Hybrid dedicated reference signal method and system
The transmission and decoding of resource blocks (RBs) transmitted via a multiple-input multiple-output (MIMO) antenna having a plurality of transmit antennas is disclosed. Each RB includes a plurality of resource elements (REs). Each RE is reserved for one of a common reference signal (CRS) associated with one of the transmit antennas, a dedicated reference signal (DRS) including a single beamformed or precoded pilot, a DRS including a composite beamformed or precoded pilot, and a data symbol. Each RB may include a “control type” data symbol that indicates a DRS mode associated with the RB. In one DRS mode, each DRS includes a single beamformed or precoded pilot. In another DRS mode, each DRS includes a composite beamformed or precoded pilot. In yet another DRS mode, single beamformed or precoded pilots, and composite beamformed or precoded pilots, may coexist and be transmitted simultaneously within the same RBs or in different RBs.
1. A wireless communication method of transmitting resource blocks (RBs), the method comprising:
generating multiple RBs, wherein:
each RB of the multiple RBs comprises multiple resource elements (REs);
the REs comprise at least one dedicated reference signal (DRS) specific to a single wireless transmit/receive unit (WTRU) and at least one control-type data symbol;
the at least one control-type data symbol comprises a DRS mode indicator signaling any of multiple DRS modes;
in a first DRS mode of the multiple DRS modes, a first configuration of the REs is used for the at least one DRS and the at least one DRS comprises a respective at least one single beamformed or precoded pilot; and
in a second DRS mode of the multiple DRS modes, a second configuration of the REs is used for the at least one DRS and the at least one DRS comprises a respective at least one composite beamformed or precoded pilot; and
transmitting the RBs via a multiple-input multiple-output (MIMO) antenna.
2. The method of claim 1 , wherein each DRS mode of the multiple DRS modes is indicative of a number of transmission layers.
3. The method of claim 1 , wherein one or more RBs of the multiple RBs comprises the at least one control-type data symbol that includes the DRS mode indicator.
4. The method of claim 1 , wherein in a third DRS mode of the multiple DRS modes:
a third configuration of the REs is used for the at least one DRS;
the at least one DRS of a first RB of the multiple RBs includes a respective at least one single beamformed or precoded pilot; and
the at least one DRS of a second RB of the multiple RBs include a respective at least one composite beamformed or precoded pilot.
5. The method of claim 1 , wherein in a third DRS mode of the multiple DRS modes:
a third configuration of the REs is used for the at least one DRS;
the at least one DRS of a first RB of the multiple RBs includes a respective at least one single beamformed or precoded pilot;
the at least one DRS of a second RB of the multiple RBs includes a respective at least one composite beamformed or precoded pilot; and
the REs of a third RB of the multiple RBs lack DRSs.
6. The method of claim 1 , wherein in a third DRS mode of the multiple DRS modes:
a third configuration of the REs is used for the at least one DRS;
a first group of the REs is reserved for the at least one DRS formed as a single beamformed or precoded pilot; and
a second group of the REs is reserved for the at least one DRS formed as a composite beamformed or precoded pilot.
7. The method of claim 1 , wherein in a third DRS mode of the multiple DRS modes:
a third configuration of the REs is used for the at least one DRS; and
the at least one DRS comprises a respective at least one combination of a single beamformed or precoded pilot and a composite beamformed or precoded pilot.
8. The method of claim 1 , wherein in a third DRS mode of the multiple DRS modes:
the at least one DRS is multiple DRSs; and
the DRSs comprise at least one single beamformed or precoded pilot and at least one composite beamformed or precoded pilot.
9. The method of claim 1 , wherein the DRS mode indicator indicates a change in DRS mode.
10. A base station comprising:
a multiple-input multiple-output (MIMO) antenna;
a processor for generating multiple resource blocks (RBs), wherein:
each RB of the multiple RBs comprises multiple resource elements (REs);
the REs comprise at least one dedicated reference signal (DRS) specific to a single wireless transmit/receive unit (WTRU) and at least one control-type data symbol;
the at least one control-type data symbol comprises a DRS mode indicator signaling any of multiple DRS modes;
in a first DRS mode of the multiple DRS modes, a first configuration of REs is used for the at least one DRS and the at least one DRS comprises a respective at least one single beamformed or precoded pilot; and
in a second DRS mode of the multiple DRS modes, a second configuration of the REs is used for the at least one DRS and the at least one DRS comprises a respective at least one composite beamformed or precoded pilot; and
a transmitter for transmitting the generated RBs via the MIMO antenna.
11. The base station of claim 10 , wherein each DRS mode of the multiple DRS modes is indicative of a number of transmission layers.
12. The base station of claim 10 , wherein one or more RBs of the multiple RBs comprises the at least one control-type data symbol that includes the DRS mode indicator.
13. The base station of claim 10 , wherein in a third DRS mode of the multiple DRS modes:
a third configuration of the REs used for the at least one DRS;
the at least one DRS of a first RB of the multiple RBs includes a respective at least one single beamformed or precoded pilot; and
the at least one DRS of a second RB of the multiple RBs includes a respective at least one composite beamformed or precoded pilot.
14. The WTRU of claim 10 , wherein in a third DRS mode of the multiple DRS modes:
a third configuration of the REs is used for the at least one DRS;
the least one DRS of a first RB of the multiple RBs includes a respective single beamformed or precoded pilot;
the at least one DRS of a second RB of the multiple RBs includes a respective at least one composite beamformed or precoded pilot; and
the REs of a third RB of the multiple RBs lack DRSs.
15. The base station of claim 10 , wherein in a third DRS mode of the multiple DRS modes:
a third configuration of the REs is used for the at least one DRS;
a first group of the REs is reserved for the at least one DRS formed as a single beamformed or precoded pilot; and
a second group of the REs is reserved for the at least one DRS formed as a composite beamformed or precoded pilot.
16. The base station of claim 10 , wherein in a third DRS mode of the multiple DRS modes:
a third configuration of the REs is used for multiple DRSs; and
the DRSs comprise a respective at least one combination of a single beamformed or precoded pilot and a composite beamformed or precoded pilot.
17. The base station of claim 10 , wherein in a third DRS mode of the multiple DRS modes:
the at least one DRS is multiple DRSs; and
the DRSs comprise at least one single beamformed or precoded pilot and at least one composite beamformed or precoded pilot.
18. The base station of claim 10 , wherein the DRS mode indicator indicates a change in DRS mode.
19. A base station comprising: a processor, transmitter and a multiple-input multiple output (MIMO) antenna, wherein:
the transmitter is configured to transmit multiple resource blocks (RBs) via the MIMO antenna;
each RB of the multiple RBs comprises multiple resource elements (REs);
the REs comprise at least one dedicated reference signal (DRS) specific to a single wireless transmit/receive unit (WTRU) and at least one control-type data symbol;
the at least one control-type data symbol comprises a DRS mode indicator signaling any of a plurality of DRS modes;
in a first DRS mode of the multiple DRS modes, a first configuration of REs is used for the at least one DRS and the at least one DRS comprises a respective at least one single beamformed or precoded pilot; and
in a second DRS mode of the multiple DRS modes, a second configuration of the REs is used for the at least one DRS and the at least one DRS comprises a respective at least one composite beamformed or precoded pilot.
20. The base station of claim 19 , wherein one or more RBs of the multiple RBs comprise the at least one control-type data symbol that includes the DRS mode indicator.
21. The method of claim 1 , wherein the REs comprise a common reference signal (CRS) for a plurality of WTRUs.
22. The method of claim 1 , wherein the REs comprise a data symbol.
23. The base station of claim 10 , wherein the REs comprise a common reference signal (CRS) for a plurality of WTRUs.
24. The base station of claim 10 , wherein the REs comprise a data symbol.
25. The base station of claim 19 , wherein the REs comprise a common reference signal (CRS) for a plurality of WTRUs.
26. The base station of claim 19 , wherein the REs comprise a data symbol.