Apparatus and method for estimating channel

• US 10,193,680 B2
• Filed: 08/15/2016
• Issued: 01/29/2019
• Est. Priority Date: 11/07/2011
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Yoon, Sungjun
• Primary Examiner(s): Sloms, Nicholas
• Application Number:
  US15/236,835
• Publication Number:
  US 20160352489A1
• Time in Patent Office: 897 Days
• Field of Search: None
• CPC Class Codes: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A method for transmitting a reference signal includes selecting one of a first initialization value and a second initialization value, generating selection instruction information corresponding to the selected initialization value, transmitting the selection instruction information to a mobile station, generating a reference signal based on the selected initialization value, and transmitting the generated reference signal to the mobile station. A method for estimating a channel includes receiving selection instruction information indicating a selection of at least one of a first initialization value and a second initialization value, receiving a first reference signal based on the selection instruction information, generating a second reference signal based on an initialization value indicated as being selected by the selection instruction information, and estimating a channel state by comparing the first reference signal with the second reference signal.

Claims

1. A method for transmitting a reference signal, comprising:

configuring first initialization value generation information associated with a first value of scrambling code identity (SCID) (n_SCID) information and second initialization value generation information associated with a second value of the SCID (n_SCID) information, wherein the first initialization value generation information and the second initialization value generation information comprise respective cell identity (cell ID) information, wherein the respective cell ID information is selected based on the SCID (n_SCID) information;

transmitting, to a user equipment (UE), the first initialization value generation information and the second initialization value generation information through a higher layer signaling;

transmitting, to the UE, the SCID (n_SCID) information as selection indication information;

generating a reference signal for the UE based on one of a first initialization value and a second initialization value selected by the SCID (n_SCID) information, the first initialization value being determined based on the first initialization value generation information and the second initialization value being determined based on the second initialization value generation information; and

transmitting the generated reference signal to the UE.

2. The method of claim 1, wherein the higher layer signaling corresponds to a radio resource control (RRC) signaling.

3. The method of claim 1, wherein the SCID (n_SCID) information is included in downlink control information (DCI).

4. The method of claim 1, wherein the SCID (n_SCID) information corresponds to a SCID value included in 3-bit information representing antenna port(s), a scrambling identity, and a number of layers.

13. The method of claim 1, wherein at least one of the first initialization value generation information and the second initialization value generation information comprise a parameter related to a channel state information reference signal (CSI-RS).

14. The method of claim 3, wherein the DCI is in DCI format 2C.

5. A method of operating a user equipment (UE), comprising:

receiving, from a base station (BS), a first reference signal;

receiving first initialization value generation information associated with a first value of scrambling code identity (SCID) (n_SCID) information and second initialization value generation information associated with a second value of the SCID (n_SCID) information through a higher layer signaling, wherein the first initialization value generation information and the second initialization value generation information comprise respective cell identity (cell ID) information, wherein the respective cell ID information is selected based on the SCID (n_SCID) information;

receiving the SCID (n_SCID) information as selection indication information;

generating a second reference signal based on one of a first initialization value and a second initialization value indicated by the SCID (n_SCID) information, the first initialization value being determined based on the first initialization value generation information and the second initialization value being determined based on the second initialization value generation information; and

estimating a channel state by comparing the second reference signal with the first reference signal.

6. The method of claim 5, wherein the higher layer signaling corresponds to a radio resource control (RRC) signaling.

7. The method of claim 5, wherein the SCID (n_SCID) information is included in downlink control information (DCI).

8. The method of claim 5, wherein the SCID (n_SCID) information corresponds to a SCID value included in 3-bit information representing antenna port(s), a scrambling identity, and a number of layers.

15. The method of claim 5, wherein at least one of the first initialization value generation information and the second initialization value generation information comprise a parameter related to a channel state information reference signal (CSI-RS).

16. The method of claim 7, wherein the DCI is in DCI format 2C.

9. A user equipment (UE) configured for receiving a reference signal, comprising:

one or more receivers;

a processor coupled to the one or more receivers, wherein the processor is configured to cause the UE to;

receive a first reference signal generated for the UE;

receive first initialization value generation information associated with a first value of scrambling code identity (SCID) (n_SCID) information and second initialization value generation information associated with a second value of the SCID (n_SCID) information through a higher layer signaling, wherein the first initialization value generation information and the second initialization value generation information comprise respective cell identity (cell ID) information, wherein the respective cell ID information is selected based on the SCID (n_SCID) information;

receive the SCID (n_SCID) information as selection indication information;

generate a second reference signal based on one of a first initialization value and a second initialization value indicated by the SCID (n_SCID) information, the first initialization value being determined based on the first initialization value generation information and the second initialization value being determined based on the second initialization value generation information; and

estimate a channel state by comparing the second reference signal with the first reference signal.

10. The UE of claim 9, wherein the higher layer signaling corresponds to a radio resource control (RRC) signaling.

11. The UE of claim 9, wherein the SCID (n_SCID) information is included in downlink control information (DCI).

12. The UE of claim 9, wherein the SCID (n_SCID) information corresponds to a SCID value included in 3-bit information representing antenna port(s), a scrambling identity, and a number of layers.

17. The UE of claim 9, wherein at least one of the first initialization value generation information and the second initialization value generation information comprise a parameter related to a channel state information reference signal (CSI-RS).

18. The UE of claim 11, wherein the DCI is in DCI format 2C.