Automatic repetition request mechanism in a radio access network
First Claim
1. A method of handling the transmission of Radio Link Control (RLC) Protocol Data Units (PDUs) from a Radio Access Network (RAN) of a mobile telecommunications system to User Equipment (UE), the method comprising:
- at a Gateway (GW) of the UTRAN, segmenting RLC Service Data Units (SDUs) into RLC PDUs for transmission to at least one Base Station (BS) of a set of BSs belonging to a handover link set, and combining RLC PDUs received from the at least one BSs into RLC SDUs for transmission to a core network of the system; and
at each of the at least one BS, buffering RLC PDUs received from at least one of the GW and the UE, and implementing an Automatic Repetition Request (ARQ) mechanism at each of the at least one BS to facilitate reliable transmission of RLC PDUs between the UE and the GW, the ARC) mechanism utilizing ARQ status messages sent over the air interface, between the UE and the BS(s), in order to acknowledge successfully transmitted data packets and request retransmission of unsuccessfully transmitted data packets.
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Accused Products
Abstract
A method of handling the transmission of Radio Link Control (RLC) Protocol Data Units (PDUs) from a Radio Access Network (RAN) of a mobile telecommunications system to User Equipment (UE). At a Gateway of the RAN, RLC Service Data Units (SDUs) are segmented into RLC PDUs for transmission to one or more Base Stations (BSs) of a set of BSs belonging to a handover link set. RLC PDUs received from one or more of those BSs are combined into RLC SDUs for transmission to a core network of the system. Each of the BSs buffers the RLC PDUs received from the Gateway and/or the UE. An Automatic Repetition Request (ARQ) mechanism is implemented at each of the BSs to facilitate reliable transmission of RLC PDUs between the UE and the Gateway.
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Citations
12 Claims
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1. A method of handling the transmission of Radio Link Control (RLC) Protocol Data Units (PDUs) from a Radio Access Network (RAN) of a mobile telecommunications system to User Equipment (UE), the method comprising:
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at a Gateway (GW) of the UTRAN, segmenting RLC Service Data Units (SDUs) into RLC PDUs for transmission to at least one Base Station (BS) of a set of BSs belonging to a handover link set, and combining RLC PDUs received from the at least one BSs into RLC SDUs for transmission to a core network of the system; and
at each of the at least one BS, buffering RLC PDUs received from at least one of the GW and the UE, and implementing an Automatic Repetition Request (ARQ) mechanism at each of the at least one BS to facilitate reliable transmission of RLC PDUs between the UE and the GW, the ARC) mechanism utilizing ARQ status messages sent over the air interface, between the UE and the BS(s), in order to acknowledge successfully transmitted data packets and request retransmission of unsuccessfully transmitted data packets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mobile telecommunications system comprising a Universal Mobile Telephone System UMTS Terrestrial Radio Access Network (UTRAN) and, located in the UTRAN:
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a Gateway (GW) arranged to segment Radio Link Control (RLC) Service Data Units (SDUs) into RLC Protocol Data Units (PDUs) for transmission to at least one or more Base Station (BS) of a set of BSs belonging to a handover link set, and to combine RLC PDUs received from at least one of the BSs into RLC SDUs for transmission to a core network of the system; and
a plurality of Base Stations (BSs) arranged to form a soft handover link set for a given User Equipment (UE), each said BS being arranged to buffer RLC PDUs received from at least one of the GW and the UE and to implement an Automatic Repetition Request (ARQ) mechanism at each of the at least one BS to facilitate reliable transmission of RLC PDUs between the UE and the GW, the ARQ mechanism utilizing ARQ status messages sent over the air interface, between the UE and the BS(s), in order to acknowledge successfully transmitted data packets and request retransmission of unsuccessfully transmitted data packets.
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12. A Gateway for use in a Universal Mobile Telephone System (UMTS) Terrestrial Radio Access Network (UTRAN) in a mobile telecommunications system, comprising:
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means for segmenting Radio Link Control (RLC) Service Data Units (SDUs) into RLC Protocol Data Units (PDUs) for transmission to at least one Base Station (BS) of a set of BSs belonging to a handover link set, and means for combining RLC PDUs received from at least one of the BSs into RLC SDUs for transmission to a core network of the system.
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Specification