TIMING OF COMPONENT CARRIERS IN MULTI-CARRIER WIRELESS NETWORKS

• US 20110111785A1
• Filed: 09/03/2008
• Published: 05/12/2011
• Est. Priority Date: 03/25/2008
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Parkall, Stefan, Dahlman, Erik, Lindoff, Bengt
• Granted Patent: US 8,676,240 B2
• Time in Patent Office: Days
• US Class Current: 455/513
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 40/16 based on interference
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Mechanisms for efficient transmission of large amount of download data from a base station (210) to a user equipment (220) in a multi-carrier that minimizes power consumption on the user equipment are described. When multiple component carriers are to be used to transmit the download data, the base station (210) informs the user equipment (220). The base station (210) transmits on the anchor carriers without wait after informing the user equipment (220) and transmits on the non-anchor carriers after waiting a predetermined delay. The predetermined delay provides time to allow the user equipment (220) to activate the receiving resources and be ready to receive the download data over the non-anchor carriers. In this manner, the user equipment (220) can be in a power conservation mode and activate the receiver resources only when needed.

Claims

1. A method for operating a base station (210) of a wireless network (200), comprising:

establishing (A410) a connection over one or more anchor carriers including a first carrier, wherein the anchor carriers are used to provide control signals from the base station (210) to a user equipment (210);

making a determination (A420) as to whether the DL data destined to the user equipment (220) should be additionally transferred over a second carrier; and

transmitting (A430) the DL data over the first and second carriers when it is determined that the second carrier should be additionally used.

wherein there is a predetermined delay between the transmission over the first and second carriers.

2. The method of claim 1, wherein the second carrier is not one of the anchor carriers.

3. The method of claim 1, wherein the predetermined delay is an amount of time sufficient for the user equipment (220) to prepare to receive over the second carrier.

4. The method of claim 1, wherein the act of transmitting (A430) the DL data over the first and second carriers comprises:

splitting (A510) the DL data into at least first and second data parts;

notifying (A520) the user equipment (220) of the DL data transmission over the first and second carriers;

transmitting (A530) the first data part over the first carrier; and

transmitting (A540) the second data part over the second carrier after waiting the predetermined delay.

5. The method of claim 4, wherein the act of notifying (A520) the user equipment (220) comprises providing (A610), over the first carrier, information regarding the second carrier.

6. The method of claim 5, wherein the act of notifying (A520) the user equipment (220) further comprises:

providing (A620), over the first carrier or the second carrier, information regarding RBs (resource blocks) of the second carrier allocated to carry the second data part.

7. The method of claim 6, wherein the information regarding the RBs is provided on a PDSCH (Physical downlink shared channel) or on a PDCCH (physical downlink control channel) of the first carrier or on the PDCCH of the second carrier.

8. The method of claim 1, further comprising:

transmitting (A440) the DL data over the first or the second carrier when it is determined that the second carrier should not be additionally used,

wherein when the DL data is transmitted over the second carrier, the DL data is transmitted after the predetermined delay.

9. The method of claim 8, wherein in the act of transmitting (A440) the DL data over the first or the second carrier, it is determined that the DL data should be carried over the second carrier when any one or more of the following is true:

a channel quality of the second carrier is higher than a channel quality of the first carrier,

a SIR (signal-to-interference ratio) of the second carrier is higher than a SIR of the first carrier,

a RSRP (received signal reference power) of the second carrier is higher than a RSRP of the first carrier,

a data transmission rate of the second carrier is higher than a data transmission rate of the first carrier,

an error rate of the second carrier is lower than an error rate of the first carrier, and

a remaining data carrying capacity of the second carrier is more than a remaining data carrying capacity of the first carrier.

10. A base station (210), comprising:

a communications unit (930) arranged to communicate with a user equipment (220); and

a processing unit (910) arranged to;

establish, via the communications unit (930), a connection over one or more anchor carriers including a first carrier, wherein the anchor carriers are used to provide control signals from the base station (210) to a user equipment (210);

make a determination as to whether the DL data destined to the user equipment (220) should be additionally transferred over a second carrier; and

transmit, via the communications unit (930), the DL data over the first and second carriers when it is determined that the second carrier should be additionally used,

wherein there is a predetermined delay between the transmission over the first and second carriers.

11. The base station (210) of claim 10, wherein the second carrier is not one of the anchor carriers.

12. The base station (210) of claim 10, wherein the predetermined delay is an amount of time sufficient for the user equipment (220) to prepare to receive over the second carrier.

13. The base station (210) of claim 10, wherein the processing unit (910) is arranged to:

split the DL data into at least first and second data parts;

notify, via the communications unit (930), the user equipment (220) of the DL data transmission over the first and second carriers;

transmit the first data part over the first carrier via the communications unit (930); and

transmit the second data part over the second carrier after waiting a predetermined delay.

14. The base station (210) of claim 13, wherein the processing unit (910) is arranged to provide, over the first carrier, information regarding the second carrier.

15. The base station (210) of claim 14, wherein the processing unit (910) is arranged to provide, over the first carrier or the second carrier, information regarding RBs (resource blocks) of the second carrier allocated to carry the second data part.

16. The base station (210) of claim 15, wherein the information regarding the RBs is provided on a PDSCH (Physical downlink shared channel) or on a PDCCH (physical downlink control channel) of the first carrier or on the PDCCH of the second carrier.

17. The base station (210) of claim 10, wherein the processing unit (910) is arranged to:

transmit the DL data over the first or the second carrier when it is determined that the second carrier should not be additionally used,

wherein when the DL data is transmitted over the second carrier, the DL data is transmitted after the predetermined delay.

18. The base station (210) of claim 17, the processing unit (910) is arranged to determine that the DL data should be carried over the second carrier when any one or more of the following is true:

a channel quality of the second carrier is higher than a channel quality of the first carrier,

a SIR (signal-to-interference ratio) of the second carrier is higher than a SIR of the first carrier,

a RSRP (received signal reference power) of the second carrier is higher than a RSRP of the first carrier,

a data transmission rate of the second carrier is higher than a data transmission rate of the first carrier,

an error rate of the second carrier is lower than an error rate of the first carrier, and

a remaining data carrying capacity of the second carrier is more than a remaining data carrying capacity of the first carrier.

19. A method for operating a user equipment (22) of a wireless network (200), comprising:

establishing (A1010) a connection over one or more anchor carriers including a first carrier, wherein the anchor carriers are used to provide control signals from a base station (210) to the user equipment (210);

receiving (A1020) a notification from the base station (210);

making a determination (A1030) whether the base station (210) will additionally use a second carrier to transfer the DL data based on the notification; and

receiving (A1040) the DL data over the first and second carriers when it is determined that the base station (210) will additionally use the second carrier,

wherein a first data part of the DL data is received over the first carrier, and after a predetermined delay, a second data part of the DL data is received over the second carrier.

20. The method of claim 19, further comprising:

making a determination (A1050) whether the base station (210) will alternately use the second carrier to transfer the DL data based on the notification;

receiving (A1060) the DL data over the second carrier after the predetermined delay when it is determined that the base station (210) will alternately use the second carrier; and

receiving (A1070) the DL data over the first carrier when it is determined that the base station (210) will not alternately use the second carrier.

21. The method of claim 19, wherein the notification includes information regarding the second carrier carried over the first carrier.

22. The method of claim 21, wherein the notification includes information regarding RBs (resource blocks) of the second carrier allocated for DL data carried over the first carrier or over the second carrier.

23. The method of claim 22, wherein the information regarding the RBs is provided on a PDSCH (Physical downlink shared channel) or on a PDCCH (physical downlink control channel) of the first carrier or on the PDCCH of the second carrier.

24. The method of claim 19, wherein the second carrier is not one of the anchor carriers.

25. The method of claim 19, wherein the predetermined delay is an amount of time sufficient for the user equipment (220) to prepare to receive over the second carrier.

26. A user equipment (220) in a wireless network (200) capable of communicating with a base station (210) over plural carriers, comprising:

a communications unit (1120) arranged to communicate with base station (210); and

a processing unit (1110) arranged to;

establish, via the communications unit (1120), a connection over one or more anchor carriers including a first carrier, wherein the anchor carriers are used to provide control signals from the base station (210);

receive, via the communications unit (1120), a notification from the base station (210);

make a determination whether the base station (210) will additionally use a second carrier to transfer the DL data based on the notification; and

receive, via the communications unit (1120), the DL data over the first and second carriers when it is determined that the base station (210) will additionally use the second carrier,

wherein a first data part of the DL data is received over the first carrier, and after a predetermined delay, a second data part of the DL data is received over the second carrier.

27. The user equipment (220) of claim 26, wherein the processing unit (1110) is arranged to:

make a determination whether the base station (210) will alternately use the second carrier to transfer the DL data based on the notification;

receive, via the communications unit (1120), the DL data over the second carrier after the predetermined delay when it is determined that the base station (210) will alternately use the second carrier; and

receive, via the communications unit (1120), the DL data over the first carrier when it is determined that the base station (210) will not alternately use the second carrier.

28. The user equipment (220) of claim 26, wherein the notification includes information regarding the second carrier carried over the first carrier.

29. The user equipment (220) of claim 28, wherein the notification includes information regarding RBs (resource blocks) of the second carrier allocated for DL data carried over the first carrier or over the second carrier.

30. The user equipment (220) of claim 29, wherein the information regarding the RBs is provided on a PDSCH (Physical downlink shared channel) or on a PDCCH (physical downlink control channel) of the first carrier or on the PDCCH of the second carrier.

31. The user equipment (220) of claim 26, wherein the second carrier is not one of the anchor carriers.

32. The user equipment (220) of claim 26, wherein the predetermined delay is an amount of time sufficient for the user equipment (220) to prepare to receive over the second carrier.