Transmission and Reception of Reference Signals in Wireless Networks

• US 20150289264A1
• Filed: 11/13/2012
• Published: 10/08/2015
• Est. Priority Date: 11/13/2012
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Sandberg, Sara, Baldemair, Robert, Sorrentino, Stefano
• Granted Patent: US 10,004,067 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems

Abstract

The enclosed embodiments relate to transmission and reception of reference signals on sub-carriers of a time frequency grid in a wireless network. Resource configuration for transmission of reference signals is obtained by a wireless device. A reference signal received power, RSRP, reference signal, RSRP-RS, is transmitted by the wireless device according to the resource configuration. The RSRP-RS is mapped to every J:th sub-carrier, where J>2. The RSRP-RS is received by a network node.

Claims

1. A method of transmitting reference signals on sub-carriers of a time frequency grid in a wireless network, the method being performed by a wireless device, comprising:

obtaining resource configuration for transmission of reference signals; and

transmitting a reference signal received power, RSRP, reference signal, RSRP-RS, according to said resource configuration;

wherein the RSRP-RS is mapped to every J;

th sub-carrier, where J>

2.

2. The method according to claim 1, further comprising

determining an uplink transmit power for the RSRP-RS based on at least one of downlink path loss estimates determined by the wireless device for at least two transceiver points or uplink absolute path loss estimates performed by the network node.

3. The method according to claim 1, wherein the RSRP-RS is transmitted in a last symbol of a subframe.

4. The method according to claim 1, wherein other signals or channels scheduled in the same subframe as the RSRP-RS are rate matched, punctured, or cancelled.

5. The method according to claim 1, wherein a plurality of sub-carriers are not used for transmitting the RSRP-RS.

6. The method according to claim 1, wherein said sub-carriers selected for transmission of the RSRP-RS are assigned according to a pseudo-random sequence, the method further comprising

receiving initialization of the pseudo-random sequence from the network node.

7. The method according to claim 6, wherein the pseudo-random sequence is a function of time and relates to a shift of a starting carrier of the J:

th sub-carrier.

8. The method according to claim 1, wherein said resource configuration relates to a semi-static configuration of said grid on which the RSRP-RS is to occur.

9. The method according to claim 1, wherein said resource configuration determines the RSRP-RS to be transmitted periodically, aperiodically, or upon request from a network node.

10. A method of receiving reference signals on sub-carriers of a time frequency grid in a wireless network, the method being performed by a network node, comprising:

receiving a reference signal received power, RSRP, reference signal, RSRP-RS, for uplink measurements from a wireless device, wherein the RSRP-RS is mapped to every J;

th sub-carrier, where J>

2.

11. The method according to claim 10, further comprising

transmitting a RSRP-RS report based on said RSRP-RS to a coordinating network node or a serving network node.

12. The method according to claim 10 or 11, further comprising

providing resource configuration for transmission of reference signals to said wireless device, and wherein said received RSRP-RS is by said wireless device transmitted according to said resource configuration.

13. The method according to any one of claim 10, further comprising

estimating the transmit power of the wireless device based on the RSRP-RS relating to transmission from the wireless device to a transceiver point.

14. The method according to claim 13, further comprising

determining an absolute path loss value based on said RSRP-RS from the wireless device to said transceiver point.

15. The method according to any one of claim 10, the method further comprising

providing at least one further network node with information regarding said resource configuration and/or an RSRP-RS report based on the absolute path loss value.

16. The method according to claim 10, wherein the network node is a coordinating network node, the method further comprising

providing at least one network node, with information relating to a semi-static configuration of said grid on which the RSRP-RS is to occur.

17. The method according to claim 10, further comprising

measuring noise based on a plurality of sub-carriers not being used for transmitting the RSRP-RS.

18. A wireless device for transmission of reference signals on sub-carriers of a time frequency grid in a wireless network, comprising:

a receiver arranged to obtain resource configuration for transmission of reference signals; and

a transmitter arranged to transmit a reference signal received power, RSRP, reference signal, RSRP-RS, according to said resource configuration;

wherein the RSRP-RS is mapped to every J;

th sub-carrier, where J>

2.

20. A wireless network for transmission and reception of reference signals on sub-carriers of a time frequency grid in the wireless network, comprising:

at least one wireless device according to claim 18.

19. A network node for reception of reference signals on sub-carriers of a time frequency grid in a wireless network, comprising:

a receiver arranged to receive a reference signal received power, RSRP, reference signal, RSRP-RS, for uplink measurements from a wireless device, wherein the RSRP-RS is mapped to every J;

th sub-carrier, where J>

2.

24. A wireless network for transmission and reception of reference signals on sub-carriers of a time frequency grid in the wireless network, comprising:

at least one network node according to claim 19.

21. A computer program for transmission of reference signals on sub-carriers of a time frequency grid in a wireless network, the computer program comprising computer program code which, when run on a wireless device, causes the wireless device to:

obtain resource configuration for transmission of reference signals; and

transmit a reference signal received power, RSRP, reference signal, RSRP-RS, according to said resource configuration;

wherein the RSRP-RS is mapped to every J;

th sub-carrier, where J>

2.

23. A computer program product comprising a computer program according to claim 21 and a non-volatile computer readable means on which the computer program is stored.

22. A computer program for reception of reference signals on sub-carriers of a time frequency grid in a wireless network, the computer program comprising computer program code which, when run on a network node, causes the network node to:

receive a reference signal received power, RSRP, reference signal, RSRP-RS, for uplink measurements from a wireless device, wherein the RSRP-RS is mapped to every J;

th sub-carrier, where J>

2.