-
公开(公告)号：BR0100224A
公开(公告)日：2001-10-02
申请号：BR0100224
申请日：2001-01-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
Abstract: The penalties associated with relying on layer-4 to handle packets lost as a result of a handoff can be reduced by forwarding, in response to a handoff request from a first base station to a second base station, at least one layer-2 frame of a layer-3 packet destined to/from the wireless terminal that has been passed down from layer-3 to layer-2, and so is indicated to have been transmitted at layer-3 even though not all of the layer-2 frames of the layer-3 packet have actually been transmitted. In one embodiment of the invention, each of the at least one layer-2 frames may be encapsulated together in a special layer-3 packet that is transferred from the first base to the second base station in the usual manner of inter-base-station communication. Advantageously, packets are not lost at layer-4 due to handoffs. Thus, layer-4 retransmissions are not required, and so delays in the network are reduced. Furthermore, if only the layer-2 frames that were not transmitted over the air to the wireless terminal by the first base station are transferred to the second base station, a savings may be had in use of the air interface.
-
公开(公告)号：AU1676901A
公开(公告)日：2001-08-16
申请号：AU1676901
申请日：2001-02-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
Abstract: The penalties associated with relying on layer-4 to handle packets lost as a result of a handoff can be reduced by forwarding, in response to a handoff request from a first base station to a second base station, at least one layer-2 frame of a layer-3 packet destined to/from the wireless terminal that has been passed down from layer-3 to layer-2, and so is indicated to have been transmitted at layer-3 even though not all of the layer-2 frames of the layer-3 packet have actually been transmitted. In one embodiment of the invention, each of the at least one layer-2 frames may be encapsulated together in a special layer-3 packet that is transferred from the first base to the second base station in the usual manner of inter-base-station communication. Advantageously, packets are not lost at layer-4 due to handoffs. Thus, layer-4 retransmissions are not required, and so delays in the network are reduced. Furthermore, if only the layer-2 frames that were not transmitted over the air to the wireless terminal by the first base station are transferred to the second base station, a savings may be had in use of the air interface.
-
公开(公告)号：BRPI0100211B1
公开(公告)日：2015-06-16
申请号：BR0100211
申请日：2001-01-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
-
公开(公告)号：CA2330709C
公开(公告)日：2005-08-30
申请号：CA2330709
申请日：2001-01-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
Abstract: At least portions of the map of the base stations, i.e., which base stations are neighbors, is discovered and updated using a wireless terminal controlled handoff process. The portion of the map that is discovered by a particular base station is typically its neighbors to which it can possibly hand off a call it is serving. It tak es at least one handoff with each such base station neighbor for the particular base station to discover its entire local map, i.e., all the base stations to which the particular base station can perform handoffs. The wireless terminal handoff process is used to supply a base station with information about other base stations with whom the base station can coopera te to perform handoffs. The handoff process may subsequently be performed more expeditiously between the particular base station and such other base statio ns using the obtained information. As part of the handoff process, the wireless terminal tells the new base station to which it is handing off the call the identity of the previou s base station from which control is being handed off. The wireless terminal then completes handoff and begins to be served by the new base station. If the new base station doe s not have a valid record for the previous base station, it forms a trust relationship wi th the previousbase station and creates a record for it, thus identifying it as a neighbor to which it can perform expedited handoff in response to the control of a wireless terminal.
-
公开(公告)号：DE60104222T2
公开(公告)日：2005-06-30
申请号：DE60104222
申请日：2001-01-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
Abstract: Paging areas aligned with wireless terminals are dynamically created. A first base station passes to the wireless terminal a list of all the base stations that it knows and are within a prescribed number of handoffs of the first base station. The wireless terminal uses this list to define its own "personal" paging area. Each time the wireless terminal emerges from a sleep state, it listens for the base station having the best signal and compares its identification against the list of base stations in its personal paging area. If the best signal base station is on the list, any paging messages for the wireless terminal are automatically broadcast by that base station. Otherwise, the wireless terminal must conduct a handoff to that base station to obtain a new personal paging area centered on that base station with that base station as paging agent. Messages originating elsewhere in the network are forwarded to the paging agent for delivery to the wireless terminal. The paging agent then instructs all known base stations within prescribed number of handoffs of it to page the wireless terminal. The wireless terminal, on hearing the page, will form a connection with the base station having the best signal for communicating. The base station having the best signal for communicating notifies the paging agent that it has established a connection with the wireless terminal, which leaves paging mode and becomes active.
-
Patent Agency Ranking
公开(公告)号：AU779767B2
公开(公告)日：2005-02-10
申请号：AU1677001
申请日：2001-02-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
Abstract: The defined boundaries in a network are pushed down to the base station level. Doing so necessitates authentication each time a wireless terminal switches communication, or "handoffs" from one base station to another. To achieve such authentication in an efficient manner, security information, i.e., the derived information, is transferred from one base station directly to another. By directly it is meant without accessing any other source of the derived information, although the information may be transferred via other intervening nodes of the network that form an interconnection path for the base stations. A simplified network, i.e., a network with reduced hierarchy from a control point of view, e.g., one that only requires home location register and base station network entities along with interconnection therefore, may be employed with a minimal decrease in performance, e.g., a minimal increase in delay, during the handoff process. In one embodiment of the invention, a first base station which initially receives a service request from a wireless terminal requests authentication information from a central security node and receives in response at least, one, but typically two or more, sets of security information. When it is time for a handoff from the first base station to a second base station, the first base station transmits to the second base station at least one of the sets of security information it received from the central security node. The second base station then uses the information it received from the first base station to authenticate the wireless terminal.
-
公开(公告)号：DE60100369T2
公开(公告)日：2004-04-22
申请号：DE60100369
申请日：2001-01-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
Abstract: The penalties associated with relying on layer-4 to handle packets lost as a result of a handoff can be reduced by forwarding, in response to a handoff request from a first base station to a second base station, at least one layer-2 frame of a layer-3 packet destined to/from the wireless terminal that has been passed down from layer-3 to layer-2, and so is indicated to have been transmitted at layer-3 even though not all of the layer-2 frames of the layer-3 packet have actually been transmitted. In one embodiment of the invention, each of the at least one layer-2 frames may be encapsulated together in a special layer-3 packet that is transferred from the first base to the second base station in the usual manner of inter-base-station communication. Advantageously, packets are not lost at layer-4 due to handoffs. Thus, layer-4 retransmissions are not required, and so delays in the network are reduced. Furthermore, if only the layer-2 frames that were not transmitted over the air to the wireless terminal by the first base station are transferred to the second base station, a savings may be had in use of the air interface.
-
公开(公告)号：DE60100369D1
公开(公告)日：2003-07-24
申请号：DE60100369
申请日：2001-01-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
Abstract: The penalties associated with relying on layer-4 to handle packets lost as a result of a handoff can be reduced by forwarding, in response to a handoff request from a first base station to a second base station, at least one layer-2 frame of a layer-3 packet destined to/from the wireless terminal that has been passed down from layer-3 to layer-2, and so is indicated to have been transmitted at layer-3 even though not all of the layer-2 frames of the layer-3 packet have actually been transmitted. In one embodiment of the invention, each of the at least one layer-2 frames may be encapsulated together in a special layer-3 packet that is transferred from the first base to the second base station in the usual manner of inter-base-station communication. Advantageously, packets are not lost at layer-4 due to handoffs. Thus, layer-4 retransmissions are not required, and so delays in the network are reduced. Furthermore, if only the layer-2 frames that were not transmitted over the air to the wireless terminal by the first base station are transferred to the second base station, a savings may be had in use of the air interface.
-
公开(公告)号：BR0100193A
公开(公告)日：2001-10-09
申请号：BR0100193
申请日：2001-01-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
Abstract: The defined boundaries in a network are pushed down to the base station level. Doing so necessitates authentication each time a wireless terminal switches communication, or "handoffs" from one base station to another. To achieve such authentication in an efficient manner, security information, i.e., the derived information, is transferred from one base station directly to another. By directly it is meant without accessing any other source of the derived information, although the information may be transferred via other intervening nodes of the network that form an interconnection path for the base stations. A simplified network, i.e., a network with reduced hierarchy from a control point of view, e.g., one that only requires home location register and base station network entities along with interconnection therefore, may be employed with a minimal decrease in performance, e.g., a minimal increase in delay, during the handoff process. In one embodiment of the invention, a first base station which initially receives a service request from a wireless terminal requests authentication information from a central security node and receives in response at least, one, but typically two or more, sets of security information. When it is time for a handoff from the first base station to a second base station, the first base station transmits to the second base station at least one of the sets of security information it received from the central security node. The second base station then uses the information it received from the first base station to authenticate the wireless terminal.
-
公开(公告)号：AU1676801A
公开(公告)日：2001-08-16
申请号：AU1676801
申请日：2001-02-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAVIES STEPHEN WILLIAM , VANDERVEEN MICHAELA C
Abstract: Paging areas aligned with wireless terminals are dynamically created. A first base station passes to the wireless terminal a list of all the base stations that it knows and are within a prescribed number of handoffs of the first base station. The wireless terminal uses this list to define its own "personal" paging area. Each time the wireless terminal emerges from a sleep state, it listens for the base station having the best signal and compares its identification against the list of base stations in its personal paging area. If the best signal base station is on the list, any paging messages for the wireless terminal are automatically broadcast by that base station. Otherwise, the wireless terminal must conduct a handoff to that base station to obtain a new personal paging area centered on that base station with that base station as paging agent. Messages originating elsewhere in the network are forwarded to the paging agent for delivery to the wireless terminal. The paging agent then instructs all known base stations within prescribed number of handoffs of it to page the wireless terminal. The wireless terminal, on hearing the page, will form a connection with the base station having the best signal for communicating. The base station having the best signal for communicating notifies the paging agent that it has established a connection with the wireless terminal, which leaves paging mode and becomes active.
-
-
-
-
-
-
-
-
-
Search Results
45
records
(took 0.027 seconds)
