Single-block coded channel state information (CSI) design for new radio (NR) multiple-input multiple-output (MIMO)

Abstract

In summary, certain aspects of this disclosure relate to methods and apparatus for generating and encoding bits for CSI reports. In some cases, the UE may determine the payload size for the Channel State Information (CSI) report based at least in part on the supported rank; calculate the packet length for the CSI report based on the determined payload size; and encode the CSI for a selected CSI Resource Index (CRI) based on the payload size and the calculated packet length to generate encoded packets.

Description

[0001] Cross-reference to related applications & claiming priority

[0002] This application claims the benefit of and priority to International Patent Cooperation Treaty Application No. PCT / CN2017 / 105237, filed on October 2, 2017, which is assigned to the assignee of this application and is hereby expressly incorporated herein by reference as if fully set forth below and for all applicable purposes. Technical Field

[0003]

[0011] Generally speaking, certain aspects of the present disclosure relate to transmitting and encoding bits of channel state information (CSI). Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). Examples of such multiple access technologies include Long Term Evolution (LTE) systems, Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems.

[0005] In some examples, a wireless multiple access communication system may include multiple base stations, each base station simultaneously supporting communication for multiple communication devices (also referred to as user equipment (UE)). In an LTE or LTE-A network, a set of one or more base stations may define an evolved Node B (eNB). In other examples (e.g., in a next generation or 5G network), a wireless multiple access communication system may include multiple distributed units (DU) (e.g., edge units (EU), edge nodes (EN), radio heads (RH), smart radio heads (SRH), transmit receive points (TRP), etc.) communicating with multiple central units (CU) (e.g., central nodes (CN), access node controllers (ANC), etc.), wherein a set of one or more distributed units communicating with the central unit may define an access node (e.g., new radio base station (NR BS), new radio node B (NR NB), network node, 5G NB, gNB, etc.). A base station or DU may communicate with a set of UEs on a downlink channel (e.g., for transmission from a base station to a UE) and an uplink channel (e.g., for transmission from a UE to a base station or a distributed unit).

[0006] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. An example of an emerging telecommunication standard is New Radio (NR), for example, 5G radio access. NR is an enhancement set to the LTE mobile standard released by the Third Generation Partnership Project (3GPP). It is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using OFDMA with cyclic prefix (CP) on the downlink (DL) and on the uplink (UL), so as to better support mobile broadband Internet access, as well as support beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0007] Additionally, NR is expected to introduce new encoding and decoding schemes that improve the transmission and reception of data. For example, polar codes are currently considered candidates for error correction in next-generation wireless systems such as NR. Polar codes are a relatively new breakthrough in coding theory that have been shown to asymptotically reach Shannon capacity (for code sizes N approaching infinity). However, while polar codes perform well at large values ​​of N, for lower values ​​of N, the minimum distance of polar codes is poor, which has led to the development of techniques such as successive elimination list (SCL) decoding, which utilizes a simple outer code with excellent minimum distance (such as CRC or parity check) over a polar inner code, resulting in a combined code with excellent minimum distance.

[0008] However, as the demand for mobile broadband access continues to grow, there is a need for further improvements to NR technology, such as further improvements to the encoding and decoding schemes used for NR. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies. Summary of the invention

[0009] Some aspects of the present disclosure are summarized below to provide a basic understanding of the technology discussed. This overview is not an exhaustive review of all expected features of the present disclosure, and is neither intended to identify key or important elements of all aspects of the present disclosure, nor is it intended to describe the scope of any or all aspects of the present disclosure. Its sole purpose is to provide some concepts of one or more aspects of the present disclosure in a simplified form as a prelude to a more detailed description given later.

[0010] According to certain aspects of the present disclosure, certain aspects of the present disclosure provide a method of wireless communication. In summary, the method includes: determining a payload size for a channel state information (CSI) report based at least in part on a supported rank; calculating a packet length for the CSI report based on the determined payload size; and encoding the CSI for a selected CSI resource index (CRI) based on the payload size and the calculated packet length to generate a coded packet.

[0011] The technology may be embodied in methods, devices, and computer program products. After reviewing the following description of specific, exemplary embodiments of the present invention in conjunction with the accompanying drawings, other aspects, features, and embodiments of the present invention will become apparent to those skilled in the art. Although the features of the present invention may be discussed below with respect to certain embodiments and the accompanying drawings, all embodiments of the present invention may include one or more of the advantageous features discussed herein. In other words, although one or more embodiments may be discussed as having certain advantageous features, one or more of these features may also be used according to the various embodiments of the present invention discussed herein. In a similar manner, although the exemplary embodiments may be discussed below as device, system, or method embodiments, it should be understood that these exemplary embodiments may be implemented in various devices, systems, and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order that the above-mentioned features of the present disclosure may be understood in detail, a more specific description (briefly summarized above) may be made by reference to the aspects, some of which are shown in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting its scope, as the description may admit of other equally effective aspects.

[0013] Figure 1 is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0014] Figure 2 is a block diagram illustrating an example logical architecture of a distributed RAN in accordance with certain aspects of the present disclosure.

[0015] Figure 3 is a diagram illustrating an example physical architecture of a distributed RAN in accordance with certain aspects of the present disclosure.

[0016] Figure 4 is a block diagram conceptually illustrating designs of example BS and user equipment (UE) in accordance with certain aspects of the present disclosure.

[0017] Figure 5is a diagram illustrating an example for implementing a communication protocol stack in accordance with certain aspects of the present disclosure.

[0018] Figure 6 A block diagram of an example wireless device in accordance with certain aspects of the present disclosure is shown.

[0019] Figure 7 Examples of DL-centric subframes in accordance with certain aspects of the present disclosure are shown.

[0020] Figure 8 Examples of UL-centric subframes in accordance with certain aspects of the present disclosure are shown.

[0021] Fig. 9

[0013] Example operations for wireless communications in accordance with certain aspects of the present disclosure are shown.

[0022] Fig.10 An example table is shown that may be used to determine a maximum CSI payload in accordance with certain aspects of the present disclosure.

[0023] Fig.11 An example mapping of coded bits in accordance with certain aspects of the present disclosure is shown.

[0024] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one embodiment may be beneficially utilized on other embodiments without specific recitation. DETAILED DESCRIPTION

[0025] Aspects of the present disclosure provide devices, methods, processing systems, and computer-readable media for encoding bits of information. Such encoding can be used, for example, for compression or storage, or for transmission in a network including a wireless network. For example, such encoding can be applied to a new radio (NR) (new radio access technology or 5G technology) wireless communication system. It should be understood that although aspects of the present disclosure are proposed with respect to a wireless communication system, the technology provided herein is not limited to such a wireless communication system. For example, the technology provided herein can be equally applied to compression or storage, or to other communication systems, such as optical fiber communication systems, hard-line copper communication systems, etc. In other words, the technology provided herein can be applied to any system using an encoder.

[0026] NR can support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., more than 80 MHz), millimeter wave (mmW) targeting high carrier frequency (e.g., 27 GHz or more), massive MTC (mMTC) targeting non-backward compatible MTC technology, and / or mission critical services targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet corresponding quality of service (QoS) requirements. In addition, these services can coexist in the same subframe.

[0027] Example Wireless Communication System

[0028] The techniques described herein can be used for various wireless communication networks, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, and the like. UTRA includes Wideband CDMA (WCDMA), Time Division Synchronous CDMA (TD-SCDMA), and other variants of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network can implement radio technologies such as Global System for Mobile Communications (GSM). An OFDMA network can implement radio technologies such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Flash- The radio technology of etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and Improved LTE (LTE-A) (in both frequency division duplex (FDD) and time division duplex (TDD)) are new versions of UMTS using E-UTRA, which adopt OFDMA on the downlink and SC-FDMA on the uplink. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). Cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The technology described herein can be used for wireless networks and radio technologies. In addition, the technology given herein can be used in various other non-wireless communication networks (such as optical fiber networks, hard-line "copper" networks, etc.) or in digital storage or compression. In other words, the technology given herein can be used in any system including an encoder.

[0029] Figure 1 An example wireless network 100 is shown, such as a New Radio (NR) or 5G network, in which aspects of the present disclosure may be performed, for example, to reduce the search space for maximum likelihood (ML) decoding of polar codes. In some cases, network 100 may be a fiber optic network, a hard-wired "copper" network, or the like.

[0030] like Figure 1 As shown in , the wireless network 100 may include multiple BSs 110 and other network entities. A BS may be a station that communicates with a UE. Each BS 110 may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a Node B and / or a Node B subsystem serving the coverage area, depending on the context in which the term is used. In the NR system, the terms "cell" and eNB, Node B, 5G NB, AP, NR BS, NR BS, BS or TRP may be interchangeable. In some examples, a cell may not necessarily be stationary, and the geographic area of ​​a cell may move according to the location of a mobile base station. In some examples, base stations may be interconnected to each other and / or to one or more other base stations or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (e.g., direct physical connections, virtual networks, or interfaces using any appropriate transport networks).

[0031] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks with different RATs. In some cases, NR or 5G RAT networks using a multi-slice network architecture can be deployed.

[0032] A BS may provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in a residence, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in FIG. 1 , BSs 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. A BS may support one or more (e.g., three) cells.

[0033] The wireless network 100 may also include a relay station. A relay station is a station that receives data transmissions and / or other information from an upstream station (e.g., a BS or a UE) and sends data transmissions and / or other information to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that relays transmissions for other UEs. Figure 1 In the example shown in , a relay station 110r may communicate with a BS 110a and a UE 120r to facilitate communication between the BS 110a and the UE 120r. A relay station may also be referred to as a relay BS, a relay, or the like.

[0034] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, repeaters, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 20 watts), while a pico BS, a femto BS, and a repeater may have a lower transmit power level (e.g., 1 watt).

[0035] Wireless network 100 may support synchronous operation or asynchronous operation. For synchronous operation, BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time. For asynchronous operation, BSs may have different frame timing, and transmissions from different BSs may not be aligned in time. The techniques described herein may be used for both synchronous and asynchronous operation.

[0036] A network controller 130 may couple to a set of BSs and provide coordination and control for these BSs. The network controller 130 may communicate with the BSs 110 via a backhaul. The BSs 110 may also communicate with each other, directly or indirectly, for example, via a wireless or wired backhaul.

[0037] UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a customer premises equipment (CPE), a cellular phone, a smart phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or medical apparatus, a biometric sensor / device, a wearable device (such as a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet, etc.)), an entertainment device (e.g., a music device, a video device, a satellite radio unit, etc.), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium. Some UEs may be considered as evolved or machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a BS, another device (e.g., a remote device), or some other entity. A wireless node may provide, for example, a connection to a network (e.g., a wide area network such as the Internet or a cellular network) or to a network via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices.

[0038] exist Figure 1 In FIG. 1 , a solid line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE on a downlink and / or uplink. A dashed line with double arrows indicates interfering transmissions between a UE and a BS.

[0039] Some wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, frequency bins, etc. Each subcarrier can be modulated with data. Typically, modulation symbols are sent in the frequency domain using OFDM and in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the spacing of the subcarriers can be 15kHz and the minimum resource allocation (referred to as a "resource block") can be 12 subcarriers (or 180kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), the nominal FFT size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth can also be divided into subbands. For example, a subband may cover 1.08 MHz (ie, 6 resource blocks), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, respectively.

[0040] Although aspects of the examples described herein may be associated with LTE technology, aspects of the present disclosure may be applied with other wireless communication systems, such as NR / 5G.

[0041] NR can utilize OFDM with CP on both the uplink and downlink, and can include support for half-duplex operation using TDD. A single component carrier bandwidth of 100 MHz can be supported. NR resource blocks can span 12 subcarriers with a subcarrier bandwidth of 75 kHz in 0.1 ms duration. Each radio frame has a length of 10 ms and can consist of two subframes, each half-frame includes five subframes, each subframe has a length of 1 ms. Each subframe can indicate the link direction (i.e., DL or UL) used for data transmission, and the link direction for each subframe can be switched dynamically. Each subframe can include DL / UL data and DL / UL control data. The UL and DL subframes for NR can be as follows about Figure 6 and Figure 7Described in more detail. Beamforming can be supported and the beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. The MIMO configuration in the DL can support up to 8 transmit antennas, with multi-layer DL transmission of up to 8 streams and up to 2 streams per UE. Multi-layer transmission with up to 2 streams per UE can be supported. Aggregation of multiple cells with up to 8 serving cells can be supported. Alternatively, NR can support different air interfaces other than OFDM-based air interfaces. The NR network may include entities such as CU and / or DU.

[0042] In some examples, access to the air interface may be scheduled, wherein a scheduling entity (e.g., a base station) allocates resources for communication between some or all devices and apparatuses within its service area or cell. Within the present disclosure, as further discussed below, a scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, subordinate entities utilize resources allocated by the scheduling entity. The base station is not the only entity that can be used as a scheduling entity. That is, in some examples, a UE may be used as a scheduling entity that schedules resources for one or more subordinate entities (e.g., one or more other UEs). In this example, a UE is being used as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication. A UE may be used as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In a mesh network example, in addition to communicating with a scheduling entity, UEs may also optionally communicate directly with each other.

[0043] Thus, in a wireless communication network having scheduled access to time-frequency resources and having a cellular configuration, a P2P configuration, and a mesh configuration, a scheduling entity and one or more slave entities may communicate using the scheduled resources.

[0044] As mentioned above, the RAN may include a CU and a DU. A NR BS (e.g., a gNB, a 5G Node B, a Node B, a transmit receive point (TPR), an access point (AP)) may correspond to one or more BSs. An NR cell may be configured as an access cell (ACell) or a data-only cell (DCell). For example, a RAN (e.g., a central unit or a distributed unit) may configure the cell. A DCell may be a cell for carrier aggregation or dual connectivity, but not for initial access, cell selection / reselection, or switching. In some cases, a DCell may not send a synchronization signal—in some cases, a DCell may send an SS. The NRBS may send a downlink signal to the UE to indicate the cell type. Based on the cell type indication, the UE may communicate with the NR BS. For example, the UE may determine, based on the indicated cell type, the NR BS to be considered for cell selection, access, switching, and / or measurement.

[0045] Figure 2 It shows that it can be Figure 1 200 . An example logical architecture of a distributed radio access network (RAN) 200 implemented in a wireless communication system shown in . A 5G access node 206 may include an access node controller (ANC) 202. The ANC may be a central unit (CU) of the distributed RAN 200. The backhaul interface to the next generation core network (NG-CN) 204 may terminate at the ANC. The backhaul interface to the adjacent next generation access node (NG-AN) may terminate at the ANC. The ANC may include one or more TRPs 208 (which may also be referred to as BS, NR BS, Node B, 5G NB, AP, or some other terminology). As described above, TRP may be used interchangeably with "cell".

[0046] The TRP 208 may be a DU. The TRP may be connected to one ANC (ANC 202) or more than one ANC (not shown). For example, for RAN sharing, Radio as a Service (RaaS), and service-specific AND deployments, the TRP may be connected to more than one ANC. The TRP may include one or more antenna ports. The TRP may be configured to provide services to the UE individually (e.g., dynamically selected) or jointly (e.g., joint transmission).

[0047] The local architecture 200 can be used to illustrate the fronthaul definition. The architecture can be defined to support fronthaul solutions across different deployment types. For example, the architecture can be based on the sending network capabilities (e.g., bandwidth, latency, and / or jitter).

[0048] The architecture may share features and / or components with LTE. According to aspects, a next generation AN (NG-AN) 210 may support dual connectivity with NR. The NG-AN may share a common fronthaul for LTE and NR.

[0049] The architecture may enable collaboration between and among TRPs 208. For example, collaboration may be pre-set within and / or across TRPs via ANC 202. According to aspects, no inter-TRP interface may be required / existent.

[0050] According to aspects, there may be a dynamic configuration of split logic functions in the architecture 200. As will be seen in reference to Figure 5 In more detail, the radio resource control (RRC) layer, the packet data convergence protocol (PDCP) layer, the radio link control (RLC) layer, the medium access control (MAC) layer, and the physical (PHY) layer can be adaptively placed at the DU or CU (e.g., TRP or ANC, respectively). According to certain aspects, the BS can include a central unit (CU) (e.g., ANC 202) and / or one or more distributed units (e.g., one or more TRPs 208).

[0051] Figure 3 An example physical architecture of a distributed RAN 300 is shown in accordance with aspects of the present disclosure. A centralized core network unit (C-CU) 302 may host core network functions. The C-CU may be centrally deployed. C-CU functions may be offloaded (e.g., to Advanced Wireless Services (AWS)) to handle peak capacity.

[0052] A centralized RAN unit (C-RU) 304 may host one or more ANC functions. Optionally, the C-RU may host core network functions locally. The C-RU may have a distributed deployment. The C-RU may be closer to the network edge.

[0053] The DU 306 may host one or more TRPs (edge ​​node (EN), edge unit (EU), radio head (RH), smart radio head (SRH), etc.) The DU may be located at the edge of the network with radio frequency (RF) capabilities.

[0054] Figure 4 Shown in Figure 11 and 120, which may be used to implement aspects of the present disclosure. As described above, the BS may include a TRP. One or more components in the BS 110 and the UE 120 may be used to implement aspects of the present disclosure. For example, the antenna 452, Tx / Rx 222, processors 466, 458, 464, and / or controller / processor 480 of the UE 120, and / or the antenna 434, processors 460, 420, 438, and / or controller / processor 440 of the BS 110 may be used to perform the operations described herein and with reference to the present disclosure. Fig. 9 A- Fig. 9 B and Fig.11 A- Fig.11 B shows the operation.

[0055] According to various aspects, for a restricted association scenario, base station 110 may be Figure 1 1. The macro BS 110c in FIG. 1 may be a macro BS 110c, and the UE 120 may be a UE 120y. The base station 110 may also be some other type of base station. The base station 110 may be equipped with antennas 434a to 434t, and the UE 120 may be equipped with antennas 452a to 452r.

[0056] At the base station 110, the transmit processor 420 may receive data from the data source 412 and control information from the controller / processor 440. The control information may be used for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), etc. The data may be used for a physical downlink shared channel (PDSCH), etc. The processor 420 may process (e.g., encode and symbol map) the data and control information respectively to obtain data symbols and control symbols. The processor 420 may also generate reference symbols, such as for PSS, SSS, and cell-specific reference signals. The transmit (TX) multiple-input multiple-output (MIMO) processor 430 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols (if applicable), and may provide output symbol streams to modulators (MOD) 432a to 432t. Each modulator 432 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 432 may further process (eg, convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 432a through 432t may be transmitted via antennas 434a through 434t, respectively.

[0057] At the UE 120, antennas 452a to 452r can receive downlink signals from the base station 110 and can provide received signals to demodulators (DEMOD) 454a to 454r, respectively. Each demodulator 454 can adjust (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator 454 can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 456 can obtain received symbols from all demodulators 454a to 454r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. The receive processor 458 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to the data sink 460, and provide decoded control information to the controller / processor 480.

[0058] On the uplink, at the UE 120, a transmit processor 464 may receive and process data from a data source 462 (e.g., for a physical uplink shared channel (PUSCH)) and control information from a controller / processor 480 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 464 may also generate reference symbols for reference signals. The symbols from the transmit processor 464 may be precoded by a TX MIMO processor 466 (if applicable), further processed by demodulators 454a through 454r (e.g., for SC-FDM, etc.), and transmitted to the base station 110. At the BS 110, the uplink signals from the UE 120 may be received by the antenna 434, processed by the modulator 432, detected by the MIMO detector 436 (if applicable), and further processed by the receive processor 438 to obtain decoded data and control information transmitted by the UE 120. The receive processor 438 may provide decoded data to a data sink 439 and decoded control information to a controller / processor 440 .

[0059] Controllers / processors 440 and 480 may direct the operation at base station 110 and UE 120, respectively. Processor 440 and / or other processors and modules at base station 110 may perform or direct, for example, Figure 6 The processor 480 and / or other processors and modules at the UE 120 may also execute or direct, for example, Figure 7 1 and / or for the execution of other processes for the techniques described herein. Memories 442 and 482 may store data and program codes for BS 110 and UE 120, respectively. Scheduler 444 may schedule UEs for data transmission on the downlink and / or uplink.

[0060] Figure 5 A diagram 500 is shown depicting an example of implementing a communication protocol stack according to various aspects of the present disclosure. The communication protocol stack shown can be implemented by a device operating in a 5G system (e.g., a system supporting uplink-based mobility). Diagram 500 shows a communication protocol stack, which includes a radio resource control (RRC) layer 510, a packet data convergence protocol (PDCP) layer 515, a radio link control (RLC) layer 520, a medium access control (MAC) layer 525, and a physical (PHY) layer 530. In various examples, these layers of the protocol stack can be implemented as separate software modules, parts of a processor or ASIC, parts of non-co-located devices connected by a communication link, or various combinations thereof. Co-located and non-co-located implementations can be used, for example, in a protocol stack for a network access device (e.g., AN, CU, and / or DU) or a UE.

[0061] The first option 505-a shows a split implementation of the protocol stack, where the centralized network access device (e.g., Figure 2 ANC 202 in ) and distributed network access equipment (e.g., Figure 2 In the first option 505-a, the RRC layer 510 and the PDCP layer 515 can be implemented by the central unit, while the RLC layer 520, the MAC layer 525 and the physical layer 530 can be implemented by the DU. In various examples, the CU and the DU can be co-located or non-co-located. In macro cell, micro cell or pico cell deployment, the first option 505-a can be useful.

[0062] The second option 505-b shows a unified implementation of the protocol stack, where the protocol stack is implemented in a single network access device (e.g., access node (AN), new radio base station (NR BS), new radio node B (NR NB), network node (NN), etc.). In the second option, the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the physical layer 530 can all be implemented by the AN. In a femtocell deployment, the second option 505-b may be useful.

[0063] Regardless of whether the network access device implements part or all of the protocol stack, the UE may implement the entire protocol stack (eg, the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the physical layer 530).

[0064] Figure 6 Various components that may be utilized in a wireless communication device 602 are shown, wherein the Figure 1A wireless communication device 602 is employed within a wireless communication system of . The wireless communication device 602 is an example of a device that can be configured to implement various methods described herein (e.g., for reducing the search space for ML decoding of polar codes). The wireless communication device 602 can be from Figure 1 BS 110 or any user equipment 120.

[0065] The wireless communication device 602 may include a processor 604 that controls the operation of the wireless communication device 602. The processor 604 may also be referred to as a central processing unit (CPU). A memory 606, which may include both a read-only memory (ROM) and a random access memory (RAM), provides instructions and data to the processor 604. A portion of the memory 606 may also include a non-volatile random access memory (NVRAM). The processor 604 typically performs logical and arithmetic operations based on program instructions stored in the memory 606. The instructions in the memory 606 may be executable to implement the methods described herein.

[0066] The wireless communication device 602 may also include a housing 608, which may include a transmitter 610 and a receiver 612 to allow transmission and reception of data between the wireless communication device 602 and a remote node. The transmitter 610 and the receiver 612 may be combined into a transceiver 614. A single or multiple transmit antennas 616 may be attached to the housing 608 and electrically coupled to the transceiver 614. The wireless communication device 602 may also include (not shown) multiple transmitters, multiple receivers, and multiple transceivers.

[0067] The wireless communication device 602 may also include a signal detector 618 that may be used to detect and quantify the level of the signal received by the receiver 614. The signal detector 618 may detect signals such as total energy, energy per symbol per subcarrier, power spectral density, and other signals. The wireless communication device 602 may also include a digital signal processor (DSP) 620 for processing signals.

[0068] In addition, the wireless communication device 602 may further include an encoder 622, which is used to encode a signal for transmission. For example, in some cases, the encoder 622 may be configured to allocate / assign the first one or more bits to the position of the information stream, wherein the first one or more bits indicate at least one of the bit values ​​of one or more second bits in the information stream or the size of the information stream.

[0069] In addition, the wireless communication device 602 may include a decoder 624 for decoding a received signal encoded using the techniques presented herein. For example, in some cases, the decoder 624 may be configured to: decode a first portion of a codeword, wherein the first portion of the codeword corresponds to a position in an information stream to which a first one or more bits are assigned, wherein the first one or more bits indicate at least one of a bit value of one or more second bits in the information stream or a size of the information stream; determine a bit value of one or more second bits based at least in part on the first one or more bits; and decode the remaining portion of the codeword based on the determined bit value of the one or more second bits.

[0070] The various components of the wireless communication device 602 can be coupled together via a bus system 626, which can include a power bus, a control signal bus, and a status signal bus in addition to a data bus. According to various aspects of the present disclosure discussed below, the processor 604 can be configured to access instructions stored in the memory 606 to perform connectionless access.

[0071] Figure 7 700 is a diagram illustrating an example of a DL-centric subframe that may be used by one or more devices (e.g., BS 110 and / or UE 120) to communicate in wireless network 100. The DL-centric subframe may include a control portion 702. The control portion 702 may be present at an initial or beginning portion of the DL-centric subframe. The control portion 702 may include various scheduling information and / or control information corresponding to various portions of the DL-centric subframe. In some configurations, the control portion 702 may be a physical DL control channel (PDCCH), such as Figure 7 . The DL-centric subframe may also include a DL data portion 704. The DL data portion 704 may sometimes be referred to as a payload of the DL-centric subframe. The DL data portion 704 may include communication resources for transmitting DL data from a scheduling entity (e.g., a UE or a BS) to a subordinate entity (e.g., a UE). In some configurations, the DL data portion 704 may be a physical DL shared channel (PDSCH).

[0072] The DL-centric subframe may also include a common UL portion 706. The common UL portion 706 may sometimes be referred to as a UL burst, a common UL burst, and / or various other appropriate terms. The common UL portion 706 may include feedback information corresponding to various other portions of the DL-centric subframe. For example, the common UL portion 706 may include feedback information corresponding to the control portion 702. Non-limiting examples of the feedback information may include an ACK signal, a NACK signal, a HARQ indicator, and / or various other appropriate types of information. The common UL portion 706 may include additional or alternative information, such as information related to a random access channel (RACH) process, a scheduling request (SR), and various other appropriate types of information. Figure 7 As shown in , the end of the DL data portion 704 can be separated in time from the beginning of the common UL portion 706. This time separation may sometimes be referred to as a gap, a guard period, a guard interval, and / or various other appropriate terms. This separation provides time for switching from DL communications (e.g., reception operations performed by a slave entity (e.g., a UE)) to UL communications (e.g., transmissions performed by a slave entity (e.g., a UE)). It will be appreciated by those skilled in the art that the foregoing is merely an example of a DL-centric subframe, and that alternative structures with similar features may exist without necessarily departing from the aspects described herein.

[0073] Figure 8 800 is a diagram illustrating an example of a UL-centric subframe that may be used by one or more devices (e.g., BS 110 and / or UE 120) to communicate in wireless network 100. The UL-centric subframe may include a control portion 802. The control portion 802 may be present at an initial or beginning portion of the UL-centric subframe. Figure 8 The control portion 802 in the embodiment may be similar to the above reference Figure 7 The control portion described above. The UL-centric subframe may also include a UL data portion 804. The UL data portion 804 may sometimes be referred to as a payload of the UL-centric subframe. The UL portion may refer to communication resources used to transmit UL data from a subordinate entity (e.g., a UE) to a scheduling entity (e.g., a UE or a BS). In some configurations, the control portion 802 may be a physical DL control channel (PDCCH).

[0074] like Figure 8As shown in , the end of the control portion 802 can be separated in time from the beginning of the UL data portion 804. This time separation may sometimes be referred to as a gap, a guard period, a guard interval, and / or various other appropriate terms. This separation provides time for switching from DL communication (e.g., a receive operation performed by a scheduling entity) to UL communication (e.g., a transmit operation performed by a scheduling entity). The UL-centric subframe may also include a common UL portion 806. Figure 8 The common UL portion 806 in the example may be similar to that described above with reference to Figure 8 The common UL portion 806 described herein may additionally or alternatively include information related to a channel quality indicator (CQI), a sounding reference signal (SRS), and various other suitable types of information. It will be appreciated by those skilled in the art that the foregoing is merely an example of a UL-centric subframe, and that alternative structures with similar features may exist without necessarily departing from the various aspects described herein.

[0075] In some cases, two or more slave entities (e.g., UEs) can communicate with each other using side-link signals. Real-life applications of such side-link communications may include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh networks, and / or various other appropriate applications. Typically, a side-link signal may refer to a signal transmitted from one slave entity (e.g., UE1) to another slave entity (e.g., UE2) without the need for relaying the communication through a scheduling entity (e.g., UE or BS), even though the scheduling entity may be used for scheduling and / or control purposes. In some examples, licensed spectrum may be used to transmit side-link signals (unlike wireless local area networks that typically use unlicensed spectrum).

[0076] The UE may operate in various radio resource configurations, including configurations associated with sending pilots using a dedicated set of resources (e.g., a radio resource control (RRC) dedicated state, etc.), or configurations associated with sending pilots using a common set of resources (e.g., an RRC common state, etc.). When operating in the RRC dedicated state, the UE may select a dedicated set of resources for sending pilot signals to the network. When operating in the RRC common state, the UE may select a common set of resources for sending pilot signals to the network. In either case, the pilot signal sent by the UE may be received by one or more network access devices (such as an AN or DU or a portion thereof). Each receiving network access device may be configured to receive and measure pilot signals sent on a common set of resources, and also receive and measure pilot signals sent on a dedicated set of resources allocated to the UE (for which the network access device is a member of a set of network access devices that monitor the UE). The CU that receives one or more of the network access devices, or receives the measurement to which the network access device sends the pilot signal, may use the measurement to identify a serving cell for the UE, or initiate a change to a serving cell for one or more of the UEs.

[0077] In 5G New Radio (NR), aperiodic channel state information (CSI) reporting is triggered by a CSI report trigger sent from a base station to a user equipment. The CSI report trigger indicates to the UE the timing and allocated resources for performing CSI reporting. In some cases, when the UE sends a CSI report via a physical uplink shared channel (PUSCH), the CSI report trigger may be sent via an uplink (UL) grant containing resource allocation (RA) information, where the UE knows which resource is used to perform CSI reporting based on the RA information. According to various aspects, the CSI report may include a CSI reference signal channel indicator (CRI), a rank indicator (RI), a channel quality information (CQI), and a precoding matrix indicator (PMI). PMI may be further classified as a wideband PMI (WB PMI) or a subband PMI (SB PMI). For a type II linear combination codebook, the WB PMI includes a rotation indication, a beam indication, a wideband amplitude indication, and a strongest beam indication; the SB PMI includes a subband amplitude indicator and a subband phase indicator.

[0078] In some cases, the payload sizes of CRI, RI, and CQI are fixed, while the PMI (especially subband PMI) payload size may vary depending on the reported RI. In this regard, the CSI report may be divided into two or three parts, where the first part of the CSI feedback contains CRI / RI / CQI whose payload is fixed, and the second and third parts of the CSI feedback contain PMI whose payload size depends on the first part (and where the third part may also depend on the second part). Table 1 below shows different scenarios when the CSI feedback may be divided into two or three parts and the information carried in each part.

[0079]

[0080] Table 1

[0081] Example Single-Block Coded CSI Design for NR-MIMO

[0082] As described above, the size of the information payload bits available for CSI reporting can vary. Unfortunately, this variability can present challenges. For example, the variability increases the number of blind decodes required for payloads of different sizes due to the increased number of possible decoding candidates. In addition, adapting to payloads of different sizes can lead to other challenges when deciding on packet sizes or encoding methods.

[0083] In some cases, CSI can be sent on a short PUCCH. For example, PUCCH can be used for wideband and partial band reporting (e.g., one CSI for all subbands in the CSI reporting band). In some cases, in order to limit blind decoding, the same packet size can be used regardless of the RI / CRI in a given time slot. However, depending on the maximum number of CSI-RS ports of the CSI-RS resources configured within the CSI-RS resource set, the size of the information payload may be different. This may also affect the coding technique. For example, when the PMI and CQI payload sizes vary with RI / CRI, padding bits can be added to one or more of the RI / CRI / PMI / CQI fields before (during or after) encoding to balance the payload lengths associated with different RI / CRI values. In some cases, the bits for RI / CRI / PMI / CQI can be jointly encoded together with the padding bits when necessary.

[0084] However, aspects of the present disclosure provide solutions that may help address the challenges presented by varying information payload sizes for different sets of CSI-RS resources, for example, by determining the payload size and encoding method according to the CSI reporting configuration.

[0085] Fig. 9 Example operations 900 for wireless communication are shown. According to certain aspects of the present disclosure, operations 900 may be performed, for example, by a UE for channel state information reporting. For example, similar operations may be performed on the base station (e.g., gNB) side to determine the packet size and encoding for processing CSI reports from the UE.

[0086] Operations 900 begin at 902 by determining a payload size for a channel state information (CSI) report based at least in part on supported ranks. At 904, the UE calculates a packet length for the CSI report based on the determined payload size. At 906, the UE encodes CSI for a selected CSI resource index (CRI) based on the payload size and the calculated packet length to generate a coded packet.

[0087] In some cases, K CRI hypotheses may be considered (eg, such that the CRI index value m will be 1<=m<=K). m For each CRI (index m), the maximum supported rank R can be determined as follows m (According to step 902):

[0088] min(UE_rank_capability, port_rank_capability)

[0089] Where m is the CRI index, P m It may be (N1, N2) antenna ports. UE_rank_capability may be a predefined value that may be provided via higher layer signaling, and port_rank_capability is a value that depends on the port configuration (eg, for Type I CSI feedback, port_rank_capability=2xN1xN2).

[0090] In some cases, the maximum payload size J for a CRI with index m m Can be determined as:

[0091]

[0092] in and CQI R They are used for rank R and port configuration P respectively m The total PMI bits including both wideband and subband (i1 and i2 parts) PMI and CQI bits for rank R. It should be noted that if the number of ports used for CSI-RS resources in the same resource set is the same, then J mIt may be the same for all CRIs (in which case the index subscript m may be dropped).

[0093] In some cases, it can be used for a given R m of Provided as a table. For example, Fig.10 An example payload size table for Type I CSI for NR-MIMO is shown, which includes PMI and CQI for a given (N1, N2) and "mode" configuration. In the example shown, it can be noted that the CQI for <= 4 layers is assumed to be 4 bits, while the CQI for > 4 layers is assumed to be 7 bits.

[0094] Given the information payload size, the packet length J can be calculated, for example, as:

[0095] in

[0096] Given an information payload size and packet length, padding bits can be used to encode the packet if necessary. For example, for a selected CRI m, rank R:

[0097] if

[0098] but Padding bits can be used to equalize packet length.

[0099] In some cases, you can omit The CRI field, while for R m =1, can be omitted The rank field of the

[0100] In some cases, there may be constraints on the RI field, which may affect the determination of the packet length and / or the encoding for the selected CRI m. In such a case, the payload size of the RI field may first be determined as:

[0101]

[0102] The maximum payload can be determined as above, while the packet length J can be determined based on the payload size J of the RI field. R :

[0103]

[0104] Given the packet length and RI field payload size, the packet can be encoded as described above (with padding if necessary). For example, for a selected CRI m, rank R:

[0105] if but

[0106] Padding bits can be used to equalize the RI bit field

[0107] if but

[0108] Padding bits can be used to equalize packet length

[0109] In some cases, the packet may be encoded using joint coding with padding bits. For example, if CRI / RI is jointly coded, the jointly coded CRI / RI bits may be concatenated with the PMI / CQI bits by adding padding bits for packet length equalization. The jointly coded CRI / RI field may have:

[0110] Bits

[0111] The PMI / CQI field may have:

[0112] J′=max m＝1～K (J m ) bits

[0113] For a selected CRI m, rank R,

[0114] if but

[0115] Padding bits can be used to equalize packet length

[0116] For example, depending on the type of CSI report, certain portions of the CSI may be omitted. As an example, for partial PMI and semi-open-loop CSI reporting, the CSI report may contain a PMI consisting only of the i1 portion of the CRI / RI using a type I single-panel codebook (i1 typically identifies a combination of variables {i1,1 and i1,2} or {i1,1, i1,2 and i1,3}). For the above techniques for payload size determination and encoding, in some cases, the CQI portion may be ignored (omitted) and the i2 portion of the PMI may also be ignored.

[0117] In some cases, the CSI report may contain a PMI consisting of only i1 using a type I single panel codebook, CQI, and CRI / RI, where the CQI is calculated assuming a PDSCH transmission with Np≥1 precoders, where the UE may assume that a precoder is randomly selected from a set of Np precoders for each precoding resource block group (PRG) on the PDSCH. The PRG size in the CSI feedback may be RRC configured. The set of Np precoders used for CQI calculation may be indicated by a codebook subset restriction. In such a case, if the wideband CSI report is configured for reporting on long / short PUCCH, the i2 part of the PMI may be ignored for the above solution for payload size determination and encoding. If subband CSI feedback is configured and the maximum supported rank is within 4, single packet transmission may be ignored based on UE capabilities and port configuration, and the above solution may be applied, where the i2 part of the PMI may be ignored.

[0118] In some cases, the coding order of the CSI bits may be based on some mapping to the information bits. Fig.11 As shown, for joint coding of partial CSI with variable length, the CSI bits may be arranged into coding packets in ascending bit order. For example, at least for polar coding, the source bits of the CSI may be mapped to selected information bit positions in the u domain in ascending order.

[0119] It should be noted that the above techniques can be equally applied to CSI reporting on both long or short physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH). In addition, the above techniques can also be equally applied to any of aperiodic, semi-persistent or periodic CSI reporting.

[0120] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. For example, "at least one of a, b, or c" is intended to cover any combination of a, b, c, ab, ac, bc, and abc, as well as multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc or any other ordering of a, b, and c).

[0121] As used herein, the term "determining" includes a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, and the like. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. Furthermore, "determining" may include resolving, selecting, choosing, establishing, and the like.

[0122] In some cases, a device may have an interface for outputting frames for transmission, rather than actually sending frames. For example, a processor may output frames to an RF front end for transmission via a bus interface. Similarly, a device may have an interface for obtaining frames received from another device, rather than actually receiving frames. For example, a processor may obtain (or receive) frames from an RF front end via a bus interface for transmission.

[0123] The various operations of the methods described above may be performed by any suitable unit capable of performing the corresponding functions. These units may include various hardware and / or software components and / or modules, including but not limited to: circuits, application specific integrated circuits (ASICs) or processors. Typically, where there are operations shown in the figures, those operations may have corresponding paired units plus functional components with similar numbers.

[0124] For example, a unit for sending, a unit for receiving, a unit for determining, a unit for executing and / or a unit for retransmitting may include one or more processors or antennas at BS 110 or UE 120, such as a transmit processor 420, a controller / processor 440, a receive processor 438 or an antenna 434 at BS 110 and / or a transmit processor 464, a controller / processor 480, a receive processor 458 or an antenna 452 at UE 120.

[0125] The various illustrative logic blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or performed using a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0126] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. Depending on the specific application and overall design constraints of the processing system, the bus may include any number of interconnecting buses and bridges. The bus may connect various circuits including a processor, a machine-readable medium, and a bus interface together. In addition, the bus interface may also be used to connect a network adapter to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the user equipment 120 (see Figure 1 ), a user interface (e.g., a keypad, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also connect various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and therefore will not be described further. The processor may be implemented using one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how to best implement the functionality described for the processing system depending on the specific application and the overall design constraints imposed on the entire system.

[0127] If implemented with software, the functions may be stored on or transmitted through a computer-readable medium as one or more instructions or codes. Whether referred to as software, firmware, middleware, microcode, hardware description language or other terms, software should be broadly interpreted as meaning instructions, data or any combination thereof. Computer-readable media include both computer storage media and communication media, and communication media include any media that helps to transfer a computer program from one place to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. A computer-readable storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative, the storage medium may be a component of the processor. For example, a machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions stored thereon that is separated from a wireless node, all of which may be accessed by a processor through a bus interface. Alternatively or in addition, a machine-readable medium or any part thereof may be integrated into a processor, for example, the case may be a cache and / or a general register stack. For example, examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. Machine-readable media may be embodied in a computer program product.

[0128] A software module may include a single instruction or many instructions, and may be distributed over several different code segments, distributed among different programs, and distributed across multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a sending module and a receiving module. Each software module may be located in a single storage device or distributed across multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard drive into a RAM. During the execution of a software module, a processor may load some of the instructions into a cache to increase access speed. Subsequently, one or more cache lines may be loaded into a general register stack for execution by a processor. It will be understood that when the function of a software module is mentioned below, this function is implemented by a processor when executing instructions from the software module.

[0129] Additionally, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (e.g., infrared (IR), radio and microwave), then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (e.g., infrared, radio and microwave) are included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Optical disks, where magnetic disks typically reproduce data magnetically, and optical disks reproduce data optically with lasers. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Additionally, for other aspects, computer-readable media may include non-transitory computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0130] In addition, it should be understood that the modules and / or other appropriate units for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station where applicable. For example, such a device can be coupled to a server to facilitate the transmission of units for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage unit (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or a floppy disk, etc.) so that the user terminal and / or base station can obtain the various methods when the storage unit is coupled to or provided to the device. In addition, any other appropriate technology for providing the methods and techniques described herein to a device can be used.

[0131] It is to be understood that the claims are not limited to the precise configuration and components shown above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication, comprising: determining, for one or more channel state information (CSI) resource indexes (CRIs), a payload size for a CSI report based at least in part on a rank supported by each CRI, and determining a payload size for a rank indicator (RI) field based on a maximum rank among the ranks supported by each CRI; calculating a packet length for the CSI report based on the determined payload size for the CSI report and the payload size for the RI field; as well as The CSI for the selected CRI is encoded based on the payload size and the calculated packet length to generate an encoded packet, wherein the encoding includes padding the RI field with bits to ensure that the packet length for the RI field is the same and further padding the CSI with bits to ensure that the packet length for the CSI report is the same regardless of the selected CRI, and wherein the encoding includes mapping the CSI bits in the encoded packet to information bit positions in ascending order, at least for polarity codes.

2. The method according to claim 1, wherein: The payload size for the CSI report is based on a maximum number of CSI bits for the selected CRI.

3. The method according to claim 2, wherein: The maximum number of CSI bits is determined as the sum of Precoding Matrix Indicator (PMI) bits for the i1 and i2 parts of the PMI and the sum of Channel Quality Indicator (CQI) bits.

4. The method according to claim 3, wherein: For partial PMI and semi-open-loop CSI reporting, the PMI bits of the i2 part of the PMI are omitted.

5. The method according to claim 2, wherein: The maximum number of CSI bits for the selected CRI is obtained from a lookup table.

6. The method according to claim 1, wherein: The encoding includes omitting the CRI field if only one CRI is considered.

7. An apparatus for wireless communication, comprising: means for determining, for one or more channel state information (CSI) resource indexes (CRIs), a payload size for a CSI report based at least in part on a rank supported by each CRI and determining a payload size for a rank indicator (RI) field based on a maximum rank among the ranks supported by each CRI; means for calculating a packet length for the CSI report based on the determined payload size for the CSI report and the payload size for the RI field; as well as Unit for encoding the CSI for a selected CRI based on the payload size and the calculated packet length to generate an encoded packet, wherein the encoding includes padding the RI field with bits to ensure that the packet length for the RI field is the same and further padding the CSI with bits to ensure that the packet length for the CSI report is the same regardless of the selected CRI, and wherein the encoding includes mapping the CSI bits in the encoded packet to information bit positions in ascending order, at least for polar codes.

8. The device according to claim 7, wherein: The payload size for the CSI report is based on a maximum number of CSI bits for the selected CRI.

9. The device according to claim 8, wherein: The maximum number of CSI bits is determined as the sum of Precoding Matrix Indicator (PMI) bits for the i1 and i2 parts of the PMI and the sum of Channel Quality Indicator (CQI) bits.

10. The device according to claim 9, wherein: For partial PMI and semi-open-loop CSI reporting, the PMI bits of the i2 part of the PMI are omitted.

11. The device according to claim 8, wherein: The maximum number of CSI bits for the selected CRI is obtained from a lookup table.

12. The device according to claim 7, wherein: The means for encoding comprises means for omitting a CRI field if only one CRI is considered.

13. An apparatus for wireless communication, comprising: At least one processor configured to: determine, for one or more channel state information (CSI) resource indexes (CRIs), a payload size for a CSI report based at least in part on a rank supported by each CRI, and determine a payload size for a rank indicator (RI) field based on a maximum rank among the ranks supported by each CRI; calculate a packet length for the CSI report based on the determined payload size for the CSI report and the payload size for the RI field; and encoding the CSI for the selected CRI based on the payload size and the calculated packet length to generate an encoded packet, wherein the encoding includes padding the RI field with bits to ensure that the packet length for the RI field is the same and further padding the CSI with bits to ensure that the packet length for the CSI report is the same regardless of the selected CRI, and wherein the encoding includes mapping the CSI bits in the encoded packet to information bit positions in ascending order at least for polar codes; A transmitter is configured to transmit the encoded packet.

14. The device according to claim 13, wherein: The payload size for the CSI report is based on a maximum number of CSI bits for the selected CRI.

15. The device according to claim 14, wherein: The maximum number of CSI bits is determined as the sum of Precoding Matrix Indicator (PMI) bits for the i1 and i2 parts of the PMI and the sum of Channel Quality Indicator (CQI) bits.

16. The device according to claim 15, wherein: For partial PMI and semi-open-loop CSI reporting, the PMI bits of the i2 part of the PMI are omitted.

17. The device according to claim 14, wherein: The maximum number of CSI bits for the selected CRI is obtained from a lookup table.

18. The device according to claim 13, wherein: The encoding includes omitting the CRI field if only one CRI is considered.

19. A computer readable medium having stored thereon instructions for: determining, for one or more channel state information (CSI) resource indexes (CRIs), a payload size for a CSI report based at least in part on a rank supported by each CRI, and determining a payload size for a rank indicator (RI) field based on a maximum rank among the ranks supported by each CRI; calculating a packet length for the CSI report based on the determined payload size for the CSI report and the payload size for the RI field; and encoding the CSI for the selected CRI based on the payload size and the calculated packet length to generate an encoded packet, wherein: The encoding includes padding bits to the RI field to ensure that the packet length for the RI field is the same and further padding bits to the CSI to ensure that the packet length for the CSI report is the same regardless of the selected CRI, and wherein the encoding includes mapping the CSI bits in the encoded packet to information bit positions in ascending order, at least for polarity codes.

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