Uplink signaling for cooperative multipoint communication
A method of operating a wireless communication system is disclosed (FIG. 6 ). The method includes receiving a virtual cell identification (VCID) parameter ( 600 ) from a remote transmitter. A base sequence index (BSI) and a cyclic shift hopping (CSH) parameter ( 604,606 ) are determined in response to the VCID. A pseudo-random sequence is selected in response to the BSI and CSH ( 610,612 ). A reference signal is generated using the selected pseudo-random sequence ( 614 ).
1. A method of operating a wireless communication apparatus, comprising:
receiving a signal from a base station;
selecting a cell-specific parameter in response to a first state of the signal, or a user-specific parameter in response to a second state of the signal, wherein the user-specific parameter is a virtual cell identification parameter;
initializing a first pseudo-random sequence generator for generating a base sequence with the virtual cell identification parameter;
initializing a second pseudo-random sequence generator for generating a cyclic shift hopping sequence with the virtual cell identification parameter;
generating an uplink reference signal in response to the selected parameter; and
transmitting the uplink reference signal generated from the base sequence and the cyclic shift hopping sequence.
2. A method of operating a wireless communication apparatus, comprising:
receiving a signal from a base station;
determining if a physical uplink control channel (PUCCH) or sounding reference signal (SRS) ID, n ID is present in the signal;
initializing a pseudo-random number generator for a base sequence group, sequence and cyclic shift hopping sequence with n ID when n ID is present in the signal;
initializing a pseudo-random number generator for a base sequence group, sequence and cyclic shift hopping sequence with a Physical Cell Identification (PCID) associated with the base station when n ID is not present in the signal;
selecting a cell-specific parameter in response to a first state of the signal or a user-specific parameter in response to a second state of the signal; and
generating an uplink reference signal in response to the selected parameter.
3. A method as in claim 2 , wherein said signal from a base station is a Radio Resource Control (RRC) signal.