WO2018152735A1

WO2018152735A1 - Cell searching method and apparatus

Info

Publication number: WO2018152735A1
Application number: PCT/CN2017/074557
Authority: WO
Inventors: 董雪峰
Original assignee: 华为技术有限公司
Priority date: 2017-02-23
Filing date: 2017-02-23
Publication date: 2018-08-30

Abstract

A cell searching method and apparatus, used for solving the problem in the prior art of longer average time required for cell search. The method comprises: a terminal receives N neighbor cell lists and grouping instruction information sent by a base station, the grouping instruction information instructing a value range of the distance between at least one neighbor cell in each neighbor cell list and the base station or instructing a value range of the receiving strength, for a reference signal sent by the base station, of the at least one neighbor cell in each neighbor cell list; the terminal obtains a grouping parameter value, the grouping parameter value being the receiving strength value obtained by measuring the reference signal, sent by the base station, by the terminal or being the distance between the terminal and the base station; the terminal determines a target neighbor cell list in the N neighbor cell lists according to the grouping parameter value and grouping instruction information; and the terminal separately searches a neighbor cell corresponding to a cell identifier of the at least one neighbor cell comprised in the target neighbor cell list. Therefore, the average time required by cell search is effectively reduced.

Description

Method and device for cell search

Technical field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for cell search.

Background technique

A neighboring cell refers to two cells that are overlapped and are provided with a reselection or handover relationship, wherein one cell may have multiple neighboring cells. In a nutshell, the function of the neighboring cell is to enable the terminal to perform smooth transition of services between neighboring cells in the mobile state, and to ensure that services are not interrupted. As shown in FIG. 1, the neighboring cells corresponding to the cell (CELL) A are CELL B and CELL C. Therefore, since the cell in which the terminal is located has multiple neighboring cells, the terminal can implement switching and reselection between different networks.

Further, in order to implement cell handover and cell reselection, the terminal needs to perform a cell search process. Specifically, the cell search process refers to the neighboring cell information configured by the network side device in the system or the different system networking. A process in which a neighboring cell of a different system searches to determine a candidate cell for cell handover or cell reselection. The neighbor cell information configured by the network side device may include the same-frequency neighbor cell information of the system, the inter-frequency neighbor cell information of the system, and the neighbor system information of the different system.

Specifically, as shown in Table 1, the neighboring cell information is searched according to the cell identifier of each neighboring cell in the neighboring cell information, until the candidate cell of the cell handover or the cell reselection is determined.

Table 1

A problem with the existing cell search process is that the average time required to complete a cell search is longer.

Summary of the invention

The embodiment of the present invention provides a method and a device for cell search, which are used to solve the problem that the average time required for cell search in the prior art is long.

In a first aspect, the embodiment of the present application provides a cell search method, including: receiving, by a terminal, a list of N neighbor cells and packet indication information, where the terminal acquires a packet parameter value, where the packet parameter value is a terminal measurement base station. The received strength value obtained by the transmitted reference signal, or the distance between the terminal and the base station, then the terminal determines the target neighbor cell list in the N neighbor cell list according to the group parameter value and the packet indication information, and determines the target neighbor cell The neighboring cells corresponding to the cell identifiers of the at least one neighboring cell included in the list respectively perform cell search; wherein each neighboring cell list respectively includes a cell identifier of at least one neighboring cell, and the grouping indication information indicates at least one of each neighboring cell list The value range of the distance between the neighboring cell and the base station, or the value range of the received strength of the reference signal sent by the base station in the neighboring cell list, N ≥ 2 and a positive integer. Therefore, compared with the prior art, the number of cells included in the neighbor cell list is large, and the average time required to complete the cell search is long. According to the method provided by the embodiment of the present application, the terminal receives the N neighbor cell list and the packet indication information, and according to the packet parameter value and the packet indication information, may first determine the target neighbor cell list to be searched, and then search for the target neighbor cell list to be searched. The neighboring cell corresponding to the cell identifier of each neighboring cell, since the neighboring cells are grouped at this time, the number of cells included in each neighboring cell list is small, which can effectively reduce the average time required to complete the cell search, which is extremely Improve cell search efficiency.

In one possible design, the packet indication information includes different content for different packet indication information. When the group indication information indicates a value range of the distance between the at least one neighboring cell and the base station in each of the neighboring cell lists, the grouping indication information includes: N values ranging from the N neighboring cell lists one by one, Or, N upper thresholds corresponding to the N neighbor cell lists one by one. When the packet indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the packet indication information includes: N corresponding to the N neighbor cell lists. The value range, or N lower thresholds corresponding to the N neighbor cell lists. In addition, the grouping indication information may also be given in other ways, not necessarily in the form of an upper threshold or a lower threshold. Therefore, the method provided by the embodiment of the present application is simple to implement and does not increase the system burden.

In a possible design, when the group indication information indicates a value range of the distance between the at least one neighboring cell and the base station in each neighboring cell list, the packet indication information further indicates the reference signal sent by the terminal to the base station. The receiving strength is measured to obtain a grouping parameter value; or when the grouping indication information indicates a value range of the receiving strength of the reference signal transmitted by the base station in the neighboring cell list, the grouping indication information further indicates the terminal determining The distance between the terminal and the base station obtains the packet parameter value. Therefore, when the packet indication information indicates a range of values of a distance between at least one neighboring cell and a base station in each neighboring cell list, the packet parameter value obtained by the terminal is a distance between the terminal and the base station; when the packet indication information When the value range of the received strength of the reference signal sent by the base station is determined by the at least one neighboring cell in each neighboring cell list, the packet parameter value obtained by the terminal is the received intensity value obtained by the terminal measuring the reference signal sent by the base station. In addition, the terminal may agree with the base station in advance to measure the measurement, for example, to measure the distance between the terminal and the base station or to measure the received strength of the reference signal sent by the base station. At this time, the terminal may obtain the group parameter value according to the agreed measurement rule, and the base station A neighbor cell list and packet indication information for the measurement rule are delivered.

In a possible design, when the packet parameter value is the distance between the terminal and the base station, the terminal determines the distance between the terminal and the base station through the GSP. Therefore, the method provided by the embodiment of the present application is simple to implement. In addition, the method for determining the distance between the terminal and the base station may be other methods, which is not limited herein.

In a possible design, the terminal may determine the target to-be-searched neighbor cell list in the N neighbor cell list by using the following method: the terminal compares the group parameter value with the value range corresponding to each of the N neighbor cell lists, and A neighbor cell list corresponding to a value range in which the packet parameter value falls is determined as a target neighbor cell list. Therefore, the terminal provided by the embodiment of the present application can conveniently determine the target neighbor cell list, does not increase the processing burden, and is easy to operate.

In a possible design, after the terminal determines the target to-be-searched neighbor cell list in the N neighbor cell list, the terminal determines the N-1 neighbor cell list in the N neighbor cell list except the target to-be-searched neighbor cell list. Corresponding search priorities. Therefore, when the terminal determines that the neighboring cell indicated by the target to-be-searched neighbor cell list fails to search, the method further provides a list of N-1 neighboring cells other than the target to-be-searched neighboring cell list. Performing cell search for the corresponding search priorities respectively can also achieve the purpose of reducing the average time required for cell search.

In a possible design, the terminal determines that the search priority corresponding to the N-1 neighbor cell lists other than the target to-be-searched neighbor cell list in the N neighbor cell list includes two cases: when the group indication information indicates When the distance between at least one neighboring cell and the base station in each neighbor cell list ranges, the terminal calculates N neighbor cell columns respectively. The absolute value of the difference between the upper threshold of the corresponding threshold and the value of the grouping parameter is determined according to the absolute value of the difference between the obtained upper limit of the N-1 threshold and the value of the grouping parameter, and the N-1 neighboring cell lists are respectively determined. Searching for a priority; or, when the packet indication information indicates a range of values of the received strength of the reference signal transmitted by the base station in the neighboring cell list, the terminal calculates the threshold corresponding to each of the N neighboring cell lists. The absolute value of the difference between the lower limit and the grouping parameter value is determined according to the absolute value of the difference between the obtained lower limit of the N-1 threshold and the grouping parameter value, and the search priority corresponding to the N-1 neighboring cell lists is determined. Therefore, according to the method provided by the embodiment of the present application, the terminal indicates that the content of the packet indication information is different, and the terminal obtains the respective absolute values according to the calculation, wherein the smaller neighboring cell list corresponding to the absolute value is in the N-1 neighbor cell list. The higher the search priority in .

In a second aspect, the embodiment of the present application provides a cell search method, including: acquiring, by a base station, M group parameter measurement results corresponding to M cells one by one according to cell information of M cells included in a coverage area thereof, and According to the M group parameter measurement results, the M cells are divided into N neighbor cell groups, N neighbor cell lists and packet indication information are generated, and N neighbor cell lists and packet indication information are sent to terminals in the coverage area. The j-th group parameter measurement result is a received strength value of the reference signal transmitted by the base station measured in the j-th cell or a distance between the j-th cell and the base station, and j is an arbitrary integer of 1 to M. M≥2 is a positive integer; each neighbor cell list includes a cell identifier of at least one neighboring cell, and the packet indication information indicates a range of values of a distance between at least one neighboring cell and the base station in each neighboring cell list. Or, indicating that the range of the received strength of the reference signal sent by the base station in the neighboring cell list is N ≥ 2 and is a positive integer; therefore, compared with the prior art, the neighboring cell The number of cells included in the list is large, and the average time required to complete the cell search is long. According to the method provided in this embodiment, the base station divides the M cells into N neighbor cell groups, and generates N neighbor cell lists and packets. The indication information is sent to the terminal, so that the terminal determines, according to the grouping parameter value and the grouping indication information, the target neighboring cell list to be searched, and further searches for each neighboring cell in the target to-be-searched neighboring cell list. The neighboring cell corresponding to the cell identifier of the area, since the neighboring cells are grouped at this time, the number of cells included in each neighboring cell list is small, which can effectively reduce the average time required to complete the cell search, and greatly improve the cell search. effectiveness.

In a possible design, when the group indication information indicates a range of values of a distance between at least one neighboring cell and the base station in each neighboring cell list, the grouping indication information includes: one by one with the N neighboring cell lists. The corresponding N value ranges, or N threshold upper limits corresponding to the N neighbor cell lists. Therefore, the method provided by the embodiment of the present application is simple to implement and does not increase the system burden. In a possible design, when the group indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the group indication information includes: The N value ranges corresponding to the list one by one, or the N threshold lower limits corresponding to the N neighbor cell lists one by one. Therefore, the method provided by the embodiment of the present application is simple to implement and does not increase the system burden.

In a possible design, when the group indication information indicates a value range of the distance between the at least one neighboring cell and the base station in each neighboring cell list, the packet indication information further indicates the reference signal sent by the terminal to the base station. The receiving strength is measured to obtain a grouping parameter value; or when the grouping indication information indicates a value range of the receiving strength of the reference signal transmitted by the base station in the neighboring cell list, the grouping indication information further indicates the terminal determining The distance between the terminal and the base station obtains the packet parameter value. Therefore, when the packet indication information indicates a range of values of a distance between at least one neighboring cell and a base station in each neighboring cell list, the packet parameter value obtained by the terminal is a distance between the terminal and the base station; when the packet indication information When the value range of the received strength of the reference signal sent by the base station is determined by the at least one neighboring cell in each neighboring cell list, the packet parameter value obtained by the terminal is the received intensity value obtained by the terminal measuring the reference signal sent by the base station.

In a third aspect, an embodiment of the present application provides a cell search apparatus, which is used to perform the foregoing first aspect or any possible design of the first aspect. In particular, the apparatus comprises means for performing the method of any of the above-described first aspect or any of the possible aspects of the first aspect.

In a fourth aspect, an embodiment of the present application provides a cell search apparatus, for performing the method of any of the foregoing second aspect or the second aspect. In particular, the apparatus comprises means for performing the method of any of the possible aspects of the second aspect or the second aspect described above.

In a fifth aspect, an embodiment of the present application provides a terminal, including a receiver and a processor coupled to the receiver. Wherein the processor is configured to perform the method of any of the above aspects or the first aspect of the first aspect.

In a sixth aspect, an embodiment of the present application provides a base station, including a radio frequency device and a baseband processor. Wherein the baseband processor is configured to perform the method of any of the above aspects or the second aspect of the second aspect.

In a seventh aspect, the embodiment of the present application provides a communication system, including: at least two terminals according to the sixth aspect, and the base station according to the seventh aspect.

DRAWINGS

1 is a schematic diagram of distribution of neighboring cells in an embodiment of the present application;

2 is a schematic diagram of distribution of neighboring cells in a scenario of a multi-standard high-low frequency hybrid networking in the embodiment of the present application;

3 is a flowchart of an overview of cell search in an embodiment of the present application;

4 is a second flowchart of an overview of cell search in the embodiment of the present application;

FIG. 5 is a schematic structural diagram of a cell search apparatus according to an embodiment of the present application;

FIG. 6 is a second schematic structural diagram of a cell search apparatus according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a terminal in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present application.

detailed description

Embodiments of the present application will be described below with reference to the accompanying drawings.

The embodiment of the present application can be applied to a cell search in a plurality of networking scenarios, for example, an application scenario of a hybrid network of different coverage radius.

In particular, in a scenario of a multi-standard high-low frequency hybrid networking, as shown in FIG. 2, a cell in a Long Term Evolution (LTE) system (LTE CELL A) is a low frequency cell, and its coverage is large, for example, Each LTE CELL covers a radius of several kilometers. In the coverage of LTE CELL A, 16 neighbor cells (NR CELL) are included, which are respectively identified as NR CELL 1-16. NR CELL1～16 are cells in the new wireless (5G New Radio, 5G NR) system, which are high-frequency cells, and the coverage of each NR CELL is small. For example, the coverage radius of each NR CELL is about several tens of meters. A few hundred meters. The range defined by the outermost solid line in Figure 2 is the coverage of LTE CELL A, and the coverage of each NR CELL is small. Further, when the actual positional relationship between the neighboring cells is not considered, since there are multiple NR CELLs in the coverage of one LTE CELL, as shown in FIG. 2, 16 NR CELLs are included in the coverage of the LTE CELL A, Therefore, when performing cell search, a terminal located in the coverage of LTE CELL A needs to search for 8 NR CELLs to determine candidate cells for cell handover or cell reselection, so the average search time required for cell search is longer.

Wherein, cell handover refers to the coverage of a terminal from a cell (referring to a base station or a base station) in a wireless communication system. Range) Channel switching required to maintain the terminal without interrupting communication when moving to another cell. The cell reselection means that the terminal accesses from one cell to another in an idle state, and the other cell is the current serving cell, wherein the current serving cell is a cell with better quality than the original serving cell.

The embodiment of the present application provides a cell search method for solving the problem that the average time required for cell search in the prior art is long. Referring to Figure 3, the method includes:

Step 300: The base station acquires M group parameter measurement results corresponding to the M cells one by one according to the cell information of the M cells included in the coverage area.

The j-th group parameter measurement result is a received strength value of the reference signal transmitted by the base station measured in the j-th cell or a distance between the j-th cell and the base station, and j is an arbitrary integer of 1 to M. , M ≥ 2 and is a positive integer.

It should be understood that, for step 300, each packet parameter measurement result may be included in the basic information of the cell, obtained in the cell configuration process, saved in the base station, or obtained by the base station through the third party device storing the information. For example, in the cell configuration process, the operator uses the measurement device to measure the reception strength of the reference signal transmitted by the base station in each cell, and simultaneously record the location information of the cell.

Step 310: The base station divides M cells into N neighbor cell groups according to the M group parameter measurement results, and generates N neighbor cell lists and group indication information.

Each of the neighboring cell lists includes a cell identifier of at least one neighboring cell, and the packet indication information indicates a range of values of a distance between at least one neighboring cell and the base station in each neighboring cell list, or indicates each The range of the received strength of the reference signal sent by the base station to the at least one neighboring cell in the neighboring cell list is N ≥ 2 and is a positive integer.

Step 320: The base station sends N neighbor cell lists and group indication information to terminals in its own coverage.

In a possible design, when the group indication information indicates a range of values of a distance between at least one neighboring cell and the base station in each neighboring cell list, the grouping indication information includes: one by one with the N neighboring cell lists. The corresponding N value ranges, or N threshold upper limits corresponding to the N neighbor cell lists.

At this time, the packet indication information further instructs the terminal to determine the distance between the terminal and the base station, and obtains a packet parameter value.

In a possible design, when the group indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the group indication information includes: The N value ranges corresponding to the list one by one, or the N threshold lower limits corresponding to the N neighbor cell lists one by one.

At this time, the group indication information further instructs the terminal to measure the reception strength of the reference signal transmitted by the base station, and obtain a group parameter value.

For the above two possible designs, it should be understood that the terminal acquiring the packet parameter value needs to correspond to the value range indicated in the packet indication information sent by the base station. That is, when the packet indication information indicates the value range of the distance between the at least one neighboring cell and the base station in each neighboring cell list, the packet parameter value obtained by the terminal is the distance between the terminal and the base station; And indicating, when the at least one neighboring cell in each neighboring cell list has a value range of the received strength of the reference signal sent by the base station, the grouping parameter value obtained by the terminal is a received strength value obtained by the terminal measuring the reference signal sent by the base station;

Alternatively, the terminal and the base station agree in advance on the measurement rule, for example, measuring the distance between the terminal and the base station or measuring the received strength of the reference signal sent by the base station. At this time, the terminal may obtain the group parameter value according to the agreed measurement rule, and the base station A neighbor cell list and packet indication information for the measurement rule are sent.

Generally, the closer the distance between the cell and the base station, the greater the reception strength, and the farther the distance between the cell and the base station is, the smaller the reception strength is. The receiving strength of the reference signal transmitted by the base station herein may be a received signal strength indicator (Received) Signal Strength Indication, RSSI).

Referring to Table 2 and Table 3, Table 2 and Table 3 are examples of forms in which the base station sends the neighbor cell list and the packet indication information to the terminals in the coverage area, where Table 2 is the base station according to the RSSI corresponding to each cell. For example of dividing a cell group, the packet type shown in Table 2 is RSSI, and the RSSI threshold lower limit corresponding to each packet is given. Table 3 is an example of a cell group dividing a cell group according to a distance between each cell and a base station. The packet type shown in Table 3 is a distance, and the upper limit of the distance threshold corresponding to each packet is given. It should be understood that the various information listed in Tables 2 and 3 is merely exemplary and is not intended to limit the application. In addition, although Table 2 and Table 3 respectively list a variety of information, those skilled in the art can understand that the neighbor cell information corresponding to Table 2 and Table 3 does not have to include all the information. Alternatively, Table 2 and Table 3 may also include information represented by other fields not listed herein, which is not specifically limited in this embodiment of the present application. In addition, the grouping indication information may also be given in other ways, not necessarily in the form of an upper threshold or a lower threshold.

Table 2

table 3

UU MSGUU MSG
…...
Neighbor cell listNeighbor cell list
	Neighbor cell gouping typeNeighbor cell gouping type	DistanceDistance
	Neighbor cell gouping list Threshold1Neighbor cell gouping list Threshold1	Threshold1Threshold1
	Neighbor cell list1Neighbor cell list1	cell id 1，cell id 2，…Cell id 1,cell id 2,...
	Neighbor cell gouping list Threshold2Neighbor cell gouping list Threshold2	Threshold2Threshold2
	Neighbor cell list2Neighbor cell list2	cell id m，cell id n，…Cell id m,cell id n,...
	…...	…...
…...

In Table 2, the value range corresponding to the first list is determined by Threshold1, which is [Threshold1, +∞), and the second column The value range of the table is determined by Threshold1 and Threshold2, which is [Threshold2, Threshold1), ..., and the range of values corresponding to the i-th list is determined by Threshold i-1 and Threshold i, which is [Threshold i, Threshold I-1).

In Table 3, the value range corresponding to the first list is determined by Threshold1, which is (0, Threshold1), and the value range corresponding to the second list is determined by Threshold1 and Threshold2, which is (Threshold1, Threshold2), ... The value range corresponding to the i-th list is determined by Threshold i-1 and Threshold i, and is (Threshold i, Threshold i-1).

When performing step 320, the base station may divide the M cells into N neighbor cell groups according to different division conditions, and the division condition may be determined according to actual conditions.

As shown in FIG. 2, 16 NR CELLs are included in the coverage of LTE CELL A. Assuming that the coverage radius of LTE CELL A is 4 km, a cell with a condition that the distance from LTE CELL A is less than or equal to 2 km is a cell group, and LTE CELL A is a cell group with a distance greater than 2 km and less than or equal to 4 km. Therefore, the distance between NR CELL 1 and 7 and LTE CELL A is less than 2 km, and NR CELL 1 to 7 are regarded as a cell group, as shown by the dotted line in FIG. 2 . The formed area indicates that the distance from LTE CELL A is less than or equal to 2 km, and the cell included in the area is regarded as a cell group. The distance between NR CELL8~16 and LTE CELL A is greater than 2km and less than or equal to 4km, and NR CELL8~16 is taken as a cell group. The area enclosed by the dotted line and the outermost solid line in Fig. 2 indicates that the distance from LTE CELL A is greater than 2km is less than or equal to 4km, and the cell included in the area is used as a cell group. The base station generates two neighbor cell lists and packet indication information, where the first neighbor cell list includes the cell IDs of the NR CELLs 1 to 7, and the upper threshold of the first neighbor cell list corresponds to 2 km, indicating that the NR CELLs 1 to 7 and the base station The distance between the two ranges is greater than 0 and less than or equal to 2 km. The second neighbor cell list includes the cell ID of NR CELL 8 to 16. The upper threshold of the second neighbor cell list is 4 km, indicating NR CELL 1 to 7 and The distance between the base stations ranges from 2 km to less than or equal to 4 km. The values mentioned in the above-mentioned division conditions can be set and adjusted according to actual needs. The above numerical values are merely illustrative and are not intended to limit the embodiments of the present application.

Therefore, compared with the prior art, the number of cells included in the neighbor cell list is large, and the average time required to complete the cell search is long. According to the method provided in this embodiment, the base station performs one by one according to the M cells. The corresponding M group parameter measurement results divide the M cells into N neighbor cell groups, and generate N neighbor cell lists and group indication information. At this time, the terminal may first determine the target neighboring cell list to be searched, and search for each neighboring cell in the target neighboring cell list to be searched. Since the cells are grouped at this time, the number of cells included in each neighboring cell list is small. , can effectively reduce the average time required to complete the cell search.

Specifically, as shown in FIG. 4, the embodiment of the present application provides a cell search method, where the method includes:

Step 400: The terminal receives the N neighbor cell list and the packet indication information sent by the base station.

Step 410: The terminal acquires a group parameter value, where the group parameter value is a received intensity value obtained by the terminal measuring the reference signal sent by the base station, or is a distance between the terminal and the base station.

Step 420: The terminal determines a target neighbor cell list in the N neighbor cell lists according to the group parameter value and the packet indication information.

Step 430: The terminal performs cell search on the neighboring cells corresponding to the cell identifiers of the at least one neighboring cell included in the target neighboring cell list.

In a possible design, when the packet parameter value is the distance between the terminal and the base station, the terminal acquires the group parameter. Value, at this time the terminal can determine the distance between the terminal and the base station through GPS.

For example, the location information of the terminal itself may be obtained by a positioning technology of a Global Positioning System (GPS), and the location information of the base station may be notified to the terminal by the base station. The terminal may send the location information of the base station to the positioning system, and then the positioning system calculates the distance between the terminal and the base station, and notifies the terminal.

In a possible design, the terminal determines the target neighbor cell list to be searched in the N neighbor cell list, which may be, but is not limited to, the following method:

The terminal compares the packet parameter value with the value range corresponding to each of the N neighbor cell lists, and determines a neighbor cell list corresponding to a value range in which the packet parameter value falls into the target neighbor cell list.

For example, according to Table 2, the larger the RSSI is, the closer the distance between the cell and the base station is. Assume that only two Neighbor cell lists are included in Table 2, which are respectively Neighbor cell list1 and Neighbor cell list2, which are directly given in Table 2. The two neighboring cell lists respectively correspond to threshold lower values, wherein according to Neighbor cell grouping list Threshold1, Neighbor cell list1 corresponds to a value range greater than or equal to Threshold1, according to Neighbor cell grouping list Threshold1 and Neighbor cell grouping list Threshold2, Neighbor The value range corresponding to cell list2 is less than Threshold1 and greater than or equal to Threshold2.

When the UE needs to perform a cell search, the UE measures the RSSI by using the RSSI-UE. If the RSSI-UE ≥ Threshold1, it determines that the target to-be-searched neighbor cell is Neighbor cell list1, and if Threshold1>RSSI-UE≥Threshold2, the target is determined. The search neighboring cell is Neighbor cell list2.

In addition, after the terminal determines the target to-be-searched neighbor cell list in the N neighbor cell lists, the terminal may further determine a search corresponding to the N-1 neighbor cell lists in the N neighbor cell lists except the target to-be-searched neighbor cell list. priority.

Or, when the terminal determines that the neighboring cell indicated by the target to-be-searched neighbor cell list fails to search, and further determines a search priority corresponding to the N-1 neighboring cell lists in the N neighboring cell lists except the target to-be-searched neighboring cell list. level.

Alternatively, when determining, by the terminal, the neighbor cell to be searched, the terminal further determines a search priority corresponding to the N-1 neighbor cell lists except the target neighbor cell list to be searched.

It should be understood that the terminal may have an error when acquiring the packet parameter value, which causes the determined target to be searched for the neighbor cell list to be incorrect, further causing the terminal to perform the cell search failure according to the target to-be-searched neighbor cell list, and does not search for the cell handover or the cell weight. Selected candidate cell. At this time, the terminal needs to continue to perform cell search, and searches for at least one neighboring cell in the N-1 neighbor cell list except the target to-be-searched neighbor cell list, and the terminal may randomly select an unsearched neighbor cell list, or determine The search priorities corresponding to the N-1 neighbor cell lists are respectively searched, and at least one neighbor cell in the N-1 neighbor cell list is sequentially searched according to the order of the search priorities.

In a possible design, the terminal determines the search priority corresponding to the N-1 neighbor cell lists in the N neighbor cell list except the target to-be-searched neighbor cell list, and may be, but is not limited to, the following methods:

When the group indication information indicates the range of the distance between the at least one neighboring cell and the base station in each neighboring cell list, the terminal separately calculates the difference between the upper threshold of the N neighboring cell lists and the packet parameter value. Absolute value; the terminal determines, according to the absolute value of the difference between the obtained upper limit of the N-1 threshold and the packet parameter value, the search priority corresponding to the N-1 neighbor cell lists;

Or, when the group indication information indicates a range of values of the received strength of the reference signal sent by the base station in the neighboring cell list, the terminal separately calculates a threshold lower limit and a grouping parameter corresponding to each of the N neighboring cell lists. The absolute value of the difference value; the terminal determines the search priority corresponding to the N-1 neighbor cell lists according to the absolute value of the difference between the obtained N-1 threshold lower limit and the group parameter value.

The lower the absolute value corresponding to the neighbor cell list, the higher the search priority in the N-1 neighbor cell list.

For example, according to Table 3, the greater the distance indicates the farther the distance between the cell and the base station, it is assumed that only three Neighbor cell lists are included in Table 3, namely Neighbor cell list1, Neighbor cell list2, and Neighbor cell list3, where The threshold values corresponding to the two neighbor cell lists are directly given in 3, which are Threshold1, Threshold2, and Threshold3, respectively.

When the UE needs to perform cell search, calculate the distance between the UE and the base station, and use distance-UE to indicate that if 0<distance-UE≤Threshold1, it is determined that the target to-be-searched neighbor cell is Neighbor cell list1, and if Threshold1<distance-UE ≤Threshold2, it is determined that the target to-be-searched neighboring cell is Neighbor cell list2, and if Threshold2<distance-UE≤Threshold3, it is determined that the target to-be-searched neighboring cell is Neighbor cell list3.

Assume that the target to-be-searched neighbor cell is Neighbor cell list3, and then calculate the absolute value of the difference between the distance-UE and Threshold1 and Threshold2, which are respectively recorded as A1 and A2, and when A1≥A2, the search of the remaining two neighbor cell lists The priority is ranked as Neighbor cell list2, Neighbor cell list1. When A2>A1, the search priorities of the remaining two neighbor cell lists are ranked as Neighbor cell list1, Neighbor cell list2.

Based on the same concept, the present application further provides a cell search device, which may be used to perform the method embodiment corresponding to FIG. 3 above. Therefore, the implementation manner of the cell search device provided in this embodiment of the present application may refer to the implementation manner of the method. , the repetition will not be repeated.

As shown in FIG. 5, the present application provides a cell search apparatus for performing the method corresponding to the embodiment of FIG. 4. The apparatus 500 includes: a receiving unit 510, and a processing unit 520:

The processing unit 520 is configured to:

Receiving N neighbor cell lists and packet indication information sent by the base station by the receiving unit 510, where each neighbor cell list respectively includes a cell identifier of at least one neighboring cell, where the packet indication information indicates in each neighbor cell list The value range of the distance between the at least one neighboring cell and the base station, or the range of the received strength of the reference signal sent by the at least one neighboring cell in each neighboring cell list to the base station, N≥ 2 and is a positive integer;

Obtaining a grouping parameter value, where the grouping parameter value is a receiving intensity value obtained by the terminal measuring the reference signal sent by the base station, or a distance between the terminal and the base station;

Determining, in the N neighbor cell lists, a target neighbor cell list according to the packet parameter value and the packet indication information;

And performing cell search on the neighboring cells corresponding to the cell identifiers of the at least one neighboring cell included in the target neighboring cell list.

In a possible design, when the grouping indication information indicates a value range of a distance between at least one neighboring cell in each neighboring cell list and the base station, the grouping indication information includes: The N value ranges corresponding to the N neighbor cell lists are one-to-one, or the N threshold upper limits corresponding to the N neighbor cell lists.

In a possible design, when the grouping indication information indicates a value range of a receiving strength of a reference signal sent by the base station in the neighboring cell list, the grouping indication information includes: : N value ranges corresponding to the N neighbor cell lists, or N threshold lower limits corresponding to the N neighbor cell lists.

In a possible design, when the grouping indication information indicates a value range of a distance between at least one neighboring cell in each neighboring cell list and the base station, the packet indication information further indicates the The terminal measures the receiving strength of the reference signal sent by the base station, and obtains the grouping parameter value;

Or when the packet indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the packet indication information further instructing the terminal to determine the Terminal The packet parameter value is obtained from the distance between the base stations.

In a possible design, the processing unit 520 is configured to:

When the packet parameter value is a distance between the terminal and the base station, a distance between the terminal and the base station is determined by a GSP.

In a possible design, the processing unit 520 is configured to:

When determining the target to-be-searched neighbor cell list in the N neighbor cell list, comparing the packet parameter value with a value range corresponding to each of the N neighbor cell lists, and falling into the group parameter value A neighbor cell list corresponding to a value range is determined as the target neighbor cell list.

In a possible design, the processing unit 520 is configured to:

After determining the target to-be-searched neighbor cell list in the N neighbor cell list, determining, in the N neighbor cell lists, a search corresponding to the N-1 neighbor cell lists except the target to-be-searched neighbor cell list priority.

In a possible design, the processing unit 520 is configured to:

Determining a search priority corresponding to each of the N neighbor cell lists except the target to-be-searched neighbor cell list in the N neighbor cell list, when the packet indication information indicates each neighbor cell list Calculating the absolute value of the difference between the upper threshold of the N neighbor cells and the packet parameter value, respectively, when the distance between the neighboring cell and the base station is in a range of values; Determining, from small to large, the absolute value of the difference between the upper threshold of the threshold and the value of the packet parameter, the search priority corresponding to the N-1 neighbor cell lists respectively; or, when the packet indication information indicates each neighbor And determining, by the at least one neighboring cell in the cell list, the absolute value of the difference between the threshold lower limit of the N neighbor cell lists and the packet parameter value, respectively, when the value range of the received strength of the reference signal sent by the base station is a value; determining, according to the obtained absolute value of the difference between the lower limit of the N-1 threshold and the packet parameter value, the search priority corresponding to the N-1 neighbor cell lists.

Referring to FIG. 6, the present application provides a cell search apparatus, which is used to execute the method corresponding to the embodiment in FIG. 3. The apparatus 600 includes: a sending unit 610, and a processing unit 620:

The processing unit 620 is configured to:

Obtaining M group parameter measurement results corresponding to the M cells one by one according to the cell information of the M cells included in the coverage, wherein the jth group parameter measurement result is in the jth cell The measured reception strength value of the reference signal sent by the base station or the distance between the j-th cell and the base station, j is an arbitrary integer of 1 to M, and M≥2 is a positive integer;

Decoding the M cells into N neighboring cell groups, and generating N neighbor cell lists and packet indication information, where each neighbor cell list includes a cell identifier of at least one neighboring cell, The grouping indication information indicates a value range of a distance between at least one neighboring cell in each neighboring cell list and the base station, or indicates that at least one neighboring cell in each neighboring cell list is for the base station The range of the received strength of the transmitted reference signal, N≥2 and a positive integer;

The N neighbor cell list and the packet indication information are sent by the sending unit 610 to the terminal within the coverage area.

In a possible design, when the grouping indication information indicates a value range of a distance between at least one neighboring cell in each neighboring cell list and the base station, the grouping indication information includes: N neighboring cell list One-to-one corresponding N value ranges, or N upper thresholds corresponding to the N neighbor cell lists.

Or when the packet indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the packet indication information further instructing the terminal to determine the The distance between the terminal and the base station obtains the packet parameter value.

It should be understood that the specific division of the above modules is by way of example only and is not to be construed as limiting.

Based on the same concept, the present application further provides a terminal, which can be used to perform the method embodiment corresponding to the foregoing FIG. 4, and therefore, the implementation manner of the terminal provided by the embodiment of the present application can be referred to the implementation manner of the method, where it is repeated. No longer.

Referring to FIG. 7, the present application provides a terminal 700, including: a receiver 710 and a processor 720 coupled to the receiver 710;

The processor 720 is configured to:

Receiving, by the receiver, N neighbor cell lists and packet indication information sent by the base station, where each neighbor cell list respectively includes a cell identifier of at least one neighboring cell, where the packet indication information indicates each neighbor cell list The value range of the distance between the at least one neighboring cell and the base station, or the range of the receiving strength of the reference signal sent by the at least one neighboring cell in each neighboring cell list to the base station, N ≥ 2 and is a positive integer;

It should be noted that the receiver 710 in this embodiment may be a radio frequency receiver. It should be understood that the radio frequency receiver may be composed of an antenna, a radio front-end circuit, and a radio frequency chip. Wherein, when the packet parameter value is the received intensity value of the reference signal sent by the base station, the processor 720 receives the reference signal through the radio frequency receiver and performs measurement to obtain the received intensity value of the reference signal. Further, when the packet parameter value is a distance between the terminal and the base station, the receiver 710 may further include a connectivity receiver supporting a Global Navigation Satellite System (GNSS), Those skilled in the art should know that the connectivity receiver can also support communication technologies such as WIFI, Bluetooth (BT), and incoming communication (NFC), and the processor 720 can acquire the terminal and the location based on the global satellite navigation system through the connectivity receiver. The distance between the base stations. Among them, GNSS can include: Global Positioning System (GPS), Glonass, Beidou, Quasi-Zenith Satellite System (QZSS) and Satellite-based Augmentation System (SBAS).

In a possible design, the processor 720 is configured to determine, by using a GSP, a distance between the terminal and the base station when the packet parameter value is a distance between the terminal and the base station. .

In one possible design, the processor 720 is configured to:

In a possible design, the processor 720 is further configured to:

In one possible design, the processor 720 is configured to:

It should be noted that, in a specific implementation manner, the function of the receiving unit 510 in FIG. 5 can be implemented by the receiver 710 in FIG. 7, and the function of the processing unit in FIG. 5 can be implemented by the processor 720 in FIG. .

Referring to FIG. 8, the present application provides a base station 800, including: a radio frequency device 810 and a baseband processor 820;

The baseband processor 820 is configured to:

Obtaining M group parameter measurement results corresponding to the M cells one by one according to the cell information of the M cells included in the coverage, wherein the jth group parameter measurement result is in the jth cell Measured a received strength value of the reference signal sent by the base station or a distance between the jth cell and the base station, where j is taken Any integer from 1 to M, M≥2 and being a positive integer;

Decoding, according to the M group parameter measurement results, the M cells into N neighbor cell groups, generating N neighbor cell lists and packet indication information, where the packet indication information indicates at least each neighbor cell list The range of the distance between the neighboring cell and the base station, or the range of the received strength of the reference signal sent by the at least one neighboring cell in each neighboring cell list to the base station, N≥2 And is a positive integer;

And sending, by the radio frequency device, the N neighbor cell list and the packet indication information to a terminal in a coverage area.

It should be noted that, in a specific implementation manner, the function of the sending unit 610 in FIG. 6 can be implemented by the radio frequency device 810 in FIG. 8. The function of the processing unit 620 in FIG. 6 can be implemented by the baseband processor in FIG. 820 implementation.

The embodiment of the present application further provides a communication system, including: at least two terminals and a base station, where the terminal may be the terminal provided by the embodiment corresponding to FIG. 7, and the base station may be the base station provided by the embodiment corresponding to FIG. .

In summary, compared with the prior art, the number of cells included in the neighbor cell list is large, and the average time required to complete the cell search is long. According to the method provided in this embodiment, the base station according to the M The M group parameter measurement results corresponding to the cell one by one divide the M cells into N neighbor cell groups, and generate N neighbor cell lists and group indication information. At this time, the terminal may first determine the target neighboring cell list to be searched, and search for each neighboring cell in the target neighboring cell list to be searched. Since the cells are grouped at this time, the number of cells included in each neighboring cell list is small. , can effectively reduce the average time required to complete the cell search.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Therefore, the embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, embodiments of the present application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that instructions are executed by a processor of a computer or other programmable data processing device Means are provided for implementing the functions specified in one or more of the flow or in one or more blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the embodiments of the present invention.

Claims

A method for cell search, comprising:

The terminal receives the N neighbor cell list and the packet indication information sent by the base station, where each neighbor cell list includes a cell identifier of at least one neighboring cell, where the packet indication information indicates at least one neighbor in each neighbor cell list. The value range of the distance between the cell and the base station, or the value range of the received strength of the reference signal sent by the at least one neighboring cell in each neighboring cell list to the base station, N≥2 and Positive integer

The terminal acquires a packet parameter value, where the packet parameter value is a received strength value obtained by the terminal to measure a reference signal sent by the base station, or a distance between the terminal and the base station;

Determining, by the terminal, a target neighbor cell list in the N neighbor cell lists according to the packet parameter value and the packet indication information;

The terminal performs cell search on the neighboring cells corresponding to the cell identifiers of the at least one neighboring cell included in the target neighboring cell list.
The method according to claim 1, wherein when the packet indication information indicates a value range of a distance between at least one neighboring cell in each neighbor cell list and the base station, the packet indication The information includes: N value ranges corresponding to the N neighbor cell lists, or N threshold upper limits corresponding to the N neighbor cell lists.
The method according to claim 1, wherein when the packet indication information indicates a range of values of received strength of a reference signal transmitted by the base station in each neighboring cell list, The packet indication information includes: N value ranges corresponding to the N neighbor cell lists, or N threshold lower limits corresponding to the N neighbor cell lists.
The method according to any one of claims 1 to 3, wherein when the packet indication information indicates a range of values of a distance between at least one neighboring cell in each neighboring cell list and the base station The grouping indication information further indicates that the terminal measures the receiving strength of the reference signal sent by the base station, and obtains the grouping parameter value;

Or when the packet indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the packet indication information further instructing the terminal to determine the The distance between the terminal and the base station obtains the packet parameter value.
The method according to any one of claims 1 to 3, wherein when the packet parameter value is a distance between the terminal and the base station, the terminal acquires a group parameter value, including:

The terminal determines a distance between the terminal and the base station through a global positioning system GSP.
The method according to any one of claims 1-5, wherein the terminal determines, in the list of N neighbor cells, a list of target neighbor cells to be searched, including:

The terminal compares the packet parameter value with a value range corresponding to each of the N neighbor cell lists, and determines, as a neighbor cell list corresponding to a value range in which the packet parameter value falls. A list of target neighbor cells.
The method according to any one of claims 1-6, wherein, after determining, by the terminal, the target to-be-searched neighbor cell list in the N neighbor cell list, the method further includes:

Determining, by the terminal, a search priority corresponding to each of the N-1 neighbor cell lists except the target to-be-searched neighbor cell list in the N neighbor cell lists.
The method according to claim 7, wherein the terminal determines a search priority corresponding to each of the N neighbor cell lists except the target to-be-searched neighbor cell list in the N neighbor cell lists. , including:

When the group indication information indicates a value range of a distance between the at least one neighboring cell and the base station in each of the neighboring cell lists, the terminal respectively calculates a threshold upper limit corresponding to each of the N neighboring cell lists. An absolute value of the difference from the packet parameter value; the terminal determines the N-1 neighbor cell list according to the absolute value of the difference between the obtained N-1 threshold upper limit and the packet parameter value Corresponding search priorities;

Or, when the group indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the terminal separately calculates the N neighbor cell list Determining an absolute value of a difference between a corresponding lower threshold value and the grouping parameter value; the terminal determining the N- according to an absolute value of a difference between the obtained N-1 threshold lower limit and the grouping parameter value The search priority corresponding to each of the neighbor cell lists.
A method for cell search, comprising:

Obtaining, by the base station, the M group parameter measurement results corresponding to the M cells one by one according to the cell information of the M cells included in the coverage, where the jth packet parameter measurement result is in the jth cell The received strength value of the reference signal transmitted by the base station or the distance between the j-th cell and the base station, j is an arbitrary integer of 1 to M, M≥2 and is a positive integer;

The base station divides the M cells into N neighbor cell groups according to the M group parameter measurement results, and generates N neighbor cell lists and group indication information, where each neighbor cell list includes at least one neighbor cell a cell identifier, the packet indication information indicating a range of values of a distance between at least one neighboring cell in the neighboring cell list and the base station, or indicating at least one neighboring cell in each neighboring cell list The range of the received strength of the reference signal sent by the base station is N≥2 and is a positive integer;

The base station sends the N neighbor cell list and the packet indication information to a terminal within its own coverage.
The method according to claim 9, wherein when the packet indication information indicates a value range of a distance between at least one neighboring cell in each neighbor cell list and the base station, the packet indication The information includes: N value ranges corresponding to the N neighbor cell lists, or N threshold upper limits corresponding to the N neighbor cell lists.
The method according to claim 9, wherein when the packet indication information indicates a range of values of received strength of a reference signal transmitted by the base station in each neighboring cell list, The packet indication information includes: N value ranges corresponding to the N neighbor cell lists, or N threshold lower limits corresponding to the N neighbor cell lists.
The method according to any one of claims 9 to 11, wherein when the packet indication information indicates a range of values of a distance between at least one neighboring cell in each neighboring cell list and the base station The grouping indication information further indicates that the terminal measures the receiving strength of the reference signal sent by the base station, and obtains the grouping parameter value;

Or when the packet indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the packet indication information further instructing the terminal to determine the The distance between the terminal and the base station obtains the packet parameter value.
A terminal, comprising: a receiver and a processor coupled to the receiver;

The processor is used to:

Receiving, by the receiver, N neighbor cell lists and packet indication information sent by the base station, where each neighbor cell list respectively includes a cell identifier of at least one neighboring cell, where the packet indication information indicates each neighbor cell list The value range of the distance between the at least one neighboring cell and the base station, or the range of the receiving strength of the reference signal sent by the at least one neighboring cell in each neighboring cell list to the base station, N ≥ 2 and is a positive integer;

Obtaining a grouping parameter value, where the grouping parameter value is a receiving intensity value obtained by the terminal measuring the reference signal sent by the base station, or a distance between the terminal and the base station;

Determining, in the N neighbor cell lists, a target neighbor cell list according to the packet parameter value and the packet indication information;

And performing cell search on the neighboring cells corresponding to the cell identifiers of the at least one neighboring cell included in the target neighboring cell list.
The terminal according to claim 13, wherein when the packet indication information indicates a value range of a distance between at least one neighboring cell in each neighbor cell list and the base station, the packet indication The information includes: N value ranges corresponding to the N neighbor cell lists, or N threshold upper limits corresponding to the N neighbor cell lists.
The terminal according to claim 13, wherein when the packet indication information indicates a range of values of received strength of a reference signal transmitted by the base station in each neighboring cell list, The packet indication information includes: N value ranges corresponding to the N neighbor cell lists, or N threshold lower limits corresponding to the N neighbor cell lists.
The terminal according to any one of claims 13 to 15, wherein when the packet indication information indicates a range of values of a distance between at least one neighboring cell in each neighboring cell list and the base station The grouping indication information further indicates that the terminal measures the receiving strength of the reference signal sent by the base station, and obtains the grouping parameter value;

Or when the packet indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the packet indication information further instructing the terminal to determine the The distance between the terminal and the base station obtains the packet parameter value.
The terminal according to any one of claims 13, 14, or 16, wherein the processor is configured to: when the packet parameter value is a distance between the terminal and the base station, determine by GSP The distance between the terminal and the base station.
The terminal according to any one of claims 13-17, wherein the processor is configured to:

When determining the target to-be-searched neighbor cell list in the N neighbor cell list, comparing the packet parameter value with a value range corresponding to each of the N neighbor cell lists, and falling into the group parameter value A neighbor cell list corresponding to a value range is determined as the target neighbor cell list.
The terminal according to any one of claims 13 to 18, wherein the processor is further configured to:

After determining the target to-be-searched neighbor cell list in the N neighbor cell list, determining, in the N neighbor cell lists, a search corresponding to the N-1 neighbor cell lists except the target to-be-searched neighbor cell list priority.
The terminal of claim 19, wherein the processor is configured to:

Determining a search priority corresponding to each of the N neighbor cell lists except the target to-be-searched neighbor cell list in the N neighbor cell list, when the packet indication information indicates each neighbor cell list Calculating the absolute value of the difference between the upper threshold of the N neighbor cells and the packet parameter value, respectively, when the distance between the neighboring cell and the base station is in a range of values; Determining, from small to large, the absolute value of the difference between the upper threshold of the threshold and the value of the packet parameter, the search priority corresponding to the N-1 neighbor cell lists respectively; or, when the packet indication information indicates each neighbor And determining, by the at least one neighboring cell in the cell list, the absolute value of the difference between the threshold lower limit of the N neighbor cell lists and the packet parameter value, respectively, when the value range of the received strength of the reference signal sent by the base station is Value; the absolute value of the difference between the obtained N-1 threshold lower limit and the grouping parameter value is small The large order determines the search priority corresponding to the N-1 neighbor cell lists respectively.
A base station, comprising: a radio frequency device and a baseband processor;

The baseband processor is used to:

Obtaining M group parameter measurement results corresponding to the M cells one by one according to the cell information of the M cells included in the coverage, wherein the jth group parameter measurement result is in the jth cell The measured reception strength value of the reference signal sent by the base station or the distance between the j-th cell and the base station, j is an arbitrary integer of 1 to M, and M≥2 is a positive integer;

Decoding the M cells into N neighboring cell groups, and generating N neighbor cell lists and packet indication information, where each neighbor cell list includes a cell identifier of at least one neighboring cell, The grouping indication information indicates a value range of a distance between at least one neighboring cell in each neighboring cell list and the base station, or indicates that at least one neighboring cell in each neighboring cell list is for the base station The range of the received strength of the transmitted reference signal, N≥2 and a positive integer;

And sending, by the radio frequency device, the N neighbor cell list and the packet indication information to a terminal in a coverage area.
The base station according to claim 21, wherein when the packet indication information indicates a value range of a distance between at least one neighboring cell in each neighbor cell list and the base station, the packet indication The information includes: N value ranges corresponding to the N neighbor cell lists, or N threshold upper limits corresponding to the N neighbor cell lists.
The base station according to claim 21, wherein when the packet indication information indicates a range of values of received strength of a reference signal transmitted by the base station in each neighboring cell list, The packet indication information includes: N value ranges corresponding to the N neighbor cell lists, or N threshold lower limits corresponding to the N neighbor cell lists.
The base station according to any one of claims 21 to 23, wherein when the packet indication information indicates a range of values of a distance between at least one neighboring cell and each of the neighboring cell lists The grouping indication information further indicates that the terminal measures the receiving strength of the reference signal sent by the base station, and obtains the grouping parameter value;

Or when the packet indication information indicates a value range of the received strength of the reference signal sent by the base station in the neighboring cell list, the packet indication information further instructing the terminal to determine the The distance between the terminal and the base station obtains the packet parameter value.
A communication system, comprising: at least two terminals according to claims 13-20, and a base station according to claims 21-24.