Methods and apparatus for synchronizing critical data transmission
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsZhenhua Zou, Ali Behravan, Joachim Sachs
Life of this patent
Estimating the term…
Abstract
The present disclosure provides techniques for reducing latency of periodic URLLC transmission and other critical data transmission with low latency requirements. To support periodic URLLC traffic, SPS with repetition is used. Before synchronization is achieved, the base station (300, 500) sends to the UE (400, 600) an SPS configuration for a periodic uplink data transmissions. When the starting time of the data transmission is not known, the base station (300, 600) over-provisions SPS resources for the periodic data transmission. Based on the timing of the data transmissions, the base stations (300, 600) adjusts the timing of the SPS configuration.
Claims18
A method, implemented by base station in a wireless communication network, of synchronizing a periodic data transmission, each data transmission of the periodic data transmission comprising a predetermined number of repetitions, the method comprising:
- sending a first Semi-Persistent Scheduling (SPS) configuration to a user equipment for the periodic data transmission, the SPS configuration including a SPS period and an offset;
- allocating available SPS resources within the SPS period for the periodic data transmission, wherein a number of SPS resources allocated for the periodic data transmission exceeds the number of repetitions in each data transmission;
- receiving a data transmission from, or sending a data transmission to, the user equipment in a first SPS period;
- determining a new SPS configuration based on a timing of the data transmission to synchronize the SPS period with the periodic data transmission;
- and
- sending the new SPS configuration to the user equipment.
A method, implemented by a user equipment in a wireless communication network, of synchronizing a periodic downlink transmission between the user equipment and a base station, the method comprising:
- receiving, from the base station, a Semi-Persistent Scheduling (SPS) configuration for the periodic downlink transmission, the SPS configuration including an SPS period and an offset;
- receiving, from the base station, an allocation of available SPS resources in the SPS period for the periodic downlink transmission, wherein a number of SPS resources allocated for the periodic downlink transmission exceeds the number of repetitions in each downlink transmission;
- blindly detecting and receiving a downlink transmission from the base station on allocated SPS resources according to the SPS configuration;
- detecting a cyclic shift of a reference signal in the downlink transmission;
- and
- determining, based on the cyclic shift, if the downlink transmission comprises padding data or non-padding data.
A base station in a wireless communication network configured to synchronize a periodic data transmission, each data transmission of the periodic data transmission comprising a predetermined number of repetitions, the base station comprising:
- interface circuitry;
- and
- processing circuitry operatively connected to the interface circuitry and configured to:
- send a first Semi-Persistent Scheduling (SPS) configuration to a user equipment for the periodic data transmission, the SPS configuration including a SPS period and an offset;
- allocate available SPS resources within the SPS period for the periodic data transmission, wherein a number of SPS resources allocated for the periodic data transmission exceeds the number of repetitions;
- receive a data transmission from, or sending a data transmission to, the user equipment;
- determine a new SPS configuration based on a timing of the data transmission to synchronize the SPS period with the periodic data transmission;
- and
- send the new SPS configuration to the user equipment.
A user equipment in a wireless communication network configured to receive a periodic downlink transmission from a base station, the user equipment comprising:
- interface circuitry;
- and
- processing circuitry operatively connected to the interface circuitry and configured to:
- receive, from the base station, a Semi-Persistent Scheduling (SPS) configuration for the periodic downlink transmission, the SPS configuration including an SPS period and an offset;
- receive, from the base station, an allocation of available SPS resources in the SPS period for the periodic downlink transmission, wherein a number of SPS resources allocated for the periodic downlink transmission exceeds the number of repetitions in each downlink transmission;
- and
- blindly detect and receive a downlink transmission from the base station on allocated SPS resources according to the SPS configuration;
- detect a cyclic shift of a reference signal in the downlink transmission;
- and
- determine, based on the cyclic shift, if the downlink transmission comprises padding data or non-padding data.
Dependencies are inferred from the claim text.