Abstract
A method for transmitting control information in a telecommunications cell is provided. The method includes a transmission point in the cell transmitting a unicast PDCCH intended only for a specific UE in the cell. The unicast PDCCH contains at least one resource element in each resource element group. The at least one resource element contains a UE-specific DMRS that can be used for decoding the unicast PDCCH without the cell-specific reference signal.
Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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4G | 16/03/2020 | ISLD-202003-023 | BLACKBERRY LTD |
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Claim
1. A method for transmitting control information in a telecommunications cell, comprising:
a subset of transmission points of a set of transmission points associated with an eNodeB (eNB) in the cell transmitting a unicast physical downlink control channel (PDCCH) intended only for a specific user equipment (UE) in the cell,
wherein the unicast PDCCH contains at least one resource element in each resource element group, and
wherein at least one resource element contains a UE-specific demodulation reference signal (DMRS) that can be used for decoding the unicast PDCCH, and
wherein the decoding occurs without the use of a cell-specific reference signal broadcast by the eNB, and
wherein a remainder of the set of transmission points does not transmit the unicast PDCCH.
2. The method of claim 1, wherein the at least one resource element is not allocated for the cell-specific reference signal being broadcast in the cell.
3. The method of claim 1, wherein the UE-specific DMRS is a sequence of symbols carrying a bit sequence that allows the specific UE to decode the unicast PDCCH correctly.
4. The method of claim 1, wherein the UE-specific DMRS is derived from at least one of:
a radio network temporary identifier assigned to the specific UE;
an identifier for the cell; and
a subframe index.
5. The method of claim 1, wherein a beam forming type of precoded transmission is used for the unicast PDCCH, and wherein the PDCCH is weighted and transmitted from a plurality of antenna ports such that signals from the plurality of antenna ports are coherently combined at the specific UE.
6. The method of claim 5, wherein a precoding vector for the precoded transmission is obtained from at least one of:
feedback from the specific UE regarding at least one downlink wideband channel;
and an uplink channel measurement based on channel reciprocity.
7. The method of claim 6, wherein a set of precoding vectors is predefined, and wherein each resource element group of the unicast PDCCH is precoded with one of the precoding vectors.
8. The method of claim 7, wherein a mapping from precoding vector to resource element group is performed in a cyclic manner.
9. A transmission point (TP) in a telecommunications cell, comprising:
a processor configured such that a subset of transmission points of a set of transmission points associated with an eNodeB (eNB) transmits a unicast physical downlink control channel (PDCCH) intended only for a specific user equipment (UE) in the cell,
wherein the unicast PDCCH contains at least one resource element in each resource element group, and
wherein at least one resource element containing a UE-specific demodulation reference signal (DMRS) that can be used for decoding the unicast PDCCH, and
wherein the decoding occurs without the use of a cell-specific reference signal broadcast by the eNB, and
wherein a remainder of the set of transmission points does not transmit the unicast PDCCH.
10. The TP of claim 9, wherein the at least one resource element is not allocated for the cell-specific reference signal being broadcast in the cell.
11. The TP of claim 9, wherein the UE-specific DMRS is a sequence of symbols carrying a bit sequence that allows the specific UE to decode the unicast PDCCH correctly.
12. The TP of claim 9, wherein the UE-specific DMRS is derived from at least one of:
a radio network temporary identifier assigned to the specific UE;
an identifier for the cell; and
a subframe index.
13. The TP of claim 9, wherein a beamforming type of precoded transmission is used for the unicast PDCCH, and wherein the PDCCH is weighted and transmitted from a plurality of antenna ports such that signals from the plurality of antenna ports are coherently combined at the specific UE.
14. The TP of claim 13, wherein a precoding vector for the precoded transmission is obtained from at least one of:
feedback from the specific UE regarding at least one downlink wideband channel;
and an uplink channel measurement based on channel reciprocity.
15. The TP of claim 14, wherein a set of precoding vectors is predefined, and wherein each resource element group of the unicast PDCCH is precoded with one of the precoding vectors.
16. The TP of claim 15, wherein a mapping from precoding vector to resource element group is performed in a cyclic manner.
17. A user equipment (UE), comprising:
a processor configured such that:
the UE receives a unicast physical downlink control channel (PDCCH) from a subset of transmission points of a set of transmission points associated with an eNodeB (eNB) that contains at least one resource element in each resource element group,
wherein the at least one resource element contains a UE-specific demodulation reference signal (DMRS) that the UE can use to decode the unicast PDCCH, and
wherein the UE performs the decoding without the use of a cell-specific reference signal broadcast by the eNB, and
wherein the UE does not receive the unicast PDCCH from a remainder of the set of transmission points.
18. The UE of claim 17, wherein the at least one resource element is not allocated for the cell-specific reference signal.
19. The UE of claim 17, wherein the UE-specific DMRS is a sequence of symbols carrying a bit sequence that allows the specific UE to decode the unicast PDCCH correctly.
20. The UE of claim 17, wherein the UE-specific DMRS is derived from at least one of:
a radio network temporary identifier assigned to the specific UE;
an identifier for the cell; and
a subframe index.
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.