CN109075950B

CN109075950B - Phase compensated reference signal for 5G systems

Info

Publication number: CN109075950B
Application number: CN201780028043.2A
Authority: CN
Inventors: S·文; 熊岗; J-K·方
Original assignee: Apple Inc
Current assignee: Apple Inc
Priority date: 2016-05-09
Filing date: 2017-05-09
Publication date: 2022-02-22
Anticipated expiration: 2037-05-09
Also published as: WO2017196896A1; CN109075950A

Abstract

Described is an apparatus of an evolved node b (enb) operable to communicate with User Equipment (UE) over a wireless network. The apparatus may include a first circuit and a second circuit. The first circuit is operable to: a subframe configuration including one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols is established for one of Uplink (UL) transmission or Downlink (DL) transmission. The second circuit is operable to: at least a portion of the one or more OFDM symbols are allocated one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) at one or more subcarrier frequencies to carry PCRS signals.

Description

Phase compensated reference signal for 5G systems

Priority requirement

This application claims priority from U.S. provisional patent application serial No. 62/333,698 entitled "Phase Compensation Reference Signal In The 5G Systems" filed 2016, 5, 9, And from U.S. patent application serial No. 62/336,383 entitled "UL Phase Compensation Reference Signal In The 5G Systems" filed 2016, 5, 13, 2016, from 35u.s.c. 119(e), And from U.S. patent application serial No. 62/344,101 entitled "Dual Phase Compensation Reference Signal In The 5G Systems" filed 2016, 6, 1, 6, 2016, which are hereby incorporated herein by Reference In their entirety.

Background

Various wireless cellular communication systems have been implemented, including third generation partnership project (3GPP) universal mobile telecommunications systems, 3GPP Long Term Evolution (LTE) systems, and 3GPP LTE-advanced (LTE-a) systems. Next generation wireless cellular communication systems (e.g., fifth generation (5G) wireless systems/5G mobile network systems) based on LTE and LTE-a are being developed. Next generation wireless cellular communication systems may provide support for higher bandwidths, in part, by supporting higher carrier frequencies (e.g., centimeter-wave and millimeter-wave frequencies).

Drawings

Embodiments of the present disclosure will be understood more fully from the detailed description given below and from the accompanying drawings of various embodiments of the disclosure. However, while the drawings are intended to aid in explanation and understanding, they are merely intended to aid in this disclosure and should not be construed as limiting the disclosure to the particular embodiments depicted herein.

Fig. 1 illustrates an example subframe configuration according to some embodiments of the present disclosure.

Fig. 2 illustrates an example pattern of Downlink (DL) Phase Compensated Reference Signal (PCRS) transmission over a four Physical Resource Block (PRB) allocation in accordance with some embodiments of the present disclosure.

Fig. 3 illustrates an example pattern of DL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure.

Fig. 4 illustrates an example pattern of PCRS transmission and demodulation reference signal (DMRS) transmission over a four PRB allocation in accordance with some embodiments of the present disclosure.

Fig. 5 illustrates an example pattern of DL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure.

Fig. 6 illustrates an example pattern of Uplink (UL) PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure.

Fig. 7 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure.

Fig. 8 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure.

Fig. 9 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure.

Fig. 10 illustrates an example pattern of DL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure.

Fig. 11 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure.

Fig. 12 illustrates example patterns of PCRS and DMRS transmissions on a four PRB allocation, according to some embodiments of the disclosure.

Fig. 13A-13B illustrate example patterns of PCRS and DMRS transmissions on two four PRB allocations, according to some embodiments of the present disclosure.

Fig. 14 illustrates an example pattern of UL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure.

Fig. 15 illustrates an example pattern of UL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure.

Fig. 16 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure.

Fig. 17 illustrates an example pattern of DL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure.

Fig. 18 illustrates an example pattern of UL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure.

Fig. 19 illustrates an example pattern of UL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure.

Fig. 20 illustrates an example pattern of DL DMRS transmission on a four PRB allocation, according to some embodiments of the present disclosure.

Fig. 21 illustrates an evolved node b (enb) and a User Equipment (UE) according to some embodiments of the present disclosure.

Fig. 22 illustrates hardware processing circuitry of an eNB for PCRS according to some embodiments of the present disclosure.

Fig. 23 illustrates hardware processing circuitry for PCRS of a UE according to some embodiments of the present disclosure.

Fig. 24-26 illustrate methods for PCRS by an eNB, according to some embodiments of the present disclosure.

Fig. 27-29 illustrate methods for PCRS for a UE according to some embodiments of the present disclosure.

Fig. 30 illustrates example components of a UE device according to some embodiments of the present disclosure.

Detailed Description

Various wireless cellular communication systems have been implemented or are being proposed, including 3 rd generation partnership project (3GPP) Universal Mobile Telecommunications System (UMTS), 3GPP Long Term Evolution (LTE) system, 3GPP LTE advanced (LTE-a) system, and 5 th generation wireless system/5 th generation mobile network (5G) system/5 th generation new air interface (NR) system.

Some proposed cellular communication systems may include radio frequencies that include one or more frequency bands between 30 gigahertz (GHz) and 300 GHz. These communication systems may sometimes be referred to as millimeter wave (mmWave) systems, corresponding to radio wavelengths from 10 millimeters (mm) to 1 mm.

The 5G system may accordingly operate at mmWave frequencies, which may in turn support data rates of 30 gigahertz per second (Gbps). Compared to the legacy LTE communication system, the 5G system can operate in a frequency band that can be ten times higher. A 5G system may be arranged to employ larger subcarrier spacing in an Orthogonal Frequency Division Multiplexing (OFDM) arrangement to avoid frequency domain offsets.

The phase noise may be a kind of frequency offset (or offset in the frequency domain) generated in the oscillator by a Voltage Controlled Oscillator (VCO) circuit, a Phase Locked Loop (PLL) circuit, or both. In a communication system configured to have various subcarrier frequencies, phase noise may cause inter-carrier interference. Advantageously, phase noise can be compensated.

Disclosed herein are various mechanisms and methods for implementing a reference signal that compensates for effects due to phase noise (e.g., inter-carrier interference). These reference signals may be referred to as phase noise compensated reference signals (PCRS).

In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present disclosure. However, it will be understood by those skilled in the art that the disclosed embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring embodiments of the present disclosure.

Note that in the corresponding drawings of the embodiments, signals are represented by straight lines. Some straight lines may be thicker to indicate a greater number of constituent signal paths and/or have arrows at one or more ends to indicate the direction of information flow. These indications are not intended to be limiting. Furthermore, straight lines are used in connection with one or more exemplary embodiments to facilitate easier understanding of a circuit or logic unit. Any represented signal specified by design requirements or preferences may include one or more signals that may travel in virtually any direction and may be implemented with any suitable type of signal scheme.

Throughout the specification, and in the claims, the term "connected" means a direct electrical, mechanical, or magnetic connection between the things that are connected, without any intermediate device. The term "coupled" means a direct electrical, mechanical, or magnetic connection between the various items connected, or an indirect connection through one or more passive or active intermediary devices. The term "circuit" or "module" may refer to one or more passive or active components arranged to cooperate with each other to provide a desired function. The term "signal" may refer to at least one current signal, voltage signal, magnetic signal, or data/clock signal. The meaning of "a", "an" and "the" includes plural references. The meaning of "in … …" includes "in … …" and "on … …".

The terms "substantially", "close", "approximately", "close" and "approximately" generally refer to being within +/-10% of a target value. Unless otherwise specified, the use of the ordinal adjectives "first", "second", and "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in other orientations than those illustrated or otherwise described herein.

The terms "left," "right," "front," "back," "over," "under," and the like in the description and in the claims, if any, are used for descriptive purposes and not necessarily for describing permanent relative positions.

For purposes of the embodiments, the transistors in the various circuits, modules and logic blocks are tunnel fets (tfets). Some transistors of various embodiments may include Metal Oxide Semiconductor (MOS) transistors that include drain, source, gate, and bulk terminals. Transistors may also include tri-Gate and FinFET transistors, Cylindrical All Around cylinder (Gate All Around cylinder) transistors, Square Wire (Square Wire) or Rectangular Ribbon (Rectangular Ribbon) transistors, or other devices that perform the function of a transistor (e.g., carbon nanotube or electron spin devices). The symmetrical source and drain terminals of the MOSFET are the same terminal and are used interchangeably herein. TFET devices, on the other hand, have asymmetric source and drain terminals. Those skilled in the art will appreciate that other transistors (e.g., bipolar junction transistors-BJTs PNP/NPN, BiCMOS, CMOS, etc.) may be used for some of the transistors without departing from the scope of the present disclosure.

For the purposes of this disclosure, the phrases "a and/or B" and "a or B" mean (a), (B), or (a and B). For the purposes of this disclosure, the phrase "A, B and/or C" means (a), (B), (C), (a and B), (a and C), (B and C), or (A, B and C).

Furthermore, the various elements of combinational AND sequential logic discussed in this disclosure may all belong to a physical structure (e.g., an AND gate, an OR gate, OR an XOR gate), OR to a set of synthesized OR optimized devices that implement a logical structure equivalent to the boolean algebra of the logic in question.

Further, for purposes of this disclosure, the term "eNB" may refer to an evolved node b (eNB) with legacy LTE capabilities, a next generation or 5G capable eNB, a mmWave small cell, an Access Point (AP), and/or another base station for a wireless communication system. For purposes of this disclosure, the term "UE" may refer to a legacy LTE UE, a next generation or 5G capable UE, a mmWave UE, a Station (STA), and/or another mobile device for a wireless communication system.

Various embodiments of the eNB and/or UE discussed below may process one or more transmissions of various types. Some processing of the transmission may include demodulating, decoding, detecting, parsing, and/or handling the transmission that has been received. In some embodiments, an eNB or UE processing a transmission may determine or identify a type and/or condition of the transmission associated with the transmission. For some embodiments, the eNB or UE handling the transmission may act according to the type of transmission and/or may act conditionally based on the type of transmission. The eNB or UE handling the transmission may also identify one or more values or fields of the data carried by the transmission. Processing the transmission may include: the transmission is moved through one or more layers of the protocol stack (which may be implemented in, for example, hardware and/or software configured elements), for example, by moving the transmission that the eNB or UE has received through one or more layers of the protocol stack.

Various embodiments of the eNB and/or UE discussed below may also generate one or more transmissions of various types. Some generation of the transmission includes: the transmission to be sent is modulated, encoded, formatted, assembled, and/or handled. In some embodiments, the eNB or UE generating the transmission may establish the type and/or conditions of the transmission associated with the transmission. For some embodiments, the eNB or UE generating the transmission may act according to the type of transmission and/or may act conditionally based on the type of transmission. The eNB or UE generating the transmission may also determine one or more values or fields of the data carried by the transmission. Generating the transmission may include: the transmission is moved through one or more layers of the protocol stack (which may be implemented in, for example, hardware and/or software configured elements), for example, by moving the transmission to be sent by the eNB or UE through one or more layers of the protocol stack.

The phase noise may be compensated, which may be frequency domain compensation or time domain compensation (or both). Under some time domain methods, a known signal (which may be a PCRS signal) may be transmitted in multiple symbols on the transmit side of a wireless communication link. On the receive side of the wireless communication link, the phase difference between the symbols may be determined and the phase difference may be corrected to compensate for phase noise. The PCRS may advantageously improve the performance of systems with data encoded at high modulation and/or high coding rates.

Fig. 1 illustrates an example subframe configuration according to some embodiments of the present disclosure. Scenario 100 may include one or more subframe configurations 110, each of which may span multiple symbols 120. As depicted, scenario 100 includes nine subframe configurations (enumerated in 0 through 8), each of which spans fourteen symbols (spanning symbol indices 0 through 13). Subframe configurations 0 to 8 may be used in 5G and/or mmWave systems and may support PCRS.

A subframe may be configured to carry a Downlink (DL) control channel (e.g., "Dc" (e.g., 5G physical downlink control channel (xPDCCH))) in one or more initial symbols (e.g., symbol 0, or symbols 0 and 1). The DL control channel may indicate a subframe configuration in a first symbol of a subframe, and may thus determine the configuration of the remaining symbols of the subframe. In some embodiments, the DL control channel may configure subframes on a subframe-by-subframe basis.

In some embodiments, a subframe may be configured to carry a DL data channel (e.g., "Dd" (e.g., 5G physical downlink shared channel (xPDSCH))) in one or more symbols (e.g., starting from

symbol

1 or 2 and extending through symbol 11 or 13) after the one or more initial symbols. These subframe configurations may be DL subframe configurations and may provide DL data transmission.

For some embodiments, a subframe may be configured to carry a Gap Period (GP) in one or more symbols (e.g., symbol 1 and/or symbol 12) following the one or more initial symbols. The GP may provide time for the transceiver to transition from a transmit mode to a receive mode or may provide time for the transceiver to transition from a receive mode to a transmit mode. In some embodiments, a subframe may be configured to carry an Uplink (UL) data channel (e.g., "Ud" (e.g., 5G physical uplink shared channel (xPDSCH))) in one or more symbols (e.g., starting with symbol 2 and extending through

symbols

11, 13, or 13) after an initial symbol and/or gap period. These subframe configurations may be UL subframe configurations and may provide UL data transmissions.

In some embodiments, a subframe may be configured to carry an UL control channel (e.g., "Uc" (e.g., a 5G Physical Uplink Control Channel (PUCCH))) in one or more symbols (e.g., in symbol 13). For some embodiments, a subframe may be configured to carry channel state information reference signals (CSI-RS) in one or more symbols (e.g., in symbols 12 and/or 13). In some embodiments, a subframe may be configured to carry a Sounding Reference Signal (SRS) in one or more symbols (e.g., in symbols 12 and/or 13).

The subframe configurations 0 to 3 may be DL subframe configurations, and may carry a DL control channel in symbol 0 and a DL data channel in symbols 2 to 11. Subframe configuration 0 may additionally carry a DL data channel in symbol 1 and either a DL data channel or CSI-RS in

symbols

12 and 13. Subframe configuration 1 may additionally carry a DL data channel in symbol 1, a GP in symbol 12, and either a UL control channel or SRS in symbol 13. Subframe configuration 2 may additionally carry a DL control channel in symbol 1 and either a DL data channel or CSI-RS in

symbols

12 and 13. Subframe configuration 3 may additionally carry a DL control channel in symbol 1, a GP in symbol 12, and either a UL control channel or an SRS in symbol 13.

The subframe configurations 4 to 8 may be UL subframe configurations, and may carry a DL control channel in symbol 0, a GP in symbol 1, and a UL data channel in symbols 2 to 11. Subframe configuration 4 may additionally carry UL data channels in

symbols

12 and 13. The subframe configuration 5 may additionally carry a UL data channel in symbol 12 and either a UL control channel or SRS in symbol 13. The subframe configuration 6 may additionally carry the UL data channel in symbol 12 and the CSI-RS in symbol 13. The subframe configuration 7 may additionally carry SRS in symbol 12 and CSI-RS in symbol 13. The subframe configuration 8 may additionally carry SRS in symbol 12 and UL control channel in symbol 13.

In various subframe configurations, the PCRS may be located in symbols carrying data (e.g., xPDSCH and/or xPUSCH). Some embodiments may exploit the commonality of the PCRS pattern in the DL and UL. Some embodiments may employ symmetry in the frequency domain.

For various subframe configurations, the PCRS may have a pattern within a resource allocation that includes four Physical Resource Blocks (PRBs). Each four PRB allocation may include 48 allocated subcarrier frequencies. In some embodiments, a four PRB allocation may

Fig. 2 illustrates an example pattern of Downlink (DL) Phase Compensated Reference Signal (PCRS) transmission over a four Physical Resource Block (PRB) allocation in accordance with some embodiments of the present disclosure. The pattern 200 may include four PRBs 201 spanning a four PRB allocation 204. The pattern 200 may include a first PCRS sequence 210 carrying PCRS and a second PCRS sequence 220 carrying PCRS.

The PRB 201 may be substantially similar to a legacy LTE PRB and may span 14 OFDM symbols and 12 subcarrier frequencies, respectively, and the four PRB allocation 204 may span 14 OFDM symbols and 48 subcarrier frequencies, respectively. The four PRB allocation 204 may include Resource Elements (REs) spanning 14 OFDM symbols and 48 subcarrier frequencies. In some embodiments, PRB 201 may span other numbers of OFDM symbols and/or other numbers of subcarrier frequencies. The pattern 200 may repeat in frequency (e.g., every four PRBs over the system bandwidth).

The first and

second PCRS sequences

210 and 220 may span OFDM symbols 3 through 13. In some embodiments, the first PCRS sequence 210 and/or the second PCRS sequence 220 may span other OFDM symbols.

For some embodiments, the OFDM symbols that a PCRS sequence may span may relate to symbols carrying data in a corresponding subframe configuration. For example, the first and

second PCRS sequences

210 and 220 may correspond to configuration 0 and/or configuration 2 in the subframe configuration 110. For some embodiments, the initial symbol (e.g., symbol 3) may be an initial symbol for data transmission, typically for both DL and UL transmissions. In some embodiments, the selection of the PCRS and the options used for data or PCRS may be configured through Radio Resource Control (RRC) signaling or may be configured through Downlink Control Information (DCI) configuration.

Each port may be allocated to xPDSCH transmissions and may be associated with a different Transmission Point (TP). In some embodiments, one eNB may implement multiple TPs. In some embodiments, pattern 200 may be applied to DL transmissions (although in some embodiments, pattern 200 may be applied to UL transmissions). In pattern 200, transmission of data may begin at

symbol

1 or 2 and end at

symbol

11 or 13. In some embodiments, for one TP, one symbol allocated for the PCRS may be used for data transmission.

The first PCRS sequence 210 may be carried at a first subcarrier frequency within the four PRB allocation 204 and may correspond to a first antenna port. A second PCRS sequence 220 may be carried at a second subcarrier frequency within the four PRB allocation 204 and may correspond to a second antenna port.

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 204. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within the four PRB allocation 204 and the second subcarrier frequency may be subcarrier frequency 31 within the four PRB allocation 204. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port may be antenna port 61 and the second antenna port may be antenna port 60. In various embodiments, the first antenna port and/or the second antenna port may be other antenna ports.

Fig. 3 illustrates an example pattern of DL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure. The pattern 300 may include four PRBs 301 spanning a four PRB allocation 304. The pattern 300 may include a first PCRS sequence 310 carrying a PCRS and a second PCRS sequence 320 carrying a PCRS. The first PCRS sequence 310 may be carried at a first subcarrier frequency within the four PRB allocation 304 and may correspond to a first antenna port. A second PCRS sequence 320 may be carried at a second subcarrier frequency within the four PRB allocation 304 and may correspond to a second antenna port. In various embodiments, pattern 300 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 300 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first and second subcarrier frequencies may be substantially distributed around the center of the 48 subcarrier frequencies of the four PRB allocation 304, which may advantageously address potentially high inter-carrier interference (ICI) that may exist at the center of the four PRB allocation 304. In some embodiments, the first subcarrier frequency may be subcarrier frequency 23 within the four PRB allocation 304 and the second subcarrier frequency may be subcarrier frequency 24 within the four PRB allocation 304. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

Fig. 4 illustrates an example pattern of PCRS transmission and demodulation reference signal (DMRS) transmission over a four PRB allocation in accordance with some embodiments of the present disclosure. The pattern 400 may include four PRBs 401 spanning a four PRB allocation 404. Pattern 400 may include a first PCRS sequence 410 carrying a PCRS and a second PCRS sequence 420 carrying a PCRS. The first PCRS sequence 410 may be carried at a first subcarrier frequency within the four PRB allocation 404 and may correspond to a first antenna port. A second PCRS sequence 420 may be carried at a second subcarrier frequency within the four PRB allocation 404 and may correspond to a second antenna port. In various embodiments, pattern 400 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 400 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

The pattern 400 may further include a DMRS sequence 490 spanning 48 subcarrier frequencies in OFDM symbol 2. In some embodiments, the DMRS sequence 490 in subcarrier frequency 0 may correspond to one of antenna port 10 or antenna port 20 or antenna port 40. For some embodiments, the DMRS sequence 490 in subcarrier frequency 1 may correspond to one of antenna port 21 or antenna port 41. In some embodiments, DMRS sequence 490 in subcarrier frequency 2 may correspond to antenna port 42. For some embodiments, the DMRS sequence 490 in subcarrier frequency 3 may correspond to antenna port 43. The correspondence between antenna ports and DMRS sequences 490 in subcarrier frequencies 0 to 3 may be repeated every 4 subcarrier frequencies. In various embodiments, the DMRS sequences 490 in subcarrier frequencies 0 to 47 may correspond to various antenna ports.

In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within the four PRB allocation 404 and the second subcarrier frequency may be subcarrier frequency 31 within the four PRB allocation 404. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

For some embodiments, the first antenna port may be one of antenna port 10 or antenna port 20 or antenna port 40, and the second antenna port may be antenna port 43. In various embodiments, the first antenna port and/or the second antenna port may be antenna ports other than

antenna ports

10, 20, or 40 and antenna port 43. For example, the first antenna port or the second antenna port may be one of the antenna port 21 or the antenna port 41, or may be the antenna port 42. In various embodiments, the first antenna port and/or the second antenna port may be other antenna ports.

For the various embodiments, the first PCRS sequence 410 may correspond to the same antenna port as the DMRS sequence 490 at the first subcarrier frequency, and the second PCRS sequence 420 may correspond to the same antenna port as the DMRS sequence 490 at the second subcarrier frequency. In some embodiments, the first and

second PCRS sequences

410 and 420 may reuse one or more DMRS signals used at those subcarrier frequencies. One or more PCRS signals may be generated accordingly by being linked to one or more respectively corresponding DMRS signals at the same subcarrier frequency.

For DL transmission, the first PCRS sequence 410 may correspond to a PCRS for a first TP, and the second PCRS sequence 420 may correspond to a PCRS for a second TP. For UL transmission, the first PCRS sequence 410 may correspond to a PCRS for a first UE, and the second PCRS sequence 420 may correspond to a PCRS for a second UE.

Fig. 5 illustrates an example pattern of DL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure. The pattern 500 may include four PRBs 501 spanning a four PRB allocation 504. Pattern 500 may include a first PCRS sequence 510 carrying a PCRS and a second PCRS sequence 520 carrying a PCRS. The first PCRS sequence 510 may be carried at a first subcarrier frequency within the four PRB allocation 504 and may correspond to a first antenna port. A second PCRS sequence 520 may be carried at a second subcarrier frequency within the four PRB allocation 504 and may correspond to a second antenna port. In various embodiments, pattern 500 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 500 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 504. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within the four PRB allocation 504 and the second subcarrier frequency may be subcarrier frequency 32 within the four PRB allocation 504. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

The first and second subcarrier frequencies may be located respectively in the same DMRS antenna port location (e.g., at subcarrier frequencies having indices separated by 16 or by another multiple of 4). For example, in some embodiments, the first subcarrier frequency may be located at subcarrier frequency 15 and second subcarrier frequency 31. In another example, the first subcarrier frequency may be located at subcarrier frequency 17 and the second subcarrier frequency may be located at subcarrier frequency 33. For some such embodiments, the PCRS signal may equivalently start from symbol index 2 (rather than from symbol index 3).

In pattern 200, pattern 300, pattern 400, and/or pattern 500, the initial symbol of the PCRS may be symbol 1 (e.g., configuration 2 or configuration 3 for subframe configuration 110). For UL transmissions, separate users (e.g., separate UEs) may have one or more separate PCRS REs to track frequency offset in separate oscillators. Additional PCRS REs (e.g., additional PCRS sequences) may support four UL multi-user multiple-input multiple-output (MU-MIMO). For example, the additional REs may be positioned in a substantially evenly distributed manner.

Fig. 6 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure. The pattern 600 may include four PRBs 601 spanning a four PRB allocation 604. Pattern 600 may include a first PCRS sequence 610 carrying PCRS, a second PCRS sequence 620 carrying PCRS, a third PCRS sequence 630 carrying PCRS, and a fourth PCRS sequence 640 carrying PCRS. The first PCRS sequence 610 may be carried at a first subcarrier frequency within the four PRB allocation 604 and may correspond to a first antenna port. A second PCRS sequence 620 may be carried at a second subcarrier frequency within the four PRB allocation 604 and may correspond to a second antenna port. A third PCRS sequence 630 may be carried at a third subcarrier frequency within the four PRB allocation 604 and may correspond to a third antenna port. A fourth PCRS sequence 640 may be carried at a fourth subcarrier frequency within the four PRB allocation 604 and may correspond to a fourth antenna port. In various embodiments, pattern 600 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 600 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly spaced between subcarrier frequency 0, the center subcarrier frequency (e.g., subcarrier frequency 23), and themselves in the four PRB allocation 604. For various embodiments, the third subcarrier frequency and the fourth subcarrier frequency may be substantially evenly spaced between the center subcarrier frequency (e.g., subcarrier frequency 24), subcarrier frequency 47, and themselves. The first subcarrier frequency, the second subcarrier frequency, the third subcarrier frequency, and the fourth subcarrier frequency may be spaced in a substantially evenly distributed manner in the four PRB allocation 604.

In some embodiments, the first subcarrier frequency may be subcarrier frequency 7, the second subcarrier frequency may be subcarrier frequency 16, the third subcarrier frequency may be subcarrier frequency 31, and the fourth subcarrier frequency may be subcarrier frequency 40. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port may be antenna port 53, the second antenna port may be antenna port 51, the third antenna port may be antenna port 50, and the fourth antenna port may be antenna port 52. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be antenna ports other than antenna port 51, antenna port 50, antenna port 52, and antenna port 53. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be other antenna ports.

Fig. 7 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure. The pattern 700 may include four PRBs 701 spanning a four PRB allocation 704. Pattern 700 may include a first PCRS sequence 710 carrying PCRS, a second PCRS sequence 720 carrying PCRS, a third PCRS sequence 730 carrying PCRS, and a fourth PCRS sequence 740 carrying PCRS. The first PCRS sequence 710 may be carried at a first subcarrier frequency within the four PRB allocation 704 and may correspond to a first antenna port. A second PCRS sequence 720 may be carried at a second subcarrier frequency within the four PRB allocation 704 and may correspond to a second antenna port. The third PCRS sequence 730 may be carried at a third subcarrier frequency within the four PRB allocation 704 and may correspond to a third antenna port. A fourth PCRS sequence 740 may be carried at a fourth subcarrier frequency within the four PRB allocation 704 and may correspond to a fourth antenna port. In various embodiments, pattern 700 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 700 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly spaced between subcarrier frequency 0, a center subcarrier frequency (e.g., subcarrier frequency 23), and themselves in the four PRB allocation 704. For various embodiments, the third subcarrier frequency and the fourth subcarrier frequency may be substantially evenly spaced between the center subcarrier frequency (e.g., subcarrier frequency 24), subcarrier frequency 47, and themselves. The first subcarrier frequency, the second subcarrier frequency, the third subcarrier frequency, and the fourth subcarrier frequency may be spaced in a substantially evenly distributed manner in the four PRB allocation 704.

In some embodiments, the first subcarrier frequency may be subcarrier frequency 8, the second subcarrier frequency may be subcarrier frequency 16, the third subcarrier frequency may be subcarrier frequency 31, and the fourth subcarrier frequency may be subcarrier frequency 39. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port may be antenna port 53, the second antenna port may be antenna port 51, the third antenna port may be antenna port 50, and the fourth antenna port may be antenna port 52. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be other antenna ports.

Fig. 8 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure. The pattern 800 may include four PRBs 801 spanning a four PRB allocation 804. The pattern 800 may include a first PCRS sequence 810 carrying PCRS, a second PCRS sequence 820 carrying PCRS, a third PCRS sequence 830 carrying PCRS, and a fourth PCRS sequence 840 carrying PCRS. The first PCRS sequence 810 may be carried at a first subcarrier frequency within the four PRB allocation 804 and may correspond to a first antenna port. A second PCRS sequence 820 may be carried at a second subcarrier frequency within the four PRB allocation 804 and may correspond to a second antenna port. A third PCRS sequence 830 may be carried at a third subcarrier frequency within the four PRB allocation 804 and may correspond to a third antenna port. A fourth PCRS sequence 840 may be carried at a fourth subcarrier frequency within the four PRB allocation 804 and may correspond to a fourth antenna port. In various embodiments, pattern 800 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 800 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly spaced between subcarrier frequency 0, a center subcarrier frequency (e.g., subcarrier frequency 23), and themselves in the four PRB allocation 804. For various embodiments, the third subcarrier frequency and the fourth subcarrier frequency may be substantially evenly spaced between the center subcarrier frequency (e.g., subcarrier frequency 24), subcarrier frequency 47, and themselves. The first subcarrier frequency, the second subcarrier frequency, the third subcarrier frequency, and the fourth subcarrier frequency may be spaced in a substantially evenly distributed manner in the four PRB allocation 804.

In some embodiments, the first subcarrier frequency may be subcarrier frequency 8, the second subcarrier frequency may be subcarrier frequency 16, the third subcarrier frequency may be subcarrier frequency 32, and the fourth subcarrier frequency may be subcarrier frequency 40. (accordingly, in various embodiments, the first subcarrier frequency may be

subcarrier frequency

7 or 8, the second subcarrier frequency may be

subcarrier frequency

15 or 16, the third subcarrier frequency may be

subcarrier frequency

31 or 32, and the fourth subcarrier frequency may be subcarrier frequency 39 or 40). For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

Fig. 9 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure. Pattern 900 may include four PRBs 901 spanning a four PRB allocation 904. The pattern 900 may include a first PCRS sequence 910 carrying a PCRS, a second PCRS sequence 920 carrying a PCRS, a third PCRS sequence 930 carrying a PCRS, and a fourth PCRS sequence 940 carrying a PCRS. A first PCRS sequence 910 may be carried at a first subcarrier frequency within the four PRB allocation 904 and may correspond to a first antenna port. A second PCRS sequence 920 may be carried at a second subcarrier frequency within the four PRB allocation 904 and may correspond to a second antenna port. A third PCRS sequence 930 may be carried at a third subcarrier frequency within the four PRB allocation 904 and may correspond to a third antenna port. A fourth PCRS sequence 940 may be carried at a fourth subcarrier frequency within the four PRB allocation 904 and may correspond to a fourth antenna port. In various embodiments, pattern 900 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 900 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequencies may be substantially evenly distributed between subcarrier frequency 0 and a center subcarrier frequency (e.g., subcarrier frequency 23) of the four PRB allocation 904; the second subcarrier frequency and the third subcarrier frequency may be substantially evenly distributed around a center of the 48 subcarrier frequencies of the four PRB allocation 904; and the fourth subcarrier frequencies may be substantially evenly distributed between a center subcarrier frequency of four PRB allocation 904 (e.g., subcarrier frequency 24) and subcarrier frequency 47. In some embodiments, the first subcarrier frequency may be subcarrier frequency 11, the second subcarrier frequency may be subcarrier frequency 23, the third subcarrier frequency may be subcarrier frequency 24, and the fourth subcarrier frequency may be subcarrier frequency 36. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

As discussed herein, the DL transmission may carry a PCRS (which may include a phase noise compensation reference signal). Fig. 10 illustrates an example pattern of DL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure. The pattern 1000 may include four PRBs 1001 spanning a four PRB allocation 1004. Pattern 1000 may include a first PCRS sequence 1010 carrying a PCRS and a second PCRS sequence 1020 carrying a PCRS. The first PCRS sequence 1010 may be carried at a first subcarrier frequency within the four PRB allocation 1004 and may correspond to a first antenna port. A second PCRS sequence 1020 may be carried at a second subcarrier frequency within the four PRB allocation 1004 and may correspond to a second antenna port. In various embodiments, pattern 1000 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 1000 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 1004. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within four PRB allocation 1004 and the second subcarrier frequency may be subcarrier frequency 31 within four PRB allocation 1004. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In various embodiments, the DL PCRS may be associated with xPDSCH transmissions. In some embodiments, the DL PCRS may be transmitted on antenna port p-60 and antenna port p-61. For some embodiments, for example, if an xPDSCH transmission is associated with a corresponding antenna port, a DL PCRS may be present and may be an effective reference for phase noise compensation. In some embodiments, the DL PCRS may be transmitted on the PRBs and symbols (e.g., in the REs) to which the corresponding xPDSCH is mapped. For some embodiments, the DL PCRS may be the same in a number of symbols (up to and including all symbols) corresponding to the xPDSCH allocation.

For antenna port p e {60,61}, with frequency domain index n assigned for corresponding xDSCH transmission_PRB' in PRB, DMRS associated with xDSCH

Complex-valued modulation symbols that can be set to map to multiple xPDSCH symbols (up to and including all xPDSCH symbols) in a subframe according to the following formula

In the formula, p' may be a DMRS port number associated with xPDSCH transmission.

Starting resource block number for xDSCH physical resource allocation in frequency domain

Resource allocation bandwidth with respect to number of resource blocks

And the resource elements (k, l) in the subframe may be given by the following formula:

in the formula, k may be an index (e.g., subcarrier frequency or subcarrier frequency index) corresponding to a subcarrier position, l 'may be a symbol index within a subframe, and m' may be a PRB index.

For

subframe configurations

1 and 3 of subframe configuration 110, if CSI-RS exists in the last two symbols, PCRS may not be sent in those symbols.

The resource element (k, l) may be used for transmitting UE-specific PCRS on any antenna port in set S, where S ═ {60} and S ═ {61} may not be used for transmitting xPDSCH on any antenna port in the same subframe.

For some embodiments, the four PRB allocation 1004 may include REs for PCRS for antenna port 60 and antenna port 61 when xPDSCH is transmitted from l '3 to l' 13.

As discussed herein, the DL transmission may carry a PCRS (which may include a phase noise compensation reference signal). Fig. 11 illustrates an example pattern of UL PCRS transmission over a four PRB allocation in accordance with some embodiments of the present disclosure. The pattern 1100 may include four PRBs 1101 spanning a four PRB allocation 1104. Pattern 1100 may include a first PCRS sequence 1110 carrying PCRS and a second PCRS sequence 1120 carrying PCRS. The first PCRS sequence 1110 may be carried at a first subcarrier frequency within the four PRB allocation 1104 and may correspond to a first antenna port. A second PCRS sequence 1120 may be carried at a second subcarrier frequency within the four PRB allocation 1104 and may correspond to a second antenna port. In various embodiments, pattern 1100 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 1100 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 1104. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within the four PRB allocation 1104 and the second subcarrier frequency may be subcarrier frequency 31 within the four PRB allocation 1104. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port may be antenna port 51 and the second antenna port may be antenna port 50. In various embodiments, the first antenna port and/or the second antenna port may be other antenna ports.

In various embodiments, UL PCRS may be associated with xPUSCH transmission. In some embodiments, the UL PCRS may be transmitted on the antenna port assigned to the UE. For some embodiments, for example, if xPUSCH transmission is associated with a corresponding antenna port, UL PCRS may be present and may be an effective reference for phase noise compensation. In some embodiments, the UL PCRS may be transmitted on the PRB and symbol (e.g., in the RE) to which the corresponding xPUSCH is mapped. For some embodiments, the UL PCRS may be the same in multiple symbols (up to and including all symbols) corresponding to the xPUSCH allocation.

For antenna port p e {50,51}, with frequency domain index n assigned for the corresponding xUSCH transmission_PRB' PRB, DMRS associated with xUSCH

Complex valued modulation symbols that can be set to map to multiple xPUSCH symbols (up to and including all xPUSCH symbols) in a subframe according to the following formula

In the formula, p' may be a DMRS port number associated with xPUSCH transmission.

Starting resource block number for xUSCH physical resource allocation in frequency domain

Resource allocation bandwidth with respect to number of resource blocks

The resource element (k, l) may be used for transmitting the UE-specific PCRS on any antenna port in the set S, where S ═ {50} and S ═ {51} may not be used for transmitting xPUSCH on any antenna port in the same subframe.

For some embodiments, when xPUSCH is transmitted from l '3 to l' 13, the four PRB allocation 1104 may include REs for PCRS for antenna port 50 and antenna port 51.

In various embodiments, another way to support more than two MU-MIMO users may be to multiplex the PCRS REs in a Time Division Multiplexing (TDM) manner. Multiple users can be multiplexed in a TDM fashion accordingly. Fig. 12 illustrates example patterns of PCRS and DMRS transmissions on a four PRB allocation, according to some embodiments of the disclosure. Pattern 1200 may include four PRBs 1201 spanning a four PRB allocation 1204. The pattern 1200 may include a first PCRS sequence 1210 carrying PCRS and a second PCRS sequence 1220 carrying PCRS. A first PCRS sequence 1210 may be carried at a first subcarrier frequency within the four PRB allocation 1204 and may correspond to a first antenna port and a second antenna port multiplexed in a TDM manner. A second PCRS sequence 1220 may be carried at a second subcarrier frequency within the four PRB allocation 1204 and may correspond to a third antenna port and a fourth antenna port multiplexed in a TDM manner. In various embodiments, pattern 1200 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 1200 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

The pattern 1200 may further include a DMRS sequence 1290 spanning 48 subcarrier frequencies in OFDM symbol 2. In some embodiments, DMRS sequence 1290 in subcarrier frequency 0 may correspond to one of antenna port 10 or antenna port 20 or antenna port 40. For some embodiments, the DMRS sequence 1290 in subcarrier frequency 1 may correspond to one of antenna port 21 or antenna port 41. In some embodiments, DMRS sequence 1290 in subcarrier frequency 2 may correspond to antenna port 42. For some embodiments, DMRS sequence 1290 in subcarrier frequency 3 may correspond to antenna port 43. The correspondence between antenna ports and DMRS sequences 1290 in subcarrier frequencies 0 to 3 may be repeated every 4 subcarrier frequencies. In various embodiments, DMRS sequences 1290 in subcarrier frequencies 0 through 47 may correspond to various antenna ports.

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 1204. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within four PRB allocation 1204 and the second subcarrier frequency may be subcarrier frequency 31 within four PRB allocation 1204. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port of the first RE set 1211 in the odd OFDM symbols, which may correspond to the first PCRS sequence 1210, may be antenna port 44. The second antenna port, which may correspond to the second RE set 1212 in the even OFDM symbol of the first PCRS sequence 1210, may be antenna port 10 or antenna port 20 or antenna port 40. For some embodiments, the third antenna port of the third set of REs 1223 in the odd OFDM symbols, which may correspond to the second PCRS sequence 1220, may be antenna port 45. The fourth antenna port, which may correspond to the fourth RE set 1224 in the even OFDM symbols of the second PCRS sequence 1220, may be antenna port 43. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be other antenna ports.

Accordingly, the second RE set 1212 (of the first PCRS sequence 1210) may correspond to the same antenna port as the DMRS sequence 1290 at the first subcarrier frequency, and the fourth RE set 1224 (of the second PCRS sequence 1220) may correspond to the same antenna port as the DMRS sequence 1290 at the second subcarrier frequency. In some embodiments, the first PCRS sequence 1210 and the second PCRS sequence 1220 may reuse one or more DMRS signals at those subcarrier frequencies. One or more PCRS signals may be generated accordingly by being linked to one or more respectively corresponding DMRS signals at the same subcarrier frequency.

A potential problem with a PCRS implementation may be performance degradation of symbols without PCRS REs for UL MU-MIMO users. The user may be arranged to calculate the amount of phase rotation from one or more of the closest symbols. For example, user 1 may use

symbols

3, 5, 7, 9, 11, and 13 of the PCRS sequence (e.g., at subcarrier frequency 16 of the four PRB allocation). To estimate the phase rotation of symbol 4, phase rotation estimates at symbol 3 and/or symbol 5 may be used. This may result in performance degradation.

Thus, various embodiments may apply TDM symbol-wise periodicity on one or more allocated PRBs (e.g., of a four-PRB allocation). Fig. 13A-13B illustrate example patterns of PCRS and DMRS transmissions on two four PRB allocations, according to some embodiments of the present disclosure. Pattern 1300 may include a first four PRB allocation 1304 and a second four PRB allocation 1354. In some embodiments, the first and second four

PRB allocations

1304, 1354 may be adjacent to each other within the wireless spectrum, while in other embodiments, the first and second four

PRB allocations

1304, 1354 may be adjacent to each other within the wireless spectrum.

The first four PRB allocation 1304 may include four PRBs 1301 and may include a first PCRS sequence 1310 carrying PCRS and a second PCRS sequence 1320 carrying PCRS. A first PCRS sequence 1310 may be carried at a first subcarrier frequency within the first four PRB allocation 1304 and may correspond to a first antenna port and a second antenna port multiplexed in a TDM manner. A second PCRS sequence 1320 may be carried at a second subcarrier frequency within the first four PRB allocation 1304 and may correspond to a third antenna port and a fourth antenna port multiplexed in a TDM manner. In various embodiments, the first four PRB allocation 1304 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of the first four PRB allocation 1304 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

The second four PRB allocation 1354 may include four PRBs 1301 and may include a third PCRS sequence 1330 carrying PCRS and a fourth PCRS sequence 1340 carrying PCRS. The third PCRS sequence 1330 may be carried at a third subcarrier frequency within the second four PRB allocation 1354 and may correspond to a first antenna port and a second antenna port multiplexed in a TDM manner that is different from the first PCRS sequence 1310. A fourth PCRS sequence 1340 may be carried at a fourth subcarrier frequency within the second four PRB allocation 1354 and may correspond to a third antenna port and a fourth antenna port multiplexed in a TDM manner that is different from the second PCRS sequence 1320. In various embodiments, the second four PRB allocation 1354 may be substantially similar to the pattern 200 (and/or other patterns disclosed herein), and elements of the second four PRB allocation 1354 may be substantially similar to elements of the pattern 200 (and/or other patterns disclosed herein).

The pattern 1300 may further include a DMRS sequence 1390 spanning 48 subcarrier frequencies of the first four PRB allocation 1304 in OFDM symbol 2 and 48 subcarrier frequencies of the second four PRB allocation 1354 in OFDM symbol 2. In some embodiments, the DMRS sequence 1390 in subcarrier frequency 0 (of both the first four PRB allocation 1304 and the second four PRB allocation 1354) may correspond to one of antenna port 10 or antenna port 20 or antenna port 40. For some embodiments, the DMRS sequence 1390 in subcarrier frequency 1 (of both the first four PRB allocation 1304 and the second four PRB allocation 1354) may correspond to one of antenna port 21 or antenna port 41. In some embodiments, the DMRS sequence 1390 in subcarrier frequency 2 (of both the first four PRB allocation 1304 and the second four PRB allocation 1354) may correspond to antenna port 42. For some embodiments, the DMRS sequence 1390 in subcarrier frequency 3 (of both the first four PRB allocation 1304 and the second four PRB allocation 1354) may correspond to antenna port 43.

The correspondence between antenna ports and DMRS sequences 1390 in subcarrier frequencies 0 to 3 (in both the first and second four PRB allocations 1304, 1354) may repeat every 4 subcarrier frequencies. In various embodiments, DMRS sequences 1390 in subcarrier frequencies 0 to 47 (of both the first and second four PRB allocations 1304, 1354) may correspond to various antenna ports.

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the first four PRB allocation 1304. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within the first four PRB allocation 1304 and the second subcarrier frequency may be subcarrier frequency 31 within the first four PRB allocation 1304. For various embodiments, the third subcarrier frequency and the fourth subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the second four PRB allocation 1354. In some embodiments, the third subcarrier frequency may be subcarrier frequency 16 within second four PRB allocation 1354 and the fourth subcarrier frequency may be subcarrier frequency 31 within second four PRB allocation 1354. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In the first four PRB allocation 1304, in some embodiments, the first antenna port of the first RE set 1311 in odd OFDM symbols, which may correspond to the first PCRS sequence 1310, may be antenna port 44. For some embodiments, the second antenna port, which may correspond to the second set of REs 1312 in the even OFDM symbols of the first PCRS sequence 1310, may be antenna port 10 or antenna port 20 or antenna port 40. In some embodiments, the third antenna port of the third RE set 1323 in odd OFDM symbols, which may correspond to the second PCRS sequence 1320, may be antenna port 45. For some embodiments, the fourth antenna port of the fourth set of REs 1324 in the even OFDM symbols, which may correspond to the second PCRS sequence 1320, may be antenna port 43. For the second four PRB allocation 1354, in some embodiments, the first antenna port may also correspond to the sixth set of REs 1336 in even OFDM symbols of the third PCRS sequence 1330. For some embodiments, the second antenna port may also correspond to a fifth set of REs 1335 in odd OFDM symbols of the third PCRS sequence 1330. In some embodiments, the third antenna port may also correspond to the eighth set of REs 1348 in the even OFDM symbols of the fourth PCRS sequence 1340. For some embodiments, the fourth antenna port may also correspond to the seventh set of REs 1347 in the odd OFDM symbols of the fourth PCRS sequence 1340. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be other antenna ports.

Thus, the second set of REs 1312 (of the first PCRS sequence 1310) may correspond to the same antenna ports as the DMRS sequence 1390 at the first subcarrier frequency, the fourth set of REs 1324 (of the second PCRS sequence 1320) may correspond to the same antenna ports as the DMRS sequence 1390 at the second subcarrier frequency, the fifth set of REs 1335 (of the third PCRS sequence 1330) may correspond to the same antenna ports as the DMRS sequence 1390 at the third subcarrier frequency, and the seventh set of REs 1347 (of the fourth PCRS sequence 1340) may correspond to the same antenna ports as the DMRS sequence 1390 at the fourth subcarrier frequency. In some embodiments, the first, second, third, and

fourth PCRS sequences

1310, 1320, 1330, 1340 may reuse one or more DMRS signals at those subcarrier frequencies. One or more PCRS signals may be generated accordingly by being linked to one or more respectively corresponding DMRS signals at the same subcarrier frequency.

In some embodiments, in the first subcarrier frequency in the first four PRB allocation 1304, the first UE may use odd symbols (e.g.,

symbols

3, 5, 7, 9, 11, and/or 13) for PCRS and the second UE may use even symbols (e.g.,

symbols

4, 6, 8, 10, and/or 12) for PCRS. For some embodiments, in the second subcarrier frequency in the first four PRB allocation 1304, the third UE may use odd symbols for PCRS and the fourth UE may use even symbols for PCRS.

For some embodiments, in the third subcarrier frequency in the second four PRB allocation 1354, the first UE may use even symbols for PCRS and the second UE may use odd symbols for PCRS. In some embodiments, in a fourth subcarrier frequency in the second four PRB allocation 1354, a third UE may use even symbols for PCRS and a fourth UE may use odd symbols for PCRS.

Advantages of embodiments (e.g., the embodiments described in fig. 13A-13B) may be: there may be a PCRS RE for each UE in a given symbol position (which may cover the case where there are more than 8 allocated PRBs).

Fig. 14 illustrates an example pattern of UL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure. The pattern 1400 may include four PRBs 1401 spanning a four PRB allocation 1404. Pattern 1400 may conform to configuration 5 of subframe configuration 110.

The pattern 1400 may include a first PCRS sequence 1410 carrying PCRS and a second PCRS sequence 1420 carrying PCRS. A first PCRS sequence 1410 may be carried at a first subcarrier frequency within the four PRB allocation 1404 and may correspond to a first antenna port and a second antenna port multiplexed in a TDM manner. A second PCRS sequence 1420 may be carried at a second subcarrier frequency within the four PRB allocation 1404 and may correspond to a third antenna port and a fourth antenna port multiplexed in a TDM manner. In various embodiments, pattern 1400 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 1400 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 1404. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within the four PRB allocation 1404 and the second subcarrier frequency may be subcarrier frequency 31 within the four PRB allocation 1404. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port of the first RE set 1411 in odd OFDM symbols, which may correspond to the first PCRS sequence 1410, may be antenna port 50. A second antenna port of the second RE set 1412 in the even OFDM symbols, which may correspond to the first PCRS sequence 1410, may be antenna port 52. For some embodiments, the third antenna port, which may correspond to the third RE set 1423 in the odd OFDM symbol of the second PCRS sequence 1420, may be antenna port 51. A fourth antenna port, which may correspond to the fourth RE set 1424 in the even OFDM symbol of the second PCRS sequence 1420, may be antenna port 53. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be other antenna ports.

Fig. 15 illustrates an example pattern of UL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure. Pattern 1500 may include four PRBs 1501 spanning a four PRB allocation 1504. Pattern 1500 may conform to configuration 5 of subframe configuration 110.

The pattern 1500 may include a first PCRS sequence 1510 carrying a PCRS and a second PCRS sequence 1520 carrying a PCRS. The first PCRS sequence 1510 may be carried at a first subcarrier frequency within the four PRB allocation 1504 and may correspond to a first antenna port and a second antenna port multiplexed in a TDM manner. A second PCRS sequence 1520 may be carried at a second subcarrier frequency within the four PRB allocation 1504 and may correspond to a third antenna port and a fourth antenna port multiplexed in a TDM manner. In various embodiments, pattern 1500 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 1500 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 1504. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within four PRB allocation 1504 and the second subcarrier frequency may be subcarrier frequency 31 within four PRB allocation 1504. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port, which may correspond to the first RE set 1511 in the odd OFDM symbols of the first PCRS sequence 1510, may be antenna port 52. The second antenna port, which may correspond to the second RE set 1512 in the even OFDM symbols of the first PCRS sequence 1510, may be antenna port 50. For some embodiments, the third antenna port of the third RE set 1523 in the odd OFDM symbols, which may correspond to the second PCRS sequence 1520, may be antenna port 53. A fourth antenna port of the fourth RE set 1524 in the even OFDM symbols, which may correspond to the second PCRS sequence 1520, may be antenna port 51. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be other antenna ports.

With respect to fig. 14 and 15, in various embodiments, UL PCRS may be associated with xPUSCH transmission. In some embodiments, the UL PCRS may be sent on the antenna port assigned to the UE (e.g., antenna port p ∈ {50,51,52,53 }). For some embodiments, for example, if xPUSCH transmission is associated with a corresponding antenna port, UL PCRS may be present and may be an effective reference for phase noise compensation. In some embodiments, the UL PCRS may be transmitted on the PRB and symbol (e.g., in the RE) to which the corresponding xPUSCH is mapped.

For antenna port p ∈ {50,51,52,53}, the assignment for the corresponding xUSCH transmission is being madeWith a frequency domain index n_PRBIn PRB of (1), DMRS associated with xUSCH

Complex valued modulation symbols that can be set to map to one or more corresponding xPUSCH symbols (up to and including all xPUSCH symbols) in a subframe according to the following formula

Resource allocation bandwidth with respect to number of resource blocks

The resource element (k, l) may be used for transmitting UE-specific PCRS from one UE on antenna ports in set S, where S ═ {50}, S ═ {51}, S ═ {52} and S ═ {53} may not be used for transmitting xPUSCH on any antenna ports in the same subframe.

Fig. 16 illustrates an example pattern of UL PCRS transmission in a four PRB allocation row according to some embodiments of the present disclosure. Pattern 1600 may include four PRBs 1601 spanning a four PRB allocation 1604. The pattern 1600 may include a first PCRS sequence 1610 carrying PCRS and a second PCRS sequence 1620 carrying PCRS. A first PCRS sequence 1610 may be carried at a first subcarrier frequency within the four PRB allocation 1604 and may correspond to a first antenna port and a second antenna port multiplexed in a TDM manner. A second PCRS sequence 1620 may be carried at a second subcarrier frequency within four PRB allocation 1604 and may correspond to a third antenna port and a fourth antenna port multiplexed in a TDM manner. In various embodiments, pattern 1600 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 1600 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 1604. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within four PRB allocation 1604 and the second subcarrier frequency may be subcarrier frequency 31 within four PRB allocation 1604. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port of the first RE set 1611 in odd OFDM symbols, which may correspond to the first PCRS sequence 1610, may be antenna port 40. The second antenna port, which may correspond to the second RE set 1612 in the even OFDM symbols of the first PCRS sequence 1610, may be antenna port 42. For some embodiments, the third antenna port of the third RE set 1623 in the odd OFDM symbols, which may correspond to the second PCRS sequence 1620, may be antenna port 41. A fourth antenna port, which may correspond to the fourth RE set 1624 in the even OFDM symbols of the second PCRS sequence 1620, may be antenna port 43. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be other antenna ports.

In some embodiments, there may be multiple PCRS antenna ports available (e.g., four PCRS antenna ports), two of which may be multiplexed over TDM. In these embodiments, if four MU-MIMO are scheduled in the uplink, those four PCRS antenna ports may be of limited use. Many transmissions may be single rank, space-frequency block coding (SFBC), and rank-2/rank-4 transmissions in a UE under SU-MIMO arranged to use a single UL PCRS antenna port. In two MU-MIMO, only two antenna ports may be needed and TDM may not be employed. non-TDM may advantageously provide a doubled reference signal to the receiver for compensating for phase noise, and thus, it may be beneficial for higher Modulation and Coding Scheme (MCS) transmissions.

In one embodiment, in the case of TDM in UL PCRS, UL DCI may include a 1-bit indication to configure a corresponding UE to transmit PCRS using two PCRS antenna ports, which may be TDM in a given RE location. (the RE locations may include subcarrier frequencies carrying one or more REs and/or one or more OFDM symbols). The UL DCI may thus include a 1-bit indication to configure the corresponding UE to transmit the PCRS in a non-TDM manner for a given RE location.

For example, referring to fig. 16, there may be four PCRS antenna ports. With a 1-bit indication with a first value (e.g., a value of 0), the corresponding UE may send the PCRS sequence only in a single PCRS antenna port (this may be signaled or may be implicitly determined, e.g., from the xPUSCH DMRS antenna port). With a 1-bit indication having a second value (e.g., a value of 1), the corresponding UE may use two PCRS antenna ports for UL PCRS transmission (e.g., both antenna port 40 and antenna port 42 if the signaled or implicitly determined DMRS antenna port is antenna port 40 or antenna port 42). The eNB may then receive the two antenna ports (e.g., antenna port 40 and antenna port 42) together from the UE and may utilize both to compensate for phase noise.

For some embodiments, when the DMRS utilizes two antenna ports located in different RE positions, the indication bit may be set to have a first value (e.g., a value of 0) or a second value (e.g., a value of 1), and two PCRS ports in the RE where the primary DMRS antenna port (in a transmission mode of multiple DMRS ports) is located may be utilized. In some embodiments, the primary DMRS antenna port may be defined as the DMRS antenna port having the lowest DMRS antenna port number. For some embodiments, the primary DMRS antenna port may be defined as the DMRS antenna port having the highest DMRS antenna port number.

For example, an xPUSCH transmission may have two DMRS antenna ports linked to a PCRS antenna port (e.g., antenna port 40 and antenna port 41). In some embodiments, the primary DMRS antenna port may be assumed to be the DMRS antenna port linked to the PCRS antenna port based on the lowest port number selection rule. In these embodiments, a value of 1 for the proposed indication bit may indicate: the primary DMRS antenna port may be linked to the PCRS antenna port 40, and the UE may transmit the PCRS on both the PCRS antenna port 40 and the PCRS antenna port 42. The PCRS antenna port 40 may be a primary antenna port and the PCRS antenna port 42 may be a secondary antenna port.

For some embodiments, the primary DMRS antenna port may be assumed to be the DMRS antenna port linked to the PCRS antenna port based on the highest port number selection rule. In these embodiments, a value of 1 for the proposed indication bit may indicate: the primary DMRS antenna port may be linked to the PCRS antenna port 41, and the UE may transmit the PCRS on both the PCRS antenna port 41 and the PCRS antenna port 43. The PCRS antenna port 41 may be a primary antenna port and the PCRS antenna port 43 may be a secondary antenna port.

From the perspective of the UE, various procedures and/or proposed operations may be provided. In a first procedure, the UE may detect xPDCCH with DCI format a1 in subframe n for the UE, where a dual PCRS field in the DCI may be set to 0. Then, the UE may be set to transmit the UL PCRS sequence in subframe n + k using the primary PCRS antenna port, which may be the antenna port with the lowest antenna port number among the associated PCRS antenna ports in the DCI.

In a second procedure, the UE may detect xPDCCH with DCI format a1 in subframe n for the UE, where the dual PCRS field in the DCI may be set to 1. Then, the UE may be configured to transmit the UL PCRS sequence in subframe n + k using the primary PCRS antenna port and the secondary PCRS antenna port, where the secondary PCRS antenna port may share the RE location with the primary PCRS antenna port.

In a third procedure, the UE may detect xPDCCH with DCI format a2 in subframe n for the UE, where the dual PCRS field in the DCI may be set to 0. Then, the UE may be set to transmit the UL PCRS sequence in subframe n + k using the primary PCRS antenna port, which may be the antenna port with the lowest antenna port number among the associated PCRS antenna ports in the DCI.

In a fourth procedure, the UE may detect xPDCCH with DCI format a2 in subframe n for the UE, where the dual PCRS field in the DCI may be set to 1. Let us then, the UE may be set to transmit the UL PCRS sequence in subframe n + k using the primary PCRS antenna port and the secondary PCRS antenna port, wherein the secondary PCRS antenna port may share the RE position with the primary PCRS antenna port.

For each procedure, the UE may identify a UL PCRS antenna port from among one or more corresponding xPUSCH DMRS antenna ports. For example, the UL PCRS antenna port and/or the xPUSCH DMRS antenna port may be one or more of antenna port 40, antenna port 41, antenna port 42, and/or antenna port 43.

In various embodiments, the number of antenna ports for the PCRS may be different from the number of antenna ports for the DMRS. Some embodiments may not include an implicit mapping between the PCRS antenna ports and the DMRS antenna ports. For example, a UE may have multiple DMRS antenna ports, and those DMRS ports may be multiplexed in the code domain, e.g., by using OCC (orthogonal cover code). Thus, for a given RE and/or subcarrier frequency index, a UE may have multiple signals for various antenna ports. For example, in some embodiments, the antenna ports may be multiplied by +1(OCC) and the other antenna ports may be multiplied by-1 (OCC).

In the first set of embodiments for relating PCRS antenna port numbers and DMRS antenna port numbers, a PCRS antenna port may correspond to one or more sets of dedicated sequences. For the first set of embodiments, the PCRS antenna ports and/or the set of PCRS antenna ports may be explicitly indicated in DCI or in higher layer signaling. The PCRS sequence may be determined by a PCRS antenna port number. The RE positions (or RE symbol positions in the TDM case) may be fixed according to the PCRS antenna port number.

For example, in some embodiments, DL PCRS REs may be carried in subcarrier frequency 23 and subcarrier frequency 24 every four PRBs with respect to PCRS antenna port 61 and PCRS antenna port 60, respectively. The PCRS antenna port number or the assigned REs indicated by the related signaling may be used every four PRBs among the allocated xPDSCH PRBs, regardless of the DMRS antenna port usage. Every four PRBs, there may be a deterministic PCRS sequence set per PCRS antenna port.

Fig. 17 illustrates an example pattern of DL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure. The pattern 1700 may include four PRBs 1701 spanning a four PRB allocation 1704. The pattern 1700 may include a first PCRS sequence 1710 carrying PCRS and a second PCRS sequence 1720 carrying PCRS. The first PCRS sequence 1710 may be carried at a first subcarrier frequency within the four PRB allocation 1704 and may correspond to a first antenna port. A second PCRS sequence 1720 may be carried at a second subcarrier frequency within the four PRB allocation 1704 and may correspond to a second antenna port. In various embodiments, pattern 1700 can be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 1700 can be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first and second subcarrier frequencies may be substantially distributed around the center of the 48 subcarrier frequencies of the four PRB allocation 1704, which may advantageously address potentially high inter-carrier interference (ICI) that may exist at the center of the four PRB allocation 1704. In some embodiments, the first subcarrier frequency may be subcarrier frequency 23 within the four PRB allocation 1704 and the second subcarrier frequency may be subcarrier frequency 24 within the four PRB allocation 1704. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

For some embodiments, the DL PCRS may be associated with the xPDSCH and may be transmitted on one or more antenna ports signaled in the DCI (e.g., antenna port and/or antenna port p-61). Table 1 provides signaling that may be added in DL DCI to indicate one or more antenna ports for transmitting DL PCRS.

Table 1: additional DL DCI signaling

For some embodiments, for example, if an xPDSCH transmission is associated with a corresponding antenna port, a DL PCRS may be present and may be an effective reference for phase noise compensation. In some embodiments, DL PCRS may be transmitted on PRBs and symbols (e.g., in REs) to which the corresponding xPDSCH is mapped. For some embodiments, the DL PCRS may be the same in a number of symbols (up to and including all symbols) corresponding to the xPDSCH allocation.

In some embodiments, for one or more antenna ports p e {60,61}, the reference signal sequence r (m) may be defined by the following equation:

For some embodiments, the pseudo-random sequence generator may be initialized at the beginning of each subframe as follows:

if a higher layer is not provided for

Value of (1), then quantity

i is 0,1 may be represented by

Otherwise can be given by

It is given. n is_SCIDUnless otherwise indicated, the value of (b) may be zero. For xDSCH transmission, n_SCIDMay be given by a DCI format associated with xPDSCH transmission.

In some embodiments, for antenna port p ∈ {60,61}, the assigned frequency domain index n for the corresponding xPDSCH transmission is_PRB' a part of the reference signal sequence r (m) in the physical resource block may be set to complex-valued modulation symbols mapped to all xPDSCH symbols in the subframe

The following were used:

Resource allocation bandwidth with respect to number of resource blocks

in the equation, for a given subframe, k may be an index (e.g., subcarrier frequency or subcarrier frequency index) corresponding to a subcarrier location, l 'may be a symbol index within the subframe, m' may be a PRB index,

and

there may be first and last symbol indexes of xPDSCH.

For some embodiments, when the slave is connected to the master

To

In transmitting xPDSCH, four PRB allocation 1604 may include REs for PCRS for antenna port 60 and antenna port 61.

In another example, for a first set of PCRS antenna ports including

PCRS antenna ports

40 and 41 and for a second set of PCRS antenna ports including

PCRS antenna ports

42 and 43, respectively, a UL PCRS RE may be carried in subcarrier frequency 16 and subcarrier frequency 31 every four PRBs. Every four PRBs, there may be a deterministic PCRS sequence set per PCRS antenna port.

Fig. 18 illustrates an example pattern of UL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure. The pattern 1800 may include four PRBs 1801 spanning a four PRB allocation 1804. The pattern 1800 may include a first PCRS sequence 1810 carrying PCRS and a second PCRS sequence 1820 carrying PCRS. The first PCRS sequence 1810 may be carried at a first subcarrier frequency within the four PRB allocation 1804 and may correspond to a first antenna port and a second antenna port multiplexed in a TDM manner. A second PCRS sequence 1820 may be carried at a second subcarrier frequency within the four PRB allocation 1804 and may correspond to a third antenna port and a fourth antenna port multiplexed in a TDM manner. In various embodiments, pattern 1800 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 1800 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 1804. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within the four PRB allocation 1804 and the second subcarrier frequency may be subcarrier frequency 31 within the four PRB allocation 1804. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port of the first RE set 1811 in the odd OFDM symbols, which may correspond to the first PCRS sequence 1810, may be antenna port 40. The second antenna port, which may correspond to the second RE set 1812 in the even OFDM symbol of the first PCRS sequence 1810, may be antenna port 42. For some embodiments, the third antenna port, which may correspond to the third set of REs 1823 in the odd OFDM symbols of the second PCRS sequence 1820, may be antenna port 41. A fourth antenna port, which may correspond to the fourth set of REs 1824 in the even OFDM symbols of the second PCRS sequence 1820, may be antenna port 43. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be other antenna ports.

Fig. 19 illustrates an example pattern of UL PCRS transmission over a four PRB allocation according to some embodiments of the present disclosure. The pattern 1900 may include four PRBs 1901 spanning a four PRB allocation 1904. The pattern 1900 may include a first PCRS sequence 1910 carrying a PCRS and a second PCRS sequence 1920 carrying a PCRS. A first PCRS sequence 1910 may be carried at a first subcarrier frequency within the four PRB allocation 1904 and may correspond to a first antenna port and a second antenna port multiplexed in a TDM manner. A second PCRS sequence 1920 may be carried at a second subcarrier frequency within the four PRB allocation 1904 and may correspond to a third antenna port and a fourth antenna port multiplexed in a TDM manner. In various embodiments, pattern 1900 may be substantially similar to pattern 200 (and/or other patterns disclosed herein), and elements of pattern 1900 may be substantially similar to elements of pattern 200 (and/or other patterns disclosed herein).

In various embodiments, the first subcarrier frequency and the second subcarrier frequency may be substantially evenly distributed across the 48 subcarrier frequencies of the four PRB allocation 1904. In some embodiments, the first subcarrier frequency may be subcarrier frequency 16 within four PRB allocation 1904 and the second subcarrier frequency may be subcarrier frequency 31 within four PRB allocation 1904. For various embodiments, the subcarrier frequencies may be other subcarrier frequencies.

In some embodiments, the first antenna port of the first RE set 1911 in odd OFDM symbols, which may correspond to the first PCRS sequence 1910, may be antenna port 42. The second antenna port, which may correspond to the second RE set 1912 in the even OFDM symbols of the first PCRS sequence 1910, may be antenna port 40. For some embodiments, the third antenna port of the third RE set 1923 in the odd OFDM symbols, which may correspond to the second PCRS sequence 1920, may be antenna port 43. The fourth antenna port, which may correspond to the fourth RE set 1924 in the even OFDM symbols of the second PCRS sequence 1920, may be antenna port 41. In various embodiments, the first antenna port, the second antenna port, the third antenna port, and/or the fourth antenna port may be other antenna ports.

With respect to fig. 18 and 19, in various embodiments, UL PCRS may be associated with xPUSCH transmission. In some embodiments, the UL PCRS may be sent on the antenna port assigned to the UE (e.g., antenna port p e {40,41,42,43 }). For some embodiments, for example, if xPUSCH transmission is associated with a corresponding antenna port, UL PCRS may be present and may be an effective reference for phase noise compensation. In some embodiments, the UL PCRS may be transmitted on the PRB and symbol (e.g., in the RE) to which the corresponding xPUSCH is mapped.

In some embodiments, for one or more of antenna ports p e {40,41,42,43}, the reference signal sequence r (m) may be defined by the following equation:

if a higher layer is not provided for

Value of (1), then quantity

i is 0,1 may be represented by

Otherwise can be given by

It is given. n is_SCIDUnless otherwise indicated, the value of (b) may be zero. For xUSCH transmission, n_SCIDMay be given by a DCI format associated with xPUSCH transmission.

In some embodiments, for antenna port p e {40,41,42,43}, the assigned frequency domain index n for the corresponding xPUSCH transmission is assigned_PRBA part of the reference signal sequence r (m) may be set to complex-valued modulation symbols mapped to all xPUSCH symbols in the subframe

The following were used:

starting physical resource block index for xUSCH physical resource allocation

Total number of assigned xUSCH physical resource blocks

in the formula, for a given sub-frame,

may be a PRB index, l' may be a symbol index within a subframe, and

may be a symbol index of the end of xPUSCH. For example, m "may be 0 for the pattern 1800 of FIG. 18, and m" may be 1 for the pattern 1900 of FIG. 19.

The resource elements (k, l) used to transmit the UE-specific PCRS on any antenna port in set S (where S ═ {40}, S ═ {41}, S ═ 42} and S ═ 43}) may not be used to transmit xPUSCH on any antenna port in the same subframe.

For some embodiments, the method comprises

Time of day, four PRB allocation1804 and/or four PRB allocation 1904 may include REs for PCRS for antenna port 40, antenna port 41, antenna port 42, and/or antenna port 43.

In the second set of embodiments for relating to PCRS antennas and DMRS antenna port numbers, the DMRS antenna port and PCRS antenna port may have an implicit relationship. Some embodiments may use a sequence of the lowest DMRS antenna port in the subframe or a sequence of the highest DMRS antenna port in the subframe. This sequence can be applied even if there is no DMRS signal to be transmitted by the transmitting side in the same PCRS RE position. Some embodiments may use the sequence of the lowest DMRS antenna port in the PCRS RE position. The sequence may use one or more DMRS symbols as one or more additional PCRS symbols.

Among the plurality of DMRS antenna ports, some DMRS antenna ports may be used for a particular transmission. For a PCRS antenna port with a fixed location, and for a DMRS with Frequency Division Multiplexing (FDM) with multiple DMRS ports, there may be cases where: there is no DMRS for some PCRS RE locations. Thus, various rules may advantageously specify the PCRS sequences that may be sent under these circumstances.

For DL transmission, the DL PCRS may be a cell-specific signal. All MU-MIMO users may receive DL PCRS antenna ports for PCRS. The PCRS sequence for a PCRS antenna port may vary depending on the rank in MU-MIMO multiplexing or SU-MIMO transmission. For a given PCRS antenna port, a DMRS sequence may be selected among a plurality of DMRS antenna ports.

For example, DMRS port selection per TB may be determined based on various criteria. For SU-MIMO examples, the lowest DMRS port number or the highest DMRS port number may be used per TP for the reference. In a single rank example, for a given frequency location, the RS sequence of a single DMRS antenna port may be used for PCRS. The receiver may determine a PCRS antenna port number by means of the DMRS antenna port indication. In SFBC or spatial multiplexing instances, for a given frequency location, the RS sequence of the lowest DMRS antenna port number (or the highest DMRS antenna port number) may be used for PCRS. For example, the eNB may transmit a rank-2 transmission to user a using DMRS antenna port 50 and DMRS antenna port 52, and then the PCRS port may use the DMRS sequence for port 50 (according to the lowest DMRS antenna port rule).

For SU-MIMO instances, the lowest DMRS port number or the highest DMRS port number in the PCRS RE locations may be used on a per TP basis with respect to the reference; and possible DMRS antenna ports may be limited to available DMRS antenna ports in a PCRS RE location. This may advantageously utilize one or more DMRS symbols as one or more additional PCRS symbols.

For the MU-MIMO example, the eNB may pick MU-MIMO users and may use substantially similar rules as SU-MIMO rules. The DCI may include a reference antenna port number or related information for a PCRS sequence and may be provided to other MU-MIMO users. A predetermined DMRS antenna port corresponding to a TP index may be used in the MU-MIMO case.

In the third set of embodiments for the PCRS antenna port number and DMRS antenna port number concerned, different RE positions may be used depending on the DMRS antenna port. Fig. 20 illustrates an example pattern of DL DMRS transmission on a four PRB allocation, according to some embodiments of the present disclosure. The pattern 2000 may include four PRBs 2001 spanning a four PRB allocation 2004. The pattern 2000 may further include a DMRS sequence 2090 spanning 48 subcarrier frequencies in OFDM symbol 2. In some embodiments, the DMRS sequence 2090 in subcarrier frequency 0 may correspond to one of antenna port 10 or antenna port 20 or antenna port 40. For some embodiments, the DMRS sequence 2090 in subcarrier frequency 1 may correspond to one of antenna port 21 or antenna port 41. In some embodiments, the DMRS sequence 2090 in subcarrier frequency 2 may correspond to antenna port 42. For some embodiments, the DMRS sequence 2090 in subcarrier frequency 3 may correspond to antenna port 43. The correspondence between antenna ports and DMRS sequence 2090 in subcarrier frequencies 0 to 3 may be repeated every 4 subcarrier frequencies. In various embodiments, the DMRS sequences 2090 in subcarrier frequencies 0 through 47 may correspond to various antenna ports.

In some instances, DMRS signals may not be present in the PCRS REs. Different PCRS RE positions may instead depend on the usage of DMRS ports. The location may be determined by an associated DMRS port location, and the PCRS sequence may be selected by one of the associated DMRS sequences based on a lowest DMRS port number rule or a highest DMRS port number rule.

In some example DMRS antenna port mappings, there may be FDM between antenna port 10 or one of

antenna ports

20 or 40, one of

antenna ports

21 or 41, antenna port 42, and antenna port 43, and Code Division Multiplexing (CDM) may be used within a set (e.g., between

antenna ports

10, 20, and 40).

Thus, in one example, when the eNB sends rank-2 transmissions using DMRS antenna port 10 and DMRS antenna port 20, the RE locations 24 (e.g., subcarrier frequencies 24, which may correspond to antenna port 10 or antenna port 20 or antenna port 40) may be used and the same sequence under DMRS antenna port 10 (according to the lowest antenna port rule) may be used for PCRS transmissions of TPs.

In another example, when the eNB sends rank-2 transmissions using DMRS antenna port 21 and DMRS antenna port 41, the RE locations 25 (e.g., subcarrier frequencies 25, which may correspond to antenna port 21 or antenna port 41) may be used and the same sequence under DMRS antenna port 21 (according to the lowest antenna port rule) may be used for PCRS transmissions of TPs.

In another example, when the eNB sends rank-2 transmissions using DMRS antenna ports 21 and DMRS antenna ports 42, RE locations 25 (e.g., subcarrier frequencies 25) may be used (according to the lowest antenna port rule) or RE locations 26 (e.g., subcarrier frequencies 26) may be used (according to the highest antenna port rule) for PCRS transmissions of TPs.

Fig. 21 illustrates an eNB and a UE according to some embodiments of the present disclosure. Fig. 21 includes a block diagram of an eNB 2110 and a UE 2130 that are operable to co-exist with each other and with other elements of an LTE network. A high-level simplified architecture of eNB 2110 and UE 2130 is described so as not to obscure the embodiments. It should be noted that in some embodiments, eNB 2110 may be a stationary non-mobile device.

eNB 2110 is coupled to one or more antennas 2105, and UE 2130 is similarly coupled to one or more antennas 2125. However, in some embodiments, eNB 2110 may incorporate or include antenna 2105, and UE 2130 may incorporate or include antenna 2125 in various embodiments.

In some embodiments, antenna 2105 and/or antenna 2125 may include one or more directional or omnidirectional antennas, including monopole antennas, dipole antennas, loop antennas, patch antennas, microstrip antennas, coplanar antennas, or other types of antennas suitable for transmission of RF signals. In some MIMO (multiple input multiple output) embodiments, the antennas 2105 are separated to exploit spatial diversity.

eNB 2110 and UE2130 are operable to: communicating with each other over a network (e.g., a wireless network), the eNB 2110 and the UE2130 may communicate with each other over a wireless communication channel 2150 having both a downlink path from the eNB 2110 to the UE2130 and an uplink path from the UE2130 to the eNB 2110.

As shown in fig. 21, in some embodiments, the eNB 2110 may include physical layer circuitry 2112, MAC (medium access control) circuitry 2114, a processor 2116, memory 2118 and hardware processing circuitry 2120. Those skilled in the art will appreciate that other components not shown may be used in addition to those shown to form a complete eNB.

In some embodiments, the physical layer circuitry 2112 includes a transceiver 2113 for providing signals to and from the UE 2130. The transceiver 2113 provides signals to and from the UE or other devices using one or more antennas 2105. In some embodiments, the MAC circuit 2114 controls access to the wireless medium. The memory 2118 may be or include one or more storage media (e.g., magnetic storage media (e.g., tape or disk), optical storage media (e.g., optical disk), electronic storage media (e.g., conventional hard disk drive, solid state drive, or flash memory-based storage media), or any tangible or non-transitory storage media). The hardware processing circuit 2120 may include logic devices or circuits for performing various operations. In some embodiments, the processor 2116 and memory 2118 are arranged to perform the operations of the hardware processing circuitry 2120 (e.g., the operations described herein with reference to the logic devices and circuitry within the eNB 2110 and/or the hardware processing circuitry 2120).

Thus, in some embodiments, the eNB 2110 may be a device that includes an application processor, memory, one or more antenna ports, and an interface for allowing the application processor to communicate with another device.

As also shown in fig. 21, in some embodiments, the UE 2130 may include physical layer circuitry 2132, MAC circuitry 2134, a processor 2136, a memory 2138, hardware processing circuitry 2140, a wireless interface 2142, and a display 2144. Those skilled in the art will appreciate that other components not shown may be used in addition to those shown to form a complete UE.

In some embodiments, the physical layer circuitry 2132 includes a transceiver 2133 for providing signals to and from the eNB 2110 (as well as other enbs). The transceiver 2133 provides signals to and from an eNB or other device using one or more antennas 2125. In some embodiments, MAC circuit 2134 controls access to the wireless medium. Memory 2138 may be or include one or more storage media (e.g., magnetic storage media (e.g., tape or disk), optical storage media (e.g., optical disk), electronic storage media (e.g., conventional hard disk drive, solid state drive, or flash memory based storage media), or any tangible or non-transitory storage media). The wireless interface 2142 may be arranged to allow the processor to communicate with another device. The display 2144 may provide a visual and/or tactile display (e.g., a touch screen display) for user interaction with the UE 2130. The hardware processing circuitry 2140 may comprise logic devices or circuitry for performing various operations. In some embodiments, the processor 2136 and the memory 2138 may be arranged to perform the operations of the hardware processing circuitry 2140 (e.g., the operations described herein with reference to logic devices and circuitry within the UE 2130 and/or the hardware processing circuitry 2140).

Thus, in some embodiments, UE 2130 may be a device that includes an application processor, memory, one or more antennas, a wireless interface to allow the application processor to communicate with another device, and a touch screen display.

The elements of fig. 21, as well as elements of other figures having the same name or number, may operate or function in the manner described herein with respect to any of these figures (although the operation and function of these elements is not limited to these descriptions). For example, fig. 22-23 and 30 also depict embodiments of an eNB, hardware processing circuitry of an eNB, a UE and/or hardware processing circuitry of a UE, and the embodiments described with respect to fig. 21, 22-23 and 30 may operate or function in the manner described herein with respect to any of the figures.

Further, while eNB 2110 and UE 2130 are each described as having several separate functional elements, one or more of the functional elements may be combined and may be implemented by combinations of software-configured elements and/or other hardware elements. In some embodiments of the disclosure, a functional element may refer to one or more processes operating on one or more processing elements. Examples of software and/or hardware configured elements include a Digital Signal Processor (DSP), one or more microprocessors, a DSP, a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a Radio Frequency Integrated Circuit (RFIC), and so forth.

Fig. 22 illustrates hardware processing circuitry for PCRS for an eNB according to some embodiments of the present disclosure. Referring to fig. 21, the eNB may include various hardware processing circuitry discussed herein (e.g., hardware processing circuitry 2200 of fig. 22), which may in turn include logic devices and/or circuitry operable to perform various operations. For example, in fig. 21, the eNB 2110 (or various elements or components thereof (e.g., hardware processing circuitry 2120) or a combination of elements or components thereof) may include some or all of these hardware processing circuitry.

In some embodiments, one or more devices or circuits within these hardware processing circuits may be implemented by combinations of software-configured elements and/or other hardware elements. For example, the processor 2116 (and/or one or more other processors that the eNB 2110 may include), the memory 2118, and/or other elements or components of the eNB 2110 (which may include the hardware processing circuitry 2120) may be arranged to perform operations of these hardware processing circuitry (e.g., operations described herein with reference to devices and circuitry within these hardware processing circuitry). In some embodiments, processor 2116 (and/or one or more other processors that may be included by eNB 2110) may be a baseband processor.

Returning to fig. 22, an apparatus that may be operable as an eNB 2110 (or another eNB or base station) communicating with one or more UEs over a wireless network may include hardware processing circuitry 2200. In some embodiments, hardware processing circuit 2200 may include one or more antenna ports 2205 operable to provide various transmissions over a wireless communication channel (e.g., wireless communication channel 2150). The antenna port 2205 may be coupled to one or more antennas 2207 (which may be antennas 2105). In some embodiments, the hardware processing circuitry 2200 may incorporate the antenna 2207, while in other embodiments, the hardware processing circuitry 2200 may be coupled only to the antenna 2207.

The antenna port 2205 and antenna 2207 may be operable to: providing signals from the eNB to a wireless communication channel and/or UE, and may be operable to: signals are provided to the eNB from the UE and/or the wireless communication channel. For example, antenna port 2205 and antenna 2207 may be operable to: transmission from the eNB 2110 to the wireless communication channel 2150 (and from there to the UE 2130 or to another UE) is provided. Similarly, the antenna 2207 and the antenna port 2205 may be operable to: transmission from the wireless communication channel 2150 (and, in addition, from the UE 2130 or another UE) to the eNB 2110 is provided.

Hardware processing circuit 2200 may include various circuits operable according to various embodiments discussed herein. Referring to fig. 22, hardware processing circuit 2200 may include a first circuit 2210, a second circuit 2220, a third circuit 2230 and/or a fourth circuit 2240.

In some embodiments of hardware processing circuit 2200, first circuit 2210 may be operable to: a subframe configuration including one or more OFDM symbols is established for one of UL transmission or DL transmission. The second circuit 2220 may be operable to: at least a portion of the one or more OFDM symbols are allocated one or more PCRS REs at one or more subcarrier frequencies to carry a PCRS signal. The first circuit 2210 may provide information about the subframe configuration to the second circuit 2220 via the interface 2215.

In some embodiments, one or more OFDM symbols may be used for data channel transmission. For some embodiments, one or more OFDM symbols may have indices from 3 to 13 within an OFDM subframe that includes symbols that may have indices from 0 to 13. In some embodiments, the one or more subcarrier frequencies may be substantially evenly distributed across the set of 48 subcarrier frequencies. For some embodiments, the one or more subcarrier frequencies may be distributed substantially around the center of the set of 48 subcarrier frequencies.

In some embodiments, the third circuit 2230 may be operable to: one or more PCRS REs from at least a portion of one or more OFDM symbols are demapped at one or more subcarrier frequencies. One or more OFDM symbols may be used for UL transmission. Second circuitry 2220 may provide information regarding the allocation of PCRS REs to third circuitry 2230 via interface 2224.

For some embodiments, the fourth circuit 2240 may be operable to: the one or more PCRS REs are mapped to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies. One or more OFDM symbols are used for DL transmission. The second circuitry 2220 may provide information regarding the allocation of PCRS REs to the fourth circuitry 2240 via interface 2222.

In some embodiments, the second circuit 2220 may be operable to: one or more DMRS REs corresponding to one or more subcarrier frequencies are allocated. The one or more DMRS REs may carry one or more respectively corresponding DMRS signals at symbols indexed 2 within an OFDM subframe and at one or more subcarrier frequencies. The PCRS signal may be the same as the DMRS signal.

For some embodiments, the second circuit 2220 may be operable to: at least a portion of the one or more OFDM symbols are allocated one or more additional PCRS REs at one or more additional subcarrier frequencies to carry additional PCRS signals. The one or more PCRSs may correspond to a first antenna port and the one or more additional PCRSs may correspond to a second antenna port.

In some embodiments, the one or more PCRS REs may include a first set of PCRS REs at a first subcarrier frequency and corresponding to a first antenna port, and the one or more PCRS REs may include a second set of PCRS REs at a second subcarrier frequency and corresponding to a second antenna port. For some embodiments, the first subcarrier frequency and the second subcarrier frequency may be within a set of subcarrier frequencies having indices from 0 to 47, and the second subcarrier frequency may be spaced from the first subcarrier frequency by one of 14 subcarrier frequencies or 15 subcarrier frequencies. In some embodiments, the first subcarrier frequency may have an index of 16 within a set of subcarrier frequencies having indices from 0 to 47, and the second subcarrier frequency may have an index of 31 within the set of subcarrier frequencies.

For some embodiments, the first subcarrier frequency may have an index of 23 within a set of subcarrier frequencies having indices from 0 to 47, and the second subcarrier frequency may have an index of 24 within the set of subcarrier frequencies. In some embodiments, the first subcarrier frequency may have an index of 16 within a set of subcarrier frequencies having indices from 0 to 47, and the second subcarrier frequency may have an index of 32 within the set of subcarrier frequencies. For some embodiments, the one or more PCRS REs may include a third set of PCRS REs at a third subcarrier frequency and corresponding to a third antenna port.

In some embodiments, the first subcarrier frequency may have an index of 16 within a set of subcarrier frequencies having indices from 0 to 47, the second subcarrier frequency has an index of 31 within the set of subcarrier frequencies, and the third subcarrier frequency has an index of 40 within the set of subcarrier frequencies. For some embodiments, the first subcarrier frequency may have an index of 23 within a set of subcarrier frequencies having indices from 0 to 47, the second subcarrier frequency may have an index of 24 within the set of subcarrier frequencies, and the third subcarrier frequency may have an index of 36 within the set of subcarrier frequencies.

In some embodiments of hardware processing circuit 2200, first circuit 2210 may be operable to: a subframe configuration including one or more OFDM symbols is established for UL transmission. The second circuit 2220 may be operable to: one or more PCRS REs carrying the PCRS signals are demapped at the subcarrier frequency with respect to at least a portion of the one or more OFDM symbols. The one or more PCRS REs may be periodically spaced between one or more OFDM symbols.

In some embodiments, one or more of the PCRS REs may have an odd index among the OFDM symbols. For some embodiments, one or more of the PCRS REs may have an even index among the OFDM symbols. In some embodiments, one or more OFDM symbols may have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

For some embodiments, the third circuit 2230 may be operable to: one or more additional PCRS REs carrying additional PCRS signals are demapped. The one or more PCRS REs may have an odd index among OFDM symbols, and the one or more additional PCRS REs may have an even index among OFDM symbols.

In some embodiments, the third circuit 2230 may be operable to: one or more additional PCRS REs carrying additional PCRS signals are demapped at an additional subcarrier frequency with respect to at least a portion of the one or more OFDM symbols. The one or more PCRS REs may be periodically spaced between one or more OFDM symbols.

For some embodiments, the subcarrier frequencies may have an index X within a first set of N subcarrier frequencies having indices from 0 to N-1, and the additional subcarrier frequencies may have an index X within a second set of N subcarrier frequencies having indices from 0 to N-1, the second set of N subcarrier frequencies adjacent to the first set of N subcarrier frequencies. In some embodiments, the one or more PCRS REs may have even indices among OFDM symbols and the one or more PCRS REs may have odd indices among OFDM symbols.

In some embodiments of hardware processing circuit 2200, first circuit 2210 may be operable to: a subframe configuration comprising a plurality of OFDM symbols is established for UL transmission. The third circuit 2230 may be operable to: demap, at a subcarrier frequency, a first set of one or more REs carrying a primary PCRS signal with respect to a first portion of one or more OFDM symbols, and may be operable to: a second set of one or more REs carrying a secondary PCRS signal is demapped at a subcarrier frequency with respect to a second portion of the one or more OFDM symbols. The first portion of the one or more OFDM symbols may have an even symbol index and the second portion of the one or more OFDM symbols may have an odd symbol index.

In some embodiments, the first set of one or more REs may correspond to a primary PCRS antenna port and the second set of one or more REs may correspond to a secondary PCRS antenna port different from the primary PCRS antenna port. For some embodiments, the port number of the primary PCRS antenna port may be greater than the port number of the secondary PCRS antenna port. In some embodiments, the port number of the primary PCRS antenna port may be less than the port number of the secondary PCRS antenna port.

For some embodiments, the primary and secondary PCRS antenna ports may be indicated in one of a DCI transmission or a higher layer signaling transmission. In some embodiments, the index of the one or more REs carrying the primary PCRS signal may be predetermined based on a port number of the primary antenna port, and the index of the one or more REs carrying the secondary PCRS signal may be predetermined based on a port number of the secondary antenna port.

In some embodiments, the third circuit 2230 may be operable to: the additional REs carrying the DMRS are demapped at a subcarrier frequency with respect to one or more additional OFDM symbols. The additional REs may correspond to DMRS antenna ports.

For some embodiments, the DMRS antenna port may be one of: a primary PCRS antenna port corresponding to a first set of one or more REs; or a secondary PCRS antenna port corresponding to the second set of one or more REs.

In some embodiments, the third circuit 2230 may be operable to: one or more additional REs carrying one or more respectively corresponding DMRSs are demapped with respect to the one or more additional OFDM symbols. The subcarrier frequencies may be within a set of 48 subcarrier frequencies and one or more additional OFDM symbols are mapped to one or more of the set of 48 subcarrier frequencies.

For some embodiments, the primary PCRS antenna port corresponding to the first set of one or more REs may be determined from one of: a lowest antenna port corresponding to the one or more DMRSs, or a highest antenna port corresponding to the one or more DMRSs. In some embodiments, a primary PCRS antenna port, which may correspond to the first set of one or more REs, may be determined from an antenna port corresponding to one of the DMRSs at the subcarrier frequency.

In some embodiments, the first circuit 2210, the second circuit 2220, the third circuit 2230 and/or the fourth circuit 2240 may be implemented as separate circuits. In other embodiments, the first circuit 2210, the second circuit 2220, the third circuit 2230 and/or the fourth circuit 2240 may be combined and implemented together in a circuit without changing the essence of the embodiments.

Fig. 23 illustrates hardware processing circuitry for PCRS of a UE according to some embodiments of the present disclosure. Referring to fig. 21, the UE may include various hardware processing circuitry discussed herein (e.g., hardware processing circuitry 2300 of fig. 23), which may in turn include logic devices and/or circuitry operable to perform various operations. For example, in fig. 21, the UE 2130 (or various elements or components thereof (e.g., the hardware processing circuitry 2140) or a combination of elements or components thereof) may include some or all of these hardware processing circuitry.

In some embodiments, one or more devices or circuits within these hardware processing circuits may be implemented by combinations of software-configured elements and/or other hardware elements. For example, the processor 2136 (and/or one or more other processors that the UE 2130 may include), the memory 2138, and/or other elements or components of the UE 2130 (which may include the hardware processing circuitry 2140) may be arranged to perform operations of these hardware processing circuitry (e.g., operations described herein with reference to devices and circuitry within these hardware processing circuitry). In some embodiments, processor 2136 (and/or one or more other processors that UE 2130 may include) may be a baseband processor.

Returning to fig. 23, an apparatus that may be operable as a UE 2130 (or another UE or mobile handset) in communication with one or more enbs over a wireless network may comprise hardware processing circuitry 2300. In some embodiments, the hardware processing circuit 2300 may include one or more antenna ports 2305 operable to: various transmissions are provided over wireless communication channels, such as wireless communication channel 2150. The antenna port 2305 may be coupled to one or more antennas 2307 (which may be antennas 2125). In some embodiments, the hardware processing circuit 2300 may incorporate the antenna 2307, while in other embodiments, the hardware processing circuit 2300 may be coupled only to the antenna 2307.

The antenna port 2305 and the antenna 2307 may be operable to: providing a signal from the UE to a wireless communication channel and/or an eNB, and may be operable to: signals are provided to the UE from the eNB and/or the wireless communication channel. For example, antenna port 2305 and antenna 2307 may be operable to: transmission is provided from the UE 2130 to the wireless communication channel 2150 (and from there to the eNB 2110 or to another eNB). Similarly, the antenna 2307 and the antenna port 2305 may be operable to: transmissions are provided from the wireless communication channel 2150 (and, in addition, from the eNB 2110 or another eNB) to the UE 2130.

The hardware processing circuit 2300 may include various circuits operable according to various embodiments discussed herein. Referring to fig. 23, the hardware processing circuit 2300 may include a first circuit 2310, a second circuit 2320, a third circuit 2330, and/or a fourth circuit 2340.

In some embodiments of the hardware processing circuit 2300, the first circuit 2310 may be operable to: a subframe configuration including one or more OFDM symbols is established for one of UL transmission or DL transmission. The second circuit 2320 may be operable to: at least a portion of the one or more OFDM symbols are allocated one or more PCRS REs at one or more subcarrier frequencies to carry a PCRS signal. The first circuit 2310 may provide information regarding subframe configuration to the second circuit 2320 via the interface 2315.

In some embodiments, the third circuit 2330 may be operable to: the one or more PCRS REs are mapped to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies. One or more OFDM symbols may be used for UL transmission. The second circuit 2320 may provide information regarding the allocation of PCRS REs to the third circuit 2330 via the interface 2322.

For some embodiments, the fourth circuit 2340 may be operable to: one or more PCRS REs from at least a portion of one or more OFDM symbols are demapped at one or more subcarrier frequencies. One or more OFDM symbols may be used for DL transmission. The second circuitry 2320 may provide information regarding the allocation of PCRS REs to the fourth circuitry 2340 via the interface 2324.

In some embodiments, the second circuit 2320 may be operable to: one or more DMRS REs corresponding to one or more subcarrier frequencies are allocated. The one or more DMRS REs may carry one or more respectively corresponding DMRS signals at symbols with index 2 within the OFDM subframe and at one or more subcarrier frequencies, and the PCRS signal is identical to the DMRS signal.

For some embodiments, the second circuitry 2320 may be operable to: at least a portion of the one or more OFDM symbols are allocated one or more additional PCRS REs at one or more additional subcarrier frequencies to carry additional PCRS signals. The one or more PCRSs may correspond to a first antenna port and the one or more additional PCRSs may correspond to a second antenna port.

In some embodiments of the hardware processing circuit 2300, the first circuit 2310 may be operable to: a subframe configuration including one or more OFDM symbols is established for UL transmission. The third circuit 2330 may be operable to: the one or more PCRS REs are mapped at a subcarrier frequency with respect to at least a portion of the one or more OFDM symbols to carry a PCRS signal. The one or more PCRS REs may be periodically spaced between one or more OFDM symbols.

For some embodiments, the third circuit 2330 may be operable to: one or more additional PCRS REs are mapped to carry additional PCRS signals. One or more of the PCRS REs may have an odd index among the OFDM symbols. The one or more additional PCRS REs may have an even index among OFDM symbols.

In some embodiments, the third circuit 2330 may be operable to: one or more additional PCRS REs are mapped with respect to at least a portion of the one or more OFDM symbols at an additional subcarrier frequency to carry additional PCRS signals. The one or more PCRS REs may be periodically spaced between one or more OFDM symbols.

In some embodiments of the hardware processing circuit 2300, the first circuit 2310 may be operable to: a subframe configuration comprising a plurality of OFDM symbols is established for UL transmission. The third circuit 2330 may be operable to: mapping a first set of one or more REs with respect to a first portion of one or more OFDM symbols at a subcarrier frequency to carry a primary PCRS signal, and may be operable to: mapping a second set of one or more REs with respect to a second portion of the one or more OFDM symbols at the subcarrier frequency to carry the secondary PCRS signal. The first portion of the one or more OFDM symbols may have an even symbol index and the second portion of the one or more OFDM symbols may have an odd symbol index.

For some embodiments, a dual PCRS indicator carried by the DCI of the PDCCH may enable mapping. In some embodiments, the first set of one or more REs may correspond to a primary PCRS antenna port and the second set of one or more REs may correspond to a secondary PCRS antenna port different from the primary PCRS antenna port. For some embodiments, the port number of the primary PCRS antenna port may be greater than the port number of the secondary PCRS antenna port. In some embodiments, the port number of the primary PCRS antenna port may be less than the port number of the secondary PCRS antenna port.

In some embodiments, the third circuit 2330 may be operable to: additional REs are mapped with respect to one or more additional OFDM symbols at a subcarrier frequency to carry the DMRS. The additional REs may correspond to DMRS antenna ports.

In some embodiments, the third circuit 2330 may be operable to: the one or more additional REs are mapped with respect to the one or more additional OFDM symbols to carry one or more respectively corresponding DMRSs. The subcarrier frequencies may be within a set of 48 subcarrier frequencies and one or more additional OFDM symbols may be mapped to one or more of the set of 48 subcarrier frequencies.

In some embodiments, the first circuit 2310, the second circuit 2320, the third circuit 2330, and/or the fourth circuit 2340 may be implemented as separate circuits. In other embodiments, the first circuit 2310, the second circuit 2320, the third circuit 2330, and the fourth circuit 2340 may be combined and implemented together in circuits without altering the nature of the embodiments.

Fig. 24-26 illustrate methods for PCRS by an eNB, according to some embodiments of the present disclosure. Referring to fig. 21, various methods that may be related to the eNB 2110 and hardware processing circuitry 2120 are discussed herein. While the actions in method 2400 of fig. 24, method 2500 of fig. 25, and method 2600 of fig. 26 are shown in a particular order, the order of the actions can be modified. Thus, the illustrated embodiments may be performed in a different order, and some actions may be performed in parallel. Some of the actions and/or operations listed in fig. 24, 25, and 26 are optional depending on the particular embodiment. The numbering of the acts presented is for the purpose of clarity and is not intended to dictate the order in which the acts must occur. Further, operations from the various flows may be utilized in various combinations.

Further, in some embodiments, a machine-readable storage medium may have executable instructions that when executed cause the eNB 2110 and/or hardware processing circuitry 2120 to perform operations comprising the methods of fig. 24, 25 and 26. These machine-readable storage media may include any of a variety of storage media (e.g., magnetic storage media (e.g., tape or disk), optical storage media (e.g., optical disk), electronic storage media (e.g., conventional hard disk drives, solid state drives, or flash memory-based storage media), or any other tangible or non-transitory storage media).

In some embodiments, an apparatus may include means for performing various acts and/or operations of fig. 24, 25, and 26.

Returning to fig. 24, various methods may be in accordance with various embodiments discussed herein. Method 2400 may include: establish (2410) and assign (2415). Method 2400 may further include: demapping (2420), mapping (2430), assigning (2440), and/or assigning (2450).

In establishing (2410), a subframe configuration comprising one or more OFDM symbols may be established for one of UL transmission or DL transmission. In assigning (2415): at least a portion of the one or more OFDM symbols may be allocated one or more PCRS REs at one or more subcarrier frequencies to carry PCRS signals.

In demapping (2420), the one or more PCRS REs may be demapped from at least a portion of the one or more OFDM symbols at the one or more subcarrier frequencies. One or more OFDM symbols may be used for UL transmission.

In mapping (2430), the one or more PCRS REs may be mapped to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies. One or more OFDM symbols may be used for DL transmission.

In the allocating (2440), one or more DMRS REs corresponding to one or more subcarrier frequencies may be allocated. The one or more DMRS REs may carry one or more respectively corresponding DMRS signals at symbols with index 2 within an OFDM subframe and at one or more subcarrier frequencies. The PCRS signal may be the same as the DMRS signal.

In the assignment (2450): at least a portion of the one or more OFDM symbols may be allocated one or more additional PCRS REs at one or more additional subcarrier frequencies to carry additional PCRS signals. The one or more PCRSs may correspond to a first antenna port and the one or more additional PCRSs may correspond to a second antenna port.

Returning to fig. 25, various methods may be in accordance with various embodiments discussed herein. The method 2500 may include: build (2510) and demap (2515). The method 2500 may further include: demapping (2520) and/or demapping (2530).

In the establishing (2510), a subframe configuration comprising one or more OFDM symbols may be established for UL transmission. In demapping (2515), one or more PCRS REs carrying a PCRS signal may be mapped at a subcarrier frequency with respect to at least a portion of one or more OFDM symbols. The one or more PCRS REs may be periodically spaced between one or more OFDM symbols.

In demapping (2520), one or more additional PCRS REs carrying additional PCRS signals may be mapped. The one or more PCRS REs may have an odd index among OFDM symbols, and the one or more additional PCRS REs may have an even index among OFDM symbols.

In demapping (2530), one or more additional PCRS REs carrying additional PCRS signals may be demapped at additional subcarrier frequencies with respect to at least a portion of the one or more OFDM symbols. The one or more PCRS REs may be periodically spaced between one or more OFDM symbols.

Returning to fig. 26, various methods may be in accordance with various embodiments discussed herein. The method 2600 may comprise: establish (2610), demap (2615), and demap (2620). The method 2600 may further comprise: demapping (2630) and/or demapping (2640).

In establishing (2610), a subframe configuration comprising a plurality of OFDM symbols may be established for UL transmission. In demapping (2615), a first set of one or more REs carrying a primary PCRS signal may be demapped at a subcarrier frequency with respect to a first portion of one or more OFDM symbols. In demapping (2620), a second set of one or more REs carrying a secondary PCRS signal may be demapped at a subcarrier frequency with respect to a second portion of the one or more OFDM symbols. The first portion of the one or more OFDM symbols may have an even symbol index and the second portion of the one or more OFDM symbols may have an odd symbol index.

In demapping (2630), additional REs carrying DMRS may be demapped at a subcarrier frequency with respect to one or more additional OFDM symbols. The additional REs may correspond to DMRS antenna ports.

In demapping (2640), one or more additional REs carrying one or more respectively corresponding DMRSs are demapped with respect to one or more additional OFDM symbols. The subcarrier frequencies may be within a set of 48 subcarrier frequencies and one or more additional OFDM symbols may be mapped to one or more of the set of 48 subcarrier frequencies.

Fig. 27-29 illustrate methods for PCRS for a UE according to some embodiments of the present disclosure. Referring to fig. 21, methods that may be related to the UE 2130 and the hardware processing circuitry 2140 are discussed herein. While the actions in method 2700 of fig. 27, method 2800 of fig. 28, and method 2900 of fig. 29 are shown in a particular order, the order of the actions can be modified. Thus, the illustrated embodiments may be performed in a different order, and some actions may be performed in parallel. Some of the actions and/or operations listed in fig. 27, 28, and 29 are optional depending on the particular embodiment. The numbering of the acts presented is for the purpose of clarity and is not intended to dictate the order in which the acts must occur. Further, operations from the various flows may be utilized in various combinations.

Further, in some embodiments, the machine-readable storage medium may have executable instructions that when executed cause the UE 2130 and/or the hardware processing circuitry 2140 to perform operations comprising the methods of fig. 27, 28, and 29. These machine-readable storage media may include any of a variety of storage media (e.g., magnetic storage media (e.g., tape or disk), optical storage media (e.g., optical disk), electronic storage media (e.g., conventional hard disk drives, solid state drives, or flash memory-based storage media), or any other tangible or non-transitory storage media).

In some embodiments, an apparatus may include means for performing various acts and/or operations of fig. 27, 28, and 29.

Returning to fig. 27, various methods may be in accordance with various embodiments discussed herein. Method 2700 may include: setup (2710) and assignment (2715). The method 2700 may further include: mapping (2720), demapping (2730), allocating (2740), and/or allocating (2750).

In the establishing (2710), a subframe configuration of one or more OFDM symbols is included for one of UL transmission or DL transmission. In the assignment (2715): at least a portion of the one or more OFDM symbols may be allocated one or more PCRS REs at one or more subcarrier frequencies to carry PCRS signals.

In mapping (2720), one or more PCRS REs may be mapped to at least a portion of one or more OFDM symbols at one or more subcarrier frequencies. One or more OFDM symbols may be used for UL transmission.

In demapping (2730), one or more PCRS REs may be demapped from at least a portion of one or more OFDM symbols at one or more subcarrier frequencies. One or more OFDM symbols may be used for DL transmission.

In the allocating (2740), one or more DMRS REs corresponding to one or more subcarrier frequencies may be allocated. The one or more DMRS REs may carry one or more respectively corresponding DMRS signals at symbols with index 2 within the OFDM subframe and at one or more subcarrier frequencies, and the PCRS signal and the DMRS signal may be the same.

In the assigning (2750): at least a portion of the one or more OFDM symbols may be allocated one or more additional PCRS REs at one or more additional subcarrier frequencies to carry additional PCRS signals. The one or more PCRSs may correspond to a first antenna port and the one or more additional PCRSs may correspond to a second antenna port.

Returning to fig. 28, various methods may be in accordance with various embodiments discussed herein. The method 2800 may include: establishment (2810) and mapping (2815). The method 2800 may further comprise: map (2820) and/or map (2830).

In the establishing (2810), a subframe configuration comprising one or more OFDM symbols may be established for UL transmission. In the mapping (2815): one or more PCRS REs may be mapped at a subcarrier frequency with respect to at least a portion of one or more OFDM symbols to carry a PCRS signal. The one or more PCRS REs may be periodically spaced between one or more OFDM symbols.

In the mapping (2820), one or more additional PCRS REs may be mapped to carry additional PCRS signals. The one or more PCRS REs may have an odd index among OFDM symbols and the one or more additional PCRS REs have an even index among OFDM symbols.

In the mapping (2830): one or more additional PCRS REs may be mapped with respect to at least a portion of the one or more OFDM symbols at additional subcarrier frequencies to carry additional PCRS signals. The one or more PCRS REs may be periodically spaced between one or more OFDM symbols.

Returning to fig. 29, various methods may be in accordance with various embodiments discussed herein. The method 2900 may include: establishment (2910), mapping (2915), and mapping (2920). The method 2900 may further include: a map (2930) and/or a map (2940).

In establishing (2910), a subframe configuration including a plurality of OFDM symbols may be established for UL transmission. In mapping (2915): a first set of one or more REs may be mapped with respect to a first portion of one or more OFDM symbols at a subcarrier frequency to carry a primary PCRS signal. In the mapping (2920): a second set of one or more REs may be mapped at a subcarrier frequency with respect to a second portion of the one or more OFDM symbols to carry the secondary PCRS signal. The first portion of the one or more OFDM symbols may have an even symbol index and the second portion of the one or more OFDM symbols may have an odd symbol index.

In mapping (2930), additional REs may be mapped with respect to one or more additional OFDM symbols at a subcarrier frequency to carry DMRS. The additional REs may correspond to DMRS antenna ports.

In mapping (2940), one or more additional REs may be mapped with respect to one or more additional OFDM symbols to carry one or more respectively corresponding DMRSs. The subcarrier frequencies may be within a set of 48 subcarrier frequencies and one or more additional OFDM symbols may be mapped to one or more of the set of 48 subcarrier frequencies.

Fig. 30 illustrates example components of a UE device 3000 according to some embodiments of the present disclosure. In some embodiments, the UE device 3000 may include application circuitry 3002, baseband circuitry 3004, Radio Frequency (RF) circuitry 3006, Front End Module (FEM) circuitry 3008, a low power wake-up receiver (LP-WUR), and one or more antennas 3010, coupled together at least as shown. In some embodiments, the UE device 3000 may include additional elements, such as memory/storage, a display, a camera, sensors, and/or an input/output (I/O) interface.

The application circuitry 3002 can include one or more application processors. For example, the application circuitry 3002 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors (e.g., graphics processors, application processors, etc.). The processor may be coupled to and/or may include memory/storage and may be configured to: the instructions stored in the memory/storage are executed to enable various applications and/or operating systems to run on the system.

The baseband circuitry 3004 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The baseband circuitry 3004 may include one or more baseband processors and/or control logic to process baseband signals received from the receive signal path of the RF circuitry 3006 and to generate baseband signals for the transmit signal path of the RF circuitry 3006. The baseband circuitry 3004 may interface with the application circuitry 3002 for generating and processing baseband signals and controlling operation of the RF circuitry 3006. For example, in some embodiments, the baseband circuitry 3004 may include a second generation (2G) baseband processor 3004A, a third generation (3G) baseband processor 3004B, a fourth generation (4G) baseband processor 3004C, and/or other baseband processors 3004D for other existing generations, generations in development or to be developed in the future (e.g., fifth generation (5G), 6G, etc.). The baseband circuitry 3004 (e.g., one or more of the baseband processors 3004A-D) may handle various radio control functions that enable communication with one or more radio networks via the RF circuitry 3006. The radio control functions may include, but are not limited to, signal modulation/demodulation, encoding/decoding, radio frequency shifting, and the like. In some embodiments, the modulation/demodulation circuitry of the baseband circuitry 3004 may include Fast Fourier Transform (FFT), precoding, and/or constellation mapping/demapping functionality. In some embodiments, the encoding/decoding circuitry of the baseband circuitry 3004 may include convolution, tail-biting convolution, turbo, viterbi, and/or Low Density Parity Check (LDPC) encoder/decoder functionality. Embodiments of modulation/demodulation and encoder/decoder functions are not limited to these examples, and other suitable functions may be included in other embodiments.

In some embodiments, the baseband circuitry 3004 may include elements of a protocol stack, such as elements of the EUTRAN protocol, including, for example, Physical (PHY), Medium Access Control (MAC), Radio Link Control (RLC), Packet Data Convergence Protocol (PDCP), and/or RRC elements. The Central Processing Unit (CPU)3004E of the baseband circuitry 3004 may be configured to: elements of the protocol stack are run for signaling at the PHY, MAC, RLC, PDCP, and/or RRC layers. In some embodiments, the baseband circuitry may include one or more audio Digital Signal Processors (DSPs) 3004F. The audio DSP 3004F may include elements for compression/decompression and echo cancellation, and may include other suitable processing elements in other embodiments. In some embodiments, the components of the baseband circuitry may be suitably combined in a single chip, a single chipset, or disposed on the same circuit board. In some embodiments, some or all of the constituent components of the baseband circuitry 3004 and the application circuitry 3002 may be implemented together, e.g., on a system on a chip (SOC).

In some embodiments, the baseband circuitry 3004 may provide communications compatible with one or more wireless technologies. For example, in some embodiments, baseband circuitry 3004 may support communication with an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and/or other Wireless Metropolitan Area Networks (WMANs), Wireless Local Area Networks (WLANs), Wireless Personal Area Networks (WPANs). Embodiments in which the baseband circuitry 3004 is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.

The RF circuitry 3006 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry 3006 may include switches, filters, amplifiers, and the like to facilitate communication with the wireless network. The RF circuitry 3006 may include a receive signal path, which may include circuitry to down-convert RF signals received from the FEM circuitry 3008 and provide baseband signals to the baseband circuitry 3004. The RF circuitry 3006 may further include a transmit signal path, which may include circuitry to upconvert baseband signals provided by the baseband circuitry 3004 and provide an RF output signal to the FEM circuitry 3008 for transmission.

In some embodiments, the RF circuitry 3006 may include a receive signal path and a transmit signal path. The receive signal path of the RF circuit 3006 may include a mixer circuit 3006A, an amplifier circuit 3006B, and a filter circuit 3006C. The transmit signal path of the RF circuit 3006 may include a filter circuit 3006C and a mixer circuit 3006A. The RF circuitry 3006 may further include synthesizer circuitry 3006D for synthesizing frequencies used by the mixer circuitry 3006A of the receive signal path and the transmit signal path. In some embodiments, the mixer circuit 3006A of the receive signal path may be configured to: the RF signal received from the FEM circuit 3008 is down-converted based on the synthesized frequency provided by the synthesizer circuit 3006D. The amplifier circuit 3006D may be configured to: the downconverted signal is amplified, and the filter circuit 3006C may be a Low Pass Filter (LPF) or a Band Pass Filter (BPF) configured to: unwanted signals are removed from the down-converted signal to generate an output baseband signal. The output baseband signal may be provided to the baseband circuitry 3004 for further processing. In some embodiments, the output baseband signal may be a zero frequency baseband signal, but this is not required. In some embodiments, mixer circuit 3006A of the receive signal path may comprise a passive mixer, although the scope of the embodiments is not limited in this respect.

In some embodiments, the mixer circuit 3006A of the transmit signal path may be configured to: the input baseband signal is up-converted based on the synthesized frequency provided by the synthesizer circuit 3006D to generate an RF output signal for the FEM circuit 3008. The baseband signal may be provided by the baseband circuitry 3004 and may be filtered by the filter circuitry 3006C. The filter circuit 3006C may include a Low Pass Filter (LPF), although the scope of the embodiments is not limited in this respect.

In some embodiments, the mixer circuit 3006A of the receive signal path and the mixer circuit 3006A of the transmit signal path may comprise two or more mixers and may be arranged for quadrature down-conversion and/or up-conversion, respectively. In some embodiments, the mixer circuit 3006A of the receive signal path and the mixer circuit 3006A of the transmit signal path may include two or more mixers and may be arranged for image rejection (e.g., Hartley image rejection). In some embodiments, the mixer circuit 3006A and the mixer circuit 3006A of the receive signal path may be arranged for direct down-conversion and/or direct up-conversion, respectively. In some embodiments, mixer circuit 3006A of the receive signal path and mixer circuit 3006A of the transmit signal path may be configured for superheterodyne operation.

In some embodiments, the output baseband signal and the input baseband signal may be analog baseband signals, although the scope of the embodiments is not limited in this respect. In some alternative embodiments, the output baseband signal and the input baseband signal may be digital baseband signals. In these alternative embodiments, the RF circuitry 3006 may include analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuitry, and the baseband circuitry 3004 may include a digital baseband interface to communicate with the RF circuitry 3006.

In some dual-mode embodiments, separate radio IC circuits may be provided for processing signals with respect to each spectrum, although the scope of the embodiments is not limited in this respect.

In some embodiments, the synthesizer circuit 3006D may be a fractional-N synthesizer or a fractional-N/N +1 synthesizer, although the scope of the embodiments is not so limited as other types of frequency synthesizers may be suitable. For example, the synthesizer circuit 3006D may be a delta sigma synthesizer, a frequency multiplier, or a synthesizer including a phase locked loop with a frequency divider.

The synthesizer circuit 3006D may be configured to: the output frequency used by the mixer circuit 3006A of the input synthesis RF circuit 3006 is controlled based on the frequency input and the divider. In some embodiments, the synthesizer circuit 3006D may be a fractional N/N +1 synthesizer.

In some embodiments, the frequency input may be provided by a Voltage Controlled Oscillator (VCO), but this is not required. The divider control input may be provided by the baseband circuitry 3004 or the application processor 3002, depending on the desired output frequency. In some embodiments, the divider control input (e.g., N) may be determined from a look-up table based on the channel indicated by the application processor 3002.

The synthesizer circuit 3006D of the RF circuit 3006 may include a divider, a Delay Locked Loop (DLL), a multiplexer, and a phase accumulator. In some embodiments, the divider may be a dual-mode divider (DMD) and the phase accumulator may be a Digital Phase Accumulator (DPA). In some embodiments, the DMD may be configured to: the input signal is divided by N or N +1 (e.g., based on a carry) to provide a fractional division ratio. In some example embodiments, the DLL may include a set of cascaded, tunable delay elements, a phase detector, a charge pump, and a D-type flip-flop. In these embodiments, the delay elements may be configured to decompose the VCO period into Nd equal phase groups, where Nd is the number of delay elements in the delay line. In this way, the DLL provides negative feedback to help ensure that the total delay through the delay line is one VCO cycle.

In some embodiments, the synthesizer circuit 3006D may be configured to: a carrier frequency is generated as the output frequency, while in other embodiments the output frequency may be a multiple of the carrier frequency (e.g., twice the carrier frequency, four times the carrier frequency) and used in conjunction with a quadrature generator and divider circuit to generate a plurality of signals at the carrier frequency having a plurality of different phases relative to each other. In some embodiments, the output frequency may be the LO frequency (fLO). In some embodiments, the RF circuitry 3006 may include an IQ/polar converter.

The FEM circuitry 3008 may include a receive signal path, which may include circuitry configured to operate on RF signals received from the one or more antennas 3010, amplify the received signals, and provide amplified versions of the received signals to the RF circuitry 3006 for further processing. The FEM circuitry 3008 may further include a transmit signal path, which may include circuitry configured to amplify signals provided by the RF circuitry 3006 for transmission by one or more of the one or more antennas 3010.

In some embodiments, the FEM circuitry 3008 may include a TX/RX switch to switch between transmit mode and receive mode operation. The FEM circuitry may include a receive signal path and a transmit signal path. The receive signal path of the FEM circuitry may include a Low Noise Amplifier (LNA) to amplify the received RF signal and provide the amplified received RF signal as an output (e.g., to the RF circuitry 3006). The transmission signal path of the FEM circuit 3008 may include: a Power Amplifier (PA) for amplifying an input RF signal (e.g., provided by RF circuitry 3006); and one or more filters to generate RF signals for subsequent transmission (e.g., by one or more of the one or more antennas 3010).

In some embodiments, the UE 3000 includes multiple power saving mechanisms. If the UE 3000 is in RRC _ Connected state (where it is still Connected to the eNB because it is expected to receive traffic very fast), it may enter a state called discontinuous reception mode (DRX) after a period of inactivity. During this state, the device may power down for a brief interval of time and thus save power.

If there is no data traffic activity for an extended period of time, the UE 3000 may transition to an RRC _ Idel state, where it is disconnected from the network and no operation (e.g., channel quality feedback, handover, etc.) is performed. The UE 3000 enters a very low power state and it performs paging, where it again periodically wakes up to listen to the network and then powers down again. Since the device cannot receive data in this state, it should transition back to the RRC _ Connected state in order to receive data.

The additional power saving mode may allow the device to be unavailable to the network for a period longer than the paging interval (ranging from a few seconds to a few hours). During this time, the device is completely unreachable to the network and may be completely powered down. Any data sent during this time results in a large delay and it is assumed that the delay is acceptable.

Further, in various embodiments, the eNB device may include substantially similar components to one or more of the example components of UE device 3000 described herein.

It should be noted that elements of any figure herein having the same reference numbers and/or names as elements of any other figure herein can operate or function in various embodiments in a similar manner to those of the other figure (and are not limited to operating or working in this manner).

Reference in the specification to "an embodiment," "one embodiment," "some embodiments," or "other embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least some embodiments, but not necessarily all embodiments. The various appearances of "an embodiment," "one embodiment," or "some embodiments" are not necessarily all referring to the same embodiments. If the specification states a component, feature, structure, or characteristic "may", "might", or "could" be included, that particular component, feature, structure, or characteristic is not required to be included. If the specification or claim refers to "a" or "an" element, that does not mean there is only one of the element. If the specification or claims refer to "an additional" element, that does not preclude there being more than one of the additional element.

Furthermore, the particular features, structures, functions, or characteristics may be combined in any suitable manner in one or more embodiments. For example, the first and second embodiments may be combined as long as the particular features, structures, functions, or characteristics associated with the embodiments are not mutually exclusive.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments. The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims.

In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the presented figures, to simplify illustration and discussion, and not to obscure the disclosure. Further, arrangements may be shown in block diagram form in order to avoid obscuring the disclosure, and also in view of the fact that specifics with respect to implementation of such block diagram arrangements are highly dependent upon the platform within which the present disclosure is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be understood by one skilled in the art that the disclosure may be practiced without, or with variation of, these specific details. The description is thus to be regarded as illustrative instead of limiting.

The following examples pertain to other embodiments. The details of the examples may be used anywhere in one or more embodiments. All optional features of the apparatus described herein may also be implemented with respect to the method or process.

Example 1 provides an apparatus of an evolved node b (enb) operable to communicate with a User Equipment (UE) on a wireless network, comprising: one or more processors configured to: establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for one of Uplink (UL) transmission or Downlink (DL) transmission; and allocating one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) for at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies to carry PCRS signals.

In example 2, the apparatus of example 1, wherein the one or more OFDM symbols are for data channel transmission.

In example 3, the apparatus of one of examples 1 or 2, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 4, the apparatus of any of examples 1 to 3, wherein the one or more subcarrier frequencies are substantially evenly distributed across the set of 48 subcarrier frequencies.

In example 5, the apparatus of any of examples 1 to 4, wherein the one or more subcarrier frequencies are distributed substantially around a center of the set of 48 subcarrier frequencies.

In example 6, the apparatus of any one of examples 1 to 5, wherein the one or more processors are to: demapping the one or more PCRS REs from at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for UL transmission.

In example 7, the apparatus of any one of examples 1 to 6, wherein the one or more processors are to: mapping the one or more PCRS REs to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for DL transmission.

In example 8, the apparatus of any one of examples 1 to 7, wherein the one or more processors are to: allocating one or more demodulation reference signal (DMRS) REs corresponding to the one or more subcarrier frequencies, wherein the one or more DMRS REs carry one or more respectively corresponding DMRS signals at symbols indexed 2 within the OFDM subframe and at the one or more subcarrier frequencies; and wherein the PCRS signal is the same as the DMRS signal.

In example 9, the apparatus of any one of examples 1 to 8, wherein the one or more processors are to: allocating one or more additional PCRS REs for at least a portion of the one or more OFDM symbols at one or more additional subcarrier frequencies to carry additional PCRS signals, wherein the one or more PCRS correspond to a first antenna port; and wherein the one or more additional PCRSs correspond to a second antenna port.

In example 10, the apparatus of any one of examples 1 to 9, wherein the one or more PCRS REs include a first set of PCRS REs at a first subcarrier frequency and corresponding to a first antenna port, and wherein the one or more PCRS REs include a second set of PCRS REs at a second subcarrier frequency and corresponding to a second antenna port.

In example 11, the apparatus of example 10, wherein the first subcarrier frequency and the second subcarrier frequency are within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency is spaced from the first subcarrier frequency by one of 14 subcarrier frequencies or 15 subcarrier frequencies.

In example 12, the apparatus of one of examples 10 or 11, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies.

In example 13, the apparatus of any one of examples 10 to 12, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies.

In example 14, the apparatus of any one of examples 10 to 13, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 32 within the set of subcarrier frequencies.

In example 15, the apparatus of any of examples 55 to 14, wherein the one or more PCRS REs include a third set of PCRS REs at a third subcarrier frequency and corresponding to a third antenna port.

In example 16, the apparatus of example 15, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 40 within the set of subcarrier frequencies.

In example 17, the apparatus of one of examples 15 or 16, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 36 within the set of subcarrier frequencies.

In example 18, the apparatus of any of examples 1 to 17, comprising transceiver circuitry to generate the transmission and to process the transmission.

Example 19 provides an evolved node b (eNB) device comprising an application processor, a memory, one or more antenna ports, and an interface to allow the application processor to communicate with another device, the eNB device comprising the apparatus of any of examples 1 to 18.

Example 20 provides a method comprising: establishing a subframe configuration for an evolved node B (eNB) comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for one of Uplink (UL) transmission or Downlink (DL) transmission; and allocating one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) for at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies to carry PCRS signals.

In example 21, the method of example 20, wherein the one or more OFDM symbols are for data channel transmission.

In example 22, the method of one of examples 20 or 21, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 23, the method of any of examples 20 to 22, wherein the one or more subcarrier frequencies are substantially evenly distributed across the set of 48 subcarrier frequencies.

In example 24, the method of any of examples 20 to 23, wherein the one or more subcarrier frequencies are distributed substantially around a center of the set of 48 subcarrier frequencies.

In example 25, the method of any of examples 20 to 24, comprising: demapping the one or more PCRS REs from at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for UL transmission.

In example 26, the method of any of examples 20 to 25, comprising: mapping the one or more PCRS REs to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for DL transmission.

In example 27, the method of any of examples 20 to 26, comprising: allocating one or more demodulation reference signal (DMRS) REs corresponding to the one or more subcarrier frequencies, wherein the one or more DMRS REs carry one or more respectively corresponding DMRS signals at symbols indexed 2 within the OFDM subframe and at the one or more subcarrier frequencies; and wherein the PCRS signal is the same as the DMRS signal.

In example 28, the method of any of examples 20 to 27, comprising: allocating one or more additional PCRS REs for at least a portion of the one or more OFDM symbols at one or more additional subcarrier frequencies to carry additional PCRS signals, wherein the one or more PCRS correspond to a first antenna port; and wherein the one or more additional PCRSs correspond to a second antenna port.

In example 29, the method of any of examples 20 to 28, wherein the one or more PCRS REs include a first set of PCRS REs at a first subcarrier frequency and corresponding to a first antenna port, and wherein the one or more PCRS REs include a second set of PCRS REs at a second subcarrier frequency and corresponding to a second antenna port.

In example 30, the method of example 29, wherein the first subcarrier frequency and the second subcarrier frequency are within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency is spaced from the first subcarrier frequency by one of 14 subcarrier frequencies or 15 subcarrier frequencies.

In example 31, the method of one of examples 29 or 30, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies.

In example 32, the method of any of examples 29 to 31, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies.

In example 33, the method of any one of examples 29 to 32, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 32 within the set of subcarrier frequencies.

In example 34, the method of any of examples 20 to 33, wherein the one or more PCRS REs include a third set of PCRS REs at a third subcarrier frequency and corresponding to a third antenna port.

In example 35, the method of example 34, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 40 within the set of subcarrier frequencies.

In example 36, the method of one of examples 34 or 35, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 36 within the set of subcarrier frequencies.

Example 37 provides a machine-readable storage medium having stored thereon machine-executable instructions that, when executed, cause one or more processors to perform the method of any of examples 20 to 36.

Example 38 provides an apparatus of an evolved node b (enb) operable to communicate with a User Equipment (UE) on a wireless network, comprising: means for establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for one of Uplink (UL) transmission or Downlink (DL) transmission; and means for allocating one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) for at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies to carry PCRS signals.

In example 39, the apparatus of example 38, wherein the one or more OFDM symbols are for data channel transmission.

In example 40, the apparatus of one of examples 38 or 39, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 41, the apparatus of any one of examples 38 to 40, wherein the one or more subcarrier frequencies are substantially evenly distributed across the set of 48 subcarrier frequencies.

In example 42, the apparatus of any one of examples 38 to 41, wherein the one or more subcarrier frequencies are distributed substantially around a center of the set of 48 subcarrier frequencies.

In example 43, the apparatus of any one of examples 38 to 42, comprising: means for demapping the one or more PCRS REs from at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for UL transmission.

In example 44, the apparatus of any one of examples 38 to 43, comprising: means for mapping the one or more PCRS REs to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for DL transmission.

In example 45, the apparatus of any one of examples 38 to 44, comprising: means for allocating one or more demodulation reference signal (DMRS) REs corresponding to the one or more subcarrier frequencies, wherein the one or more DMRS REs carry one or more respectively corresponding DMRS signals at symbols indexed 2 within the OFDM subframe and at the one or more subcarrier frequencies; and wherein the PCRS signal is the same as the DMRS signal.

In example 46, the apparatus of any one of examples 38 to 45, comprising: means for allocating one or more additional PCRS REs for at least a portion of the one or more OFDM symbols at one or more additional subcarrier frequencies to carry additional PCRS signals, wherein the one or more PCRS correspond to a first antenna port; and wherein the one or more additional PCRSs correspond to a second antenna port.

In example 47, the apparatus of any one of examples 38 to 46, wherein the one or more PCRS REs include a first set of PCRS REs at a first subcarrier frequency and corresponding to a first antenna port, and wherein the one or more PCRS REs include a second set of PCRS REs at a second subcarrier frequency and corresponding to a second antenna port.

In example 48, the apparatus of example 47, wherein the first subcarrier frequency and the second subcarrier frequency are within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency is spaced from the first subcarrier frequency by one of 14 subcarrier frequencies or 15 subcarrier frequencies.

In example 49, the apparatus of one of examples 47 or 48, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies.

In example 50, the apparatus of any one of examples 47-49, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies.

In example 51, the apparatus of any one of examples 47 to 50, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 32 within the set of subcarrier frequencies.

In example 52, the apparatus of any one of examples 38 to 51, wherein the one or more PCRS REs include a third set of PCRS REs at a third subcarrier frequency and corresponding to a third antenna port.

In example 53, the apparatus of example 52, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 40 within the set of subcarrier frequencies.

In example 54, the apparatus of one of examples 52 or 53, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 36 within the set of subcarrier frequencies.

Example 55 provides a machine-readable storage medium having machine-executable instructions that, when executed, cause one or more processors of an evolved node b (enb) to perform operations comprising: establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for one of Uplink (UL) transmission or Downlink (DL) transmission; and allocating one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) for at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies to carry PCRS signals.

In example 56, the machine-readable storage medium of example 55, wherein the one or more OFDM symbols are for data channel transmission.

In example 57, the machine-readable storage medium of one of examples 55 or 56, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 58, the machine-readable storage medium of any of examples 55 to 57, wherein the one or more subcarrier frequencies are substantially evenly distributed across the set of 48 subcarrier frequencies.

In example 59, the machine-readable storage medium of any of examples 55 to 58, wherein the one or more subcarrier frequencies are distributed substantially around a center of the set of 48 subcarrier frequencies.

In example 60, the machine-readable storage medium of any of examples 55 to 59, the operations comprising: demapping the one or more PCRS REs from at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for UL transmission.

In example 61, the machine-readable storage medium of any of examples 55 to 60, the operations comprising: mapping the one or more PCRS REs to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for DL transmission.

In example 62, the machine-readable storage medium of any of examples 55 to 61, the operations comprising: allocating one or more demodulation reference signal (DMRS) REs corresponding to the one or more subcarrier frequencies, wherein the one or more DMRS REs carry one or more respectively corresponding DMRS signals at symbols indexed 2 within the OFDM subframe and at the one or more subcarrier frequencies; and wherein the PCRS signal is the same as the DMRS signal.

In example 63, the machine-readable storage medium of any of examples 55 to 62, the operations comprising: allocating one or more additional PCRS REs for at least a portion of the one or more OFDM symbols at one or more additional subcarrier frequencies to carry additional PCRS signals, wherein the one or more PCRS correspond to a first antenna port; and wherein the one or more additional PCRSs correspond to a second antenna port.

In example 64, the machine-readable storage medium of any of examples 55 to 63, wherein the one or more PCRS REs include a first set of PCRS REs at a first subcarrier frequency and corresponding to a first antenna port, and wherein the one or more PCRS REs include a second set of PCRS REs at a second subcarrier frequency and corresponding to a second antenna port.

In example 65, the machine-readable storage medium of example 64, wherein the first subcarrier frequency and the second subcarrier frequency are within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency is spaced from the first subcarrier frequency by one of 14 subcarrier frequencies or 15 subcarrier frequencies.

In example 66, the machine-readable storage medium of one of examples 64 or 65, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies.

In example 67, the machine-readable storage medium of any of examples 64 to 66, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies.

In example 68, the machine-readable storage medium of any of examples 64 to 67, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 32 within the set of subcarrier frequencies.

In example 69, the machine-readable storage medium of any of examples 55 to 68, wherein the one or more PCRS REs include a third set of PCRS REs at a third subcarrier frequency and corresponding to a third antenna port.

In example 70, the machine-readable storage medium of example 69, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 40 within the set of subcarrier frequencies.

In example 71, the machine-readable storage medium of one of examples 69 or 70, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 36 within the set of subcarrier frequencies.

Example 72 provides an apparatus of a User Equipment (UE) operable to communicate with an evolved node b (enb) on a wireless network, comprising: one or more processors configured to: establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for one of Uplink (UL) transmission or Downlink (DL) transmission; and allocating one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) for at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies to carry PCRS signals.

In example 73, the apparatus of example 72, wherein the one or more OFDM symbols are for data channel transmission.

In example 74, the apparatus of one of examples 72 or 73, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 75, the apparatus of any one of examples 72 to 74, wherein the one or more subcarrier frequencies are substantially evenly distributed across the set of 48 subcarrier frequencies.

In example 76, the apparatus of any one of examples 72 to 75, wherein the one or more subcarrier frequencies are distributed substantially around a center of the set of 48 subcarrier frequencies.

In example 77, the apparatus of any one of examples 72 to 76, wherein the one or more processors are to: mapping the one or more PCRS REs to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for UL transmission.

In example 78, the apparatus of any one of examples 72 to 77, wherein the one or more processors are to: demapping the one or more PCRS REs from at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for DL transmission.

In example 79, the apparatus of any one of examples 72 to 78, wherein the one or more processors are to: allocating one or more demodulation reference signal (DMRS) REs corresponding to the one or more subcarrier frequencies, wherein the one or more DMRS REs carry one or more respectively corresponding DMRS signals at symbols indexed 2 within the OFDM subframe and at the one or more subcarrier frequencies; and wherein the PCRS signal is the same as the DMRS signal.

In example 80, the apparatus of any one of examples 72 to 79, wherein the one or more processors are to: allocating one or more additional PCRS REs for at least a portion of the one or more OFDM symbols at one or more additional subcarrier frequencies to carry additional PCRS signals, wherein the one or more PCRS correspond to a first antenna port; and wherein the one or more additional PCRSs correspond to a second antenna port.

In example 81, the apparatus of any one of examples 72 to 80, wherein the one or more PCRS REs include a first set of PCRS REs at a first subcarrier frequency and corresponding to a first antenna port, and wherein the one or more PCRS REs include a second set of PCRS REs at a second subcarrier frequency and corresponding to a second antenna port.

In example 82, the apparatus of example 81, wherein the first subcarrier frequency and the second subcarrier frequency are within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency is spaced from the first subcarrier frequency by one of 14 subcarrier frequencies or 15 subcarrier frequencies.

In example 83, the apparatus of one of examples 81 or 82, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies.

In example 84, the apparatus of any one of examples 81 to 83, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies.

In example 85, the apparatus of any one of examples 81 to 84, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 32 within the set of subcarrier frequencies.

In example 86, the apparatus of any one of examples 72 to 85, wherein the one or more PCRS REs include a third set of PCRS REs at a third subcarrier frequency and corresponding to a third antenna port.

In example 87, the apparatus of example 86, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 40 within the set of subcarrier frequencies.

In example 88, the apparatus of one of examples 86 or 87, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 36 within the set of subcarrier frequencies.

In example 89, the apparatus of any one of examples 72 to 88, comprising transceiver circuitry to generate the transmission and to process the transmission.

Example 90 provides a User Equipment (UE) device comprising an application processor, a memory, one or more antennas, a wireless interface to allow the application processor to communicate with another device, and a touchscreen display, the UE device comprising the apparatus of any of examples 72-89.

Example 91 provides a method, comprising: establishing, for a User Equipment (UE), a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for one of Uplink (UL) transmission or Downlink (DL) transmission; and allocating one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) for at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies to carry PCRS signals.

In example 92, the method of example 91, wherein the one or more OFDM symbols are for data channel transmission.

In example 93, the method of one of examples 91 or 92, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 94, the method of any of examples 91 to 93, wherein the one or more subcarrier frequencies are substantially evenly distributed across the set of 48 subcarrier frequencies.

In example 95, the method of any of examples 91 to 94, wherein the one or more subcarrier frequencies are distributed substantially around a center of the set of 48 subcarrier frequencies.

In example 96, the method of any one of examples 91 to 95, comprising: mapping the one or more PCRS REs to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for UL transmission.

In example 97, the method of any of examples 91 to 96, comprising: demapping the one or more PCRS REs from at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for DL transmission.

In example 98, the method of any of examples 91 to 97, comprising: allocating one or more demodulation reference signal (DMRS) REs corresponding to the one or more subcarrier frequencies, wherein the one or more DMRS REs carry one or more respectively corresponding DMRS signals at symbols indexed 2 within the OFDM subframe and at the one or more subcarrier frequencies; and wherein the PCRS signal is the same as the DMRS signal.

In example 99, the method of any of examples 91 to 98, comprising: allocating one or more additional PCRS REs for at least a portion of the one or more OFDM symbols at one or more additional subcarrier frequencies to carry additional PCRS signals, wherein the one or more PCRS correspond to a first antenna port; and wherein the one or more additional PCRSs correspond to a second antenna port.

In example 100, the method of any of examples 91 to 99, wherein the one or more PCRS REs include a first set of PCRS REs at a first subcarrier frequency and corresponding to a first antenna port, and wherein the one or more PCRS REs include a second set of PCRS REs at a second subcarrier frequency and corresponding to a second antenna port.

In example 101, the method of example 100, wherein the first subcarrier frequency and the second subcarrier frequency are within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency is spaced from the first subcarrier frequency by one of 14 subcarrier frequencies or 15 subcarrier frequencies.

In example 102, the method of one of examples 100 or 101, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies.

In example 103, the method of any of examples 100 to 102, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies.

In example 104, the method of any of examples 100 to 103, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 32 within the set of subcarrier frequencies.

In example 105, the method of any one of examples 91 to 104, wherein the one or more PCRS REs include a third set of PCRS REs at a third subcarrier frequency and corresponding to a third antenna port.

In example 106, the method of example 105, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 40 within the set of subcarrier frequencies.

In example 107, the method of one of examples 105 or 106, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 36 within the set of subcarrier frequencies.

Example 108 provides a machine-readable storage medium having stored thereon machine-executable instructions that, when executed, cause one or more processors to perform the method of any of examples 91 to 107.

Example 109 provides an apparatus of a User Equipment (UE) operable to communicate with an evolved node b (enb) on a wireless network, comprising: means for establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for one of Uplink (UL) transmission or Downlink (DL) transmission; and means for allocating one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) for at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies to carry PCRS signals.

In example 110, the apparatus of example 109, wherein the one or more OFDM symbols are for data channel transmission.

In example 111, the apparatus of one of examples 109 or 110, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 112, the apparatus of any one of examples 109 to 111, wherein the one or more subcarrier frequencies are substantially evenly distributed across the set of 48 subcarrier frequencies.

In example 113, the apparatus of any of examples 109 to 112, wherein the one or more subcarrier frequencies are distributed substantially around a center of the set of 48 subcarrier frequencies.

In example 114, the apparatus of any one of examples 109 to 113, comprising: means for mapping the one or more PCRS REs to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for UL transmission.

In example 115, the apparatus of any one of examples 109 to 114, comprising: means for demapping the one or more PCRS REs from at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for DL transmission.

In example 116, the apparatus of any one of examples 109 to 115, comprising: means for allocating one or more demodulation reference signal (DMRS) REs corresponding to the one or more subcarrier frequencies, wherein the one or more DMRS REs carry one or more respectively corresponding DMRS signals at symbols indexed 2 within the OFDM subframe and at the one or more subcarrier frequencies; and wherein the PCRS signal is the same as the DMRS signal.

In example 117, the apparatus of any one of examples 109 to 133, comprising: means for allocating one or more additional PCRS REs for at least a portion of the one or more OFDM symbols at one or more additional subcarrier frequencies to carry additional PCRS signals, wherein the one or more PCRS correspond to a first antenna port; and wherein the one or more additional PCRSs correspond to a second antenna port.

In example 118, the apparatus of any one of examples 109 to 117, wherein the one or more PCRS REs include a first set of PCRS REs at a first subcarrier frequency and corresponding to a first antenna port, and wherein the one or more PCRS REs include a second set of PCRS REs at a second subcarrier frequency and corresponding to a second antenna port.

In example 119, the apparatus of example 118, wherein the first subcarrier frequency and the second subcarrier frequency are within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency is spaced from the first subcarrier frequency by one of 14 subcarrier frequencies or 15 subcarrier frequencies.

In example 120, the apparatus of one of examples 118 or 119, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies.

In example 121, the apparatus of any one of examples 118 to 120, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies.

In example 122, the apparatus of any one of examples 118 to 121, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 32 within the set of subcarrier frequencies.

In example 123, the apparatus of any of examples 109 to 122, wherein the one or more PCRS REs include a third set of PCRS REs at a third subcarrier frequency and corresponding to a third antenna port.

In example 124, the apparatus of example 123, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 40 within the set of subcarrier frequencies.

In example 125, the apparatus of one of examples 123 or 124, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 36 within the set of subcarrier frequencies.

Example 126 provides a machine-readable storage medium having machine-executable instructions that, when executed, cause one or more processors of a User Equipment (UE) to perform operations comprising: establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for one of Uplink (UL) transmission or Downlink (DL) transmission; and allocating one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) for at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies to carry PCRS signals.

In example 127, the machine-readable storage medium of example 126, wherein the one or more OFDM symbols are for data channel transmission.

In example 128, the machine-readable storage medium of one of examples 126 or 127, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 129, the machine-readable storage medium of any of examples 126 to 128, wherein the one or more subcarrier frequencies are substantially evenly distributed across the set of 48 subcarrier frequencies.

In example 130, the machine-readable storage medium of any of examples 126 to 129, wherein the one or more subcarrier frequencies are distributed substantially around a center of the set of 48 subcarrier frequencies.

In example 131, the machine-readable storage medium of any of examples 126 to 130, the operations comprising: mapping the one or more PCRS REs to at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for UL transmission.

In example 132, the machine-readable storage medium of any of examples 126 to 131, the operations comprising: demapping the one or more PCRS REs from at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies, wherein the one or more OFDM symbols are for DL transmission.

In example 133, the machine-readable storage medium of any of examples 126 to 132, the operations comprising: allocating one or more demodulation reference signal (DMRS) REs corresponding to the one or more subcarrier frequencies, wherein the one or more DMRS REs carry one or more respectively corresponding DMRS signals at symbols indexed 2 within the OFDM subframe and at the one or more subcarrier frequencies; and wherein the PCRS signal is the same as the DMRS signal.

In example 134, the machine-readable storage medium of any of examples 126 to 133, the operations comprising: allocating one or more additional PCRS REs for at least a portion of the one or more OFDM symbols at one or more additional subcarrier frequencies to carry additional PCRS signals, wherein the one or more PCRS correspond to a first antenna port; and wherein the one or more additional PCRSs correspond to a second antenna port.

In example 135, the machine-readable storage medium of any of examples 126 to 134, wherein the one or more PCRS REs include a first set of PCRS REs at a first subcarrier frequency and corresponding to a first antenna port, and wherein the one or more PCRS REs include a second set of PCRS REs at a second subcarrier frequency and corresponding to a second antenna port.

In example 136, the machine-readable storage medium of example 135, wherein the first subcarrier frequency and the second subcarrier frequency are within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency is spaced from the first subcarrier frequency by one of 14 subcarrier frequencies or 15 subcarrier frequencies.

In example 137, the machine-readable storage medium of one of examples 135 or 136, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies.

In example 138, the machine-readable storage medium of any of examples 135 to 137, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies.

In example 139, the machine-readable storage medium of any of examples 135 to 138, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; and wherein the second subcarrier frequency has an index 32 within the set of subcarrier frequencies.

In example 140, the machine-readable storage medium of any of examples 126 to 139, wherein the one or more PCRS REs include a third set of PCRS REs at a third subcarrier frequency and corresponding to a third antenna port.

In example 141, the machine-readable storage medium of example 140, wherein the first subcarrier frequency has an index of 16 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 31 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index 40 within the set of subcarrier frequencies.

In example 142, the machine-readable storage medium of one of examples 140 or 141, wherein the first subcarrier frequency has an index of 23 within a set of subcarrier frequencies having indices from 0 to 47; wherein the second subcarrier frequency has an index 24 within the set of subcarrier frequencies; and wherein the third subcarrier frequency has an index of 36 within the set of subcarrier frequencies.

Example 143 provides an apparatus of an evolved node b (enb) operable to communicate with a User Equipment (UE) on a wireless network, comprising: one or more processors configured to: establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; and demapping one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) carrying a PCRS signal with respect to at least a portion of the one or more OFDM symbols at a subcarrier frequency, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 144, the apparatus of example 143, wherein the one or more PCRS REs have an odd index among the OFDM symbols.

In example 145, the apparatus of one of examples 143 or 144, wherein the one or more PCRS REs have even indices among the OFDM symbols.

In example 146, the apparatus of any one of examples 143 to 145, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 147, the apparatus of any of examples 143 to 146, wherein the one or more processors are to: demapping one or more additional PCRS REs carrying additional PCRS signals, wherein the one or more PCRS REs have odd indices among the OFDM symbols; and wherein the one or more additional PCRS REs have an even index among the OFDM symbols.

In example 148, the apparatus of any one of examples 143 to 147, wherein the one or more processors are to: demapping one or more additional PCRS REs carrying additional PCRS signals with respect to at least a portion of the one or more OFDM symbols at an additional subcarrier frequency, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 149, the apparatus of example 148, wherein the subcarrier frequencies have an index X within a first set of N subcarrier frequencies having indices from 0 to N-1; and wherein the additional subcarrier frequency has an index X within a second set of N subcarrier frequencies having indices from 0 to N-1, the second set of N subcarrier frequencies adjacent to the first set of N subcarrier frequencies.

In example 150, the apparatus of example 149, wherein the one or more PCRS REs have an even index among the OFDM symbols; and wherein the one or more PCRS REs have an odd index among the OFDM symbols.

In example 151, the apparatus of any one of examples 143 to 150, comprising transceiver circuitry to generate the transmission and process the transmission.

Example 152 provides an evolved node b (eNB) device comprising an application processor, a memory, one or more antenna ports, and an interface to allow the application processor to communicate with another device, the eNB device comprising the apparatus of any of examples 143 to 151.

Example 153 provides a method, comprising: establishing a subframe configuration for an evolved node B (eNB) comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; and demapping one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) carrying a PCRS signal with respect to at least a portion of the one or more OFDM symbols at a subcarrier frequency, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 154, the method of example 153, wherein the one or more PCRS REs have an odd index among the OFDM symbols.

In example 155, the method of one of examples 153 or 154, wherein the one or more PCRS REs have an even index among the OFDM symbols.

In example 156, the method of any of examples 153 to 155, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 157, the method of any of examples 153 to 156, comprising: demapping one or more additional PCRS REs carrying additional PCRS signals, wherein the one or more PCRS REs have odd indices among the OFDM symbols; and wherein the one or more additional PCRS REs have an even index among the OFDM symbols.

In example 158, the method of any of examples 153 to 157, comprising: demapping one or more additional PCRS REs carrying additional PCRS signals with respect to at least a portion of the one or more OFDM symbols at an additional subcarrier frequency, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 159, the method of example 158, wherein the subcarrier frequency has an index X within a first set of N subcarrier frequencies having indices from 0 to N-1; and wherein the additional subcarrier frequency has an index X within a second set of N subcarrier frequencies having indices from 0 to N-1, the second set of N subcarrier frequencies adjacent to the first set of N subcarrier frequencies.

In example 160, the method of example 159, wherein the one or more PCRS REs have an even index among the OFDM symbols; and wherein the one or more PCRS REs have an odd index among the OFDM symbols.

Example 161 provides a machine-readable storage medium having stored thereon machine-executable instructions that, when executed, cause one or more processors to perform the method of any of examples 153 to 160.

Example 162 provides an apparatus of an evolved node b (enb) operable to communicate with a User Equipment (UE) on a wireless network, comprising: means for establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; and means for demapping, at a subcarrier frequency, one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) carrying a PCRS signal with respect to at least a portion of the one or more OFDM symbols, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 163, the apparatus of example 162, wherein the one or more PCRS REs have an odd index among the OFDM symbols.

In example 164, the apparatus of one of examples 162 or 163, wherein the one or more PCRS REs have an even index among the OFDM symbols.

In example 165, the apparatus of any one of examples 162 to 164, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 166, the apparatus of any of examples 162 to 165, comprising: means for demapping one or more additional PCRS REs carrying additional PCRS signals, wherein the one or more PCRS REs have an odd index among the OFDM symbols; and wherein the one or more additional PCRS REs have an even index among the OFDM symbols.

In example 167, the apparatus of any of examples 162 to 166, comprising: means for demapping one or more additional PCRS REs carrying additional PCRS signals at an additional subcarrier frequency with respect to at least a portion of the one or more OFDM symbols, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 168, the apparatus of example 167, wherein the subcarrier frequency has an index X within a first set of N subcarrier frequencies having indices from 0 to N-1; and wherein the additional subcarrier frequency has an index X within a second set of N subcarrier frequencies having indices from 0 to N-1, the second set of N subcarrier frequencies adjacent to the first set of N subcarrier frequencies.

In example 169, the apparatus of example 168, wherein the one or more PCRS REs have even indices among the OFDM symbols; and wherein the one or more PCRS REs have an odd index among the OFDM symbols.

Example 170 provides a machine-readable storage medium having machine-executable instructions that, when executed, cause one or more processors of an evolved node b (enb) to perform operations comprising: establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; and demapping one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) carrying a PCRS signal with respect to at least a portion of the one or more OFDM symbols at a subcarrier frequency, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 171, the machine-readable storage medium of example 170, wherein the one or more PCRS REs have an odd index among the OFDM symbols.

In example 172, the machine-readable storage medium of one of examples 170 or 171, wherein the one or more PCRS REs have an even index among the OFDM symbols.

In example 173, the machine-readable storage medium of any of examples 170 to 172, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 174, the machine-readable storage medium of any of examples 170 to 173, the operations comprising: demapping one or more additional PCRS REs carrying additional PCRS signals, wherein the one or more PCRS REs have odd indices among the OFDM symbols; and wherein the one or more additional PCRS REs have an even index among the OFDM symbols.

In example 175, the machine-readable storage medium of any of examples 170 to 174, the operations comprising: demapping one or more additional PCRS REs carrying additional PCRS signals with respect to at least a portion of the one or more OFDM symbols at an additional subcarrier frequency, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 176, the machine-readable storage medium of example 175, wherein the subcarrier frequencies have an index X within a first set of N subcarrier frequencies having indices from 0 to N-1; and wherein the additional subcarrier frequencies have X indices within a second set of N subcarrier frequencies having indices from 0 to N-1, the second set of N subcarrier frequencies adjacent to the first set of N subcarrier frequencies.

In example 177, the machine-readable storage medium of example 176, wherein the one or more PCRS REs have an even index among the OFDM symbols; and wherein the one or more PCRS REs have an odd index among the OFDM symbols.

Example 178 provides an apparatus of a User Equipment (UE) operable to communicate with an evolved node b (enb) on a wireless network, comprising: one or more processors configured to: establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; and mapping one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) with respect to at least a portion of the one or more OFDM symbols at a subcarrier frequency to carry a PCRS signal, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 179, the apparatus of example 178, wherein the one or more PCRS REs have odd indices among the OFDM symbols.

In example 180, the apparatus of one of examples 178 or 179, wherein the one or more PCRS REs have an even index among the OFDM symbols.

In example 181, the apparatus of any of examples 178 to 180, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 182, the apparatus of any of examples 178-181, wherein the one or more processors are to: mapping one or more additional PCRS REs to carry additional PCRS signals, wherein the one or more PCRS REs have odd indices among the OFDM symbols; and wherein the one or more additional PCRS REs have an even index among the OFDM symbols.

In example 183, the apparatus of any one of examples 178 to 182, wherein the one or more processors are to: mapping one or more additional PCRS REs with respect to at least a portion of the one or more OFDM symbols at an additional subcarrier frequency to carry additional PCRS signals, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 184, the apparatus of example 183, wherein the subcarrier frequencies have an index X within a first set of N subcarrier frequencies having indices from 0 to N-1; and wherein the additional subcarrier frequency has an index X within a second set of N subcarrier frequencies having indices from 0 to N-1, the second set of N subcarrier frequencies adjacent to the first set of N subcarrier frequencies.

In example 185, the apparatus of example 184, wherein the one or more PCRS REs have even indices among the OFDM symbols; and wherein the one or more PCRS REs have an odd index among the OFDM symbols.

In example 186, the apparatus of any of examples 178 to 185, comprising transceiver circuitry to generate the transmission and process the transmission.

Example 187 provides a User Equipment (UE) device comprising an application processor, a memory, one or more antennas, a wireless interface to allow the application processor to communicate with another device, and a touchscreen display, the UE device comprising the apparatus of any of examples 178-186.

Example 188 provides a method, comprising: establishing a subframe configuration for a User Equipment (UE) comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; and mapping one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) with respect to at least a portion of the one or more OFDM symbols at a subcarrier frequency to carry a PCRS signal, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 189, the method of example 188, wherein the one or more PCRS REs have an odd index among the OFDM symbols.

In example 190, the method of one of examples 188 or 189, wherein the one or more PCRS REs have an even index among the OFDM symbols.

In example 191, the method of any one of examples 188 to 190, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 192, the method of any of examples 188 to 191, comprising: mapping one or more additional PCRS REs to carry additional PCRS signals, wherein the one or more PCRS REs have odd indices among the OFDM symbols; and wherein the one or more additional PCRS REs have an even index among the OFDM symbols.

In example 193, the method of any of examples 188 to 192, comprising: mapping one or more additional PCRS REs with respect to at least a portion of the one or more OFDM symbols at an additional subcarrier frequency to carry additional PCRS signals, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 194, the method of example 193, wherein the subcarrier frequencies have an index X within a first set of N subcarrier frequencies having indices from 0 to N-1; and wherein the additional subcarrier frequency has an index X within a second set of N subcarrier frequencies having indices from 0 to N-1, the second set of N subcarrier frequencies adjacent to the first set of N subcarrier frequencies.

In example 195, the method of example 194, wherein the one or more PCRS REs have an even index among the OFDM symbols; and wherein the one or more PCRS REs have an odd index among the OFDM symbols.

Example 196 provides a machine-readable storage medium having stored thereon machine-executable instructions that, when executed, cause one or more processors to perform the method of any of examples 188-195.

Example 197 provides an apparatus of a User Equipment (UE) operable to communicate with an evolved node b (enb) on a wireless network, comprising: means for establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; and means for mapping one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) with respect to at least a portion of the one or more OFDM symbols at a subcarrier frequency to carry a PCRS signal, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 198, the apparatus of example 197, wherein the one or more PCRS REs have an odd index among the OFDM symbols.

In example 199, the apparatus of one of examples 197 or 198, wherein the one or more PCRS REs have even indices among the OFDM symbols.

In example 200, the apparatus of any of examples 197 to 199, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 201, the apparatus of any of examples 197 to 200, comprising: means for mapping one or more additional PCRS REs to carry additional PCRS signals, wherein the one or more PCRS REs have an odd index among the OFDM symbols; and wherein the one or more additional PCRS REs have an even index among the OFDM symbols.

In example 202, the apparatus of any of examples 197 to 201, comprising: means for mapping one or more additional PCRS REs with respect to at least a portion of the one or more OFDM symbols at additional subcarrier frequencies to carry additional PCRS signals, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 203, the apparatus of example 202, wherein the subcarrier frequencies have an index X within a first set of N subcarrier frequencies having indices from 0 to N-1; and wherein the additional subcarrier frequency has an index X within a second set of N subcarrier frequencies having indices from 0 to N-1, the second set of N subcarrier frequencies adjacent to the first set of N subcarrier frequencies.

In example 204, the apparatus of example 203, wherein the one or more PCRS REs have even indices among the OFDM symbols; and wherein the one or more PCRS REs have an odd index among the OFDM symbols.

Example 205 provides a machine-readable storage medium having machine-executable instructions that, when executed, cause one or more processors of a User Equipment (UE) to perform operations comprising: establishing a subframe configuration comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; and mapping one or more Phase Compensated Reference Signal (PCRS) Resource Elements (REs) with respect to at least a portion of the one or more OFDM symbols at a subcarrier frequency to carry a PCRS signal, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 206, the machine-readable storage medium of example 205, wherein the one or more PCRS REs have an odd index among the OFDM symbols.

In example 207, the machine-readable storage medium of one of examples 205 or 206, wherein the one or more PCRS REs have even indices among the OFDM symbols.

In example 208, the machine-readable storage medium of any of examples 205 to 207, wherein the one or more OFDM symbols have indices from 3 to 13 within an OFDM subframe that includes symbols having indices from 0 to 13.

In example 209, the machine-readable storage medium of any of examples 205 to 208, the operations comprising: mapping one or more additional PCRS REs to carry additional PCRS signals, wherein the one or more PCRS REs have odd indices among the OFDM symbols; and wherein the one or more additional PCRS REs have an even index among the OFDM symbols.

In example 210, the machine-readable storage medium of any of examples 205 to 209, the operations comprising: mapping one or more additional PCRS REs with respect to at least a portion of the one or more OFDM symbols at an additional subcarrier frequency to carry additional PCRS signals, wherein the one or more PCRS REs are periodically spaced between the one or more OFDM symbols.

In example 211, the machine-readable storage medium of example 210, wherein the subcarrier frequencies have an index X within a first set of N subcarrier frequencies having indices from 0 to N-1; and wherein the additional subcarrier frequency has an index X within a second set of N subcarrier frequencies having indices from 0 to N-1, the second set of N subcarrier frequencies adjacent to the first set of N subcarrier frequencies.

In example 212, the machine-readable storage medium of example 211, wherein the one or more PCRS REs have an even index among the OFDM symbols; and wherein the one or more PCRS REs have an odd index among the OFDM symbols.

Example 213 provides an apparatus of an evolved node b (enb) operable to communicate with a User Equipment (UE) on a wireless network, comprising: one or more processors configured to: establishing a subframe configuration comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; demapping, at a subcarrier frequency, a first set of one or more Resource Elements (REs) carrying a primary Phase Compensated Reference Signal (PCRS) signal with respect to a first portion of the one or more OFDM symbols; and demapping a second set of one or more REs carrying a secondary PCRS signal at the subcarrier frequency with respect to a second portion of the one or more OFDM symbols, wherein the first portion of the one or more OFDM symbols has an even symbol index; and wherein the second portion of the one or more OFDM symbols has an odd symbol index.

In example 214, the apparatus of example 213, wherein the first set of one or more REs corresponds to a primary PCRS antenna port; and wherein the second set of one or more REs corresponds to a secondary PCRS antenna port that is different from the primary PCRS antenna port.

In example 215, the apparatus of example 214, wherein the port number of the primary PCRS antenna port is greater than the port number of the secondary PCRS antenna port.

In example 216, the apparatus of one of examples 214 or 215, wherein the port number of the primary PCRS antenna port is less than the port number of the secondary PCRS antenna port.

In example 217, the apparatus of any one of examples 214 to 216, wherein the primary and secondary PCRS antenna ports are indicated in one of a Downlink Control Information (DCI) transmission or a higher layer signaling transmission.

In example 218, the apparatus of any one of examples 214 to 217, wherein an index of the one or more REs carrying the primary PCRS signal is predetermined based on a port number of the primary antenna port; and wherein an index of the one or more REs carrying the secondary PCRS signal is predetermined based on a port number of the secondary antenna port.

In example 219, the apparatus of any one of examples 213 to 218, wherein the one or more processors are to: demapping, at the subcarrier frequency, additional REs carrying demodulation reference signals (DMRS) with respect to one or more additional OFDM symbols, wherein the additional REs correspond to DMRS antenna ports.

In example 220, the apparatus of example 219, wherein the DMRS antenna port is one of: a primary PCRS antenna port corresponding to the first set of one or more REs; or a secondary PCRS antenna port corresponding to the second set of one or more REs.

In example 221, the apparatus of any one of examples 213 to 220, wherein the one or more processors are to: demapping one or more additional REs carrying one or more respectively corresponding demodulation reference signals (DMRS) with respect to one or more additional OFDM symbols, wherein the subcarrier frequencies are within a set of 48 subcarrier frequencies; wherein one or more additional OFDM symbols are mapped to one or more of the set of 48 subcarrier frequencies.

In example 222, the apparatus of example 151, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from one of: a lowest antenna port corresponding to the one or more DMRSs, or a highest antenna port corresponding to the one or more DMRSs.

In example 223, the apparatus of one of examples 151 or 222, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from an antenna port corresponding to one of the DMRSs at the subcarrier frequency.

In example 224, the apparatus of any one of examples 213 to 223, comprising transceiver circuitry to generate the transmission and process the transmission.

Example 225 provides an evolved node b (eNB) device comprising an application processor, a memory, one or more antenna ports, and an interface to allow the application processor to communicate with another device, the eNB device comprising the apparatus of any of examples 213 to 224.

Example 226 provides a method, comprising: establishing a subframe configuration for an evolved node B comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; demapping, at a subcarrier frequency, a first set of one or more Resource Elements (REs) carrying a primary Phase Compensated Reference Signal (PCRS) signal with respect to a first portion of the one or more OFDM symbols; and demapping a second set of one or more REs carrying a secondary PCRS signal at the subcarrier frequency with respect to a second portion of the one or more OFDM symbols, wherein the first portion of the one or more OFDM symbols has an even symbol index; and wherein the second portion of the one or more OFDM symbols has an odd symbol index.

In example 227, the method of example 226, wherein the first set of one or more REs corresponds to a primary PCRS antenna port; and wherein the second set of one or more REs corresponds to a secondary PCRS antenna port that is different from the primary PCRS antenna port.

In example 228, the method of example 227, wherein a port number of the primary PCRS antenna port is greater than a port number of the secondary PCRS antenna port.

In example 229, the method of one of examples 227 or 228, wherein the port number of the primary PCRS antenna port is less than the port number of the secondary PCRS antenna port.

In example 230, the method of any one of examples 227 to 229, wherein the primary and secondary PCRS antenna ports are indicated in one of a Downlink Control Information (DCI) transmission or a higher layer signaling transmission.

In example 231, the method of any one of examples 227 to 230, wherein an index of the one or more REs carrying the primary PCRS signal is predetermined based on a port number of the primary antenna port; and wherein an index of the one or more REs carrying the secondary PCRS signal is predetermined based on a port number of the secondary antenna port.

In example 232, the method of any one of examples 226 to 231, comprising: demapping, at the subcarrier frequency, additional REs carrying demodulation reference signals (DMRS) with respect to one or more additional OFDM symbols, wherein the additional REs correspond to DMRS antenna ports.

In example 233, the method of example 232, wherein the DMRS antenna port is one of: a primary PCRS antenna port corresponding to the first set of one or more REs; or a secondary PCRS antenna port corresponding to the second set of one or more REs.

In example 234, the method of any of examples 226 to 233, comprising: demapping one or more additional REs carrying one or more respectively corresponding demodulation reference signals (DMRS) with respect to one or more additional OFDM symbols, wherein the subcarrier frequencies are within a set of 48 subcarrier frequencies; wherein one or more additional OFDM symbols are mapped to one or more of the set of 48 subcarrier frequencies.

In example 235, the method of example 234, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from one of: a lowest antenna port corresponding to the one or more DMRSs, or a highest antenna port corresponding to the one or more DMRSs.

In example 236, the method of any one of examples 234 to 235, wherein a primary PCRS antenna port corresponding to the first set of one or more REs is determined at the subcarrier frequency from an antenna port corresponding to one of the DMRSs.

Example 237 provides a machine-readable storage medium having stored thereon machine-executable instructions that, when executed, cause one or more processors to perform the method of any of examples 234-236.

Example 238 provides an apparatus of an evolved node b (enb) operable to communicate with a User Equipment (UE) on a wireless network, comprising: means for establishing a subframe configuration comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; means for demapping, at a subcarrier frequency, a first Set of (REs) of one or more resource elements carrying a primary Phase Compensated Reference Signal (PCRS) signal with respect to a first portion of the one or more OFDM symbols; and demapping a second set of one or more REs carrying a secondary PCRS signal at the subcarrier frequency with respect to a second portion of the one or more OFDM symbols, wherein the first portion of the one or more OFDM symbols has an even symbol index; and wherein the second portion of the one or more OFDM symbols has an odd symbol index.

In example 239, the apparatus of example 238, wherein the first set of one or more REs corresponds to a primary PCRS antenna port; and wherein the second set of one or more REs corresponds to a secondary PCRS antenna port that is different from the primary PCRS antenna port.

In example 240, the apparatus of example 239, wherein the port number of the primary PCRS antenna port is greater than the port number of the secondary PCRS antenna port.

In example 241, the apparatus of one of examples 239 or 240, wherein the port number of the primary PCRS antenna port is less than the port number of the secondary PCRS antenna port.

In example 242, the apparatus of any one of examples 239 to 241, wherein the primary and secondary PCRS antenna ports are indicated in one of a Downlink Control Information (DCI) transmission or a higher layer signaling transmission.

In example 243, the apparatus of any one of examples 239 to 242, wherein an index of the one or more REs carrying the primary PCRS signal is predetermined based on a port number of the primary antenna port; and wherein an index of the one or more REs carrying the secondary PCRS signal is predetermined based on a port number of the secondary antenna port.

In example 244, the apparatus of any one of examples 238 to 243, comprising: means for demapping, at the subcarrier frequency, additional REs carrying demodulation reference signals (DMRS) with respect to one or more additional OFDM symbols, wherein the additional REs correspond to DMRS antenna ports.

In example 245, the apparatus of example 244, wherein the DMRS antenna port is one of: a primary PCRS antenna port corresponding to the first set of one or more REs; or a secondary PCRS antenna port corresponding to the second set of one or more REs.

In example 246, the apparatus of any one of examples 238 to 245, comprising: means for demapping one or more additional REs carrying one or more respectively corresponding demodulation reference signals (DMRS) with respect to one or more additional OFDM symbols, wherein the subcarrier frequencies are within a set of 48 subcarrier frequencies; wherein one or more additional OFDM symbols are mapped to one or more of the set of 48 subcarrier frequencies.

In example 247, the apparatus of example 246, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from one of: a lowest antenna port corresponding to the one or more DMRSs, or a highest antenna port corresponding to the one or more DMRSs.

In example 248, the apparatus of any one of examples 246 to 247, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined at the subcarrier frequency from an antenna port corresponding to one of the DMRS.

Example 249 provides a machine-readable storage medium having machine-executable instructions that, when executed, cause one or more processors of an evolved node b (enb) to perform operations comprising: establishing a subframe configuration comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; demapping, at a subcarrier frequency, a first set of one or more Resource Elements (REs) carrying a primary Phase Compensated Reference Signal (PCRS) signal with respect to a first portion of the one or more OFDM symbols; and demapping a second set of one or more REs carrying a secondary PCRS signal at the subcarrier frequency with respect to a second portion of the one or more OFDM symbols, wherein the first portion of the one or more OFDM symbols has an even symbol index; and wherein the second portion of the one or more OFDM symbols has an odd symbol index.

In example 250, the machine-readable storage medium of example 249, wherein the first set of one or more REs corresponds to a primary PCRS antenna port; and wherein the second set of one or more REs corresponds to a secondary PCRS antenna port that is different from the primary PCRS antenna port.

In example 251, the machine-readable storage medium of example 250, wherein the port number of the primary PCRS antenna port is greater than the port number of the secondary PCRS antenna port.

In example 252, the machine-readable storage medium of one of examples 250 or 251, wherein the port number of the primary PCRS antenna port is less than the port number of the secondary PCRS antenna port.

In example 253, the machine-readable storage medium of any of examples 250 to 252, wherein the primary and secondary PCRS antenna ports are indicated in one of a Downlink Control Information (DCI) transmission or a higher layer signaling transmission.

In example 254, the machine-readable storage medium of any of examples 250 to 253, wherein an index of the one or more REs carrying the primary PCRS signal is predetermined based on a port number of the primary antenna port; and wherein an index of the one or more REs carrying the secondary PCRS signal is predetermined based on a port number of the secondary antenna port.

In example 255, the machine-readable storage medium of any of examples 249-254, the operations comprising: demapping, at the subcarrier frequency, additional REs carrying demodulation reference signals (DMRS) with respect to one or more additional OFDM symbols, wherein the additional REs correspond to DMRS antenna ports.

In example 256, the machine-readable storage medium of example 255, wherein the DMRS antenna port is one of: a primary PCRS antenna port corresponding to the first set of one or more REs; or a secondary PCRS antenna port corresponding to the second set of one or more REs.

In example 257, the machine-readable storage medium of any one of examples 249 to 256, the operations comprising: demapping one or more additional REs carrying one or more respectively corresponding demodulation reference signals (DMRS) with respect to one or more additional OFDM symbols, wherein the subcarrier frequencies are within a set of 48 subcarrier frequencies; wherein one or more additional OFDM symbols are mapped to one or more of the set of 48 subcarrier frequencies.

In example 258, the machine-readable storage medium of example 257, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from one of: a lowest antenna port corresponding to the one or more DMRSs, or a highest antenna port corresponding to the one or more DMRSs.

In example 259, the machine-readable storage medium of any of examples 257 to 258, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined at the subcarrier frequency from an antenna port corresponding to one of the DMRS.

Example 260 provides an apparatus of a User Equipment (UE) operable to communicate with an evolved node b (enb) on a wireless network, comprising: one or more processors configured to: establishing a subframe configuration comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; mapping a first set of one or more Resource Elements (REs) with respect to a first portion of the one or more OFDM symbols at a subcarrier frequency to carry a primary Phase Compensated Reference Signal (PCRS) signal; and mapping a second set of one or more REs with respect to a second portion of the one or more OFDM symbols at the subcarrier frequency to carry a secondary PCRS signal, wherein the first portion of the one or more OFDM symbols has an even symbol index; and wherein the second portion of the one or more OFDM symbols has an odd symbol index.

In example 261, the apparatus of example 260, wherein a dual PCRS indicator carried by Downlink Control Information (DCI) of a Physical Downlink Control Channel (PDCCH) enables the mapping.

In example 262, the apparatus of one of examples 260 or 261, wherein the first set of one or more REs corresponds to a primary PCRS antenna port; and wherein the second set of one or more REs corresponds to a secondary PCRS antenna port that is different from the primary PCRS antenna port.

In example 263, the apparatus of example 262, wherein the port number of the primary PCRS antenna port is greater than the port number of the secondary PCRS antenna port.

In example 264, the apparatus of any one of examples 262 to 263, wherein a port number of the primary PCRS antenna port is less than a port number of the secondary PCRS antenna port.

In example 265, the apparatus of any one of examples 262 to 264, wherein the primary and secondary PCRS antenna ports are indicated in one of a Downlink Control Information (DCI) transmission or a higher layer signaling transmission.

In example 266, the apparatus of any one of examples 262 to 265, wherein an index of the one or more REs carrying the primary PCRS signal is predetermined based on a port number of the primary antenna port; and wherein an index of the one or more REs carrying the secondary PCRS signal is predetermined based on a port number of the secondary antenna port.

In example 267, the apparatus of any one of examples 260 to 266, wherein the one or more processors are to: mapping additional REs with respect to one or more additional OFDM symbols at the subcarrier frequency to carry demodulation reference signals (DMRS), wherein the additional REs correspond to DMRS antenna ports.

In example 268, the apparatus of example 267, wherein the DMRS antenna port is one of: a primary PCRS antenna port corresponding to the first set of one or more REs; or a secondary PCRS antenna port corresponding to the second set of one or more REs.

In example 269, the apparatus of any one of examples 260 to 268, wherein the one or more processors are to: mapping one or more additional REs with respect to one or more additional OFDM symbols to carry one or more respectively corresponding demodulation reference signals (DMRS), wherein the subcarrier frequencies are within a set of 48 subcarrier frequencies; wherein one or more additional OFDM symbols are mapped to one or more of the set of 48 subcarrier frequencies.

In example 270, the apparatus of example 269, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from one of: a lowest antenna port corresponding to the one or more DMRSs, or a highest antenna port corresponding to the one or more DMRSs.

In example 271, the apparatus of one of examples 269 or 270, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from an antenna port corresponding to one of the DMRSs at the subcarrier frequency.

In example 272, the apparatus of any of examples 260 to 271, comprising transceiver circuitry to generate the transmission and process the transmission.

Example 273 provides a User Equipment (UE) device comprising an application processor, a memory, one or more antennas, a wireless interface to allow the application processor to communicate with another device, and a touchscreen display, the UE device comprising the apparatus of any of examples 260-272.

Example 274 provides a method, comprising: establishing a subframe configuration for a user equipment comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; mapping a first set of one or more Resource Elements (REs) with respect to a first portion of the one or more OFDM symbols at a subcarrier frequency to carry a primary Phase Compensated Reference Signal (PCRS) signal; and mapping a second set of one or more REs with respect to a second portion of the one or more OFDM symbols at the subcarrier frequency to carry a secondary PCRS signal, wherein the first portion of the one or more OFDM symbols has an even symbol index; and wherein the second portion of the one or more OFDM symbols has an odd symbol index.

In example 275, the method of example 274, wherein a dual PCRS indicator carried by Downlink Control Information (DCI) of a Physical Downlink Control Channel (PDCCH) enables the mapping.

In example 276, the method of one of examples 274 or 275, wherein the first set of one or more REs corresponds to a primary PCRS antenna port; and wherein the second set of one or more REs corresponds to a secondary PCRS antenna port that is different from the primary PCRS antenna port.

In example 277, the method of example 276, wherein the port number of the primary PCRS antenna port is greater than the port number of the secondary PCRS antenna port.

In example 278, the method of one of examples 276 or 277, wherein the port number of the primary PCRS antenna port is less than the port number of the secondary PCRS antenna port.

In example 279, the method of any of examples 276 to 278, wherein the primary and secondary PCRS antenna ports are indicated in one of a Downlink Control Information (DCI) transmission or a higher layer signaling transmission.

In example 280, the method of any one of examples 276 to 279, wherein an index of the one or more REs carrying the primary PCRS signal is predetermined based on a port number of the primary antenna port; and wherein an index of the one or more REs carrying the secondary PCRS signal is predetermined based on a port number of the secondary antenna port.

In example 281, the method of any of examples 274 to 280, comprising: mapping additional REs with respect to one or more additional OFDM symbols at the subcarrier frequency to carry demodulation reference signals (DMRS), wherein the additional REs correspond to DMRS antenna ports.

In example 282, the method of example 281, wherein the DMRS antenna port is one of: a primary PCRS antenna port corresponding to the first set of one or more REs; or a secondary PCRS antenna port corresponding to the second set of one or more REs.

In example 283, the method of any of examples 274 to 282, comprising: mapping one or more additional REs with respect to one or more additional OFDM symbols to carry one or more respectively corresponding demodulation reference signals (DMRS), wherein the subcarrier frequencies are within a set of 48 subcarrier frequencies; wherein one or more additional OFDM symbols are mapped to one or more of the set of 48 subcarrier frequencies.

In example 284, the method of example 283, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from one of: a lowest antenna port corresponding to the one or more DMRSs, or a highest antenna port corresponding to the one or more DMRSs.

In example 285, the method of one of examples 283 or 284, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from the antenna port corresponding to the one of the DMRS at the subcarrier frequency.

Example 286 provides a machine-readable storage medium having stored thereon machine-executable instructions that, when executed, cause one or more processors to perform the method of any of examples 274 to 285.

Example 287 provides an apparatus of a User Equipment (UE) operable to communicate with an evolved node b (enb) on a wireless network, comprising: means for establishing a subframe configuration comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; means for mapping a first set of one or more Resource Elements (REs) with respect to a first portion of the one or more OFDM symbols at a subcarrier frequency to carry a primary Phase Compensated Reference Signal (PCRS) signal; and means for mapping a second set of one or more REs with respect to a second portion of the one or more OFDM symbols at the subcarrier frequency to carry a secondary PCRS signal, wherein the first portion of the one or more OFDM symbols has an even symbol index; and wherein the second portion of the one or more OFDM symbols has an odd symbol index.

In example 288, the apparatus of example 287, wherein a dual PCRS indicator carried by Downlink Control Information (DCI) of a Physical Downlink Control Channel (PDCCH) enables the mapping.

In example 289, the apparatus of one of examples 287 or 288, wherein the first set of one or more REs corresponds to a primary PCRS antenna port; and wherein the second set of one or more REs corresponds to a secondary PCRS antenna port that is different from the primary PCRS antenna port.

In example 290, the apparatus of example 289, wherein the port number of the primary PCRS antenna port is greater than the port number of the secondary PCRS antenna port.

In example 291, the apparatus of one of examples 289 or 290, wherein the port number of the primary PCRS antenna port is less than the port number of the secondary PCRS antenna port.

In example 292, the apparatus of any one of examples 289-291, wherein the primary and secondary PCRS antenna ports are indicated in one of a Downlink Control Information (DCI) transmission or a higher layer signaling transmission.

In example 293, the apparatus of any of examples 289-292, wherein an index of the one or more REs carrying the primary PCRS signal is predetermined based on a port number of the primary antenna port; and wherein an index of the one or more REs carrying the secondary PCRS signal is predetermined based on a port number of the secondary antenna port.

In example 294, the apparatus of any of examples 287 to 293, comprising: means for mapping additional REs with respect to one or more additional OFDM symbols at the subcarrier frequency to carry a demodulation reference signal (DMRS), wherein the additional REs correspond to DMRS antenna ports.

In example 295, the apparatus of example 294, wherein the DMRS antenna port is one of: a primary PCRS antenna port corresponding to the first set of one or more REs; or a secondary PCRS antenna port corresponding to the second set of one or more REs.

In example 296, the apparatus of any of examples 287 to 295, comprising: means for mapping one or more additional REs with respect to one or more additional OFDM symbols to carry one or more respectively corresponding demodulation reference signals (DMRS), wherein the subcarrier frequencies are within a set of 48 subcarrier frequencies; wherein one or more additional OFDM symbols are mapped to one or more of the set of 48 subcarrier frequencies.

In example 297, the apparatus of example 296, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from one of: a lowest antenna port corresponding to the one or more DMRSs, or a highest antenna port corresponding to the one or more DMRSs.

In example 298, the apparatus of one of examples 296 or 297, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from an antenna port corresponding to one of the DMRSs at the subcarrier frequency.

Example 299 provides a machine-readable storage medium having machine-executable instructions that, when executed, cause one or more processors of a User Equipment (UE) to perform operations comprising: establishing a subframe configuration comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for Uplink (UL) transmission; mapping a first set of one or more Resource Elements (REs) with respect to a first portion of the one or more OFDM symbols at a subcarrier frequency to carry a primary Phase Compensated Reference Signal (PCRS) signal; and mapping a second set of one or more REs with respect to a second portion of the one or more OFDM symbols at the subcarrier frequency to carry a secondary PCRS signal, wherein the first portion of the one or more OFDM symbols has an even symbol index; and wherein the second portion of the one or more OFDM symbols has an odd symbol index.

In example 300, the machine-readable storage medium of example 299, wherein a dual PCRS indicator carried by Downlink Control Information (DCI) of a Physical Downlink Control Channel (PDCCH) enables the mapping.

In example 301, the machine-readable storage medium of one of examples 299 or 300, wherein the first set of one or more REs corresponds to a primary PCRS antenna port; and wherein the second set of one or more REs corresponds to a secondary PCRS antenna port that is different from the primary PCRS antenna port.

In example 302, the machine-readable storage medium of example 301, wherein the port number of the primary PCRS antenna port is greater than the port number of the secondary PCRS antenna port.

In example 303, the machine-readable storage medium of one of examples 301 or 302, wherein the port number of the primary PCRS antenna port is less than the port number of the secondary PCRS antenna port.

In example 304, the machine-readable storage medium of any of examples 301 to 303, wherein the primary and secondary PCRS antenna ports are indicated in one of a Downlink Control Information (DCI) transmission or a higher layer signaling transmission.

In example 305, the machine-readable storage medium of any of examples 301 to 304, wherein an index of the one or more REs carrying the primary PCRS signal is predetermined based on a port number of the primary antenna port; and wherein an index of the one or more REs carrying the secondary PCRS signal is predetermined based on a port number of the secondary antenna port.

In example 306, the machine-readable storage medium of any of examples 299 to 305, the operations comprising: mapping additional REs with respect to one or more additional OFDM symbols at the subcarrier frequency to carry demodulation reference signals (DMRS), wherein the additional REs correspond to DMRS antenna ports.

In example 307, the machine-readable storage medium of example 306, wherein the DMRS antenna port is one of: a primary PCRS antenna port corresponding to the first set of one or more REs; or a secondary PCRS antenna port corresponding to the second set of one or more REs.

In example 308, the machine-readable storage medium of any of examples 299 to 307, the operations comprising: mapping one or more additional REs with respect to one or more additional OFDM symbols to carry one or more respectively corresponding demodulation reference signals (DMRS), wherein the subcarrier frequencies are within a set of 48 subcarrier frequencies; wherein one or more additional OFDM symbols are mapped to one or more of the set of 48 subcarrier frequencies.

In example 309, the machine-readable storage medium of example 308, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined from one of: a lowest antenna port corresponding to the one or more DMRSs, or a highest antenna port corresponding to the one or more DMRSs.

In example 310, the machine-readable storage medium of one of examples 308 or 309, wherein the primary PCRS antenna port corresponding to the first set of one or more REs is determined at the subcarrier frequency from an antenna port corresponding to one of the DMRSs.

In example 311, the apparatus of any one of examples 1 to 17, 72 to 88, 143 to 150, 178 to 185, 213 to 223, and 260 to 271, wherein the one or more processors comprise a baseband processor.

In example 312, the apparatus of any of examples 1-17, 72-88, 143-150, 178-185, 213-223, and 260-271, comprising a memory to store instructions, the memory coupled to the one or more processors.

In example 313, the apparatus of any one of examples 1 to 17, 72 to 88, 143 to 150, 178 to 185, 213 to 223, and 260 to 271, comprising transceiver circuitry to at least one of: generating a transmission, encoding the transmission, processing the transmission, or decoding the transmission.

In example 314, the apparatus of any one of examples 1 to 17, 72 to 88, 143 to 150, 178 to 185, 213 to 223, and 260 to 271, comprising transceiver circuitry to generate the transmission and process the transmission.

The abstract is provided to allow the reader to ascertain the nature and substance of the technical disclosure. The abstract is submitted with the understanding that it will not be used to limit the scope or meaning of the claims. The following claims are hereby incorporated into the detailed description, with each claim standing on its own as a separate embodiment.

Claims

1. An apparatus of a base station, BS, operable to communicate with a user equipment, UE, over a wireless network, comprising:

one or more processors configured to:

transmitting one or more orthogonal frequency division multiplexing, OFDM, symbols for downlink, DL, transmission of a physical downlink shared channel, PDSCH, to the UE; and

allocating one or more phase compensated reference signal, PCRS, resource elements, REs, to carry PCRS signals for DL transmission of a PDSCH to the UE;

wherein the one or more PCRS REs are allocated for at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies,

wherein the one or more PCRS REs include a first set of PCRS REs at a first subcarrier frequency and a second set of PCRS REs at a different second subcarrier frequency, an

Wherein the first subcarrier frequency and the second subcarrier frequency are adjacent to each other and correspond to a first antenna port and a second antenna port.

2. The apparatus of claim 1, wherein the one or more subcarrier frequencies repeat every four physical resource blocks, PRBs, of a DL transmission.

3. The apparatus of claim 1, wherein the one or more processors are further to:

allocating one or more demodulation reference signals (DMRS REs) to carry one or more DMRS signals for DL transmission of a PDSCH to the UE, wherein the one or more DMRS signals are at a common OFDM symbol and separately and respectively at the one or more subcarrier frequencies, and wherein the first and second sets of PCRS REs comprise DMRS REs at a first subcarrier frequency and at a second subcarrier frequency, respectively.

4. The apparatus of claim 1, wherein the first subcarrier frequency and the second subcarrier frequency are at a center of a four physical resource block, PRB, allocation.

5. The apparatus of claim 1, wherein the first subcarrier frequency and the second subcarrier frequency are substantially evenly distributed around a center of a four physical resource block, PRB, allocation.

6. The apparatus of claim 1, wherein the first and second electrodes are disposed in a common plane,

wherein the one or more OFDM symbols are used for data channel transmission.

7. The apparatus of claim 1, wherein the one or more processors are to:

mapping the one or more PCRS REs to the at least a portion of the one or more OFDM symbols at the one or more subcarrier frequencies,

wherein the one or more OFDM symbols are used for the DL transmission.

8. A base station, BS, device comprising an application processor, a memory, one or more antenna ports, and an interface allowing the application processor to communicate with another device, the BS device comprising the apparatus of any of claims 1 to 7.

9. A method, comprising:

transmitting one or more orthogonal frequency division multiplexing, OFDM, symbols for downlink, DL, transmission of a physical downlink shared channel, PDSCH, to a user equipment, UE, for a base station, BS; and

10. The method according to claim 9, wherein the one or more subcarrier frequencies repeat every four physical resource blocks, PRBs, of a DL transmission.

11. The method of claim 9, further comprising:

12. The method of claim 9, wherein the first subcarrier frequency and the second subcarrier frequency are at a center of a four physical resource block, PRB, allocation.

13. The method of claim 9, wherein the first subcarrier frequency and the second subcarrier frequency are substantially evenly distributed around a center of a four physical resource block, PRB, allocation.

14. The method of claim 9, wherein the first and second light sources are selected from the group consisting of a red light source, a green light source, and a blue light source,

wherein the one or more OFDM symbols are used for data channel transmission.

15. The method of claim 9 or 13, comprising:

wherein the one or more OFDM symbols are used for the DL transmission.

16. An apparatus of a base station, BS, operable to communicate with a user equipment, UE, over a wireless network, comprising:

means for transmitting one or more orthogonal frequency division multiplexing, OFDM, symbols for downlink, DL, transmission of a physical downlink shared channel, PDSCH, to the UE; and

means for allocating one or more phase-compensated reference signal (PCRS) Resource Elements (REs) to carry PCRS signals for the DL transmission of a PDSCH to the UE;

17. The apparatus of claim 16, wherein the one or more subcarrier frequencies repeat every four physical resource blocks, PRBs, of a DL transmission.

18. The apparatus of claim 16, further comprising:

means for allocating one or more demodulation reference signals (DMRS REs) to carry one or more DMRS signals for DL transmission of a PDSCH to the UE, wherein the one or more DMRS signals are at a common OFDM symbol and separately and respectively at the one or more subcarrier frequencies, and wherein the first and second sets of PCRS REs comprise DMRS REs at a first subcarrier frequency and at a second subcarrier frequency, respectively.

19. The apparatus of claim 16, wherein the first subcarrier frequency and the second subcarrier frequency are at a center of a four physical resource block, PRB, allocation.

20. The apparatus of claim 16, wherein the first subcarrier frequency and the second subcarrier frequency are substantially evenly distributed around a center of a four physical resource block, PRB, allocation.

21. The apparatus as set forth in claim 16,

wherein the one or more OFDM symbols are used for data channel transmission.

22. The apparatus of claim 16 or 21, comprising:

means for mapping the one or more PCRS REs to the at least a portion of the one or more OFDM symbols at the one or more subcarrier frequencies,

wherein the one or more OFDM symbols are used for the DL transmission.

23. An apparatus of a user equipment, UE, operable to communicate with a base station, BS, over a wireless network, comprising:

one or more processors configured to:

receiving one or more orthogonal frequency division multiplexing, OFDM, symbols for downlink, DL, transmission of a physical Downlink shared channel, PDSCH, from the BS, wherein at least a portion of the one or more OFDM symbols include one or more phase-compensated reference Signal, PCRS, resource elements, REs, allocated to carry PCRS signals for the DL transmission of a PDSCH from the BS; and

demapping the one or more PCRS REs from the at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies;

Wherein the one or more PCRS REs are allocated for the at least a portion of the one or more OFDM symbols at the one or more subcarrier frequencies,

24. The apparatus of claim 23, wherein the one or more subcarrier frequencies repeat every four physical resource blocks, PRBs, of a DL transmission.

25. The apparatus of claim 23, wherein one or more demodulation reference signals (DMRS REs) are allocated to carry one or more DMRS signals for DL transmission of the PDSCH from the BS, wherein the one or more DMRS signals are at a common OFDM symbol and separately and respectively at the one or more subcarrier frequencies, and wherein the first and second sets of PCRS REs comprise DMRS REs at a first subcarrier frequency and at a second subcarrier frequency, respectively.

26. The apparatus of claim 23, wherein the first subcarrier frequency and the second subcarrier frequency are at a center of a four physical resource block, PRB, allocation.

27. The apparatus of claim 23, wherein the first subcarrier frequency and the second subcarrier frequency are substantially evenly distributed around a center of a four physical resource block, PRB, allocation.

28. The apparatus as set forth in claim 23,

wherein the one or more OFDM symbols are used for data channel transmission.

29. A user equipment, UE, device comprising an application processor, a memory, one or more antennas, a wireless interface allowing the application processor to communicate with another device, and a touchscreen display, the UE device comprising the apparatus of any of claims 23 to 28.

30. A method, comprising:

receiving one or more orthogonal frequency division multiplexing, OFDM, symbols for a user Equipment, UE, on a wireless network, the OFDM symbols being for downlink, DL, transmission of a physical Downlink shared channel, PDSCH, from a base station, BS, wherein at least a portion of the one or more OFDM symbols comprise one or more phase-compensated reference Signal, PCRS, resource elements, REs, the one or more PCRS REs being allocated to carry PCRS signals for the DL transmission of a PDSCH from the BS; and

31. The method of claim 30, wherein the one or more subcarrier frequencies repeat every four physical resource blocks, PRBs, of a DL transmission.

32. The method of claim 30, wherein one or more demodulation reference signals (DMRS REs) are allocated to carry one or more DMRS signals for DL transmission of the PDSCH from the BS, wherein the one or more DMRS signals are at a common OFDM symbol and separately and respectively at the one or more subcarrier frequencies, and wherein the first and second sets of PCRS REs comprise DMRS REs at a first subcarrier frequency and at a second subcarrier frequency, respectively.

33. The method of claim 30, wherein the first subcarrier frequency and the second subcarrier frequency are at a center of a four physical resource block, PRB, allocation.

34. The method of claim 30, wherein the first subcarrier frequency and the second subcarrier frequency are substantially evenly distributed around a center of a four physical resource block, PRB, allocation.

35. The method of claim 30, wherein the step of,

wherein the one or more OFDM symbols are used for data channel transmission.

36. An apparatus of a user equipment, UE, operable to communicate with a base station, BS, over a wireless network, comprising:

means for receiving one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols for Downlink (DL) transmission of a Physical Downlink Shared Channel (PDSCH) from the BS, wherein at least a portion of the one or more OFDM symbols include one or more phase-compensated reference signal (PCRS) Resource Elements (REs) allocated to carry PCRS signals for the DL transmission of the PDSCH from the BS; and

means for demapping the one or more PCRS REs from the at least a portion of the one or more OFDM symbols at one or more subcarrier frequencies; and

37. The apparatus of claim 36, wherein the one or more subcarrier frequencies repeat every four physical resource blocks, PRBs, of a DL transmission.

38. The apparatus of claim 36, wherein one or more demodulation reference signals (DMRS REs) are allocated to carry one or more DMRS signals for DL transmission of the PDSCH from the BS, wherein the one or more DMRS signals are at a common OFDM symbol and separately and respectively at the one or more subcarrier frequencies, and wherein the first and second sets of PCRS REs comprise DMRS REs at a first subcarrier frequency and at a second subcarrier frequency, respectively.

39. The apparatus of claim 36, wherein the first subcarrier frequency and the second subcarrier frequency are at a center of a four physical resource block, PRB, allocation.

40. The apparatus of claim 36, wherein the first subcarrier frequency and the second subcarrier frequency are substantially evenly distributed around a center of a four physical resource block, PRB, allocation.

41. The apparatus as set forth in claim 36, wherein,

wherein the one or more OFDM symbols are used for data channel transmission.