METHODS AND NODES IN A WIRELESS COMMUNICATION SYSTEM

• US 20150155993A1
• Filed: 02/10/2015
• Published: 06/04/2015
• Est. Priority Date: 08/10/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Berggren, Fredrik, Classon, Brian
• Granted Patent: US 10,164,751 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal

Abstract

Methods and nodes are provided for transmission of information, over at least one antenna port, in a subframe, which information is received by a receiver in a wireless communication system. Demodulation of the information entity by the receiver is enabled by also transmitting a Demodulation Reference Signal, DM-RS, comprising a DM-RS pattern, wherein positions in the DM-RS pattern are associated with at least one antenna port for transmission of the information entity. The method includes defining, for at least one subframe, a set of at least two distinct DM-RS patterns, assigning one DM-RS pattern, from the defined set of DM-RS patterns, to the receiver, and transmitting the information entity on the at least one antenna port associated with the assigned DM-RS pattern.

Claims

1. A method in a radio network node for transmission of an information entity, over at least one antenna port, in a subframe comprising a plurality of time-frequency resources, which information entity is to be received by a receiver in a wireless communication system, wherein demodulation of the information entity by the receiver is enabled by also transmitting a Demodulation Reference Signal (DM-RS) comprising a DM-RS pattern comprising a set of positions of the plurality of time-frequency resources, wherein the positions in the DM-RS pattern are associated with at least one antenna port for transmission of the information entity, the method comprising:

defining, for at least one subframe, a set of at least two distinct DM-RS patterns;

assigning one DM-RS pattern, from the defined set of DM-RS patterns, to the receiver;

transmitting the information entity on the at least one antenna port associated with the assigned DM-RS pattern.

2. The method according to claim 1, wherein the assigned DM-RS pattern is receiver-specific, such that, for the at least one subframe, different DM-RS patterns are assignable to different receivers.

3. The method according to claim 1, wherein the assigned DM-RS pattern is cell-specific, such that, for the at least one subframe, the same DM-RS patterns are assignable to different receivers.

4. The method according to claim 3, wherein the assigned DM-RS pattern is cell-specific and determined by type of reference signals transmitted on that carrier.

5. The method according to claim 1, wherein different sets of DM-RS patterns are defined on different cells served by the radio network node, for a receiver in a multi carrier scenario such that a union of the different sets of the different carriers comprises at least two distinct DM-RS patterns.

6. The method according to claim 1, wherein the DM-RS pattern is assigned to the receiver based on a predefined rule.

7. The method according to claim 1, wherein:

the wireless communication system is a Long Term Evolution (LTE) system;

the receiver is a User Equipment (UE); and

the radio network node is an evolved NodeB (eNodeB).

8. A method in a receiver for reception of an information entity, over at least one antenna port, in a subframe comprising a plurality of time-frequency resources, which information entity is transmitted by a radio network node in a wireless communication system, wherein demodulation of the information entity is enabled by also receiving a Demodulation Reference Signal (DM-RS) comprising a DM-RS pattern comprising a set of positions of said time-frequency resources, wherein the positions in the DM-RS pattern are associated with at least one antenna port for reception of the information entity, the method comprising:

acquiring information related to a DM-RS pattern to be utilized for channel estimation; and

receiving the information entity from the radio network node on an antenna port associated with the DM-RS pattern to be utilized for channel estimation.

9. The method according to claim 8, wherein the DM-RS pattern is receiver-specific, such that, for the at least one subframe, different DM-RS patterns are acquirable for different receivers.

10. The method according to claim 8, wherein the DM-RS pattern is cell-specific, such that, for the at least one subframe, the same DM-RS patterns are assignable to different receivers.

11. The method according to claim 8, wherein the DM-RS pattern is cell-specific, based on carrier type determined by type of reference signals transmitted on that carrier.

12. The method according to claim 8, wherein the DM-RS pattern to be utilized for channel estimation is based on a predefined rule.

13. The method according to claim 8, wherein:

the wireless communication system is a Long Term Evolution (LTE) system;

the receiver is a User Equipment (UE); and

the radio network node is an evolved NodeB (eNodeB).

14. A receiver, configured for reception of an information entity, over at least one antenna port, in a subframe comprising a plurality of time-frequency resources, which information entity is transmitted by a radio network node in a wireless communication system, wherein demodulation of the information entity is enabled by also receiving a Demodulation Reference Signal (DM-RS) comprising a DM-RS pattern comprising a set of positions of said time-frequency resources, wherein the positions in the DM-RS pattern are associated with at least one antenna port for reception of the information entity, the receiver comprising:

a processing circuit, configured for acquiring information related to a DM-RS pattern to be utilized for channel estimation; and

a receiving unit, configured for receiving the information entity from the radio network node on an antenna port associated with the acquired DM-RS pattern.