Method and system for optimized access of a physical random access channel

• US 8,902,742 B2
• Filed: 10/08/2012
• Issued: 12/02/2014
• Est. Priority Date: 10/08/2012
• Status: Active Grant

• Current Assignee: Lenovo Singapore Pte Limited (Lenovo Group Ltd.)
• Original Assignee: Fujitsu Limited
• Inventors: Viorel, Dorin, Zhu, Chenxi, Ito, Akira
• Primary Examiner(s): Rinehart, Mark
• Assistant Examiner(s): Hunt, Kenneth P
• Application Number:
  US13/647,264
• Publication Number:
  US 20140098660A1
• Time in Patent Office: 785 Days
• Field of Search: 370/329
• US Class Current: 370/229
• CPC Class Codes: H04W 28/0205 at the air interface dynamic wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A method for optimized access of a physical random access channel (PRACH) includes sampling a plurality of mapped zones associated with a base station. Each of the mapped zones has a plurality of endpoints. The method further includes determining a subset of disconnected endpoints in the given mapped zone where the disconnected endpoints are disconnected from a wireless network. The method also includes estimating a PRACH load based on the subset of disconnected endpoints. Additionally, based on whether the estimated PRACH load is a pre-determined factor larger than an original PRACH allocation, the method includes increasing the PRACH allocation to accommodate reconnection of the subset of disconnected endpoints in the given mapped zone.

Claims

1. A method for access of a physical random access channel (PRACH) comprising:

sampling a plurality of endpoints included in a plurality of mapped zones associated with a base station, wherein sampling the plurality of endpoints includes polling a subset of the plurality of endpoints; and

for each mapped zone of the plurality of mapped zones;

determining a subset of disconnected endpoints, the disconnected endpoints being disconnected from a wireless network;

estimating a PRACH load based on the subset of disconnected endpoints; and

based on whether the estimated PRACH load is a pre-determined factor larger than an original PRACH allocation, increasing a PRACH allocation for accommodating reconnection of the subset of disconnected endpoints.

2. The method of claim 1, further comprising, for each mapped zone of the plurality of mapped zones:

reconnecting the subset of disconnected endpoints; and

reverting the PRACH allocation to the original PRACH allocation.

3. The method of claim 1, wherein the mapped zones include time advancing zones.

4. The method of claim 1, wherein the subset of disconnected endpoints is determined based at least in part on a primary synchronization signal and a secondary synchronization signal.

5. The method of claim 1, wherein the PRACH allocation for accommodating reconnection of the subset of disconnected endpoints is based on a percentage of available PRACH preamble signatures.

6. The method of claim 1, further comprising:

determining the subset of disconnected endpoints in a plurality of the mapped zones; and

prioritizing the reconnection of the subset of disconnected endpoints based on the quantity of disconnected endpoints in each of the plurality of the mapped zones.

7. One or more non-transitory computer-readable media embodying logic that, when executed by a processor, is configured to perform operations comprising:

sampling a plurality of endpoints included in a plurality of mapped zones associated with a base station, wherein sampling the plurality of endpoints includes polling a subset of the plurality of endpoints; and

for each mapped zone of the plurality of mapped zones;

determining a subset of disconnected endpoints, the disconnected endpoints being disconnected from a wireless network;

estimating a PRACH load based on the subset of disconnected endpoints; and

based on whether the estimated PRACH load is a pre-determined factor larger than an original PRACH allocation, increasing a PRACH allocation for accommodating reconnection of the subset of disconnected endpoints.

8. The non-transitory media of claim 7, wherein the logic is further configured to cause the processor to perform operations comprising, for each mapped zone of the plurality of mapped zones:

reconnecting the subset of disconnected endpoints in; and

reverting the PRACH allocation to the original PRACH allocation.

9. The non-transitory media of claim 7, wherein the mapped zones include time advancing zones.

10. The non-transitory media of claim 7, wherein the disconnected subset of endpoints are determined based at least in part on a primary synchronization signal and a secondary synchronization signal.

11. The non-transitory media of claim 7, wherein the PRACH allocation for accommodating reconnection of the subset of disconnected endpoints is based on a percentage of available PRACH preamble signatures.

12. The non-transitory media of claim 7, wherein the logic is further configured to cause the processor to perform operations comprising:

determining the subset of disconnected endpoints in a plurality of the mapped zones; and

prioritizing the reconnection of the subset of disconnected endpoints based on the quantity of disconnected endpoints in each of the plurality of the mapped zones.

13. A base station for wireless communication comprising:

a memory;

a processor coupled to a memory, the processor configured to;

sample a plurality of endpoints included in a plurality of mapped zones associated with a base station, wherein sampling the plurality of endpoints includes polling a subset of the plurality of endpoints; and

for each mapped zone of the plurality of mapped zones;

determine a subset of disconnected endpoints, the disconnected endpoints being disconnected from a wireless network;

estimate a PRACH load based on the subset of disconnected endpoints; and

based on whether the estimated PRACH load is a pre-determined factor larger than an original PRACH allocation, increase a PRACH allocation for accommodating reconnection of the subset of disconnected endpoints.

14. The base station of claim 13, wherein the processor is further configured to, for each mapped zone of the plurality of mapped zones:

reconnect the subset of disconnected endpoints; and

revert the PRACH allocation to the original PRACH allocation.

15. The base station of claim 13, wherein the mapped zones include time advancing zones.

16. The base station of claim 13, wherein the disconnected subset of endpoints are determined based at least in part on a primary synchronization signal and a secondary synchronization signal.

17. The base station of claim 13, wherein the PRACH allocation is for accommodating reconnection of the subset of disconnected endpoints is based on a percentage of available PRACH preamble signatures.

18. The base station of claim 13, wherein the processor is further configured to:

determine the subset of disconnected endpoints in a plurality of the mapped zones; and

prioritize the reconnection of the subset of disconnected endpoints based on the quantity of disconnected endpoints in each of the plurality of the mapped zones.