Method for transmission of control channel signals

Patent metadata

Field	Value
Publication number	US-9647814-B2
Application number	US-201414538448-A
Country	US
Kind code	B2
Filing date	Nov 11, 2014
Priority date	May 11, 2012
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

The present invention relates to a method in a network control node for transmission of control channel signals in a wireless communication system, the wireless communication system employing scheduling of physical resource blocks (PRBs) used for each new transmission of a control channel signal, wherein each control channel signal is related to one or more control channel elements (CCEs); the method comprising the steps of: removing user specific reference signals in associated physical resource blocks (PRBs) if the associated physical resource blocks (PRBs) comprises at least one control channel signal; inserting control channel signals in the associated physical resource blocks (PRBs); and transmitting the associated physical resource blocks (PRBs). Furthermore, the invention also relates to a computer program, a computer program product, and a network control node device thereof.

First claim

What is claimed is:

1. A method in a network control node for transmission of control channel signals in a wireless communication system, said wireless communication system employing scheduling of physical resource blocks used for each new transmission of a control channel signal, wherein each control channel signal is related to one or more control channel elements (CCEs); said method comprising:
removing user specific reference signals in associated physical resource blocks if said associated physical resource blocks comprise at least one control channel signal;
inserting the at least one control channel signal in said associated physical resource blocks; and
transmitting said associated physical resource blocks;
wherein said user specific reference signals are channel state indication reference signals (CSI-RS);
wherein the removing the user specific reference signals further comprises:
removing only a part of said user specific reference signals in said associated physical resource blocks, wherein said part of said user specific reference signals are related to one user and is known to said one user only.

2. The method according to claim 1 , wherein detection of the control channel signals in said wireless communication system is performed in search spaces containing a set of candidate CCEs, said search spaces are a user specific search space or a common search space common to two or more users.

3. The method according to claim 2 , wherein
said user specific reference signals are removed in user specific search space only; or
said user specific reference signals are removed in common search space only; or
said user specific reference signals are removed in user specific search space and in common search space.

4. The method according to claim 1 , wherein at least one of the following situations occurs:
(a) said control channel signals correspond to an enhanced physical downlink control channels (ePDCCH); and
(b) said network control node does not support transmission of physical downlink control channels (PDCCH).

5. The method according to claim 1 , wherein said user specific reference signals are transmitted on a set of sub-carriers which do not carry any physical downlink control channel signals (PDCCHs).

6. The method according to claim 1 , wherein the removing the user specific reference signals further comprises:
removing said user specific reference signals in said associated physical resource blocks at an initial control channel communication stage.

7. The method according to claim 1 , wherein the removing the user specific reference signals further comprises:
removing all of said user specific reference signals in said associated physical resource blocks, wherein said all user specific reference signals are related to at least two users and is known to a user.

8. The method according to claim 1 , wherein positions for said user specific reference signals are not signalled to the user.

9. The method according to claim 1 , wherein the inserting the at least one control channel signal comprises:
inserting said at least one control channel signals by using pairs of resource elements (REs) in said associated physical resource blocks used for transmission of said control channel signals.

10. A network control node device arranged for transmission of control channel signals in a wireless communication system, said wireless communication system employing scheduling of physical resource blocks used for each new transmission of a control channel signal, wherein each control channel signal is related to one or more control channel elements (CCEs); said network control node device further being arranged to:
remove user specific reference signals in associated physical resource blocks if said associated physical resource blocks comprise at least one control channel signal;
insert the at least one control channel signal in said associated physical resource blocks; and
transmit said associated physical resource blocks;
wherein said user specific reference signals are channel state indication reference signals (CSI-RS);
wherein the removing the user specific reference signals further comprises:
removing only a part of said user specific reference signals in said associated physical resource blocks, wherein said part of said user specific reference signals are related to one user and is known to said one user only.

11. The network control node device according to claim 10 , wherein said network control node device is configured to remove all of said user specific reference signals in said associated physical resource blocks, wherein said all user specific reference signals are related to at least two users and is known to a user.

12. The network control node device according to claim 10 , wherein said network control node device is configured to insert said at least one control channel signal by using pairs of resource elements (REs) in said associated physical resource blocks used for transmission of said control channel signals.

13. The network control node device according to claim 10 , wherein detection of the control channel signals in said wireless communication system is performed in search spaces containing a set of candidate CCEs, said search spaces are a user specific search space or a common search space common to two or more users.

14. The network control node device according to claim 13 , wherein
said user specific reference signals are removed in user specific search space only; or
said user specific reference signals are removed in common search space only; or
said user specific reference signals are removed in user specific search space and in common search space.

15. The network control node device according to claim 10 , wherein at least one of the following situations occurs:
(a) said control channel signals correspond to an enhanced physical downlink control channels (ePDCCH); and
(b) said network control node does not support transmission of physical downlink control channels (PDCCH).

16. The network control node device according to claim 10 , wherein said user specific reference signals are transmitted on a set of sub-carriers which do not carry any physical downlink control channel signals (PDCCHs).

17. The network control node device according to claim 10 , wherein said network control node device is configured to remove said user specific reference signals in said associated physical resource blocks at an initial control channel communication stage.

18. A non-transitory computer program product, for transmission of control channel signals in a wireless communication system, said wireless communication system employing scheduling of physical resource blocks (PRBs) used for each new transmission of a control channel signal, wherein each control channel signal is related to one or more control channel elements (CCEs), said computer program product, when executed by a processor, will cause the processor to:
remove user specific reference signals in associated physical resource blocks if said associated physical resource blocks comprise at least one control channel signal;
insert the at least one control channel signal in said associated physical resource blocks; and
transmit said associated physical resource blocks;
wherein said user specific reference signals are channel state indication reference signals (CSI-RS);
wherein when removing the user specific reference signal, the processor is further caused to implement:
removing only a part of said user specific reference signals in said associated phys

Assignees

• Huawei Tech Co Ltd

Inventors

• Robert Safavi Anahid
• Popovic Branislav
• Berggren Fredrik

Classifications

• H04L5/0051 Primary

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L5/008

  once only, on installation · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title