Method and apparatus for performing cell (re)selection in a wireless communication system
A method of wireless communication is provided. The method includes transmitting an RRC system information request message to a cell; receiving a minimum required received level factor and an offset via system information, the offset being included in at least one of a SIB3 and a SIB4; obtaining a minimum required received level based on the minimum required received level factor and on the offset multiplied by an integer larger than one; determining a cell selection criterion based on the minimum required received level; and performing inter-frequency cell reselection according to the cell selection criterion when the offset is received in first neighboring cell related information for the inter-frequency cell reselection in the SIB4. A user equipment using such method is also provided.
1. A user equipment (UE) for wireless communication, the UE comprising:
one or more non-transitory computer-readable media storing one or more computer-executable instructions; and
at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:
transmit a Radio Resource Control (RRC) system information request message to a cell;
receive a minimum required received level factor and an offset via system information, the offset being included in at least one of a System Information Block 3 (SIB3) and a System Information Block 4 (SIB4);
obtain a minimum required received level based on the minimum required received level factor and on the offset multiplied by an integer larger than one;
determine a cell selection criterion based on the minimum required received level; and
perform inter-frequency cell reselection according to the cell selection criterion when the offset is received in first neighboring cell related information for the inter-frequency cell reselection in the SIB4.
2. The UE of claim 1 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
perform intra-frequency cell reselection when the offset is received in second neighboring cell related information for the intra-frequency cell reselection in the SIB3.
3. A base station for wireless communication, the base station comprising:
one or more non-transitory computer-readable media storing one or more computer-executable instructions; and
at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:
receive, from a user equipment (UE), a Radio Resource Control (RRC) system information request message;
transmit a minimum required received level factor via system information to the UE; and
transmit, in response to the RRC system information request message received from the UE, an offset in first neighboring cell related information for inter-frequency cell reselection in a System Information Block 4 (SIB4).
4. The base station of claim 3 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
transmit the offset in second neighboring cell related information for intra-frequency cell reselection in a System Information Block 3 (SIB3).
5. A method performed by a user equipment (UE) for wireless communication, the method comprising:
transmitting a Radio Resource Control (RRC) system information request message to a cell;
receiving a minimum required received level factor and an offset via system information, the offset being included in at least one of a System Information Block 3 (SIB3) and a System Information Block 4 (SIB4);
obtaining a minimum required received level based on the minimum required received level factor and on the offset multiplied by an integer larger than one;
determining a cell selection criterion based on the minimum required received level; and
performing inter-frequency cell reselection according to the cell selection criterion when the offset is received in first neighboring cell related information for the inter-frequency cell reselection in the SIB4.
6. The method of claim 5 , further comprising:
performing intra-frequency cell reselection when the offset is received in second neighboring cell related information for the intra-frequency cell reselection in the SIB3.
7. A method performed by a base station for wireless communication, the method comprising:
receiving, from a user equipment (UE), a Radio Resource Control (RRC) system information request message;
transmitting a minimum required received level factor via system information to the UE; and
transmitting, in response to the RRC system information request message received from the UE, an offset in first neighboring cell related information for inter-frequency cell reselection in a System Information Block 4 (SIB4).
8. The method of claim 7 , further comprising:
transmitting the offset in second neighboring cell related information for intra-frequency cell reselection in a System Information Block 3 (SIB3).