Method and apparatus for detecting and recovering from errors occurring in a transmission of digital information

Claim 3

The method of claim 1, wherein a set including said first pieces of information and said second pieces of information has a cardinal number, and said size value represents said cardinal number.

Claim 4

The method of claim 2, further comprising the step of retransmitting at least a portion of said amount of said digital information when said size value exceeds said count of said first pieces of information.

Claim 5

The method of claim 3, further comprising the step of determining whether said size value exceeds said count of said first pieces of information by a predetermined value when said size value does not equal said count of said first pieces of information.

Claim 6

The method of claim 4, wherein said step of retransmitting includes: retransmitting an entirety of said amount of said digital information when said size value exceeds said count of said first pieces of information by at least said predetermined value; and retransmitting information corresponding to said second pieces of information when said size value does not exceed said count of said first pieces of information by at least said predetermined value.

Claim 7

The method of claim 5, wherein each one of said first pieces of information and said second pieces of information includes a sequence number, each said sequence number indicating a respective position of a corresponding one of said first pieces of information and said second pieces of information in said amount of said digital information, and further comprising the steps of: initializing a signal check table at a storage location in communication with said receiving unit and said signal check table having a table position corresponding to each said sequence number; marking one said table position corresponding to one said sequence number when each one of said first pieces of information is received to indicate that a corresponding one of said first pieces of information was received; and determining said count of said first pieces of information by checking said signal check table after all of said amount of said digital information has been transmitted.

Claim 8

The method of claim 6, wherein said predetermined value is not greater than 200.

Claim 9

The method of claim 2, wherein each one of said first pieces of information and said second pieces of information includes a sequence number, each said sequence number indicating a respective position of a corresponding one of said first pieces of information and said second pieces of information in said amount of said digital information, and further comprising the steps of: initializing a signal check table at a storage location in communication with said receiving unit and said signal check table having a table position corresponding to each said sequence number; marking one said table position corresponding to one said sequence number when each one of said first pieces of information is received to indicate that a corresponding one of said first pieces of information was received; and determining said count of said first pieces of information by checking said signal check table after all of said amount of said digital information has been transmitted.

Claim 10

The method of claim 2, further comprising an error determining step of determining whether at least one of said first pieces of information contains error.

Claim 11

The method of claim 9, wherein: said header information includes a total checksum corresponding to said set, each one of said first pieces of information and said second pieces of information includes a correspond piece checksum, and said error determining step includes: computing a computed checksum by summing each said piece checksum included in said first pieces of information, comparing said computed checksum with said total checksum, and indicating that at least one of said first pieces of information contains error when said computed checksum does not equal said total checksum.

Claim 12

The method of claim 10, further comprising the step of retransmitting an entirety of said amount of said digital information when said error determining step indicates that at least one of said first pieces of information contains error.

Claim 13

The method of claim 9, further comprising the step of retransmitting an entirety of said amount of said digital information when said error determining step indicates that at least one of said first pieces of information contains error.

Claim 14

The method of claim 3, wherein each one of said first pieces of information and said second pieces of information includes a sequence number, each said sequence number indicating a respective position of a corresponding one of said first pieces of information and said second pieces of information in said amount of said digital information, and further comprising the steps of: initializing a signal check table at a storage location in communication with said receiving unit and said signal check table having a table position corresponding to each said sequence number; marking one said table position corresponding to one said sequence number when each one of said first pieces of information is received to indicate that a corresponding one of said first pieces of information was received; and determining said count of said first pieces of information by checking said signal check table after all of said amount of said digital information has been transmitted.

Claim 15

The method of claim 3, further comprising an error determining step of determining whether at least one of said first pieces of information contains error.

Claim 16

The method of claim 14, wherein: said header information includes a total checksum corresponding to said set, each one of said first pieces of information and said second pieces of information includes a corresponding piece checksum, and said error determining step includes: computing a computed checksum by summing each said piece checksum included in said first pieces of information, comparing said computed checksum with said total checksum, and indicating that at least one of said first pieces of information contains error when said computed checksum does not equal said total checksum.

Claim 17

The method of claim 15, further comprising the step of retransmitting an entirety of said amount of said digital information when said error determining step indicates that at least one of said first pieces of information contains error.

Claim 18

The method of claim 14, further comprising the step of retransmitting an entirety of said amount of said digital information when said error determining step indicates that at least one of said first pieces of information contains error.

Claim 19

The method of claim 4, wherein each one of said first pieces of information and said second pieces of information includes a sequence number, each said sequence number indicating a respective position of a corresponding one of said first pieces of information and said second pieces of information in said amount of a digital information, and further comprising the steps of: initializing a signal check table at a storage location in communication with said receiving unit and said signal check table having a table position corresponding to each said sequence number; marking o said table position corresponding to one said sequence number when each one of said first pieces of information is received to indicate that a corresponding one of said first pieces of information was received; and determining said count of said first pieces of information by checking said signal check table after all of said amount of said digital information has been transmitted.

Claim 20

The method of claim 18, wherein said predetermined value is not greater than 200.

Claim 21

The method of claim 18, wherein said predetermined value is p such that 25≦p≦75.

Claim 22

The method of claim 4, wherein said predetermined value is not greater than 200.

Claim 23

The method of claim 4, wherein said predetermined value is p such that 25≦p≦75.

Claim 24

The method of claim 5, wherein said predetermined value is not greater than 200.

Claim 25

The method of claim 5, wherein said predetermined value is p such that 25≦p≦75.

Claim 26

The method of claim 5, further comprising an error determining step of determining whether at least one of said first pieces of information contains error.

Claim 27

The method of claim 25, wherein: said header information includes a total checksum corresponding to said set, each one of said first pieces of information and said second pieces of information includes a corresponding piece checksum, and said error determining step includes: computing a computed checksum by summing each said piece checksum included in said first pieces of information, comparing said computed checksum with said total checksum, and indicating that at least one of said first pieces of information contains error when said computed checksum does not equal said total checksum.

Claim 28

The method of claim 26, further comprising the step of retransmitting said entirety of said amount of said digital information when said error determining step indicates that at least one of said first pieces of information contains error.

Claim 29

The method of claim 25, further comprising the step of retransmitting said entirety of said amount of said digital information when said error determining step indicates that at least one of said first pieces of information contains error.

Claim 30

The method of claim 6, wherein said predetermined value is p such that 25≦p≦75.

Claim 31

The method of claim 6, further comprising an error determining step of determining whether at least one of said first pieces of information contains error.

Claim 32

The method of claim 30, wherein; said header information includes a total checksum corresponding to said set, each one of said first pieces of information and said second pieces of information includes a corresponding piece checksum, and said error determining step includes; computing a computed checksum by summing each said piece checksum included in said first pieces of information, comparing said computed checksum with said total checksum, and indicating that at least one of said first pieces of information contains error when said computed checksum does not equal said total checksum.

Claim 33

The method of claim 31, further comprising the step of retransmitting said entirety of said amount of said digital information when said error determining step indicates that at least one of said first pieces of information contains error.

Claim 34

The method of claim 30, further comprising the step of retransmitting said entirety of said amount of said digital information when said error determining step indicates that at least one of said first pieces of information contains error.

Claim 35

The method of claim 1, further comprising the step of retransmitting at least a portion of said amount of said digital information when said size value does not correspond to said measure of said first quantity of information of said digital information.

Claim 36

The method of claim 1, further comprising the step of retransmitting at least a portion of said amount of said digital information when said size value does not correspond to said count of said first pieces of information.

Claim 37

The method of claim 1, further comprising an error determining step of determining whether at least one of said first pieces of information contains error.

Claim 38

The method of claim 36, further comprising the step of retransmitting an entirety of said amount of said digital information when said error determining step indicates that at least one of said first pieces of information contains error.

Claim 39

An information transmitting device, comprising: a receiving unit including an information receiver for receiving header information from a sending unit during an early stage of a transmission for digital information, said header information including a first physical quantity representing an amount of said digital information to be transmitted from said sending unit to said receiving unit, with said header information indicating a size value representing a size of said amount of said digital information; an accumulator for accumulating first signals representative of a measure of a first quantity of information of said digital information received during a later stage of said transmission, wherein said first quantity of information of said digital information includes first pieces of information, and said measure of said first quantity of information of said digital information is a count of said first pieces of information; a detector for detecting losses in said digital information in said later stage of said transmission by comparing said size value to said measure of said first quantity of information of said digital information; and an indicator for indicating that a second quantity of information of said digital information was lost during said later stage of said transmission whenever said size value does not correspond to said measure of said first quantity of information of said digital information, wherein said second quantity of information of said digital information corresponds to second pieces of information included in said amount of said digital information, and said size value corresponds to said count of said first pieces of information when said size value equals said count of said first pieces of information.

Claim 40

An information transmitting device, comprising: a receiving unit including an information receiver for receiving header information from a sending unit during an early stage of a transmission for digital information, said header information including a first physical quantity representing an amount of said digital information to be transmitted from said sending unit to said receiving unit, with said header information indicating a size value representing a size of said amount of said digital information; an accumulator for accumulating first signals representative of a measure of a first quantity of information of said digital information received during a later stage of said transmission, wherein said first quantity of information of said digital information includes first pieces of information, and said measure of said first quantity of information of said digital information is a count of said first pieces of information; a detector for detecting losses in said digital information in said later stage of said transmission by comparing said size value to said measure of said first quantity of information of said digital information; and an indicator for indicating that a second quantity of information of said digital information was lost during said later stage of said transmission whenever said size value does not correspond to said measure of said first quantity of information of said digital information, wherein said second quantity of information of said digital information corresponds to second pieces of information included in said amount of said digital information, and said size value corresponds to said count of said first pieces of information when said size value equals said count of said first pieces of information.

Claim 41

The information transmitting device of claim 38, further comprising: a retransmitter for retransmitting a second physical quantity representing at least a portion of said amount of said digital information when said size value does not correspond to said measure of said first quantity of information of said digital information.

Claim 42

The information transmitting device of claim 39, wherein: a set including said first pieces of information and said second pieces of information has a cardinal number, and said size value represents said cardinal number.

Claim 43

The information transmitting device of claim 40, further comprising: a discriminator, coupled to said retransmitter, for receiving said size value and said count of said first pieces of information and for generating second signals indicating whether said size value exceeds said count of said first pieces of information by at least a predetermined value; and wherein said retransmitter retransmits said second physical quantity in response to said second signals, and wherein said second physical quantity represents an entirety of said amount of said digital information when said second signals indicate that said size value exceeds said count of said first pieces of information by at least said predetermined value, and wherein said second physical quantity represents information corresponding to said second pieces of information when said second signals indicate that said size value does not exceed said count of said first pieces of information by at least said predetermined value.

Claim 44

The information transmitting device of claim 41, wherein each one of said first pieces of information and said second pieces of information includes a sequence number, each said sequence number indicating a respective position of a corresponding one of said first pieces of information and said second pieces of information in said amount of said digital information, and further comprising: a storage element, in communication with said receiving unit, for storing a signal check table having a table position corresponding to each said sequence number; a marker for storing a marker character in one said table position corresponding to one said sequence number when each one of said first pieces of information is received, whereby said signal check table indicates that a corresponding one of said first pieces of information was received; and a reader for determining said count of said first pieces of information by reading said signal check table after all of said amount of said digital information has been transmitted and for accumulating digits to indicate said count of said first pieces of information.

Claim 47

The method of claim 43, further comprising the steps of: determining, in accordance with an outcome of said step of comparing, whether at least one missed piece of said digital information was not received from said transmission for said digital information during loading of said digital information; and retransmitting at least a portion of said digital information when a loss occurred during loading of said digital information.

Claim 48

The method of claim 44, wherein said step of retransmitting includes: determining whether a cardinal number of a set including said at least one missed piece of said digital information exceeds at least a predetermined value, retransmitting an entirety of said digital information when said cardinal number exceeds said predetermined value, and retransmitting information corresponding to said at least one missed piece of said digital information when said cardinal number does not exceed said predetermined value.

Claim 51

The method of claim 46, further comprising the step of retransmitting an entirey of said information when said computed checksum does not equal said total checksum.

Claim 54

The method of claim 48, wherein said step of retransmitting when said received packet count does not equal said sent packet count includes; retransmitting said entirety of said plurality of packets when said sent packet count exceeds said received packet count by at least a predetermined value, and retransmitting each packet of said plurality of packets not received by said lower processor when said sent packet count does not exceed said received packet count by at least said predetermined value.