MULTIPLEXING RESOURCE ELEMENT GROUPS FOR CONTROL CHANNEL ELEMENTS OF CONTROL CHANNELS

• US 20140071915A1
• Filed: 09/09/2013
• Published: 03/13/2014
• Est. Priority Date: 09/07/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PAPASAKELLARIOU, Aris, JI, Hyoung-Ju, Han, Jin-Kyu
• Granted Patent: US 9,479,301 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Methods and apparatus are described for forming Control Channel Elements (CCEs) from Resource Element Groups (REGs) that are located in one or more Physical Resource Block (PRB) pairs from a set of PRB pairs, for determining a first symbol in a Transmission Time Interval (TTI) for a Physical Downlink Shared Channel (PDSCH), and for determining whether the PDSCH includes all PRB pairs indicated by a respective PDCCH scheduling the PDSCH.

Claims

1. A method for a User Equipment (UE) to receive a Physical Downlink Shared CHannel (PDSCH) transmitted by a base station in a serving cell over a Transmission Time Interval (TTI), wherein the PDSCH is scheduled either by a first type Physical Downlink Control CHannel (PDCCH), or by a second type PDCCH, or occurs semi-persistently without scheduling by a PDCCH, wherein the base station transmits the first type PDCCH either in a UE-Common Search Space (UE-CSS) or in a first UE-Dedicated Search Space (UE-DSS) in the serving cell, and wherein the base station transmits the second type PDCCH in a second UE-DSS in the serving cell, the method comprising the steps of:

receiving higher layer signaling from the base station that informs of a binary pattern corresponding to a number of TTIs, wherein each binary pattern value for each respective TTI in the number of TTIs indicates to the UE to receive either first type PDCCHs in the first UE-DSS or second type PDCCHs in the second UE-DSS;

receiving higher layer signaling from the base station that informs of a parameter “

epdcch-StartSymbol”

indicating an initial symbol for receiving second type PDCCHs in the second UE-DSS;

receiving a physical channel from the base station that conveys a field indicating a duration of M_symb^DL symbols for receiving first type PDCCHs in the TTI;

determining a first symbol in the TTI as “

epdcch-StartSymbol”

if the binary pattern value for the TTI indicates reception of second type PDCCHs in the second UE-DSS and the PDSCH is scheduled by a second type PDCCH in the second UE-DSS;

determining a first symbol in the TTI as M_symb^DL+1 if the binary pattern value for the TTI indicates reception of second type PDCCHs in the TTI and the PDSCH is scheduled by a first type PDCCH in the UE-CSS;

determining a first symbol in the TTI, for a semi-persistent PDSCH, as M_symb^DL+1 if the binary pattern value for the TTI indicates reception of first type PDCCHs in the first UE-DSS or as “

epdcch-StartSymbol”

if the binary pattern value for the TTI indicates reception of second type PDCCHs in the second UE-DSS; and

receiving the PDSCH from the first symbol in the TTI until a last symbol of the TTI.

2. The method of claim 1, wherein for the semi-persistent PDSCH and the binary pattern value indicating transmission of second type PDCCHs in the second UE-DSS, the base station transmits to the UE a first type PDCCH in the CSS that conveys a power control command for adjusting a power of an uplink transmission by the UE.

3. A method for a base station to transmit a Physical Downlink Shared CHannel (PDSCH) to a User Equipment (UE) in a serving cell over a Transmission Time Interval (TTI), wherein the PDSCH is scheduled either by a first type Physical Downlink Control CHannel (PDCCH), or by a second type PDCCH, or occurs semi-persistently without scheduling by a PDCCH, wherein the base station transmits the first type PDCCH either in a UE-Common Search Space (UE-CSS) or in a first UE-Dedicated Search Space (UE-DSS) in the serving cell, and wherein the base station transmits the second type PDCCH in a second UE-DSS in the serving cell, the method comprising the steps of:

transmitting higher layer signaling to the UE that informs of a binary pattern corresponding to a number of TTIs, wherein each binary pattern value for each respective TTI in the number of TTIs indicates to the UE to receive either first type PDCCHs in the first UE-DSS or second type PDCCHs in the second UE-DSS;

transmitting higher layer signaling to the UE that informs of a parameter “

epdcch-StartSymbol”

indicating an initial symbol for receiving second type PDCCHs in the second UE-DSS;

transmitting a physical channel that conveys a field indicating a duration of M_symb^DL symbols for receiving first type PDCCHs in the TTI;

determining a first symbol in the TTI as “

epdcch-StartSymbol”

if the binary pattern value indicates transmission of second type PDCCHs in the second UE-DSS in the TTI and the PDSCH is scheduled by a second type PDCCH in the second UE-DSS;

determining a first symbol in the TTI as M_symb^DL+1 if the binary pattern value indicates transmission of second type PDCCHs in the TTI and the PDSCH is scheduled by a first type PDCCH in the UE-CSS;

determining a first symbol in the TTI, for a semi-persistent PDSCH, as M_symb^DL+1 if the binary pattern value indicates transmission of first type PDCCHs in the first UE-DSS in the TTI or as “

epdcch-StartSymbol”

if the binary pattern value indicates transmission of second type PDCCHs in the second UE-DSS in the TTI; and

transmitting the PDSCH from the first symbol in the TTI until the last symbol of the TTI.

4. The method of claim 3, wherein for the semi-persistent PDSCH and the binary pattern value indicating transmission of second type PDCCHs in the second UE-DSS, the base station transmits to the UE a first type PDCCH in the CSS that conveys a power control command for adjusting a power of an uplink transmission by the UE.

5. A method for a User Equipment (UE) to receive a Physical Downlink Shared CHannel (PDSCH) that is scheduled by a Physical Downlink Control CHannel (PDCCH) transmitted by a base station over first Physical Resource Block (PRB) pairs from a set of PRB pairs that includes second PRB pairs, wherein a PRB pair includes a number of sub-carriers over a Transmission Time Interval (TTI) and wherein the number of second PRB pairs is larger than the number of first PRB pairs, the method comprising the steps of:

detecting the PDCCH in the first PRB pairs wherein the PDCCH conveys control information scheduling PDSCH reception in third PRB pairs that include at least one PRB pair from the second PRB pairs that is not in the first PRB pairs; and

receiving the PDSCH in the third PRB pairs if the first PRB pairs include only one PRB pair or receiving the PDSCH in the third PRB pairs after excluding the at least one PRB pair if the first PRB pairs include more than one PRB pair.

6. The method of claim 5, wherein if the first PRB pairs include more than one PRB pair the PDCCH is transmitted in one Control Channel Element (CCE).

7. The method of claim 5, wherein the set of PRB pairs is informed to the UE by the base station using higher layer signaling.

8. The method of claim 7, wherein the higher layer signaling informs of a first set of PRB pairs and of a second set of PRB pairs for transmitting PDCCHs and if the set of PRB pairs is the second set of PRB pairs, the UE excludes from PDSCH reception PRB pairs in the third PRB pairs that are also in the first set of PRB pairs.

9. A method for a base station to transmit a Physical Downlink Shared CHannel (PDSCH) to a User Equipment (UE), wherein the PDSCH is scheduled by a Physical Downlink Control CHannel (PDCCH) transmitted by the base station over first Physical Resource Block (PRB) pairs from a set of PRB pairs that includes second PRB pairs, wherein a PRB pair includes a number of sub-carriers over a Transmission Time Interval (TTI), and wherein the number of second PRB pairs is larger than the number of first PRB pairs, the method comprising the steps of:

transmitting the PDCCH in the first PRB pairs wherein the PDCCH includes control information scheduling the PDSCH transmission in third PRB pairs that include at least one PRB pair from the second PRB pairs that is not in the first PRB pairs; and

transmitting the PDSCH in the third PRB pairs if the first PRB pairs include only one PRB pair or transmitting the PDSCH in the third PRB pairs after excluding the at least one PRB pair if the first PRB pairs include more than one PRB pair.

10. The method of claim 9, wherein if the PRB pairs include more than one PRB pair the PDCCH is transmitted in one Control Channel Element (CCE).

11. The method of claim 9, wherein the base station informs the set of PRB pairs to the UE using higher layer signaling.

12. The method of claim 11, wherein the higher layer signaling informs of a first set of PRB pairs and of a second set of PRB pairs for transmitting PDCCHs and if the set of PRB pairs is the second set of PRB pairs, the base station excludes from PDSCH transmission PRB pairs in the third PRB pairs that are also in the first set of PRB pairs.

13. A User Equipment (UE) apparatus for receiving a Physical Downlink Shared CHannel (PDSCH) transmitted from a base station in a serving cell over a Transmission Time Interval (TTI), wherein the PDSCH reception is scheduled either by a first type Physical Downlink Control CHannel (PDCCH), or by a second type PDCCH, or it occurs semi-persistently without scheduling by a PDCCH, wherein the base station transmits the first type PDCCH either in a UE-Common Search Space (UE-CSS) or in a first UE-Dedicated Search Space (UE-DSS) in the serving cell, and wherein the base station transmits the second type PDCCH in a second UE-DSS in the serving cell, the apparatus comprising:

a receiver for receiving from the base station

a) first higher layer signaling that informs of a binary pattern corresponding to a number of TTIs, wherein each binary pattern value for each respective TTI in the number of TTIs indicates to the apparatus to receive either first type PDCCHs in the first UE-DSS or second type PDCCHs in the second UE-DSS,

b) second higher layer signaling that informs of a parameter “

epdcch-StartSymbol”

, wherein “

epdcch-StartSymbol”

indicates an initial symbol for receiving second type PDCCHs in the second UE-DSS,

c) a physical channel that conveys a field, wherein the field indicates a duration of M_symb^DL symbols for receiving first type PDCCHs in the TTI,

d) first type PDCCHs in the UE-CSS and either first type PDCCHs in the first UE-DSS or second type PDCCHs in the second UE-DSS as determined by a binary pattern value for the TTI, and

e) the PDSCH from a first symbol of the TTI until a last symbol of the TTI; and

a computing unit for determining the first symbol of the TTI as

a) “

epdcch-StartSymbol”

if the binary pattern value indicates reception of second type PDCCHs in the second UE-DSS and the PDSCH is scheduled by a second type PDCCH in the second UE-DSS, or

b) as M_symb^DL+1 if the binary pattern value indicates reception of second type PDCCHs in the second UE-DSS and the PDSCH is scheduled by a first type PDCCH in the UE-CSS, or

c) for a semi-persistent PDSCH, as M_symb^DL+1 if the binary pattern value indicates reception of first type PDCCHs in the first UE-DSS or as “

epdcch-StartSymbol”

if the binary pattern value indicates reception of second type PDCCHs in the second UE-DSS.

14. The apparatus of claim 13, wherein for the semi-persistent PDSCH and the binary pattern value indicating transmission of second type PDCCHs in the second UE-DSS, the base station transmits to the apparatus a first type PDCCH in the CSS that conveys a power control command for adjusting a power of an uplink transmission by the apparatus.

15. A base station apparatus for transmitting a Physical Downlink Shared CHannel (PDSCH) transmitted to a User Equipment (UE) in a serving cell over a Transmission Time Interval (TTI), wherein the PDSCH reception is scheduled either by a first type Physical Downlink Control CHannel (PDCCH), or by a second type PDCCH, or occurs semi-persistently without scheduling by a PDCCH, wherein the apparatus transmits the first type PDCCH either in a UE-Common Search Space (UE-CSS) or in a first UE-Dedicated Search Space (UE-DSS) in the serving cell, and wherein the apparatus transmits the second type PDCCH in a second UE-DSS in the serving cell, the apparatus comprising:

a transmitter for transmitting to the UE

a) first higher layer signaling that informs of a binary pattern corresponding to a number of TTIs, wherein each binary pattern value for each respective TTI in the number of TTIs indicates to the UE to receive either first type PDCCHs in the first UE-DSS or second type PDCCHs in the second UE-DSS,

b) second higher layer signaling that informs of a parameter “

epdcch-StartSymbol”

, wherein “

epdcch-StartSymbol”

indicates an initial symbol for receiving second type PDCCHs in the second UE-DSS,

c) a physical channel that conveys a field, wherein the field indicates a duration of M_symb^DL symbols for receiving first type PDCCHs in the TTI,

d) first type PDCCHs in the UE-CSS and either first type PDCCHs in the first UE-DSS or second type PDCCHs in the second UE-DSS as determined by a binary pattern value for the TTI, and

e) the PDSCH from a first symbol of the TTI until a last symbol of the TTI; and

a computing unit for determining the first symbol of the TTI as

a) “

epdcch-StartSymbol”

if the binary pattern value indicates reception of second type PDCCHs in the second UE-DSS and the PDSCH is scheduled by a second type PDCCH in the second UE-DSS, or

b) as M_symb^DL+1 if the binary pattern value indicates reception of second type PDCCHs in the second UE-DSS and the PDSCH is scheduled by a first type PDCCH in the UE-CSS, or

c) for a semi-persistent PDSCH, as M_symb^DL+1 if the binary pattern value indicates reception of first type PDCCHs in the first UE-DSS or as “

epdcch-StartSymbol”

if the binary pattern value indicates reception of second type PDCCHs in the second UE-DSS.

16. The apparatus of claim 15, wherein for the semi-persistent PDSCH and the binary pattern value indicating transmission of second type PDCCHs in the second UE-DSS, the apparatus transmits to the UE a first type PDCCH in the CSS that conveys a power control command for adjusting a power of an uplink transmission by the UE.

17. A User Equipment (UE) apparatus for receiving a Physical Downlink Shared CHannel (PDSCH) that is scheduled by a Physical Downlink Control CHannel (PDCCH) transmitted by a base station over first Physical Resource Block (PRB) pairs from a set of PRB pairs that includes second PRB pairs, wherein a PRB pair includes a number of sub-carriers over a Transmission Time Interval (TTI) and wherein the number of second PRB pairs is larger than the number of first PRB pairs, the apparatus comprising:

a detector for detecting the PDCCH in the first PRB pairs wherein the PDCCH conveys control information scheduling the PDSCH reception in third PRB pairs that include at least one PRB pair from the second PRB pairs that is not in the first PRB pairs; and

a receiver for receiving the PDSCH in the third PRB pairs if the first PRB pairs include only one PRB pair or for receiving the PDSCH in the third PRB pairs after excluding the at least one PRB pair if the first PRB pairs include more than one PRB pair.

18. The apparatus of claim 17, wherein if the first PRB pairs include more than one PRB pair the PDCCH is transmitted in one Control Channel Element (CCE).

19. The apparatus of claim 17, wherein the set of PRB pairs is informed to the apparatus by the base station using higher layer signaling.

20. The apparatus of claim 19, wherein the higher layer signaling informs of a first set of PRB pairs and of a second set of PRB pairs for transmitting PDCCHs and if the set of PRB pairs is the second set of PRB pairs, the apparatus excludes from PDSCH reception PRB pairs in the third PRB pairs that are also in the first set of PRB pairs.

21. A base station apparatus for transmitting a Physical Downlink Shared CHannel (PDSCH) to a User Equipment (UE), wherein the PDSCH is scheduled by a Physical Downlink Control CHannel (PDCCH) transmitted by the apparatus over first Physical Resource Block (PRB) pairs from a set of PRB pairs that includes second PRB pairs, wherein a PRB pair includes a number of sub-carriers over a Transmission Time Interval (TTI), and wherein the number of second PRB pairs is larger than the number of first PRB pairs, the apparatus comprising:

a PDCCH transmitter for transmitting the PDCCH in the first PRB pairs wherein the PDCCH includes control information scheduling the PDSCH in third PRB pairs that include at least one PRB pair from the second PRB pairs that is not in the first PRB pairs; and

a PDSCH transmitter for transmitting the PDSCH in the third PRB pairs if the first PRB pairs include only one PRB pair or for transmitting the PDSCH in the third PRB pairs after excluding the at least one PRB pair if the first PRB pairs include more than one PRB pair.

22. The apparatus of claim 21, wherein if the PRB pairs include more than one PRB pair the PDCCH is transmitted in one Control Channel Element (CCE).

23. The apparatus of claim 21, wherein the apparatus informs the set of PRB pairs to the UE using higher layer signaling.

24. The apparatus of claim 21, wherein the higher layer signaling informs of a first set of PRB pairs and of a second set of PRB pairs for transmitting PDCCHs and if the set of PRB pairs is the second set of PRB pairs, the UE excludes from PDSCH reception PRB pairs in the third PRB pairs that are also in the first set of PRB pairs.