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

Method and device for implementing tracking area update and cell reselection in long-term evolution system

Method and Apparatus for Implementing Tracking Area Update And Cell Reselection In A Long Term Evolution System

The present invention relates to a wireless communication system.

Recently, in order to provide improved spectrum efficiency and faster user experience, the Third Generation Partnership Project (3GPP) has launched a long-term evolution (LTE) project to bring new technologies, new network architectures, and new technologies to wireless cellular networks. Configuration and new applications and services. A new term adopted by the LTE project is the concept of mobile tracking area, which replaces the location area (LA), registration area (RA) and universal land radio of the previous third-generation (3G) universal mobile telecommunication system (UMTS) Access network (UTRAN) registration area (URA).

There is only one common tracking area concept defined for Radio Access Network (RAN) and Core Network (CN) in LTE/System Architecture Evolution (SAE). The location of the LTE wireless transmission/reception unit (WTRU) in the idle state (LTE_IDLE) is known by the network at the tracking area interval. The goal is to reduce the complexity of mobile area management and therefore reduce the associated signaling overhead for mobility area updates. Only the tracking area (TA) is used for LTE instead of using RA/LA and URA for UMTS at the same time.

Before LTE, due to the second generation (2G) legacy equipment, 3G UMTS mobility area management had a location area, which included one or more routing areas. 3G UMTS also has URA, which covers one or more UMTS cells.

Mobility management includes URA updates managed by the Radio Resource Control (RRC) unit, and routing area updates managed by the General Packet Radio Service (GPRS) Mobility Manager (GMM) in the Non-Access Stratum (NAS) protocol (RAU). The WTRU URA update is triggered by matching the current URA identifier (URA-ID) with the cell public URA-ID of the UMTS system information block (SIB) type 2 (SIB-2). RAU is triggered by the change of any one of the public land mobile network identification (PLMN-ID), location area code (LAC) and routing area code (RAC). Note that both LAC and RAC are exposed to the cell via SIB-1. The current 3GPP UMTS system information broadcast content is shown in Table 1 below.

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When the previously used NAS RAU process and RRC URA update process are no longer applied, a new LTE Tracking Area Update (TAU) process and its related LTE SI, operating process, and tasks in different agreement levels and system levels will have to be defined.

Assuming conceptual and architectural changes, LTE system information will have to reflect these changes and be organized to facilitate better WTRU operation and optimization of overall system resource utilization.

The present invention implements LTE TAU and optimized (WTRU) cell reselection assisted by tracking area code (TAC) and PLMN-ID. An evolved NodeB (eNodeB) broadcasts system information. The system message includes at least one response message based at least in part on the Enhanced Universal Terrestrial Radio Access Network (E-UTRAN) parameter sent through the Evolved Packet Core (EPC) network SIB. The WTRU processes the new TAC, which represents the tracking area identifier (TA-ID) of the new cell based on system information, and compares the new TAC with the existing TAC, which represents the TA of the previous cell -ID. The WTRU sends a TAU request message including the TA-ID of the new cell to the EPC network. The EPC network sends a TAU accept message or a TAU reject message to the WTRU.

The present invention associates and groups LTE specific mobility tracking area identifiers, cell identifiers, and PLMN-IDs together to serve as a system for configuring coverage on E-UTRAN cells near the specific LTE cell that broadcasts system information News. The present invention also provides an optimized method for the LTE WTRU to perform cell measurement and cell reselection by using the LTE system information to achieve the smallest possible TAU signaling transmission overhead in the WTRU LTE_IDLE state.

In addition, a new LTE TA-ID is constructed, and a new LTE SIB is provided. The new LTE SIB is optimized for WTRU cell reselection and discloses the TA code/ID to the serving cell and also to the adjacent cells of the group. These service cells and group adjacent cells are represented by their cell ID (cell-ID) with PLMN-ID and TAC.

By using the WTRU process to process TA-related system information, the GMM unit in the NAS can perform TA broadcast detection in the system information to determine whether a TAU triggered by a TA change is required. This detection passes the RRC unit and its current TA tolerance ( allowance) is sent to the NAS. Alternatively, for ease of implementation, the RRC unit may also perform the aforementioned TA detection, and notify the NAS protocol stack if TAU is required.

TAC is used as a criterion in cell reselection, candidate cell selection, measurement scheduling, and final cell reselection permutation. The goal is to reselect appropriate cells without causing unnecessary TAU.

For high-level WTRU mobility control, the NAS protocol stack (ie software) and the high-level control of the tracking area in the UMTS User Identity Module (USIM) device must be implemented, that is, the "forbidden TA list". Describes the operations on the prohibited TA list.

The term "wireless transmission/reception unit (WTRU)" referred to below includes but is not limited to user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, mobile phone, personal digital assistant (PDA), computer or Any other type of user equipment working in a wireless environment. The term "eNodeB" referred to below includes, but is not limited to, base stations, site controllers, access points (APs), or any other types of peripheral devices that can work in a wireless environment.

Assuming the agreement in LTE mobility area tracking "there is only one common TA concept defined for RAN and CN in LTE/SAE", the tracking area concept replaces the current 3GPP routing area and UTRAN RA concepts and procedures. Therefore, the LTE TAU process is a new process and therefore requires a new mechanism to support it.

Figure 1 is a signaling and sending block diagram of the LTE TAU and cell reselection process 100 implemented in a wireless communication system including the WTRU 105, the eNodeB 110, and the EPC network 115.

Figure 2 is an example of a block diagram of the WTRU 105 used to implement the LTE TAU and cell reselection process 100 in Figure 1. The WTRU 105 may include a receiver 205, a processor 210, a transmitter 215, a USIM 220, and at least one antenna 225. The processor 210 may include a NAS protocol stack 120 and an access layer (AS) protocol stack 230. The NAS protocol stack 120 may include GMM 235 or its LTE equivalent unit. The GMM 235 may include a TAU timer 240. The AS protocol stack 230 may include an RRC unit 125, a packetized data convergence protocol (PDCP) unit 245, a radio link control (RLC) unit 250, a medium access control (MAC) unit 255, and a physical layer (PHY) 260.

Fig. 3 is an example of a block diagram of the eNodeB 110 for implementing the LTE TAU and cell reselection process 100 in Fig. 1. The eNodeB 110 may include a receiver 305, a processor 310, a transmitter 315, and at least one antenna 320. The processor 310 may include a self-configuration control unit 325 and an AS protocol stack 330. The AS agreement stack 330 may include an RRC unit 335, a PDCP unit 340, an RLC unit 345, a MAC unit 350, and a PHY 355.

Referring to Figures 1 and 3, when the eNodeB 110 is powered on, the processor 310 detects the connection/link between the eNodeB 310 and the EPC network 115, and determines the main service access gateway (aGW) serving the EPC network 115 (not shown) (Shown), and generate an E-UTRAN parameter request message 130 sent by the transmitter 315 to the EPC network 115 via the antenna 320 of the eNodeB 110 via the determined main serving aGW. The E-UTRAN parameter request message 130 may include information associated with other EPC network connections (except the main serving aGW and the EPC network 115 in the so-called network sharing environment), and the eNodeB 110 and other identified eNodeBs. The information associated with the connection and the radio and channel load capacity of the eNodeB 110.

In response to receiving the E-UTRAN parameter request message 130, the EPC network 115 sends an E-UTRAN parameter response message 135. The parameter response message 135 is received by the receiver 305 of the eNodeB 110, and is subsequently stored in the processor 310. The self-configuration control unit 325 processes. The E-UTRAN parameter response message 135 can include network area division information, such as location or tracking area ID and their operating permission (whether it is prohibited), and the strategy that eNodeB 110 must follow to form a connected EPC network 115 (ie, network). Channel sharing or network node redistribution), and form other connected eNodeBs according to switching and load balancing operation strategies.

In step 140 in Fig. 1, the self-configuration control unit 325 in the processor 310 of the eNodeB 110 instructs the sending action on the EPC network 115, and summarizes the information included in the E-UTRAN parameter response message 135 and Other resource information forms system information for the cell and the associated E-UTRAN. Then, the self-configuration control unit 325 will aggregate the system information and format the SIB (for example, combine/join the network/location area/cell ID into the proposed SIB and other SIBs). The RRC unit 335 in the AS protocol stack 330 of the eNOdeB 110 is responsible for broadcasting system information to the cell, and is also responsible for configuring each independent WTRU 105 in the cell for the relevant running RRC.

Referring now to FIGS. 1-3, the RRC unit 335 in the AS protocol stack 330 of the eNodeB 110 then proceeds to broadcast the channel via the cell via the PHY 355 of the AS protocol stack 330 in the processor 310, the transmitter 315, and the antenna 320 of the eNodeB 110 Broadcast system information to the entire cell (step 145 in Figure 1). Each WTRU 105 (when powered on or moved to a new cell and has been synchronized with the serving cell served by the eNodeB 110) will automatically tune to the cells broadcast channel in a fixed frequency position, code and time configuration, and The PHY 260 via the antenna 225, the receiver 205 and the AS protocol stack 230 starts to read the system information available to all WTRUs in the cell.

In step 150 of Figure 1, the RRC unit 125 of the WTRU 105 receives, processes, stores, and commands the reading of the system information received by the PHY 260 from the receiver 205, for mobility management to the GMM in the NAS protocol stack 120 235 provides relevant information or parameter data, performs LTE cell reselection, and configures PDCP unit 245, RLC unit 250, MAC unit 255, and PHY 260 for LTE E-UTRA data registration and output, and other operations.

In step 155 of Figure 1, based on the received system information, the RRC unit 125 then sends TAC and other information to the GMM 235 in the NAS protocol stack 120 via the internal interface 265 between the AS protocol stack 230 and the NAS protocol stack 120. News.

In step 160 in Figure 1, the NAS protocol stack 120 executes the LTE TAU process. In this process, the GMM 235 in the NAS protocol stack 120 executes the TAC provided by the RRC unit 125 representing the TA-ID of the new cell. Contrast with the existing TAC representing the TA-ID of the previous cell. Note that a single tracking area may cover many cells.

Referring to Figures 1-3, when the TAC indicates that the WTRU 105 is in a different tracking area, the NAS protocol stack 120 in the processor 210 of the WTRU 105 generates a TAU request message 165 that includes the TA-ID of the new cell. The request message 165 is transmitted to the EPC network 115 via the antenna 225 through the transmitter 215. In response to receiving the TAU request message 165, the EPC network 115 sends a TAU accept message 170A or a TAU reject message 170B to the WTRU 105. The TAU accept message 170A or TAU reject message 170B passes through the PHY 260, the MAC unit 255, the RLC unit 250, and the PDCP unit. The 245 and RRC unit 125 are forwarded to the GMM 235 in the NAS protocol stack 120 via the internal interface 265.

The TAU accept message 170A may include the accepted TA-ID and, optionally, other TA-IDs for tracking areas that allow the WTRU 105 to operate in them (to reduce the need to perform additional TAU procedures). Optionally, if the accepted TA-IDs match specific TA-IDs, these accepted TA-IDs can be used to remove the specific TA-IDs stored in the "Forbidden TA-ID List" in GMM 235 .

The TAU rejection message 170B may include a reason/reason for rejection, according to which the operating state of the GMM 235 may be changed. The TAU rejection message 170B may include the TA-ID that was rejected, and optionally a list of other TAs that the WTRU 105 is not allowed to move into. The rejected TA-ID may need to be added to the "Forbidden TA-ID List" stored in the GMM 235, so that the WTRU 105 will not reselect the TA cells associated with these TA-IDs.

The RRC unit 125 in the WTRU 105 will then regularly perform the optimized LTE WTRU cell reselection process 175 assisted by TAC and PLMN-ID. In order to save processing and battery power, cell reselection 175 will not attempt to measure and reselect cells based on the forbidden tracking area (TA-ID).

In LTE, the RRC unit 335 in the eNodeB 110 still provides mobility area management information (ie, PLMN-ID, TAC, and cell ID) to one or more WTRUs 105 by broadcasting system information in the cell. In order to update the LTE TA and provide information for the optimization of WTRU cell reselection regarding PLMN and TA information, the RRC unit 335 combines the mobility area ID and network ID with the cell ID of the service cell and neighboring cells. Combine together to provide a combination of LTE network, TA, and cell to the WTRU. In this way, the TA information and PLMN information to the cell and neighboring cells are combined to form a new LTE system information block or element by the combination of the mobility area, the cell and the network identity. When TA-ID is used for LTE TA update, it needs to be defined and constructed.

The RRC unit 125 in the WTRU 105 receives the system information broadcast by the eNodeB 110, forwards the system information (especially TAC) to the NAS protocol stack 120, and uses the system information (the combination of network ID, TAC and cell ID) to implement the TAU process And assist in the implementation of WTRU cell reselection steps. The NAS protocol stack 120 uses the TAC provided by the RRC unit 125 to perform the LTE TAU procedure.

In LTE, TAC is broadcasted from the LTE system information to the relevant E-UTRAN cell and used for the cell. Since there is also the possibility that one cell can belong to multiple TAs, or one WTRU can register with multiple TAs (one cell belongs to one TA), one or more TACs can be included in the system information broadcast.

Figure 4 shows an example of a TA-ID IE 400 that can be included in a SIB generated by the self-configuration control unit 325 in the processor 310 of the eNodeB 110. The TA-ID IE 400 can also be included in the TAU request message 165 or TAU acceptance/rejection messages 170A and 170B or its counterpart in the EPC network 115 through the NAS protocol stack 120 in the WTRU 105 to perform the LTE TAU process .

As shown in Figure 4, the TA-ID IE 400 may include an encoded 8-bit TA identification IE-ID field 405 and TAC fields 410, 415, and 420, which are provided by the TAC fields 410, 415, and 420 The bit width is up to 24 bits (typically used field width is 16-24 bits). The octet position field 425 is an element type and has mandatory presence (MP), as indicated by the field 430. The fields 432, 434, 436, 438, 440, and 442 represent the components of normal PLMN. The label fields 444, 446, and 448 indicate the octet position of the component (432/434, 436/438, and 440/442) in the TA-ID IE 400. As indicated by field 450, PLMN fields 432-448 have optional presence (OP), where x=1 when PLMN exists, and x=0 if PLMN does not exist. Thus, when PLMN exists (x=1), fields 444, 446, and 448 indicate octet positions 2, 3, and 4. Otherwise, when the PLMN does not exist (x=0), the fields 432-442 do not exist, and since they all indicate octet 1, they will be the same as the field 425, so the fields 444, 446, and 448 are ignored.

For example, if the TAC is unique throughout the entire process, no matter which PLMN the TAC belongs to, the TA-ID is the same as the TAC (see field 450, indicating that the PLMN field does not exist when x=0). If TAC is only allocated by each network operator (ie TAC via PLMN), considering roaming needs, TA-ID=PLMN-ID+TAC (see field 450, indicating that the PLMN field exists when x=1) .

The fields 410 and 415 represent TAC and have MP (corresponding to 16 bits), as indicated by the fields 452 and 454. The field 420 represents the TAC continuation (assuming that its width extends to 24 bits), and has an OP, as indicated by the field 456. For example, if TA-ID IE 400 does not include PLMN, TA-ID IE 400 consists of fields 405, 410, 415, and 420. If the TA-ID includes PLMN, the TA-ID consists of fields 405, 410, 415, 420, mobile country code (MCC) digital fields 432, 434, and 436, and mobile network code (MNC) digital field 440, It is composed of 442 and 444, and these fields are expressed in binary code (BCD) of decimal numbers (that is, a 4-bit field in binary code for numbers 0-9, for example, '1001' represents 9).

Figure 5 shows the LTE SIB (or system information element) 500 used for E-UTRAN TAU and E-UTRAN mobility area identification management information. The E-UTRAN SIB 500 in FIG. 5 is formed by combining the mobility area ID and the available network ID through the eNodeB 115 as a group of E-UTRAN SIB broadcast in the cell. The different IDs and their associations provide static/persistent or long-term association of the network, tracking areas for all neighboring cells that the WTRU 105 may encounter during operation. Note that the adjacent cell information list is independent, and the list is affected by the operating status of the adjacent cells (due to the problem of the EPC network 115 or eNodeB 110, it is sometimes available and sometimes unavailable), and the cell is also It will carry other cell reselection information that is not relevant here.

The E-UTRAN SIB first associates a list with the ID of the service cell. The ID may be a multi-TA associated with the service cell in the "overlapping TA" scheme, or a TA with the "multi-TA registration" scheme, as shown in field 505.

The neighboring cells are then listed by the PLMN-ID and the associated TA-ID classified by the TA-ID first displayed in the TA-ID list of the serving cell.

Information element (IE) list (E-UTRAN mobility area information with adjacent cells in the system information block), and also place the cells (via cell-ID) and similar PLMN-IDs together/adjacent Used to reduce the length of SIB sending. Note that in Figure 5, PLMN-ID and TAC are separated to save space for sending. If TA-ID=PLMN-ID+TAC, the WTRU 105 can construct TA-ID from them. Otherwise, TA-ID=TAC.

The LTE SIB (or System IE) 500 in Figure 5 combines/combines LTE cell-ID, TA-ID (shown as TAC) and PLMN-ID together to provide convenient guidance for WTRU 105 processing, that is, to determine Whether the reselection to a specific neighboring cell should be performed to estimate the neighboring cell with this network/tracking area/cell related information.

The present invention establishes the greatest flexibility in the table content of Figure 5 to adapt to the two complete schemes of TA assigned to cells (ie, "multiple TA registration" and "overlapping TA"), as shown in column 505. For the first "multi-TA" scheme, one serving cell will only be allocated to one TA, but multiple TAs can be allocated to the WTRU at TAU time. For the second "overlapping TA" scheme, the serving cell can be allocated at most TAs, and the value of "maxTAsToACell" in Figure 5 will be one (that is, one TA is allocated to one cell).

Referring to FIG. 5, row 510 indicates the name of the information element/group name. When the information is formatted using the information block/element, the "required" column 515 indicates the existence code (MP/OP) of the component. The "many" column 520 indicates whether multiple identical components/elements (but different values) have been placed to have a one-to-many association. The "Type and Reference" column 525 provides further details/decomposition of the components/elements in other element locations. The "comment" column 530 indicates how to format or process the element.

The LTE SIB (or system IE) 500 shown in Figure 5 has static or non-primary characteristics, where the static means that it does not often change over time, and non-primary means that it does not pass through the main broadcast channel (P -BCH) and broadcast to the service cell through the dynamic broadcast channel (D-BCH). The LTE SIB or system information element should be read by the WTRU 105 in the LTE_IDLE mode, and is mainly used when the WTRU 105 is in the LTE_IDLE state. The LTE SIB is associated with a specific service cell.

When entering a new cell in the LTE_IDLE state, the RRC unit 125 of the WTRU 105 reads the system information block (SIB). Frequent re-reading of the SIB is unnecessary unless the cell indicates the change of this SIB. When the RRC unit 125 in the WTRU 105 has received the LTE system information broadcast about the TAC of the serving cell, the RRC unit 125 can pass the TAC associated with the current serving cell to the NAS protocol stack 120 via the internal interface 265 and make the GMM 235 TAU is processed exclusively, or the TAC listed in the new service cell is detected against the currently used TAC via the previous cell. If one of the new TACs matches the currently used TAC (or the currently registered TA), then the TA limit is not crossed, and no TAU is required. In this way, RRC can only control information. Otherwise, if no TAC matches, the TAC must be abandoned to the NAS protocol stack 120, and the NAS protocol stack 120 is made to perform TAU. The purpose is to reduce the transmission/interaction overhead between the RRC unit 125 and the NAS protocol stack 120.

At the same time, the RRC unit 125 of the WTRU 105 uses the association of the PLMN-ID, TAC, and the Cell-ID broadcast by the SIB in Figure 5 to optimize the WTRU cell reselection measurement, cell reselection arrangement, and decision-making process.

Measurement candidate cells should be sorted together with those cells that are arranged in front: 1) Cells with H-PLMN; and those cells with favorable TACs (favorable TAs are currently registered by the WTRU or overwrite previous cells The TA, the WTRU enters the new cell from the previous cell). Cells with favorable TAC (from the current TA point of view) should be arranged first for measurement scheduling with respect to intra-frequency, inter-frequency or in another radio access technology (RAT) measurement. If the measured signal intensity of cells with favorable TAC and other estimation criteria are approximately the same for cells without favorable TAC, cells with favorable TAC should be arranged higher. The goal is to avoid the reselection of WTRU LTE cells to neighboring cells unnecessarily crossing TA or group TA boundaries and then having to perform unnecessary LTE TAU.

If the TA input through the WTRU 105 does not belong to the list of prohibited TAs, the GMM 235 of the NAS protocol stack 120 in the WTRU 105 will perform TAU related operations. The forbidden TA list determines one or more TAs that the WTRU is not allowed to move in. When the WTRU 105 is powered off, the list can optionally be saved in the USIM 220 of the WTRU 105. When the WTRU is powered on, the list is downloaded into GMM 235. The list can be modified through TAU accept message 170A or TAU reject message 170B.

Detected tracking area change: If none of the TAC or multiple TACs forwarded by RRC matches the current TAC or TA-ID, the TA-ID accepts the message through the previous TAU or from the beginning of the WTRU 105 power-on The TA-ID retrieved by the USIM 220 is authorized, and the NAS protocol stack 120 in the WTRU 105 will initiate a TAU request or attach effort to report its TA location to the EPC network 115.

Periodic TAU: If the TAU timer 240 in the WTRU 105 indicates that the time period established to perform periodic TAU has expired, the NAS protocol stack 120 in the WTRU 105 triggers TAU to the EPC network 115. When the WTRU 105 is in the LTE_IDLE state, the TAU timer 240 may, for example, be set in the range of 12 to 15 minutes or other values. If the TAU rejection message 170B is received, in order to register with another TA to receive a page, the subsequent TAU request is managed by setting the TAU timer 240 to a shorter range of 10-15 seconds or other values.

In TAU, the WTRU 105 can also update the EPC network 115 with its radio access and/or security capabilities. The WTRU 105 may agree to discontinuous reception (DRX) or update of the connection context with the EPC network 115 (such as a packet data protocol (PDP) context). DRX is a parameter that determines the frequency at which the WTRU 105 in idle mode should be aware of monitoring the paging channel for possible incoming calls. Note that the login of the prohibited TA list has two sources: the USIM device 220 and the TAU rejection message 170B. If the EPC network 115 does not allow the WTRU 105 to obtain service from the reported tracking area, a TAU rejection message 170B is sent to the WTRU 105. If it is also necessary to guide the WTRU 105 to make a cell reselection selection, the TAU reject message 170B may include one or more IDs that reject the TA. The rejected TA-ID is added to the list of prohibited TAs.

Example

1. An evolved node B (eNodeB), the eNodeB comprising: at least one antenna; a transmitter coupled to the antenna, the transmitter configured to transmit an enhanced universal terrestrial radio access network (E-UTRAN) via the antenna ) A parameter request message; a receiver coupled to an antenna configured to receive an E-UTRAN parameter response message via the antenna; and a processor coupled to the receiver and the transmitter, the processor being configured to include The information in the E-UTRAN parameter response message and other resource information are summarized to generate system information including at least one system information block (SIB), and the system information is forwarded to the transmitter via the antenna for transmission.

2. The eNodeB according to embodiment 1, wherein the processor comprises: a self-configuration control unit; and an access layer (AS) protocol stack coupled to the self-configuration control unit.

3. The eNodeB according to embodiment 2, wherein the AS protocol stack includes: a radio resource control (RRC) unit; a packet data convergence protocol (PDCP) unit coupled to the RRC unit; and a radio coupled to the RRC unit and the PDCP unit Link control (RLC) unit; medium access control (MAC) unit coupled to RLC unit and RRC unit; and physical layer (PHY) coupled to RRC unit and MAC unit.

4. The eNodeB according to embodiment 3, wherein the RRC unit is configured to broadcast system information to a cell, a plurality of wireless transmission/reception units operate in the cell, and the RRC unit is also responsible for related The running RRC configures each independent WTRU in the cell.

5. The eNodeB according to embodiment 4, wherein the RRC unit is configured to broadcast system information on a broadcast channel of the cell via a PHY, a transmitter, and an antenna.

6. The eNodeB according to any one of embodiments 1-5, wherein the E-UTRAN parameter request message includes information related to an Evolved Packet Core (EPC) network connection.

7. The eNodeB according to any one of embodiments 1-5, wherein the E-UTRAN parameter request message includes information related to the connection between the eNodeB and other determined eNodeBs.

8. The eNodeB according to any one of embodiments 1-5, wherein the E-UTRAN parameter request message includes associated information and radio and channel load capabilities of the eNodeB.

9. The eNodeB according to any one of embodiments 1-5, wherein the E-UTRAN parameter response message includes network area division information.

10. The eNodeB according to any one of the embodiments 1-5, wherein the E-UTRAN parameter response message includes a location area identifier and an operation permission of the location area identifier.

11. The eNodeB according to any one of embodiments 1-5, wherein the E-UTRAN parameter response message contains information associated with a policy, and the eNodeB must comply with the policy to target the connected evolved packets A core (EPC) network that sends an E-UTRAN parameter response message in response to receiving an E-UTRAN parameter request message.

12. The eNodeB according to any one of embodiments 1-5, wherein the E-UTRAN parameter response message includes information related to handover and load balancing operation strategies.

13. The eNodeB according to any one of embodiments 1-12, wherein the SIB includes a tracking area identification (TA-ID) information element (IE).

14. The eNodeB according to embodiment 13, wherein the TA-ID IE includes a TA-ID IE identification field, a plurality of TA code (TAC) fields, and a plurality of fields indicating whether a public land mobile network (PLMN) exists or not. Fields.

15. A wireless transmission/reception unit (WTRU), the WTRU comprising: at least one antenna; a receiver coupled to the antenna, the receiver configured to receive system information including at least one system information block (SIB) via the antenna; coupling To the processor of the receiver, the processor is configured to generate a new tracking area code (TAC) representing the tracking area identification (TA-ID) of the new cell based on the received system information, and combine the new TAC with The current TAC representing the TA-ID of the previous cell is compared, and a tracking area update (TAU) request message containing the TA-ID of the new cell is generated; and a transmitter for transmitting via the antenna The TAU request message.

16. The WTRU of embodiment 15, wherein the processor includes: a non-access stratum (NAS) protocol stack; and an access stratum (AS) protocol stack coupled to the NAS protocol stack.

17. The WTRU of embodiment 16, wherein the AS protocol stack includes: a radio resource control (RRC) unit; a packet data convergence protocol (PDCP) unit coupled to the RRC unit; and a radio coupled to the RRC unit and the PDCP unit Link control (RLC) unit; medium access control (MAC) unit coupled to RLC unit and RRC unit; and physical layer (PHY) coupled to RRC unit and MAC unit.

18. The WTRU of embodiment 16, wherein the NAS protocol stack includes a General Packet Radio Service (GPRS) Mobility Manager (GMM), the GPRS GMM including a TAU timer.

19. The WTRU of embodiment 18, the WTRU further comprising a universal mobile telecommunications system (UMTS) subscriber identity module (USIM) coupled to the processor, wherein when the WTRU is powered on, the UMTS stores A list of prohibited TA-IDs loaded into GMM.

20. The WTRU of embodiment 19, wherein the receiver is further configured to receive a TAU accept message or a TAU reject message.

21. The WTRU of embodiment 20, wherein the TAU accept message includes at least one acceptable TA-ID for a tracking area within which the WTRU is allowed to operate.

22. The WTRU of embodiment 21, wherein if the acceptable TA-ID matches a specific TA-ID in a list of forbidden TA-IDs stored in GMM, then the acceptable TA-ID Used to remove the specific TA-ID.

23. The WTRU of embodiment 20, wherein the TAU rejection message indicates the reason why the TA-ID of the new cell is rejected.

24. The WTRU of embodiment 23, wherein the TAU rejection message includes a list of rejected TA-IDs and other prohibited TA-IDs.

25. The WTRU of embodiment 24, wherein the other forbidden TA-IDs are added to a loading list in GMM.

26. The WTRU according to embodiment 17, wherein the RRC unit regularly executes the Long Term Evolution (LTE) WTRU cell reselection process assisted by TAC and Public Land Mobile Network Identification (PLMN-ID), thereby Perform cell reselection for the cell based on the forbidden TA-ID to save processing and battery power.

27. The WTRU of embodiment 18, wherein if the TAU timer indicates that the time period established to perform periodic TAU has expired, the NAS protocol stack triggers TAU.

28. The WTRU according to embodiment 27, wherein when the WTRU is in the LTE_IDLE state, the TAU timer is set to the first time period, and if the TAU reject message is received, in order to register with another tracking area to receive paging, Subsequent TAU requests are managed by setting the TAU timer to a second time period that is substantially shorter than the first time period.

29. A long-term evolution (LTE) wireless communication system, the system comprising: an evolved node B (eNodeB) configured to transmit an enhanced universal terrestrial radio access network (E-UTRAN) parameter request message; an evolved type A packet core (EPC) network configured to send an E-UTRAN parameter response message to the eNodeB in response to receiving an E-UTRAN parameter request message from the eNodeB; and a wireless transmission/reception unit (WTRU), the WTRU including : A receiver configured to receive system information including at least one system information block (SIB) from the eNodeB, the system information being generated by the eNodeB at least in part based on the E-UTRAN parameter response message; the processor, the processor It is configured to generate a new tracking area code (TAC) representing the tracking area identification (TA-ID) of the new cell based on the received system information, and combine the new TAC with the TA representing the previous cell. -IDs current TAC comparison; and a transmitter configured to transmit a tracking area update (TAU) request message containing the TA-ID of the new cell to the EPC network, wherein the EPC network responds to The TAU request message sends a TAU accept message or a TAU reject message to the WTRU.

30. The LTE wireless communication system according to embodiment 29, wherein the processor comprises: a non-access stratum (NAS) protocol stack; and an access stratum (AS) protocol stack coupled to the NAS protocol stack.

31. The LTE wireless communication system according to embodiment 30, wherein the AS protocol stack includes: a radio resource control (RRC) unit; a packetized data convergence protocol (PDCP) unit coupled to the RRC unit; coupled to the RRC unit and PDCP The radio link control (RLC) unit of the unit; the medium access control (MAC) unit coupled to the RLC unit and the RRC unit; and the physical layer (PHY) coupled to the RRC unit and the MAC unit.

32. The LTE wireless communication system according to embodiment 31, wherein the NAS protocol stack includes a General Packet Radio Service (GPRS) Mobility Manager (GMM), and the GPRS GMM includes a TAU timer.

33. The LTE wireless communication system of embodiment 32, wherein the WTRU further includes a universal mobile telecommunications system (UMTS) subscriber identity module (USIM) coupled to the processor, wherein when the WTRU is powered on, the UMTS stores a list of prohibited TA-IDs loaded into GMM.

34. The LTE wireless communication system according to embodiment 33, wherein the TAU accept message includes at least one acceptable TA-ID for a tracking area within which the WTRU is allowed to operate.

35. The LTE wireless communication system according to embodiment 34, wherein if the acceptable TA-ID matches a specific TA-ID in the forbidden TA-ID list stored in the GMM, the acceptable TA-ID The ID is used to remove the specific TA-ID.

36. The LTE wireless communication system according to embodiment 33, wherein the TAU rejection message indicates the reason why the TA-ID of the new cell is rejected.

37. The LTE wireless communication system according to embodiment 36, wherein the TAU rejection message includes a list of rejected TA-IDs and other prohibited TA-IDs.

38. The LTE wireless communication system according to embodiment 37, wherein the other prohibited TA-IDs are added to the loading list in GMM.

39. The LTE wireless communication system according to embodiment 37, wherein the RRC unit regularly executes the Long Term Evolution (LTE) WTRU cell reselection process optimized by TAC and Public Land Mobile Network Identity (PLMN-ID) , Thereby performing cell reselection for the cell based on the forbidden TA-ID to save processing and battery power.

40. A method for updating a tracking area for a wireless transmission/receiving unit (WTRU), the method comprising: transmitting an enhanced universal terrestrial radio access network (E-UTRAN) parameter request message; responding to the E-UTRAN parameter request Message to receive an E-UTRAN parameter response message; generate a system message including at least one system information block (SIB) based at least in part on the E-UTRAN parameter response message; generate a representative new message based on the system message The new tracking area code (TAC) of the tracking area identifier (TA-ID) of the cell; compare the new TAC with the current TAC, the current TAC representing the TA-ID of the previous cell; and the transmission contains the new The tracking area update (TAU) request message of the TA-ID of the cell.

41. The method of embodiment 40, further comprising: receiving a TAU accept message in response to the TAU request message, the TAU accept message including at least one acceptable TA-ID for tracking the area, and the WTRU is allowed to Run within the tracking area.

42. The method according to embodiment 41, the method further comprising: loading a list of prohibited TA-IDs in the memory; determining whether the acceptable TA-ID is the same as the specific TA-ID in the prohibited TA-ID list. ID matching; and if the acceptable TA-ID matches a specific TA-ID, remove the specific TA-ID from the list of forbidden TA-IDs.

43. The method of embodiment 40, further comprising: receiving a TAU rejection message in response to the TAU request message, the TAU rejection message including at least one rejected TA-ID for which the WTRU is not allowed to operate.

44. The method according to embodiment 43, the method further comprising: loading a list of prohibited TA-IDs in the memory; determining whether the rejected TA-ID is the same as any TA in the prohibited TA-ID list -ID matching; and if the rejected TA-ID does not match any TA-ID in the forbidden TA-ID list, then the rejected TA-ID is added to the forbidden TA-ID list.

45. The method according to embodiment 44, the method further comprising: regularly performing long-term evolution (LTE) WTRU cell reselection process assisted by TAC and public land mobile network identification (PLMN-ID), thereby Perform cell reselection for the cell based on the forbidden TA-ID to save processing and battery power.

Although the features and elements of the present invention are described in a specific combination in the best embodiment, each feature or element can be used alone without other features and elements of the best embodiment, or in Used in various situations with or without combining with other features and elements of the present invention. The method or flowchart provided by the present invention can be implemented in a computer program, software, or firmware executed by a general-purpose computer or processor, wherein the computer program, software, or firmware is included in a computer-readable storage medium in a tangible manner middle. Examples of computer-readable storage media include read-only memory (ROM), random access memory (RAM), temporary memory, cache memory, semiconductor storage devices, internal hard drives, and removable disks. Magnetic media, magneto-optical media, and optical media such as CD-ROM discs and digital versatile discs (DVD).

For example, suitable processors include: general-purpose processors, special-purpose processors, conventional processors, digital signal processors (DSP), multiple microprocessors, one or more microprocessors associated with the DSP core, Controller, microcontroller, dedicated integrated circuit (ASIC), field programmable gate array (FPGA) circuit, any kind of integrated circuit (IC) and/or state machine.

The processor associated with the software can be used to implement a radio frequency transceiver for the wireless transmission and reception unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC) or any host computer To be used in. WTRU can be used in combination with modules implemented in hardware and/or software, such as cameras, camera modules, video phones, speaker phones, vibration devices, speakers, microphones, TV transceivers, hands-free headsets, keyboards, Bluetooth<img file="TWI474697B_D0004.tif" he="48" id="i0004" img-content="character" img-format="tif" inline="no" orientation="portrait" wi="47" />Module, frequency modulation (FM) wireless unit, liquid crystal display (LCD) display unit, organic light emitting diode (OLED) display unit, digital music player, media player, video game console module, Internet browser And/or any wireless local area network (WLAN) module.

<p>100. . . Cell reselection process</p><p>105. WTRU. . . Wireless transmission/receiving unit</p><p>110. eNodeB. . . Evolved Node B</p><p>115. . . EPC network</p><p>120. . . NAS protocol stack</p><p>125, 335. . . RRC unit</p><p>130. . . E-UTRAN parameter request message</p><p>135. . . E-UTRAN parameter response message</p><p>165. . . TAU request message</p><p>170A. . . TAU accepts the message</p><p>170B. . . TAU rejection message</p><p>175. . . Optimized LTE WTRU cell reselection process assisted by TAC and PLMN-ID</p><p>205, 305. . . Receiver</p><p>210, 310. . . processor</p><p>215, 315. . . Conveyor</p><p>220, USIM. . . User identification module</p><p>225, 320. . . antenna</p><p>230, 330. . . Access layer (AS) protocol stack</p><p>235, GMM. . . Mobility Manager</p><p>240. . . TAU timer</p><p>245, 340. . . Packet Data Convergence Protocol (PDCP) unit</p><p>250, 345. . . Radio Link Control (RLC) unit</p><p>255, 350. . . Media Access Control (MAC) Unit</p><p>260, 355. . . Physical layer (PHY)</p><p>265. . . Internal interface</p><p>325. . . Self-configuring control unit</p><p>400. . . TA-ID IE</p><p>405. . . TA identifies the IE-ID field</p><p>410, 415, 420. . . TAC field</p><p>430, 452, 454. . . Mandatory presence (MP)</p><p>444, 446, 448. . . Flag field</p><p>450, 456. . . Optional presence (OP)</p><p>500. . . LTE SIB (or system information element)</p><p>EPC. . . Evolutionary packet core</p><p>NAS. . . Non-access layer</p><p>RRC. . . Radio resource control</p><p>E-UTRAN. . . Enhanced Universal Terrestrial Radio Access Network</p><p>TAU. . . Tracking area update</p><p>TAC. . . Tracking area code</p><p>PLMN-ID. . . Public land mobile network identification</p><p>LTE. . . Long-term evolution</p><p>UMTS. . . Universal Mobile Telecommunications System</p><p>TA-ID. . . Tracking area identification</p><p>IE. . . Information element</p><p>432, 434, 436, 438, 440, 442. . . Mobile country code (MCC) numeric field</p>

With reference to the drawings, the previous summary and the following detailed description can be better understood, in which:

Figure 1 is a signaling block diagram of the LTE TAU and cell reselection process implemented in a wireless communication system including eNodeB, EPC network and WTRU;

Figure 2 is an example of a block diagram of a WTRU used to implement the LTE TAU and cell reselection process in Figure 1;

Figure 3 is an example of a block diagram of an eNodeB used to implement the LTE TAU and cell reselection process in Figure 1;

Figure 4 shows an example of the TA-ID Information Element (IE) included in the SIB transmitted by the eNodeB in Figure 3;

Figure 5 shows an example of LTE system information blocks/elements transmitted by the eNodeB in Figure 3.