# US 2023/0056855 A1 · Cell reselection method, information transmission method, and communication device

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- Number: US 2023/0056855 A1
- Document ID: US20230056855A1
- Status: Published application
- Kind: A1
- Application number: 17/793,899
- Filed: 2020-01-20
- Published: 2023-02-23
- Earliest claimed: 2020-01-20
- Assignees: Beijing Xiaomi Mobile Software Co., Ltd.
- Applicants: Beijing Xiaomi Mobile Software Co., Ltd.
- Inventors: Xiaowei JIANG
- Web page: https://patentgrep.com/patent/US20230056855A1

## CPC

- H04W 36/06: Reselecting a communication resource in the serving access point
- H04W 48/18: Selecting a network or a communication service
- H04W 36/0072: {of resource information of target access point}
- H04W 36/13: {Cell handover without a predetermined boundary, e.g. virtual cells}
- H04W 36/302: {due to low signal strength}
- H04W 48/12: using downlink control channel
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided are a cell reselection method and apparatus, an information transmission method and apparatus, a communication device, and a storage medium. The cell reselection method is applied to a terminal, and comprises: receiving first priority information of a frequency point and a network slice combination supported by the frequency point; and performing cell reselection according to the first priority information.

## Claims

### Claim 1

A cell reselection method, performed by a terminal, comprising:
receiving first priority information of a combination of a frequency point and a network slice supported by the frequency point; and
performing a cell reselection based on the first priority information.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
determining the network slice supported by the frequency point based on slice information, wherein the slice information comprises at least one of single network slice selection auxiliary information, slice type information, and service type information.

### Claim 3 (depends on 1)

The method of claim 1, wherein, performing the cell reselection based on the first priority information comprises,
for a reselection of an intra-system inter-frequency cell and an intra-system intra-frequency cell, determining a signal quality of each of the intra-system inter-frequency cell and the intra-system intra-frequency cell with a same priority based on the first priority information; and
determining a target cell in the cell reselection as the cell, of the intra-system inter-frequency cell and the intra-system intra-frequency cell, having a higher signal quality.

### Claim 4 (depends on 1)

The method of claim 1, wherein, performing the cell reselection based on the first priority information comprises:
for a reselection of an intra-system inter-frequency cell, an intra-system intra-frequency cell, and an inter-system cell, determining based on the first priority information whether a cell with a priority higher than a priority of a serving cell of the terminal exists in the intra-system inter-frequency cell, the intra-system intra-frequency cell and the inter-system cell; and
determining a cell with a priority higher than the priority of the serving cell of the terminal and a signal quality higher than a first threshold as a target cell in the cell reselection in response to existence of a cell with a priority higher than the priority of the serving cell of the terminal.

### Claim 5 (depends on 1)

The method of claim 1, wherein, performing the cell reselection based on the first priority information comprises:
for a reselection of an intra-system inter-frequency cell, an intra-system intra-frequency cell and an inter-system cell, determining based on the first priority information whether a cell with a priority higher than or equal to a priority of a serving cell of the terminal exists in the intra-system inter-frequency cell, the intra-system intra-frequency cell and the inter-system cell; and
in response to inexistence of a cell with a priority higher than or equal to the priority of the serving cell of the terminal, when a signal quality of the serving cell is less than a second threshold and a cell with a signal quality higher than a third threshold exists in the intra-system inter-frequency cell, the intra-system intra-frequency cell and the inter-system cell, determining a cell with a signal quality higher than the third threshold as a target cell in the cell reselection.

### Claim 6 (depends on 1)

The method of claim 1, wherein, performing the cell reselection based on the first priority information comprises:
in response to a signal quality of the serving cell being higher than a fourth threshold, determining, based on the first priority information, whether a priority of a network slice supported by an intra-system intra-frequency cell is higher than a priority of a network slice supported by a serving cell of the terminal;
performing a signal quality measurement on the intra-system intra-frequency cell in response to the priority of the network slice supported by the intra-system intra-frequency cell being higher than the priority of the network slice supported by the serving cell; and
selecting the intra-system intra-frequency cell as a target cell in the cell reselection based on a result of the signal quality measurement.

### Claim 7 (depends on 1)

The method of claim 1, wherein, performing the cell reselection based on the first priority information comprises:
determining, based on the first priority information, whether a priority of an intra-system inter-frequency cell and a priority of an inter-system cell is higher than a priority of a serving cell of the terminal, in response to a signal quality of the serving cell being higher than a fifth threshold;
performing a signal quality measurement on the intra-system inter-frequency cell and the inter-system cell in response to the priority of the intra-system inter-frequency cell and the priority of the inter-system cell being higher than the priority of the serving cell; and
selecting a target cell in the cell reselection as the cell, of the intra-system inter-frequency cell and the inter-system cell, having a higher measured signal quality.

### Claim 8

(canceled)

### Claim 9 (depends on 1)

The method of claim 1, further comprising:
receiving system information broadcast by a serving cell of the terminal; and
determining a network slice supported by a frequency point of a neighbor cell based on slice information of the neighbor cell carried in the system information, wherein the first priority information at least indicates a priority of a combination of the frequency point of the neighbor cell and the network slice supported by the frequency point of the neighbor cell.

### Claim 10

(canceled)

### Claim 11 (depends on 9)

The method of claim 9, wherein, performing the cell reselection based on the first priority information comprises at least one of:
determining an intra-system inter-frequency cell corresponding to the slice information carried in the system information as a candidate cell in the cell reselection based on the first priority information;
and
determining an inter-system cell corresponding to the slice information carried in the system information as a candidate cell in the cell reselection based on the first priority information.

### Claim 12 (depends on 9)

The method of claim 9, further comprising:
receiving a first indication broadcast by the serving cell, wherein the first indication is configured to indicate whether the system information broadcast by the serving cell is capable of carrying the slice information;
wherein determining the network slice supported by the frequency point of the neighbor cell based on the slice information carried in the system information comprises:
determining that the frequency point of the neighbor cell and the frequency point of the serving cell support a same network slice in response to receiving the first indication and the system information carrying no slice information of the neighbor cell.

### Claim 13 (depends on 12)

The method of claim 12, further comprising:
receiving a second indication broadcast by the serving cell in response to the serving cell supporting broadcasting of the second indication, wherein the second indication is configured to indicate that the frequency point of the neighbor cell and the frequency point of the serving cell support different network slices;
wherein determining the network slice supported by the frequency point of the neighbor cell based on the slice information carried in the system information comprises:
determining the network slice supported by the frequency point of the neighbor cell based on the slice information of the neighbor cell carried in the system information in response to receiving the first indication and the second indication.

### Claim 14 (depends on 13)

The method of claim 13, further comprising:
determining that the frequency point of the neighbor cell and the frequency point of the serving cell support a same network slice in response to not receiving the second indication.

### Claim 15

(canceled)

### Claim 16 (depends on 1)

The method of claim 1, wherein, receiving the first priority information of a combination of a frequency point and a network slice supported by the frequency point comprises:
receiving the first priority information in response to a tracking area update (TAU) of the terminal or a radio access network area update (RAU).

### Claim 17 (depends on 1)

The method of claim 1, wherein, receiving the first priority information of a combination of a frequency point and a network slice supported by the frequency point comprises:
receiving radio source control (RRC) release information carrying the first priority information in response to the terminal releasing a RRC connection.

### Claim 18 (depends on 1)

The method of claim 1, further comprising:
reporting second priority information of a network slice supported by the terminal, wherein the second priority information is configured to determine one of (i) a priority of the frequency point and a priority of the network slice supported by the frequency point (ii) a priority of the combination of the frequency point and the network slice supported by the frequency point.

### Claim 19 (depends on 18)

The method of claim 18, further comprising:
determining the second priority information of the network slice or a network slice group supported by the terminal based on a service occurring frequency on the network slice.

### Claim 20 (depends on 18)

The method of claim 18, further comprising:
receiving priority request information;
wherein reporting the second priority information of the network slice supported by the terminal comprises:
reporting the second priority information of the network slice supported by the terminal based on the priority request information.

### Claim 21 (depends on 20)

The method of claim 20, further comprising:
reporting a third indication in response to an update of a priority of the network slice supported by the terminal or an expiration of a first timer;
wherein receiving the priority request information comprises:
receiving the priority request information issued based on the third indication.

### Claim 22 (depends on 18)

The method of claim 18, wherein, reporting the second priority information of the network slice supported by the terminal comprises:
reporting the second priority information of the network slice supported by the terminal in response to an update of a priority of the network slice supported by the terminal or an expiration of a second timer.

### Claim 23

(canceled)

### Claim 24 (depends on 18)

The method of claim 18, wherein, reporting the second priority information of the network slice supported by the terminal comprises:
switching the terminal to a connected state in response to the terminal being in an idle state or an inactive state and the priority of the network slice supported by the terminal being updated; and
reporting updated second priority information of the network slice supported by the terminal during the switching to the connected state.

### Claim 25

An information transmission method, performed by a base station, comprising:
issuing first priority information of a combination of a frequency point and a network slice supported by the frequency point, wherein the first priority information is used by a terminal for a cell reselection.

### Claim 26 (depends on 25)

The method of claim 25, further comprising:
broadcasting a first indication within a serving cell of the terminal, wherein the first indication is configured to indicate whether system information broadcasted by the serving cell is capable of carrying slice information of a neighbor cell, and the first priority information at least indicates a priority of a combination of a frequency point of the neighbor cell and a network slice supported by the frequency point of the neighbor cell.

### Claim 27 (depends on 26)

The method of claim 26, further comprising:
after broadcasting the first indication, in response to the serving cell and the neighbor cell supporting different network slices, broadcasting the system information carrying the slice information of the neighbor cell by the serving cell.

### Claim at position 28

-29. (canceled)

### Claim 30 (depends on 26)

The method of claim 26, further comprising:
in response to a frequency point of the serving cell and the frequency point of the neighbor cell supporting different network slices, broadcasting a second indication within the serving cell, wherein the system information is configured to carry the slice information of the neighbor cell after broadcasting of the first indication and the second indication.

### Claim at position 30

31-38. (canceled)

### Claim 39

A communication device, comprising:
an antenna;
a memory;
a processor, coupled to the antenna and the memory respectively, and configured to execute executable programs stored in the memory to control the antenna to receive and send wireless signals and perform the following:
receiving first priority information of a combination of a frequency point and a network slice supported by the frequency point; and
performing a cell reselection based on the first priority information.