络以小区为单位进行部署，每个小区都有自己的覆盖范围。终端设备开机后，需要通过小区选择过程，选择一个合适的小区进行驻留，才能从无线网络获取服务。同时终端设备是不断移动的，如果终端设备移动出了当前服务小区的覆盖范围，进入了新小区，那么终端设备需要进行小区重选，驻留在新的小区上，以获得更优质的服务。小区选择和小区重选过程，都属于无线资源管理的范畴。无线资源管理是蜂窝移动通信系统必备的机制，能够辅助新空口(new radio,NR)实现负载均衡，为用户提供更好的体验以及提高系统整体性能。小区选择/重选都是终端设备自主的行为，终端设备通过测量服务小区和邻区的信号质量，自主的选择信号质量更好/优先级更高的小区进行驻留。
1、小区选择技术：小区选择一共可以分为4个过程：扫频、小区搜索、解系统消息和驻留。
扫频可以包括：按照终端设备支持的制式和频段，搜索终端设备所处的网络环境中覆盖的小区及其功率。如果终端设备之前存储过频点信息，那么就会跳过扫频流程，直接进行小区搜索。只有在初始小区选择的时候，才会按照终端设备能力支持的Band，进行扫Band流程。示例性的，在扫频过程中，无线资源控制(radio resource control，RRC)层给物理层发送扫Band请求，物理层上报该频段下扫到的频点。RRC层收到频点后，会构造一个用于小区搜索的频点列表。
小区搜索是在扫频结束后按照扫频结果对网络环境中覆盖最好的小区进行捕获，对该小区进行帧同步、时隙同步和获取物理小区标识的过程。小区搜索的目的是利用主同步信号(primary synchronization signal，PSS)和辅同步信号(secondary synchronization signal，SSS)获得帧同步和时隙同步。
解系统消息和小区驻留是在小区搜索完成后读取小区系统消息并对小区信号强度、信号质量进行测量，判断该小区是否满足驻留条件的过程。
小区驻留，判断该小区是否满足驻留条件通常是判断该小区的小区选择接收值和小区选择质量值是否都大于零，其中，
小区选择接收值＝P1-P2-P3-P4-P5；其中，P1为小区的参考信号接收功率(reference signal received power，RSRP)，P2为小区中要求的最小接收强度，P3为对应最小接收强度的偏移值，P4为临时偏移量，P5＝max(P6-P7,0)-(min(P8，P7)-min(P6，P7))或P5＝max(P6-P7，0)，其中P7为终端设备功率等级决定的最大射频发射功率，P6和P8为终端设备在小区中允许的最大上 行发射功率，分别从不同的系统消息中获得。
小区选择质量值＝S1-S2-S3-S4；其中，S1为小区的参考信号接收质量(reference signal received quality，RSRQ)，S2为小区中最小RSRQ接收强度要求，S3为对应最小RSRQ的偏移值，S4为临时偏移量。
2、小区重选技术：
小区重选可以分为同频小区重选和异频小区重选，同频小区重选是指在与当前服务小区相同的频率上进行的小区重选，不涉及频点的优先级处理。异频小区重选包括异频小区重选以及异系统小区重选，需要结合频点的优先级信息来进行最优小区判断。
对于同频小区重选，终端设备对于当前服务小区和相邻小区的信号质量进行计算测量并排序，选择其中信号质量最好的小区作为新的驻留小区。
在小区选择接收值大于小区选择接收值阈值，且小区选择质量值大于小区选择质量值阈值的情况下，终端设备可以不启动同频测量。
对于异频小区重选，终端设备先获取当前服务小区和相邻小区的优先级信息，然后再对当前服务小区和相邻小区的信号质量进行计算测量并排序。对于优先级低的小区，相应地会增加判断是否满足小区选择条件的阈值，从而增加高优先级小区的权重，然后选择其中满足信号质量标准的最高优先级小区作为重新选择出来驻留的小区。
上述小区选择技术和小区重选技术，主要是针对具有一定处理能力的终端设备而设计的，对终端设备的处理能力要求较高，需要终端设备对邻区的小区质量进行评估，需要精确且复杂的参数测量，而低复杂设计、能力受限的终端设备(例如标签)无法支持精确的参数测量，因此，该技术对于低复杂设计、能力受限的终端设备(例如标签)并不友好。此外，对于标签而言，若采用上述小区选择技术会带来较大的开销，影响标签接入效率，进一步影响小区的容量。
基于此，本申请实施例提供了一种小区选择方法，该方法中，终端设备不用进行复杂的测量计算即可确定目标小区是否为可驻留小区，降低了对于终端设备的数据处理能力要求，减少了终端设备的测量开销，步骤简单灵活，可以适用于标签等低复杂设计、能力受限的终端设备。
本申请提供的技术方案可用于各种通信系统，该通信系统可以为第三代合作伙伴计划(3rd generation partnership project，3GPP)通信系统，例如，第四代(4th generation，4G)长期演进(long term evolution，LTE)系统、第五代(5th generation，5G)新无线(new radio，NR)系统、车联网(vehicle to everything，V2X)系统、LTE和NR混合组网的系统、或者设备到设备(device-to-device，D2D)系统、机器到机器(machine to machine，M2M)通信系统、物联网(Internet of Things，IoT)、无源IoT(passive IoT，PIoT)，以及其他下一代通信系统等。或者，该通信系统也可以为非3GPP通信系统，例如无线局域网(wireless local area network，WLAN)，不予限制。
本申请实施例提供的一种示例性的通信系统。该通信系统可以包括终端设备和接入网设备。终端设备可以位于接入网设备提供的覆盖范围内。
可选的，终端设备，又称之为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端设备(mobile terminal，MT)和终端等，是指向用户提供语音和/或数据连通性的设备。例如，具有无线连接功能的手持式设备、车载设备等。目前，一些终端设备的举例为：手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端设备、无人驾驶(self driving)中的无线终端设备、远程手术(remote medical surgery)中的无线终端设备、智能电网(smart grid)中的无线终端设备、运输安全(transportation safety)中的无线终端设备、智慧城市(smart city)中的无线终端设备、智慧家庭(smart home)中的无线终端设备、或标签等。
可选的，标签可以看成一种低复杂设计、能力受限终端设备。终端设备可以为无源终端设备，即终端设备工作时所需的能量和载波可以由接入网设备提供，例如无源标签就可以看做是一种无源终端设备。当然，终端设备也可以为有源或半无源终端设备，本申请对此不作具体限定。
可选的，接入网设备，是指将终端设备接入到无线网络的无线接入网(radio access network，RAN)节点(或设备)，又可以称为基站(base station，BS)。目前，一些RAN节点的举例为：继续演进的节点B(gNB)、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B， NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，或无线保真(wireless fidelity，Wifi)接入点(access point，AP)等。另外，在一种网络结构中，接入网设备可以包括集中单元(centralized unit，CU)节点、或分布单元(distributed unit，DU)节点、或包括CU节点和DU节点的RAN设备。其中包括CU节点和DU节点的RAN设备将长期演进(long term evolution，LTE)系统中eNB的协议层拆分开，部分协议层的功能放在CU集中控制，剩下部分或全部协议层的功能分布在DU中，由CU集中控制DU。
可选的，本申请中的接入网设备也可以实现读写器的功能，或者可以实现图2所示的激励源的功能。
示例性的，本申请实施例中的接入网设备可以包括各种形式的基站。如图3中的(a)所示，接入网设备可以为微基站(Micro BS)，该微基站可以通过Uu接口与终端设备通信；如图3中的(b)所示，基站可以为AP，该AP可以通过侧行链路(sidelink，SL)与终端设备通信；如图3中的(c)所示，基站可以为IAB节点，该IAB节点可以与宏基站(Macro BS)通过Uu接口通信，以及通过Uu接口与终端设备通信。
可选的，作为另一种产品形态，本申请中的接入网设备可以包括宏基站和IAB节点(或中继节点)。其中，如图4中的(a)所示，IAB节点和终端设备之间可以建立下行链路，宏基站和终端设备之间可以建立上行链路，即IAB节点可以作为激励源向终端设备提供能量或载波实现图2所示的helper的功能，宏基站可以实现图2所示的receiver的功能。或者，如图4中的(b)所示，IAB节点和终端设备之间可以建立上行链路，宏基站和终端设备之间可以建立下行链路。
可以理解的，本申请实施例中，执行主体可以执行本申请实施例中的部分或全部步骤，这些步骤或操作仅是示例，本申请实施例还可以执行其它操作或者各种操作的变形。此外，各个步骤可以按照本申请实施例呈现的不同的顺序来执行，并且有可能并非要执行本申请实施例中的全部操作。
需要说明的是，本申请下述实施例中各个设备之间的消息名字或消息中各参数的名字等只是一个示例，具体实现中也可以是其他的名字，本申请实施例对此不作具体限定。
示例性的，本申请下述实施例提供的方法可以应用于5G NR系统的场景，或者，可以应用于无线局域网的场景。当然，此处仅是示例性的对本申请的应用场景进行说明，该应用场景对本申请不造成任何限定，本申请对下述提供的方法的应用场景也不作具体限定。
如图5所示，为本申请实施例提供的一种小区选择方法，该通信方法包括如下步骤：
501、终端设备获取目标小区的目标信号。
可选的，该目标信号可用于终端设备确定该目标小区的信号质量。
具体地，本申请实施例中，终端设备获取的目标信号是目标小区所属的目标接入网设备发送的，即该步骤501可以包括：目标接入网设备发送目标信号，终端设备接收目标接入网设备发送的目标信号。即终端设备获取信号可以理解为终端设备接收信号。
本申请实施例中该目标信号包括信标(Beacon)、参考信号、同步信号、系统消息或下行数据等，具体此处不作限定。
502、终端设备确定连续成功获取的目标信号的数量。
一种实现方式中，终端可以通过判断接收目标信号的时间间隔来判断是否确认为连续成功接收，比如，成功接收目标信号间隔时间大于时间阈值，则判断为非连续接收；成功接收目标信号间隔时间小于或等于时间阈值，则判断为连续接收，所述时间阈值可以为监听时间，或其他预设时间参数，或小区配置参数，具体此处不作限定。
另一种实现方式，每个目标信号可以携带编号，终端通过判断接收到的目标信号编号是否连续来判断是否为连续接收，比如，接收信号的编号是连续的则判断为连续接收。
示例性的，如图6所示，本申请实施例中，目标接入网设备可以在一个时间段向终端设备发送多个目标信号，相应地，终端设备可以接收这些目标信号。但在目标小区的信号质量较差的情况下，终端设备并不能接收到全部目标信号，只能接收到部分目标信号。例如图6中接入网设备向终端设备发送了5个目标信号，但终端设备只获取到2个目标信号。
本申请实施例中，目标小区的目标接入网设备可以在多个时间段向终端设备发送目标信号，例如图6中接入网设备在时间段1发送5个目标信号，在时间段2也会发送目标信号，终端设备获取到的目标信号是目标接入网设备在同一个时间段发送的，则终端设备获取到的目标信号是连续的； 否则就是不连续的。也就是说，终端设备获取到的多个目标信号位于同一时间段时，可以认为该多个目标信号是连续的；若终端设备获取到的多个目标信号位于多个时间段中，可以认为位于不同时间段中的目标信号是不连续的。即在图6中，终端设备在时间段2获取到的目标信号6和目标信号7与时间段1获取到的目标信号1和目标信号2是不连续的，在时间段1获取到的目标信号1和目标信号2是连续的。
上述以目标接入网设备在一个时间段向终端设备发送目标信号为例，除此之外，也可以是在其他时间单位内发送目标信号，例如在一个帧或者在一个子帧内发送目标信号，具体此处不做限定。本申请实施例中，终端设备也可以以搜索到目标信号的时间为起始时间，统计该时间之后连续成功获取目标信号的个数；或者终端也可以以j为周期，周期性触发统计连续成功获取目标信号个数的流程，j可以由目标信号携带，也可以为终端储存的预设参数。
一种可能的实现方式中，终端设备也可以只确定在时间T内成功获取的目标信号的数量，并不考虑获取的目标信号是否连续。
503、终端设备确定目标小区是否为可驻留小区。
一种实现方式，在终端设备连续成功获取的目标信号的数量大于阈值b，即满足了终端设备的小区选择准则的情况下，终端设备可以确定目标信号对应的目标小区为可驻留小区，该可驻留小区为满足终端设备的小区选择准则的小区，终端设备可以选择该目标小区进行通信。
另一种实现方式，当终端设备确定连续成功接收到的目标信号的个数小于或等于阈值b后，即并不满足终端设备的小区选择准则的要求后，终端设备确定目标小区为不可驻留小区，该不可驻留小区为不满足终端设备的小区选择准则要求的小区，终端设备不可以选择该目标小区进行通信。
一种实现方式中，终端设备连续成功获取到的目标信号的数量大于阈值b时，终端设备确定目标小区满足终端设备的小区选择准则。可以理解的是，本申请实施例中的小区选择准则即为终端设备连续成功获取到的目标信号的数量大于阈值b。
具体地，终端设备确定连续成功获取的目标信号的个数为a，a为大于阈值b的正整数。阈值b为终端设备的小区选择准则要求的阈值。也就是说，终端设备连续成功获取的目标信号的个数a大于小区选择准则要求的阈值b时，终端设备就可以确定目标小区满足终端设备的小区选择准则。
本申请实施例中，该阈值b可以是预设的，也可以是终端设备配置的，也可以是目标小区配置的，例如目标小区可以在目标信号中携带该阈值b，具体此处不作限定。
可选的，上述终端设备确定连续成功获取a个目标信号可以包括：终端设备在时间T1内连续成功获取到a个目标信号。
可选的，T1可以为一个时间段。如图6所示，本申请实施例中，终端设备确定连续成功获取a个目标信号，即终端设备在目标接入网设备发送目标信号的时间段，连续成功获取到了a个目标信号。如图6所示，目标接入网设备在时间段1发送了5个目标信号，但受到目标小区的信号质量的影响，终端设备只获取到了2个目标信号。可以理解的是，在目标接入网设备发送的目标信号的数量不变的情况下，终端设备获取到的目标信号的数量随着目标小区的信号质量提升而提升，因此终端设备可以根据获取到的目标信号的数量衡量目标小区的信号质量，从而确定目标小区是否可以被选为可驻留小区。
另一种实现方式，终端设备确定连续成功获取到的目标信号的数量小于或等于小区选择准则要求的阈值b时，终端设备确定目标小区并不满足终端设备的小区选择准则，则终端设备确定目标小区为不可驻留小区。
具体地，在终端设备获取到的目标信号的数量小于或等于阈值b的情况下，因为阈值b为终端设备的小区选择准则的要求的阈值，所以终端设备就可以确定连续成功获取的目标信号的数量不满足终端设备的小区选择准则的要求。
可选的，上述终端设备确定连续成功获取到的目标信号的数量小于或等于小区选择准则要求的阈值b可以包括：终端设备确定在时间T1内连续成功获取到的目标信号的数量小于或等于小区选择准则要求的阈值b。
上述终端设备确定目标小区是否满足终端设备的小区选择准则时，根据连续成功获取到的目标信号的数量是否大于阈值b来确定，除此之外，终端设备也可以根据成功获取到的目标信号的数量是否大于阈值b来确定，并不考虑获取到的多个目标信号是否连续。
可选的，在一些实施场景下，如图7所示，该方法还可以包括下述步骤504：
504、在终端设备确定目标小区为不可驻留小区后，终端设备对目标小区作为可驻留小区增加限制条件。
在目标小区并不满足终端设备的小区选择准则情况下，终端设备确定目标小区为不可驻留小区后，可以重新选择小区作为可驻留小区。
在一些情况下，可以对当前不满足小区选择或者无法正常工作的小区增加限制条件，比如步骤505的情况。
在重新选择小区时，终端设备可以对目标小区作为可驻留小区增加限制条件。
一种可能的实现方式中，在终端设备确定目标小区为不可驻留小区后，终端设备在T3时间内不可以选择目标小区为可驻留小区。
一种可能的实现方式中，若终端设备确定在时间T2内接收到的目标小区的目标信号的个数大于阈值c，则终端设备可以重新确定目标小区为可驻留小区，阈值c大于阈值b。
具体地，终端设备在确定目标小区为不可驻留小区后，可以重新选择可驻留小区。在重新选择可驻留小区时，终端设备会对目标小区作为可驻留小区增加限制条件，在确定获取到的来自目标小区的目标信号的数量是否满足小区选择准则时，目标小区的目标信号的数量需要大于阈值c才可以重新确定为可驻留小区，阈值c大于阈值b。而在确定其他小区是否可作为可驻留小区时，可以根据阈值b进行选择。
上述列举了两种可实现的限制条件，也可以是其他限制条件，具体此处不做限定，
本申请实施例中，终端设备为再次确定目标小区为可驻留小区增加了限制条件，避免了短时间内终端设备再次选择到信号质量未改变的小区，从而提高小区选择效率。
一种可能的实现方式中，若终端设备确定在时间T2内接收到的目标小区的目标信号的个数大于阈值c，则终端设备可以重新确定目标小区为可驻留小区，阈值c小于阈值b。
本申请实施例提供的小区选择方法，在终端设备重新确定可驻留小区时，终端设备放松了小区选择准则的要求，避免终端始终搜索不到满足小区选择准则条件的小区。
可选的，在一些实施场景下，如图7所示，终端设备确定目标小区为可驻留小区后，该方法还可以包括下述步骤：
505、终端设备驻留在目标小区后，确定终端设备为非正常工作状态。
在终端设备确定目标小区为可驻留小区，并与该目标小区进行通信后，若满足第一条件，则终端设备确定终端设备的当前工作状态为非正常工作状态。
具体地，该第一条件可以包括以下至少一项：终端设备未连续成功接收到目标信号的次数大于m(在与目标小区进行通信后，目标小区的目标接入网设备依然会向终端设备发送目标信号)；终端设备确定随机接入失败的次数大于n；终端设备确定数据传输失败的次数大于s。也可以是其他确定终端设备为非正常工作状态的情况，例如终端设备在时间T4内接收到的数据的误块率大于阈值t等，具体此处不做限定。
506、终端设备重新选择小区。
在终端设备确定终端设备为非正常工作状态或者小区不满足小区选择准则后，终端设备可以重新选择小区作为可驻留小区进行连接。
一种可能的实现方式中，终端设备重新选择小区时，可以为目标小区增加限制条件，具体的限制条件可以与步骤504中的限制条件类似，此处不再赘述。
一种可能的实现方式中，驻留小区可以向终端设备发送辅助信息，该信息可以在连接释放消息和/或系统消息等信号中携带，该信号可以包括其他小区的信息，例如其他小区发送目标信号的频点、时间、周期等信息，从而使得终端设备可以根据该信息进行小区选择。
本申请实施例中，目标小区可以通过目标信号配置终端设备选择小区的阈值等信息。具体地，当目标信号是系统消息、同步信号和寻呼消息时，目标信号可以携带上述时间T1、时间T2、时间T3、时间T4、阈值b、阈值c中的至少一项。
如图8所示，为本申请实施例提供的另一种小区选择方法，该小区选择方法包括如下步骤：
801、终端设备获取目标小区的目标信号。
具体步骤与上述实施例一中的步骤501类似，具体此处不再赘述。
802、终端设备的第一协议层接收来自第二协议层的同步指示。
可选的，终端设备在获取到目标信号后，终端设备的第二协议层可以根据该目标信号生成同步 指示或不同步指示，并将该同步指示或不同步指示发送给第一协议层。
具体地，该第一协议层和第二协议层可以是终端设备中的实体模块，第一协议层为第一模块，第二协议层为第二模块。
一种可能的实现方式中，终端设备的第二模块(第二协议层)生成同步指示或不同步指示包括下述步骤：
a、第二模块先测量获取到的目标信号的信号与干扰加噪声比(signal to interference plus noise ratio，SINR)；
b、第二模块根据该目标信号的SINR确定该目标信号的误块率(block error rate，BLER)；
C、若该目标信号的误块率小于阈值k，第二模块生成对应的同步指示，该同步指示可以反映出目标小区与终端设备之间可能具有较好的通信质量，并将该同步指示传输给第一模块。若该目标信号的误块率大于或等于阈值k，则不生成同步指示，或者第二模块生成对应的不同步指示，并将该不同步指示传输给第一模块，该不同步指示可以反映出目标小区与终端设备之间可能具有较差的通信质量。
本申请实施例中，目标小区的信号质量越好，终端设备获取到的目标信号的误块率就越低。相应地，终端设备生成的同步指示就越多，不同步指示就越少。可以理解的是，在目标接入网设备发送的目标信号的数量不变的情况下，终端设备的第一协议层收到的同步指示的数量随着目标小区的信号质量提升而提升，因此终端设备可以根据第一协议层收到的同步指示的数量衡量目标小区的信号质量，从而确定目标小区是否可以被选为可驻留小区。
本申请实施例中，该第一协议层和第二协议层都属于终端设备的协议层级，第一协议层的层级高于第二协议层。终端设备的协议层级可以包括无线资源控制层(radio resource control，RRC)、媒体接入控制子层(medium access control，MAC)和物理层(physical layer，PHY)等协议层级。其中包括上述第一协议层和第二协议层，例如第一协议层可以是RRC层，第二协议层可以是PHY层。也可以是其他两个层级，具体此处不做限定。
本申请实施例中，终端设备测量目标信号的SINR的测量周期可以与参考信号相关，该参考信号可以是Beacon和同步信号等信号。例如终端设备可以根据协议或广播消息的指示，确定终端设备的测量周期为N个周期，N为大于等于1的整数。
803、终端设备确定第一协议层连续成功接收来自第二协议层的同步指示的数量。
终端设备确定第一协议层连续成功接收来自第二协议层的同步指示的数量。
本申请实施例中，一种实现方式，终端设备可以确定在某个时间内第一协议层连续接收到的同步指示和不同步指示的数量；另一种实现方式，由于终端设备的同步指示与目标信号是一一对应的，在步骤801对限制在一定时间内获取目标信号时，无需额外对同步指示和不同步指示进行时间上的限定。
判断是否连续成功接收的实现方式与步骤502所述相似，具体此处不再赘述。
804、终端设备确定目标小区是否为可驻留小区。
一种实现方式，当终端设备确定第一协议层连续成功接收到第二协议层传输的同步指示的个数大于阈值e，即终端设备确定连续成功获取的同步指示的数量满足终端设备的小区选择准则的要求，则终端设备可以确定目标小区为可驻留小区，该可驻留小区为满足终端设备小区选择准则的要求的小区，终端设备可以选择该目标小区进行通信。
另一种实现方式，当终端设备确定第一协议层连续成功接收到的不同步指示的个数大于阈值e，或终端设备确定第一协议层连续成功接收到的第二协议层传输的同步指示的个数小于或等于阈值e后，即终端设备确定，终端设备连续成功获取的同步指示的数量并不满足终端设备的小区选择准则的要求，终端设备可以确定目标小区为不可驻留小区，不可驻留小区为不满足终端设备的小区选择准则要求的小区，终端设备不可以选择该目标小区进行通信。
一种实现方式中，终端设备确定第一协议层连续成功接收到来自第二协议层的同步指示的数量大于阈值e时，终端设备确定目标小区满足终端设备的小区选择准则。可以理解的是，本实施例中的小区选择准则即为第一协议层连续成功接收到来自第二协议层的同步指示的数量大于阈值e。
具体地，终端设备确定第一协议层连续成功接收到来自第二协议层的d个同步指示，d大于阈值e，阈值e为终端设备的小区选择准则的要求的阈值。也就是说，终端设备连续成功获取的同步指示的个数d大于小区选择准则要求的阈值e时，终端设备就可以确定目标小区满足终端设备的小 区选择准则。
另一种实现方式中，终端设备确定第一协议层连续成功接收到来自第二协议层的同步指示的数量小于或等于阈值e时，终端设备确定目标小区不满足终端设备的小区选择准则。
具体地，终端设备确定第一协议层连续成功接收到的第二协议层传输的同步指示的个数小于或等于阈值e，或终端设备确定第一协议层连续成功接收到的不同步指示的个数大于阈值e，阈值e为终端设备的小区选择准则的要求的阈值。也就是说，终端设备连续成功获取的同步指示的个数小于或等于小区选择准则要求的阈值e时，或者终端设备连续成功获取的不同步指示的个数大于小区选择准则要求的阈值e时，终端设备就可以确定目标小区满足终端设备的小区选择准则。
本申请实施例中，该阈值e可以是预设的，也可以是终端设备配置的，也可以是目标小区配置的，例如目标小区可以在目标信号中携带该阈值e，具体此处不作限定。
可选的，在一些实施场景下，如图9所示，该方法还可以包括下述步骤805：
805、在终端设备确定目标小区为不可驻留小区后，终端设备对目标小区作为可驻留小区增加限制条件。
在一些情况下，可以对当前不满足小区选择或者无法正常工作的小区增加限制条件，比如步骤505的情况。终端设备驻留在目标小区后，确定终端设备为非正常工作状态后，在重新选择小区时，也可以对目标小区增加限制条件。
在目标小区并不满足终端设备的小区选择准则情况下，终端设备确定目标小区为不可驻留小区后，可以重新选择小区作为可驻留小区，在重新选择小区时，终端设备可以对目标小区作为可驻留小区增加限制条件。
一种可能的实现方式中，在终端设备确定目标小区为不可驻留小区后，终端设备在T3时间内不可以选择目标小区为可驻留小区。
一种可能的实现方式中，若终端设备确定在时间T2内接收到的同步指示的个数大于阈值f，则终端设备可以重新确定目标小区为可驻留小区，阈值f大于阈值e。
具体地，终端设备在确定目标小区为不可驻留小区后，可以重新选择可驻留小区。在重新选择可驻留小区时，终端设备会向目标小区增加限制条件，在确定第一协议层连续成功接收到的不同步指示的个数是否满足小区选择准则时，目标小区的目标信号的数量需要大于阈值f才可以重新确定为可驻留小区，阈值f大于阈值e。而在确定其他小区是否可作为可驻留小区时，可以根据阈值e进行选择。
上述列举了两种可实现的限制条件，也可以是其他限制条件，具体此处不做限定，
本申请实施例中，终端设备为再次确定目标小区为可驻留小区增加了限制条件，避免了短时间内终端设备再次选择到信号质量未改变的目标小区，从而提高小区选择效率。
一种可能的实现方式中，若终端设备确定第一协议层连续成功接收到第二协议层传输的同步指示的个数大于阈值l，则终端设备可以重新确定目标小区为可驻留小区，阈值l小于阈值e。
本申请实施例提供的小区选择方法，在终端设备重新确定可驻留小区时，终端设备放松了小区选择准则的要求，避免终端始终搜索不到满足小区选择准则条件的小区。
可选的，在一些实施场景下，如图9所示，终端设备确定目标小区为可驻留小区后，该方法还可以包括下述步骤：
806、终端设备驻留在目标小区后，确定终端设备为非正常工作状态。
具体步骤与上述实施例一中的步骤505类似，具体此处不再赘述。
807、终端设备重新选择小区。
具体步骤与上述实施例一中的步骤506类似，具体此处不再赘述。
本申请实施例中，目标小区可以通过目标信号配置终端设备选择小区的阈值等信息。具体地，当目标信号是系统消息、同步信号和寻呼消息时，目标信号可以携带/包括上述时间T2、时间T3、时间T4、阈值k、阈值e和阈值f中的至少一项。
如图10所示，为本申请实施例提供的另一种小区选择方法，该小区选择方法包括如下步骤：
1001、终端设备获取目标小区的目标信号。
具体步骤与上述实施例一中的步骤501类似，具体此处不再赘述。
1002、终端设备根据目标信号的信号质量确定目标小区的目标小区选择值。
本申请实施例中，终端设备根据目标信号的信号质量确定目标小区的目标小区选择值可以包括 以下步骤：
a、终端设备测量目标信号的RSRP；
b、终端设备将目标信号的RSRP减去阈值g确定为目标小区的目标小区选择值。其中，阈值g为目标小区中要求的最小接收水平。
本申请实施例中，目标小区要求的最小接收水平与终端设备的类型相关。例如，当终端设备的类型为标签时，对于不同类型的标签，目标小区要求的最小接收水平不同。例如有源标签、主动标签(active),无源标签和半无源标签的功率水平不同，因此最小接收强度也不同。具体如图11所示，通常有源标签的功率最大，标签覆盖范围也最大，相应的，最小接收强度越高；半有源标签的功率和标签覆盖范围次之，相应的，最小接收强度较高；无源标签的功率最小，标签覆盖范围也最小，相应的，最小接收强度最低。
另一种实现方式中，阈值g也可以是最小接收水平阈值与其他参数之和，其他参数可以为建立连接失败而产生的临时偏移量和/或小区选择优先级相关的参数，其中，小区选择优先级也可以。
本申请实施例中，该阈值g可以是预设的，可以是协议规定的，也可以是终端设备配置的，也可以是目标小区配置的，例如目标小区可以在目标信号中携带该阈值g，具体此处不作限定。不同标签类型阈值g不同，具体可以定义多个阈值，或者目标小区配置多个阈值。也可以不同类型的标签对应的阈值，通过添加不同的偏置量来表示最小电平差异。
可选的，信号质量可以通过RSRS表示。也可以通过其他参数表示，例如RSRQ等参数，本申请对此不作具体限定。
本申请实施例中，终端设备测量目标信号的RSRP或RSRQ的测量周期可以与参考信号相关，该参考信号可以是Beacon和同步信号等信号。例如终端设备可以根据协议或广播消息的指示，确定终端设备的测量周期为N个周期，N为大于等于1的整数。
1003、终端设备确定目标小区是否为可驻留小区。
一种可能的实现方式中，当终端设备确定目标小区的目标小区质量满足小区准则要求后，比如S准则，即目标小区的目标小区选择值满足终端设备的小区选择准则后，终端设备确定目标小区为可驻留小区，该可驻留小区为满足终端设备小区选择准则的小区，终端设备可以选择该目标小区进行通信。可以理解的是，本实施例中的小区选择准则即为目标小区的目标小区选择值大于零。
另一种可能的实现方式中，当终端设备确定目标小区的目标小区选择值小于零后，即终端设备确定目标小区的目标小区选择值并不满足终端设备的小区选择准则，终端设备可以确定目标小区为不可驻留小区，不可驻留小区为不满足终端设备的小区选择准则要求的小区，终端设备不可以选择该目标小区进行通信。
可选的，在一些实施场景下，如图12所示，该方法还可以包括下述步骤1004：
1004、在终端设备确定目标小区为不可驻留小区后，终端设备对目标小区作为可驻留小区增加限制条件。
在目标小区并不满足终端设备的小区选择准则情况下，终端设备确定目标小区为不可驻留小区后，可以重新选择小区作为可驻留小区，在重新选择小区时，终端设备可以对目标小区作为可驻留小区增加限制条件。
在一些情况下，可以对当前不满足小区选择或者无法正常工作的小区增加限制条件，比如步骤505的情况。终端设备驻留在目标小区后，确定终端设备为非正常工作状态后，在重新选择小区时，也可以对目标小区增加限制条件。
一种可能的实现方式中，在终端设备确定目标小区为不可驻留小区后，终端设备在T3时间内不可以选择目标小区为可驻留小区。
一种可能的实现方式中，若终端设备确定在时间T2内目标小区的目标小区选择值大于阈值h，则终端设备可以重新确定目标小区为可驻留小区，阈值h大于零。
具体地，终端设备在确定目标小区为不可驻留小区后，可以重新选择可驻留小区。在重新选择可驻留小区时，终端设备可以对目标小区作为可驻留小区增加限制条件，在确定目标小区的目标小区选择值是否满足小区选择准则时，目标小区的目标小区选择值需要大于阈值h才可以重新确定为可驻留小区，阈值h大于零。而在确定其他小区是否可作为可驻留小区时，只需确定小区的目标小区选择值大于零，既可以确定为可驻留小区。
上述列举了两种可实现的限制条件，也可以是其他限制条件，具体此处不做限定，
本申请实施例中，终端设备为再次确定目标小区为可驻留小区增加了限制条件，避免了短时间内终端设备再次选择到信号质量未改变的目标小区，从而提高小区选择效率。
一种可能的实现方式中，若终端设备确定目标小区的目标小区选择值大于阈值w，则终端设备可以重新确定目标小区为可驻留小区，阈值w小于零。
本申请实施例提供的小区选择方法，在终端设备重新确定可驻留小区时，终端设备放松了小区选择准则的要求，避免终端始终搜索不到满足小区选择准则条件的小区。
可选的，在一些实施场景下，如图12所示，终端设备确定目标小区为可驻留小区后，该方法还可以包括下述步骤：
1005、终端设备驻留在目标小区后，确定终端设备为非正常工作状态。
具体步骤与上述实施例一中的步骤505类似，具体此处不再赘述。
1006、终端设备重新选择小区。
具体步骤与上述实施例一中的步骤506类似，具体此处不再赘述。
本申请实施例中，目标小区可以通过目标信号配置终端设备选择小区的阈值等信息。具体地，当目标信号是系统消息、同步信号和寻呼消息时，目标信号可以携带/包括上述时间T2、时间T3、时间T4、阈值g和阈值h中的至少一项。
可以理解的是，该终端设备为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法实施例对终端设备进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
可选的，具体实现时，终端设备可以采用图13所示的组成结构，或者包括图13所示的部件，本申请实施例中也可以采用图13所示的组成结构，或者包括图13所示的部件，图13为本申请提供的一种通信装置1300的组成示意图，该通信装置1300可以为终端设备中的芯片或者片上系统；或者，可以为终端设备中的模块或芯片或片上系统。
如图13所示，该通信装置1300包括至少一个处理器1301，以及至少一个通信接口(图13中仅是示例性的以包括一个通信接口1304，以及一个处理器1301为例进行说明)。可选的，该通信装置1300还可以包括通信总线1302和存储器1303。
处理器1301可以是一个通用中央处理器(central processing unit，CPU)、通用处理器、网络处理器(network processor，NP)、数字信号处理器(digital signal processing，DSP)、微处理器、微控制器、可编程逻辑器件(programmable logic device，PLD)或它们的任意组合。处理器1301还可以是其它具有处理功能的装置，例如电路、器件或软件模块，不予限制。
通信总线1302用于连接通信装置1300中的不同组件，使得不同组件可以通信。通信总线1302可以是外设部件互连标准(peripheral component interconnect，PCI)总线或扩展工业标准结构(extended industry standard architecture，EISA)总线等。该总线可以分为地址总线、数据总线、控制总线等。为便于表示，图13中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
通信接口1304，用于与其他设备或通信网络通信。示例性的，通信接口1304可以模块、电路、收发器或者任何能够实现通信的装置。可选的，通信接口1304也可以是位于处理器1301内的输入输出接口，用以实现处理器的信号输入和信号输出。
存储器1303，可以是具有存储功能的装置，用于存储指令和/或数据。其中，指令可以是计算机程序。
示例性的，存储器1303可以是只读存储器(read-only memory，ROM)或可存储静态信息和/或指令的其他类型的静态存储设备，也可以是随机存取存储器(random access memory，RAM)或可存储信息和/或指令的其他类型的动态存储设备，还可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory， CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或其他磁存储设备等，不予限制。
需要指出的是，存储器1303可以独立于处理器1301存在，也可以和处理器1301集成在一起。存储器1303可以位于通信装置1300内，也可以位于通信装置1300外，不予限制。处理器1301，可以用于执行存储器1303中存储的指令，以实现本申请下述实施例提供的方法。
作为一种可选的实现方式，通信装置1300还可以包括输出设备1305和输入设备1306。输出设备1305和处理器1301通信，可以以多种方式来显示信息。例如，输出设备1305可以是液晶显示器(liquid crystal display，LCD)，发光二极管(light emitting diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备1306和处理器1301通信，可以以多种方式接收用户的输入。例如，输入设备1306可以是鼠标、键盘、触摸屏设备或传感设备等。
需要说明的是，图13所示的结构并不构成对终端设备的具体限定。比如，在本申请另一些实施例中，终端设备可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
可选的，以通信装置为上述方法实施例中的终端设备为例，图14示出了一种终端设备1400的结构示意图。该终端设备1400包括处理模块1401和收发模块1402。
在一些实施例中，该终端设备1400还可以包括存储模块(图14中未示出)，用于存储程序指令和数据。
在一些实施例中，收发模块1402，也可以称为收发单元用以实现发送和/或接收功能。该收发模块1402可以由收发电路，收发机，收发器或者通信接口构成。
在一些实施例中，收发模块1402，可以包括接收模块和发送模块，分别用于执行上述方法实施例中由终端设备执行的接收和发送类的步骤，和/或用于支持本文所描述的技术的其它过程；处理模块1401，可以用于执行上述方法实施例中由终端设备执行的处理类(例如确定、生成等)的步骤，和/或用于支持本文所描述的技术的其它过程。
在一种可能的设计中：
处理模块1401，用于通过收发模块1402获取目标小区的目标信号；
处理模块1401，还用于在终端设备连续成功获取a个目标信号的情况下，确定目标小区为可驻留小区，a为大于阈值b的正整数，可驻留小区为满足终端设备的小区选择准则要求的小区；或者
处理模块1401，还用于在终端设备连续成功获取的目标信号的数量小于或等于阈值b的情况下，确定目标小区为不可驻留小区，不可驻留小区为不满足终端设备的小区选择准则要求的小区。
可选地，终端设备连续成功获取a个目标信号包括：终端设备在时间T1内连续成功获取a个目标信号；或者终端设备连续成功获取的目标信号的数量小于或等于阈值b包括：终端设备在时间T1内连续成功获取的目标信号的数量小于或等于阈值b。
可选地，处理模块1401，还用于在终端设备确定目标小区为不可驻留小区之后，在时间T2内连续成功获取的目标信号的个数大于阈值c的情况下，重新确定目标小区为可驻留小区，阈值c大于阈值b；或
可选地，处理模块1401，还用于在终端设备确定目标小区为不可驻留小区之后，在T3时间内不选择目标小区作为可驻留小区。
可选地，处理模块1401，还用于在终端设备确定目标小区为可驻留小区之后，若第一条件满足，确定终端设备为非正常工作状态，并且终端设备重新确定可驻留小区。
可选地，第一条件包括以下至少一项：终端设备未连续成功接收目标信号的次数大于m；终端设备确定随机接入失败的次数大于n；终端设备确定数据传输失败的次数大于s；终端设备确定时间T4内获取到的数据的误块率大于t。
可选地，目标信号包括信标、同步信号、寻呼信号、系统消息和下行数据中的至少一项。
在另一种可能的设计中：
处理模块1401，用于通过收发模块1402获取目标小区的目标信号，目标信号用于生成同步指示；
处理模块1401，还用于在终端设备的第一协议层连续成功获取来自第二协议层的d个同步指示的情况下，确定目标小区为可驻留小区，d为大于阈值e的正整数，终端设备的协议层级包括第一 协议层和第二协议层，第一协议层高于第二协议层；或者
处理模块1401，还用于在终端设备的第一协议层连续成功获取到来自第二协议层的同步指示的个数小于或等于阈值e情况下，或在终端设备的第一协议层连续成功获取到来自第二协议层的不同步指示的个数大于阈值e的情况下，确定目标小区为不可驻留小区，不可驻留小区为不满足终端设备的小区选择准则要求的小区。
可选地，处理模块1401，还用于在终端设备确定目标小区为不可驻留小区之后，在时间T2内终端设备的第一协议层连续成功接收到来自第二协议层的同步指示的个数大于阈值f的情况下，重新确定目标小区为可驻留小区，阈值f大于阈值e；或
可选地，处理模块1401，还用于在终端设备确定目标小区为不可驻留小区之后，在T3时间内不选择目标小区作为可驻留小区。
可选地，处理模块1401，还用于在终端设备确定目标小区为可驻留小区之后，若第一条件满足，确定终端设备为非正常工作状态，并且终端设备重新确定可驻留小区。
可选地，第一条件包括以下至少一项：终端设备未连续成功接收到目标信号的次数大于m；终端设备确定随机接入信道失败的次数大于n；终端设备确定数据传输失败的次数大于s；终端设备确定时间T4内获取到的数据的误块率大于t。
可选地，目标信号包括信标、同步信号、寻呼信号、系统消息和下行数据中的至少一项。
在又一种可能的设计中：
处理模块1401，用于通过收发模块1402获取目标小区的目标信号；
处理模块1401，还用于根据目标信号的信号质量确定目标小区的目标小区选择值；
处理模块1401，还用于在目标小区的目标小区选择值大于零的情况下，确定目标小区为可驻留小区，可驻留小区为满足终端设备的小区选择准则要求的小区；或者
处理模块1401，还用于在目标小区的目标小区选择值小于或等于零的情况下，确定目标小区为不可驻留小区，不可驻留小区为不满足终端设备的小区选择准则要求的小区。
可选地，目标小区的目标小区选择值为目标信号的信号质量减去阈值g，阈值g为终端设备的最小接收水平。
可选地，处理模块1401，还用于在终端设备确定目标小区为不可驻留小区之后，在时间T2内目标小区的目标小区选择值大于阈值h的情况下，重新确定目标小区为可驻留小区，阈值h大于零；或
可选地，处理模块1401，还用于在终端设备确定目标小区为不可驻留小区之后，在T3时间内不选择目标小区为作可驻留小区。
可选地，处理模块1401，还用于在终端设备确定目标小区为可驻留小区之后，若第一条件满足，终端设备确定终端设备为非正常工作状态，并且终端设备重新确定可驻留小区。
可选地，第一条件包括以下至少一项：终端设备未连续成功接收到目标信号的次数大于m；终端设备确定随机接入信道失败的次数大于n；终端设备确定数据传输失败的次数大于s；终端设备确定时间T4内获取到的数据的误块率大于t。
可选地，目标信号包括信标、同步信号、寻呼信号、系统消息和下行数据中的至少一项。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
可选的，本申请中，处理模块通过收发模块接收/发送信息，也可以理解为：处理模块控制收发模块接收/发送信息。或者，处理模块通过收发模块发送信息，可以理解为：处理模块向收发模块输出信息，由收发模块发送该信息；处理模块通过收发模块接收信息，可以理解为：收发模块接收信息，并向处理模块输入该信息。
在本申请中，该终端设备1400以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定专用集成电路(application-specific integrated circuit，ASIC)，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。
在一些实施例中，在硬件实现上，本领域的技术人员可以想到该终端设备1400可以采用图11所示的通信装置1100的形式。
作为一种示例，图14中的处理模块1401的功能/实现过程可以通过图13所示的通信装置1300中的处理器1301调用存储器1303中存储的计算机执行指令来实现。图14中的收发模块1402的功 能/实现过程可以通过图13所示的通信装置1300中的通信接口1304来实现。
在一些实施例中，当图14中的终端设备1400是芯片或芯片系统时，收发模块1402的功能/实现过程可以通过芯片或芯片系统的输入输出接口(或通信接口)实现，处理模块1401的功能/实现过程可以通过芯片或芯片系统的处理器(或者处理电路)实现。
由于本实施例提供的终端设备1400可执行上述方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
作为一种可能的产品形态，本申请实施例的终端设备，可以使用下述来实现：一个或多个现场可编程门阵列(field programmable gate array，FPGA)、可编程逻辑器件(programmable logic device，PLD)、控制器、状态机、门逻辑、分立硬件部件、任何其它适合的电路、或者能够执行本申请通篇所描述的各种功能的电路的任意组合。
在一些实施例中，本申请实施例还提供一种通信装置，该通信装置包括处理器，用于实现上述任一方法实施例中的方法。
作为一种可能的实现方式，该通信装置还包括存储器。该存储器，用于保存必要的计算机程序和数据。该计算机程序可以包括指令，处理器可以调用存储器中存储的计算机程序中的指令以指令该通信装置执行上述任一方法实施例中的方法。当然，存储器也可以不在该通信装置中。
作为另一种可能的实现方式，该通信装置还包括接口电路，该接口电路为代码/数据读写接口电路，该接口电路用于接收计算机执行指令(计算机执行指令存储在存储器中，可能直接从存储器读取，或可能经过其他器件)并传输至该处理器。
作为又一种可能的实现方式，该通信装置还包括通信接口，该通信接口用于与该通信装置之外的模块通信。
可以理解的是，该通信装置可以是芯片或芯片系统，该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
本申请还提供了一种计算机可读存储介质，其上存储有计算机程序或指令，该计算机程序或指令被计算机执行时实现上述任一方法实施例的功能。
本申请还提供了一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例的功能。
本领域普通技术人员可以理解，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
可以理解，本申请中描述的系统、装置和方法也可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，即可以位于一个地方，或者也可以分布到多个网络单元上。作为单元显示的部件可以是或者也可以不是物理单元。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，本申请实施例所述的全部或部分流程(或功能)被实现。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。本申请实施例 中,计算机可以包括前面所述的装置。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。

Claims (23)

  1. 一种小区选择方法，其特征在于，所述方法包括：
    终端设备获取目标小区的目标信号；
    在所述终端设备连续成功获取a个所述目标信号的情况下，所述终端设备确定所述目标小区为可驻留小区，所述a为大于阈值b的正整数，所述可驻留小区为满足所述终端设备的小区选择准则要求的小区；或者
    在所述终端设备连续成功获取的所述目标信号的数量小于或等于阈值b的情况下，所述终端设备确定所述目标小区为不可驻留小区，所述不可驻留小区为不满足所述终端设备的小区选择准则要求的小区。
  2. 根据权利要求1所述的方法，其特征在于，所述终端设备连续成功获取a个所述目标信号，包括：
    所述终端设备在时间T1内连续成功获取a个所述目标信号；或者
    所述终端设备连续成功获取的所述目标信号的数量小于或等于阈值b，包括：
    所述终端设备在时间T1内连续成功获取的所述目标信号的数量小于或等于阈值b。
  3. 根据权利要求1或2所述的方法，其特征在于，在所述终端设备确定所述目标小区为不可驻留小区之后，所述方法还包括：
    在时间T2内连续成功获取的目标信号的个数大于阈值c的情况下，所述终端设备重新确定所述目标小区为可驻留小区，所述阈值c大于阈值b；或
    在所述终端设备确定所述目标小区为不可驻留小区之后，所述方法还包括：
    所述终端设备在T3时间内不选择所述目标小区作为可驻留小区。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，在所述终端设备确定所述目标小区为可驻留小区之后，所述方法还包括：
    若第一条件满足，所述终端设备确定所述终端设备为非正常工作状态，并且所述终端设备重新确定可驻留小区。
  5. 根据权利要求4所述的方法，其特征在于，所述第一条件包括以下至少一项：
    所述终端设备未连续成功接收所述目标信号的次数大于m；
    所述终端设备确定随机接入失败的次数大于n；
    所述终端设备确定数据传输失败的次数大于s；
    所述终端设备确定时间T4内获取到的数据的误块率大于t。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述目标信号包括信标、参考信号、同步信号、寻呼信号、系统消息和下行数据中的至少一项。
  7. 一种小区选择方法，其特征在于，所述方法包括：
    终端设备获取目标小区的目标信号，所述目标信号用于生成同步指示；
    在所述终端设备的第一协议层连续成功获取来自第二协议层的d个所述同步指示的情况下，所述终端设备确定所述目标小区为可驻留小区，所述d为大于阈值e的正整数，所述终端设备的协议层级包括所述第一协议层和所述第二协议层，所述第一协议层高于所述第二协议层；或者
    在所述终端设备的第一协议层连续成功获取到来自第二协议层的同步指示的个数小于或等于阈值e情况下，或在所述终端设备的第一协议层连续成功获取到来自第二协议层的不同步指示的个数大于阈值e的情况下，所述终端设备确定所述目标小区为不可驻留小区，所述不可驻留小区为不满足所述终端设备的小区选择准则要求的小区。
  8. 根据权利要求7所述的方法，其特征在于，在所述终端设备确定所述目标小区为不可驻留小区之后，所述方法还包括：
    在时间T2内所述终端设备的第一协议层连续成功接收到来自第二协议层的同步指示的个数大于阈值f的情况下，所述终端设备重新确定所述目标小区为可驻留小区，所述阈值f大于所述阈值e；或
    在所述终端设备确定所述目标小区为不可驻留小区之后，所述方法还包括：
    所述终端设备在T3时间内不选择所述目标小区作为可驻留小区。
  9. 根据权利要求7或8所述的方法，其特征在于，在所述终端设备确定所述目标小区为可驻留小区之后，所述方法还包括：
    若第一条件满足，所述终端设备确定所述终端设备为非正常工作状态，并且所述终端设备重新确定可驻留小区。
  10. 根据权利要求9所述的方法，其特征在于，所述第一条件包括以下至少一项：
    所述终端设备未连续成功接收到所述目标信号的次数大于m；
    所述终端设备确定随机接入信道失败的次数大于n；
    所述终端设备确定数据传输失败的次数大于s；
    所述终端设备确定时间T4内获取到的数据的误块率大于t。
  11. 根据权利要求7-10任一项所述的方法，其特征在于，所述目标信号包括信标、参考信号、同步信号、寻呼信号、系统消息和下行数据中的至少一项。
  12. 一种小区选择方法，其特征在于，所述方法包括：
    终端设备获取目标小区的目标信号；
    所述终端设备根据所述目标信号的信号质量确定所述目标小区的目标小区选择值；
    在所述目标小区的目标小区选择值大于零的情况下，所述终端设备确定所述目标小区为可驻留小区，所述可驻留小区为满足所述终端设备的小区选择准则要求的小区；或者
    在所述目标小区的目标小区选择值小于或等于零的情况下，所述终端设备确定所述目标小区为不可驻留小区，所述不可驻留小区为不满足所述终端设备的小区选择准则要求的小区。
  13. 根据权利要求12所述的方法，其特征在于，所述目标小区的目标小区选择值为所述目标信号的信号质量减去阈值g，所述阈值g为所述终端设备的最小接收水平。
  14. 根据权利要求12或13所述的方法，其特征在于，在所述终端设备确定所述目标小区为不可驻留小区之后，所述方法还包括：
    在时间T2内所述目标小区的目标小区选择值大于阈值h的情况下，所述终端设备重新确定所述目标小区为可驻留小区，所述阈值h大于零；或
    在所述终端设备确定所述目标小区为不可驻留小区之后，所述方法还包括：
    所述终端设备在T3时间内不选择所述目标小区为作可驻留小区。
  15. 根据权利要求12-14任一项所述的方法，其特征在于，在所述终端设备确定所述目标小区为可驻留小区之后，所述方法还包括：
    若第一条件满足，所述终端设备确定所述终端设备为非正常工作状态，并且所述终端设备重新确定可驻留小区。
  16. 根据权利要求15所述的方法，其特征在于，所述第一条件包括以下至少一项：
    所述终端设备未连续成功接收到所述目标信号的次数大于m；
    所述终端设备确定随机接入信道失败的次数大于n；
    所述终端设备确定数据传输失败的次数大于s；
    所述终端设备确定时间T4内获取到的数据的误块率大于t。
  17. 根据权利要求12-16任一项所述的方法，其特征在于，所述目标信号包括信标、参考信号、同步信号、寻呼信号、系统消息和下行数据中的至少一项。
  18. 一种通信装置，其特征在于，所述通信装置包括：处理模块和收发模块；
    所述处理模块，用于通过所述收发模块获取目标小区的目标信号；
    所述处理模块，还用于在所述终端设备连续成功获取a个所述目标信号的情况下，确定所述目标小区为可驻留小区，所述a为大于阈值b的正整数，所述可驻留小区为满足所述终端设备的小区选择准则要求的小区；或者在所述终端设备连续成功获取的所述目标信号的数量小于或等于阈值b的情况下，确定所述目标小区为不可驻留小区，所述不可驻留小区为不满足所述终端设备的小区选择准则要求的小区。
  19. 一种通信装置，其特征在于，所述通信装置包括：处理模块和收发模块；
    所述处理模块，用于通过所述收发模块获取目标小区的目标信号，所述目标信号用于生成同步指示；
    所述处理模块，还用于在所述终端设备的第一协议层连续成功获取来自第二协议层的d个所述同步指示的情况下，所述终端设备确定所述目标小区为可驻留小区，所述d为大于阈值e的正整数，所述终端设备的网络层级包括所述第一协议层和所述第二协议层，所述第一协议层高于所述第二协议层；或者在所述终端设备的第一协议层连续成功获取到来自第二协议层的同步指示的个数小于或等于阈值e情况下，或在所述终端设备的第一协议层连续成功获取到来自第二协议层的不同步指示的个数大于阈值e的情况下，所述终端设备确定所述目标小区为不可驻留小区，所述不可驻留小区为不满足所述终端设备的小区选择准则要求的小区。
  20. 一种通信装置，其特征在于，所述通信装置包括：处理模块和收发模块；
    所述处理模块，用于通过所述收发模块获取目标小区的目标信号；
    所述处理模块，还用于根据所述目标信号的信号质量确定所述目标小区的目标小区选择值；
    所述处理模块，还用于在所述目标小区的目标小区选择值大于零的情况下，确定所述目标小区为可驻留小区，所述可驻留小区为满足所述终端设备的小区选择准则要求的小区；或者在所述目标小区的目标小区选择值小于或等于零的情况下，确定所述目标小区为不可驻留小区，所述不可驻留小区为不满足所述终端设备的小区选择准则要求的小区。
  21. 一种通信装置，其特征在于，所述通信装置包括处理器；所述处理器，用于运行计算机程序或指令，以使所述通信装置执行如权利要求1-6任一项所述的方法，或者，以使所述通信装置执行如权利要求7-11任一项所述的方法，或者，以使所述通信装置执行如权利要求12-17任一项所述的方法。
  22. 一种计算机可读存储介质，其特征在于，计算机可读存储介质存储有计算机指令或程序，当计算机指令或程序在计算机上运行时，使得如权利要求1-6任一项所述的方法被执行，或者，使得如权利要求7-11任一项所述的方法被执行，或者，以使所述通信装置执行如权利要求12-17任一项所述的方法。
  23. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机指令；当部分或全部所述计算机指令在计算机上运行时，使得如权利要求1-6任一项所述的方法被执行，或者，使得如权利要求7-11任一项所述的方法被执行，或者，使得如权利要求12-17任一项所述的方法被执行。
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111567086A (zh) * 2018-01-10 2020-08-21 Oppo广东移动通信有限公司 无线通信的方法、终端设备和网络设备
CN112690022A (zh) * 2020-12-17 2021-04-20 北京小米移动软件有限公司 一种接入控制方法、接入控制装置及存储介质
CN114830737A (zh) * 2019-12-09 2022-07-29 瑞典爱立信有限公司 用于使减少带宽的无线设备能够接入小区的方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111567086A (zh) * 2018-01-10 2020-08-21 Oppo广东移动通信有限公司 无线通信的方法、终端设备和网络设备
CN114830737A (zh) * 2019-12-09 2022-07-29 瑞典爱立信有限公司 用于使减少带宽的无线设备能够接入小区的方法
CN112690022A (zh) * 2020-12-17 2021-04-20 北京小米移动软件有限公司 一种接入控制方法、接入控制装置及存储介质

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