US9270435B2 - Sounding reference signal (SRS) usage - Google Patents
Sounding reference signal (SRS) usage Download PDFInfo
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- US9270435B2 US9270435B2 US13/890,678 US201313890678A US9270435B2 US 9270435 B2 US9270435 B2 US 9270435B2 US 201313890678 A US201313890678 A US 201313890678A US 9270435 B2 US9270435 B2 US 9270435B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
Definitions
- Embodiments of the invention generally relate to mobile communications networks, such as, but not limited to, the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN), Long Term Evolution (LTE) Evolved UTRAN (E-UTRAN), and/or LTE-A.
- UMTS Universal Mobile Telecommunications System
- UTRAN Universal Mobile Telecommunications System
- LTE Long Term Evolution
- E-UTRAN Evolved UTRAN
- LTE-A LTE-A
- Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network refers to a communications network including base stations, or Node Bs, and for example radio network controllers (RNC).
- UTRAN allows for connectivity between the user equipment (UE) and the core network.
- the RNC provides control functionalities for one or more Node Bs.
- the RNC and its corresponding Node Bs are called the Radio Network Subsystem (RNS).
- RNS Radio Network Subsystem
- E-UTRAN enhanced UTRAN
- no RNC exists and most of the RNC functionalities are contained in the enhanced Node B (eNodeB or eNB).
- LTE Long Term Evolution
- E-UTRAN refers to improvements of the UMTS through improved efficiency and services, lower costs, and use of new spectrum opportunities.
- LTE is a 3GPP standard that provides for uplink peak rates of at least 50 megabits per second (Mbps) and downlink peak rates of at least 100 Mbps.
- LTE supports scalable carrier bandwidths from 20 MHz down to 1.4 MHz and supports both Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD).
- FDD Frequency Division Duplexing
- TDD Time Division Duplexing
- LTE may also improve spectral efficiency in networks, allowing carriers to provide more data and voice services over a given bandwidth. Therefore, LTE is designed to fulfill the needs for high-speed data and media transport in addition to high-capacity voice support. Advantages of LTE include, for example, high throughput, low latency, FDD and TDD support in the same platform, an improved end-user experience, and a simple architecture resulting in low operating costs.
- LTE-A LTE-Advanced
- LTE-A is directed toward extending and optimizing the 3GPP LTE radio access technologies.
- a goal of LTE-A is to provide significantly enhanced services by means of higher data rates and lower latency with reduced cost.
- LTE-A is a more optimized radio system fulfilling the international telecommunication union-radio (ITU-R) requirements for IMT-Advanced while keeping the backward compatibility.
- ITU-R international telecommunication union-radio
- One embodiment is directed to a method including incorporating into an uplink grant message, by a base station in a communications system, information on whether a last symbol of an uplink subframe is used for physical uplink shared channel (PUSCH), for sounding reference signal (SRS), or is empty.
- the method includes transmitting the uplink grant message comprising the information on the last symbol to a user equipment (UE).
- PUSCH physical uplink shared channel
- SRS sounding reference signal
- Another embodiment is directed to an apparatus including at least one processor and at least one memory comprising computer program code.
- the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to incorporate, into an uplink grant message, information on whether a last symbol of an uplink subframe is used for physical uplink shared channel (PUSCH), for sounding reference signal (SRS), or is empty, and to transmit the uplink grant message comprising the information on the last symbol to a user equipment (UE).
- PUSCH physical uplink shared channel
- SRS sounding reference signal
- Another embodiment is directed to a computer program, embodied on a non-transitory computer readable medium.
- the computer program is configured to control a processor to perform a process.
- the process includes incorporating into an uplink grant message information on whether a last symbol of an uplink subframe is used for physical uplink shared channel (PUSCH), for sounding reference signal (SRS), or is empty, and transmitting the uplink grant message comprising the information on the last symbol to a user equipment.
- PUSCH physical uplink shared channel
- SRS sounding reference signal
- An embodiment is directed to a method including receiving, by a user equipment, an uplink grant message comprising information indicating whether a last symbol of an uplink subframe is used for physical uplink shared channel (PUSCH), for sounding reference signal (SRS), or is empty.
- the method also includes determining from the received information whether the last symbol is available for physical uplink shared channel (PUSCH), or is used for sounding reference signal (SRS) transmission, or is left empty.
- the user equipment is configured to ignore cell specific SRS subframe configuration when determining whether the last symbol of the uplink subframe is available for transmission of PUSCH, SRS, or is left empty.
- Another embodiment is directed to an apparatus including at least one processor and at least one memory comprising computer program code.
- the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to receive an uplink grant message comprising information indicating whether a last symbol of an uplink subframe is used for physical uplink shared channel (PUSCH), for sounding reference signal (SRS), or is empty, and to determine from the received information whether the last symbol is available for physical uplink shared channel (PUSCH), or is used for sounding reference signal transmission, or is left empty.
- the apparatus is configured to ignore cell specific SRS subframe configuration when determining whether the last symbol of the uplink subframe is available for transmission of PUSCH, SRS, or is left empty.
- Another embodiment is directed to a computer program, embodied on a non-transitory computer readable medium.
- the computer program is configured to control a processor to perform a process.
- the process includes receiving an uplink grant message comprising information indicating whether a last symbol of an uplink subframe is used for physical uplink shared channel (PUSCH), for sounding reference signal (SRS), or is empty.
- the process also includes determining from the received information whether the last symbol is available for physical uplink shared channel (PUSCH). The determining comprises ignoring cell specific SRS subframe configuration when determining whether the last symbol of the uplink subframe is available for transmission of PUSCH, SRS, or is left empty.
- FIG. 1 illustrates an example of the uplink frame structure, according to an embodiment
- FIG. 2 a illustrates an example of an apparatus, according to one embodiment
- FIG. 2 b illustrates an example of an apparatus, according to another embodiment
- FIG. 3 a illustrates a flow chart of a method, according to one embodiment
- FIG. 3 b illustrates a flow chart of a method, according to another embodiment.
- the 3GPP RANI study item entitled, “Small Cell Enhancements for E-UTRA and E-UTRAN—Physical-layer Aspects” has an objective of identifying potential enhancements for LTE physical layer operation in a small cell environment.
- SRS sounding reference signals
- Embodiments of the present invention provide an enhancement related to sounding reference signals, for example, in a small cell environment.
- the subframe is configured as a cell specific SRS subframe
- SC-FDMA single carrier frequency division multiple access
- certain embodiments provide a more efficient way to control SRS transmission such that more bandwidth may become available for PUSCH transmission. More specifically, an embodiment allows eNB control of SRS transmission on a per UE basis rather than on a per cell basis, and enables resources that are reserved by default for PUSCH transmission to be used for SRS.
- An LTE small cell environment can be characterized as having following properties: UE(s) are close to the eNB, for example the distance between the eNB and UE(s) is significantly shorter than in a macro cell environment and, consequently, the uplink (UL) path loss is lower than in the larger cells; UE(s) attached to a small cell can be assumed to be low to moderate speed only (high speed UEs are served by macro cell); number of UE(s) served by the small cell is low; and/or number of active UE(s) may change quickly
- Channel conditions can be expected to be more stable and channel coherence bandwidth larger in a small cell when compared to a macro cell. As a result, continuous and frequent sounding of the channel is not needed in a small cell (UL interference characteristics can be measured at the eNB side also without sounding signal).
- FIG. 1 illustrates an example of UL frame structure in LTE Releases 8 to 11 , according to one example.
- the last SC-FDMA symbol (e.g., symbol #13) can be configured for SRS, in which case PUSCH is punctured.
- PUSCH is punctured.
- the UE transmits PUSCH it must puncture the last SC-FDMA symbol (e.g., symbol #13) of the subframe if the subframe is configured as cell specific SRS subframe regardless of whether the UE actually transmits SRS or not.
- the cell-specific configuration of SRS transmission opportunities is periodic even with aperiodic SRS transmission, meaning that SC-FDMA symbols are reserved deterministically in every nth subframe, even if the need for transmitting SRS occurs only every now and then.
- SRS transmission bandwidth is configurable and UE-specific SRS may occupy almost the whole UL band or just a few physical resource blocks (PRBs).
- PRBs physical resource blocks
- the allocation of the last subframe symbol to either PUSCH or SRS is part of cell configuration.
- the SRS resources need to be dimensioned to facilitate the highest expected number of active UEs. In a small cell environment, such burst of UEs occurs only occasionally and SRS load is frequently low. Then, a significant portion of resource elements on the last symbol are not used for PUSCH or SRS. Unnecessary puncturing of the last symbol of the PUSCH results in loss in spectral efficiency as 1/12 of the PUSCH resources are lost. Therefore, an efficient method to allocate last symbol of the subframe for PUSCH or SRS would be beneficial.
- an objective may be that a reduction in SRS transmissions can be translated to more efficient PUSCH transmission.
- certain embodiments provide that the last symbol of the subframe can be flexibly used for PUSCH or for SRS. In one embodiment, this may be achieved by means of a specific SRS configuration (referred to herein as SRS configuration type B) combined with a specific SRS trigger type (referred to herein as SRS trigger type B).
- a specific operation is defined for terminals configured for SRS configuration type B.
- the UE ignores cell specific SRS subframe configuration when determining if the last symbol of the subframe is available for transmission of PUSCH, or SRS, or is left empty.
- the uplink grant may contain the information, for instance in a SRS trigger type B, if the last symbol of the subframe is used for PUSCH, for SRS, or if the symbol is left empty.
- the possibility of leaving the last symbol empty can prevent collision between PUSCH and SRS transmission from other terminals.
- the possibility for dynamic muting of the last symbol facilitates SRS transmission from other terminals on subframes that are not contained in the cell specific SRS subframe configuration.
- An example way to enable keeping the last PUSCH SC-FDMA empty is to define zero-power SRS configuration, i.e., a transmission similar to SRS in terms of, for example, bandwidth but with zero power. This allows for flexible muting of the last PUSCH symbol, making it easier to align the PUSCH/SRS transmission of different users.
- SRS configuration type B can be defined by using existing SRS configuration and related parameters.
- usage of SRS trigger type B is combined with SRS configuration type B only.
- the UE can support multiple parallel SRS configuration type B, in addition to existing SRS configurations.
- some of the existing SRS configuration parameters can be optimized to support improved functionality with SRS configuration type B.
- SRS Periodicity (TSRS) of 1 ms could be supported with SRS configuration type B (due to the fact that SRS configuration type B does not introduce any overhead in the case SRS is not triggered).
- Cell specific SRS subframe configuration can still be used in the cell by earlier release UEs (e.g., prior to Release 11) and UEs not configured for the new mode provided by embodiments of the invention, such as UEs performing initial access in the small cell.
- the density (or periodicity) of cell specific SRS subframe configuration can be considerably decreased (or periodicity increased) with the use of embodiments of invention.
- SRS trigger type B would have the highest priority compared to trigger type 0 or 1 . This would allow, for example, a Release 12 UE to transmit PUSCH via resources configured for cell specific SRS (assuming that those resources are not actually used for transmitting SRS).
- one additional bit may be included in the uplink grant.
- the additional bit e.g., “PUSCH in the last symbol bit”
- PUSCH in the last symbol bit can be used to inform whether the last symbol of the subframe is available for PUSCH.
- one bit in the UL grant i.e., a “SRS request bit” informs the UE whether it should send SRS.
- the “SRS request bit” and “PUSCH in the last symbol bit” may be interpreted jointly as follows:
- One of the issues to solve with SRS trigger type B is the procedure to be used with hybrid automatic repeat request (HARQ) re-transmissions (where the trigger bits are not available).
- HARQ hybrid automatic repeat request
- one approach may be to have the HARQ re-transmissions follow a pre-defined codepoint of SRS trigger type B, e.g., ‘ 01 ’ do not transmit SRS and transmit PUSCH in the last symbol.
- another embodiment may follow puncturing rules defined for overlapping cell-specific SRS (if configured). In situations where the eNB wants to change the SRS strategy for the retransmissions, it can use scheduled adaptive re-transmission.
- FIG. 2 a illustrates an example of an apparatus 10 according to an embodiment.
- apparatus 10 may be a base station, such as a node B or eNB. It should be noted that one of ordinary skill in the art would understand that apparatus 10 may include components or features not shown in FIG. 2 a . Only those components or feature necessary for illustration of the invention are depicted in FIG. 2 a.
- apparatus 10 includes a processor 22 for processing information and executing instructions or operations.
- processor 22 may be any type of general or specific purpose processor. While a single processor 22 is shown in FIG. 2 a , multiple processors may be utilized according to other embodiments. In fact, processor 22 may include one or more of general-purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and processors based on a multi-core processor architecture, as examples.
- DSPs digital signal processors
- FPGAs field-programmable gate arrays
- ASICs application-specific integrated circuits
- Apparatus 10 further includes a memory 14 , which may be coupled to processor 22 , for storing information and instructions that may be executed by processor 22 .
- Memory 14 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, fixed memory, and removable memory.
- memory 14 can be comprised of any combination of random access memory (RAM), read only memory (ROM), static storage such as a magnetic or optical disk, or any other type of non-transitory machine or computer readable media.
- the instructions stored in memory 14 may include program instructions or computer program code that, when executed by processor 22 , enable the apparatus 10 to perform tasks as described herein.
- Apparatus 10 may also include one or more antennas 25 for transmitting and receiving signals and/or data to and from apparatus 10 .
- Apparatus 10 may further include a transceiver 28 configured to transmit and receive information.
- transceiver 28 may be configured to modulate information on to a carrier waveform for transmission by the antenna(s) 25 and demodulates information received via the antenna(s) 25 for further processing by other elements of apparatus 10 .
- transceiver 28 may be capable of transmitting and receiving signals or data directly.
- Processor 22 may perform functions associated with the operation of apparatus 10 including, without limitation, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 10 , including processes related to management of communication resources.
- memory 14 stores software modules that provide functionality when executed by processor 22 .
- the modules may include, for example, an operating system that provides operating system functionality for apparatus 10 .
- the memory may also store one or more functional modules, such as an application or program, to provide additional functionality for apparatus 10 .
- the components of apparatus 10 may be implemented in hardware, or as any suitable combination of hardware and software.
- apparatus 10 may be a base station, such as a node B or eNB, for example.
- apparatus 10 may be controlled by memory 14 and processor 22 to incorporate, into an uplink grant message, information on whether a last symbol of the uplink frame structure is used for PUSCH, is used for sounding reference signal (SRS), or is left empty.
- Apparatus 10 may be controlled by memory 14 and processor 22 to transmit the uplink grant message comprising the information on the last symbol to a UE.
- the information is a new SRS trigger type (e.g., SRS trigger type B).
- the new SRS trigger type e.g., SRS trigger type B
- has a higher priority than existing SRS trigger types e.g., trigger type 0 or 1 ).
- apparatus 10 may be controlled by memory 14 and processor 22 to incorporate a single bit in the uplink grant message to indicate whether the last symbol is available for PUSCH, and another bit in the uplink grant message to indicate whether the UE should send SRS.
- the one bit indicating whether the last symbol is available for PUSCH and the one bit indicating whether the UE should send sounding reference signal (SRS) may be interpreted jointly, for example, according to the following:
- a first and a second SRS configuration are provided, in which case the one bit indicating whether the last symbol is available for PUSCH and the one bit indicating whether the UE should send sounding reference signal (SRS) may be interpreted jointly, for example, according to the following:
- apparatus 10 may be controlled by memory 14 and processor 22 to incorporate two bits in the uplink grant message to indicate whether the last symbol is available for physical uplink shared channel (PUSCH).
- PUSCH physical uplink shared channel
- the two bits in the uplink grant message indicating whether the last symbol is available for physical uplink shared channel (PUSCH) may be interpreted according to the following:
- apparatus 10 may be controlled by memory 14 and processor 22 to define a zero-power sounding reference signal (SRS) configuration to allow for flexible muting of the last symbol.
- SRS new sounding reference signal
- HARQ hybrid automatic repeat request
- the hybrid automatic repeat request (HARQ) re-transmissions can follow a pre-defined codepoint of the new sounding reference signal (SRS) trigger type or can follow puncturing rules defined for overlapping cell-specific sounding reference signal (SRS) resources.
- FIG. 2 b illustrates an example of an apparatus 20 according to another embodiment.
- apparatus 20 may be a UE. It should be noted that one of ordinary skill in the art would understand that apparatus 20 may include components or features not shown in FIG. 2 b . Only those components or feature necessary for illustration of the invention are depicted in FIG. 2 b.
- apparatus 20 includes a processor 32 for processing information and executing instructions or operations.
- processor 32 may be any type of general or specific purpose processor. While a single processor 32 is shown in FIG. 2 b , multiple processors may be utilized according to other embodiments. In fact, processor 32 may include one or more of general-purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and processors based on a multi-core processor architecture, as examples.
- DSPs digital signal processors
- FPGAs field-programmable gate arrays
- ASICs application-specific integrated circuits
- Apparatus 20 further includes a memory 34 , which may be coupled to processor 32 , for storing information and instructions that may be executed by processor 32 .
- Memory 34 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, fixed memory, and removable memory.
- memory 34 can be comprised of any combination of random access memory (RAM), read only memory (ROM), static storage such as a magnetic or optical disk, or any other type of non-transitory machine or computer readable media.
- the instructions stored in memory 34 may include program instructions or computer program code that, when executed by processor 32 , enable the apparatus 20 to perform tasks as described herein.
- Apparatus 20 may also include one or more antennas 35 for transmitting and receiving signals and/or data to and from apparatus 20 .
- Apparatus 20 may further include a transceiver 38 configured to transmit and receive information.
- transceiver 38 may be configured to modulate information on to a carrier waveform for transmission by the antenna(s) 35 and demodulates information received via the antenna(s) 35 for further processing by other elements of apparatus 20 .
- transceiver 38 may be capable of transmitting and receiving signals or data directly.
- Processor 32 may perform functions associated with the operation of apparatus 20 including, without limitation, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 20 , including processes related to management of communication resources.
- memory 34 stores software modules that provide functionality when executed by processor 32 .
- the modules may include, for example, an operating system that provides operating system functionality for apparatus 20 .
- the memory may also store one or more functional modules, such as an application or program, to provide additional functionality for apparatus 20 .
- the components of apparatus 20 may be implemented in hardware, or as any suitable combination of hardware and software.
- apparatus 20 may be a UE.
- apparatus 20 may be controlled by memory 34 and processor 32 to receive an uplink grant message comprising information indicating whether a last symbol of an uplink frame structure is used for physical uplink shared channel (PUSCH), for sounding reference signal (SRS), or is empty.
- Apparatus 20 may then be controlled by memory 34 and processor 32 to determine from the received new sounding reference signal (SRS) trigger whether the last symbol is available for physical uplink shared channel (PUSCH), or for sounding reference signal (SRS), or is to be left empty.
- SRS new sounding reference signal
- the information included in the uplink grant message may be a new SRS trigger type (e.g., SRS trigger type B) that may have a higher priority than existing SRS trigger types (e.g., trigger type 0 or 1 ).
- apparatus 20 may be controlled to determine whether or not to transmit SRS or PUSCH in the last symbol and/or whether to puncture PUSCH according to the interpretation of bits in the uplink grant message discussed above in connection with FIG. 2 a.
- FIG. 3 a illustrates an example of a flow chart of a method for controlling SRS transmission, according to one embodiment.
- the method of FIG. 3 a may be performed by a base station, such as a node B or eNB.
- the method may include, at 300 , incorporating, into an uplink grant message, information on whether a last symbol of an uplink frame structure is used for PUSCH, for SRS, or is empty.
- the method may also include, at 310 , transmitting the uplink grant message comprising the information on the last symbol to a UE.
- the method may also include, at 320 , defining a zero-power SRS configuration.
- FIG. 3 b illustrates an example of a flow chart of a method for controlling SRS transmission, according to another embodiment.
- the method of FIG. 3 b may be performed by a UE.
- the method may include, at 350 , receiving an uplink grant message comprising information indicating whether a last symbol of an uplink frame structure is used for physical uplink shared channel (PUSCH), for sounding reference signal (SRS), or is left empty.
- the method may then include, at 360 , determining from the received information whether the last symbol is available for physical uplink shared channel (PUSCH), or for sounding reference signal (SRS), or is to be left empty.
- PUSCH physical uplink shared channel
- SRS sounding reference signal
- any of the methods described herein may be implemented by software stored in memory or other computer readable or tangible media, and executed by a processor.
- the functionality may be performed by hardware, for example through the use of an application specific integrated circuit (ASIC), a programmable gate array (PGA), a field programmable gate array (FPGA), or any other combination of hardware and software.
- ASIC application specific integrated circuit
- PGA programmable gate array
- FPGA field programmable gate array
- the computer readable media mentioned above may be at least partially embodied by a transmission line, a compact disk, digital-video disk, a magnetic disk, holographic disk or tape, flash memory, magnetoresistive memory, integrated circuits, or any other digital processing apparatus memory device.
- Embodiments of the invention can provide several advantages. For example, certain embodiments allow for faster triggering and improved latency for aperiodic SRS without any increase in the SRS overhead, as aperiodic SRS transmission does not need to “wait” for cell-specific SRS resources. In addition, the overhead due to resources reserved for SRS but not used can be avoided. The implementation complexity according to certain embodiments is very minor. Also, embodiments are fully backwards compatible in the sense that legacy UE(s) supporting the feature do not suffer from it at all.
Abstract
Description
-
- A straightforward interpretation of the two bits may include:
- ‘00’ do not transmit SRS, puncture PUSCH;
- ‘01’ do not transmit SRS, transmit PUSCH in the last symbol;
- ‘10’ transmit SRS, puncture PUSCH;
- ‘11’ transmit SRS, transmit PUSCH (transmissions must be in non-overlapping PRBs). Simultaneous SRS and PUSCH in the same cell may not be considered as valid option, so this combination may be replaced by another interpretation, as discussed below.
- With two different SRS configurations, an interpretation of the two bits may include:
- ‘00’ do not transmit SRS, puncture PUSCH;
- ‘01’ do not transmit SRS, transmit PUSCH in the last symbol;
- ‘10’ transmit
SRS config 1, puncture PUSCH; - ‘11’ transmit
SRS config 2, puncture PUSCH.
- A straightforward interpretation of the two bits may include:
-
- ‘00’ puncture PUSCH in the last symbol;
- ‘01’ transmit part of the allocated PUSCH PRBs;
- ‘10’ transmit another part of the allocated PUSCH
-
- ‘11’ transmit PUSCH.
-
- ‘00’ indicates to not transmit SRS, and puncture PUSCH;
- ‘01’ indicates to not transmit SRS, and transmit PUSCH in the last symbol;
- ‘10’ indicates to transmit SRS, and puncture PUSCH;
- ‘11’ indicates to transmit SRS, and transmit PUSCH.
-
- ‘00’ indicates to not transmit SRS, and puncture PUSCH;
- ‘01’ indicates to not transmit SRS, and transmit PUSCH in the last symbol;
- ‘10’ indicates to transmit first SRS configuration, and puncture PUSCH;
- ‘11’ indicates to transmit second SRS configuration, and puncture PUSCH.
-
- ‘00’ indicates to puncture PUSCH in the last symbol;
- ‘01’ indicates to transmit part of the allocated PUSCH physical resource blocks (PRBs);
- ‘10’ indicates to transmit another part of the allocated PUSCH PRBs;
- ‘11’ indicates to transmit PUSCH.
Claims (38)
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US13/890,678 US9270435B2 (en) | 2013-05-09 | 2013-05-09 | Sounding reference signal (SRS) usage |
EP14716773.8A EP2995032B1 (en) | 2013-05-09 | 2014-03-28 | Efficient sounding reference signal (srs) symbol usage for sounding and data |
PCT/EP2014/056241 WO2014180601A1 (en) | 2013-05-09 | 2014-03-28 | Efficient sounding reference signal (srs) symbol usage for sounding and data |
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US13/890,678 US9270435B2 (en) | 2013-05-09 | 2013-05-09 | Sounding reference signal (SRS) usage |
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US9270435B2 true US9270435B2 (en) | 2016-02-23 |
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EP2995032A1 (en) | 2016-03-16 |
US20140334390A1 (en) | 2014-11-13 |
EP2995032B1 (en) | 2018-09-05 |
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