US20030112759A1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Physical layer assisted retransmission
Assignee: Apple Inc
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Filing: 2001-12-13
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Granted: —
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Expires: 2021-12-13
Abstract
Abstract The present invention provides a fast and efficient retransmission technique, which allows a link control layer to request retransmission of frames upon receiving information from an underlying physical layer that an unsuccessful attempt to transmit data was detected. In general, a failed attempt to transmit a frame is detected at a physical layer of a receiver. In response, the physical layer of the receiver sends a message to a link control layer of the receiver to indicate the failed attempt to transmit a frame was detected. Upon receipt of the message, the link control layer sends a retransmission message to a corresponding link control layer of a sender. The retransmission message is configured to cause the sender to retransmit the unrecoverable data associated with the corrupted frame.
Inventors
- 👤 Hang Zhang
- 👤 Mo-Han Fong
- 👤 Mark Earnshaw
- 👤 Wei Huang
- 👤 Yoon Cheong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:19
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/1607; H04L1/1635; H04L1/0001; H04L1/18; H04L1/1867; H04L1/188
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
91 words
1 . A method for initiating retransmission of frames comprising: a) detecting a failed attempt to transmit a frame at a physical layer of a receiver; b) sending a message from the physical layer of the receiver to a link control layer of the receiver to indicate the failed attempt to transmit a frame has been detected; and c) upon receipt of the message, sending a retransmission message from the link control layer of the receiver, the retransmission message configured to cause a sender to retransmit data associated with the frame.
Claim 2
Dependent Claim
91 words
1 . A method for initiating retransmission of frames comprising: a) detecting a failed attempt to transmit a frame at a physical layer of a receiver; b) sending a message from the physical layer of the receiver to a link control layer of the receiver to indicate the failed attempt to transmit a frame has been detected; and c) upon receipt of the message, sending a retransmission message from the link control layer of the receiver, the retransmission message configured to cause a sender to retransmit data associated with the frame.
Claim 3
Dependent Claim
39 words
2 . The method of claim 1 wherein the detecting step further comprises receiving at least a portion of the frame and determining at least a portion of the data associated with the frame is either unrecoverable or corrupted.
Claim 4
Dependent Claim
26 words
3 . The method of claim 1 wherein the link control layer implements a Radio Link Protocol (RLP) using an RLP entity associated with an application.
Claim 5
Dependent Claim
64 words
4 . The method of claim 3 wherein the frame is a physical layer frame encapsulating data represented by an RLP frame and the sending step further comprises generating the retransmission message to include identification for one of the group consisting of a recently received RLP frame and recently received data such that the sender can identify data or an RLP frame to retransmit.
Claim 6
Dependent Claim
55 words
5 . The method of claim 1 wherein the frame is a physical layer frame, the method further comprising: a) receiving the retransmission message at a link control layer of the sender; b) determining data or a link control layer frame to retransmit; and c) retransmitting the data or link control layer frame requiring retransmission.
Claim 7
Dependent Claim
25 words
6 . The method of claim 1 wherein the message is a primitive indicative of a failed attempt to receive frames in the physical layer.
Claim 8
Dependent Claim
14 words
7 . The method of claim 1 wherein retransmission message is an acknowledgement message.
Claim 9
Dependent Claim
83 words
8 . The method of claim 1 further wherein the frame is a physical layer frame, the method further comprising: a) sending link control layer frames from the sender over a wireless communication channel to the receiver via physical layer frames from the sender; b) setting a timer upon transmitting each of the link control layer frames from the sender; and c) resetting the timer upon confirmation the link control layer frames were received or a subsequent link control layer frame is sent.
Claim 10
Dependent Claim
76 words
9 . The method of claim 8 wherein when a timer for one of the link control layer frames expires, sending one of the group consisting of a request message to the link control layer of the receiver from the sender requesting identification of a last portion of data or link control layer frame received by the link control layer of the receiver and data or a link control layer frame associated with the timer expiration.
Claim 11
Dependent Claim
96 words
10 . A communication system comprising a control system and a communication interface that cooperate to provide a physical layer and a link control layer adapted to: a) detect a failed attempt to transmit a frame at the physical layer; b) send a message from the physical layer to the link control layer to indicate that the failed attempt to transmit the frame has been detected; and c) upon receipt of the message, send a retransmission message from the link control layer to a sender to cause the sender to retransmit data associated with the frame.
Claim 12
Dependent Claim
96 words
10 . A communication system comprising a control system and a communication interface that cooperate to provide a physical layer and a link control layer adapted to: a) detect a failed attempt to transmit a frame at the physical layer; b) send a message from the physical layer to the link control layer to indicate that the failed attempt to transmit the frame has been detected; and c) upon receipt of the message, send a retransmission message from the link control layer to a sender to cause the sender to retransmit data associated with the frame.
Claim 13
Dependent Claim
38 words
11 . The communication system of claim 10 wherein the physical layer receives at least a portion of the frame and determines at least a portion of the data associated with the frame is either unrecoverable or corrupted.
Claim 14
Dependent Claim
27 words
12 . The communication system of claim 10 wherein the link control layer implements a Radio Link Protocol (RLP) using an RLP entity associated with an application.
Claim 15
Dependent Claim
64 words
13 . The communication system of claim 12 wherein the frame is a physical layer frame encapsulating data represented by an RLP frame and the link control layer generates the retransmission message to include identification for one of the group consisting of a recently received RLP frame and recently received data such that the sender can identify data or an RLP frame to retransmit.
Claim 16
Dependent Claim
78 words
14 . The communication system of claim 10 wherein the frame is a physical layer frame and further comprising a sender control system and a communication interface cooperating to provide a physical layer and a link control layer for the sender to: a) receive the retransmission message at a link control layer of the sender; b) determine data or a link control layer frame to retransmit; and c) retransmit the data or link control layer frame requiring retransmission.
Claim 17
Dependent Claim
26 words
15 . The communication system of claim 10 wherein the message is a primitive indicative of a failed attempt to receive frames in the physical layer.
Claim 18
Dependent Claim
15 words
16 . The communication system of claim 10 wherein retransmission message is an acknowledgement message.
Claim 19
Dependent Claim
103 words
17 . The communication system of claim 10 wherein the frame is a physical layer frame and further comprising a sender control system and a communication interface cooperating to provide a physical layer and a link control layer for the sender to: a) send link control layer frames over a wireless communication channel to the receiver via physical layer frames from the sender; b) set a timer upon transmitting each of the link control layer frames from the sender; and c) reset the timer upon confirmation that the link control layer frames were received or a subsequent link control layer frame is sent.
Claim 20
Dependent Claim
80 words
18 . The communication system of claim 17 wherein when the timer for one of the link control layer frames expires, the link control layer of the sender sends one of the group consisting of a request message to the link control layer of the receiver requesting identification of a last portion of data or control layer frame received by the link control layer of the receiver and data or a link control layer frame associated with the timer expiration.
Claim 21
Dependent Claim
93 words
19 . A computer readable medium comprising software to provide instructions to allow a physical layer and a link control layer to cooperate to: a) detect a failed attempt to transmit a frame at the physical layer; b) send a message from the physical layer to the link control layer to indicate that the failed attempt to transmit a frame has been detected; and c) upon receipt of the message, send a retransmission message from the link control layer to a sender to cause the sender to retransmit data associated with the frame.
Claim 22
Dependent Claim
93 words
19 . A computer readable medium comprising software to provide instructions to allow a physical layer and a link control layer to cooperate to: a) detect a failed attempt to transmit a frame at the physical layer; b) send a message from the physical layer to the link control layer to indicate that the failed attempt to transmit a frame has been detected; and c) upon receipt of the message, send a retransmission message from the link control layer to a sender to cause the sender to retransmit data associated with the frame.
Claim 23
Dependent Claim
40 words
20 . The computer readable medium of claim 19 wherein the physical layer receives at least a portion of the frame and determines that at least a portion of the data associated with the frame is either unrecoverable or corrupted.
Claim 24
Dependent Claim
28 words
21 . The computer readable medium of claim 19 wherein the link control layer implements a Radio Link Protocol (RLP) using an RLP entity associated with an application.
Claim 25
Dependent Claim
65 words
22 . The computer readable medium of claim 21 wherein the frame is a physical layer frame encapsulating data represented by an RLP frame and the link control layer generates the retransmission message to include identification for one of the group consisting of a recently received RLP frame and recently received data such that the sender can identify data or an RLP frame to retransmit.
Claim 26
Dependent Claim
79 words
23 . The computer readable medium of claim 19 wherein the frame is a physical layer frame and further comprising a sender control system and a communication interface cooperating to provide a physical layer and a link control layer for the sender to: a) receive the retransmission message at a link control layer of the sender; b) determine data or a link control layer frame to retransmit; and c) retransmit the data or link control layer frame requiring retransmission.
Claim 27
Dependent Claim
27 words
24 . The computer readable medium of claim 19 wherein the message is a primitive indicative of a failed attempt to receive frames in the physical layer.
Claim 28
Dependent Claim
16 words
25 . The computer readable medium of claim 19 wherein retransmission message is an acknowledgement message.
Claim 29
Dependent Claim
104 words
26 . The computer readable medium of claim 19 wherein the frame is a physical layer frame and further comprising a sender control system and a communication interface cooperating to provide a physical layer and a link control layer for the sender to: a) send link control layer frames over a wireless communication channel to the receiver via physical layer frames from the sender; b) set a timer upon transmitting each of the link control layer frames from the sender; and c) reset the timer upon confirmation that the link control layer frames were received or a subsequent link control layer frame is sent.
Claim 30
Dependent Claim
81 words
27 . The computer readable medium of claim 26 wherein when a timer for one of the link control layer frames expires, the link control layer of the sender sends one of the group consisting of a request message to the link control layer of the receiver requesting identification of a last portion of data or control layer frame received by the link control layer of the receiver and data or a link control layer frame associated with the timer expiration.
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