The spatial properties of the link between the TP and the device is such that it fits well with the other TPs in the CoMP set. In some embodiments, the rank or condition number of the joint channel matrix between all or a subset of the TPs in the CoMP set is high. In other embodiments, the spatial correlation is low between the channels of the different TPs in the CoMP set and the device. A high rank or condition number may be favorable for multiple input multiple output (MIMO) communication. Low spatial correlation may be favorable for diversity, which may improve reliability. Note that high rank and low spatial correlation is fundamentally related.
In some embodiments, a TP performs random access signal detection on random access resources that a device would be allowed to select for certain services and/or performance requirements, if the TP supports such services and/or performance requirements. In some embodiments, a TP performs random access signal detection on random access resources that a device would use to request certain system information, if the TP is capable and/or assigned to provide such system information in the downlink.