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    method and apparatus for reporting feedback information for multi-carrier operation. A method and an apparatus for reporting feedback information for multi-carrier operation are described. to more effectively support asymmetric traffic loads in data offloading (downlink), a wireless transmit/receive unit (wtru) is configured with multiple carriers, with one or more unpaired downlink carriers, the carrier of unpaired downlink is an active downlink carrier that does not have a corresponding active uplink carrier. wtru reports feedback information for multi-carrier operation, including feedback for unpaired downlink carrier. for the transmission of the return information to the unpaired downlink carrier, a return channel can be allocated in a distinct resource region not superimposed on an uplink carrier, so that the network can determine which is the downlink carrier to which feedback information received is related, based on the resource region. alternatively, a different return channel can be allocated for the unpaired downlink carrier. alternatively, feedback information can be transmitted via encrypted media access control (mac) feedback.
    公开号:BR112012004235B1
    申请号:R112012004235-1
    申请日:2010-08-25
    公开日:2021-08-24
    发明作者:Lei Wang；Ronald G. Murias；Eldad M. Zeira
    申请人:Interdigital Patent Holdings, Inc；
    IPC主号:
    专利说明:

    CROSS REFERENCE WITH RELATED ORDERS
    [001] This application claims the benefit of provisional application No. US 61/236,912 filed August 26, 2009, the contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION
    [002] Multi-carrier operation improves the achievable throughput and coverage of wireless access systems. In multi-carrier operation, a Wireless Transmit/Receive Unit (WTRU) can be configured and activate more than one frequency carrier in the data uplink (UL) and/or data downlink (DL). Multi-carrier operations allow UL and DL transmission bandwidths to exceed a single carrier frequency and allow more flexible and efficient use of available spectrum.
    [003] For a flexible and efficient use of available spectra and for effective support for asymmetric traffic loads in the DL, a multi-carrier configuration with one or more unpaired DL carriers was proposed. An unpaired DL bearer is a DL bearer that does not have a corresponding UL bearer. For example, in frequency division duplex (FDD) systems, the DL can contain a first 20 MHz carrier and a second 10 MHz carrier, and the UL can have a 20 MHz carrier. the second 10 MHz DL carrier, which does not have a paired UL carrier, is an unpaired DL carrier. Unpaired DL carrier can also occur in time division duplex (TDD) systems. For example, a subscriber can have a first carrier activated in both DL and UL, and a second carrier activated only in DL, where the second carrier with only DL activation is an unpaired DL carrier. Another example of an unpaired DL bearer is a partially configured bearer, which is defined as a DL broadcast-only bearer in TDD, or a DL bearer without a paired UL bearer in FDD. SUMMARY OF THE INVENTION
    [004] A method and a wireless transmit/receive unit (WTRU) for reporting feedback information for multi-carrier operation are described. To effectively support asymmetric traffic loads on the data downlink, a WTRU can be configured with multiple carriers, with one or more unpaired downlink carriers. The unpaired downlink carrier is an active downlink carrier that does not have a corresponding active data uplink carrier. The WTRU reports feedback information for multi-carrier operation, including feedback for the unpaired downlink carrier. For the transmission of the return information to the unpaired downlink carrier, a return channel can be allocated in a distinct resource region not superimposed on the uplink carrier, so that the network can determine for which downlink carrier the information returns received are, based on resource region. Alternatively, a different return channel can be allocated for the unpaired downlink carrier.
    [005] Feedback information for the unpaired downlink carrier can be transmitted, based on a predetermined pattern, on a feedback channel. Feedback information for the unpaired downlink carrier can be transmitted over a physical control channel. Alternatively, the feedback information can be transmitted via Medium Access Control (MAC) coded feedback, such as a MAC signaling header, a MAC subheader, an extended MAC header, a subheader MAC extension, and/or a MAC management message. BRIEF DESCRIPTION OF THE DRAWINGS
    [006] A more detailed understanding can be obtained from the following description, given by way of example, together with the attached drawings, in which: - Figure IA is an exemplary diagram of a communication system in which one or more described embodiments can be implemented; figure 1B is an exemplary diagram of a wireless transmit/receive unit (WTRU) that can be used within the communication system illustrated in figure IA; figure 1C is an exemplary diagram of a radio access network and a core network that can be used within the communication system illustrated in figure IA; - figure 2 is an exemplary flowchart of a process for reporting feedback information for multi-carrier operation; - figure 3 shows a conventional random data generation; figure 4 shows a coding string 400 on a transmission side; Figure 5 shows an exemplary scheme for DL carrier indication, using return channel allocation; - figure 6 shows an exemplary scheme for indicating the DL carrier, using the return channel usage pattern; and - figure 7 shows an example scheme to support feedback for an unpaired DL carrier, with feedback region level allocation. DETAILED DESCRIPTION
    [007] Figure IA is a diagram of an exemplary communications system 100, in which one or more described embodiments can be implemented. Communication system 100 may be a multiple access system that delivers content, such as voice, data, video, messages, broadcast, etc., to multiple wireless users. Communication system 100 may allow multiple wireless users to access this content by sharing system resources, including wireless bandwidth. For example, communication system 100 may employ one or more methods of channel access, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA) , Frequency Division Multiple Access (FDMA), Orthogonal FDMA (OFDMA Orthogonal FDMA), Single Carrier FDMA (SC-FDMA), and so on.
    [008] As shown in Figure 1A, the communication system 100 may include wireless transmit/receive units (WTRUs) 102a, 102b, 102c and 102d, a radio access network (RAN) 104, a core network 106, a public switched telephone network (PSTN) 108, the Internet 110, and other networks 112, although it will be appreciated that the disclosed embodiments contemplate any number of WTRUs, base stations, networks, and /or network elements. Each of the WTRUs 102a, 102b, 102c, 102d can be any type of device configured to operate and/or communicate in a wireless environment. By way of example, the WTRUs 102a, 102b, 102c, 102d can be configured to transmit and/or receive signals wirelessly and can include a user equipment (UE - User Equipment), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA - Personal Digita! Assistant }, a smartphone, a laptop or netbook portable computer, a personal computer, a wireless sensor, electronic devices, and the like.
    [009] The communication system 100 may also include a base station 114a and a base station 114b. Each of the base stations 114a, 114b can be any type of device configured to wirelessly interface with at least one of the WTRUs 102a, 102b, 102c, 102d, to facilitate access to one or more communication networks, such as the central network 106, the Internet 110, and/or networks 112. By way of example, base stations 114a, 114b may be a base transceiver station (BTS), a node B, an e-Node B , a base Node B, a base e-Node B, a site controller, an AP - Access Point, a wireless router, and so on. Although base stations 114a, 114b are each, , described as a single element, it should be appreciated that base stations 114a, 114b can include any number of base stations and/or interconnected network elements.
    [0010] The base station 114a may be part of the RAN 104, which may also include other base stations and/or network elements (not shown), such as a base station controller (BSC). radio network (RNC - Radio Network Controller3}, relay nodes, etc.. Base station 114a and/or base station 114b can be configured to transmit and/or receive signals wirelessly within a particular geographic region , which may be referred to as a cell (not shown). The cell may further be divided into sectors of cells. For example, the cell associated with base station 114a may be divided into three sectors. Thus, in one embodiment, base station 114a may include three transceivers, i.e., one for each sector of the cell. In another embodiment, base station 114a may employ multiple input, multiple output (MIMO) and therefore multiple output technology. , you can use multiple trans receptors for each sector of the cell.
    [0011] Base stations 114a, 114b can communicate with one or more WTRUs 102a, 102b, 102c, 102d over an air interface 116, which can be any appropriate wireless communication link (e.g., radio frequency (RF), microwave, infrared light (IR - Infra Red), ultraviolet (UV), visible light, etc.). The air interface 116 can be established using any suitable Radio Access Technology (RAT).
    [0012] More specifically, as noted above, communication system 100 may be a multiple access system and may employ one or more access channel schemes such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA and the like . For example, base station 114a in RAN 104 and WTRUs 102a, 102b, 102c can implement a radio technology such as a universal mobile telecommunications system (UMTS) terrestrial radio access (UTRA). Universal Mobile Telecommunications System), which can interface over 116 air using wideband CDMA (WCDMA - Wideband CDMA). WCDMA can include communication protocols such as High Speed Packet Access (HSPA) and/or Evolved HSPA (HSPA+). HSPA may include High Speed Downlink Packet Access (HSDPA) and/or High Speed Uplink Packet Access (HSUPA).
    [0013] In another embodiment, the base station 114a and the WTRUs 102a, 102b, 102c may implement a radio technology such as Evolved UMTS Terrestrial Radio Access (E-UTRA) which can interface via Air 116 using Long Term Evolution (LTE - Long Term Evolution) and/or Advanced LTE (LTE-A - LTE-Advanced).
    [0014] In other embodiments, base station 114a and WTRUs 102a, 102b, 102c may implement radio technologies such as IEEE 802.16 [i.e., Worldwide Interoperability for Microwave Access)), CDMA2000, the CDMA2000 IX, CDMA2000 EV-DO, Interim Standard 2000 (IS-2000 - Interim Standard2000), Interim Standard 95 (IS-95 - Interim Standard 95), Interim Standard 856 (IS-856 - Interim Standard 856), Global System for Mobild (GSM), advanced data rates for GSN evolution (EDGE - Enhanced Data rates for GSM Evolutiori), GSM EDGE (GERAN), and so on.
    [0015] The base station 114b in Figure IA may be a wireless router, a base Node B, an e-Node B base, or an access point, for example, and may use any suitable RAT to facilitate wireless connectivity in a localized area, such as a workplace, at home, in a vehicle, on a campus, and so on. In one embodiment, base station 114b and WTRUs 102c, 102d can implement a radio technology, such as IEEE 802.11, to establish a wireless local area network (WLAN). In another embodiment, base station 114b and WTRUs 102c, 102d may implement a radio technology, such as IEEE 802.15, to establish a wireless personal area network (WPAN). In yet another embodiment, base station 114b and WTRUs 102c, 102d may use a cellular based RAT (e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, etc.) to establish a picocell or a femtocell. As shown in Figure 1A, base station 114b may have a direct connection to the Internet 110. Thus, base station 114b may not be required for accessing the Internet 110 through the core network 106.
    [0016] The RAN 104 can be in communication with the central network 106, which can be any type of network configured to provide voice, data, application and/or voice over Internet protocol (VoIP - Voice over Internet) services Protocol) for one or more WTRUs 102a, 102b, 102c, 102d. For example, the core network 106 can provide call control, billing services, mobile location-based services, prepaid calling, Internet connectivity, video distribution, etc., and/or perform high-level security functions. , such as user authentication. Although not shown in Figure IA, it should be appreciated that RAN 104 and/or core network 106 may be in direct or indirect communication with other RANs that employ the same RAT, such as RAN 104, or a different RAT. For example, in addition to being connected to RAN 104, which may be using E-UTRA radio technology, core network 106 may also be in communication with another RAN (not shown) employing GSM radio technology.
    The core network 106 may also serve as a gateway to the WTRUs 102a, 102b, 102c, 102d for accessing the PSTN 108, the Internet 110 and/or other networks 112. The PSTN 108 may include switched telephone networks circuits, which provide traditional telephone service (POTS - Plain Old Telephone Service). The Internet 110 can include a global system of interconnected computer networks and devices that use common communication protocols, such as the Transmission Control Protocol (TCP), the User Data Diagram Protocol (UDP). User Datagram Protocol) and the Internet Protocol (IP) in the TCP/IP Internet Protocols package. Networks 112 may include wired or wireless communication networks owned and/or operated by other service providers. For example, networks 112 may include another core network connected to one or more RANs, which may employ the same RAT as RAN 104 or a different RAT.
    [0018] Some or all of the WTRUs 102a, 102b, 102c, 102d in communication system 100 may include multi-mode capabilities, that is, the WTRUs 102a, 102b, 102c, 102d may include multiple transceivers for communicating with different wireless networks about different wireless links. For example, the WTRU 102c shown in Fig. IA may be configured to communicate with base station 114a, which may employ a cellular based radio technology, and with base station 114b, which may employ an IEEE 802 radio technology.
    [0019] Figure 1B is an exemplary diagram of a system of a WTRU 102. As shown in Figure IB, the WTRU 102 may include a processor 118, a transceiver 120, a transmit/receive element 122, a speaker/ microphone 124, a keyboard 126, a display/touch screen 128, a non-removable memory 106, a removable memory 132, a power supply 134, a global positioning system (GPS) chipset (chip set) System) 136, and other peripherals 138. It should be appreciated that the WTRU 102 may include any sub-combination of the recited elements, while remaining consistent with an embodiment.
    [0020] Processor 118 may be a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a Central DSP, a controller, a microcontroller, application specific integrated circuits (ASICs - Application Specific Integrated Circuits, circuits with FPGA - field programmable gate array (FPGA - Field Programmable Gate Arrafi, any other type of integrated circuit (CL),) a state machine, etc. The processor 118 can perform signal encoding, data processing, power control, input/output processing, and/or any other functionality that allows the WTRU 102 to operate in a free environment. Processor 118 can be coupled to transceiver 120, which can be coupled to transmit/receive element 122. While Figure 1B illustrates the process. For processor 118 and transceiver 120 as separate components, it should be appreciated that processor 118 and transceiver 120 can be integrated together in an electronic package or as a chip.
    [0021] The transmit/receive element 122 may be configured to transmit signals to, or receive signals from, a base station (e.g., base station 114a) over the air interface 116. For example, in one embodiment , the transmit/receive element 122 may be an antenna configured to transmit and/or receive RF signals. In another embodiment, the transmit/receive element 122 may be an emitter/detector configured to transmit and/or receive IR, UV, or visible light signals, for example. In yet another embodiment, the transmit/receive element 122 may be configured to transmit and receive both RF and light signals. It will be appreciated that transmit/receive element 122 may be configured to transmit and/or receive any combination of wireless signals.
    [0022] Furthermore, although the transmit/receive element 122 is depicted in Fig. 1B as a single element, the WTRU 102 can include any number of transmit/receive elements 122. More specifically, the WTRU 102 can employ MIMO technology. Thus, in one embodiment, the WTRU 102 may include two or more transmit/receive elements 122 (e.g., multiple antennas) for transmitting and receiving wireless signals over the air interface 116.
    [0023] The transceiver 120 can be configured to modulate the signals that are transmitted by the transmit/receive element 122, and to demodulate the signals that are received by the transmit/receive element 122. As seen above, the WTRU 102 may have capabilities multi-mode. Thus, transceiver 120 can include multiple transceivers, to allow the WTRU 102 to communicate over multiple RATs, such as UTRA and IEEE 802.11, for example.
    [0024] Processor 118 of WTRU 102 can be coupled to, and can receive user input from, speaker/microphone 124, keyboard 126 and/or display/touch screen 128 [e.g., a display unit Liquid Crystal Display (LCD) or Organic Light Emitting Diode (OLED) type.] The processor 118 can also output user data to the speaker/microphone. 124, to keyboard 126 and/or to display/touch screen 128. In addition, processor 118 can access information from, and store data in, any suitable type of memory, such as non-removable memory 106 and /or Removable Memory 132. Non-removable memory 106 may include Random Access Memory (RAM, Read Only Memory (ROM, a hard disk, or any other type of storage device). Removable memory 132 may include a card. Subscriber Identity Module (SIM), a memory card, a secure digital memory card (SD - Secure Digital), and so on. In other embodiments, processor 118 can access information from, and store data in, memory that is not physically located in the WTRU 102, such as on a server or a home computer (not shown).
    [0025] Processor 118 may receive power from power supply 134, and may be configured to distribute and/or control power to other components in WTRU 102. Power supply 134 may be any device suitable for powering WTRU 102 For example, power supply 134 may include one or more dry batteries [eg, nickel-cadmium (NiCd), nickel-zinc (NiZn), nickel-metal hydride (NiMH), lithium-ion (Li- ion), etc.), solar cells, fuel cells, and the like.
    [0026] Processor 118 can also be coupled to GPS chipset 136, which can be configured to provide location information (e.g., longitude and latitude) regarding the current location of the WTRU 102. In addition to, or instead of, information from the GPS chipset 136, the WTRU 102 can receive location information about the air interface 116 from a base station (e.g., from base stations 114a, 114b), and/or determine its location based on the interval lag of signals being received from two or more neighboring base stations. It should be appreciated that the WTRU 102 can acquire location information by any suitable location or determination method, while remaining consistent with an embodiment.
    [0027] Processor 118 may further be coupled to other peripherals 138, which may include one or more software and/or hardware modules that provide additional features and functionality, and/or wired or wireless connectivity. For example, peripherals 138 may include an accelerometer, an electronic compass, a satellite transceiver, a digital camera (for photographs or video), a Universal Serial Bus (USB) port, a vibration device, a television transceiver, a head-mounted headset/microphone set for hands-free use, a Bluetooth ® module, a frequency modulated (FM) radio unit, a digital music player, a media player, a module for video games, an Internet browser, and so on.
    [0028] Processor 118 is configured to perform, alone or in combination with software, the methods in accordance with one or any combination of the embodiments described herein.
    [0029] Fig. 1C is a system diagram of the RAN 104 and the core network 106, according to an embodiment. The RAN 104 may be an Access Service Network (ASN) that employs IEEE 802.16 radio technology to communicate with the WTRUs 102a, 102b, 102c through the air interface 116. As will be discussed below, the communication links between the different functional entities of the WTRUs 102a, 102b, 102c, RAN 104, and core network 106 can be defined as reference points.
    [0030] As shown in Fig. 1C, RAN 104 may include base stations 140a, 140b, 140c, and an ASN gateway 142, although it should be appreciated that RAN 104 may include any number of base stations and gateways. ASN, while remaining consistent with an embodiment. Base stations 140a, 140b, 140c may be associated with each particular cell (not shown) in RAN 104 and may each include one or more transceivers for communication with WTRUs 102a, 102b, 102c over the air interface 116 In one embodiment, base stations 140a, 140b, 140c can implement MIMO technology. Thus, base station 140a, for example, can use multiple antennas to transmit wireless signals to and receive wireless signals from the WTRU 102a. Base stations 140a, 140b, 140c can also provide mobility management functions such as transition triggering, tunneling, radio resource management, traffic classification, QoS (Quality of Service) policy enforcement , and so on. ASN gateway 142 can serve as a traffic aggregation point, and can be responsible for paging services, for caching subscriber profiles, for routing to core network 106, and so on. on.
    [0031] The air interface 116 between the WTRUs 102a, 102b, 102c and the RAN 104 can be defined as an RI reference point that implements the IEEE 802.16 specification. In addition, each of the WTRUs 102a, 102b, 102c can establish a logical interface (not shown) with the core network 106. The logical interface between the WTRUs 102a, 102b, 102c and the core network 106 can be defined as a point of R2 reference, which can be used for authentication, authorization, IP host configuration management and/or mobility management.
    [0032] The communication link between each of the base stations 140a, 140b, 140c can be defined as a reference point R8 that includes the protocols to facilitate WTRU transitions and data transfer between base stations. The communication link between the base stations 140a, 140b, 140c and the ASN gateway 215 can be defined as a reference point R6. Reference point R6 can include protocols to facilitate mobility management based on mobility events associated with each of the WTRUs 102a, 102b, 102c.
    [0033] As shown in Figure 1C, the RAN 104 can be connected to the core network 106. The communication link between the RAN 104 and the core network 106 can be defined as a reference point R3 which includes the protocols to facilitate the transfer of data and mobility management capabilities, for example. The core network 106 may include a Mobile IP Home Agent (MIP-HA) 144, an Authentication, Authorization, Accounting (AAA) server 146, and a gateway 148. if one of the above elements is described as part of the core network 106, it should be appreciated that any of these elements may be owned and/or operated by an entity other than the core network operator.
    [0034] The MIP-HA may be responsible for managing IP addresses, and may allow WTRUs 102a, 102b, 102c to transit between different ASNs and/or different core networks. The MIP-HA 144 can provide the WTRUs 102a, 102b, 102c with access to packet-switched networks, such as the Internet 110, to facilitate communications between the WTRUs 102a, 102b, 102c and IP-enabled devices. AAA server 146 may be responsible for user authentication and user support services. Gateway 148 can facilitate interworking with other networks. For example, gateway 148 can provide WTRUs 102a, 102b, 102c with access to circuit-switched networks, such as PSTN 108, to facilitate communications between WTRUs 102a, 102b, 102c and traditional land-line communication devices . In addition, gateway 148 may provide WTRUs 102a, 102b, 102c with access to networks 112, which may include other wired or wireless networks that are owned and/or operated by other service providers.
    [0035] Although not illustrated in Fig. 1C, it should be appreciated that RAN 104 can be connected to other ASNs, and core network 106 can be connected to other core networks. The communication link between the RAN 104 and other ASNs can be defined as a reference point R4 which can include the protocols for coordinating the mobility of the WTRUs 102a, 102b, 102c between the RAN 104 and the other ASNs. The communication link between the core network 106 and other core networks can be defined as a reference point R5, which can include the protocols to facilitate the interworking between the core core networks and the visited core networks.
    [0036] Figure 2 is an exemplary flowchart of a process to report return information for multi-carrier operation. A WTRU is configured, and activated, by a plurality of DL carriers and by at least one data uplink carrier in both FDD or TDD mode and FDD half-duplex mode. The WTRU receives data downlink transmissions over at least two DL carriers, including an unpaired DL carrier (202). The unpaired DL carrier is an active DL carrier that does not have a corresponding active UL carrier.
    [0037] The WTRU then sends the feedback information for the unpaired DL bearer, with or without the feedback information for the paired DL bearer, on an activated UL bearer (204). For multi-carrier DL operation, the WTRU needs to transmit the UL feedback information to the base station (or any other network entity) for both a paired DL bearer and an unpaired DL bearer. Feedback information can include DL physical layer (PHY) measurement, such as Carrier to Interference and Noise Ratio (CINR - Carrier to Interference and Noise Ratio'), operation-related feedback information of MIMO, the feedback of positive/negative acknowledgment (ACK/NACK - Positive/Negative Acknowledgment) of Hybrid Automatic Repeat Request (HARQ), the subscriber's suggestion about the DL operation (for example, the DL modulation and the subscriber's preferred encoding systems, etc.), or any other information.
    [0038] The DL carrier with which the return information is associated can be implicitly or explicitly indicated, and this will be explained below in more detail. The activated UL bearer can be either a primary UL bearer or a secondary UL bearer.
    [0039] Feedback information can be sent over a physical control channel (such as a fast feedback channel, a Channel Quality Indication Channel (CQICH), an ACK channel /NACK of HARQ and the like, as specified in IEEE 802.16m), or through Medium Access Control (MAC) coded returns (such as a signaling header, an extended header, a MAC subheader or an extended MAC subheader, and MAC management messages, and the like), or any other messaging mechanism that can be applied at different protocol layers.
    [0040] The embodiments for sending feedback information for the unpaired DL bearer and for identifying the DL bearer for the transmitted feedback information are explained below. It should be noted that although the embodiments are explained with reference to an IEEE 802.16m system using the terminologies and types of channels and messages specific to IEEE 802.16m, the embodiments are equally applicable to any types of wireless communication systems , including, but not limited to, LTE or LTE-A of the Third Generation Partnership Project (3GPP - Third Generation Partnership Project).
    [0041] In accordance with one embodiment, the return information for the unpaired DL carrier(s) [with or without return information for the paired DL carrier(s) (s)] can be reported through a physical control channel on an activated UL carrier. For example, the physical control channel at 802.16m can be a fast feedback channel [ie, a channel quality indication channel (CQICH)], a HARQ channel, or the like. The activated UL bearer through which the feedback information is transmitted can be a primary UL bearer or a secondary activated UL bearer. Return information can be information about any DL bearers, including paired or unpaired enabled DL bearers.
    [0042] The DL bearer to which the transmitted return information is related can be identified by a DL bearer identifier (or any equivalent), which is implicitly or explicitly encoded in the return information. Alternatively, the DL bearer can be implicitly identified by the return allocation. Return allocation can be either at the return channel level or at the return region level, which will be explained in more detail below.
    [0043] Exemplary embodiments for sending feedback information to the unpaired DL carrier(s) via a physical control channel are explained with reference to 802.16m. In IEEE 802.16m, a primary fast feedback control channel (PFBCH), a secondary fast feedback control channel (SFBCH), or a HARQ feedback control channel (HFBCH - HARQ Feedback Control Channel) can be used to report feedback information.
    [0044] Each PFBCH carries 6 bits of information, providing broadband channel quality feedback, MIMO feedback and so on. Physical resources for the PFBCH are allocated to the WTRU by an Information Element (IE) of an Advanced Allocation Mafi (A-MAP) in the DL. The PFBCH starts at a predetermined location (ie, in the return region), with the size (both of the subcarrier and OFDM symbol) defined in a DL broadcast control message.
    [0045] Each SFBCH carries 7 to 24 bits of information, providing narrowband channel quality feedback, MIMO feedback, and so on. Physical resources for the SFBCH are allocated to the WTRU through a return allocation A-MAP IE. The SFBCH starts at a predetermined location (ie in the return region), with the size defined in a DL broadcast control message. A fallback region is an UL resource allocation on an activated UL bearer that comprises a plurality of resource units, where a resource unit is the smallest resource allocation granularity. In IEEE 802.16m, a resource unit comprises 18 subcarriers plus 6 OFDM symbols.
    [0046] Each HFBCH carries one bit of information, providing an ACK (positive acknowledgment) or a NACK (negative acknowledgment) for a DL HARQ packet. The HFBCH is allocated to the WTRU through the HARQ Feedback Allocation (HFA) field in the same DL A-MAP IE that specifies the DL allocation for the DL HARQ packet. Such DL A-MAP IEs include a DL base allocation A-MAP IE, a DL individual persistent A-MAP IE, a DL composite persistent A-MAP IE, and an A-MAP IE of DL group resource allocation.
    [0047] The identity of the DL bearer can be explicitly included in the return information encoded in the PFBCH or the SFBCH. Alternatively, in order to reduce the number of bits to specifically indicate the identity of the DL carrier, a compression scheme can be implemented. For example, the base station can signal a list of its component carriers and the WTRU can use the component carriers index in the list as a substitute for the DL carrier identifier. If the number of carriers of any cells is not very large, 2 or 3 bits may be enough.
    [0048] Alternatively, the identity of the DL bearer can be implicitly indicated by modifying the physical layer signals in a way that allows the base station to determine to which DL bearer the feedback information is related.
    [0049] According to one embodiment, a pilot sequence may be modified to indicate the identity of the DL bearer with which the feedback information is associated. In IEEE 802.16m, the SFBCH comprises three (3) distributed mini-feedback blocks (FMTs - Feedback Mini-Tiled), and each FMT includes two pilot symbols (i.e., six pilot symbols per SFBCH). may be [1 1 1 1 1 1]. According to one embodiment, the pilot sequence may be modified to create other pilot sequences that match other DL carrier identifiers (i.e., a different pilot sequence may be used for the feedback information for a different DL carrier). The pilot sequences may or may not be orthogonal to each other. The base station compares the pilot sequence received on the SFBCH with all possible sequences to determine which DL carrier identifier matches to the feedback information transmitted on the SFBCH. Alternatively, the receiver can try to decode the data using every possible pilot sequence, to check the validity of the data (using a cyclic redundancy check ca - CRC - Cyclic Redundance Check}. The carrier identifier can be used as a CRC mask in the data. In this case, every possible mask is used at the receiver until the CRC proceeds to determine which carrier identifier was used at the transmitter to mask the CRC.
    [0050] In IEEE 802.16m, data randomization is performed on each data save, using a random data generator shown in figure 3. As shown in figure 3, the input bit stream is mixed with a bit stream generated by the random generator. Randomization (or randomization) of data is performed to avoid long strings of ones or zeros. Randomness is initialized with a predetermined sequence. According to another embodiment, the random generator initialization sequence may be selected depending on the downlink carrier to which the feedback information is related, so as to indicate which DL carrier identifier the current feedback information is related to. (ie the random generator can be initialized with a different sequence to return information for a different DL carrier).
    [0051] Figure 4 shows a coding string 400 on the transmission side. When a random generator 402 is loaded with a sequence based on the DL carrier identifier, the random generator 402 produces a random stream that is unique for the data and the preloaded sequence. A CRC is added to the output of random generator 402 by CRC add block to FEC block 403. The data input for random generator 402 also has a CRC (a salvo) added by CRC Salvo add block 401. At the receiver, the FEC block can be checked by means of the CRC check, and then different preloaded sequences from the random generator can be tried until the CRC saves pass, which will provide the DL carrier identifier.
    [0052] To determine which DL carrier identifier is being referenced, the base station can experiment on the random generator each of the pre-determined preloaded sequences.
    [0053] According to another embodiment, the DL carrier can be implicitly indicated based on the feedback (return) allocation. Two levels of return allocations are available for this purpose: the return channel level and the return region level.
    [0054] One or more feedback channels can be formed into a resource unit, depending on the structure of the feedback channel. Multiple return channels can be allocated to a return region. In IEEE 802.16m, UL fast return channels, including both the PFBCH and the SFBCH, are allocated or deallocated to the WTRUs by the A-MAP IE of the return allocation. Table 1 shows the basic structure of the A-MAP IE of the return allocation at 802.16m. Table 1

    [0055] A "DL Carrier Identifier" field can be added to the Return Allocation A-MAP IE to indicate the DL carrier to which the return channel is allocated, so that a separate return channel can be allocated to each DL carrier. Alternatively, the DL carrier identifier can be used as a part of the mask for the CRC. At 802.16m, the CRC field is masked with a station ID (STID - Station ID}, k STID is 12 bits long and the CRC field is 16 bits long, so the remaining 4 bits of CRC can be masked with a masking code containing the DL bearer identity information to indicate which DL bearer the return channel allocation is destined.
    [0056] Multiple feedback channels can be allocated to a WTRU, and the WTRU can send feedback information for a specific DL carrier on the corresponding feedback channel, so that the base station recognizes for which DL carrier the feedback information feedback received is destined, based on the feedback channel on which feedback information is received. Return channels can be allocated to a WTRU by using the return allocation A-MAP IE multiple times, or by using a modified version of the return allocation A-MAP IE to allocate multiple channels. return to the same WTRU.
    [0057] Figure 5 shows an exemplary scheme to indicate the DL carrier, using return channel allocation. In Figure 5, a WTRU has three activated carriers, Carrier-1, Carrier-2, and Carrier-3. Carrier-1 is activated in both DL and UL, Carrier-2 is activated only in DL, and Carrier-3 is a DL-only carrier. Carrier-2 and Carrier-3 are unpaired DL carriers. In Figure 5, multiple return channels are allocated to the WTRU in the UL bearer's return region, and the WTRU sends the return to Carrier-1, Carrier-2 and Carrier-3 in the allocated corresponding return channel, respectively. .
    [0058] Alternatively, the DL carrier information can be implicitly indicated by mapping the return channels to the DL carriers, instead of explicitly using a DL carrier identifier field in the return allocation IE. Multiple return channels can be allocated to a WTRU either by using the conventional return allocation A-MAP IE multiple times or by using a modified version of the return allocation A-MAP IE to allocate multiple return channels for the same WTRU. Allocated return channels can have a one-to-one correspondence with DL carriers. This match can be specified by MAC signaling during the initialization of the multi-carrier operation for the WTRU, or by a predefined mapping scheme. For example, the lowest channel index of the return channel can be assigned to the return of the default DL carrier, and the remaining return channels can be mapped to the unpaired DL carriers in the same order as the index of return channel that the carriers index.
    [0059] Alternatively, a return channel can be assigned to a WTRU and multiple DL carriers can share the single return channel in the time domain, and a pre-established return channel usage pattern can be defined between the base station and the WTRU. The return usage pattern implicitly indicates the DL carrier information for return, sent on the return channel at a specific time. Figure 6 shows an exemplary scheme to indicate the DL carrier, using the return channel usage pattern. In Figure 6, a WTRU has two activated carriers, Carrier-1 and Carrier-2. Carrier-1 is activated in both DL and UL, and Carrier-2 is activated only in DL. Carrier-2 is an unpaired DL carrier. In Figure 6, a return channel is allocated to the WTRU periodically every two frames. The WTRU and the base station have a pre-set return channel usage pattern for sending return for multiple DL carriers. For example, the WTRU can send the return to the DL bearers in the form of a round robin (ie Carrier-1, Carrier-2, Carrier-1, Carrier-2, Carrier-1,...). The return channel usage pattern can be predetermined or specified in a standardized specification or negotiated between the base station and the WTRU (for example, during the multi-carrier operation initialization process).
    [0060] Alternatively, a separate return region can be allocated to a different DL bearer, and all the return channels for the DL bearer can be assigned to WTRUs in the corresponding return region. In IEEE 802.16m, a return region is allocated at a predetermined location, with the size specified in DL control signals [eg, by superframe header (SFH - SuperFrame Header)]. The base station may allocate a separate return region (i.e., a distinct non-overlapping region) for each DL carrier, including paired and unpaired DL carriers. The location and size of the return control region for an unpaired DL carrier can be specified in DL control signals (eg by superframe header, or in MAC management messages). Separate return regions can be assigned in the time domain and/or frequency domain.
    [0061] Figure 7 shows an example scheme to support the return for an unpaired DL carrier, with return region level allocation. In figure 7, a WTRU has three activated carriers, Carrier-1, Carrier-2, and Carrier-3. Carrier-1 is activated in both DL and UL, Carrier-2 is activated only in DL, and Carrier-3 is a DL-only carrier. Carrier-2 and Carrier-3 are unpaired DL carriers. In Figure 7, three distinct return regions are allocated to the WTRU for Carrier-1, Carrier-2, and Carrier-3; the WTRU sends the return of the DL carriers on the allocated return channel in the corresponding allocated return region.
    [0062] The above described embodiments can be used to send HARQ ACK/NACK feedback, too. HARQ ACK/NACK feedback is different from DL channel feedback in the following respects. HARQ ACK/NACK occurs per HARQ packet, while DL channel feedback occurs per WTRU per DL channel. HARQ ACK/NACK usually carries one bit of information, whereas DL channel feedback requires more bits of information. The HARQ ACK/NACK allocation for a HARQ packet is usually specified in conjunction with the HARQ packet allocation implicitly or explicitly, whereas the DL channel fallback is usually specified by a fallback channel allocation IE, and the return channel allocation to a subscriber may be periodic.
    [0063] In the transmission of HARQ ACK/NACK to unpaired DL carriers, the DL carrier information can be provided implicitly or explicitly in the HARQ ACK/NACK allocation, both at the ACK/NACK channel level and at the ACK/NACK region level. A separate HARQ ACK/NACK channel can be allocated for each DL carrier, and a HARQ feedback for the unpaired DL carrier can be sent through the corresponding HARQ channel. Alternatively, a separate HARQ region can be allocated for each DL carrier, and the HARQ feedback for the unpaired DL carrier can be sent through an assigned channel in the corresponding HARQ region.
    [0064] Information about the UL bearer carrying the HARQ ACK/NACK for an unpaired DL bearer and the allocation of the HARQ ACK/NACK region can be predetermined (for example, by the primary UL bearer and by a known location), or signaled by DL PHY control signaling or by a MAC control message.
    [0065] Alternatively, multiple HARQ ACKs/NACKs can be aggregated (i.e., one HARQ feedback is transmitted for multiple packets). With aggregated ACK/NACK, the HARQ returns of two or more HARQ packets undergo a logical "AND" operation, being joined in such a way that an ACK is generated if all packets have been successfully decoded, and a NACK is generated if at least one packet is not successfully decoded. Upon receipt of a NACK, the base station retransmits all relevant packets. This scheme can save uplink resources at the cost of any redundant downlink retransmissions.
    [0066] In accordance with another embodiment, the return information for the unpaired DL holder [with or without return information for the paired DL holder(s)] can be reported, through of MAC encoded return (for example, in MAC signal headers, subheads, extended headers or extended subheaders, or in MAC management messages, etc.) for an activated UL bearer. The activated UL bearer can be either the primary UL bearer or an activated secondary UL bearer. The MAC encoded callback can contain the feedback information for DL bearers, including paired or unpaired DL bearers enabled. The DL carrier for specific feedback information transmitted in MAC header, sub-header, extended header or coded messages can be identified by its DL carrier identifier provided in the MAC coded feedback information, or by a cyclic redundancy check (CRC ) which is masked by the DL carrier identifier or its equivalent.
    [0067] In order to minimize MAC management or overall control, MAC coded feedback to support unpaired DL carriers can selectively include some of the feedback information. For example, the DL bearer identifier may not be included in the MAC coded return when the return is for the default DL bearer, where the default DL bearer is the DL bearer corresponding to the UL bearer where the feedback is transmitted. Another example is that the MAC coded feedback may not include the feedback information for the paired DL bearer under consideration that the fast feedback channels for the paired DL bearers provide sufficient feedback information.
    [0068] The embodiments to provide feedback for unpaired DL carrier via MAC coded feedback in multi-carrier operation in IEEE 802.16m are explained below. MAC management messages (report request and report response messages) can be defined for the base station to request a WTRU to provide a DL channel return report and for the WTRU to report the channel return from DL to base station for multi-carrier operation. The WTRU reporting response can be sent as a response to a base station request, or in an unsolicited manner. Table 2 shows the format of the 802.16 MAC management message. Table 2


    [0069] In order to support multi-carrier operations with unpaired DL carrier configurations, and allow a single report request and a report response message to request and report returns for multiple DL carriers, for better efficiency of MAC control, the DL bearer information can be included in the report request or report response messages. Table 3 and Table 4 show examples of report request and report response messages with information from a DL holder, respectively. In Tables 3 and 4, two 1-bit indicators are used to indicate the inclusions of the default DL carrier and/or non-default DL carrier. The default DL bearer is the DL bearer paired with the UL bearer where the report response will be transmitted.
    [0070] In the report request message in Table 3, the "default DL carrier report request included" indicator indicates whether this report request message includes the report request for the default DL carrier, and the flag The "non-standard DL bearer report request included" indicates whether this report request includes the reporting requests for the non-standard DL bearer. The report request includes the "DL bearer index" field, indicating the DL bearer for the requested content. Table 3



    [0071] In the report response message of Table 4, the "default DL carrier report included" and "non-default DL carrier report included" flags indicate whether the report for the default DL carrier and the reports for the non-default DL bearer are included in this report response message, respectively. The report response message may include the "DL carrier index" field indicating the DL carrier for the report content. Table 4

    [0072] Report request and report response messages can be used to report the non-standard DL carrier(s), which would be useful when there is a fast return channel allocated in the UL for the carrier of standard DL. Alternatively, report request and report response messages can be used to report the default DL carrier, which would be useful when paired DL carriers are asked to have return information. When more than one non-default DL carrier is included in the report response, a list of DL carrier identifiers and corresponding report contents can be included in the report response message.
    [0073] Alternatively, a MAC return signaling header can be used for report request and report response for unpaired DL bearer channel return. Table 5 shows the basic format of MAC signaling headers in 802.16m. No payload follows the MAC signaling header. The MAC signaling header includes bits for the content of the signaling header. Table 5


    [0074] Table 6 shows an example of MAC signaling header in 802.16m that can be used by the WTRU to provide the base station with the feedback for the DL multi-carriers ("return content" field in Table 6 ). A "DL carrier index" field is used to indicate the DL carrier associated with the return. Table 6


    [0075] The "station identifier" (STID) field may not be necessary when the MAC signaling header is transmitted in the UL allocation specifically assigned to the WTRU, and the "DL carrier index" field may not be required when the feedback is for the DL bearer paired with the UL bearer where the feedback is transmitted. In such cases, the STID and the DL carrier index may not be included in the MAC signaling header, respectively. In order to indicate the existence of STID and DL carrier index, special flags (STID include flag and DL carrier index include flag) can be included in MAC signaling header, respectively. Table 7 shows an example MAC signaling header with STID include flag and DL carrier index include flag. Table 7


    [0076] DL CINR report can be followed by MAC bandwidth request signaling header without STID field. Table 8 shows an example of the CINR report followed by the Bandwidth Request (BR - Bandwidth Request) signaling header without STID. In Table 8, two fields ("DL Carrier Index" and "CINR") are added to the bandwidth request signaling header. The "DL carrier index" field indicates the DL carrier to which the included CINR refers, and the "CINR" field indicates the CINR measured by the WTRU. Table 8

    [0077] At 802.16m, the MAC coded return can be included in an extended MAC header. Table 9 shows the basic format of the extended MAC header at 802.16m. Table 9

    [0078] Table 10 shows an example of an extended MAC header that can be used by the WTRU to provide feedback for the DL carriers. The extended MAC header includes a "return content" field for the return parameter values, and a "DL carrier index" field to indicate the DL carrier associated with the return. Table 10


    [0079] Although features and elements are described above in particular combinations, those of ordinary skill in the art will appreciate that each feature or element can be used alone or in any combination with other features and elements. In addition, the methods described herein may be implemented in a computer program, in software or firmware embedded in a computer-readable medium, to be executed by a computer or processor. Examples of computer-readable media include electronic signals (transmitted through wired or wireless connections) and computer-readable storage media. Examples of computer readable storage media include, but are not limited to, a read-only memory (ROM), a random access memory (RAM), a register, a cache memory, semiconductor memory devices, magnetic media such as internal hard drives and removable disks, magneto-optical media and optical media such as CD-ROM discs and digital versatile discs (DVDs). A processor in association with the software can be used to implement a radio frequency transceiver for use in a WTRU, UE, terminal, base station, RNC, or any host computer.
    权利要求:
    Claims (18)
    [0001]
    1. Method for use in a wireless transmit/receive unit (WTRU) (102) for reporting feedback information for multi-carrier operation in wireless communication comprising: - receiving downlink data transmissions through each of the at least two downlink carriers using orthogonal frequency division multiple access (OFDM A); - receiving an allocation of a plurality of resources associated with a single uplink control channel associated with a single uplink carrier; characterized by: - determining, based on at least two downlink carriers, at least one resource from the plurality of resources allocated to the single uplink control channel to be used to transmit the positive acknowledge/negative acknowledgment (ACK/ NACK) of the hybrid automatic repeat request (HARQ) for downlink data transmissions received over at least two downlink carriers; and - transmitting ACK/NACK feedback information for downlink data transmissions received over at least two downlink carriers via the determined at least one resource using the single uplink control channel.
    [0002]
    2. Method according to claim 1, characterized in that each of the plurality of allocated resources is associated with a plurality of subcarriers.
    [0003]
    A method according to claim 1, characterized in that the WTRU (102) is an 802.16 WTRU.
    [0004]
    A method according to claim 1, characterized in that the WTRU (102) is a WTRU (102) using advanced long-term evolution (LTE) (LTE-A)
    [0005]
    Method according to claim 1, characterized in that the downlink carriers to which the feedback information is related are indicated by distinct pilot sequences, which are associated with the downlink carriers and transmitted together with the feedback information.
    [0006]
    Method according to claim 1, characterized in that it further comprises: - transmitting the uplink data over a plurality of uplink carriers.
    [0007]
    Method according to claim 1, characterized in that the feedback information is transmitted via at least one medium access control (MAC) signaling header, a MAC sub-header, an extended MAC header, a sub-header extended MAC, or a MAC management message.
    [0008]
    Method according to claim 1, characterized in that the bearer identity information is included in the return information.
    [0009]
    9. Method according to claim 1, characterized in that the bearer identity information is included in a return allocation.
    [0010]
    10. Wireless transmit/receive unit (WTRU) (102) for reporting feedback information for multi-carrier operation in wireless communication using the method as defined in claim 1, comprising: - a receiver (120) configured to receive downlink data transmissions over the at least two downlink carriers, the data being received on each of the at least two downlink carriers using orthogonal frequency division multiple access (OFDMA); - the receiver (120) is configured to receive an allocation of a plurality of resources associated with a single uplink control channel associated with a single uplink carrier; characterized by: - a processor (118) configured to determine, based on at least two downlink carriers, at least one resource from the plurality of resources allocated to the single uplink control channel to use to transmit the acknowledgment feedback information positive/negative acknowledgment (ACK/NACK) of the hybrid auto-repeat request (HARQ) for downlink data transmissions received over at least two downlink carriers; and - a transmitter (120) configured to send the ACK/NACK feedback information for downlink data transmissions received over at least two downlink carriers via the determined at least one resource using the single uplink control channel;
    [0011]
    11. WTRU (102) according to claim 10, characterized in that each of the plurality of allocated resources is associated with a plurality of subcarriers.
    [0012]
    A WTRU (102) according to claim 10, characterized in that the WTRU is an 802.16 WTRU.
    [0013]
    A WTRU (102) according to claim 10, characterized in that the WTRU (102) is a WTRU (102) using advanced long-term evolution (LTE) (LTE-A).
    [0014]
    A WTRU (102) according to claim 10, characterized in that the transmitter (120) is configured to send distinct pilot sequences, along with the feedback information, based on the downlink carriers to which the feedback information is related. .
    [0015]
    The WTRU (102) of claim 10, further comprising: the transmitter configured to transmit the uplink data over a plurality of uplink carriers.
    [0016]
    16. WTRU (102) according to claim 10, characterized in that the processor is configured to transmit the feedback information via at least one medium access control signaling (MAC) header, a MAC sub-header, a extended MAC header, an extended MAC sub-header, or a MAC management message.
    [0017]
    A WTRU (102) according to claim 10, characterized in that the bearer identity information is included in the feedback information.
    [0018]
    18. WTRU (102) according to claim 10, characterized in that the bearer identity information is included in a return allocation.
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    法律状态:
    2020-12-08| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04L 5/02 , H04L 1/00 Ipc: H04L 1/00 (2006.01), H04L 5/02 (2006.01) |
    2020-12-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-12-08| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-22| B25G| Requested change of headquarter approved|Owner name: INTERDIGITAL PATENT HOLDINGS, INC (US) |
    2021-06-22| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-08-24| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 25/08/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
    优先权:
    申请号 | 申请日 | 专利标题
    US23691209P| true| 2009-08-26|2009-08-26|
    US61/236,912|2009-08-26|
    PCT/US2010/046612|WO2011025816A1|2009-08-26|2010-08-25|Method and apparatus for reporting feedback information for multi-carrier operation|
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