Search space configuration for new radio (nr) system

Patent metadata

Field	Value
Publication number	US-2018227074-A1
Application number	US-201815887821-A
Country	US
Kind code	A1
Filing date	Feb 2, 2018
Priority date	Feb 6, 2017
Publication date	Aug 9, 2018
Grant date	—

Abstract

Methods, systems, and devices for wireless communication are described a search space configuration. A set of physical resource blocks (PRBs) or resource element groups (REGs) may be configured over two or more modulation symbols. A control channel element (CCE), or fixed set of REGs, may be formed using REGs in one modulation symbol. A search space, or set of decoding candidates, may be configured for one user equipment (UE) or multiple UEs. Search spaces for different UEs may share some CCEs. A decoding candidate for a UE may occupy a set of CCEs; the UE may make decoding to attempts on the set of CCEs. A base station may transmit in a subset of decoding candidates configured for the UE. A demodulation reference signal (DMRS) may be transmitted when a decoding candidate is used, and DMRS may not be transmitted when a decoding candidate is not used.

First claim

What is claimed is:

1 . A method for wireless communication, comprising:
configuring a user equipment (UE) to monitor a first set of decoding candidates in a first control symbol period of a slot, wherein each decoding candidate in the first set corresponds to at least one control channel element in the first control symbol period; configuring the UE to monitor a second set of decoding candidates in the second control symbol period of the slot, wherein each decoding candidate in the second set corresponds to at least one control channel element in the second control symbol period, and wherein a decoding candidate in the second set is aligned in the frequency domain with a decoding candidate in the first set; and transmitting control signaling within a control resource set for the UE in the slot in a control channel element corresponding to one or more decoding candidates of the first set of decoding candidates, one or more decoding candidates of the second set of decoding candidates, or both.

2 . The method of claim 1 , wherein the second set of decoding candidates comprises a repetition of an arrangement of the first set of decoding candidates such that decoding candidates for the UE in the second set are frequency-aligned with decoding candidates in the first set.

3 . The method of claim 2 , wherein the decoding candidates are defined by one or more aggregation levels in a search space comprising a first set of control channel elements in the first control symbol period and a second set of control channel elements in the second control symbol period.

4 . The method of claim 1 , wherein the first set of decoding candidates and the second set of decoding candidates occupy a same set of frequency resources.

5 . The method of claim 1 , further comprising:
transmitting a demodulation reference signal (DMRS) in a first decoding candidate of the first set of decoding candidates during the first control symbol period, wherein the DMRS transmitted in a first decoding candidate of the first set aids in decoding a second decoding candidate of the second set of decoding candidates that is frequency-aligned with the first decoding candidate.

6 . The method of claim 5 , further comprising:
transmitting a grant of resources for the UE in a control channel element of the first control symbol period corresponding to the first decoding candidate; and determining to leave empty a control channel element of the second control symbol period corresponding to the second decoding candidate.

7 . The method of claim 1 , further comprising:
transmitting a demodulation reference signal (DMRS) in a first decoding candidate of the first set of decoding candidates during the first control symbol period; transmitting, in the second control symbol period, a separate DMRS in a second decoding candidate of the second set of decoding candidates, wherein the DMRS transmitted during each of the first and second control symbol periods has a same pattern.

8 . The method of claim 7 , further comprising:
transmitting a first grant of resources for the UE in a control channel element of the first control symbol period corresponding to the first decoding candidate and a second grant of resources for the first UE in a control channel element of the second control symbol corresponding to the second decoding candidate.

9 . The method of claim 1 , further comprising:
concatenating control channel elements with a first aggregation level in the first control symbol period corresponding to a first decoding candidate of the first second of decoding candidates and control channel elements with a second aggregation level in the second control symbol period corresponding to a second decoding candidate of the second set of decoding candidates to form a third decoding candidate with a third aggregation level, wherein the third aggregation level is greater than the first aggregation level and the second aggregation level.

10 . The method of claim 9 , further comprising:
determining that the control resource set for the UE is less than a minimum bandwidth for the third aggregation level, wherein the first and second aggregation levels are concatenated based at least in part on the determination.

11 . The method of claim 1 , further comprising:
configuring the control resource set with a first set of control channel elements during the first control symbol period of the slot; and configuring the control resource set with a second set of control channel elements during the second control symbol period of the slot, wherein at least one boundary of the first set of control channel elements is aligned in the frequency domain with at least one boundary of the second set of control channel elements.

12 . The method of claim 11 , further comprising:
transmitting an indication of whether a demodulation reference signal (DMRS) is present during the second control symbol period, wherein the configuration of the control resource set during the second control symbol period is based at least in part on whether DMRS is present during the second control symbol period.

13 . The method of claim 11 , further comprising:
transmitting an indication of whether beamforming or phase continuity, or both, are maintained between the first control symbol period and the second control symbol period, wherein the configuration of the control resource set during the second control symbol period is based at least in part on whether beamforming or phase continuity is maintained.

14 . A method for wireless communication, comprising:
monitoring a first set of decoding candidates within a control resource set of the UE during a first control symbol period; monitoring a second set of decoding candidates within the control resource set during a second control symbol period, wherein a decoding candidate of the first set is aligned in the frequency domain with a decoding candidate of the second set; and communicating based at least in part on monitoring the first and second sets of decoding candidates.

15 . The method of claim 14 , wherein the second set of decoding candidates comprises a repetition of an arrangement of the first set of decoding candidates such that decoding candidates in the second set are frequency-aligned with decoding candidates in the first set.

16 . The method of claim 14 , wherein the first set of decoding candidates and the second set of decoding candidates occupy a same set of frequency resources.

17 . The method of claim 14 , further comprising:
receiving a demodulation reference signal (DMRS) in a first decoding candidate of the first set during the first control symbol period.

18 . The method of claim 17 , further comprising:
receiving the DMRS in a second decoding candidate of the second set during the second control symbol period, wherein the DMRS received in the first control symbol period has a same pattern as the DMRS received in the second control symbol period.

19 . The method of claim 18 , further comprising:
receiving a first grant of resources for the UE in the first decoding candidate and a second grant of resource for the UE in the second decoding candidate.

20 . The method of claim 19 , wherein the first grant comprises an assignment of resources in the slot and the second grant comprises an assignment of resources in a subsequent slot.

21 . The method of claim 14 , further comprising:
determining that control channel elements from a first aggregation level of a first decoding cand

Assignees

• Qualcomm Inc

Inventors

• Sun Jing
• Chen Wanshi
• Gaal Peter
• Yang Yang
• Lee Heechoon

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L1/0038

  Blind format detection (for detection of modulation format H04L27/0012) · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L1/0072

  Error control for data other than payload data, e.g. control data · CPC title

• H04L1/0046

  Code rate detection or code type detection (H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091) · CPC title