EP0594458A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Inter-cellular interference detection by cancelling data corruption events reported by mobile stations
Assignee: NEC Corp
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Filing: 1993-10-22
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Granted: —
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Expires: 2013-10-22
Abstract
Abstract Within a cell of a TDMA mobile communication system, each mobile station transmits a control message on an up-link frame. On receiving it, the base station determines if the message quality is affected during transmission. A corruption status indication is stored into a position of a frame status memory corresponding to the up-link frame if the message quality is low. When the base station detects a frame identification contained in the received message, it erases the corruption status indication stored in a position identified by the detected frame identification, and transmits a control message on a down-link frame, containing the result of the quality determination. In response, the mobile station stores the identification of the frame of the message into a collision memory, and retransmits a copy of the up-link control message containing the frame identification.
Inventors
- 👤 Masashi c/o NEC Comm. Systems Ltd. Fujita
- 👤 Toshitaro c/o NEC Comm. Systems Ltd. Harada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 03:12
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/0001; H04L1/0023; H04L1/0026; H04L1/12; H04L1/16; H04L1/18; H04L1/1867; H04L1/1874; H04W; H04W72/00; H04W72/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
319 words
A communication system having a base station and a plurality of mobile stations, said base station and said mobile stations establishing up-link frames for transmission of signals from the mobile stations to the base station and down-link frames for transmission of signals from the base station to the mobile stations, said base station comprising: means for receiving an up-link control message one of said up-link frames; a frame status memory; means for determining whetherthe quality of the received up-link control message is affected during transmission, and storing a corruption status indication into a position of said frame status memory corresponding to said one up-link frame if said quality is determined to be affected; means for detecting a frame identification from the received up-link control message and erasing a corruption status indication stored in a position of the frame status memory corresponding to the detected frame identification; and means for transmitting a down-link control message on one of a plurality of down-link frames, the transmitted down-link control message indicating whether the quality of the received up-link control message is determined as being affected; each of said mobile stations comprising: means for transmitting an up-link control message on one of said up-link frames when said one up-link frame is available for all the mobile stations; means for receiving said down-link control message; means for causing said transmitting means to retransmit a copy of the transmitted up-link control message if the received down-link control message indicates that the quality of the up-link control message is determined as being affected during transmission; a collision memory; and means, responsive to the received down-link control message indicating that the quality of the up-link control message is determined as being affected, for storing the frame identification of said up-link frame into said collision memory and causing said transmitting means to retransmit a copy of the transmitted up-link control containing a copy of the stored frame identification.
Claim 2
Dependent Claim
319 words
A communication system having a base station and a plurality of mobile stations, said base station and said mobile stations establishing up-link frames for transmission of signals from the mobile stations to the base station and down-link frames for transmission of signals from the base station to the mobile stations, said base station comprising: means for receiving an up-link control message one of said up-link frames; a frame status memory; means for determining whetherthe quality of the received up-link control message is affected during transmission, and storing a corruption status indication into a position of said frame status memory corresponding to said one up-link frame if said quality is determined to be affected; means for detecting a frame identification from the received up-link control message and erasing a corruption status indication stored in a position of the frame status memory corresponding to the detected frame identification; and means for transmitting a down-link control message on one of a plurality of down-link frames, the transmitted down-link control message indicating whether the quality of the received up-link control message is determined as being affected; each of said mobile stations comprising: means for transmitting an up-link control message on one of said up-link frames when said one up-link frame is available for all the mobile stations; means for receiving said down-link control message; means for causing said transmitting means to retransmit a copy of the transmitted up-link control message if the received down-link control message indicates that the quality of the up-link control message is determined as being affected during transmission; a collision memory; and means, responsive to the received down-link control message indicating that the quality of the up-link control message is determined as being affected, for storing the frame identification of said up-link frame into said collision memory and causing said transmitting means to retransmit a copy of the transmitted up-link control containing a copy of the stored frame identification.
Claim 3
Dependent Claim
49 words
A communication system as claimed in claim 1, wherein said base station is connected to a switched telephone network and includes means for counting the corruption status indications stored in said frame status memory at periodic intervals to produce an interference count, and reporting the count to said network.
Claim 4
Dependent Claim
316 words
In a communication system having a base station and a plurality of mobile stations, said base station and said mobile stations establishing up-link frames for transmission of signals from the mobile stations to the base station and down-link frames for transmission of signals from the base station to the mobile stations, said base station including a frame status memory and each of said mobile station including a collision memory, a method comprising: a) transmitting from a mobile station an up-link control message on one of said up-linkframes when said one up-iink frame is available for all the mobile stations; b) receiving, at said base station, said up-link control message and determining whether the quality of the received up-link control message is affected or unaffected during transmission; c) storing a corruption status indication into a position of said frame status memory corresponding to said one up-linkframe if said quality is determined to be affected; d) detecting a frame identification from the received up-link control message and erasing a corruption status indication stored in a position of said frame status memory identified by the detected frame identification; e) transmitting from said base station a down-link control message on one of plurality of down-link frames, the transmitted down-link control message indicating whether the quality of the received up-link control message is determined by the step (b) as being affected during transmission; f) receiving said down-link control message at said mobile station; and g) if the received down-link control message indicates that the quality of the up-link control message is determined as being affected, storing the frame identification of said up-link frame into said collision memory, retransmitting a copy of the transmitted up-link control message containing a copy of the stored frame identification, and repeating the steps (f) and (g) until the received down-link control message indicates that the quality of the up-link control message is determined as being unaffected.
Claim 5
Dependent Claim
316 words
In a communication system having a base station and a plurality of mobile stations, said base station and said mobile stations establishing up-link frames for transmission of signals from the mobile stations to the base station and down-link frames for transmission of signals from the base station to the mobile stations, said base station including a frame status memory and each of said mobile station including a collision memory, a method comprising: a) transmitting from a mobile station an up-link control message on one of said up-linkframes when said one up-iink frame is available for all the mobile stations; b) receiving, at said base station, said up-link control message and determining whether the quality of the received up-link control message is affected or unaffected during transmission; c) storing a corruption status indication into a position of said frame status memory corresponding to said one up-linkframe if said quality is determined to be affected; d) detecting a frame identification from the received up-link control message and erasing a corruption status indication stored in a position of said frame status memory identified by the detected frame identification; e) transmitting from said base station a down-link control message on one of plurality of down-link frames, the transmitted down-link control message indicating whether the quality of the received up-link control message is determined by the step (b) as being affected during transmission; f) receiving said down-link control message at said mobile station; and g) if the received down-link control message indicates that the quality of the up-link control message is determined as being affected, storing the frame identification of said up-link frame into said collision memory, retransmitting a copy of the transmitted up-link control message containing a copy of the stored frame identification, and repeating the steps (f) and (g) until the received down-link control message indicates that the quality of the up-link control message is determined as being unaffected.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 3, further comprising counting the corruption status indications stored in said frame status memory at periodic intervals to produce an interference count.
References Cited (Backward Citations)
No citation records indexed.
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