User equipment controlled mobility in an evolved radio access network

Patent metadata

Field	Value
Publication number	US-11930449-B2
Application number	US-202218068087-A
Country	US
Kind code	B2
Filing date	Dec 19, 2022
Priority date	Apr 9, 2015
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

Briefly, in accordance with one or more embodiments, a user equipment (UE) may enter into an E-UTRAN Routing Area Paging Channel state, and is configured with an E-UTRAN Routing Area and an Anchor identifier to identify an anchor evolved Node B (eNB) for the UE. The UE selects to a new cell without performing a handover procedure, and performs a cell update procedure. The UE also may enter into a Cell Update Connected state, and is configured with an Anchor identifier. The UE selects to a new cell, performs a cell update procedure, performs a buffer request procedure, and performs a cell update procedure to download buffered data and to perform data transmission with the new cell.

First claim

What is claimed:

1. A processor of a user equipment (UE) configured to:
receive, when the UE is entering an inactive state, an indication of a routing area comprising a plurality of cells, wherein the indication comprises a list of cells in the routing area, wherein the indication is received during radio resource control (RRC) messaging between the UE and a base station;
enter, when the UE is in the inactive state, into the routing area comprising the plurality of cells;
reselect to a new cell without performing a handover procedure; and
perform a cell update procedure, comprising at least one of:
performing the cell update procedure with a cause value indicating a routing area change if the UE reselects to a cell that is not part of the routing area, and

performing the cell update procedure if the UE has uplink data for transmission.

2. The processor of claim 1 , wherein the UE stores a UE context between the UE and a last serving cell during cell reselection.

3. The processor of claim 1 , further configured to:
receive new routing area information comprising a collection of cell identifiers during the cell update procedure if the cell update procedure is triggered by the routing area change.

4. The processor of claim 1 , further configured to:
change to one of a connected state or an idle state during the cell update procedure.

5. A user equipment (UE), comprising:
radio frequency circuitry configured to communicate with a base station; and
a processor communicatively coupled to the radio frequency circuitry and configured to:
receive, when the UE is entering an inactive state, an indication of a routing area comprising a plurality of cells, wherein the indication comprises a list of cells in the routing area, wherein the indication is received during radio resource control (RRC) messaging between the UE and the base station;
enter, when the UE is in the inactive state, into the routing area comprising the plurality of cells;
reselect to a new cell without performing a handover procedure; and
perform a cell update procedure, comprising at least one of:
performing the cell update procedure with a cause value indicating a routing area change if the UE reselects to a cell that is not part of the routing area, and
performing the cell update procedure if the UE has uplink data for transmission.

6. The UE of claim 5 , wherein the UE stores a UE context between the UE and a last serving cell during cell reselection.

7. The UE of claim 5 , wherein the processor is further configured to receive new routing area information comprising a collection of cell identifiers during the cell update procedure if the cell update procedure is triggered by the routing area change.

8. The UE of claim 5 , wherein the processor is further configured to change to one of a connected state or an idle state during the cell update procedure.

9. A method, comprising:
receiving, when a user equipment (UE) is entering an inactive state, an indication of a routing area comprising a plurality of cells, wherein the indication comprises a list of cells in the routing area, wherein the indication is received during radio resource control (RRC) messaging between the UE and a base station;
entering, when the UE is in the inactive state, into the routing area comprising the plurality of cells;
reselecting to a new cell without performing a handover procedure; and
performing a cell update procedure, comprising at least one of:
performing the cell update procedure with a cause value indicating a routing area change if the UE reselects to a cell that is not part of the routing area, and
performing the cell update procedure if the UE has uplink data for transmission.

10. The method of claim 9 , further comprising:
storing a UE context between the UE and a last serving cell during cell reselection.

11. The method of claim 9 , further comprising:
receiving new routing area information comprising a collection of cell identifiers during the cell update procedure if the cell update procedure is triggered by the routing area change.

12. The method of claim 9 , further comprising:
changing to one of a connected state or an idle state during the cell update procedure.

Assignees

• Apple Inc

Inventors

• Stojanovski Alexandre S
• Pinheiro Ana Lucia A
• Burbidge Richard C
• Yiu Candy
• Heo Youn Hyoung
• Bangolae Sangeetha L

Classifications

• H04W48/20 Primary

  Selecting an access point · CPC title

• H04W48/16

  Discovering, processing access restriction or access information · CPC title

• H04W60/04

  using triggered events · CPC title

• H04W28/18

  Negotiating wireless communication parameters · CPC title

• H04W36/0079

  in case of hand-off failure or rejection · CPC title