Method and apparatus for enhanced paging

Technical field [0001] The present invention generally relates to communication, and in particular to techniques for paging user equipment (UE) in a wireless communication system.

II. Background [0002]

A UE in a wireless communication system (e.g., a cellular telephone in a cellular system) may at one time operate in one of several states, such as active state and sleep state. In the active state, the UE may actively exchange data with one or more Node B (or base stations), e.g. for voice or data connections. In the sleep state, the UE may be turned off most of the time to save battery power and may wake up periodically to monitor paging messages sent to the UE. The paging messages may alert the UE to the presence of an incoming call or may provide other information.

[0003] The wireless communication system uses radio resources to support paging. For example, the system may send paging indicators on the paging indicator channel (PICH) to indicate whether paging messages are being sent to UEs. The system may also send paging messages to UEs on the paging channel (PCH). The UE may quickly receive paging indicators,

Determine if a paging message is sent to the UE and either processes the PCH channel, if the paging message is sent or returns to sleep immediately, if no paging messages have been sent to the UE. The PICH and PCH channels are redundant channels that are used for all UE users' devices. Hence, these redundant channels are usually sent at a sufficiently low transmission rate and with sufficient transmission power that even the most disadvantaged UE user device with the worst channel conditions can reliably receive paging indicators and paging messages. In addition, because the locations of the UEs being recalled may not be known, the system typically sends paging indicators and paging messages from all cells in a wide area. Sending paging indicators and paging messages on redundant channels in a wide area with low transmission speed and / or high transmission power may use significant radio resources. Document US-A-2004/091 022 relates to a CDMA system that uses a hash function to transmit paging indicator bits based on IMSI_S numbers of remote units prone to collisions.

[0004] There is therefore a need for techniques for efficiently paging UE users' devices.

SUMMARY OF THE INVENTION [0005] This document describes techniques for paging UEs in a wireless communication system.

[0006] According to the invention, the cell sends a paging indicator on a shared control channel to the UE and sends a paging message in the

53 / 59P29579EN00 shared data channel to the UE. The paging indicator and the paging message may be sent from multiple cells to the UE. Alternatively, the paging indicator may be sent from multiple cells to the UE and the paging message may be sent from a single cell to the UE. The cell may send paging indicator and possibly UE device identification information. The UE information identifying the UE identifies the UE as the intended recipient of the paging indicator and may include all or part of the UE user identifier that uniquely identifies the UE. The cell sends a paging message to the UE, if a paging indicator acknowledgment is received from the UE. The cell may receive channel quality information from the UE and may send a link adaption message and / or hybrid automatic retransmission (HARQ) to improve performance.

[0007] Various forms and features of the invention are described in more detail below. The invention is defined in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS [0008] Fig. 1 shows a wireless communication system.

[0009] Fig. 2 shows a frame format construction.

[0010] Fig. 3 is a time waveform for a UE in DRX mode.

[0011] Fig. 4 shows the logical, transport and physical downlink channel structure.

[0012] Fig. 5 shows the structure of a logical, transport and physical uplink.

[0013] Fig. 6 shows a paging procedure that uses shared channels for paging.

[0014] Fig. 7 is a paging procedure that sends a paging message from a single cell.

[0015] Figure 8 shows a structure for implicitly sending a paging indicator.

[0016] Fig. 9 is a structure for reproducing an implicit paging indicator.

[0017] Fig. 10 is a process performed by a cell to recall a UE.

[0018] Fig. 11 is a device for paging UEs.

[0019] Fig. 12 shows the process performed by the UE in order to receive paging. [0020] Fig. 13 shows a paging receiving device.

[0021] Fig. 14 shows another process performed by a cell to recall a UE.

[0022] Fig. 15 is another device for paging UEs.

[0023] Fig. 16 shows the process performed by the network unit for paging.

[0024] Fig. 17 shows a paging device. [0025] Fig. 18 is a process of sending an implicit paging indicator.

[0026] Fig. 19 is a device for sending an implicit paging indicator.

[0027] Fig. 20 is a block diagram of a UE, Node B and system controller.

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DETAILED DESCRIPTION by division [0028] The paging techniques described in this document can be used in various communication systems, such as Code Multiple Access Systems (CDMA), Frequency Multi Access Access Systems (FDMA), Time Division Multiple Access Systems (TDMA), Multiple Access Systems with division into orthogonal frequencies (OFDMA), single-carrier FDMA systems (SCFDMA) and others. The terms "systems" and "networks" are often used interchangeably. The CDMA system can utilize radio technology such as broadband CDMA (W-CDMA), cdma2000 and others. Cdma2000 technology includes IS-95, IS-2000 and IS-856 standards. The TDMA system can use radio technology such as the Global Mobile Communication System (GSM). These various radio technologies, standards and systems are known in the art. The OFDMA system uses orthogonal frequency division multiplexing (OFDM) and sends frequency modulation symbols on orthogonal subcarriers. The SCFDMA system uses frequency division multiplexing with single carrier modulation symbols in the orthogonal time domain. For clarity, described below for a wireless communication system that uses long-term evolution technology (Long Term

Evolution - LTE), which is being developed radio technology. However, paging techniques can also be used for various other wireless communication systems.

[0029] Figure 1 shows a wireless communication system 100 with multiple Node B 110. The Node B is essentially a stationary station that communicates with UEs and can also be referred to as a base station, an expanded Node B (eNode B), access point and the like. Each Node B 110 provides communication range for

SC-FDM) and sends on subcarriers paging techniques

53 / 59P29579EN00 specific geographical area. The term "cell" may refer to Node B and / or its coverage area, depending on the context in which the term is used. To improve system performance, the Node B coverage area can be divided into many smaller areas, such as three smaller areas. Any smaller areas can be served by the appropriate base receiver transmitter (BTS) subsystem. The term 'sector' may refer to BTS and / or its coverage area, depending on the context in which the term is used. For a cell divided into sectors, BTS stations for all sectors of this cell are usually co-located within the Node B for the cell.

[0030] UE 120 devices may be distributed throughout the system. The UE may be stationary or mobile and may also be referred to as a mobile station, mobile device, terminal, access terminal, station and the like. The UE may be a mobile phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, subscriber unit and others. The UE may communicate with one or more Node B via transmission on the forward link or reverse link. The term forward link (or forward link) refers to a communication link from Node B to UEs, and the term reverse link (or reverse link) refers to a communication link from UEs to Node B. In Fig. 1 a solid line with double arrows indicates data exchange between the Node B and UEs in active state. The dashed line with a single arrow indicates the UE's sleep device and receiving paging messages and / or other information. The user equipment may be served by a specific Node B, which is referred to as a serving cell for the UE.

The system controller 130 may connect to Nodes B 110 and provide coordination and control for these Nodes B. The system controller 130 may be a single network entity or a set of network entities. The system controller 130 may also be referred to as a radio network controller (RNC), digital telephone exchange (MSC) and the like.

[0032] Fig. 2 shows the structure of the frame format 200 for the system 100. The transmission time course can be divided into radio frames. Each radio frame can be identified by a system frame number (SFN) and can have a predetermined duration, for example 10 milliseconds (ms). Each radio frame may be divided into many (N) subframes, for example N = 20, or may have a different value. In principle, radio frames and subframes can have any duration and can also be referred to by other names, e.g. frames, slots etc.

[0033] Fig. 3 is a time waveform 300 for a UE in a DRX discontinuous reception mode. DRX mode can also be referred to as slotted mode paging. In DRX mode, UEs are assigned paging occasions, which are periods of time during which the UE may receive calls. Each paging occasion can correspond to a specific time frame, a specific subframe of a specific radio frame, etc. Paging occasions may also be referred to as paging periods, paging frames, paging subframes, etc. Paging occasions for a UE may be separated by a time interval referred to as a DRX cycle. The DRX cycle may be configurable for the UE. Paging occasions for UEs may be determined based on parameters such as, for example, UEs specific identifier (UE IDs).

[0034] The UE may periodically wake up before its paging occasions to receive any paging messages sent to the UE. Paging messages are also referred to as paging messages, paging messages, etc. Paging messages are not sent to the UE of the user outside of his paging occasions. The user's device may thus be put to sleep in the period between his paging occasions if there are no other tasks to perform. The UE may turn off as many systems as possible in sleep mode in order to save battery power.

[0035] System 100 may use logical channels, transport channels, and physical channels to support various services. The medium access control layer (MAC) can provide data transfer services on logical channels. Different types of logical channel can be defined for different types of data transfer services, and each type of logical channel can carry a different type of information. The MAC layer may map logical channels to transport channels and may process (e.g., encode and modulate) data from the logical channel to generate MAC protocol data units (PDUs). The physical layer (PHY) can map transport channels to physical channels and can process (e.g., split into channels and encrypt) MAC PDUs to generate output data for physical channels.

[0036] Fig. 4 shows the logical, transport and physical channel structure for the forward link (DL). In this design, the forward link logical channels contain:

- broadcast control channel (BBCH) - carrying system control information,

- dedicated traffic channel (DTCH) - carrying user information for a specific UE,

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- dedicated control channel (DCCH) - carrying control information for a specific UE,

- MBMS traffic channel (MTCH) - carrying traffic data for many UEs,

- MBMS control channel (MCCH) - carrying information about scheduling and control for MTCH channels, where the abbreviation MBMS stands for Multimedia and Broadcast Mobile Services [0037] Forward link transport channels include:

- broadcast channel (BCH) - carrying part of the BCCH channel, while

- DL shared data channel (DL-SDCH) - carrying DCCH, DTCH, MCCH, MTCH and part of the BCCH channel.

There may be another transport channel for MBMS traffic and control on the MBMS channel (MCH).

[0038] The forward link physical channels include:

- common control channel (CCCH) - carrying system and cell parameters to demodulate other physical parameters and also carrying a BCH channel,

- confirmation channel (ACKCH) - carrying confirmation (ACK) / negative confirmation (NAK) for UL-SDCH,

<td>- shared physical</td><td>data channel</td><td>DL</td><td>(DL-PSDCH) -</td><td>carrying</td>

<td>DL-SDCH channel,</td><td></td><td></td><td></td><td></td>

<td>- shared channel</td><td>control</td><td>DL</td><td>(SDCCH) -</td><td>carrying</td>

<td>control information for</td><td colspan="2">DL-PSDCH channel,</td><td>and</td><td></td>

<td>- shared channel</td><td>assignment</td><td>UL</td><td>(SUACH) -</td><td>carrying</td>

PHY physical resource assignment UL.

PHY physical resources refer to the resources used for physical channels. PHY physical resources can be quantified by frequency (e.g., subcarriers), time (e.g., time intervals), code (e.g., channel split codes), space (e.g., transmission antennas), transmission power, etc.

[0039] Figure 4 also shows mapping of logical channels to transport channels and channel mapping

53 / 59P29579EN00 to physical channels. Some of the transport and physical channels of the forward link are described in more detail below.

[0040] Fig. 5 is a logic, transport, and physical reverse link (UL) channel structure. In this design, the reverse link logic channels include DCCH and DTCH. Reverse link transport channels include:

- random access channel (RACH) - carrying access requests and possibly other information, as well

- UL shared data channel (UL-SDCH) - carrying DCCH and DTCH channels.

Depending on the information carried on the RACH random access channel, the RACH channel can only be considered a physical channel.

[0041] Reverse link physical channels include:

- Physical random access channel (PRACH) - carrying the RACH channel,

- shared UL physical data channel (UL-PSDCH) carrying the UL-SDCH,

- confirmation channel (ACKCH) - carrying the ACK / NAK confirmation for the DL-SDCH channel, as well as

- channel quality indicator channel (CQICH) - carrying CQI for DL ​​signal quality.

[0042] Fig. 5 also shows mapping of logical channels to transport channels and mapping of transport channels to physical channels. Some of the uplink transport and physical channels are described in more detail below.

[0043] Figs. 4 and 5 show specific designs of downlink and uplink channels that are referred to in the description below. Basically, the system can support any number and any type of logical, transport and physical channels for each link, for example

Smaller number, greater number and / or other channels than those mentioned above. Logical, transport and physical channels can also be mapped in other ways.

[0044] The UE may register with the system and may "camp" in the serving cell when it is not in active communication mode. At the time of registration, the UE is located within the serving cell cover and is also within the paging area that includes the serving and adjacent cell cells

Referring to Fig. 1, the serving cell for UE 120x user equipment may be a Node B 110x, and the paging area of ​​UE 120x user equipment may include seven cells surrounded by a thick, dashed line. Depending on the configuration, the UE may perform a cell update whenever the UE is moving to a new cell or paging area update whenever the UE is moving to a new paging area.

[0045] Fig. 6 is a construction of a paging procedure 600 that uses shared paging channels. The UE may camp in a serving cell and may wake up periodically to monitor paging, as for example shown in Fig.

3. The exact location of the UE may not be known at any time. For example, the UE may be able to move to a new cell while in sleep mode between paging occasions. Thus, when the system has a paging for the UE, the serving cell and other cells in the paging area of ​​the UE may send a paging indent and possibly UE identification information (UE ID info) to the UE (step 612 ). UE user identification information

53 / 59P29579EN00 identifies the paged UE and may include the full or partial UE ID and / or other information. The UE ID may be a temporary radio network identifier (RNTI), international mobile subscriber identifier (IMSI), MAC ID, etc. The RNTI is the unique UE ID of the system in the system. The paging indicator and UE identification information may be sent on the SDCCH as described below. The serving cell and other cells in the paging area may also send a paging message on the DL-SDCH to the UE (step 614). Sending the paging indicator and the paging message from all cells in the paging area of ​​the UE is increasing the likelihood that the UE will be able to receive the paging message when the location of the UE is not known exactly.

[0046] The cells can send the paging indicator and the paging message in a manner that is known in advance, so after receiving the paging indicator, the UE will know where the paging message was sent on the DL-SDCH and how to decode the paging message. For example, each paging indicator sent on an SDCCH may be associated with a paging message sent on a DL-SDCH using a predetermined modulation and coding scheme (MCS) and predetermined PHY physical resources. In this case, no control information for the paging message sent on the DL-SDCH may be sent on the SDCCH. Alternatively, control information may be sent on the SDCCH to indicate where

53 / 59P29579EN00 and / or how to play the page message on the DLSDCH.

[0047] The UE may receive the page message from the DL-SDCH and may respond to the page message by performing random access and performing the transmission on the RACH (step 616). The RACH transmission may include acknowledgment for the paging message, channel quality information specifying the forward link channel quality, reverse link PHY physical resource request, etc. In general, any cell in the paging area of ​​the UE may receive the transmission on the RACH depending on the current location of the UE. In one design, the cell that receives the RACH transmission may respond to the UE and perform the processing described below. In another design, the UE may route transmission on the RACH to a specific cell, e.g., using a "signature" or base sequence corresponding to the selected cell. The selected cell may then perform the processing described below if it can successfully receive the RACH transmission. In the following description it is assumed that the serving cell receives the transmission on the RACH channel.

[0048] The serving cell receives the RACH transmission and may respond by sending an assignment on the SUACH (step 618). The SUACH transmission may include the UE UE's MAC ID, time warping to match the transmission timing for the UE, PHY physical resource assignment for ACKCH, CQICH and / or UL-SDCH etc. The MAC ID may be assigned to the UE during exchange after initial recall and may be used to identify the transmission on the DL-SDCH. Assignment of ACKCH and / or CQICH may also be implicit and not sent on SUACH.

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For example, PHY physical resources for the ACKCH may be implicit from DL-SDCH transmission. User device

The UE may then send channel quality information on the channel

CQICH and / or acknowledgment on the ACKCH (step 620).

[0049] For data transmission on the forward link, the serving cell may send control information on the SDCCH (step 622) and may send data on the DL-SDCH (step 624) in normal / normal mode. The control information sent on the SDCCH may contain various types of information, such as the MAC ID of the destination UE for data transmission on the DL-SDCH, MCS, resource allocation as well as the transmission time interval (TTI) for data transmission etc. Data transmission can be carried out using hybrid automatic retransmission (HARQ), with link adaptation etc. In the case of HARQ, the transmitter performs transmission for the packet and can perform one or more retransmission, if necessary, until the packet is correctly decoded by the receiver or the maximum number of retransmissions will be sent or some other interrupt condition will occur. HARQ technique can improve the reliability of data transmission. Link adaptation may include baud rate control, power control, etc. Baud rate control refers to the selection of the coding scheme and modulation so that the packet can obtain the desired performance metric. This metric can be quantified, for example, by the target probability of correct decoding after the target number of retransmissions using HARQ. Power control refers to adjusting the transmission power to achieve the target quality of the received signal while reducing transmission power and interference. The serving cell may use the channel quality information received in step 620 for link adaptation and may select the MCS and / or the transmission power level based on the received information.

[0050] In the construction shown in Fig. 6, paging is supported using a shared control channel and a shared data channel that are shared by UEs and are also used for different types of data. For example, the DL-SDCH may carry user traffic data (DTCH) and user control information (DCCH) for specific UEs, broadcast data (MTCH) and spread control information (MCCH) for many UEs, etc. It avoids this design use of a separate paging indicator channel. a separate paging channel (PCH) paging. The use of a shared control channel and data channel for paging may have some advantages, such as simpler implementation in the UE and / or cells, better use of PHY physical resources through multiplexing, no fixed excess (e.g. for the paging indicator channel that is used in W-CDMA and cdma2000 technologies) etc.

[0051] Fig. 7 is a construction of paging procedure 700 in which a paging message is sent from a specific cell. The UE may camp in a serving cell and may monitor paging. When the UE, the serving cell and other cells in the paging area of ​​the UE, send the paging indicator and possibly UE identification information on the SDCCH to the UE (step 712). The UE may receive the paging indicator and may respond to the paging indicator by performing random access and performing the transmission on the RACH (step 714). Transmission in (PICH) and for service to wake up periodically in order the system has recall for the RACH channel may include paging, confirmation information for the channel quality indicator and / or other

53 / 59P29579EN00 information. RACH transmission may or may not include uplink PHY physical resource requests on UL-SDCH. Trance RACH mission is used to acknowledge receipt of a paging indicator and to provide the current location of the UE. In particular, the current location of the UE may be determined based on the cell (s) that are receiving the RACH transmission. In general, any cell in the paging area may receive the RACH transmission, and the cell that receives the RACH transmission or the cell selected by the UE may correspond to the UE. The following description assumes that the serving cell receives the transmission on the RACH channel.

[0052] The serving cell responds to the transmission on the RACH channel by sending an assignment on the SUACH channel (step 716). The SUACH transmission may include the UE's MAC ID, adaptation of the time course for the UE, the assignment of PHY physical resources for the ACKCH and / or CQICH channel, etc. The MAC ID sent in step 716 may be used as the user's device ID EU in an active state. The UE user device identifier in step 712 may be obtained from the RNTI or IMSI identifier and may be used as the UE user device identifier in the inactive state. Assignment of ACK and / or CQI confirmation may also be implicit and not sent on SUACH. The UE may then send channel quality information on the CQICH (step 718). Step 718 may be skipped, e.g., if the channel quality information is sent on the RACH channel in step 714. The serving cell may use the channel quality information to adapt the link and may select the MCS scheme and / or the transmission power level for transmission to a UE based device based on

Received information. The serving cell sends control information of the SDCCH channel (step 720 sends a paging message on the DL-SDCH channel to the UE may send a message like other types of data (step 722). The serving paging cell in the same way sent on the DL-SDCH channel. Information The checklist can indicate where and / or how the paging message is sent on the DL-SDCH. The UE may send channel quality information on the CQICH and / or acknowledgment on the ACKCH for the page message (step 724). The serving cell may perform one or more retransmissions for the paging message, if necessary, on the DL-SDCH until the paging message has been correctly decoded by the UE (step 726).

[0053] The structure shown in Fig. 7 has various desirable properties. First, paging is supported using the shared control channel and data channel, similar to the structure shown in Fig. 6. Second, only a small amount of information (e.g., only paging indicator) is sent from all cells in the paging area of ​​the device. sent can handle UE device. This can significantly reduce the amount of PHY physical resources used for paging. Third, the paging message can be sent efficiently using features that are available for normal data transmission, for example HARQ and link adaptation. This can further reduce the amount of PHY physical resources used to send the paging message. In particular, the paging message may be sent using the MCS scheme and / or transmission power level, which may be selected based on UE user conditions, and from one cell that

53 / 59P29579EN00 two transport procedures and UE user device channel instead of the worst case channel conditions for all UEs.

[0054] Figures 6 and 7 show specific paging structures that use the physical channels described above. Paging indicators and paging messages may also be sent by other means and / or using other transport and physical channels. For example, in Fig. 6, the first paging message transmission may be performed on a DL-SDCH concurrently with a paging indicator on an SDCCH channel. Then, if needed, a greater number of retransmissions can be made

In another example, in Fig. 7, pointers may be sent on a single indicator paging channel or paging paging from all cells in the paging area, and paging messages may be sent on a shared data channel from a single cell. Other designs and paging procedures may also be implemented.

[0055] UEs may be mapped to paging occasions in various ways. In one design, UE user devices are mapped to specific paging occasions, for example based on mixing UE user device identifiers. Different UEs may be mapped in a pseudo-random manner to different time periods in the transmission time course. Each UE may wake up before its paging occasions and monitor paging indicators. One or more SDCCHs can be used to send paging indicators. If multiple SDCCHs are available, then UEs may be mapped to different SDCCHs, e.g. based on their UEs IDs. In this case, a paging opportunity for

The UE may correspond to a specific SDCCH in a specific time period. In general, UEs may be mixed to different SDCCHs at a time and / or to different PHY physical resources at the same time. The purpose of mixing is to obtain UEs with the same part of the least significant bits (LSB) of the UEs IDs of the UEs to be mixed into different SDCCH channels, so that the paging indicator at a given time can be targeted for a single UE or a small UE number of EU user devices.

[0056] UE identification information may be sent with a paging indicator to identify a referenced UE. In one design, UE user device identification information includes a complete UE user device ID, e.g., a complete RNTI identifier. This design allows each UE to determine, clearly that a paging indicator is sent to that UE. This design can be used for the paging procedures shown in Figures 6 and 7.

[0057] In another design, UE user identification information includes a partial UE device identifier, e.g., a predetermined number of LSB bits UE UE identifier, e.g. RNTI identifier. Generally, any portion of the UE's user ID and any number of bits may be used for the partial identifier

UE user device ID random than most bits

LSBs may be more significant (MSB) can be used for the partial UE device ID. The number of bits to be used can be a fixed or configurable value and may depend on the number

53 / 59P29579EN00 bits available on the SDCCH for UE identification information. This design reduces the number of bits to be sent for UE identification information. UEs may be mapped to paging occasions such that no two UEs with the same partial UE ID are not mapped to the same paging occasion. In this case, all UE user devices that are mapped to each paging occasion may be uniquely identified based on their partial UE device IDs. This mapping ensures that the partial UE user ID sent during the paging occasion can uniquely identify the referenced UE. Mapping UEs' devices to paging occasions can be done in various ways. For example, the hash function may map UEs for paging occasions based on their UEs IDs, but avoids mapping two UEs with the same partial UE identifier for the same paging occasion. This design can also be used for the paging procedures shown in Figures 6 and 7.

[0058] Sending UE identification information together with paging indicators may have some advantages. For example, UEs may quickly determine if paging messages are being sent to them based on UE user identification information or not, and may enter sleep mode without having to decode the data channel for the page messages. For the construction shown in fig. 7, only UE devices just recalled (instead of all UEs) would match on the channel

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RACH. This reduces the amount of signaling needed for paging.

reverse link [0059] Paging indicators can be sent in various ways. In one design, the paging indicator is explicitly sent via the designated field.

For example, a bit can be allocated to any paging occasion can be set to either one '1 to indicate that a paging indicator is being sent or to zero (' 0 ') to indicate that no paging indicator is being sent. Each UE may determine if a paging indicator has been sent by checking that bit. In another design, the paging indicator is explicitly sent by a specific index or value for the designated field.

For example, the control information for each transmission on the DL-SDCH may include a field that carries the type of data sent in the transmission. A specific index can be assigned to paging, and a field can be set to that index whenever a page message is sent. In yet another design, the paging indicator is sent implicitly. Such implicit paging indicator signaling can be obtained in various ways.

[0060] Fig. 8 is a structure 800 for implicitly sending a paging indicator. In this design, the cyclic redundancy check (CRC) generator 810 receives control information for the DL-SDCH and generates a CRC value. Masking unit 812 masks (e.g., encrypts) the CRC value using the paging ID and provides the masked CRC value. Paging ID used for paging and UE devices.

is a specific sequence known to cells and control as well

Information masked CRC value is sent on the SDCCH channel. Indicator

The paging is implicitly sent via the masked CRC value.

[0061] Fig. 9 is a structure 900 for reproducing an implicit paging indicator. Control information and the masked CRC value are received from the SDCCH. The CRC 910 generator generates the CRC value based on the received control information and provides the generated CRC value. The unmasking unit 912 unmasks (e.g. decrypts) the masked CRC value with the same paging ID used by the cell and provides the received CRC value. Comparison unit 914 compares the generated CRC value with the received CRC value and, if there is a match, indicates that a paging indicator has been sent.

[0062] In Fig. 6, implicit paging indicator may be sent by masking control information or CRC value sent on the SDCCH for paging message sent on the DL-SDCH. Each UE may unmask control information or a CRC value to determine if a paging indicator has been sent. Other information may also be masked. In any case, no additional PHY physical resources are used to send the implicit paging indicator.

[0063] Fig. 10 is a construction of a process 1000 performed by a cell to recall a UE.

The cell sends a paging indicator to the UE (e.g. on a shared control channel) (block 1012). The cell may send UE identification information along with the paging indicator. The UE information about the UE may identify the UE as the intended recipient of the paging indicator and may include all or part of the UE's identifier that

53 / 59P29579EN00 uniquely identifies the UE. The cell performs monitoring (e.g., a random access channel) for confirmation for a paging indicator from the UE (block 1014). The cell may determine that it is a cell designated to operate the UEs based on receipt of the acknowledgment. [0064] The cell sends a paging message to the UE (e.g. on a shared data channel) if confirmation from the UE is received for the paging indicator (block 1016). The cell may send uplink resource assignment to the UE, which may use uplink resources to send feedback for the transmission of the forward paging message. The cell may receive channel quality information from the UE and may use this information to send paging messages using link adaptation and / or HARQ. The cell may select a modulation and coding scheme and / or a transmission power level based on the received channel quality information. The cell may send a paging message according to the selected modulation and coding scheme and / or the selected transmission power level to the UE. The cell may perform the paging message transmission to the UE and may perform the paging message retransmission if no acknowledgment for the paging message is received. A paging indicator may be sent from multiple cells to a UE, and a paging message may be sent from a single cell to the UE.

[0065] Fig. 11 is a device 1100 for paging a UE. The device 1100 includes means for sending a paging indicator to a UE (module 1112), means for monitoring confirmation for a paging indicator from

A UE (module 1114) as well as means for sending a paging message to a UE if an acknowledgment for a paging indicator is received from the UE (module 1116). Modules 1112 to 1116 may contain processors, electronic devices, hardware devices, electronic components, logic circuits, memories and the like, or any combination thereof.

[0066] Fig. 12 is a construction of a process 1200 performed by a UE in order to receive a paging. The UE may receive a paging indicator for the UE, e.g. via a shared control channel (block 1212). The UE may receive the UE identification information (e.g., full or partial UE identifier of the UE) with the paging indicator and may determine that the paging indicator is intended for the UE user based on the UE identification information. The UE sends the acknowledgment for the paging indicator, e.g., via a random access channel (block 1214). Then, the UE will receive a page message for the UE, e.g. via a shared data channel (block 1216). The UE may send channel quality information and may process the paging message according to a modulation and coding scheme selected based on the channel quality information. The UE may also receive the transmission and possibly one or more retransmissions for the page message.

[0067] Fig. 13 shows a device 1300 designed to receive paging. The device 1300 includes means for receiving a paging indicator for the device

UE (module 1312), means for sending acknowledgment for a paging indicator (module 1314), and means for receiving a paging message intended for a UE (module 1316). Modules 1312 to 1316 may contain processors, electronic devices, hardware devices, electronic components, logic circuits, memories and others, or any combination thereof.

[0068] Fig. 14 is a construction of a process 1400 performed by a cell to recall a UE. The cell sends a paging indicator on a shared control channel to the UE (block 1412). The cell sends a paging message on a shared data channel to the UE (block 1414). The cell may send UE user identification information with the paging indicator to identify the UE as the intended recipient of the paging indicator. The shared control channel may carry control information for the shared data channel. The shared data channel may carry data for different UEs and / or different types of data. The paging indicator and the paging message may be sent from multiple cells to the UE, e.g. as shown in Fig. 6. Alternatively, the paging indicator may be sent from multiple cells to the UE and the paging message may be sent from a single cell to a UE, as shown in Fig. 7, for example.

[0069] Fig. 15 shows a device 1500 for paging a UE. The apparatus 1500 includes means for sending a paging indicator on a shared control channel to a UE (module 1512) and means for sending a paging message on a shared data channel to a UE (module 1514). Modules 1512 and 1514 may contain processors,

Electronic devices, hardware devices, electronic components, logic circuits, memories and others or any combination thereof.

[0070] Fig. 16 shows the structure of a process 1600 performed by a cell and / or a system controller for paging. Each UE is associated with (1) the UE ID of the UE that uniquely identifies this UE and with (2) the UE UE partial ID that is derived from the UE UE ID. UE user device IDs may be MAC IDs or other IDs specific to UE user devices. UEs are mapped to paging occasions based on their IDs so that UEs with the same partial identifier are mapped to different paging occasions (block

1612)

A paging indicator and a partial UE user ID for a receiving UE are sent on paging occasions for a receiving UE (block 1614). The UE partial device ID for the receiving UE may be determined based on a predetermined number of LSB bits UE user ID for the receiving UE.

[0071] Fig. 17 shows a paging device 1700. The 1700 device includes means for mapping UE user devices for paging occasions based on their UE user device IDs

UE with the same so that the partial for different occasions includes means to and device users ID UE ID are paging (module 1712), sending indicator mapped as well as paging

The UE identifier of the UE for the receiving UE in the paging occasion of the receiving UE (module 1714). Modules

1712 and 1714 may contain processors, electronic devices, hardware devices, electronic components, logic circuits, memories and others, or any combination thereof.

[0072] Fig. 18 is a processor design 1800 for sending an implicit paging indicator. The cell masks information using the paging ID to obtain masked information (block 1812). The cell then sends masked information to transfer information and to covertly transfer the paging indicator (block 1814). The information to be masked can be control information sent on a shared data channel or other type of information. The cell can mask and send this information by generating a CRC value that is used as masking information, masking the CRC value using the paging ID to generate the masked CRC value, and sending the masked CRC value.

[0073] Fig. 19 shows an apparatus 1900 for sending an implicit paging indicator. The 1900 device includes means for masking information using a paging ID to obtain masked information (module 1912), and means for sending masked information to transfer information and implicitly moving a paging indicator (module 1914). Modules 1912 and 1914 may contain processors, electronic devices, hardware devices, electronic components, logic circuits, memories etc. or any combination thereof.

[0074] Fig. 20 is a block diagram of the structure of one UE 120, one Node B 110, and the system controller 130 of Fig. 1. Towards

Transmission, data and signaling to be sent by UE 120 are processed (e.g., formatted, encoded and interleaved) by the 2012 encoder and further processed (e.g., modulated, channeled and encrypted) by the modulator (Mod) 2014 to generate output chips. The transmitter (TMTR) 2022 conditions (for example, converts to analogue, filters, amplifies and increases the frequency) output chips and generates a reverse link signal that is transmitted via antenna 2024. In the direction of reception, the forward link signals transmitted by the Node B 110 and other Nodes B, are received by the antenna conditions (for example

2024. The receiver (RCVR) 2026 filters, amplifies, reduces the frequency and converts to digital) the signal received from the antenna 2024 and provides samples. Demodulator (Demod) 2016 processes (for example, decrypts, splits and demodulates) these samples and provides symbol estimates. The decoder 2018 also processes (e.g. deinterlaces and decodes) symbol estimates and provides decoded data. Encoder 2012, modulator 2014, demodulator 2016, as well as decoder 2018 can be implemented by a modem processor 2010. These units perform processing in accordance with the radio technology used by the wireless communication system.

[0075] The controller / processor 2030 directs the operation of various entities on the UE 120. The controller / processor 2030 can perform the process 1200 of Fig. 12 and / or other processes to receive calls. Memory 2032 stores program codes and data for UE 120.

110 includes transceiver 2038, memory (Mem) 2042, and unit. The transceiver 2038 implements UE 120 and [0076] Node B processor / controller 2040, communication 2044 (Comm), radio communication with other UEs. The 2040 processor / controller performs various functions for communication and paging

UE devices and may implement process 1000 of Fig.

10, process 1400 of Fig. 14, process 1600 of Fig. 16, process 1800 of Fig. 18 and / or other processes. Memory 2042 stores program codes and data for the Node B 110. Communication unit 2044 facilitates communication with the system controller 130.

[0077] System controller 130 includes a processor / controller 2050, memory 2052, as well as a communication unit 2054. The processor / controller 2050 performs various functions to support communication and paging for UEs, e.g., which cells are in the paging area UE 120 and sends paging indicators and paging messages to these cells. The processor / controller 2050 may implement the process 1600 of Fig. 16 and / or other processes. Memory 2052 stores program codes and data for the system controller 130. Communication unit 2054 facilitates communication with the Node B 110.

[0078] The paging techniques described herein may be implemented using a variety of means. For example, these techniques can be implemented on a hardware platform, using firmware, software or a combination thereof. For hardware implementation, processing units used to support paging in a UE, Node B or system controller may be implemented in one or more specialized integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD) ), programmable logic devices (PLD), programmable logic gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, electronic devices, other electronic units designed to perform the functions described herein or combinations thereof.

[0079] For implementation on the firmware and / or software platform, paging techniques may be

53 / 59P29579EN00 implemented using modules (e.g., procedures, functions, etc.) that perform the functions described herein. Firmware and / or software codes may be stored in memory (e.g., memories 2032, 2042 or 2052 of Figure 20) and executed by a processor (e.g., processor 2030, 2040 or 2050). The memory can be implemented in or outside the processor.

[0080] The previous description of the invention has been presented to enable any person skilled in the art to make or use the present invention. Various modifications of the invention will be readily apparent to those skilled in the art, and the general principles set out herein may be applied to other variations without departing from the scope of the invention. The invention is therefore not intended to be limited to the examples described herein, but is to be understood to the fullest extent possible in accordance with the principles and new features disclosed herein.