System and method for reducing call establishment delay in a wireless network
First Claim
1. A method for reducing call establishment delay in a wireless network, which is used in a network node to call a wireless terminal covered by a wireless network access point/base station through a Session Initiation Protocol (SIP) server, the method comprising:
- a listen interval notifying step, which uses the wireless terminal to notify the SIP server of a listen interval;
a listen time determining step, which uses the SIP server to obtain a listen time according to the listen interval, so that the SIP server is aware of when the wireless terminal subsequently wakes up and listens to the wireless network access point/base station; and
a connection request sending step, which uses the SIP server to dynamically determine a time to send a connection request to the wireless terminal.
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Accused Products
Abstract
A system and method for reducing call establishment delay in wireless network is provided, in which a network node establishes a call to a wireless terminal controlled by an AP via a server. The wireless terminal notifies the server of its listen interval. In the power saving mode, the wireless terminal wakes up every listen interval and listen the beacon to check whether any buffered packet for it. When the wireless terminal learns from the beacon that there are packets waiting, it communicates with the access point to retrieve them. The server records a listen time at which the wireless terminal will wake up and listen to the AP based on the listen interval. When a network node calls the wireless terminal, the server buffers the request for a time interval based on the listen time, and then sends the request to the wireless terminal.
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Citations
20 Claims
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1. A method for reducing call establishment delay in a wireless network, which is used in a network node to call a wireless terminal covered by a wireless network access point/base station through a Session Initiation Protocol (SIP) server, the method comprising:
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a listen interval notifying step, which uses the wireless terminal to notify the SIP server of a listen interval; a listen time determining step, which uses the SIP server to obtain a listen time according to the listen interval, so that the SIP server is aware of when the wireless terminal subsequently wakes up and listens to the wireless network access point/base station; and a connection request sending step, which uses the SIP server to dynamically determine a time to send a connection request to the wireless terminal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for reducing call establishment delay in a wireless network, comprising:
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a wireless terminal; a wireless network access point/base station, which covers the wireless terminal; at least one Session Initiation Protocol (SIP) server; and a network node, which calls the wireless terminal through the SIP server; wherein the wireless terminal notifies the SIP server of its listen interval, the SIP server obtains a listen time according to the listen interval and accordingly is aware of when the wireless terminal subsequently wakes up and listens to the wireless network access point/base station, and when the network node calls the wireless terminal, the SIP server dynamically determines a time to send a connection request to the wireless terminal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for reducing call establishment delay in a wireless network, which is used in a network node to call a wireless terminal covered by a wireless network access point/base station through a Session Initiation Protocol (SIP) server, the method comprising:
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a wireless terminal inquiring step, which uses the wireless terminal to send an inquiry request to the SIP server for inquiring retransmission information; a SIP server responding step, which uses the SIP server to send an inquiry response containing an inquiry result to the wireless terminal such that the wireless terminal determines a listen time according to the inquiry result for waking up to receive data; and a connection request sending step, which uses the SIP server to dynamically determine a time to send a connection request to the wireless terminal. - View Dependent Claims (15, 16)
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17. A system for reducing call establishment delay in a wireless network, comprising:
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a wireless terminal; a wireless network access point/base station, which covers the wireless terminal; at least one Session Initiation Protocol (SIP) server; and a network node, which uses the SIP server to call the wireless terminal; wherein the wireless terminal sends an inquiry request to the SIP server for inquiring retransmission information and accordingly determines a listen time to wake up and receive data, and the SIP server sends an inquiry response containing an inquiry result to the wireless terminal in response to the inquiry request received and dynamically determines a time to send a connection request to the wireless terminal. - View Dependent Claims (18, 19, 20)
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Specification