Obtaining control channel elements of physical downlink control channels for cross-carrier scheduling

• US 10,165,582 B2
• Filed: 10/08/2015
• Issued: 12/25/2018
• Est. Priority Date: 01/03/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Papasakellariou, Aris
• Primary Examiner(s): Islam, Rownak
• Application Number:
  US14/878,966
• Publication Number:
  US 20160037543A1
• Time in Patent Office: 1,174 Days
• Field of Search: 370329
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Methods and apparatus of a NodeB or a user equipment (UE) in communication with each other are provided. The NodeB transmits and the UE receives via a Physical Downlink Control Channel (PDCCH). Control Channel Elements (CCEs) corresponding to a PDCCH candidate are obtained based on n_CI, where n_CI is a carrier index.

Claims

1. A method for a physical downlink control channel (PDCCH) candidate reception in a time unit k, the method comprising:

receiving

a configuration for a set of C cells,

a configuration for a set p of physical resource blocks (PRBs) that includes a total number of N_CCE,p,k control channel elements (CCEs), wherein the PDCCH candidate reception is over an aggregation level of L CCEs from a predetermined set of aggregation levels of CCEs from the N_CCE,p,k CCEs,

a configuration, per cell from the set of C cells, for a cell index n_CI, and

a configuration, per cell from the set of C cells, for a number of M_p,nCI^(L) PDCCH candidate receptions resulting in a set of numbers of PDCCH candidate receptions for the C cells, wherein each PDCCH candidate reception is over the aggregation level of L CCEs; and

determining indices for the number of CCEs of the PDCCH candidate receptions with the aggregation level of L CCEs as a function of a maximum number of PDCCH candidate receptions with the aggregation level of L CCEs from the set of numbers of PDCCH candidate receptions with L CCEs for the C cells in the set of p PRBs.

2. The method of claim 1, wherein the PDCCH candidate reception is on a cell from the set of C cells with index n_CI=0.

3. The method of claim 2, wherein the indices for the number of CCEs of the PDCCH candidate reception are determined as

4. The method of claim 3, further comprising:

receiving the configuration for the number of PDCCH candidate receptions only for the cell with n_CI=0 and is same for every other cell from the set of C cells, and

determining the indices for the number of CCEs of the PDCCH candidate reception as

5. The method of claim 1, wherein a total number of N_CCE,p,k1 CCEs in PRB set p in a time unit k₁ is different than a total number of N_CCE,p,k2 CCEs in PRB set p in a time unit k₂.

6. The method of claim 1, further comprising receiving:

a configuration for a second set of PRBs p₂ that includes a second total number of N_CCE,p2,k CCEs, wherein the PDCCH candidate reception is over a number of the aggregation level of L CCEs from a predetermined set of numbers of CCEs from the N_CCE,p2,k CCEs, and

a configuration, per cell from the set of C cells, for a second number of M_p,nCI,2^(L) PDCCH candidate receptions, wherein each PDCCH candidate reception is over the aggregation level of L CCEs.

7. The method of claim 1, wherein the PDCCH includes a downlink control information (DCI) format for scheduling data transmission or data reception on a cell from the set of C cells,

wherein the DCI format for scheduling data transmission or data reception on a cell with index n_CI includes a carrier indicator field (CIF) that provides the index n_CI when

8. A user equipment (UE), comprising:

a receiver for receiving;

a configuration for a set of C cells,

a configuration for a set p of physical resource blocks (PRBs) that includes a total number of N_CCE,p,k control channel elements (CCEs), wherein a physical downlink control channel (PDCCH) candidate reception is over an aggregation level of L CCEs from a predetermined set of numbers of CCEs from the N_CCE,p,k CCEs,

a configuration, per cell from the set of C cells, for a cell index n_CI, and

a configuration, per cell from the set of C cells, for a number of M_p,nCI^(L) PDCCH candidate receptions resulting to a set of numbers of PDCCH candidate receptions for the C cells, wherein each PDCCH candidate reception is over the aggregation level of L CCEs; and

a processor for determining indices for the number of CCEs of the PDCCH candidate reception with the aggregation level of L CCEs as a function of a maximum number of PDCCH candidate receptions with the aggregation level of L CCEs from the set of numbers of PDCCH candidate receptions with the aggregation level of L CCEs for the C cells in the set of p PRBs.

9. The UE of claim 8, wherein the PDCCH candidate reception is on a cell from the set of C cells with index n_CI=0.

10. The UE of claim 9, wherein the processor determines indices for the number of CCEs of the PDCCH candidate reception as

11. The UE of claim 10, wherein the receiver receives the configuration for the number of PDCCH candidate receptions only for the cell with n_CI=0 and the configuration is the same for every other cell from the set of C cells, and wherein the processor determines the indices for the number of CCEs of the PDCCH candidate reception as

12. The UE of claim 8, wherein a total number of N_CCE,p,k1 CCEs in PRB set p in a time unit k₁ is different than a total number of N_CCE,p,k2 CCEs in PRB set p in a time unit k₂.

13. The UE of claim 8, wherein the receiver further receives:

a configuration for a second set of PRBs p₂ that includes a second total number of N_CCE,p2,k CCEs, wherein the PDCCH candidate reception is over an aggregation level of L CCEs from a predetermined set of numbers of CCEs from the N_CCE,p2,k CCEs, and

a configuration, per cell from the set of C cells, for a second number of M_p,nCI,2^(L) PDCCH candidate receptions, wherein each PDCCH candidate reception is over the aggregation level of L CCEs.

14. The UE of claim 8, wherein the PDCCH includes a downlink control information (DCI) format for scheduling data transmission or data reception on a cell from the set of C cells,

wherein the DCI format for scheduling data transmission or data reception on a cell with index n_CI includes a carrier indicator field (CIF) that provides the index n_CI when

15. A base station, comprising:

a transmitter for transmitting;

a configuration for a set of C cells,

a configuration for a set p of physical resource blocks (PRBs) that includes a total number of N_CCE,p,k control channel elements (CCEs), wherein a physical downlink control channel (PDCCH) candidate transmission is over an aggregation level of L CCEs from a predetermined set of numbers of CCEs from the N_CCE,p,k CCEs,

a configuration, per cell from the set of C cells, for a cell index n_CI, and

a configuration, per cell from the set of C cells, for a number of M_p,nCI^(L) PDCCH candidate transmissions resulting to a set of numbers of PDCCH candidate transmissions for the C cells, wherein each PDCCH candidate transmission is over the aggregation level of L CCEs; and

a processor for determining indices for the number of CCEs of the PDCCH candidate transmission with the aggregation level of L CCEs as a function of a maximum number of PDCCH candidate transmissions with the aggregation level of L CCEs from the set of numbers of PDCCH candidate transmissions with the aggregation level of L CCEs for the C cells in the set of p PRBs.

16. The base station of claim 15, wherein the PDCCH candidate transmission is on a cell from the set of C cells with index n_CI=0.

17. The base station of claim 16, wherein the processor determines indices for the number of CCEs of the PDCCH candidate transmission as

18. The base station of claim 17, wherein the transmitter transmits the configuration for the number of PDCCH candidate transmissions only for the cell with n_CI=0 and the configuration is the same for every other cell from the set of C cells, and wherein the processor determines the indices for the number of CCEs of the PDCCH candidate transmission as

19. The base station of claim 15, wherein a total number of N_CCE,p,k1 CCEs in PRB set p in a time unit k₁ is different than a total number of N_CCE,p,k2 CCEs in PRB set p in a time unit k₂.

20. The base station of claim 15, wherein the transmitter further transmits:

a configuration for a second set of PRBs p₂ that includes a second total number of N_CCE,p2,k CCEs, wherein the PDCCH candidate transmission is over an aggregation level of L CCEs from a predetermined set of numbers of CCEs from the N_CCE,p2,k CCEs, and

a configuration, per cell from the set of C cells, for a second number of M_p,nCI,2^(L) PDCCH candidate transmissions, wherein each PDCCH candidate transmission is over the aggregation level of L CCEs.