METHOD AND DEVICE FOR SENDING AND RECEIVING EPDCCH, BASE STATION, AND USER EQUIPMENT

• US 20150215904A1
• Filed: 07/31/2013
• Published: 07/30/2015
• Est. Priority Date: 07/31/2012
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Dai, Bo, Chen, Yijian, Shi, Jing, Sun, Yunfeng, Zuo, Zhisong
• Granted Patent: US 9,609,640 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 72/00 Local resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Provided are a method and a device for sending and receiving an ePDCCH, a base station, and user equipment. The method includes: a base station mapping enhanced resource element groups (eREGs) corresponding to an ePDCCH to different resource elements, wherein each of the eREGs corresponding to the ePDCCH is located in one physical resource block pair; and the base station sending the ePDCCH on the resource elements. The disclosure improves the reliability and resource utilization of ePDCCH transmission.

Claims

1. A method for sending enhanced Physical Downlink Control Channel (ePDCCH), comprising:

a base station mapping enhanced resource element groups (eREGs) corresponding to the ePDCCH to different resource elements, wherein each of the eREGs corresponding to the ePDCCH is located in one physical resource block pair, the base station mapping the eREGs corresponding to the ePDCCH to different resource elements comprises;

the base station partitioning physical resource block pairs corresponding to the ePDCCH into eREGs, and the base station mapping the ePDCCH to predefined eREGs; and

the base station sending the ePDCCH on the resource elements.

2. The method according to claim 1, wherein the one physical resource block pair comprises n eREGs, and the n eREGs on different physical resource blocks are mapped to different resource element positions in the different physical resource blocks, where n is an integer greater than or equal to 1.

3. The method according to claim 1, wherein the base station partitioning the physical resource block pairs corresponding to the ePDCCH into eREGs comprises:

the base station numbering resource elements used for the ePDCCH according to an order of a time domain first and then a frequency domain or an order of the frequency domain first and then the time domain; and

partitioning the numbered resource elements into eREGs.

4. The method according to claim 3, wherein partitioning the numbered resource elements into eREGs comprises one of the following:

partitioning the numbered resource elements into the eREGs at equal intervals;

partitioning the numbered resource elements into the eREGs in a continuous manner according to the sequence of the numbered resource elements;

inputting the numbered resource elements into a subblock interleaver, and sequentially partitioning resource elements output from the subblock interleaver into the eREGs; and

inputting the numbered resource elements into a subblock interleaver, performing cyclic shift for resource elements output from the subblock interleaver, and then partitioning resource elements subjected to the cyclic shift into the eREGs.

5. The method according to claim 1, wherein

an initial time domain position of physical resources corresponding to the ePDCCH is the same as an initial time domain position of a physical downlink shared channel (PDSCH) scheduled by the ePDCCH, wherein the ePDCCH and the PDSCH are in a same serving cell;

or

when downlink control information corresponding to a PDSCH of a serving cell is carried by the ePDCCH, an initial time domain position of the PDSCH of the serving cell is determined according to an initial symbol indication signalling.

6. The method according to claim 1, wherein a frequency domain position of physical resources corresponding to the ePDCCH is a signalling configured or predefined position, wherein the predefined position comprises one of the following:

two sidebands of a system bandwidth, N physical resource blocks of each of the two sidebands of the system bandwidth, N physical resource blocks in a system which are mapped at intervals, and N physical resource blocks at the center of the system bandwidth, where N is an integer greater than 0.

7. The method according to any one of claims 1 to 4, wherein when downlink control information corresponding to a PDSCH of a serving cell is carried by the ePDCCH, an initial time domain position of the PDSCH of the serving cell is determined according to an initial symbol indication signalling.

8. The method according to claim 1, wherein the base station encodes the ePDCCH according to physical resources with one or more predefined physical resource blocks removed, wherein the one or more predefined physical resource blocks are the same as one or more physical resource blocks where a secondary synchronization channel is located, and eREGs corresponding to the one or more predefined physical resource blocks do not carry the ePDCCH.

9. The method according to claim 1, wherein mapping the eREGs corresponding to the ePDCCH to different resource elements comprises:

mapping virtual eREGs to the eREGs, wherein the eREGs correspond to physical resources, and the virtual eREGs correspond to logical units of the ePDCCH; and

the virtual eREGs comprise continuous virtual eREGs and discrete virtual eREGs, wherein the continuous virtual eREGs are mapped to eREGs having the same serial numbers as the continuous virtual eREGs, and the discrete virtual eREGs are mapped to predefined eREGs.

10. The method according to claim 9, wherein mapping the discrete virtual eREGs to the predefined eREGs comprises:

partitioning discrete eREGs into one or more discrete virtual eREG sets;

partitioning the eREGs into one or more eREG sets; and

setting the one or more discrete virtual eREG sets and the one or more eREG sets in a one-to-one correspondence, wherein the number of discrete virtual eREGs in each discrete virtual eREG set is equal to the number of eREGs in each eREG set.

11. The method according to claim 1, wherein the one physical resource block pair contains n eREGs,

wherein the n value corresponding to the physical resource block with a normal cyclic prefix subframe is the same as the n value corresponding to the physical resource block with an extended cyclic prefix subframe;

or, the one physical resource block contains n eREGs, wherein the n value is determined according to a predefined scenario, wherein the predefined scenario comprises at least one of the following;

extended cyclic prefix configured general subframes, normal cyclic prefix configured general subframes, an extended cyclic prefix configured special subframe set 1, an extended cyclic prefix configured special subframe set 2, a normal cyclic prefix configured special subframe set 1, and a normal cyclic prefix configured special subframe set 2, and n is an integer greater than or equal to 1.

12. A method for receiving enhanced Physical Downlink Control Channel (ePDCCH), comprising:

user equipment (UE) determining resource elements to which enhanced resource element groups (eREGs) corresponding to an ePDCCH are mapped, wherein each of the eREGs corresponding to the ePDCCH is located in one physical resource block pair; and

the UE receiving the ePDCCH on the resource elements.

13. The method according to claim 12, wherein the eREGs corresponding to the ePDCCH are mapped to different resource elements by the following manners:

the base station partitioning physical resource block pairs corresponding to the ePDCCH into eREGs; and

the base station mapping the ePDCCH to predefined eREGs.

14. The method according to claim 13, wherein the base station partitioning the physical resource block pairs corresponding to the ePDCCH into the eREGs comprises:

the base station numbering resource elements used for the ePDCCH according to an order of a time domain first and then a frequency domain or an order of the frequency domain first and then the time domain; and

partitioning the numbered resource elements into eREGs.

15. The method according to claim 14, wherein partitioning the numbered resource elements into eREGs comprises one of the following:

partitioning the numbered resource elements into the eREGs at equal intervals;

partitioning the numbered resource elements into the eREGs in a continuous manner according to the sequence of the numbered resource elements;

inputting the numbered resource elements into a subblock interleaver, and sequentially partitioning resource elements output from the subblock interleaver into the eREGs; and

inputting the numbered resource elements into a subblock interleaver, performing cyclic shift for resource elements output from the subblock interleaver, and then partitioning resource elements subjected to the cyclic shift into the eREGs.

16. The method according to claim 12, wherein

an initial time domain position of physical resources corresponding to the ePDCCH is the same as an initial time domain position of a physical downlink shared channel (PDSCH) scheduled by the ePDCCH, wherein the ePDCCH and the PDSCH are in a same serving cell.

17. The method according to claim 12, wherein mapping the eREGs corresponding to the ePDCCH to different resource elements comprises:

mapping virtual eREGs to the eREGs, wherein the eREGs correspond to physical resources, and the virtual eREGs correspond to logical units of the ePDCCH; and

the virtual eREGs comprise continuous virtual eREGs and discrete virtual eREGs, wherein the continuous virtual eREGs are mapped to eREGs having the same serial numbers as the continuous virtual eREGs, and the discrete virtual eREGs are mapped to predefined eREGs.

18. The method according to claim 17, wherein mapping the discrete virtual eREGs to the predefined eREGs comprises:

partitioning discrete eREGs into one or more discrete virtual eREG sets;

partitioning the eREGs into one or more eREG sets; and

setting the one or more discrete virtual eREG sets and the one or more eREG sets in a one-to-one correspondence, wherein the number of discrete virtual eREGs in each discrete virtual eREG set is equal to the number of eREGs in each eREG set.

19. The method according to claim 12, wherein the one physical resource block pair contains n eREGs,

wherein the n value corresponding to the physical resource block with a normal cyclic prefix subframe is the same as the n value corresponding to the physical resource block with an extended cyclic prefix subframe;

or, the one physical resource block contains n eREGs, wherein the n value is determined according to a predefined scenario, wherein the predefined scenario comprises at least one of the following;

extended cyclic prefix configured general subframes, normal cyclic prefix configured general subframes, an extended cyclic prefix configured special subframe set 1, an extended cyclic prefix configured special subframe set 2, a normal cyclic prefix configured special subframe set 1, and a normal cyclic prefix configured special subframe set 2, and n is an integer greater than or equal to 1.

20. A device for sending enhanced Physical Downlink Control Channel (ePDCCH) applied to a base station, wherein the device for sending the ePDCCH comprises:

a first mapping component configured to map enhanced resource element groups (eREGs) corresponding to the ePDCCH to different resource elements, wherein each of the eREGs corresponding to the ePDCCH is located in one physical resource block pair, and the first mapping component comprises;

a second partitioning component configured to partition physical resource block pairs corresponding to the ePDCCH into eREGs, and a third mapping component configured to map the ePDCCH to predefined eREGs; and

a sending component configured to send the ePDCCH on the resource elements.

21. The device according to claim 20, wherein the second partitioning component comprises:

a numbering component configured to number resource elements used for the ePDCCH according to an order of a time domain first and then a frequency domain or an order of the frequency domain first and then the time domain; and

a third partitioning component configured to partition the numbered resource elements into eREGs.

22. The device according to claim 21, wherein the third partitioning component is configured to partition the numbered resource elements into eREGs by one of the following manners:

partitioning the numbered resource elements into the eREGs at equal intervals;

partitioning the numbered resource elements into the eREGs in a continuous manner according to the sequence of the numbered resource elements;

inputting the numbered resource elements into a subblock interleaver, and sequentially partitioning resource elements output from the subblock interleaver into the eREGs; and

inputting the numbered resource elements into a subblock interleaver, performing cyclic shift for resource elements output from the subblock interleaver, and then partitioning resource elements subjected to the cyclic shift into the eREGs.

23. The device according to claim 20, wherein

an initial time domain position of physical resources corresponding to the ePDCCH is the same as an initial time domain position of a physical downlink shared channel (PDSCH) scheduled by the ePDCCH, wherein the ePDCCH and the PDSCH are in a same serving cell.

24. The device according to claim 20, wherein the first mapping component is configured to map the eREGs corresponding to ePDCCH to different resource elements by the following manners:

mapping virtual eREGs to the eREGs, wherein the eREGs correspond to physical resources, and the virtual eREGs correspond to logical units of the ePDCCH; and

the virtual eREGs comprise continuous virtual eREGs and discrete virtual eREGs, wherein the continuous virtual eREGs are mapped to eREGs having the same serial numbers as the continuous virtual eREGs, and the discrete virtual eREGs are mapped to predefined eREGs.

25. The device according claim 24, wherein the first mapping component is configured to map the discrete virtual eREGs to the predefined eREGs by the following manners:

partitioning discrete eREGs into one or more discrete virtual eREG sets;

partitioning the eREGs into one or more eREG sets; and

setting the one or more discrete virtual eREG sets and the one or more eREG sets in a one-to-one correspondence, wherein the number of discrete virtual eREGs in each discrete virtual eREG set is equal to the number of eREGs in each eREG set.

26. The device according to claim 20, wherein the one physical resource block pair contains n eREGs,

wherein the n value corresponding to the physical resource block with a normal cyclic prefix subframe is the same as the n value corresponding to the physical resource block with an extended cyclic prefix subframe;

or, the one physical resource block contains n eREGs, wherein the n value is determined according to a predefined scenario, wherein the predefined scenario comprises at least one of the following;

extended cyclic prefix configured general subframes, normal cyclic prefix configured general subframes, an extended cyclic prefix configured special subframe set 1, an extended cyclic prefix configured special subframe set 2, a normal cyclic prefix configured special subframe set 1, and normal cyclic prefix configured special subframe set 2, and n is an integer greater than or equal to 1.

27. A base station comprising the device for sending the ePDCCH according to claim 20.

28. A device for receiving an enhanced Physical Downlink Control Channel (ePDCCH) applied to user equipment (UE), wherein the device for receiving the ePDCCH comprises:

a determination component configured to determine resource elements to which configured for determining corresponding to the ePDCCH are mapped, wherein each of the eREGs corresponding to the ePDCCH is located in one physical resource block pair; and

a receiving component configured to receive the ePDCCH on the resource elements.

29. User equipment (UE) comprising the device for receiving the ePDCCH according to claim 28.