Patent ID: 9391760
Filing Date: 2016-07-12
CPC Classification: H04L,H04W

Claim Text:
1. A method for accessing a wireless network, comprising a synchronization acquiring process including: detecting a physical frame on a current subchannel; parsing a system information channel SICH and a control channel CCH in the detected physical frame, wherein the SICH indicates a structure of the physical frame, a location and time length of the CCH in the physical frame is determined by parsing the SICH, and the CCH indicates system resource allocation; and acquiring a system parameter from the physical frame by using a result of the parsing; wherein, the synchronization acquiring process further comprises: turning to a next subchannel and continuing to detect a physical frame until each subchannel in a channel list is detected, after acquiring the system parameter; and taking all subchannels, from which the system parameter has been acquired, as available subchannels, and selecting any one from the available subchannels; wherein, the method further comprises a synchronization maintaining process, which includes: continuing to detect a physical frame on the selected subchannel; parsing the SICH and the CCH in the detected physical frame; and detecting a broadcast information frame BCF from the detected physical frame by using a result of the parsing, to acquire a system parameter; wherein, the synchronization maintaining process further comprises: starting an SICH timer and a BCF timer when detecting the physical frame is started; determining whether the SICH is successfully parsed before the SICH timer is expired, and if so, resetting the SICH timer; otherwise, the synchronization acquiring process is performed again starting from the selected subchannel according to the channel list, until a system parameter is acquired on a subchannel, which is then taken as the selected subchannel for performing the synchronization maintaining process again; and determining whether the BCF is detected before the BCF timer is expired, and if so, resettingthe BCF timer and continuing to detect a physical frame on the selected subchannel; otherwise, the synchronization acquiring process is performed again starting from the selected subchannel according to the channel list, until a system parameter is acquired on a subchannel, which is then taken as the selected subchannel for performing the synchronization maintaining process again; or the synchronization maintaining process further comprises: starting an SICH timer and a BCF timer when starting to detect a physical frame; determining whether the SICH is parsed successfully before the SICH timer is expired, and if so, resetting the SICH timer; otherwise, performs the synchronization acquiring process again according to the channel list; and determining whether the BCF is detected before the BCF timer is expired, and if so, resetting the BCF timer and continuing to detect a physical frame on the selected subchannel; otherwise, performing the synchronization acquiring process according to the channel list; or the synchronization maintaining process further comprises: starting an SICH timer and a BCF timer when starting to detect a physical frame; determining whether the SICH is parsed successfully before the SICH timer is expired, and if so, resetting the SICH timer; otherwise, reselecting a subchannel from the available subchannels to perform the synchronization maintaining process; and determining whether the BCF is detected before the BCF timer is expired, and if so, resetting the BCF timer and continuing to detect a physical frame on the selected subchannel; otherwise, reselecting a subchannel from the available subchannels to perform the synchronization maintaining process.