New sequences have been proposed and/or adopted for short Physical Uplink Control Channel communications between base stations and UEs. In an exemplary embodiment, a UE communicates with a base station based on sequence groups that include the new sequences, where the new sequences are allocated to different sequence groups based, at least in part, on correlations with other existing sequences included in individual sequence groups.

Techniques discussed herein can facilitate reduced density CSI (Channel State Information)-RS (Reference Signals). One example embodiment can be employed at a UE (User Equipment) and can comprise processing circuitry configured to receive and process a configuration message that comprises one or more configuration parameters for one or more CSI (Channel State Information)-RS (Reference Signal) APs (Antenna Ports) of a configurable density CSI-RS. The configuration parameters indicate a density of CSI-RS resource per Physical Resource Block (PRB) per CSI-RS AP and a PRB offset. The processing circuitry is further configured to determine a set of REs (Resource Elements) for the one or more CSI-RS APs of the configurable density CSI-RS based on the one or more configuration parameters and perform measurements on the configurable density CSI-RS from the set of REs to determine one or more CSI parameters. The one or more configuration parameters are provided per CSI-RS resource configuration.

Techniques discussed herein can facilitate reduced density CSI (Channel State Information)-RS (Reference Signals). One example embodiment can be employed at a UE (User Equipment) and can comprise processing circuitry configured to receive and process a configuration message that comprises one or more configuration parameters for one or more CSI (Channel State Information)-RS (Reference Signal) APs (Antenna Ports) of a configurable density CSI-RS. The configuration parameters indicate a density of CSI-RS resource per Physical Resource Block (PRB) per CSI-RS AP and a PRB offset. The processing circuitry is further configured to determine a set of REs (Resource Elements) for the one or more CSI-RS APs of the configurable density CSI-RS based on the one or more configuration parameters and perform measurements on the configurable density CSI-RS from the set of REs to determine one or more CSI parameters. The one or more configuration parameters are provided per CSI-RS resource configuration.

A terminal according to one aspect of the present disclosure includes: a control section that assumes that a frequency domain orthogonal cover code (FD-OCC) having a sequence length of a number larger than two is applied to a demodulation reference signal mapped to a pair of resource elements the number of which is greater than two and that are being different in frequency; and a transmitting/receiving section that performs transmission processing or reception processing of the demodulation reference signal, based on the FD-OCC. According to one aspect of the present disclosure, even when there are terminals according to different releases, each of the terminals can appropriately perform communication.

A terminal according to one aspect of the present disclosure includes: a receiving section that receives a signal over a plurality of resources; and a control section that multiplies the signal thus received, by a value in an orthogonal cover code (OCC) for each resource in the plurality of resources, and measures a channel state information (CSI)—reference signal (RS) obtained by adding results of the multiplication. The resource is a period longer than a resource block or a symbol. According to one aspect of the present disclosure, a CSI-RS transmitted by using a larger number of CSI-RS ports can be appropriately measured.

New sequences have been proposed and/or adopted for short Physical Uplink Control Channel communications between base stations and UEs. In an exemplary embodiment, a UE communicates with a base station based on sequence groups that include the new sequences, where the new sequences are allocated to different sequence groups based, at least in part, on correlations with other existing sequences included in individual sequence groups.

According to aspects of the disclosure, there is provided a method for a UE to select or be assigned or configured with a spreading sequence that is based on one or more communication parameters such as receiver type, receiver capability, SE, TBS, MCS, traffic load, PAPR requirement, MCL, number of layers, overloading, reliability requirement, transmission power consumption, number of active UEs, and transmission latency constraint, etc. In some embodiments, the spreading sequence may be related to a performance metric associated with an above parameter (PAPR, BLER, etc.). In some embodiments, this is achieved by associating spreading sequences with parameters or performance metrics, or both. In some instances the spreading sequences may be arranged or ordered in a manner to reduce signaling overhead (e.g., signaling an index is more efficient than signaling a value of a metric, and ordering correlates the index to the value).

A method, base station (BS), user equipment (UE), apparatus, and computer program product for wireless communication are provided. An aggressor BS may cause a remote interference condition for a victim BS, and the victim BS may transmit a reference signal to the aggressor BS to enable a remote interference management (RIM) operation to be performed. However, the aggressor BS may be unable to identify the victim BS based at least in part on the reference signal, and may fail to transmit a reference signal as a response. Further, when the aggressor BS does transmit a reference signal, the victim BS may be unable to identify the aggressor BS. This may reduce an effectiveness of RIM operations. In some aspects, BSs may transmit reciprocal reference signals including identification information to enable effective RIM operations.

A method, base station (BS), user equipment (UE), apparatus, and computer program product for wireless communication are provided. An aggressor BS may cause a remote interference condition for a victim BS, and the victim BS may transmit a reference signal to the aggressor BS to enable a remote interference management (RIM) operation to be performed. However, the aggressor BS may be unable to identify the victim BS based at least in part on the reference signal, and may fail to transmit a reference signal as a response. Further, when the aggressor BS does transmit a reference signal, the victim BS may be unable to identify the aggressor BS. This may reduce an effectiveness of RIM operations. In some aspects, BSs may transmit reciprocal reference signals including identification information to enable effective RIM operations.

A physical uplink control channel transmission method, a terminal, and a network-side device are provided. The method includes: determining a target cyclic shift parameter corresponding to each symbol according to an initial cyclic shift parameter and a random value associated with at least an index of the symbol; sending a physical uplink control channel according to the target cyclic shift parameter.