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1. (WO2019032034) SELECTIVE SYMBOL REPETITION FOR SFBC ON SPDCCH
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CLAIMS

What is claimed is:

1 . A method (100), performed by a base station (1 1 ) operative in a wireless communication network, of selectively repeating a modulation symbol in an antenna diversity transmission of a control channel , comprising :

dividing (102) a plurality of Resource Elements, REs, into multiple pluralities of RE

groups, wherein

each plurality of RE groups is associated with an antenna port,

one or more RE groups of each plurality of RE groups comprise M REs, and at least one RE group of each plurality of RE groups comprises N 1 REs, and

groups of modulation symbols correspond to the RE groups; and for each plurality of RE groups (104), repeating (106) a modulation symbol of a group of modulation symbols corresponding to the RE group of N 1 REs; and transmitting (1 08) the modulation symbols within each plurality of RE groups on the antenna port associated with the plurality of RE groups.

2. The method (100) of claim 1 wherein N 1 differs from M .

3. The method (100) of any preceding claim further comprising:

transmitting the copied modulation symbol in a subcarrier adjacent to a subcarrier in which a modulation symbol that is not copied is transmitted.

4. The method (100) of any preceding claim wherein the copied modulation symbol occupies the last RE of the group of N1 REs, and the modulation symbol that is copied occupies a subcarrier adjacent to the subcarrier occupied by the copied modulation symbol.

5. The method (100) of any preceding claim wherein an RE group of the plurality of RE groups comprises N2 REs, where N2 differs from N 1 .

The method (100) of any preceding claim, wherein the modulation symbols within each group of N 1 REs are transmitted on

a first antenna port and a first set of subcarriers comprises a first number of non-zero modulation symbols;

a second antenna port and the first set of subcarriers comprises a second number of non-zero modulation symbols;

the first antenna port and a second set of subcarriers comprises the second number of non-zero modulation symbols; and

the second antenna port and the second set of subcarriers comprises the first number of non-zero modulation symbols.

7. The method (100) of any preceding claim, further comprising:

transmitting a P port reference signal and the downlink control channel in a first

subcarrier of an OFDM symbol; and

transmitting a repeated modulation symbol of one of the RE groups of N1 REs in a

second subcarrier of the OFDM symbol corresponding to a 2P port reference signal, where the 2P port reference signal would occupy the first subcarrier of the OFDM symbol.

8. A method (100) of receiving a control channel in a User Equipment, UE (31), operative in a wireless communication network, comprising:

assuming that a predetermined number of Demodulation Reference Signal, DMRS,

Resource Elements, REs, used for reception of a different physical channel than the control channel are present in each Orthogonal Frequency Division

Multiplexing, OFDM, symbol carrying the control channel; and

receiving control channel information in the REs of the OFDM symbol other than the assumed DMRS REs.

9. A method (100) of receiving a control channel in a User Equipment, UE (31), operative in a wireless communication network, comprising:

identifying which Resource Elements, REs, within a symbol carrying the control channel contain control channel information and which REs contain a reference signal not used for reception of the control channel, according to when the reference signal is not present in the REs; and

receiving control channel information carried in the control channel that indicates the presence of the reference signal in a set of Orthogonal Frequency Division Multiplexing, OFDM, symbols, the set of OFDM symbols containing the REs.

10. The method (100) of claim 9 wherein the reference signal comprises an aperiodic Channel State Information Reference Signal, CSI-RS.

1 1 . The method (100) of any of claims 9-10 wherein the aperiodic CSI-RS is received in symbols other than those carrying the control channel.

12. A base station (1 1) operative in a wireless communication network, comprising:

one or more antennas (20);

a transceiver (18) operatively connected to the antennas (20); and

processing circuitry (14) operatively connected to the transceiver (18), and operative to: divide (102) a plurality of Resource Elements, REs, into multiple pluralities of RE groups, wherein

each plurality of RE groups is associated with an antenna port, one or more RE groups of each plurality of RE groups comprise M REs, and one RE group of each plurality of RE groups comprises N1

REs, and

groups of modulation symbols correspond to the RE groups; and

for each plurality of RE groups (104), repeat (106) a modulation symbol of a group of modulation symbols corresponding to the RE group of N 1 REs; and

transmit (108) the modulation symbols within each plurality of RE groups on the antenna port associated with the plurality of RE groups.

13. The base station (1 1 ) of claim 12 wherein N 1 differs from M .

14. The base station (1 1 ) of any of claims 12-13 wherein the processing circuitry is further operative to:

transmit the copied modulation symbol in a subcarrier adjacent to a subcarrier in which a modulation symbol that is not copied is transmitted.

15. The base station (1 1 ) of any of claims 12-14 wherein the copied modulation symbol occupies the last RE of the group of N1 REs, and the modulation symbol that is copied occupies a subcarrier adjacent to the subcarrier occupied by the copied modulation symbol.

16. The base station (1 1 ) of any of claims 12-15 wherein an RE group of the plurality of RE groups comprises N2 REs, where N2 differs from N 1 .

17. The base station (1 1 ) of any of claims 12-16, wherein the modulation symbols within each RE group of N 1 REs are transmitted on

a first antenna port and a first set of subcarriers comprises a first number of non-zero modulation symbols;

a second antenna port and the first set of subcarriers comprises a second number of non-zero modulation symbols;

the first antenna port and a second set of subcarriers comprises the second number of non-zero modulation symbols; and

the second antenna port and the second set of subcarriers comprises the first number of non-zero modulation symbols.

18. The base station (1 1) of any of claims 12-17, wherein the processing circuitry is further operative to:

transmit a P port reference signal and the downlink control channel in a first subcarrier of an OFDM symbol; and

transmit a repeated modulation symbol of one of the RE groups of N1 REs in a second subcarrier of the OFDM symbol corresponding to a 2P port reference signal, where the 2P port reference signal would occupy the first subcarrier of the OFDM symbol.

19. A User Equipment, UE (31), operative in a wireless communication network, comprising: one or more antennas (40);

a transceiver (38) operatively connected to the antennas (40); and

processing circuitry (34) operatively connected to the transceiver (40), and operative to receive a control channel by:

identifying which Resource Elements, REs, contain the control channel and

which contain a reference signal not used for reception of the control channel according to when the reference signal is not present in the REs; and

receiving control channel information carried in the control channel that indicates the presence of a reference signal in set of Orthogonal Frequency Division Multiplexing, OFDM, symbols, the set of OFDM symbols containing the REs.

20. The UE (31) of claim 19 wherein the reference signal comprises an aperiodic Channel State Information Reference Signal, CSI-RS.

21 . The UE (31 ) of any of claims 19-20 wherein the aperiodic CSI-RS is received in symbols other than those carrying the control channel.

22. A method , performed by a User Equipment, UE (31 ), operative in a wireless

communication network, of receiving a control channel wherein a modulation symbol in an antenna diversity transmission of the control channel has been selectively repeated, comprising: dividing a plurality of Resource Elements, REs, into multiple pluralities of RE groups, wherein

each plurality of RE groups is associated with an antenna port,

one or more RE groups of each plurality of RE groups comprise M REs, and one

RE group of each plurality of RE groups comprises N 1 REs, and groups of modulation symbols correspond to the RE groups; and for each plurality of RE groups,

determining that a modulation symbol of a group of modulation symbols

corresponding to the RE group of N 1 REs has been copied; and receiving the modulation symbols within each plurality of RE groups, wherein the modulation symbols within each plurality of RE groups have been transmitted on the antenna port associated with the plurality of RE groups.

23. The method of claim 22 wherein N 1 differs from M.

24. The method of any of claims 22-23 further comprising:

receiving the copied modulation symbol in a subcarrier adjacent to a subcarrier in which a modulation symbol that is not copied was transmitted.

25. The method of any of claims 22-24 wherein the copied modulation symbol occupies the last RE of the group of N1 REs, and the modulation symbol that is copied occupies a subcarrier adjacent to the subcarrier occupied by the copied modulation symbol .

26. The method of any of claims 22-25 wherein an RE group of the plurality of RE groups comprises N2 REs, where N2 differs from N1 .

27. The method of any of claims 22-26, wherein the modulation symbols within each RE group of N1 REs were transmitted on

a first antenna port and a first set of subcarriers comprises a first number of non-zero modulation symbols;

a second antenna port and the first set of subcarriers comprises a second number of non-zero modulation symbols;

the first antenna port and a second set of subcarriers comprises the second number of non-zero modulation symbols; and

the second antenna port and the second set of subcarriers comprises the first number of non-zero modulation symbols.

28. The method of any of claims 22-27, further comprising:

receiving a P port reference signal and the downlink control channel in a first subcarrier of an OFDM symbol; and

receiving a repeated modulation symbol of one of the RE groups of N1 REs in a second subcarrier of the OFDM symbol corresponding to a 2P port reference signal, where the 2P port reference signal would occupy the first subcarrier of the OFDM symbol.

29. A non-transitory computer readable medium (16) having stored thereon instructions (22) operative to cause processing circuitry (14) on a base station (1 1) operative in a wireless communication network to selectively repeat a modulation symbol in an antenna diversity transmission of a control channel, by performing the steps of:

dividing (102) a plurality of Resource Elements, REs, into multiple pluralities of RE

groups, wherein

each plurality of RE groups is associated with an antenna port, one or more RE groups of each plurality of RE groups comprise M REs, and one

RE group of each plurality of RE groups comprises N1 REs, and groups of modulation symbols correspond to the RE groups; and for each plurality of RE groups (104), repeating (106) a modulation symbol of a group of modulation symbols corresponding to the RE group of N 1 REs; and transmitting (108) the modulation symbols within each plurality of RE groups on the antenna port associated with the plurality of RE groups.

30. A non-transitory computer readable medium (36) having stored thereon instructions (42) operative to cause processing circuitry (34) on User Equipment, UE (31), operative in a wireless communication network to receive a control channel, by performing the steps of:

assuming that a predetermined number of Demodulation Reference Signal, DMRS,

Resource Elements, REs, used for reception of a different physical channel than the control channel are present in each Orthogonal Frequency Division

Multiplexing, OFDM, symbol carrying the control channel; and

receiving control channel information in the REs of the OFDM symbol other than the assumed DMRS REs.

31 . A non-transitory computer readable medium (36) having stored thereon instructions (42) operative to cause processing circuitry (34) on User Equipment, UE (31), operative in a wireless communication network to receive a control channel, by performing the steps of:

identifying which Resource Elements, REs, within a symbol carrying the control channel contain control channel information and which REs contain a reference signal not used for reception of the control channel, according to when the reference signal is not present in the REs; and

receiving control channel information carried in the control channel that indicates the presence of the reference signal in a set of Orthogonal Frequency Division Multiplexing, OFDM, symbols, the set of OFDM symbols containing the REs.