Enhancement and improvement for hetnet deployments

• US 9,204,316 B2
• Filed: 09/30/2011
• Issued: 12/01/2015
• Est. Priority Date: 09/30/2011
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Suzuki, Takashi, Cai, Zhijun, Purnadi, Rene Warapurtra, Yu, Yi
• Primary Examiner(s): Safaipour, Bobbak
• Application Number:
  US13/250,486
• Publication Number:
  US 20130084910A1
• Time in Patent Office: 1,523 Days
• Field of Search: 455/515
• US Class Current: 1/1
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A method is provided for communication. The method comprises, when a measurement resource restriction is configured, verifying whether stored system information is valid by examining a system information identifier after a modification period has occurred.

Claims

1. A method for communication, comprising:

when a measurement resource restriction is configured, verifying whether stored system information is valid by examining a value tag of system information messages after a boundary of a modification period has occurred,

wherein, when a user equipment (UE) is in a connected mode, an attempt is not made by the UE to read a paging message to find a system information modification indication during the modification period.

2. The method of claim 1, wherein the value tag of the system information messages is the systemInfoValueTag in SystemInformationBlockType1.

3. The method of claim 1, wherein the system modification indication is the systemInfoModification indication in a Paging message.

4. The method of claim 1, wherein the measurement resource restriction is at least one of:

restricting a user equipment (UE) to performing radio resource management measurement and radio link monitoring for a serving cell only in indicated subframes,

restricting the UE to performing radio resource management measurement for a neighbor cell only in indicated subframes; and

restricting the UE to performing channel state estimation only in indicated subframes.

5. The method of claim 1, wherein, when the UE fails to decode the system information, the UE does not flush a soft buffer at the end of a window for system information reception and combines subsequent transmissions of the system information with the stored information in the soft buffer as long as transmissions of the system information are within the modification period.

6. The method of claim 1, wherein, when the UE checks if its paging occasions in its paging frame are within normal subframes or if a certain percentage of its paging occasions within its paging frames are within normal subframes, the UE verifies that stored system information is valid by checking systemInfoValueTag in SystemInformationBlockType1 after the boundary of the modification period has occurred.

7. A user equipment (UE), comprising:

a processor configured such that, when a measurement resource restriction is configured, the UE verifies whether stored system information is valid by examining a value tag of system information messages after a boundary of a modification period has occurred,

wherein, when the UE is in a connected mode, the UE does not attempt to read a paging message to find a system information modification indication during the modification period.

8. The UE of claim 7, wherein the value tag of the system information messages is the systemInfoValueTag in SystemInformationBlockType1.

9. The UE of claim 7, wherein the system modification indication is the systemInfoModification indication in a Paging message.

10. The UE of claim 7, wherein the measurement resource restriction is at least one of:

restricting the UE to performing radio resource management measurement and radio link monitoring for a serving cell only in indicated subframes;

restricting the UE to performing radio resource management measurement for a neighbor cell only in indicated subframes; and

restricting the UE to performing channel state estimation only in indicated subframes.

11. The UE of claim 7, wherein, when the UE fails to decode the system information, the UE does not flush a soft buffer at the end of a window for system information reception and combines subsequent transmissions of the system information with the stored information in the soft buffer as long as transmissions of the system information are within the modification period.

12. The UE of claim 7 wherein, when the UE checks if its paging occasions in its paging frame are within normal subframes or if a certain percentage of its paging occasions within its paging frames are within normal subframes, the UE verifies that stored system information is valid by checking systemInfoValueTag in SystemInformationBlockType1 after the boundary of the modification period has occurred.

13. A network element, comprising:

a processor configured such that the network element pages a user equipment (UE) that is configured with at least one measurement resource restriction, the paging occurring in at least one restricted subframe subsequent to a scheduled paging occasion for the UE,

wherein the network element indicates the number of subframes after the scheduled paging occasion the UE is to check for a page from the network element.

14. The network element of claim 13, wherein the page includes a system modification identifier.

15. The network element of claim 13, wherein the measurement resource restriction is at least one of:

restricting the UE to performing radio resource management measurement and radio link monitoring for a serving cell only in indicated subframes;

restricting the UE to performing radio resource management measurement for a neighbor cell only in indicated subframes; and

restricting the UE to performing channel state estimation only in indicated subframes.

16. A method for communication, comprising:

when a measurement resource restriction is configured, verifying whether stored system information is valid by examining a value tag of system information messages after a boundary of a modification period has occurred,

wherein an attempt is not made to find a system information modification indication during the modification period, and

wherein the measurement resource restriction at least includes restricting a user equipment (UE) to performing radio resource management measurement and radio link monitoring for a serving cell only in indicated subframes.