REFERENCE SIGNALS AND COMMON SEARCH SPACE FOR ENHANCED CONTROL CHANNELS

• US 20170171847A1
• Filed: 02/28/2017
• Published: 06/15/2017
• Est. Priority Date: 05/03/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PAPASAKELLARIOU, Aris, JI, Hyoung-Ju
• Granted Patent: US 10,477,529 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0232 by interpolation between sounding signals
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• 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 72/51 based on terminal or device properties

Abstract

Methods and apparatuses for a User Equipment (UE) to receive signaling of UE-common Downlink Control Information (DCI) in a set of Physical Resource Blocks (PRBs) over a Transmission Time Interval (TTI) are provided. The UE demodulates UE-common DCI using a Reference Signal (RS) that is scrambled by a UE-common scrambling sequence. The UE may assume that RS having a same precoding is transmitted in the set of PRBs over different TTIs. The UE may determine the scrambling sequence implicitly from an identity of a point transmitting the UE-common DCI or explicitly by higher layer signaling. The UE may determine the PRBs of UE-common DCI transmission by broadcast signaling or by higher layer signaling.

Claims

1. A method for receiving reference signals (RSs) by a user equipment (UE), the method comprising:

receiving at least one broadcast signal from a base station;

determining a location in a downlink bandwidth for each physical resource block (PRB) in a set of PRBs for reception of physical downlink control channels (PDCCHs) based on the at least one broadcast signal; and

receiving RSs in the set of PRBs based on the location over a plurality of subframes.

2. The method of claim 1, wherein the at least one broadcast signal comprises an information element indicating the location.

3. The method of claim 1, wherein determining the location in the downlink bandwidth comprises:

determining a physical identity of the base station from a first broadcast signal;

determining the downlink bandwidth from a second broadcast signal; and

determining the location in the downlink bandwidth based on the physical identity of the base station and the downlink bandwidth.

4. The method of claim 1, further comprising:

receiving a PDCCH in the set of PRBs over predetermined subframes in a set of subframes.

5. The method of claim 4, wherein the PDCCH conveys a downlink control information (DCI) format that includes cyclic redundancy check (CRC) bits scrambled with a radio network temporary identifier (RNTI), and

wherein the RNTI is one of a paging RNTI, a random access RNTI, a system information RNTI, a cell RNTI, and a semi-persistent scheduling (SPS) RNTI.

6. A user equipment (UE) apparatus for receiving reference signals (RSs), the apparatus comprising:

a receiver configured to receive at least one broadcast signal from a base station and to receive RSs in a set of physical resource blocks (PRBs) over a plurality of subframes; and

a processor configured to;

determine a location in a downlink bandwidth for each PRB in the set of PRBs for reception of physical downlink control channels (PDCCHs) based on the at least one broadcast signal, and

control to receive the RSs in the set of PRBs based on the location over the plurality of subframes.

7. The UE apparatus of claim 6, wherein the at least one broadcast signal comprises an information element indicating the location.

8. The UE apparatus of claim 6, wherein the processor is further configured to determine a physical identity of the base station from a first broadcast signal, determine the downlink bandwidth from a second broadcast signal, and determine the location in the downlink bandwidth based on the physical identity of the base station and the downlink bandwidth.

9. The UE apparatus of claim 6, wherein the processor is further configured to control to receive a PDCCH in the set of PRBs over predetermined subframes in a set of subframes.

10. The UE apparatus of claim 9, wherein the PDCCH conveys a downlink control information (DCI) format that includes cyclic redundancy check (CRC) bits scrambled with a radio network temporary identifier (RNTI), and

wherein the RNTI is one of a paging RNTI, a random access RNTI, a system information RNTI, a cell RNTI, and a semi-persistent scheduling (SPS) RNTI.

11. A method for transmitting reference signals (RSs) by a base station, the method comprising:

transmitting at least one broadcast signal to a user equipment (UE);

determining a location in a downlink bandwidth for each physical resource block (PRB) in a set of PRBs for reception of physical downlink control channels (PDCCHs) based on the at least one broadcast signal; and

transmitting RSs in the set of PRBs based on the location over a plurality of subframes.

12. The method of claim 11, wherein the at least one broadcast signal comprises an information element indicating the location.

13. The method of claim 11, wherein determining the location in the downlink bandwidth comprises:

determining a physical identity of the base station from a first broadcast signal;

determining the downlink bandwidth from a second broadcast signal; and

determining the location in the downlink bandwidth based on the physical identity of the base station and the downlink bandwidth.

14. The method of claim 11, further comprising:

transmitting a PDCCH in the set of PRBs over predetermined subframes in a set of subframes.

15. The method of claim 14, wherein the PDCCH conveys a downlink control information (DCI) format that includes cyclic redundancy check (CRC) bits scrambled with a radio network temporary identifier (RNTI), and

wherein the RNTI is one of a paging RNTI, a random access RNTI, a system information RNTI, a cell RNTI, and a semi-persistent scheduling (SPS) RNTI.

16. A base station (BS) apparatus for transmitting reference signals (RSs), the apparatus comprising:

a transmitter configured to transmit at least one broadcast signal from a base station and to transmit RSs in a set of physical resource block (PRB)s over a plurality of subframes; and

a processor configured to;

determine a location in a downlink bandwidth for each PRB in the set of PRBs for reception of physical downlink control channels (PDCCHs) based on the at least one broadcast signal, and

control to transmit the RSs in the set of PRBs based on the location over the plurality of subframes.

17. The BS apparatus of claim 16, wherein the at least one broadcast signal comprises an information element indicating the location.

18. The BS apparatus of claim 16, wherein the processor is further configured to determine a physical identity of the base station from a first broadcast signal, determine the downlink bandwidth from a second broadcast signal, and determine the location in the downlink bandwidth based on the physical identity of the base station and the downlink bandwidth.

19. The BS apparatus of claim 16, wherein the processor is further configured to control to transmit a PDCCH in the set of PRBs over predetermined subframes in a set of subframes.

20. The BS apparatus of claim 19, wherein the PDCCH conveys a downlink control information (DCI) format that includes cyclic redundancy check (CRC) bits scrambled with a radio network temporary identifier (RNTI), and

wherein the RNTI is one of a paging RNTI, a random access RNTI, a system information RNTI, a cell RNTI, and a semi-persistent scheduling (SPS) RNTI.