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公开(公告)号：CA2223781C
公开(公告)日：2002-05-21
申请号：CA2223781
申请日：1995-06-14
Applicant: IBM
Inventor： SCHOTT WOLFGANG HANS , CHEVILLAT PIERRE RENE , RUPF MARCEL , CIDECIYAN ROY DARON
Abstract: The present system is split into a physical layer (20), a data link layer, and a network layer (24). The data link layer is further split into three parts, namely, data link con- trol (23), and two medium access control parts (DLC) (21 and 22). The DLC layer (23) is concerned with link establishment, release and maintenance. The lower MAC part (21) may exist in multiple instances, whereas the upper MAC part (22) is unique. Physically, the two MAC parts (21 and 22) are separated on the network side because the upper MAC part resides in a RNC while the lower part exists in each base sta- tion. The connectionless packet ser- vice (CLPS) entity (25.1) provides the packet radio service to the mobile user and the CLPS entity (25.2) on th e netowrk side provides all facilities required for registration and authentication of mobile users, assigning and administrating their VCIs, and interfacing to a packet data network. The CLPS entities (25.1 and 25.2) use the logical link administrators (LLA) (26.x) to initiall y route messages via a regular dedicated control channel (DCCH) (27.x) to their peer entities. After the MS is attached to the PRCH, all messages exchanged between the CLPS entities (25.x) as well as user data packets are always directed via the respective PRCH (28.x). In this cas e, the control packets and user data packets an passed through the DLC (29.x) to the packet radio (PR) control entity (30.x). The packets a re fragmented and protected with an error control code, e.g. a block code (BC), by a respective unit (31.x) for detecting transmission erro rs on the receiving side. Then they are convolutionally encoded, interleaved (IL) by the entity (32.x), and transmitted over the PDCH (33). O n the receiving side the fragments are reconstructed from the received samples reassembled to packets, and forwarded to the target CLPS entity (25.2). When the decoder (31.2) detects the receipt of an erroneous packet fragment, an automatic request for repetition (ARQ) sche me provided in the PR control requests its retransmission.
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Patent Agency Ranking
公开(公告)号：DE68915274D1
公开(公告)日：1994-06-16
申请号：DE68915274
申请日：1989-07-12
Applicant: IBM
Inventor： CHEVILLAT PIERRE RENE , ELEFTHERIOU EVANGELOS , MAIWALD DIETRICH G U , QUINTIN MICHEL
Abstract: In a data transmission wherein a transmitting modem transmits data signals to a receiving modem via a telephone line, the process of the invention consists in rotating (12), in the transmitting modem, the phase of the point of the constellation resulting from a group of data bits by a predetermined phase value, and then rotating (22) after, a predetermined delay in the receiving modem, the phase of the estimated point resulting from the transformation of the analog signal, by the opposite of said predetermined phase value, the mean-square error between the rotated point and the estimated point of the constellation being used to determine whether the receiving modem is out of synchronization or not.
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公开(公告)号：PL324002A1
公开(公告)日：1998-04-27
申请号：PL32400295
申请日：1995-06-14
Applicant: IBM
Inventor： CHEVILLAT PIERRE RENE , CIDECIYAN ROY DARON , RUPF MARCEL , SCHOTT WOLFGANG HANS
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公开(公告)号：ES2132669T3
公开(公告)日：1999-08-16
申请号：ES95920184
申请日：1995-06-14
Applicant: IBM
Inventor： CHEVILLAT PIERRE RENE , CIDECIYAN ROY DARON , RUPF MARCEL , SCHOTT WOLFGANG HANS
Abstract: A system and method for the wireless transmission of data packets in a code division multiple access communication system wherein one of the code division multiple access channels (PRCH) is used in a time-shared fashion for the transmission of the data packets from several transmitting stations (MSy, MSz) to a receiving station (BS).A request is sent from a transmitting station (MSy) to the corresponding receiving station (BS) of the communication system indicating the destination address to which data packet(s) are to be routed.Then, registering the transmitting station (MSy) and assigning an unique virtual connection identifier (VCIy) to it.Next, the transmitting station (MSy) is attached to the code division multiple access channel (PRCH) used for the transmission of data packets.Then, listening to the downlink of the code division multiple access channel (PRCH) used for the transmission of data packets until the corresponding receiving station (BS) broadcasts that it will be "idle" such that a random access to the code division multiple access channel (PRCH) used for the transmission of data packets is allowed in the next frame.Next, the transnmission power of the transmitting station (MSy) is ramped up during the next frame until a certain power level is reached.The data packet(s) and the virtual connection identifier (VCIy) are transmitted over the uplink of the code division multiple access channel (PRCH) used for the transmission of data packets to the receiving station (BS).The data packet(s) are routed to the destination address.Access to the code division multiple access channel (PRCH) used for the transmission of data packets is controller by a multiple access protocol based on carrier sensing and collision detection (CSMA/CD).
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公开(公告)号：CA2223781A1
公开(公告)日：1997-01-03
申请号：CA2223781
申请日：1995-06-14
Applicant: IBM
Inventor： CIDECIYAN ROY DARON , CHEVILLAT PIERRE RENE , SCHOTT WOLFGANG HANS , RUPF MARCEL
Abstract: The present system is split into a physical layer (20), a data link layer, and a network layer (24). The data link layer is further split into three parts, namely, data link control (23), and two medium access control parts (DLC) (21 and 22). The DLC layer (23) is concerned with link establishment, release and maintenance. The lower MAC part (21) may exist in multiple instances, whereas the upper MAC part (22) is unique. Physically, the two MAC parts (21 and 22) are separated on the network side because the upper MAC part resides in a RNC while the lower part exists in each base station. The connectionless packet service (CLPS) entity (25.1) provides the packet radio service to the mobile user and the CLPS entity (25.2) on the netowrk side provides all facilities required for registration and authentication of mobile users, assigning and administrating their VCIs, and interfacing to a packet data network. The CLPS entities (25.1 and 25.2) use the logical link administrators (LLA) (26.x) to initially route messages via a regular dedicated control channel (DCCH) (27.x) to their peer entities. After the MS is attached to the PRCH, all messages exchanged between the CLPS entities (25.x) as well as user data packets are always directed via the respective PRCH (28.x). In this case, the control packets and user data packets are passed through the DLC (29.x) to the packet radio (PR) control entity (30.x). The packets are fragmented and protected with an error control code, e.g. a block code (BC), by a respective unit (31.x) for detecting transmission errors on the receiving side. Then they are convolutionally encoded, interleaved (IL) by the entity (32.x), and transmitted over the PDCH (33). On the receiving side the fragments are reconstructed from the received samples, reassembled to packets, and forwarded to the target CLPS entity (25.2). When the decoder (31.2) detects the receipt of an erroneous packet fragment, an automatic request for repetition (ARQ) scheme provided in the PR control requests its retransmission.
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公开(公告)号：DE68915274T2
公开(公告)日：1994-11-10
申请号：DE68915274
申请日：1989-07-12
Applicant: IBM
Inventor： CHEVILLAT PIERRE RENE , ELEFTHERIOU EVANGELOS , MAIWALD DIETRICH G U , QUINTIN MICHEL
Abstract: In a data transmission wherein a transmitting modem transmits data signals to a receiving modem via a telephone line, the process of the invention consists in rotating (12), in the transmitting modem, the phase of the point of the constellation resulting from a group of data bits by a predetermined phase value, and then rotating (22) after, a predetermined delay in the receiving modem, the phase of the estimated point resulting from the transformation of the analog signal, by the opposite of said predetermined phase value, the mean-square error between the rotated point and the estimated point of the constellation being used to determine whether the receiving modem is out of synchronization or not.
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