Method and arrangement in a telecommunication system
First Claim
1. A method in a user equipment, UE, in connection with a base station in a cellular communication system, for avoiding errors in a Hybrid Automatic Repeat reQuest (HARQ) process, wherein a plurality of scheduling modes are supported including a dynamic scheduling mode in which the UE receives scheduling messages from the base station indicating which resources have been allocated for uplink and downlink transmission, and a semi-persistent scheduling (SPS) mode in which new transmissions are performed on pre-assigned resources, and wherein a New Data Indicator (NDI) flag included in a scheduling message for SPS mode is interpreted as indicating either SPS activation or SPS retransmissions, and an NDI flag included in a scheduling message for dynamic scheduling mode is interpreted as indicating, by toggling of the flag, a new transmission in dynamic scheduling mode, the method comprising:
- receiving, in a scheduling message, an indication that dynamically scheduled transmission will take place for a first HARQ process; and
if a previous transmission that occurred for the first HARQ process before the indication was received used a semi persistent resource, then considering the NDI flag to be toggled regardless of the value of the NDI flag, whereby the received indication is interpreted as an indication of a new transmission.
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Accused Products
Abstract
The present invention relates to a method in a cellular communication system, for avoiding errors in a HARQ process, wherein an NDI flag is used both for indicating either semi-persistent scheduling, SPS activation or SPS retransmissions, and also for indicating, by toggling of the flag, a new transmission in dynamic scheduling mode. The method comprises the steps of receiving, in a scheduling message, an indication that dynamically scheduled transmission will take place; if a semi persistent resource has occurred for the same HARQ process since a previously received indication for dynamically scheduled transmission, then considering the NDI flag to be toggled regardless of the value of the NDI flag. Thus, if the condition is fulfilled, a UE will always regard the NDI flag as indicating or requesting a new data transmission.
13 Citations
18 Claims
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1. A method in a user equipment, UE, in connection with a base station in a cellular communication system, for avoiding errors in a Hybrid Automatic Repeat reQuest (HARQ) process, wherein a plurality of scheduling modes are supported including a dynamic scheduling mode in which the UE receives scheduling messages from the base station indicating which resources have been allocated for uplink and downlink transmission, and a semi-persistent scheduling (SPS) mode in which new transmissions are performed on pre-assigned resources, and wherein a New Data Indicator (NDI) flag included in a scheduling message for SPS mode is interpreted as indicating either SPS activation or SPS retransmissions, and an NDI flag included in a scheduling message for dynamic scheduling mode is interpreted as indicating, by toggling of the flag, a new transmission in dynamic scheduling mode, the method comprising:
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receiving, in a scheduling message, an indication that dynamically scheduled transmission will take place for a first HARQ process; and if a previous transmission that occurred for the first HARQ process before the indication was received used a semi persistent resource, then considering the NDI flag to be toggled regardless of the value of the NDI flag, whereby the received indication is interpreted as an indication of a new transmission. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A User Equipment (UE) connectable to a base station in a cellular communication system, said UE being configured to avoid errors in a Hybrid Automatic Repeat reQuest (HARQ) process, wherein the UE supports a plurality of scheduling modes including a dynamic scheduling mode in which the UE receives scheduling messages from the base station indicating which resources have been allocated for uplink and downlink transmission, and a semi-persistent scheduling (SPS) mode wherein new transmissions are performed on pre-assigned resources, and wherein a New Data Indicator (NDI) flag included in a scheduling message for SPS mode is interpreted as indicating either SPS activation or SPS retransmissions, and an NDI flag included in a scheduling message for dynamic scheduling mode is interpreted as indicating, by toggling of the flag, a new transmission in dynamic scheduling mode, the UE comprising:
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a transceiver unit configured to receive, in a scheduling message, an indication that dynamically scheduled transmission will take place for a first HARQ process; and a processing unit configured to check if a previous transmission that occurred for the first HARQ process before the indication was received used a semi-persistent resource and to consider the NDI flag to be toggled regardless of the value of the NDI flag if said condition is fulfilled, whereby the received indication is interpreted as an indication of a new transmission. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method in a base station in connection with a user equipment (UE) in a cellular communication system, for avoiding errors in a Hybrid Automatic Repeat reQuest (HARQ) process, wherein a plurality of scheduling modes are supported including a dynamic scheduling mode in which the UE receives scheduling messages from the base station indicating which resources have been allocated for uplink and downlink transmission, and a semi-persistent scheduling (SPS) mode in which new transmissions are performed on pre-assigned resources, and wherein a New Data Indicator (NDI) flag included in a scheduling message for SPS mode is interpreted as indicating either SPS activation or SPS retransmissions and an NDI flag included in a scheduling message for dynamic scheduling mode is interpreted as indicating, by toggling of the flag, a new transmission in dynamic scheduling mode, the method comprising:
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indicating, in a scheduling message to the UE that dynamically scheduled transmission will take place for a first HARQ process; and if a previous transmission that occurred for the first HARQ process before the indication was sent used a semi persistent resource, then setting an NDI flag in the scheduling message to any value and adopting this value as status for the HARQ process in question, whereby the sent indication indicates to the UE that a transmission corresponding to the sent indication will be a new transmission. - View Dependent Claims (14, 15)
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16. A base station connectable with a user equipment (UE) in a cellular communication system, configured to avoid errors in a Hybrid Automatic Repeat reQuest (HARQ) process, wherein the base station supports a plurality of scheduling modes including a dynamic scheduling mode in which the base station transmits scheduling messages to the UE indicating which resources have been allocated for uplink and downlink transmission, and a semi-persistent scheduling (SPS) mode in which new transmissions are performed on pre-assigned resources, the base station being configured to use a New Data Indicator (NDI) flag included in a scheduling message for SPS mode to indicate either SPS activation or SPS retransmissions, and an NDI flag included in a scheduling message for dynamic scheduling mode to indicate, by toggling of the flag, a new transmission in dynamic scheduling mode, said base station comprising:
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a scheduling unit configured to schedule a dynamic transmission; a transceiver unit configured to transmit in a scheduling message to said UE, an indication that dynamically scheduled transmission will take place for a first HARQ process; and a processing unit configured to check if a previous transmission that occurred for the first HARQ process before the indication was sent used a semi persistent resource and to set an NDI flag in the scheduling message to any value and adopt this value as status for the HARQ process in question if said condition is fulfilled, whereby the transmitted indication indicates to the UE that a transmission corresponding to the sent indication will be a new transmission. - View Dependent Claims (17, 18)
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Specification