RADIO RESOURCE CONTROL CONNECTION RESUME METHOD OF WIRELESS COMMUNICATION SYSTEM

• US 20180220486A1
• Filed: 01/30/2018
• Published: 08/02/2018
• Est. Priority Date: 01/30/2017
• Status: Active Grant

• Current Assignee: 5G IP Holdings LLC (IPValuation Partners, LLC)
• Original Assignee: Chie-Ming Chou, Mei-Ju Shih, Yung-Lan Tseng
• Inventors: TSENG, YUNG-LAN, SHIH, MEI-JU, CHOU, CHIE-MING, WEI, CHIA-HUNG
• Granted Patent: US 10,624,150 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 36/0033 with transfer of context information
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/305 Handover due to radio link failure control signalling for hand-off failure H04W36/0079
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

An RRC connection resume method of a wireless communication system is provided. An RRC suspend message is received by a UE from a first base station. An RRC resume procedure is performed by the UE with a second base station in response to the RRC suspend message. An RRC resume response is received by the UE from the second base station.

Claims

1. A radio resource control (RRC) connection resume method of a wireless communication system, comprising:

receiving, by a user equipment (UE), an RRC suspend message from a first base station;

performing, by the UE, an RRC resume procedure with a second base station in response to the RRC suspend message; and

receiving, by the UE, an RRC resume response from the second base station.

2. The RRC connection resume method of claim 1, further comprising:

transmitting, by the second base station, a UE context fetch request to the first base station in response to the RRC resume procedure; and

receiving, by the second base station, a UE context fetch response from the first base station in response to the UE context fetch request;

wherein the first base station and the second base station is realized by different radio access numerologies, one of the first base station and the second base station is a wide-band numerology and another one is a narrow-band-Internet-of-Things numerology.

3. The RRC connection resume method of claim 1, further comprising:

transmitting, by the second base station, a UE context fetch request to the first base station in response to the RRC resume procedure; and

receiving, by the second base station, a UE context fetch response from the first base station in response to the UE context fetch request;

wherein the first base station and the second base station is realized by different radio access technologies, and one of the first base station and the second base station is a narrow-band-Internet-of-Things numerology.

4. The RRC connection resume method of claim 1, wherein the RRC suspend message comprises at least one of:

a) a target cell information;

b) a target radio access technology information;

c) an area information; and

d) an RRC resume validity timer.

5. The RRC connection resume method of claim 4, wherein the target radio access technology information comprises a bandwidth part configuration, and the bandwidth part configuration includes at least one of:

a) a bandwidth configuration in frequency domain;

b) a numerology information; and

c) a coverage enhancement level information.

6. The RRC connection resume method of claim 1, wherein the step of performing the RRC resume procedure with the second base station comprises:

transmitting, by the UE, an RRC resume request to the second base station;

wherein the RRC resume request comprises at least one of;

a) an RRC resume request cause; and

b) a source cell information.

7. The RRC connection resume method of claim 1, wherein the RRC resume response comprises at least one of:

a) a data packet acknowledgement (ACK) or Non-acknowledgement (NACK); and

b) an area update response.

8. The RRC connection resume method of claim 1, further comprising:

transmitting, by the UE, an area update request to the second base station;

performing, by the second base station, an area update procedure with other network entities when the area update request is received;

receiving, by the UE, an area update response from the second base station.

9. The RRC connection resume method of claim 4, further comprising:

starting, by the UE, the RRC resume validity timer when the RRC resume validity timer in the RRC suspend message is received; and

removing, by the UE, at least a part of UE context when the RRC resume validity timer expires.

10. A user equipment (UE), comprising:

a processor configured to;

receive an RRC suspend message from a first base station;

perform an RRC resume procedure with a second base station in response to the RRC suspend message; and

receive an RRC resume response from the second base station.

11. The UE of claim 10, wherein the RRC suspend message comprises at least one of:

a) a target cell information;

b) a target radio access technology information;

c) an area information; and

d) an RRC resume validity timer.

12. The UE of claim 11, wherein the target radio access technology information comprises a bandwidth part configuration, and the bandwidth part configuration includes at least one of:

a) a bandwidth configuration;

b) a numerology information; and

c) a coverage enhancement level information.

13. The UE of claim 10, wherein the processor is further configured to transmit an RRC resume request to the second base station, and the RRC resume request comprises at least one of:

a) an RRC resume request cause; and

b) a source cell information.

14. The UE of claim 10, wherein the RRC resume response comprises at least one of:

a) a data packet acknowledgement (ACK) or Non-acknowledgement (NACK); and

b) an area update response.

15. The UE of claim 10, wherein the processor is further configured to:

transmit an area update request to the second base station; and

receive an area update response from the second base station.

16. The UE of claim 11, wherein the processor is further configured to:

starting the RRC resume validity timer when the RRC resume validity timer in the RRC suspend message is received; and

remove at least a part of UE context when the RRC resume validity timer expires.

17. A base station, comprising:

a processor configured to;

transmit an RRC suspend message to a user equipment (UE);

receive a UE context fetch request from a second base station; and

transmit a UE context fetch response to the second base station in response to the UE context fetch request.

18. The base station of claim 17, wherein the base station and the second base station is realized by different radio access numerologies, one of the base station and the second base station is a wide-band numerology and another one is a narrow-band-Internet-of-Things numerology.

19. The base station of claim 17, wherein the base station and the second base station is realized by different radio access technologies, and one of the base station and the second base station is a narrow-band-Internet-of-Things numerology.

20. The base station of claim 17, wherein the RRC suspend message comprises at least one of:

a) a target cell information;

b) a target radio access technology information;

c) an area information; and

d) an RRC resume validity timer.

21. The base station of claim 20, wherein the target radio access technology information comprises a bandwidth part configuration, and the bandwidth part configuration includes at least one of:

a) a bandwidth configuration;

b) a numerology information; and

c) a coverage enhancement level information.

22. The base station of claim 17, wherein the processor is further configured to:

receive an area update request from the second base station; and

transmit an area update response to the second base station in response to the area update request.

23. The base station of claim 20, wherein the processor is further configured to:

starting the RRC resume validity timer when the RRC resume validity timer in the RRC suspend message is transmitted; and

remove at least a part of UE context when the RRC resume validity timer expires.

24. A base station, comprising:

a processor configured to;

receive an RRC resume request from a user equipment (UE);

transmit a UE context fetch request to a second base station in response to the RRC resume request;

receive a UE context fetch response from the second base station; and

transmit an RRC resume response to the UE in response to the UE context fetch response.

25. The base station of claim 24, wherein the base station and the second base station is realized by different radio access numerologies, one of the base station and the second base station is a wide-band numerology and another one is a narrow-band-Internet-of-Things numerology.

26. The base station of claim 24, wherein the base station and the second base station is realized by different radio access technologies, and one of the base station and the second base station is a narrow-band-Internet-of-Things numerology.

27. The base station of claim 24, wherein the RRC resume request comprises at least one of:

a) an RRC resume request cause; and

b) a source cell information.

28. The base station of claim 24, wherein the RRC resume response comprises at least one of:

a) a data packet acknowledgement (ACK) or Non-acknowledgement (NACK); and

b) an area update response.

29. The base station of claim 24, wherein the processor is further configured to:

receive an area update request from the UE;

perform an area update procedure with other network entities when the area update request is received; and

transmit an area update response to the UE.