Method Implemented in an eNodeB

• US 20130163536A1
• Filed: 12/19/2012
• Published: 06/27/2013
• Est. Priority Date: 12/23/2011
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Anderson, Nicholas William, Harrison, Robert Mark, Novak, Robert, Vutukuri, Eswar
• Granted Patent: US 8,929,319 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0096 Indication of changes in allocation
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal

Abstract

In some implementations, a method implemented in an eNodeB (eNB) base station for single carrier frequency division multiple access SC-FDMA within a wireless system includes assigning to a user equipment a plurality of uplink scheduling request resources each comprising a plurality of subcarriers. It is determined that change in scheduling request resource used by the UE should be made. Upon determining that a change in scheduling request resource should be made, a command is transmitted to the UE instructing the UE to transmit scheduling requests on another of the plurality of assigned scheduling request resources.

Claims

1. A method implemented in an eNodeB eNB base station for single carrier frequency division multiple access SC-FDMA within a wireless system comprising:

assigning to a user equipment a plurality of uplink scheduling request resources each comprising a plurality of subcarriers;

determining that a change in scheduling request resource used by the UE should be made; and

upon determining that a change in scheduling request resource should be made, transmitting a command to the UE instructing the UE to transmit scheduling requests on another of the plurality of assigned scheduling request resources.

2. A method according to claim 1 wherein the plurality of uplink scheduling request resources are associated with a scheduling request resource type;

determining that a change in scheduling request resource used by the UE should be made comprises determining that a change in scheduling request resource type should be made.

3. A method according to claim 1 wherein at least one of the assigned scheduling request resources is a shared SC-FDMA resource assigned to a plurality of UEs of the wireless system and at least one other of the assigned scheduling request resources is a dedicated SC-FDMA resource assigned only to the UE.

4. A method according to claim 1 wherein a plurality of the assigned scheduling request resources are dedicated SC-FDMA resources assigned only to the UE.

5. A method according to claim 1 wherein a plurality of the assigned SC-FDMA scheduling request resources are each assigned to a plurality of UEs of the wireless system.

6. A method according to claim 1 wherein determining that a change of scheduling request resource should be made comprises detecting a change in activity of the UE based on at least one of:

a current data activity status or a data activity level relating to the UE;

an activity relating to one or more applications resident on the UE;

an activity relating to services or logical channels associated with the UE;

a discontinuous reception timer, DRX state or sub-state;

a change in pattern relating to a DRX;

a determination of whether one or more timers controlling DRX behaviour are running or have expired;

a determination or measurement of pathloss between the eNB and the UE;

a determination or measurement of a downlink carrier to interference C/I or downlink carrier to interference-plus-noise C/N+I;

a determination or measurement of a uplink carrier to interference C/I or uplink carrier to interference-plus-noise C/N+I;

an uplink data rate for the UE;

an uplink modulation and coding scheme for the UE;

a ratio of a maximum device transmit power to a current UE transmission power.

7. A method according to claim 1 further comprising decoding a user ID from an uplink signal received on at least one of the plurality of assigned scheduling request resources and wherein a message allocating shared SC-FDMA uplink resources is transmitted to the UE associated with the decoded user ID.

8. A method according to claim 7 wherein the uplink signal is an uplink control channel signal.

9. A method according to claim 8 wherein the received uplink signal comprises a Physical Uplink Control Channel PUCCH format 2 or format 3 signal.

10. A method according to claim 8 wherein the step of decoding comprises using a block forward error correction FEC decoder.

11. A method according to claim 7 wherein the uplink signal is an uplink shared channel signal.

12. A method according to claim 11 wherein the received uplink control channel signal comprises a Physical Uplink Shared Channel PUSCH signal.

13. A method according to claim 11 wherein the step of decoding comprises using a turbo forward error correction FEC decoder.

14. A method according to claim 7 further comprising

despreading the uplink signal to form a first plurality of modulation symbol estimates;

and

utilising the first plurality of modulation symbol estimates to decode the user ID.

15. A method according to claim 1 wherein assigning at least one of the plurality of scheduling request resources comprises transmitting a broadcast transmission or a common signalling message.

16. A method according to claim 7 wherein assigning at least one of the plurality of scheduling request resources comprises transmitting a dedicated signalling message to a target UE.

17. A method according to claim 7 wherein the user ID is related to a Cell Radio Network Temporary Identifier C-RNTI.

18. A method according to claim 7 wherein at least one of the assigned plurality of scheduling request resources is within a PUCCH frequency region of an uplink system bandwidth of the wireless system.

19. A method according to claim 7 wherein at least one of the assigned plurality of scheduling request resources is within a PUSCH frequency region of an uplink system bandwidth of the wireless system.

20. A method according to claim 7 wherein SC-FDMA is used by the eNB for receiving uplink communication signals.

21. A method according to claim 7, wherein a modulation scheme other than SC-FDMA is used by the eNB for sending downlink communication signals.

22. An eNodeB base station for single carrier frequency division multiple access SC-FDMA within a wireless system operable to perform a method according to claim 1.

23. A wireless system comprising an eNodeB base station according to claim 22.

24. A computer-readable medium comprising executable instructions that upon execution by a device perform a method according to claim 1.