Methods and arrangements in a mobile telecommunication network

• US 8,447,343 B2
• Filed: 09/29/2010
• Issued: 05/21/2013
• Est. Priority Date: 10/05/2009
• Status: Active Grant

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Gerstenberger, Dirk, Larsson, Daniel, Lindbom, Lars
• Primary Examiner(s): Safaipour, Bobbak
• Application Number:
  US12/893,383
• Publication Number:
  US 20110081927A1
• Time in Patent Office: 965 Days
• Field of Search: 455/522, 370/318, 370/328, 370/329, 370/248, 370/315
• US Class Current: 455/522
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The present invention relates to methods and arrangements for assisting a User Equipment (UE) to determine transmit power to be used on a first uplink component carrier y, wherein the base station is configured to communicate with the UE over a plurality of uplink and downlink component carriers x,y. The UE is aware of path loss parameters associated with a second downlink component carrier x. The method in a base station comprises determining cell specific path loss parameters associated with the component carriers of the base station. The cell specific path loss parameters at least comprises path loss parameters associated with the first uplink component carrier y and a second uplink component carrier x which is paired to the second downlink component carrier x, wherein the second uplink component carrier and second downlink component carrier are within one frequency band. The method comprises the further steps of calculating a pathloss offset, deltaPL(y,x), for the first uplink component carrier y, wherein the pathloss offset deltaPL(y,x) is the pathloss power offset for the first uplink component carrier y with respect to the second uplink component carrier x, and sending the calculated pathloss offset, deltaPL(y,x) to the UE.

Claims

1. A method in a base station for assisting a User Equipment, UE, to determine transmit power to be used on a first uplink component carrier y, wherein the base station is configured to communicate with the UE over a plurality of uplink and downlink component carriers x,y, and the UE is aware of path loss parameters associated with a second downlink component carrier x, the method comprising:

determining cell specific path loss parameters associated with the component carriers of the base station, wherein the cell specific path loss parameters at least comprises path loss parameters associated with the first uplink component carrier y and a second uplink component carrier x which is paired to the second downlink component carrier x, wherein the second uplink component carrier and second downlink component carrier are within one frequency band,

calculating a pathloss offset, deltaPL(y,x), for the first uplink component carrier y, wherein the pathloss offset deltaPL(y,x) is the pathloss power offset for the first uplink component carrier y with respect to the second uplink component carrier x, and

sending the calculated pathloss offset, deltaPL(y,x) to the UE.

2. The method according to claim 1, wherein the second downlink component carrier x is an anchor downlink component carrier.

3. The method according to claim 1, wherein the method further comprising:

receiving measurements from the UE, and

determining path loss parameters associated with the first and second component carriers based on the received measurements.

4. The method according to claim 3, wherein the received measurements are Reference Signal Received Power measurements.

5. The method according to claim 1, wherein the first uplink component carrier y is used for one of Physical Uplink Control Channel, PUCCH, Physical Uplink Shared Channel, PUSCH, Sounding Reference Signals, SRS, and Physical Random Access Channel, PRACH.

6. A method in a User Equipment, UE to determine UE transmit power to be used on a first uplink component carrier y, wherein the UE is configured to communicate with a base station over a plurality of uplink and downlink component carriers x,y, the method comprising:

determining path loss parameters of a second downlink component carrier x,

receiving a pathloss offset, deltaPL(y,x), wherein the deltaPL(y,x) is the pathloss power offset for the first uplink component carrier y with respect to a second uplink component carrier x which is paired to the second downlink component carrier x, wherein the second uplink component carrier and second downlink component carrier are within one frequency band, and

using the received pathloss offset deltaPL(x,y) and the determined path loss parameters of the second downlink component carrier x for calculating the transmit power to be used on the first uplink component carrier y.

7. The method according to claim 6, wherein the method further comprising sending measurements to the base station to be used for determining path loss parameters.

8. The method according to claim 7, wherein the received measurements are Reference Signal Received Power measurements.

9. The method according to claim 6, wherein the second downlink component carrier x is an anchor downlink component carrier.

10. The method according to claim 6, wherein the first uplink component carrier y is used for one of Physical Uplink Control Channel, PUCCH, Physical Uplink Shared Channel, PUSCH, Sounding Reference Signals, SRS, and Physical Random Access Channel, PRACH.

11. A base station for assisting a User Equipment, UE, to determine transmit power to be used on a first uplink component carrier y, wherein the base station is configured to communicate with the UE over a plurality of uplink and downlink component carriers x,y, and the UE is aware of path loss parameters associated with a second downlink component carrier x, wherein the base station comprises a processor configured to determine cell specific path loss parameters associated with the component carriers of the base station, wherein the cell specific path loss parameters at least comprises path loss parameters associated with the first uplink component carrier and a second uplink component carrier x which is paired to the second downlink component carrier x, wherein the second uplink component carrier and second downlink component carrier are within one frequency band, to calculate a pathloss offset, deltaPL(y,x), for the first uplink component carrier y, wherein the pathloss offset deltaPL(y,x) is the pathloss power offset for the first uplink component carrier y with respect to the second uplink component carrier x, and a transmitter configured to send the calculated pathloss offset, deltaPL(y,x) to the UE.

12. The base station according to claim 11, wherein the second downlink component carrier x is an anchor downlink component carrier.

13. The base station according to claim 11, wherein the base station further comprises a receiver configured to receive measurements from the UE, and wherein the processor is further configured to determine path loss parameters associated with the first and second component carriers based on the received measurements.

14. The base station according to claim 11, wherein the first uplink component carrier y is used for one of Physical Uplink Control Channel, PUCCH, Physical Uplink Shared Channel, PUSCH, Sounding Reference Signals, SRS, and Physical Random Access Channel, PRACH.

15. A User Equipment, UE for determining UE transmit power to be used on a first uplink component carrier y, wherein the UE is configured to communicate with a base station over a plurality of uplink and downlink component carriers x,y, the UE comprises a processor configured to determine path loss parameters of a second downlink component carrier x, a receiver configured to receive a pathloss offset, deltaPL(y,x), wherein the deltaPL(y,x) is the pathloss power offset for the first uplink component carrier y with respect to a second uplink component carrier x which is paired to the second downlink component carrier x, wherein the second uplink component carrier and second downlink component carrier are within one frequency band, and the processor is further configured to use the received pathloss offset deltaPL(x,y) and the determined path loss parameters of the second downlink component carrier x for calculating the transmit power to be used on the uplink component carrier y.

16. The UE according to claim 15, wherein the UE further comprises a transmitter configured to send RSRP measurements to the base station to be used for determining path loss parameters.

17. The UE according to claim 15, wherein the second downlink component carrier x is an anchor downlink component carrier.

18. The UE according to claim 15, wherein the first uplink component carrier y is used for one of Physical Uplink Control Channel, PUCCH, Physical Uplink Shared Channel, PUSCH, Sounding Reference Signals, SRS, and Physical Random Access Channel, PRACH.