本發明係有關於一種無線網路中降低通訊初始延遲之系統及方法，係用於一網路節點透過一伺服器呼叫在一無線網路基地台所涵蓋之一無線終端。無線終端告知該伺服器其省電模式下之聆聽間隔，之後無線終端每隔該聆聽間隔之時間起來聆聽該無線網路基地台傳送之訊號，當發現有欲傳送給該無線終端之封包緩衝在該基地台中，則接收該封包；伺服器依據該聆聽間隔而得知該無線終端往後起來聆聽該無線網路基地台之聆聽時間；當網路節點呼叫該無線終端時，該伺服器根據所得知之該無線終端往後起來聆聽該無線網路基地台之聆聽時間，以先暫存該連線要求一段時間，而在該聆聽時間即將到達時，傳送該連線要求給該無線終端。 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.
技術摘要-中文: 本發明係有關於一種無線網路中降低通訊初始延遲之系統及方法，係用於一網路節點透過一伺服器呼叫在一無線網路基地台所涵蓋之一無線終端。無線終端告知該伺服器其省電模式下之聆聽間隔，之後無線終端每隔該聆聽間隔之時間起來聆聽該無線網路基地台傳送之訊號，當發現有欲傳送給該無線終端之封包緩衝在該基地台中，則接收該封包；伺服器依據該聆聽間隔而得知該無線終端往後起來聆聽該無線網路基地台之聆聽時間；當網路節點呼叫該無線終端時，該伺服器根據所得知之該無線終端往後起來聆聽該無線網路基地台之聆聽時間，以先暫存該連線要求一段時間，而在該聆聽時間即將到達時，傳送該連線要求給該無線終端。 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.
Asynchronous power management methods and systems for a first station and a second station in a wireless network. The second station dynamically tunes a SRI (Schedule Repetition Interval) value according to residual power status, quality-of-service requirements, or other considerations. The SRI value is an odd prime number. Once the SRI is determined, the second station sets the number and positions of ABIs (Awake Beacon Intervals)" within an SRI. An ABI-set defined as the positions of ABIs in an SRI forms a cyclic difference set comprising at least two consecutive BIs. The second station transmits a beacon frame within a beacon window. When the first station has recently received the beacon frame from the second station, the first station predicts the awake/sleep schedule of the second station, and transmits data frames to the second station at the ABI of the second station.
技術摘要-英文: Asynchronous power management methods and systems for a first station and a second station in a wireless network. The second station dynamically tunes a SRI (Schedule Repetition Interval) value according to residual power status, quality-of-service requirements, or other considerations. The SRI value is an odd prime number. Once the SRI is determined, the second station sets the number and positions of ABIs (Awake Beacon Intervals)" within an SRI. An ABI-set defined as the positions of ABIs in an SRI forms a cyclic difference set comprising at least two consecutive BIs. The second station transmits a beacon frame within a beacon window. When the first station has recently received the beacon frame from the second station, the first station predicts the awake/sleep schedule of the second station, and transmits data frames to the second station at the ABI of the second station.
Adaptive power management methods and systems for a first station and a second station in a wireless network. Each station operating in the power-saving (PS) mode adaptively determines a “listen interval” (LI) according to residual power state, quality-of-service requirements, or other considerations. The LI is composed of a “normal beacon interval” (NBI) followed by the combination of “beacon-window-only beacon intervals” (BBIs) and “sleep beacon intervals” (SBIs). The LI value is one or a prime number which is larger than two, and the positions of the NBI and BBIs in an LI form a cyclic difference set. Each station broadcasts a beacon frame comprising at least information about “the remaining number of BIs (RBI)” within a beacon window. Once the first station correctly receives the beacon frame from the second station, the first station predicts the awake/sleep schedule of the second station, and transmits data frames to the second station at the NBI of the second station.
技術摘要-英文: Adaptive power management methods and systems for a first station and a second station in a wireless network. Each station operating in the power-saving (PS) mode adaptively determines a “listen interval” (LI) according to residual power state, quality-of-service requirements, or other considerations. The LI is composed of a “normal beacon interval” (NBI) followed by the combination of “beacon-window-only beacon intervals” (BBIs) and “sleep beacon intervals” (SBIs). The LI value is one or a prime number which is larger than two, and the positions of the NBI and BBIs in an LI form a cyclic difference set. Each station broadcasts a beacon frame comprising at least information about “the remaining number of BIs (RBI)” within a beacon window. Once the first station correctly receives the beacon frame from the second station, the first station predicts the awake/sleep schedule of the second station, and transmits data frames to the second station at the NBI of the second station.
