METHOD AND APPARATUS FOR REESTABLISHMENT OF CONNECTION BETWEEN TERMINAL DEVICE AND NETWORK

Abstract

A method and apparatus for a reestablishment of a connection between a terminal device and a network. The method performed at a terminal device comprises receiving, from a first network node in a communication network, information for assisting the terminal device to perform a reestablishment of a connection to the communication network; and transmitting, to the first network node, a message indicating that the terminal device selects a resource to perform the reestablishment. During the reestablishment of the connection, the interference for the wireless communication system may be reduced, and the latency for the terminal device may be reduced.

Description

Claims

1. A method performed at a terminal device, comprising: receiving, from a first network node in a communication network, information for assisting the terminal device to perform a reestablishment of a connection to the communication network, wherein the information comprises one or both of: a source cell reference signal received power (RSRP) threshold for initiating a reestablishment procedure; anda target cell RSRP threshold; andtransmitting, to the first network node, a message indicating that the terminal device selects a resource to perform the reestablishment.

2. The method according to claim 1, wherein the resource comprises a frequency, a cell, or both the frequency and the cell.

3. The method according to claim 1, wherein the information further comprise: at least one carrier frequency;at least one identifier of at least one cell;system information of the at least one cell; orany combination thereof.

4. The method according to claim 3, wherein the at least one carrier frequency comprises an intra-frequency carrier frequency or an inter-frequency carrier frequency.

5. (canceled)

6. The method according to claim 1, further comprising: performing a measurement based on the information, when a condition is met.

7. The method according to claim 6, wherein a measurement result includes a RSRP of the selected resource.

8. The method according to claim 6, wherein the terminal device obtains a RSRP from a measurement for a reference signal transmitted in a cell and wherein the terminal device selects the resource, based at least on a RSRP of respective resource.

9. (canceled)

10. The method according to claim 6, wherein the condition includes that at least N consecutive out-of-sync subframes are detected by the terminal device, where N is an integer, or wherein the condition includes that a timer for a radio link failure is running.

11-12. (canceled)

13. The method according to claim 1, further comprising one or more of: receiving, from the first network node, an acknowledge or a non-acknowledge about whether the terminal device is granted to use the selected resource for the reestablishment; andperforming the reestablishment of the connection to the communication network, wherein the terminal device performs the reestablishment when the RSRP of a cell serving the terminal device is less than or equal to a threshold.

14-15. (canceled)

16. The method according to claim 13, wherein the cell serving the terminal device is provided by the first network node.

17. The method according to claim 1, wherein the terminal device comprises a narrow band internet of things (NB-IoT) device;wherein the first network node comprises a base station; orwherein the terminal device comprises the NB-IoT and the first network node comprises the base station.

18. A method performed at a first network node, comprising: transmitting, to a terminal device, information for assisting the terminal device to perform a reestablishment of a connection to a communication network, wherein the information comprises one or both of: a source cell reference signal received power (RSRP) threshold for initiating a reestablishment procedure; anda target cell RSRP threshold; andreceiving, from the terminal device, a message indicating that the terminal device selects a resource to perform the reestablishment.

19. The method according to claim 18, wherein the resource comprises a frequency, a cell, or both the frequency and the cell.

20. The method according to claim 19, wherein the information further comprises: at least one carrier frequency;identifiers of at least one cell;system information of the at least one cell; orany combination thereof.

21. The method according to claim 20, wherein the at least one carrier frequency comprises an intra-frequency carrier frequency or an inter-frequency carrier frequency.

22. The method according to claim 20, further comprising: receiving, from a second network node, the source cell RSRP threshold.

23-24. (canceled)

25. The method according to claim 18, further comprising: transmitting, to a third network node, a message indicating that the terminal device selects a resource to perform the reestablishment.

26. The method according to claim 25, further comprising: receiving, from the third network node, an acknowledge or a non-acknowledge about whether the terminal device is granted to use the selected resource for the reestablishment.

27-29. (canceled)

30. A method performed at a second network node, comprising: transmitting to a first network node, a source cell reference signal received power (RSRP) threshold for initiating a reestablishment procedure of a terminal device, wherein the source cell RSRP threshold is determined, based on at least one RSRP measured by at least one terminal device having an RLF report.

31-38. (canceled)

39. A terminal device, comprising: a processor; anda memory, the memory containing instructions which, when executed by the processor, cause the terminal device to:receive, from a first network node in a communication network, information for assisting the terminal device to perform a reestablishment of a connection to the communication network, wherein the information comprises one or both of: a source cell reference signal received power (RSRP) threshold for initiating a reestablishment procedure; anda target cell RSRP threshold; andtransmit, to the first network node, a message indicating that the terminal device selects a resource to perform the reestablishment.

40-49. (canceled)