US 10,433,321 B2 · Method and arrangement in a telecommunication system

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.

Claims16

Dependent claims

A method for processing scheduling information in a cellular communication system, the method comprising:

receiving, at a user equipment (UE), a scheduling message indicating an allocation of transmission resources for a downlink transmission associated with a first Hybrid Automatic Repeat reQuest (HARQ) process of the UE;
determining whether a new data indicator (NDI) flag in the scheduling message has been toggled, wherein determining whether the NDI flag has been toggled comprises considering the NDI flag to have been toggled regardless of a value of the NDI flag if the scheduling message is addressed to an identifier that is associated with dynamic scheduling for the UE and a most recent previous transmission for the first HARQ process occurred on a semi-persistent scheduled resource;
storing the value of the NDI flag;
and
receiving either a new data transmission or a retransmission for the first HARQ process in accordance with the determination of whether the NDI flag has been toggled.

2 more elements

A method for processing scheduling information in a cellular communication system, the method comprising:

receiving, at a user equipment (UE), scheduling messages for dynamically-scheduled downlink transmissions associated with a first Hybrid Automatic Repeat reQuest (HARQ) process of the UE, wherein each of the scheduling messages includes a new data indicator (NDI) flag;
when a most recent previous transmission for the first HARQ process occurred on a dynamically-scheduled resource, determining whether scheduling messages received for the first HARQ process relate to a new transmission or a re-transmission based on whether a respective value of the NDI flag for that scheduling message has been toggled;
when the most recent previous transmission for the first HARQ process occurred on a semi-persistent scheduling (SPS) resource, determining whether scheduling messages received for the first HARQ process relate to a new transmission or a re-transmission regardless of the value of the NDI flag for that scheduling message;
storing the value of the NDI flag;
and
receiving either a new transmission or a re-transmission in accordance with each scheduling message.

3 more elements

An apparatus for processing scheduling information in a cellular communication system, the method comprising:

a receiver, at a user equipment (UE), receiving a scheduling message indicating an allocation of transmission resources for a downlink transmission associated with a first Hybrid Automatic Repeat reQuest (HARQ) process of the UE;
a processor determining whether a new data indicator (NDI) flag in the scheduling message has been toggled, wherein determining whether the NDI flag has been toggled comprises considering the NDI flag to have been toggled regardless of a value of the NDI flag if the scheduling message is addressed to an identifier that is associated with dynamic scheduling for the UE and a most recent previous transmission for the first HARQ process occurred on a semi-persistent scheduled resource;
and
a memory storing the value of the NDI flag, wherein
either a new data transmission or a retransmission is received for the first HARQ process in accordance with the determination of whether the NDI flag has been toggled.