Network accessing method and communications apparatus utilizing the same
地域：
Hsin-Chu
摘要
A network accessing method includes performing a cell search procedure for a first RAT; receiving first SI from a first cell of the first RAT when the first cell has been found in the cell search procedure; determining whether second SI is scheduled by the first cell according to content of the first SI; receiving the second SI in response to determination of the second SI being scheduled and deriving information regarding a second cell of a second RAT different from the first RAT; searching for the second cell according to the information regarding the second cell; and attempting to access the second cell instead of the first cell when the second cell has been found. The first cell is configured to provide access to a first core network and the second cell is configured to provide access to a second core network different from the first core network.
說明書
The fifth generation (5G) communication standard is the next generation communication standard of the fourth generation (4G), such as the LTE (Long Term Evolution) and LTE-Advanced. One purpose of the new radio (NR) access technology in the fifth generation is to realize tight interworking between the LTE system and the LTE-Advanced system and the NR system. As a technology candidate for realizing this close cooperation, dual connectivity by an LTE system or an LTE-Advanced system (hereinafter referred to as an LTE system) and an NR system is considered.
In Evolved Universal Terrestrial Radio Access (EUTRA)-NR Dual Connectivity (EN-DC), LTE would become a Master Cell Group (MCG) and NR would become a Secondary Cell Group (SCG). MCG works as the anchor and User Equipment (UE) performs initial registration to this anchor cell group, and this anchor cell adds one or more secondary cells. Therefore, for NR non-standalone (NSA) mode, UE camps on LTE cell first and wait for the network to configure EN-DC on NR cell. On the other hand, for standalone (SA) mode, UE can directly camp on NR cell during idle mode.
權利要求
What is claimed is:1. A communications apparatus, comprising:a radio transceiver, transmitting or receiving wireless signals in a wireless network; and a processor, coupled to the radio transceiver and configured to perform operations comprising: performing a cell search procedure for a first Radio Access Technology (RAT) in the wireless network; receiving first system information from a first cell of the first RAT based on a search result indicating that the first cell has been found in the cell search procedure for the first RAT; determining whether second system information is scheduled by the first cell according to content of the first system information; receiving the second system information based on determination of the second system information being scheduled by the first cell and deriving information regarding a second cell of a second RAT different from the first RAT based on the second system information; searching for the second cell of the second RAT according to the information regarding the second cell of the second RAT; and attempting to access the second cell instead of the first cell based on a search result indicating that the second cell of the second RAT has been found in the search for the second cell of the second RAT, wherein the first cell is configured to provide access to a first core network and the second cell is configured to provide access to a second core network different from the first core network. 2. The communications apparatus of claim 1 , wherein the processor is further configured to perform the operations comprising:not attempting to access the first cell until determining that the second system information is not scheduled by the first cell. 3. The communications apparatus of claim 1 , wherein the processor is configured to perform the operations of receiving the second system information and deriving the information regarding the second cell of the second RAT without attempting to access the first cell. 4. The communications apparatus of claim 3 , wherein the processor is further configured to perform operations comprising:attempting to access the first cell based on a search result indicating that the second cell of the second RAT has not been found in the search for the second cell of the second RAT. 5. The communications apparatus of claim 1 , wherein the processor is configured to perform the operations of receiving the second system information and deriving the information regarding the second cell of the second RAT while attempting to access the first cell but hiding the attempt from user. 6. The communications apparatus of claim 5 , wherein the processor is further configured to perform operations comprising:stopping accessing the first cell based on the search result indicating that the second cell of the second RAT has been found in the search for the second cell of the second RAT. 7. The communications apparatus of claim 1 , wherein the processor is further configured to perform operations comprising:performing a cell search procedure for the second RAT in the wireless network before performing the cell search procedure for the first RAT, wherein the cell search procedure for the first RAT is performed when no cell of the second RAT has been found in the cell search procedure for the second RAT; and determining whether the second cell has been searched in the cell search procedure for the second RAT after deriving the information regarding the second cell of the second RAT based on the second system information. 8. The communications apparatus of claim 7 , wherein the processor is configured to search for the second cell of the second RAT according to the information regarding the second cell of the second RAT based on determination of the second cell has not been searched in the cell search procedure for the second RAT. 9. The communications apparatus of claim 7 , wherein the processor is further configured to perform operations comprising:attempting to access the first cell based on determination of the second cell has been searched in the cell search procedure for the second RAT. 10. The communications apparatus of claim 1 , wherein the second system information comprises System Information Block (SIB) 24 broadcasted by the first cell. 11. A network accessing method, comprising:performing a cell search procedure for a first Radio Access Technology (RAT); receiving first system information from a first cell of the first RAT based on a search result indicating that the first cell has been found in the cell search procedure for the first RAT; determining whether second system information is scheduled by the first cell according to content of the first system information; receiving the second system information based on determination of the second system information being scheduled by the first cell and deriving information regarding a second cell of a second RAT different from the first RAT based on the second system information; searching for the second cell of the second RAT according to the information regarding the second cell of the second RAT; and attempting to access the second cell instead of the first cell based on a search result indicating that the second cell of the second RAT has been found in the search for the second cell of the second RAT, wherein the first cell is configured to provide access to a first core network and the second cell is configured to provide access to a second core network different from the first core network. 12. The network accessing method of claim 11 , further comprising:not attempting to access the first cell until determining that the second system information is not scheduled by the first cell. 13. The network accessing method of claim 11 , wherein step of receiving the second system information based on determination of the second system information being scheduled by the first cell and deriving the information regarding the second cell of the second RAT different from the first RAT based on the second system information is performed without an attempt to access the first cell. 14. The network accessing method of claim 13 , further comprising:attempting to access the first cell based on a search result indicating that the second cell of the second RAT has not been found in the search for the second cell of the second RAT. 15. The network accessing method of claim 11 , wherein step of receiving the second system information based on determination of the second system information being scheduled by the first cell and deriving the information regarding the second cell of the second RAT different from the first RAT based on the second system information is performed while attempting to access the first cell but hiding the attempt from user. 16. The network accessing method of claim 15 , further comprising:stopping accessing the first cell based on the search result indicating that the second cell of the second RAT has been found in the search for the second cell of the second RAT. 17. The network accessing method of claim 11 , further comprisingperforming a cell search procedure for the second RAT before performing the cell search procedure for the first RAT, wherein step of performing the cell search procedure for the first RAT is performed when no cell of the second RAT has been found in the cell search procedure for the second RAT; and determining whether the second cell has been searched in the cell search procedure for the second RAT after the information regarding the second cell of the second RAT has been derived based on the second system information. 18. The network accessing method of claim 17 , further comprising:searching for the second cell of the second RAT according to the information regarding the second cell of the second RAT based on determination of the second cell has not been searched in the cell search procedure for the second RAT. 19. The network accessing method of claim 17 , further comprising:attempting to access the first cell based on determination of the second cell has been searched in the cell search procedure for the second RAT. 20. The network accessing method of claim 11 , wherein the second system information comprises System Information Block (SIB) 24 broadcasted by the first cell.
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