Method of transmitting/receiving LTE system information in a wireless communication system
In a wireless mobile communications system, the system information is grouped or classified in different types according to the characteristics of the system information, and the system information is transmitted to channels with specific functions that allow the optimization of the resource usage and the reception by the User Equipment (UE).
1. A method of broadcasting system information in a Long Term Evolution (LTE) mobile communication system, the method comprising:
classifying the system information into a first portion and a second portion based on characteristics of the system information, the first portion comprising scheduling information;
broadcasting the first portion of the system information via a first type of common transport channel; and
transmitting the second portion of the system information via a second type of common transport channel based on the scheduling information,
wherein the first type of common transport channel is a Broadcast Channel (BCH) which is a statically scheduled common transport channel,
wherein the second type of common transport channel is a Downlink Shared Channel (DL-SCH) which is a flexibly scheduled common transport channel, and
wherein broadcasting the first portion of the system information comprises broadcasting the first portion using not more than half of a cell bandwidth of the LTE mobile communication system.
2. The method of claim 1 , wherein the system information is classified into primary system information and secondary system information.
3. The method of claim 2 , wherein the primary system information includes at least Public Land Mobile Network (PLMN) information or the scheduling information of the secondary system information.
4. The method of claim 1 , wherein the system information is classified into cell-level system information and PLMN-level system information.
5. The method of claim 4 , wherein the system information is the cell-level system information when a content of the system information is used or valid to a specific cell.
6. The method of claim 4 , wherein the system information is the PLMN-level system information when a content of the system information is commonly used or valid to multiple cells within a PLMN area.
7. The method of claim 4 , wherein the cell-level system information is either dynamic system information or semi-static system information.
8. The method of claim 7 , wherein the cell-level system information is the dynamic system information when a content of the cell-level system information is frequently changed.
9. The method of claim 7 , wherein the cell-level system information is the semi-static system information when a content of the cell-level system information is not frequently changed.
10. The method of claim 2 , wherein at least the primary system information is transmitted via the BCH or the secondary system information is transmitted via the DL-SCH.
11. A method of receiving system information in a Long Term Evolution (LTE) mobile communication system, the method comprising:
receiving a broadcast of a first portion of the system information via a first type of common transport channel, the first portion comprising scheduling information; and
receiving a second portion of the system information via a second type of common transport channel based on the scheduling information,
wherein the first type of common transport channel is a Broadcast Channel (BCH) which is a statically scheduled common transport channel,
wherein the second type of common transport channel is a Downlink Shared Channel (DL-SCH) which is a flexibly scheduled common transport channel, and
wherein the broadcast of the first portion of the system information uses not more than half of a cell bandwidth of the LTE mobile communication system.
12. The method of claim 11 , wherein the system information was classified into primary system information and secondary system information.
13. The method of claim 12 , wherein the primary system information includes at least Public Land Mobile Network (PLMN) information or the scheduling information of the secondary system information.
14. The method of claim 11 , wherein the system information was classified into cell-level system information and PLMN-level system information.
15. The method of claim 14 , wherein the cell-level system information is either dynamic system information or semi-static system information.
16. The method of claim 12 , wherein at least the primary system information is received via the BCH or the secondary system information is received via the DL-SCH.
17. The method of claim 1 ,
wherein the cell bandwidth of the LTE mobile communication system equals 20 MHz, and
wherein the first portion of the system information is broadcast using not more than half of the 20 MHz cell bandwidth.
18. The method of claim 11 ,
wherein the cell bandwidth of the LTE mobile communication system equals 20 MHz, and
wherein the broadcast of the first portion of the system information uses not more than half of the 20 MHz cell bandwidth.