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US 2021/0282046 A1Published application
Antenna Port Mapping for Demodulation Reference Signals
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsYang Hu, David Astely, David Hammarwall, George Jöngren, Xinghua Song, Jianfeng Wang
Life of this patent
Estimating the term…
Abstract
A unified, rank independent mapping between antenna ports and group/code pairs. Each antenna port is uniquely associated with one code division multiplexing (CDM) group and one orthogonal cover code (OCC). The mapping between antenna ports and group/code pairs is chosen such that, for a given antenna port, the CDM group and OCC will be the same for every transmission rank.
Claims16
A method, implemented by a base station, for transmitting demodulation reference signals to a user terminal, the method comprising:
- determining a selected transmission rank from a plurality of transmission ranks for a downlink transmission to the user terminal;
- determining or more antenna ports for the downlink transmission based on a predetermined mapping between a set of antenna ports and a set of group and code pairs, wherein each group and code pair comprises a code division multiplexing group and orthogonal cover code;
- wherein the mapping between antenna ports in the set of antenna ports and the group and code pairs in the set of group and code pairs is such each antenna port in the set of antenna ports is associated a same group and code pair in the set of group and code pairs regardless of selected transmission rank;
- and
- transmitting the demodulation reference signals over the antenna ports corresponding to the selected transmission rank.
2 more elements
A method, implemented by a user terminal, for receiving demodulation reference signals transmitted by a base station, the method comprising:
- determining a selected transmission rank from a plurality of transmission ranks for a downlink transmission to the user terminal;
- determining or more antenna ports for the downlink transmission based on a predetermined mapping between a set of antenna ports and a set of group and code pairs, wherein each group and code pair comprises a code division multiplexing group and orthogonal cover code;
- wherein the mapping between antenna ports in the set of antenna ports and the group and code pairs in the set of group and code pairs is such each antenna port in the set of antenna ports is associated a same group and code pair in the set of group and code pairs regardless of selected transmission rank;
- and
- receiving the demodulation reference signals over the antenna ports corresponding to the selected transmission rank.
2 more elements
A base station, comprising:
- a plurality of transmit antennas;
- a transmitter operatively connected to the transmit antennas, the transmitter including a transmit signal processor and transmit controller;
- the transmitter configured to:
- determine a selected transmission rank from a plurality of transmission ranks for a downlink transmission to a user terminal;
- determine or more antenna ports for the downlink transmission based on a predetermined mapping between a set of antenna ports and a set of group and code pairs, wherein each group and code pair comprises a code division multiplexing group and orthogonal cover code;
- wherein the mapping between antenna ports in the set of antenna ports and the group and code pairs in the set of group and code pairs is such each antenna port in the set of antenna ports is associated a same group and code pair in the set of group and code pairs regardless of selected transmission rank;
- and
- transmit demodulation reference signals over the antenna ports corresponding to the selected transmission rank.
5 more elements
A user terminal, comprising:
- a plurality of receive antennas;
- a receiver operatively connected to the receive antennas, the receiver including a receive signal processor and receive controller;
- wherein the receiver is configured to:
- determine a selected transmission rank from a plurality of transmission ranks for a downlink transmission to a user terminal;
- determine or more antenna ports for the downlink transmission based on a predetermined mapping between a set of antenna ports and a set of group and code pairs, wherein each group and code pair comprises a code division multiplexing group and orthogonal cover code;
- wherein the mapping between antenna ports in the set of antenna ports and the group and code pairs in the set of group and code pairs is such each antenna port in the set of antenna ports is associated a same group and code pair in the set of group and code pairs regardless of selected transmission rank;
- and
- receive demodulation reference signals over the antenna ports corresponding to the selected transmission rank.
5 more elements
Dependencies are inferred from the claim text.