Method and apparatus for enhanced paging

IS 2 379 149 T3

DESCRIPTION

Method and apparatus for improved paging.

BACKGROUND

I. Field

The present disclosure relates generally to communication and, more specifically, to techniques for paging user equipment (UE) in a wireless communication system.

II. Background

A UE in a wireless communication system (eg, a cell phone in a cellular system) can operate in one of several states, such as active and sleeping states, at any given time. In the active state, the UE can actively exchange data with one or more Node Bs (or base stations), for example, for a voice or data call. In the sleeping state, the UE can be turned off for much of the time, to conserve battery power, and it can wake up periodically to monitor paging messages sent to the UE. These paging messages can alert the UE to the presence of an incoming call, or they can provide other information.

A wireless communication system consumes radio resources to support paging. For example, the system may send paging indicators on a paging indicator channel (PICH), to indicate whether or not paging messages are sent for UEs. The systems can send paging messages over a paging channel (PCH) to UEs. A UE can quickly receive the paging indicators, determine if a paging message is sent to the UE, and either process the TCP if a paging message is sent, or go back to sleep immediately if no paging message is sent to the UE. . The PICH and PCH are crimp channels that are used for all UEs. For this reason, these crimp channels are usually sent at a sufficiently low rate and with sufficient transmit power, such that even the most disadvantaged UE, with the worst channel conditions, can reliably receive paging indicators and paging messages. paging. Furthermore, since the location of the UEs being paged may not be known, the system usually sends paging indicators and paging messages from all cells in a wide area. Sending paging indicators and paging messages over a bezel channel, over a wide area at low speed and / or high transmission power, can consume a lot of radio resources. Publication US-A2004 / 091 022 refers to a CDMA system that uses a mapping function to transmit paging indicator bits based on the IMSI_S of the remote unit, prone to collisions.

There is, therefore, a need in technology for techniques to effectively search for UEs.

ABSTRACT

Techniques for paging UEs in a wireless communication system are described herein.

According to the invention a cell sends a paging indicator on a shared control channel to a UE and sends a paging message on a shared data channel to the UB. The paging indicator and the paging message can be sent from multiple cells to the UE, and the paging message can be sent from a single cell to the UE. The cell can send the paging indicator and possibly identification information from the UE to the UE. The UE identification information identifies the UE as the intended recipient of the paging indicator and may comprise all or part of a UE identifier that uniquely identifies the UE.

The cell sends a paging message to the UE if an acknowledgment for the paging indicator is received from the UE. The cell can receive channel quality information from the UE and can send the paging message with link adaptation and / or automatic hybrid retransmission (HARQ) to improve performance.

Various aspects and features of the disclosure are described in more detail below. The invention is defined as in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a wireless communication system.

FIG. 2 shows a layout of a frame format.

FIG. 3 shows a timeline for a UE in a DRX mode of operation.

IS 2 379 149 T3

FIG. 4 shows a downlink physical, transport and logical channel layout.

FIG. 5 shows an uplink physical, transport and logical channel layout.

FIG. 6 shows a paging procedure that uses shared channels for paging.

FIG. 7 shows a paging procedure that sends a paging message from a single cell.

FIG. 8 shows a design for implicitly sending a paging indicator.

FIG. 9 shows a design for retrieving an implicit paging indicator.

FIG. 10 shows a process performed by a cell to search for a UE.

FIG. 11 shows an apparatus for radio paging a UE.

FIG. 12 shows a process performed by a UE to receive a page.

FIG. 13 shows an apparatus for receiving a paging.

FIG. 14 shows another process performed by a cell to search for a UE.

FIG. 15 shows another apparatus for radio paging a UE.

FIG. 16 shows a process performed by a network entity for paging.

FIG. 17 shows an apparatus for paging.

FIG. 18 shows a process for sending an implicit paging indicator.

FIG. 19 shows an apparatus for sending an implicit paging indicator.

FIG. 20 shows a block diagram of a UE, a Node B, and a system controller.

DETAILED DESCRIPTION

The paging techniques described herein can be used for various communication systems, such as Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Multiple Access Systems Time Division (TDMA), Orthogonal FDMA (OFDMA) systems, Single Carrier FDMA (SC-FDMA) systems, etc. The terms "systems" and "networks" are often used interchangeably. A CDMA system can use radio technology such as Broadband CDMA (W-CDMA), cdma2000, etc. The cdma2000 covers the IS-95, IS2000 and IS-856 standards. A TDMA system can use radio technology such as Global System for Mobile Communications (GSM). These various technologies, standards, and radio systems are known in the art. An OFDMA system uses Orthogonal Frequency Division Multiplexing (OFDM) and sends frequency domain modulation symbols on orthogonal subcarriers. An SC-FDMA system uses Single Carrier Frequency Division Multiplexing (SC-FDM) and sends modulation symbols in the time domain on orthogonal subcarriers. For clarity, paging techniques are described below for a wireless communication system using Long Term Evolution (LTE), which is a radio technology in development. However, paging techniques can also be used for various other wireless communication systems.

FIG. 1 shows a wireless communication system 100 with multiple Nodes Bs 110. A Node B is, in general, a fixed station that communicates with UEs and which can also be called a base station, an evolved Node B (eNode B), a access point, etc. Each Node B 110 provides communication coverage for a specific geographic area. The term "cell" may refer to a Node B and / or its coverage area, depending on the context in which the term is used. To improve system capacity, a Node B coverage area can be divided into multiple smaller areas, for example three smaller areas. Each smaller area can be served by a respective base transceiver subsystem (BTS). The term "sector" may refer to a BTS and / or its coverage area, depending on the context in which the term is used. For a sectorized cell, the BTSs for all sectors of that cell are typically placed within the Node B for the cell.

UE 120s can be dispersed throughout the system. A UE can be static or mobile, and can also be called a mobile station, mobile equipment, terminal, access terminal, station, and so on. A UE can be a cell phone, a PDA, a wireless modem, a wireless communication device, a handheld device, a subscriber unit, and so on. A UE can communicate with one or more Node Bs by downlink and uplink transmissions. The downlink (or direct link) refers to the link of

ES 2 379 149 T3 communication from Node Bs to UEs, and the uplink (or reverse link) refers to the communication link from UEs to Node Bs. In FIG. 1, a solid line with double arrows indicates data exchanges between a Node B and a UE in the active state. A broken line with a single arrow indicates a UE in the dormant state, and receiving paging messages and / or other information. A UE can be served by a specific Node B, which is called a serving cell for the UE.

A system controller 130 may couple to Node Bs 110 and provide coordination and control for these Node Bs. 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), a Mobile Switching Center (MSC), etc.

FIG. 2 shows a design of a frame format 200 for system 100. The transmission timeline 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 can be divided into multiple (N) subframes, eg, N = 20 or some other value. In general, radio frames and subframes can have any lengths, and can also be referred to with some other terminology, eg, frames, slots, etc.

FIG. 3 shows a timeline 300 for a UE in a discontinuous receive (DRX) mode of operation. DRX mode can also be called slotted mode paging. In DRX mode, the UE is assigned paging occasions, which are time periods in which the UE can receive paging. Each paging occasion may correspond to a specific radio frame, a specific subframe of a specific radio frame, and so on. Paging occasions can also be called paging periods, paging frames, paging sub-frames, and so on. The paging occasions for the UE may be separated by a time interval called a DRX cycle. The DRX cycle can be configurable for the UE. The paging occasions for the UE can be determined based on parameters such as, for example, a specific identifier for the UE (UE Identifier).

The UE may periodically wake up prior to its paging occasions, to receive any paging messages sent to the UE. Paging messages are also called paging messages, paging messages, and so on. Paging messages are not sent to the UE outside of its paging occasions. The UE can therefore go to sleep during the time between its paging occasions, if there is no other task to perform. The UE can turn off as many circuits as possible while asleep, in order to conserve battery power.

System 100 may use logical channels, transport channels, and physical channels to support various services. A Medium Access Control (MAC) layer can provide data transfer services over logical channels. Different types of logical channel can be defined for different classes of data transfer services, and each type of logical channel can carry a different type of information. The MAC layer can associate logical channels with transport channels and can process (eg, encode and modulate) logical channel data to generate MAC protocol data units (PDUs). A physical layer (PHY) can associate the transport channels with physical channels, and can process (eg, pipe and encrypt) the MAC PDUs to generate output data for the physical channels.

FIG. 4 shows a logical, transport, and physical channel layout for the downlink (DL). In this design, the downlink logical channels include:

• The broadcast control channel (BCCH) - carries system control information, • The dedicated traffic channel (DTCH) - carries user information for a specific UE, • The dedicated control channel (DCCH) - carries information on control for a specific UE, • The MBMS traffic channel (MTCH) - carries traffic data for multiple UEs, and • The MBMS control channel (MCCH) - carries scheduling and control information for one or more MTCHs, where MBMS stands for Mobile Multimedia and Broadcast Services.

Downlink transport channels include:

• Broadcast Channel (BCH) - carries part of the BCCH, and • DL Shared Data Channel (DL-SDCH) - carries the DCCH, DTCH, MCCH, MTCH and part of BCCH.

A separate transport channel may exist for MBMS traffic and control on an MBMS channel (MCH).

IS 2 379 149 T3

Downlink physical channels include:

• Common Control Channel (CCCH) - carries system and cell parameters to demodulate other physical channels and carries the BCH, • Acknowledgment Channel (ACKCH) - carries Acknowledgment (ACK) / Negative Acknowledgment (NAK ) for the ULSDCH, • DL shared data physical channel (DL-PSDCH) - carries the DL-SDCH, • DL shared control channel (SDCCH) - carries control information for the DL-PSDCH, and • UL Shared Assignment Channel (SUACH) - carries Uplink physical resource assignments.

Physical resources refer to resources used for physical channels. Physical resources can be quantized by frequency (eg, subcarriers), time (eg, time slots), code (eg, channelization codes), space (eg, transmitting antennas), transmitting power, etc.

FIG. 4 also shows an association of logical channels with transport channels, and an association of transport channels with physical channels. Some of the downlink transport and physical channels are described in more detail later.

FIG. 5 shows a logical, transport and physical channel layout for the uplink (UL). In this design, the uplink logical channels include the DCCH and DTCH. Uplink transport channels include:

• Random Access Channel (RACH) - carries access requests and possibly other information; and • UL Shared Data Channel (UL-SDCH) - carries DCCH and DTCH.

Based on the information carried by the RACH, the RACH can be considered only as a physical channel.

The uplink physical channels include:

• Random Physical Access Channel (PRACH) - carries RACH, • UL Shared Data Physical Channel (UL-PSDCH) - carries UL-SDCH, • Acknowledgment Channel (ACKCH) - carries ACK / NAK for the DL-SDCH, and • Channel Quality Indicator Channel (CQICH) - carries CQI for DL ​​signal quality.

FIG. 5 also shows an association of logical channels with transport channels and an association of transport channels with physical channels. Some of the uplink transport and physical channels are described in more detail later.

FIGS. 4 and 5 show specific downlink and uplink channel layouts, referred to in the description below. In general, a system can support any number and any type of logical, transport and physical channels for each link, for example, more, less and / or different channels than those presented above. Logical, transport and physical channels can also be associated in other ways.

A UE can register with the system and can "camp" in a serving cell when it is not in active communication. At the time of registration, the UE is located within the coverage of the serving cell and is also within a paging area that covers the serving cell and neighboring cells. With reference to FIG. 1, the serving cell for the UE 120x may be Node B 110x, and the paging area of ​​the UE 120x may include the seven cells bounded by the heavy dashed line. Depending on its configuration, the UE can perform the cellular update every time the UE advances to a new cell, or a paging area update every time the UE advances to a new paging area.

FIG. 6 shows a design of a paging procedure 600 that uses shared channels for paging. A UE may be camping in a serving cell and may periodically wake up to monitor paging, for example, as shown in FIG. 3. At any given time, the exact location of the UE may not be known. For example, the UE may have advanced to a new cell, while sleeping between its 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 can send a paging indicator (Paging Ind) and,

ES 2 379 149 T3 possibly identification information from the UE (UE Identifier Information) to the UE (step 612). The UE identification information identifies the paged UE, and may comprise a full or partial UE Identifier, and / or other information. The UE Identifier can be a Radio Network Temporary Identifier (RNTI), an International Mobile Subscriber Identifier (IMSI), a MAC Identifier, etc. An RNTI is a Unique UE Identifier for a UE in the system. The paging indicator and UE identification information can be sent over the SDCCH, as described below. The serving cell and other cells in the paging area can also send a paging message on the DL-SDCH to the UE (step 614). Sending the paging indicator and paging message from all cells in the paging area of ​​the UE increases the probability that the UE can receive the paging message when the location of the UE is not known with certainty.

The cells can send the paging indicator and a paging message, in a way that is known a priori, whereby, upon receiving the paging indicator, the UE knows where the paging message is sent on the DL-SDCH, and how to decode the paging message. For example, each paging indicator sent on the SDCCH can be associated with a paging message sent on the DL-SDCH using a predetermined modulation and coding scheme (MCS) and predetermined physical resources. In this case, no control information can be sent on the SDCCH for the paging message sent on the DLSDCH. Alternatively, control information may be sent on the SDCCH to indicate where and / or how to retrieve the paging message on the DL-SDCH.

The UE receives the paging message from the DL-SDCH and can respond to the paging message by performing a random access and sending a transmission on the RACH (step 616). The RACH transmission may include an acknowledgment for the paging message, channel quality information indicating the quality of the downlink channel, a request for uplink physical resources, and so on. In general, any cell in the paging area of ​​the UE can receive the RACH transmission, depending on the current location of the UE. In one design, the cell that receives the RACH transmission can respond to the UE and perform the processing described below. In another design, the UE may direct the transmission of the RACH to a specific cell, for example, using a "signature" or a basic sequence corresponding to the selected cell. The selected cell would then perform the processing described below, if it can successfully receive the RACH transmission. The following description assumes that the serving cell receives the RACH transmission.

The serving cell receives the transmission from the RACH and may respond by sending an assignment on the SUACH (step 618). The transmission of the SUACH may include the MAC Identifier of the UE, the timing adjustment to adjust the transmit timing of the UE, the allocation of physical resources for the ACKCH, CQICH and / or UL-SDCH channels, etc. The MAC Identifier can be assigned to the UE during the exchange after the initial paging, and can be used to identify the transmission on the DL-SDCH. The assignment of the ACKCH and / or the CQICH can also be implicit, and not sent by the SUACH. For example, the physical resources for the ACKCH may be implicit from transmission on the DL-SDCH. The UE can then send channel quality information on the CQICH, and / or acknowledgments on the ACKCH (step 620).

For downlink data transmission, the serving cell can send control information on the SDCCH (step 622) and can send data on the DL-SDCH (step 624) in the normal / usual way. The control information sent by the SDCCH may comprise various types of information, such as, for example, the MAC Identifier of the destination UE for data transmission on the DL-SDCH, the MCS, the allocation of resources and the interval. Transmission Time (TTI) for data transmission, etc. Data transmission can be sent with Hybrid Automatic Relay (HARQ), Link Adaptation, etc. With HARQ, a transmitter sends a transmission for a packet and can send one or more retransmissions, if necessary, until the packet is correctly decoded by a receiver, or the maximum number of retransmissions has been sent, or encountered some other termination condition. HARQ can improve the reliability of data transmission. Link adaptation can include speed control, power control, etc. Rate control refers to the selection of a modulation and coding scheme such that a packet can achieve a desired performance metric. The metric can be quantized, for example, by a desired probability of a successful decoding after a desired number of retransmissions with HARQ. Power control refers to adjusting the transmit power to achieve a desired quality of received signal, while reducing transmit power and interference. The serving cell may use the received channel quality information in step 620 for link adaptation, and may select an MCS and / or a transmit power level based on the received information.

In the design shown in FIG. 6, paging is supported using a shared control channel and a shared data channel, which are shared by UEs and are also used for different types of data. For example, the DL-SDCH can carry user traffic data (DTCH) and user control information (DCCH) for specific UEs, broadcast data (MTCH) and broadcast control information (MCCH) for multiple UEs, etc. . This design avoids the use of a separate paging indicator channel (PICH) and a separate paging channel (PCH) to support paging. The use of shared control and data channels for paging can provide certain advantages, such as, for example, a simpler implementation in the UE and / or in the

ES 2 379 149 T3 cells, improved utilization of physical resources through multiplexing, no fixed setting (eg for the paging indicator channel, which is used in W-CDMA and cdma2000), etc.

FIG. 7 shows a design of a paging procedure 700 that sends a paging message from a specific cell. A UE may be camping in a serving cell and may periodically wake up to monitor paging. When the system has a paging for the UE, the serving cell and other cells in the UE paging area send a paging indicator and possibly UE identification information on the SDCCH to the UE (step 712). The UE receives the paging indicator and may respond to the paging indicator by performing a random access and sending a transmission on the RACH (step 714). The RACH transmission may include an acknowledgment for the paging indicator, channel quality information, and / or other information. The RACH transmission may or may not include a request for uplink physical resources on the UL-SDCH. The RACH transmission serves to acknowledge the paging indicator and to provide the current location of the UE. In particular, the current location of the UE can be determined based on the cell (s) receiving the RACH transmission. In general, any cell in the paging area can receive the RACH transmission, and the cell that receives the RACH transmission, or the cell selected by the UE, can respond to the UE. The following description assumes that the serving cell receives the RACH transmission.

The serving cell responds to the RACH transmission by sending an assignment on the SUACH (step 716). The transmission of the SUACH may include the MAC Identifier of the UE, the timing adjustment for the UE, the allocation of physical resources for the ACKCH and / or the CQICH, etc. The MAC Identifier sent in step 716 can be used as the UE Identifier during an active state. The UE Identifier in step 712 can be inferred from the RNTI or IMSI, and can be used as the UE Identifier in a non-active state. The ACK and / or CQI assignment can also be implicit, and not sent by the SUACH. The UE can then send channel quality information on the CQICH (step 718). Step 718 can be skipped, for example, if the channel quality information is sent over the RACH in step 714. The serving cell can use the channel quality information for link adaptation, and can select an MCS and / or a transmit power level for transmission to the UE, based on the information received. The serving cell sends control information on the SDCCH (step 720) and sends a paging message on the DLSDCH to the UE (step 722). The serving cell can send the paging message in the same way as other types of data sent on the DL-SDCH. The control information may 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 an acknowledgment on the ACKCH for the paging message (step 724). The serving cell may send one or more retransmissions for the paging message, if necessary, on the DL-SDCH, until the paging message is correctly decoded by the UE (step 726).

The design shown in FIG. 7 has several desirable traits. First, paging is supported using shared control and data channels, similar to the design shown in FIG. 6. Second, only a small amount of information (for example, only the paging indicator) is sent from all cells in the UE's paging area, and the paging message is sent from a single cell that can serve to the EU. This can greatly reduce the amount of physical resources used for paging. Third, the paging message can be sent efficiently using features that are available for normal data transmission, eg HARQ and link adaptation. This can further reduce the amount of physical resources used to send the paging message. In particular, the paging message can be sent with an MCS and / or with a transmit power level that can be selected based on the channel conditions of the UE, rather than the worst-case channel conditions, for all UEs. .

FIGS. 6 and 7 show specific designs of two paging procedures using the transport and physical channels described above. The paging indicators and paging messages can also be sent in other ways and / or using other transport and physical channels. For example, in FIG. 6, the first transmission of a paging message may be sent on the DL-SDCH in concurrence with a paging indicator on the SDCCH. One or more retransmissions of the paging message can then be sent, if necessary. As another example, in FIG. 7, the paging indicators can be sent on a paging indicator channel from all cells in a paging area, and the paging messages can be sent on a shared data channel from an individual cell. Other paging designs and paging procedures may also be implemented.

UEs can be associated with search occasions in a number of ways. In one design, UEs are associated with specific paging occasions, for example, based on a mapping of their UE Identifiers. Different UEs can be pseudo-randomly associated with different time slots in the transmission timeline. Each UE can wake up before its assigned paging occasions, and monitor the paging indicators. One or multiple SDDCHs can be used to send paging indicators. If multiple SDDCHs are available, then UEs can associate to different SDCCHs, for example based on their UE Identifiers. In this case, a paging occasion for a UE may correspond to a specific SDCCH in a specific time slot. In general, UEs can be mapped with different SDCCHs in time, and / or with different resources

ES 2 379 149 T3 physical within the same time. One objective of the mapping is that UEs with the same least significant bit (LSB) portion of the UE Identifiers are mapped to different SDCCHs, such that a paging indicator at any given time can point to a single UE or a small number of EU.

The UE identification information can be sent with a paging indicator to identify the UE being paged. In one design, the UE identification information comprises a complete UE Identifier, a complete RNTI, and so on. This design allows each UE to unambiguously determine whether or not a paging indicator is sent for that UE. This design can be used for the paging procedures shown in FIGS. 6 and 7.

In another design, the UE identification information comprises a partial UE Identifier, eg, a predetermined number of LSBs in a UE Identifier, e.g. eg, an RNTI. In general, any portion of the UE Identifier and any number of bits can be used for the Partial UE Identifier. LSBs can be more random than Most Significant Bits (MSBs) and can be used for the Partial UE Identifier. The number of bits to be used can be a fixed or configurable value, and can depend on the number of bits available by the SDCCH for the UE identification information. This design reduces the number of bits to send for UE identification information. UEs can be associated with paging occasions such that no two UEs with the same Partial UE Identifier are associated with the same paging occasion. In this case, all UEs that are associated with each paging occasion can be uniquely identified based on their Partial UE Identifiers. This association ensures that a Partial UE Identifier sent on a paging occasion can unambiguously identify the UE being paged. The association of UEs with paging occasions can be accomplished in a number of ways. For example, a mapping function may associate UEs with paging occasions based on their UE Identifiers, but avoid associating two UEs with the same partial UE Identifier to the same paging occasion. This design can also be used for the paging procedures shown in FIGS. 6 and 7.

Sending UE identification information in conjunction with paging indicators can provide certain advantages. For example, UEs can quickly determine whether or not paging messages are being sent to them based on UE identification information, and can just go to sleep without having to decode the data channel for paging messages. paging. For the design shown in FIG. 7, only UEs that are being paged (instead of all UEs) would answer for the RACH. This reduces the amount of uplink signaling for paging.

The paging indicators can be sent in various ways. In one design, a paging indicator is explicitly sent through a designated field. For example, a bit may be allocated on each paging occasion, and it may be set either to one ("1") to indicate a sent paging indicator, or to zero ("0") to indicate that no paging indicator has been sent. paging. Each UE can determine if a paging indicator has been sent by checking this bit. In another design, a paging indicator is explicitly sent by a specific index or value for a designated field. For example, the control information for each transmission on the DL-SDCH may include a field carrying the type of data sent in the transmission. A specific index can be assigned for paging, and the field can be set to this index every time a paging message is sent. In yet another design, a paging indicator is sent implicitly. This implicit paging indicator signaling can be accomplished in a number of ways.

FIG. 8 shows a layout 800 for implicitly sending a paging indicator. In this design, a cyclic redundancy control (CRC) generator 810 receives control information for the DL-SDCH and generates a CRC value. A masking unit 812 masks (eg, encrypts) the CRC value with a Paging Identifier and provides a masked CRC value. The Paging Identifier is a specific sequence used for paging, and is known to cells and UEs. The control information and the masked value of the CRC are sent over the SDCCH. The paging indicator is sent implicitly by the masked value of the CRC.

FIG. 9 shows a layout 900 for retrieving an implicit paging indicator. The control information and the masked value of the CRC are received from the SDCCH. A CRC generator 910 generates a CRC value based on the received control information, and provides a generated CRC value. An unmasking unit 912 unmasks (eg, decrypts) the masked CRC value with the same Paging Identifier used by the cell, and provides a received CRC value. A comparison unit 914 compares the generated value of CRC with the received value of CRC, and indicates that a paging indicator has been sent if there is a match.

An implicit paging indicator may be sent in FIG. 6, masking the control information or CRC value sent by the SDCCH for the paging message sent by the DL-SDCH. Each UE can unmask the control information or the CRC value to determine if a paging indicator has been sent. Other information can also be masked. In either case, no additional physical resources are used to send the implicit paging indicator.

IS 2 379 149 T3

FIG. 10 shows a design of a process 1000 performed by a cell to parse a UE.

The cell sends a paging indicator to the UE (eg, on a shared control channel) (block 1012). The cell can send UE identification information with the paging indicator. The UE identification information may identify the UE as the intended recipient of the paging indicator, and may comprise all or a portion of the UE identifier that uniquely identifies the UE. The cell monitors (eg, a random access channel) for an acknowledgment for the paging indicator from the UE (block 1014). The cell may determine that it is the designated cell to serve the UE based on receipt of the acknowledgment.

The cell sends a paging message to the UE (eg, over a shared data channel) if the acknowledgment for the paging indicator is received from the UE (block 1016). The cell can send an uplink resource allocation to the UE, which can use the uplink resources to send feedback information for the downlink transmission of the paging message. The cell can receive channel quality information from the UE and can use this information to send the paging message with link adaptation and / or HARQ. The cell may select a modulation and coding scheme and / or a transmit power level based on the received channel quality information. The cell can send the paging message according to the selected modulation and coding scheme and / or the selected transmit power level to the UE. The cell can send a transmission of the paging message to the UE and can send a retransmission of the paging message if an acknowledgment for the paging message is not received. The paging indicator can be sent from multiple cells to the UE, and the paging message can be sent from a single cell to the UE.

FIG. 11 shows an apparatus 1100 for radio paging a UE. Apparatus 1100 includes means for sending a paging indicator to the UE (module 1112), means for monitoring an acknowledgment for the paging indicator from the UE (module 1114), and means for sending a paging message to the UE if received. the acknowledgment for the paging indicator from the UE (modulo 1116). Modules 1112-1116 can comprise processors, electronic devices, hardware devices, electronic components, logic circuits, memories, etc., or any combination thereof.

FIG. 12 shows a design of a process 1200 performed by a UE to receive a page. The UE receives a paging indicator for the UE, for example, via a shared control channel (block 1212). The UE may receive identification information from the UE (eg, a full or partial UE Identifier) ​​with the paging indicator and may check that the paging indicator is for the UE based on the identification information of the UE. The UE sends an acknowledgment for the paging indicator, for example, via a random access channel (block 1214). The UE then receives a paging message for the UE, for example, via a shared data channel (block 1216). The UE can send channel quality information and can process the paging message according to a modulation and coding scheme selected based on the channel quality information. The UE may also receive a transmission and possibly one or more retransmissions for the paging message.

FIG. 13 shows an apparatus 1300 for receiving a page. Apparatus 1300 includes means for receiving a paging indicator for a UE (modulo 1312), means for sending an acknowledgment for the paging indicator (modulo 1314), and means for receiving a paging message for the UE (modulo 1316). . Modules 1312-1316 can comprise processors, electronic devices, hardware devices, electronic components, logic circuits, memories, etc., or any combination thereof.

FIG. 14 shows a design of a process 1400 performed by a cell to search for 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 identification information of the UE with the paging indicator to identify the UE as a desired recipient of the paging indicator. The shared control channel may carry control information for the shared data channel. The shared data channel can carry data for different UEs and / or different types of data. The paging indicator and paging message can be sent from multiple cells to the UE, for example, as shown in FIG. 6. Alternatively, the paging indicator can be sent from multiple cells to the UE, and the paging message can be sent from a single cell to the UE, for example, as shown in FIG. 7.

FIG. 15 shows an apparatus 1500 for radio paging a UE. Apparatus 1500 includes means for sending a paging indicator on a shared control channel to the UE (module 1512) and means for sending a paging message on a shared data channel to the UE (module 1514). Modules 1512 and 1514 can comprise processors, electronic devices, hardware devices, electronic components, logic circuits, memories, etc., or any combination thereof.

FIG. 16 shows a design of a 1600 process performed by a cell and / or a system controller for the

ES 2 379 149 T3 paging. Each UE is associated with (1) a UE Identifier that uniquely identifies that UE and (2) a Partial UE Identifier that is inferred based on the UE Identifier. The UE Identifiers may be MAC Identifiers or some other UE specific Identifiers. UEs are associated with paging occasions based on their UE Identifiers, such that UEs with the same Partial UE Identifier are associated with different paging occasions (block 1612). A paging indicator and a partial UE Identifier for a recipient UE are sent on a paging occasion for the recipient UE (block 1614). The Partial UE Identifier for the recipient UE may be determined based on a predetermined number of LSBs (least significant bits) of the UE Identifier for the recipient UE.

FIG. 17 shows an apparatus 1700 for paging. Apparatus 1700 includes means for associating UEs with paging occasions based on their UE Identifiers, such that UEs with the same partial UE Identifier are associated with different paging occasions (modulo 1712), and means for sending a paging indicator and a partial UE Identifier for a recipient UE on a paging occasion for the recipient UE (modulo 1714). Modules 1712 and 1714 can comprise processors, electronic devices, hardware devices, electronic components, logic circuits, memories, etc., or any combination thereof.

FIG. 18 shows a design of a process 1800 for sending an implicit paging indicator. A cell masks information with a Paging Identifier to obtain masked information (block 1812). The cell then sends the masked information to carry the information and to implicitly carry a paging indicator (block 1814). The information to be masked can be control information sent over a shared data channel or some other type of information. The cell can mask and send the information by generating a CRC value that is used as the information to be masked, masking the CRC value with the Paging Identifier in order to generate a masked CRC value, and sending the masked CRC value.

FIG. 19 shows an apparatus 1900 for sending an implicit paging indicator. Apparatus 1900 includes means for masking information with a Paging Identifier, in order to obtain masked information (modulo 1912), and means for sending the masked information in order to carry the information and to implicitly carry a paging indicator (modulo 1914) . Modules 1912 and 1914 can comprise processors, electronic devices, hardware devices, electronic components, logic circuits, memories, etc., or any combination thereof.

FIG. 20 shows a block diagram of a design of a UE 120, a Node B 110, and a system controller 130 in FIG. 1. In the transmission direction, the data and signaling to be sent by the UE 120 are processed (eg formatted, encoded and interleaved) by an encoder 2012 and further processed (eg modulated, channeled and encrypted ) by a modulator (Mod) 2014 to generate output chips. A transmitter (TRMR) 2022 conditions (for example, converts to analog, filters, amplifies and increases the frequency) the output chips and generates an uplink signal, which is transmitted by an antenna 2024. In the receive direction, the Downlink signals transmitted by Node B 110 and other Node Bs are received by antenna 2024. A receiver (RCTR) 2026 conditions (eg, filters, amplifies, down-frequency, and digitizes) the signal received from antenna 2024 and provides samples. A demodulator (Demod) 2016 processes (for example, decrypts, channels and demodulates) displays them and provides symbol estimates. A 2018 decoder further processes (eg, deinterleaves and decodes) the symbol estimates and provides decoded data. Encoder 2012, modulator 2014, demodulator 2016, and decoder 2018 can be implemented by a 2010 modem processor. These units perform processing according to the radio technology used by the wireless communication system.

A controller / processor 2030 directs the operation of various units in UE 120. Controller / processor 2030 may carry out process 1200 in FIG. 12 and / or other processes to receive radio searches. A memory 2032 stores program codes and data for the UE 120.

Node B 110 includes a transceiver 2038, a processor / controller 2040, a memory (Mem) 2042, and a communication unit 2044 (Com). Transceiver 2038 provides radio communication with UE 120 and other UEs. Processor / controller 2040 performs various functions for communicating with, and paging for, UEs and may implement process 1000 in FIG. 10, process 1400 in FIG. 14, process 1600 in FIG. 16, process 1800 in FIG. 18 and / or other processes. Memory 2042 stores program codes and data for Node B 110. Communication unit 2044 facilitates communication with system controller 130.

System controller 130 includes a processor / controller 2050, memory 2052, and communication unit 2054. Processor / controller 2050 performs various functions to support communication and paging for UEs, for example, determining which cells are in the paging area of ​​UE 120 and sending paging indicators and paging messages to these cells. Processor / controller 2050 may implement process 1600 in FIG. 16 and / or other processes. Memory 2052 stores program codes and data for system controller 130. Communication unit 2054 facilitates communication with Node B 110.

IS 2 379 149 T3

The paging techniques described herein can be implemented by various means. For example, these techniques can be implemented in hardware, firmware, software, or a combination thereof. For a hardware implementation, the processing units used to support paging in a UE, a Node B, or a system controller can be implemented within one or more application-specific integrated circuits (ASICs), signal processors digital signal processing devices (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), processors, controllers, microcontrollers, microprocessors, electronic devices, other electronic units designed to carry out the functions described herein, or a combination thereof.

For a firmware and / or software implementation, paging techniques can be implemented with modules 10 (eg, procedures, functions, etc.) that perform the functions described herein. Firmware and / or software codes can be stored in a memory (eg, memory 2032, 2042, or 2052 in FIG. 20) and be executed by a processor (eg, processor 2030, 2040, or 2050). Memory can be implemented within the processor or external to the processor.

The above description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be immediately apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples described herein, but should be granted the broadest scope consistent with the novel features and principles disclosed herein.