Device based two-stage random resource selection for small data transmission

• US 10,051,636 B2
• Filed: 02/19/2016
• Issued: 08/14/2018
• Est. Priority Date: 03/14/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Zeng, Wei, Soriaga, Joseph Binamira, Ji, Tingfang, Smee, John Edward, Bhushan, Naga
• Primary Examiner(s): Jiang, Charles C
• Assistant Examiner(s): Khawar, Saad
• Application Number:
  US15/048,254
• Publication Number:
  US 20160270083A1
• Time in Patent Office: 907 Days
• Field of Search: None
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/52 based on load
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

Wireless communications systems and methods related to the reduction in a probability of collision for grant-less transmissions from internet of everything (IOE) devices while not increasing search complexity at a base station are disclosed. An IOE device randomly selects a first access resource from a common pool, that the base station searches, to initiate a transmission. If a metric associated with the data transmission is predicted to exceed a threshold, the IOE device also randomly selects a second access resource from a collision reduction pool that the base station does not search. The IOE device notifies the base station, in the data transmission, to switch to the second access resource after a fixed period to the selected second access resource that is included in the data transmission. After the specified period, the base station and the IOE device switch to the second access resource and complete the data transmission.

Claims

1. A method for wireless communication, comprising:

transmitting, from a first wireless communications device to a second wireless communications device, a first set of data using a first access resource selected from a common pool of access resources as part of a grant-less transmission;

selecting, by the first wireless communication device in response to a determination that the grant-less transmission exceeds a threshold, a second access resource from a collision reduction pool that is configured to share resources in grant-less transmissions, wherein the collision reduction pool is separate from, and larger than, the common pool;

notifying, by the first wireless communications device, the second wireless communications device of a transition to the second access resource selected from the collision reduction pool, the notifying indicating the selected second access resource; and

transmitting, by the first wireless communications device, a second set of data to the second wireless communications device using the second access resource after transitioning to the second access resource.

2. The method of claim 1, wherein the notifying further comprises:

notifying the second wireless communications device to transition to the second access resource after a fixed number of subframes, wherein the first wireless communications device begins transmitting the second set of data after the fixed number of subframes.

3. The method of claim 1, further comprising:

selecting, by the first wireless communications device, the first access resource before the transmitting the first set of data; and

selecting, by the first wireless communications device, the second access resource before the transmitting the first set of data,

wherein the first and second access resources are selected randomly from the common pool and collision reduction pool, respectively.

4. The method of claim 1, further comprising:

receiving, prior to the transmitting the first set of data, the common pool and the collision reduction pool from the second wireless communications device as part of one or more broadcasts.

5. The method of claim 1, further comprising:

completing the transmitting using the second access resource, wherein the second set of data includes a remaining amount of data to the first set of data.

6. The method of claim 1, wherein the determination comprises:

analyzing, by the first wireless communications device, a downlink message from the second wireless communications device prior to initiating the transmission of the first set of data;

predicting, by the first wireless communications device, a transmission metric for the transmission of data including the first set of data based at least in part on the analysis of the downlink message; and

comparing, by the first wireless communications device, the predicted transmission metric with the threshold to determine if the predicted transmission metric exceeds the threshold.

7. The method of claim 1, further comprising:

determining, by the first wireless communications device, a transmission metric during the transmitting of the first set of data;

comparing, by the first wireless communications device, the determined transmission metric with the threshold during the transmitting of the first set of data to determine if the determined transmission metric exceeds the threshold;

selecting, by the first wireless communications device, the second access resource in response to the comparing; and

including, as part of the first set of data, the notification for the second wireless communications device to transition to the second access resource in response to the selection.

8. The method of claim 1, wherein:

the common pool of access resources and the collision reduction pool each comprises at least one of scrambling code/access time pairs or interleaver/access time pairs;

the first wireless communications device comprises an internet of everything device and the second wireless communications device comprises a base station; and

the common pool and the collision reduction pool are both shared among a plurality of internet of everything devices.

9. A method for wireless communication, comprising:

searching, by a first wireless communications device, a common pool of access resources to recover a first set of data received from a second wireless communications device using a first access resource selected from the common pool of access resources as part of a grant-less transmission;

receiving, at the first wireless communications device, a notification from the second wireless communications device to transition to a second access resource selected from a collision reduction pool that is configured to share resources in grant-less transmissions, the notification indicating the selected second access resource, and the collision reduction pool being separate from, and larger than, the common pool; and

switching, at the first wireless communications device, to the second access resource to recover a second set of data from the second wireless communications device without searching the collision reduction pool.

10. The method of claim 9, wherein the notification comprises a fixed number of subframes to delay before transitioning to the second access resource.

11. The method of claim 9, wherein the receiving the notification further comprises:

receiving the notification as part of the first set of data from the second wireless communications device.

12. The method of claim 9, wherein the receiving the notification further comprises:

receiving the notification using the first access resource after receiving at least a portion of the first set of data.

13. The method of claim 9, wherein the common pool of access resources and the collision reduction pool each comprises at least one of scrambling code/access time pairs or interleaver/access time pairs.

14. The method of claim 9, further comprising:

determining a range of access resources to include in the common pool of access resources and in the collision reduction pool.

15. The method of claim 14, further comprising:

broadcasting, from the first wireless communications device, the determined common pool of access resources and the collision reduction pool to the second wireless communications device, wherein the first wireless communications device comprises a base station and the second wireless communications device comprises an internet of everything device.

16. A first wireless communications device, comprising:

a processor configured to;

select a first access resource from a common pool of access resources as part of a grant-less transmission to a second wireless communications device; and

in response to a determination that the grant-less transmission exceeds a threshold, select a second access resource from a collision reduction pool that is configured to share resources in grant-less transmissions, the collision reduction pool being separate from, and larger than, the common pool; and

a transceiver configured to;

transmit a first set of data to the second wireless communications device using the first access resource, wherein the first set of data includes a notification for the second wireless communications device of a transition to the second access resource in response to the determination, the notification indicating the selected second access resource; and

transmit a second set of data to the second wireless communications device using the second access resource.

17. The first wireless communications device of claim 16, wherein the processor is further configured to include with the notification a fixed number of subframes to delay before transitioning to the second access resource.

18. The first wireless communications device of claim 16, further comprising:

a memory configured to store the common pool of access resources and the collision reduction pool, the common pool of access resources and the collision reduction pool each comprising at least one of scrambling code/access time pairs or interleaver/access time pairs,

wherein the processor is further configured to select the first access resource randomly and select the second access resource randomly, prior to transmitting the first set of data.

19. The first wireless communications device of claim 16, wherein the transceiver is further configured to:

receive, prior to the transmission of the first set of data, the common pool and the collision reduction pool from the second wireless communications device as part of one or more broadcasts.

20. The first wireless communications device of claim 16, wherein the transceiver is further configured to complete transmission of the second set of data using the second access resource, wherein the second set of data includes a remaining amount of the data.

21. The first wireless communications device of claim 16, wherein the processor is further configured to:

analyze a downlink message from the second wireless communications device prior to initiating the transmission of the first set of the data;

predict a transmission metric for the transmission of the data based at least in part on the analysis of the downlink message; and

compare the predicted transmission metric with the threshold to determine if the predicted transmission metric exceeds the threshold.

22. The first wireless communications device of claim 16, wherein the processor is further configured to:

determine a transmission metric during the transmission of the first set of the data;

compare the determined transmission metric with the threshold during the transmission of the first set of the data to determine if the determined transmission metric exceeds the threshold;

select the second access resource in response to the comparison; and

include, as part of the first set of the data, the notification for the second wireless communications device to transition to the second access resource in response to the selection.

23. The first wireless communications device of claim 16, wherein the first wireless communications device comprises an internet of everything device and the second wireless communications device comprises a base station, and the common pool and the collision reduction pool are both shared among a plurality of internet of everything devices.

24. A first wireless communications device, comprising:

a transceiver configured to;

receive a first set of data from a second wireless communications device, wherein the first set of the data is transmitted using a first access resource selected from a common pool of access resources as part of a grant-less transmission from the second wireless communications device; and

receive a notification from the second wireless communications device to transition to a second access resource selected from a collision reduction pool that is configured to share resources in grant-less transmissions, the notification indicating the selected second access resource, and the collision reduction pool being separate from, and larger than, the common pool; and

a processor configured to;

search the common pool of access resources to recover the first set of data received from the second wireless communications device; and

switch the transceiver to the second access resource to recover a second set of data from the second wireless communications device without searching the collision reduction pool.

25. The first wireless communications device of claim 24, wherein the notification comprises a fixed number of subframes to delay before transitioning to the second access resource.

26. The first wireless communications device of claim 24, wherein the transceiver is further configured to receive the notification as part of the first set of the data from the second wireless communications device.

27. The first wireless communications device of claim 24, wherein the transceiver is further configured to receive the notification using the first access resource after receiving at least a portion of the first set of the data.

28. The first wireless communications device of claim 24, wherein the common pool of access resources and the collision reduction pool each comprises at least one of scrambling code/access time pairs or interleaver/access time pairs.

29. The first wireless communications device of claim 24, wherein:

the processor is further configured to determine a range of access resources to include in the common pool of access resources and in the collision reduction pool, and

the transceiver is further configured to broadcast the determined common pool of access resources and the collision reduction pool to the second wireless communications device.

30. The first wireless communications device of claim 24, wherein first wireless communications device comprises a base station and the second wireless communications device comprises an internet of everything device.