Nova Patents
US20140092871A1

Method and apparatus for implementing tracking area update and cell reselection in a long term evolution system

Claim Score by NHIP

Read claim 11, the broadest

Abstract

The invention performs long term evolution (LTE) tracking area updates (TAUs), and tracking area code (TAC) and public land mobile network identification (PLMN-ID) assisted optimized wireless transmit/receive unit (WTRU) cell reselection. An evolved Node-B broadcasts system information including at least one system information block (SIB) based at least in part on an enhanced universal terrestrial radio access network (E-UTRAN) parameter response message sent by an evolved packet core (EPC) network. A WTRU generates a new TAC, which represents a tracking area identification (TA-ID) of a new cell, based on the system information, and compares the new TAC to an existing TAC, which represents a TA-ID of a previous cell. The WTRU transmits to the EPC network a TAU request message including the TA-ID of the new cell. The EPC network sends either a TAU accept message or a TAU reject message to the WTRU.

US20140092871A1, drawing sheet 1
Sheet 1 of 4

Term

2.4 yearsto projected expiry

Projected expiry 5 March 2029, counted from filing; an application has no term until it is granted.

  1. Priority
  2. Filed
  3. Published
  4. Today
  5. Projected expiry

14 claims: 3 independent, 11 dependent

  1. 1
    A method for communicating a tracking area identity, the method comprising:receiving system information comprising a system information block (SIB), wherein the SIB comprises a mobile country code (MCC), a mobile network code (MNC), and a tracking area code (TAC);identifying a tracking area of a new cell using the TAC;detecting, based on the SIB, whether the TAC matches one of a plurality of currently registered tracking areas;determining that the TAC does not match one of a plurality of tracking areas located on a forbidden tracking area list;generating a tracking area update (TAU) request message upon detecting that the TAC does not match one of the plurality of currently registered tracking areas;and transmitting the TAU request message;receiving a TAU Accept Message, wherein the TAU Accept Message comprises a list of accepted tracking areas;and removing at least one tracking area from the forbidden tracking area list based on the at least one tracking area being included in the list of accepted tracking areas.
  2. 6
    A wireless transmit/receive unit (WTRU) comprising:at least one antenna;a receiver coupled to the at least one tracking area antenna, the receiver configured to receive system information comprising a system information block (SIB) via the at least one antenna, wherein the SIB comprises a mobile country code (MCC), a mobile network code (MNC), and a tracking area code (TAC);a processor coupled to the receiver, the processor configured to identify a tracking area of a new cell using the TAC, detect, based on the received system information, whether the TAC matches one of a plurality of currently registered tracking areas, determine that the TAC does not match one of a plurality of tracking areas located on a forbidden tracking area list, and generate a tracking area update (TAU) request message when the processor detects that the TAC does not match one of the plurality of currently registered tracking areas;a transmitter configured to transmit the TAU request message to an evolved Node B (eNB) via the at least one antenna;the receiver further configured to receive a TAU Accept Message, wherein the TAU Accept Message comprises a list of accepted tracking areas;and the processor further configured to remove at least one tracking area from the forbidden tracking area list based on the at least one tracking area being included in the list of accepted tracking areas.
  3. 11
    Broadest claimClaim Score 52, average(NHIP)An evolved Node-B (eNodeB) comprising:at least one antenna;a processor coupled to a receiver, the processor configured to receive network area partitioning information from an evolved packet core network, generate enhanced universal terrestrial radio access network (E-UTRAN) system information, form a system information block (SIB) based, at least in part, on the network area partitioning information, wherein the SIB comprises a mobile country code (MCC), a mobile network code (MNC), and a tracking area code (TAC), wherein the (TAC) identifies a tracking area of a cell served by the eNodeB;a transmitter coupled to the antenna, the transmitter configured to broadcast the (SIB) via the at least one antenna.
Independent claims3