Method and device for signal measurement

1. A method at a network device, comprising:

obtaining information about a first frequency region and a second frequency region, the first frequency region being used for transmitting a first synchronization signal from a serving cell managed by the network device, and the second frequency region being used for transmitting a second synchronization signal from a neighbor cell of the serving cell;

determining a configuration for a measurement gap based on the first frequency region and the second frequency region, the configuration indicating presence or absence of the measurement gap for a terminal device in the serving cell to measure the second synchronization signal; and

transmitting the configuration for the measurement gap to the terminal device independent of the presence or absence of the measurement gap.

2. The method according to claim 1 , wherein determining the configuration for a measurement gap comprises:

determining a relationship between the first frequency region and the second frequency region; and

determining whether the measurement gap needs to be configured based on at least one of the relationship and information of capability of the terminal device.

3. The method according to claim 2 , wherein determining whether the measurement gap needs to be configured comprises:

in response to the second frequency region being different from the first frequency region, determining that the measurement gap needs to be configured; and

in response to the second frequency region being identical to the first frequency region,

determining whether the first or second frequency region is in an operating frequency range of the terminal device, and

in response to determining that the first or second frequency region is in the operating frequency range of the terminal device, determining that the measurement gap does not need to be configured.

4. The method according to claim 2 , wherein determining whether the measurement gap needs to be configured comprises:

in response to the first or second frequency region being out of an operating frequency range of the terminal device, determining that the measurement gap needs to be configured; and

in response to the first and second frequency regions being in the operating frequency range of the terminal device, determining that the measurement gap does not need to be configured.

5. The method according to claim 2 , wherein determining whether the measurement gap needs to be configured comprises:

in response to the first or second frequency region being out of an operating frequency range of the terminal device, determining that the measurement gap needs to be configured; and

in response to the first and second frequency regions being in the operating frequency range of the terminal device,

determining whether the neighbor cell is synchronized with the serving cell,

in response to determining that the neighbor cell is synchronized with the serving cell, determining that the measurement gap does not need to be configured,

in response to determining that the neighbor cell being asynchronous with the serving cell, determining whether the first frequency region is different from the second frequency region, and

in response to the first frequency region is different from the second frequency region, determining that the measurement gap needs to be configured.

6. The method according to claim 2 , wherein determining whether the measurement gap needs to be configured comprises:

in response to the second frequency region being different from the first frequency region,

transmitting, to a neighbor network device managing the neighbor cell, a request for aligning the second frequency region to the first frequency region, and

in response to receiving, from the neighbor network device, a response indicating that the second frequency region is aligned to the first frequency region, determining that the measurement gap does not need to be configured.

7. The method according to claim 1 , further comprising: transmitting, to the terminal device, information about one or more of:

the first frequency region,

the second frequency region,

a carrier frequency of the serving cell,

a carrier frequency of the neighbor cell,

an offset between the first frequency region and the second frequency region,

an offset between the first frequency region and the carrier frequency of the serving cell,

an offset between the second frequency region and the carrier frequency of the neighbor cell, and

whether the neighbor cell is synchronized with the serving cell.

8. A method at a terminal device, comprising:

receiving a configuration for a measurement gap from a network device managing a serving cell, the configuration for the measurement gap being determined based on a first frequency region and a second frequency region and indicating presence or absence of the measurement gap for the terminal device to measure the second synchronization signal, the first frequency region being used for transmitting a first synchronization signal from the serving cell, and the second frequency region being used for transmitting a second synchronization signal from a neighbor cell of the serving cell; and

measuring the second synchronization signal based on the configuration for the measurement gap independent of the presence or absence of the measurement gap.

9. The method according to claim 8 , wherein measuring the second synchronization signal comprises:

in response to the configuration indicating that the measurement gap is configured, measuring the second synchronization signal on the second frequency region in the measurement gap; and

in response to the configuration indicating that the measurement gap is not configured, measuring the second synchronization signal on the second frequency region together with measuring first synchronization signal on the first frequency region.

10. The method according to claim 8 , further comprising: receiving, from the network device, information about one or more of:

the first frequency region,

the second frequency region,

a carrier frequency of the serving cell,

a carrier frequency of the neighbor cell,

an offset between the first frequency region and the second frequency region,

an offset between the first frequency region and the carrier frequency of the serving cell,

an offset between the second frequency region and the carrier frequency of the neighbor cell, and

whether the neighbor cell is synchronized with the serving cell.

11. The method according to claim 10 , wherein measuring the second synchronization signal comprises:

in response to the configuration indicating that the measurement gap is configured, determining whether the measurement gap is to be used when measuring the second synchronization signal based on the information about whether the neighbor cell is synchronized with the serving cell.

12. The method according to claim 8 , further comprising:

transmitting information of capability of the terminal device to the network device.

13. A method at a network device, comprising:

receiving, from a serving network device managing a serving cell, a request for aligning a second frequency region to a first frequency region, the first frequency region being used for transmitting a first synchronization signal from the serving cell, the second frequency region being used for transmitting a second synchronization signal from a neighbor cell of the serving cell, and the neighbor cell being managed by the network device;

generating a response indicating whether the second synchronization signal is aligned to the first synchronization signal such that the serving network device can determine a configuration for a measurement gap based on the first frequency region and the second frequency region, the configuration indicating presence or absence of the measurement gap for a terminal device in the serving cell to measure the second synchronization signal; and

transmitting the response to the serving network device.

14. A terminal device, comprising:

a processor and a memory, the memory containing program including instructions executable by the processor, the processor being configured to cause the terminal device to:

receive a configuration for a measurement gap from a network device managing a serving cell, the configuration for the measurement gap being determined based on a first frequency region and a second frequency region and indicating presence or absence of the measurement gap for the terminal device to measure the second synchronization signal, the first frequency region being used for transmitting a first synchronization signal from the serving cell, and the second frequency region being used for transmitting a second synchronization signal from a neighbor cell of the serving cell; and

measure the second synchronization signal based on the configuration for the measurement gap independent of the presence or absence of the measurement gap.