APPARATUS AND METHOD FOR SIGNALING SYSTEM INFORMATION

• US 20170251500A1
• Filed: 02/27/2017
• Published: 08/31/2017
• Est. Priority Date: 02/29/2016
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: AGIWAL, Anil, CHANG, Youngbin
• Granted Patent: US 10,455,621 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The present disclosure relates to a communication method and system for converging a 5^th-generation (5G) communication system for supporting higher data rates beyond a 4^th-generation (4G) system with a technology for internet of things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method for receiving system information (SI) by a user equipment (UE) in a wireless communication system is provided. The method includes receiving, from a base station (BS), first type SI associated with SI which is essential for communication with the BS, transmitting, to the BS, a physical random access channel (PRACH) preamble based on the first type SI, receiving, from the BS, a random access response (RAR) message, and receiving, from the BS, second type SI associated with at least one SI which the UE needs.

Claims

1. A method for receiving system information (SI) by a user equipment (UE) in a wireless communication system, the method comprising:

receiving, from a base station (BS), first type SI associated with SI which is essential for communication with the BS;

transmitting, to the BS, a physical random access channel (PRACH) preamble based on the first type SI;

receiving, from the BS, a random access response (RAR) message; and

receiving, from the BS, second type SI associated with at least one SI which the UE needs.

2. The method of claim 1, further comprising:

transmitting, to the BS, an SI request message indicating the at least one system information which the UE needs.

3. The method of claim 1, wherein the first type SI includes an indicator indicating whether the second type SI is periodically broadcasted or provided on demand.

4. The method of claim 3,

wherein the indicator comprises a single indication which indicates that SI in the second type SI are either periodically broadcasted or are provided on demand;

or

wherein the indicator comprises multiple indications which indicates that each SI in the second type SI is either periodically broadcasted or provided on demand.

5. The method of claim 1, further comprising:

selecting the PRACH preamble specific to the at least one SI which the UE needs, the at least one SI being associated with the second type SI.

6. The method of claim 1, further comprising:

selecting the PRACH preamble specific to third type SI indicated in the first type SI;

receiving, from the BS, the third type SI after transmitting the PRACH preamble; and

transmitting, to the BS, an SI request message associated with the second type SI after receiving the RAR message.

7. The method of claim 6, wherein the RAR message includes at least one of the third type SI and uplink grant.

8. The method of claim 2, wherein the second type SI is provided within a time window after transmitting the SI request message indicating the at least one SI which the UE needs.

9. The method of claim 8, wherein a length of the time window is included in the first type SI.

10. The method of claim 2, further comprising:

monitoring a time window of the second type SI in predetermined one or more periods after transmitting the SI request message.

11. The method of claim 1, wherein the first type SI includes an SI configuration ID corresponding to a set of SI used in a cell.

12. The method of claim 1, wherein the first type SI includes an SI area ID corresponding to a set of cells having a same SI configuration.

13. A method for transmitting system information (SI) by a base station (BS) in a wireless communication system, the method comprising:

transmitting, to a user equipment (UE), first type SI associated with SI which is essential for communication with the UE;

receiving, from the UE, a physical random access channel (PRACH) preamble based on the first type SI;

transmitting, to the UE, a random access response (RAR) message; and

transmitting, to the UE, second type SI associated with at least one SI which the UE needs.

14. The method of claim 13, further comprising:

receiving, from the UE, an SI request message indicating the at least one SI which the UE needs.

15. The method of claim 13, wherein the first type SI includes an indicator indicating whether the second type SI is periodically broadcasted or provided on demand.

16. A user equipment (UE) for receiving system information (SI) in a wireless communication system, the UE comprising:

a transceiver configured to transmit and receive a signal; and

at least one processor configured to;

control receiving, from a base station (BS), first type SI associated with SI which is essential for communication with the BS,

control transmitting, to the BS, a physical random access channel (PRACH) preamble based on the first type SI,

control receiving, from the BS, a random access response (RAR) message, and

control receiving, from the BS, second type SI associated with at least one SI which the UE needs.

17. The UE of claim 16, wherein the first type SI includes an indicator indicating whether the second type SI is periodically broadcasted or provided on demand.

18. The UE of claim 16, wherein the at least one processor is further configured to select the PRACH preamble specific to the at least one SI which the UE needs, the at least one SI being associated with the second type SI.

19. A base station (BS) for transmitting system information (SI) in a wireless communication system, the BS comprising:

a transceiver configured to transmit and receive a signal; and

at least one processor configured to;

control transmitting, to a user equipment (UE), first type SI associated with SI which is essential for communication with the UE,

control receiving, from the UE, a physical random access channel (PRACH) preamble based on the first type SI,

control transmitting, to the UE, a random access response (RAR) message, and

control transmitting, to the UE, second type SI associated with at least one SI which the UE needs.

20. The BS of claim 19,

wherein the at least one processor is further configured to control receiving, from the UE, an SI request message indicating the at least one SI which the UE needs, and

wherein the first type SI includes an indicator indicating whether the second type SI is periodically broadcasted or provided on demand.