Systems and methods to enhance radio link performance in a multi-carrier environment

• US 9,320,050 B2
• Filed: 06/28/2013
• Issued: 04/19/2016
• Est. Priority Date: 06/28/2013
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Singh, Ajoy K., Tabet, Tarik, Vangala, Sarma V.
• Primary Examiner(s): TOWFIGHI, AFSHAWN M
• Application Number:
  US13/930,610
• Publication Number:
  US 20150003336A1
• Time in Patent Office: 1,026 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 72/569 of the traffic information
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 92/20 between access points

Abstract

Described herein are systems and methods to enhance radio link performance in a multi-carrier environment. A method may comprise sending, by an upper level layer of a wireless device, user data in a packet for transmission, wherein the packet includes an indication of a level of priority of the packet, receiving, by a media access control (“MAC”) layer of the wireless device, the packet for transmission including the indication of the level of priority provided by the upper level layer, identifying, by the MAC layer, a reliability of each of a plurality of component carriers, and selecting, by the MAC layer, one of the component carriers on which to transmit the packet, wherein the selecting is based on the level of priority of the packet and the reliability of the one of the component carriers.

Claims

1. A method, comprising:

sending, by a media access control (“

MAC”

) layer of a wireless device to an upper level layer of the wireless device, a request for packets having a predetermined level of priority;

sending, by the upper level layer, data in a packet for transmission, wherein the packet includes an indication of a level of priority of the packet, wherein the indicated level of priority satisfies the predetermined level of priority;

receiving, by the MAC layer, the packet including the indication of the level of priority provided by the upper level layer;

identifying, by the MAC layer, a reliability of each of a plurality of component carriers; and

selecting, by the MAC layer, one of the component carriers on which to transmit the packet, wherein the selecting is based on the level of priority of the packet and the reliability of the one of the component carriers.

2. The method of claim 1, wherein when the packet is indicated as a high priority, the selected one of the component carriers is a component carrier identified as having a higher reliability than a majority of the component carriers.

3. The method of claim 2, wherein the packet includes an indication of high priority when the packet is one of a retransmitted packet, a data packet including a transmission control protocol acknowledgement (“

TCP-ACK”

), a packet including robust header compression (“

ROHC”

) feedback, and a packet including real-time transport protocol (“

RTP”

) control protocol (“

RTCP”

) feedback.

4. The method of claim 1, wherein the identifying the reliability includes at least one of utilizing at least one of a channel quality metric from uplink signals as sounding reference signals and wireless device feedback as channel state information and reference signal received power/reference signal received quality, analyzing block error rate estimation from acknowledgment and non-acknowledgment transmissions, and analyzing MAC/RLC layer retransmission and segmentation patterns of each of the plurality of component carriers.

5. The method of claim 1, wherein the wireless device is one of a user equipment (“

UE”

) uplinking the data to a wireless network and a base station downlinking the data to the UE.

6. The method of claim 1, wherein the MAC layer sends data simultaneously over the plurality of component carriers.

7. The method of claim 6, wherein the same data is sent simultaneously over the plurality of component carriers by encoding the data identically in the packet and a further packet and sending the packet via the one of the component carriers and the further packet via another one of the component carriers.

8. The method of claim 6, wherein the same data is sent simultaneously over the plurality of component carriers by encoding the data in a first manner in the packet and encoding the data in a second manner in a further packet and sending the packet via the one of the component carriers and the further packet via another one of the component carriers.

9. A device, comprising:

a non-transitory memory having a program stored thereon; and

a processor executing the program, wherein the execution of the program causes the processor to perform operations comprising;

sending, by a media access control (“

MAC”

) layer of a wireless device to an upper level layer of the wireless device, a request for packets having a predetermined level of priority;

sending, by the upper level layer, data in a packet for transmission, wherein the packet includes an indication of a level of priority of the packet, wherein the indicated level of priority satisfies the predetermined level of priority, and

receiving, by the MAC layer of the device, the packet including the indication of the level of priority provided by the upper level layer,

identifying, by the MAC layer, a reliability of each of a plurality of component carriers, and

selecting, by the MAC layer, one of the component carriers on which to transmit the packet, wherein the selecting is based on the level of priority of the packet and the reliability of the one of the component carriers.

10. The device of claim 9, wherein when the packet is indicated as a high priority, the selected one of the component carriers is a component carrier identified as having a higher reliability than a majority of the component carriers.

11. The device of claim 9, wherein the identifying the reliability includes at least one of utilizing at least one of a channel quality metric from uplink signals as sounding reference signals and device feedback as channel state information and reference signal received power/reference signal received quality, analyzing block error rate estimation from acknowledgment and non-acknowledgment transmissions, and analyzing MAC/RLC layer retransmission and segmentation patterns of each of the plurality of component carriers.

12. The device of claim 9, wherein the wireless device utilizes downlink channel quality metrics in uplink scheduling during the selection of the one of the component carriers on which to transmit the packet.

13. The device of claim 9, wherein the MAC layer sends data simultaneously over the plurality of component carriers.

14. The device of claim 13, wherein the same data is sent simultaneously over the plurality of component carriers by encoding the data identically in the packet and a further packet and sending the packet via the one of the component carriers and the further packet via another one of the component carriers.

15. The device of claim 13, wherein the same data is sent simultaneously over the plurality of component carriers by encoding the data in a first manner in the packet and encoding the data in a second manner in a further packet and sending the packet via the one of the component carriers and the further packet via another one of the component carriers.

16. A non-transitory computer readable storage medium with an executable program stored thereon, wherein the program instructs a processor to perform the following operations, comprising:

sending, by a media access control (“

MAC”

) layer of a wireless device to an upper level layer of the wireless device, a request for packets having a predetermined level of priority;

sending, by the upper level layer, data in a packet for transmission, wherein the packet includes an indication of a level of priority of the packet, wherein the indicated level of priority satisfies the predetermined level of priority;

receiving, by the MAC layer of the wireless device, the packet including the indication of the level of priority provided by the upper level layer;

identifying, by the MAC layer, a reliability of each of a plurality of component carriers; and

selecting, by the MAC layer, one of the component carriers on which to transmit the packet, wherein the selecting is based on the level of priority of the packet and the reliability of the one of the component carriers.

17. The computer readable storage medium of claim 16, wherein when the packet is indicated as a high priority, the selected one of the component carriers is a component carrier identified as having a higher reliability than a majority of the component carriers.

18. The computer readable storage medium of claim 16, wherein the MAC layer sends data simultaneously over the plurality of component carriers.

19. The computer readable storage medium of claim 18, wherein the same data is sent simultaneously over the plurality of component carriers by encoding the data identically in the packet and a further packet and sending the packet via the one of the component carriers and the further packet via another one of the component carriers.

20. The computer readable storage medium of claim 18, wherein the same data is sent simultaneously over the plurality of component carriers by encoding the data in a first manner in the packet and encoding the data in a second manner in a further packet and sending the packet via the one of the component carriers and the further packet via another one of the component carriers.