APPARATUS AND METHOD FOR SIGNALING SYSTEM INFORMATION

• US 20190132884A1
• Filed: 12/21/2018
• Published: 05/02/2019
• 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 10,531,496 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 SI which is broadcasted periodically, the first SI including information indicating whether a SI message for second SI is to be transmitted on demand;

transmitting, to the BS, a physical random access channel (PRACH) preamble;

receiving, from the BS, a random access response (RAR) message including an uplink (UL) grant in response to the PRACH preamble;

if the information indicates that the SI message for the second SI is to be transmitted on demand, transmitting, to the BS, an SI request message to request the second SI in the UL grant; and

receiving, from the BS, the SI message for the second SI in response to the SI request message.

2. The method of claim 1,

wherein the SI message is provided within a time window after transmitting the SI request message, and

wherein a length of the time window is included in the first SI.

3. The method of claim 1, further comprising:

monitoring a SI window of a SI-block (SIB) for the SI message in one or more SI periods of the SIB.

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

5. The method of claim 1, further comprising:

receiving, from the BS, an SI area ID corresponding to a set of cells having a same SI configuration.

9. The method of claim 1, further comprising:

transmitting, to the UE, an SI area ID corresponding to a set of cells having a same SI configuration.

6. 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 SI which is broadcasted periodically, the first SI including information indicating whether a SI message for second SI is to be transmitted on demand;

receiving, from the UE, a physical random access channel (PRACH) preamble;

transmitting, to the UE, a random access response (RAR) message including an uplink (UL) grant in response to the PRACH preamble;

if the information indicates that the SI message for the second SI is to be transmitted on demand, receiving, from the UE, an SI request message to request the second SI in the UL grant; and

transmitting, to the UE, the SI message for the second SI in response to the SI request message.

7. The method of claim 6,

wherein the SI message is provided within a time window after transmitting the SI request message, and

wherein a length of the time window is included in the first SI.

8. The method of claim 6, wherein the first SI includes an SI configuration ID corresponding to a set of SI used in a cell.

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

a transceiver; and

a controller coupled with the transceiver and configured to control to;

receive, from a base station (BS), first SI which is broadcasted periodically, the first SI including information indicating whether a SI message for second SI is to be transmitted on demand,

transmit, to the BS, a physical random access channel (PRACH) preamble,

receive, from the BS, a random access response (RAR) message including an uplink (UL) grant in response to the PRACH preamble,

if the information indicates that the SI message for the second SI is to be transmitted on demand, transmit, to the BS, an SI request message to request the second SI in the UL grant, and

receive, from the BS, the SI message for the second SI in response to the SI request message.

11. The UE of claim 10,

wherein the SI message is provided within a time window after transmitting the SI request message, and

wherein a length of the time window is included in the first SI.

12. The UE of claim 10, wherein the controller is further configured to:

monitor a SI window of a SI-block (SIB) for the SI message in one or more SI periods of the SIB.

13. The UE of claim 10, wherein the first SI includes an SI configuration ID corresponding to a set of SI used in a cell.

14. The UE of claim 10, wherein the controller is further configured to:

receive, from the BS, an SI area ID corresponding to a set of cells having a same SI configuration.

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

a transceiver; and

a controller coupled with the transceiver and configured to control to;

transmit, to a user equipment (UE), first SI which is broadcasted periodically, the first SI including information indicating whether a SI message for second SI is to be transmitted on demand,

receive, from the UE, a physical random access channel (PRACH) preamble,

transmit, to the UE, a random access response (RAR) message including an uplink (UL) grant in response to the PRACH preamble,

if the information indicates that the SI message for the second SI is to be transmitted on demand, receive, from the UE, an SI request message to request the second SI in the UL grant, and

transmit, to the UE, the SI message for the second SI in response to the SI request message.

16. The BS of claim 15,

wherein the SI message is provided within a time window after transmitting the SI request message, and

wherein a length of the time window is included in the first SI.

17. The BS of claim 15, wherein the first SI includes an SI configuration ID corresponding to a set of SI used in a cell.

18. The BS of claim 15, wherein the controller is further configured to:

transmit, to the UE, an SI area ID corresponding to a set of cells having a same SI configuration.