Method of acquiring system information in wireless communication system
A method of acquiring system information in a wireless communication system includes receiving scheduling system information including scheduling information indicating a start time of dynamic system information, monitoring the dynamic system information from a start time of the dynamic system information according to the scheduling system information, and ending the monitoring of the dynamic system information upon receiving a system information end indicator indicating an end time of the dynamic system information. Since an end time of dynamic system information is indicated, a process of acquiring system information can be further effectively performed.
1. A method of updating, by a user equipment (UE), a system information in a wireless communication system, the method comprising:
monitoring, by the UE, a physical downlink control channel (PDCCH);
receiving, by the UE from a base station (BS), a System Information Radio Network Temporary Identifier (SI-RNTI) via the PDCCH;
receiving, by the UE from the BS, first system information on a downlink shared channel (DL-SCH) in accordance with the SI-RNTI;
applying, by the UE, the first system information only until a second system information is received;
receiving, by the UE from the BS,
a paging message that includes a system information change notification indicating that the BS will change system information, and
a scheduling system information message that includes a value tag indicating that the BS has changed the system information,
wherein the paging message is received from the BS via a paging control channel (PCCH), and
wherein the scheduling system information message is received from the BS via the DL-SCH;
based on the system information change notification and the value tag, receiving, by the UE from the BS, the second system information on the DL-SCH in accordance with the SI-RNTI; and
applying the second system information by the UE.
2. The method of claim 1 , further comprising:
receiving a master system information comprising scheduling information for the scheduling system information.
3. The method of claim 2 , wherein the master system information is received via a broadcast control channel (BCCH) in a logical channel.
4. The method of claim 1 , wherein the second system information is received immediately following a start of a subsequent system information repetition period.
5. The method of claim 1 , wherein the user equipment is either in a radio resource control (RRC) idle mode or an RRC connected mode.
6. The method of claim 1 , further comprising:
decoding the SI-RNTI to obtain a system information window length and a system information transmission period.
7. The method of claim 1 , wherein the paging message is received when the UE is in one of a RRC idle mode or a RRC connected mode.
8. The method of claim 1 , wherein the step of receiving at least one of the paging message and the value tag comprises:
receiving the scheduling system information message after receiving the paging message.
9. The method of claim 1 , wherein the step of receiving at least one of the paging message and the value tag comprises:
receiving only one of the paging message and the scheduling system information message.
10. The method of claim 1 , wherein the scheduling system information message is received via the DL-SCH in accordance with the SI-RNTI.
11. A user equipment in a wireless communication system, the user equipment comprising:
a radio frequency (RF) unit; and
a processor operatively coupled to the RF unit, and configured to:
monitor a physical downlink control channel (PDCCH);
receive, from a base station (BS), a System Information Radio Network Temporary Identifier (SI-RNTI) via the PDCCH;
receive, from the BS, first system information on a downlink shared channel (DL-SCH) in accordance with the SI-RNTI;
apply the first system information only until a second system information is received;
receive, from the BS,
a paging message that includes a system information change notification indicating that the BS will change system information, and
a scheduling system information message that includes a value tag indicating that the BS has changed the system information,
wherein the paging message is received from the BS via a paging control channel (PCCH), and
wherein the scheduling system information message is received from the BS via the DL-SCH;
based on the system information change notification and the value tag, receive, from the BS, the second system information on the DL-SCH in accordance with the SI-RNTI; and
apply the second system information by the UE.
12. The user equipment of claim 11 , wherein the processor is further configured to:
receive a master system information comprising scheduling information for the scheduling system information.
13. The user equipment of claim 12 , wherein the master system information is received via a broadcast control channel (BCCH) in a logical channel.
14. The user equipment of claim 11 , wherein the second system information is received immediately following a start of a subsequent system information repetition period.
15. The user equipment of claim 11 , wherein the user equipment is either in a radio resource control (RRC) idle mode or a RRC connected mode.
16. The user equipment of claim 11 , wherein the processor is further configured to decode the SI-RNTI to obtain a system information window length and a system information transmission period.
17. The user equipment of claim 11 , wherein the paging message is received when the UE is in one of a RRC idle mode or a RRC connected mode.
18. The user equipment of claim 11 , wherein the processor receives the scheduling system information message after receiving the paging message.
19. The user equipment of claim 11 , wherein the processor receives only one of the paging message and the scheduling system information message.
20. The user equipment of claim 11 , wherein the scheduling system information message is received via the DL-SCH in accordance with the SI-RNTI.