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Method and apparatus for cell reselection for a wireless communication device

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20140050129 patent thumbnailZoom

Method and apparatus for cell reselection for a wireless communication device


A method and apparatus for cell reselection for a wireless communication device are disclosed.
Related Terms: Wireless Communication Device Wireless Cell Reselection Reselection

Browse recent Blackberry Limited patents - Waterloo, CA
USPTO Applicaton #: #20140050129 - Class: 370280 (USPTO) -
Multiplex Communications > Duplex >Communication Over Free Space >Time Division

Inventors: Raghavendra Magadi Rangaiah, Andrew John Farnsworth, Takashi Suzuki

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The Patent Description & Claims data below is from USPTO Patent Application 20140050129, Method and apparatus for cell reselection for a wireless communication device.

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RELATED APPLICATIONS

The present application is a continuation of U.S. patent application Ser. No. 13/286,723, filed Nov. 1, 2011, the contents of which are incorporated herein by reference.

BACKGROUND

1. Technical Field

This application relates to mobile telecommunications systems in general, and in particular relates to a method and apparatus for handling UE mobility information for a wireless communication device. In particular, though not limited to, the application relates to a method and apparatus for cell reselection.

2. Description of the Related Art

In a typical cellular radio system, mobile user equipment (UE) communicates via a radio access network (RAN) to a core network. User equipment (UE) comprises various types of equipment such as mobile telephones (also known as cellular or cell phones), lap tops with wireless communication capability, personal digital assistants (PDAs) etc. These may be portable, hand held, pocket sized, installed in a vehicle etc and communicate voice and/or data signals with the radio access network.

A radio access network covers a geographical area typically divided into a plurality of cell areas. Each cell area is served by at least one base station, which in UMTS may be referred to as a Node B. Each cell is typically identified by a unique identifier which is broadcast in the cell. The base stations communicate at radio frequencies over an air interface with the UEs within range of the base station. Several base stations may be connected to a radio network controller (RNC) which controls various activities of the base Stations. The radio Network controllers are typically connected to a core network.

UMTS is a third generation public land mobile telecommunication system. Various standardization bodies are known to publish and set standards for third generation public land mobile telecommunication systems, each in their respective areas of competence. For instance, the 3GPP (Third Generation Partnership Project) in addition to publishing and setting standards for UMTS, also publishes and sets standards GSM (Global System for Mobile Communications) 3GPP2 (Third Generation Partnership Project 2) publishes and sets standards for CDMA (Code Division Multiple Access).

The 3GPP Technical Specification 25.331, release 10 addresses some aspects of UMTS RRC (Radio Resource Control) protocol requirements between the UMTS Terrestrial Radio Access Network (UTRAN) and the mobile user equipment (UE). 3GPP Technical Specification 25.304, release 10, addresses some UE procedures in Idle mode and procedures for cell reselection in connected mode. 3GPP Technical Specification 25.133, release 10, addresses some requirements for support of radio resource management (FDD). The specifications are referred to herein as the “Standard”, and are incorporated herein by reference.

More particularly clause 8.1.1.6.11a of the 25.331 specification relates to some aspects of handling information in System Information Block (SIB) type 11 bis. Clause 5.2.6 of the 25.304 specification relates to some aspects of cell reselection evaluation process. Clause 4.2.2.1 of the 25.133 specification relates to some aspects of measurement and evaluation of cell selection criteria of a serving cell.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described, by way of example only, with reference to the attached drawings, in which:

FIG. 1 is a diagram capturing the current 3GPP standardised UE behaviour as described therein;

FIG. 2 is a flow diagram capturing the current 3GPP standardised UE behaviour as described therein;

FIG. 3 is a diagram capturing the current 3GPP standardised UE behaviour as described therein;

FIG. 4 is a diagram capturing the current 3GPP standardised UE behaviour as described therein;

FIG. 5 is a flow diagram illustrating steps performed according to a first aspect of the approach described herein;

FIG. 6 is a flow diagram illustrating steps performed according to an alternative related to the first aspect of the approach described herein;

FIG. 7 is a flow diagram illustrating steps performed according to an alternative related to the first aspect of the approach described herein;

FIG. 8 is a flow diagram illustrating steps performed according to an alternative related to the first aspect of the approach described herein;

FIG. 9 is a flow diagram illustrating steps performed according to a second aspect of the approach described herein;

FIG. 10 is a flow diagram illustrating steps performed according to a third aspect of the approach described herein;

FIG. 11 shows an overview of a network and a UE device;

FIG. 12 is a block diagram illustrating an embodiment of a protocol stack provided in a UE device; and

FIG. 13 is a block diagram illustrating a UE device.

The same reference numerals are used in different figures to denote similar elements.

DETAILED DESCRIPTION

OF THE DRAWINGS

A method and apparatus for cell reselection for a wireless communication device is described herein. In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the new, inventive, and non-obvious concepts disclosed herein (hereinafter “concepts” or “concept”). It will be apparent, however, to one skilled in the art that the technique may be practised without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring the concepts disclosed herein.

The needs identified in the foregoing Background, and other needs and objects that will become apparent from the following description, are achieved by, in one aspect, a method and apparatus for cell reselection for a wireless communication device. In other aspects, the concept encompasses a wireless telecommunication device and a computer-readable medium configured to carry out the foregoing actions, as well as a data carrier carrying thereon or therein data indicative of instructions executable by processing means to cause those means to carry out the foregoing actions. Examples are CD-ROMs, memory sticks, dongles, transmitted signals, downloaded files etc. In particular, the method may be implemented in a mobile telecommunications device, with or without voice capabilities, or other electronic devices such as handheld or portable devices.

Overview

An overview of is now given of existing problems and how they are addressed according to the approaches described below. In the Figures, like reference numerals denote like components/messages and are not described unless repetition is required.

User equipment (UE) mobility within a network, such as a Universal Terrestrial Radio Access Network (UTRAN), may be either UE controlled or network controlled. In the case of a UTRAN network, UE controlled mobility is used in Idle mode and the states CELL_PCH, URA_PCH, CELL_FACH of Radio Resource Control (RRC) Connected mode and network controlled mobility is used in the CELL_DCH state of RRC Connected mode.

In the case of UE controlled mobility, the UE chooses a serving cell on which to ‘camp’ by the processes of cell selection and cell reselection. Cell selection is the process of choosing a serving cell when the UE does not currently have a serving cell (for example, when the UE has been first switched on, or when the UE is returning from loss of network coverage). Cell reselection is the process of changing from one serving cell to another serving cell. Typically the cell reselection process involves first performing measurements of the signal strength and/or signal quality of the serving cell and a number of candidate neighbour cells and then reselecting to one of the neighbour cells that is determined to offer better signal strength and/or quality than the current serving cell.

The network guides or assists the UE controlled cell reselection by providing control information in broadcast system information messages. The information may include neighbour cell lists to identify the carrier frequency and identity of candidate neighbour cells for cell reselection, and may also include various offsets, thresholds and other parameters to allow the network to control the UE\'s cell reselection behaviour. In a UTRAN cell, the broadcast Master Information Block (MIB) and System Information Block (SIB) Type 3, 4, 11, 11bis, 12, 18, and 19 messages may contain information related to cell reselection.

UTRAN system information is structured into a number of SIBs with each SIB carrying a set of related system information. The SIBs are repeatedly transmitted on the Broadcast Control Channel (BCCH) of every UTRAN cell. For transmission, large SIBs are segmented into up to 16 segments of size 222 bits, giving a maximum possible SIB size of 3552 bits.

SIB 11, 11bis and 12 contain information related to cell reselection. More specifically their content typically includes:

A list of up to 32 intra-frequency cells (i.e. cells on the same UTRAN carrier frequency as the cell broadcasting the information) that are identified by their primary scrambling code (PSC). In addition for each listed cell, there may be additional parameters (e.g. thresholds and offsets) that enable the network to control the UE\'s cell reselection behaviour.

A list of up to 32 inter-frequency cells (i.e. cells on a different UTRAN carrier frequency from the cell broadcasting the information) that are identified by a UTRAN Absolute Radio Frequency Channel Number (UARFCN) and PSC. Again, additional parameters may be included for each cell.

A list of up to 32 inter-RAT cells (i.e. cells using a different Radio Access Technology (RAT) such as GERAN). Again, additional parameters may be included for each cell.

SIB11 and SIB11bis are used by UEs that are in Idle mode and SIB12 is used, in addition to SIB11 and SIB11bis, by UEs that are in RRC Connected mode. It has been suggested that the maximum SIB size of 3552 bits could be the limiting factor in determining how many cells could be included in the neighbour cell lists in SIB 11 (i.e. it may not be possible to fit 32 intra-frequency, 32 inter-frequency and 32 inter-RAT cells, together with associated parameters, in SIB11 due to the 3552 bit limit). To address this problem, SIB11bis provides extra capacity to send the neighbour cell lists (although the maximum cells of each type that may be included across SIB11 and SIB11bis may remain the same at 32). SIB11bis is a “secondary” SIB to SIB11, the “primary” SIB11, in that SIB11 is to be received (received successfully and processed) first before there can be measurements and reselection evaluation of cells listed within SIB11bis. There could be more than one such secondary SIB to a primary SIB. Also, SIB11 would typically be populated in preference to SIB11bis. SIB11 and 11bis are of the same type, in that they can generally contain the same type of information. Two SIBs are of the same type if a set of items is constructed by taking items from both SIBs. The set of items can be constructed as a list, a table, a queue etc. In one example, the set of items can be a list of neighbour cells, presented in SIB11 and SIB11bis in two parts, for instance. The information is such that, in one example, good systems information is ensured when using information from only the primary SIB, or when information from both SIBs when combined. SIB11bis can be thought of, essentially, as an overflow to SIB11.

The neighbour cell lists contained in SIB11, SIB11bis and SIB12 are used to build a UE internal variable CELL_INFO_LIST and the order of the cells in this variable is derived from applying SIB11, then SIB11bis, then SIB12. The cells in this variable are used for measurements and measurement reporting if the UE later moves into CELL_DCH, for example. A problem identified is that if the UE were to place the cells in the variable in the wrong order (for example, deriving the order from SIB11bis, then SIB11 and then SIB12) and the UE moves into CELL_DCH state then subsequent updates to the list (addition, removal, or updating of cell information performed by reference to the cell\'s position in the list) as the UE moves and also inter-RAT measurements reports (which report cells by reference to their position in the list) would not be interpreted correctly. The order of the cells in the variable may not have any impact on cell reselection operation.

The Standard 3GPP TS 25.331v10.4.0 “Radio Resource Control (RRC); Protocol specification (Release 10), 2011-06, specifies the following:

8.1.1.6.11a System Information Block type 11bis

The UE should store all relevant IEs included in this system information block. The UE shall: 1> after reception of SIB 11 act upon the received IEs “Intra-frequency cell info list”, “Inter-frequency cell info list” and “Inter-RAT cell info list” as described in subclause 8.6.7.3;

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stats Patent Info
Application #
US 20140050129 A1
Publish Date
02/20/2014
Document #
14064947
File Date
10/28/2013
USPTO Class
370280
Other USPTO Classes
455437
International Class
04W36/00
Drawings
9


Wireless Communication Device
Wireless
Cell Reselection
Reselection


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