Forward link based rescue channel method and apparatus for telecommunication systems
First Claim
1. In a communications network having a plurality of sectors and a mobile station (MS), the MS including a MS active set, a method for continuing a connection between at least one of the plurality of sectors and the MS, comprising:
- detecting an acknowledgement failure at the MS;
autonomously adding one or more pilots to the MS active set at the MS by itself when the MS detects the acknowledgement failure, each pilot corresponding to one of the plurality of sectors;
transmitting over one or more assumed code channels (ACCs) for use in a rescue from at least one of the plurality of sectors;
at the MS, searching for one or more ACCs from the sectors corresponding to the pilots in the MS active set;
at the MS, discovering one or more ACCs are receivable from at least one of the plurality of sectors; and
continuing the connection at the MS when the one or more receivable ACCs are discovered.
1 Assignment
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Accused Products
Abstract
A forward rescue procedure (FRP) for preventing loss of signal and dropped connections between a mobile station and the infrastructure in a wireless telecommunications network is disclosed. The FRP allows wireless systems to recover from forward link failures at the mobile station that would otherwise result in dropped connections. Examples of failure scenarios that can be overcome using the FRP include forward link Layer 2 acknowledgement failures and loss of forward link signal due to a fade that causes loss of signal for a period of time exceeding a threshold value. In response to a potential connection drop situation, a mobile station will autonomously add base station pilot channels to the active set of its rake receiver in order to rescue the connection in danger of dropping. Concurrently, the wireless network infrastructure will initiate transmission on alternative forward link channels that are likely to be monitored by the mobile station during an FRP. If the same channels are monitored by the MS and transmitted on by the infrastructure, the connection in danger of dropping can be rescued.
61 Citations
74 Claims
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1. In a communications network having a plurality of sectors and a mobile station (MS), the MS including a MS active set, a method for continuing a connection between at least one of the plurality of sectors and the MS, comprising:
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detecting an acknowledgement failure at the MS;
autonomously adding one or more pilots to the MS active set at the MS by itself when the MS detects the acknowledgement failure, each pilot corresponding to one of the plurality of sectors;
transmitting over one or more assumed code channels (ACCs) for use in a rescue from at least one of the plurality of sectors;
at the MS, searching for one or more ACCs from the sectors corresponding to the pilots in the MS active set;
at the MS, discovering one or more ACCs are receivable from at least one of the plurality of sectors; and
continuing the connection at the MS when the one or more receivable ACCs are discovered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 57, 58, 59, 60)
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24. In a communications network having a plurality of sectors and one or more mobile stations (MSs), a method for continuing a connection between at least one of the plurality of sectors and the MSs, comprising:
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detecting a potentially failing connection at the MS;
autonomously and dynamically changing one or more pilots in the MS active set at the MS during a rescue when the MS detects the potentially failing connection, each pilot corresponding to one of the plurality of sectors;
transmitting at least one rescue channel from at least one of the plurality of sectors;
monitoring one or more of the plurality of sectors for the rescue channel corresponding to the pilots in the MS active set at the MS;
at the MS, discovering one or more rescue channels are receivable; and
continuing the connection when the one or more receivable rescue channels are discovered.
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25. A method of operating a mobile station (MS) to continue a connection between the MS and a communications network having a plurality of sectors, the MS having a MS active set, the network capable of transmitting over one or more assumed code channels (ACCs) from at least one of the plurality of sectors, the method comprising:
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detecting an acknowledgement failure;
autonomously adding one or more pilots to the MS active set when the MS detects the acknowledgement failure, each pilot corresponding to one of the plurality of sectors;
searching for one or more ACCs from the sectors corresponding to the pilots in the MS active set;
discovering one or more ACCs are receivable from at least one of the plurality of sectors; and
continuing the connection when the one or more receivable ACCs are discovered. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 61, 62)
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37. A communications system, comprising:
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a network having a network processor and a plurality of sectors for transmitting and receiving signals; and
a mobile station (MS) having a MS processor and a MS active set for receiving a signal from one or more of the plurality of sectors, the MS processor programmed for detecting an acknowledgement failure;
wherein the network processor is further programmed for transmitting over one or more assumed code channels (ACCs) for use in a rescue from at least one of the plurality of sectors; and
wherein the MS processor is further programmed for autonomously adding one or more pilots to the MS active set by itself, each pilot corresponding to one of the plurality of sectors, searching for one or more ACCs from the sectors corresponding to the pilots in the MS active set, discovering one or more ACCs are receivable from at least one of the plurality of sectors, and continuing the connection when the one or more receivable ACCs are discovered, if the MS processor detects the acknowledgement failure. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 63, 64, 73)
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46. A communications system, comprising:
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a network having a network processor and a plurality of sectors for transmitting and receiving signals; and
a mobile station (MS) having a MS processor and a MS active set for receiving signals from one or more of the plurality of sectors, the MS processor programmed for detecting a potentially failing connection with the one or more sectors in the network;
wherein the network processor is further programmed for transmitting over at least one rescue channel from at least one of the plurality of sectors; and
wherein the MS processor is further programmed for autonomously and dynamically changing one or more pilots corresponding to one or more respective rescue channels in the MS active set by itself during a rescue, monitoring one or more of the plurality of sectors for the rescue channel, discovering one or more rescue channels are receivable, and continuing the connection when the one or more receivable rescue channels are discovered, if the MS processor detects the potentially failing connection. - View Dependent Claims (65)
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47. A communications system, comprising:
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a network having a network processor and a plurality of sectors for transmitting and receiving signals; and
a mobile station (MS) having a MS processor and an MS active set for receiving signals from one or more of the plurality of sectors, the MS processor programmed for detecting an Acknowledgement Failure;
wherein the MS processor is further programmed for autonomously adding a pilot corresponding to a rescue channel to the MS active set by itself, and transmitting over the rescue channel if the MS processor detects the acknowledgement failure; and
wherein the network processor is further programmed for monitoring the MS for the rescue channel, discovering one or more rescue channels are receivable, and continuing the connection when the one or more receivable rescue channels are discovered. - View Dependent Claims (66, 67, 68)
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48. A mobile station (MS) for communicating with a network, the network having a plurality of sectors capable of transmitting one or more assumed code channels (ACCs) for use in a rescue, the MS comprising:
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a MS active set; and
a MS processor programmed for detecting an acknowledgement failure, autonomously adding one or more pilots to the MS active set by itself when the acknowledgement failure is detected, each pilot corresponding to one of the plurality of sectors, searching for one or more ACCs from the sectors corresponding to the pilots in the MS active set, discovering one or more ACCs receivable from at least one of the plurality of sectors, and continuing the connection when the one or more receivable ACCs are discovered. - View Dependent Claims (49, 50, 51, 52, 69, 70, 74)
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53. A mobile station (MS) for communicating with a communications network having a plurality of sectors capable of receiving a rescue channel, the MS comprising:
a MS processor programmed for detecting an Acknowledgement Failures autonomously adding one or more pilots to a MS active set by itself when the acknowledgement failure is detected, each pilot corresponding to one of the plurality of sectors, and transmitting over the rescue channel to one or more of the plurality of sectors.
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54. A communications system, comprising:
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first means having a plurality of sectors for transmitting and receiving signals; and
second means having a MS active set for receiving signals from one or more of the plurality of sectors, and for detecting an acknowledgement failure;
wherein the first means includes means for transmitting over one or more assumed code channels (ACCs) for use in a rescue from at least one of the plurality of sectors; and
wherein the second means includes means for autonomously adding one or more pilots to the MS active set by itself when the second means detects the acknowledgement failure, each pilot corresponding to one of the plurality of sectors, means for searching for one or more ACCs from the sectors corresponding to the pilots in the MS active set, means for discovering one or more ACCs are receivable from at least one of the plurality of sectors, and means for continuing the connection when the one or more receivable ACCs are discovered. - View Dependent Claims (55)
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56. A mobile station (MS) for communicating with a network, the network having a plurality of sectors capable of transmitting one or more assumed code channels (ACCs) for use in a rescue, the MS comprising:
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a MS active set;
means for detecting an acknowledgement failure;
means for autonomously adding one or more pilots to the MS active set by itself if the acknowledgement failure is detected, each pilot corresponding to one of the plurality of sectors;
means for searching for one or more ACCs from the sectors corresponding to the pilots in the MS active set;
means for discovering one or more ACCs receivable from at least one of the plurality of sectors; and
means for continuing the connection when the one or more receivable ACCs are discovered.
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71. A method of operating a mobile station (MS) to continue a connection between the MS and a communications network having a plurality of sectors, the MS having a MS active set, the network capable of transmitting over one or more assumed code channels (ACCs) from at least one of the plurality of sectors, the method comprising:
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detecting a potentially failing connection;
autonomously and dynamically changing one or more pilots in the MS active set during a rescue after the MS detects the potentially failing connection, each pilot corresponding to one of the plurality of sectors;
searching for one or more ACCs from the sectors corresponding to the pilots in the MS active set;
discovering one or more ACCs are receivable from at least one of the plurality of sectors; and
continuing the connection when the one or more receivable ACCs are discovered.
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72. A mobile station (MS) for communicating with a network, the network having a plurality of sectors capable of transmitting one or more assumed code channels (ACCs) for use in a rescue, the MS comprising:
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a MS active set; and
a MS processor programmed for detecting a potentially failing connection, autonomously and dynamically changing one or more pilots in the MS active set by itself during the rescue when the potentially failing connection is detected, each pilot corresponding to one of the plurality of sectors, searching for one or more ACCs from the sectors corresponding to the pilots in the MS active set, discovering one or more ACCs receivable from at least one of the plurality of sectors, and continuing the connection when the one or more receivable ACCs are discovered.
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Specification