Classifications

• • 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
  • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
  • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
  • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
  • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
  • H03M13/09—Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
  • H04L1/0056—Systems characterized by the type of code used
  • H04L1/0061—Error detection codes
• • 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
  • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
  • H04W72/044—Wireless resource allocation based on the type of the allocated resource
  • H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

• a wireless multiple-access communications system may include a number of base stations or access network nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE).
• UE user equipment
• the apparatus may include a processor, memory in electronic communication with the processor, and
• a non-transitory computer readable medium for wireless communication may include instructions operable to cause a processor to identify a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission.
• the instructions may be further operable to cause a processor to calculate a set of CRC bits based at least in part on both the set of reference signal bits and the set of data bits, and transmit the DMRS transmission and the data transmission with the set of CRC bits.
• the set of reference signal bits comprises a first subset of reference signal bits that may be conveyed with the DMRS transmission and a second subset of reference signal bits that may be conveyed with the data transmission.
• the set of CRC bits may be calculated based at least in part on the first subset of reference signal bits, the second subset of reference signal bits, and the set of data bits.
• Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for switching from the first CRC configuration to the second CRC configuration based at least in part on a size of the set of reference signal bits, a size of the set of data bits, a size of the set of CRC bits, or a combination thereof.
• Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for identifying a scrambling code based at least in part on the set of reference signal bits. Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for scrambling the set of data bits based at least in part on the identified scrambling code.
• the apparatus may include means for detecting a set of reference signal bits associated with a DMRS transmission, means for decoding a set of data bits associated with a data transmission, means for receiving a set of CRC bits with the set of data bits, and means for performing a CRC verification process based at least in part on the set of CRC bits, wherein the set of CRC bits is computed based at least in part on both the set of reference signal bits and the set of data bits.
• a non-transitory computer readable medium for wireless communication may include instructions operable to cause a processor to detect a set of reference signal bits associated with a DMRS transmission, decode a set of data bits associated with a data transmission, receive a set of CRC bits with the set of data bits, and perform a CRC verification process based at least in part on the set of CRC bits, wherein the set of CRC bits is computed based at least in part on both the set of reference signal bits and the set of data bits.
• a further method of wireless communication may include identifying a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission.
• the method may further include identifying a scrambling code based at least in part on the set of reference signal bits, scrambling the set of data bits based at least in part on the identified scrambling code, and transmitting the DMRS transmission and the data transmission.
• the apparatus may include means for identifying a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission.
• the apparatus may further include means for identifying a scrambling code based at least in part on the set of reference signal bits, means for scrambling the set of data bits based at least in part on the identified scrambling code, and means for transmitting the DMRS transmission and the data transmission.
• the apparatus may include a processor, memory in electronic communication with the processor, and
• the instructions may be operable to cause the processor to identify a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission.
• the instructions may be further operable to cause the processor to identify a scrambling code based at least in part on the set of reference signal bits, scramble the set of data bits based at least in part on the identified scrambling code, and transmit the DMRS transmission and the data transmission.
• a non-transitory computer readable medium for wireless communication may include instructions operable to cause a processor to identify a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission.
• the instructions may be further operable to cause a processor to identify a scrambling code based at least in part on the set of reference signal bits, scramble the set of data bits based at least in part on the identified scrambling code, and transmit the DMRS transmission and the data transmission.
• Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for calculating a set of CRC bits based at least in part on both the set of reference signal bits and the set of data bits.
• the data transmission may be transmitted using a physical data channel.
• the DMRS transmission may be transmitted using resources reserved for DMRS transmissions.
• the DMRS transmission may convey phase reference information associated with the physical data channel.
• a further method of wireless communication may include detecting a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission, identifying a scrambling code based on the set of reference signal bits, and scrambling the set of data bits based on the identified scrambling code.
• the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory.
• the instructions may be executable by the processor to cause the apparatus to detect a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission, identify a scrambling code based on the set of reference signal bits, and descramble the set of data bits based on the identified scrambling code.
• the apparatus may include means for detecting a set of reference signal bits associated with a DMRS
• a non-transitory computer-readable medium storing code for wireless
• the code may include instructions executable by a processor to detect a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission, identify a scrambling code based on the set of reference signal bits, and descramble the set of data bits based on the identified scrambling code.
• the data transmission may be transmitted using a physical data channel.
• Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for performing a CRC verification process based on a set of CRC bits, where the set of CRC bits may be computed based on both the set of reference signal bits and the set of data bits.
• the data transmission may be transmitted using a physical data channel and the DMRS transmission may be transmitted using resources reserved for DMRS transmissions.
• the DMRS transmission conveys phase reference information associated with the physical data channel.
• FIGs. 1 and 2 illustrate examples of systems for wireless communication that support providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• FIG. 3 illustrates an example of resource element (RE) mapping that supports providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• RE resource element
• FIG. 4 illustrates an example of a CRC computation process with DMRS signaling information that supports providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• FIG. 5 illustrates an example of a CRC masking process with DMRS signaling information that supports providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• FIG. 6 illustrates an example of a CRC masking function that supports providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• FIGs. 7 and 8 illustrate example of process flows that support providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• FIGs. 9 through 11 show block diagrams of a device that supports providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• FIG. 12 illustrates a block diagram of a system including a user equipment (UE) that supports providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• UE user equipment
• FIG. 13 illustrates a block diagram of a system including a base station that supports providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• FIGs. 14 through 19 illustrate methods for providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• a device such as a base station or a user equipment (UE)— may transmit a DMRS associated with a physical data channel, and may transmit a data payload on the same physical data channel.
• the DMRS may include signaling information in addition to channel estimation information.
• the signaling information may be conveyed in the DMRS using pseudo noise (PN) sequences.
• PN pseudo noise
• the transmitting device may employ data protection techniques to the signaling information and modify the data payload with information corresponding to the signaling information.
• the transmitting device may employ CRC techniques to include verification for the signaling information. For example, the device may compute the CRC bits based on the signaling information in the DMRS in addition to the information in the payload. In another example, the device may compute a preliminary set of CRC bits based on information in the payload. The device may then mask the preliminary set of CRC bits using a bit array generated based on the DMRS signaling information. In both examples, the resulting set of CRC bits may include indications of the correct DMRS signaling information.
• the device may select or be configured with a CRC configuration (e.g., computing the CRC based on the DMRS signaling information or masking the CRC based on the DMRS signaling information) statically or dynamically. In some cases, the selection may be based on a number of DMRS signaling information bits, data payload information bits, CRC bits, or some combination of these numbers of bits.
• the device may transmit the CRC bits in the data payload to a receiving device, and the receiving device may use the CRC bits to verify the decoding of information received in both the data payload and the DMRS.
• the transmitting device may determine a scrambling code based on the DMRS signaling information.
• the device may scramble the data payload bits based on the determined scrambling code.
• a receiving device may detect the DMRS signaling information, and may begin decoding the data payload based on the detected DMRS signaling information. If the receiving device incorrectly detected the DMRS signaling information, decoding of the data payload may fail early in the process due to the scrambled payload bits.
• aspects of the disclosure are initially described in the context of wireless communications systems. Further aspects of the disclosure are described with reference to a resource element (RE) mapping format, CRC processes with DMRS signaling information, a CRC masking function, and process flow diagrams. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to providing protection for information delivered in DMRS.
• RE resource element
• FIG. 1 illustrates an example of a wireless communications system 100 in accordance with various aspects of the present disclosure.
• the wireless communications system 100 includes base stations 105, UEs 115, and a core network 130.
• the wireless communications system 100 may be a 5th Generation (5G)/New Radio ( R) or long term evolution (LTE) (or LTE- Advanced (LTE-A)) network.
• wireless communications system 100 may support enhanced broadband communications, ultra- reliable (i.e., mission critical) communications, low latency communications, and
• the wireless communications system 100 may support conveying signaling information in DMRS transmissions in addition to channel estimation information.
• a device may protect the signaling information within the DMRS (e.g., using CRC or scrambling techniques) and may modify data transmissions to include the protection, which may improve detection reliability and decrease latency associated with conveying signaling information in DMRS.
• Base stations 105 may wirelessly communicate with UEs 115 via one or more base station antennas. Each base station 105 may provide communication coverage for a respective geographic coverage area 110.
• Communication links 125 shown in wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions, from a base station 105 to a UE 115.
• Control information and data may be multiplexed on an uplink channel or downlink according to various techniques. Control information and data may be multiplexed on a downlink channel, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
• TDM time division multiplexing
• FDM frequency division multiplexing
• hybrid TDM-FDM techniques hybrid TDM-FDM techniques.
• the control information transmitted during a transmission time interval (TTI) of a downlink channel may be distributed between different control regions in a cascaded manner (e.g., between a common control
• UEs 115 may be dispersed throughout the wireless communications system 100, and each UE 115 may be stationary or mobile.
• a UE 115 may also be referred to as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
• a UE 115 may also be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a personal electronic device, a handheld device, a personal computer, a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, a machine type communication (MTC) device, an appliance, an automobile, or the like.
• PDA personal digital assistant
• WLL wireless local loop
• IoT Internet of Things
• IoE Internet of Everything
• MTC machine type communication
• a UE 115 may also be able to communicate directly with other UEs (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol).
• P2P peer-to-peer
• D2D device-to-device
• One or more of a group of UEs 115 utilizing D2D communications may be within the coverage area 110 of a cell. Other UEs 115 in such a group may be outside the coverage area 110 of a cell, or otherwise unable to receive transmissions from a base station 105.
• groups of UEs 115 communicating via D2D communications may utilize a one-to-many (1 :M) system in which each UE 1 15 transmits to every other UE 115 in the group.
• a base station 105 facilitates the scheduling of resources for D2D communications.
• D2D communications are carried out independent of a base station 105.
• Some UEs 115 may be low cost or low complexity devices, and may provide for automated communication between machines, i.e., Machine-to- Machine (M2M) communication.
• M2M or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station without human intervention.
• M2M or MTC may refer to communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application program that can make use of the information or present the information to humans interacting with the program or application.
• Some UEs 115 may be designed to collect information or enable automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
• an MTC device may operate using half-duplex (one-way) communications at a reduced peak rate. MTC devices may also be configured to enter a power saving "deep sleep" mode when not engaging in active communications. In some examples, MTC or IoT devices may be designed to support mission critical functions and wireless communications system may be configured to provide ultra-reliable communications for these functions.
• Base stations 105 may communicate with the core network 130 and with one another. For example, base stations 105 may interface with the core network 130 through backhaul links 132 (e.g., SI, etc.). Base stations 105 may communicate with one another over backhaul links 134 (e.g., X2, etc.) either directly or indirectly (e.g., through core network 130). Base stations 105 may perform radio configuration and scheduling for communication with UEs 115, or may operate under the control of a base station controller (not shown). In some examples, base stations 105 may be macro cells, small cells, hot spots, or the like. Base stations 105 may also be referred to as evolved NodeBs (e Bs) 105.
• e Bs evolved NodeBs
• Wireless communications system 100 may support operation on multiple cells or carriers, a feature which may be referred to as carrier aggregation (CA) or multi-carrier operation.
• a carrier may also be referred to as a component carrier (CC), a layer, a channel, etc.
• carrier may also be referred to as a component carrier (CC), a layer, a channel, etc.
• carrier may also be referred to as a component carrier (CC), a layer, a channel, etc.
• a UE 115 may be configured with multiple downlink CCs and one or more uplink CCs for carrier aggregation.
• Carrier aggregation may be used with both frequency division duplexed (FDD) and time division duplexed (TDD) component carriers.
• FDD frequency division duplexed
• TDD time division duplexed
• the transmitting device may include an indication within the CRC bits 230 of information (e.g., signaling information) transmitted in the DMRS 210, or the transmitting device may determine a scrambling code based on the information in the DMRS 210, and may scramble bits within the payload 215 based on the scrambling code.
• information e.g., signaling information
• a wireless transmitter may transmit a reference signal—such as a DMRS 210— to a receiving device in order for the receiving device to perform channel estimation.
• a reference signal such as a DMRS 210
• UE 115-a may transmit a DMRS 210 to base station 105-a
• base station 105-a may estimate a channel quality or a phase shift associated with the wireless channel based on the received DMRS 210.
• base station 105-a may transmit a DMRS 210 to UE 115-a for channel estimation (e.g., in addition to or instead of transmitting a cell-specific reference signal).
• a DMRS 210 may be associated with a physical data channel, such as a physical broadcast channel (PBCH), a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), or any other channel that carries data payloads 215.
• PBCH physical broadcast channel
• PUSCH physical uplink shared channel
• PUCCH physical uplink control channel
• PDSCH physical downlink shared channel
• a device may transmit the DMRS 210 over the associated physical data channel, or in resources allocated for DMRS transmission.
• a device may extend the functionality of DMRS 210 beyond channel estimation.
• base station 105-a and/or UE 115-a may include signaling information 220-a in the DMRS 210.
• This signaling information 220-a may include a timing indication, a payload identifier, or other signaling information.
• the timing indication may include a system frame number (SFN), a synchronization signal block time index, or any other timing information associated with a physical data channel.
• the payload identifier may identify one or more multiplexed payloads 215 in a physical data channel (e.g., for a PUSCH, uplink control information (UCI) multiplexed payloads).
• UCI uplink control information
• the device may construct DMRSs 210 using different DMRS sequences, where the different DMRS sequences may correspond to the signaling information to transmit within the DMRS 210.
• the DMRS sequences may be constructed based on pseudorandom-noise (PN) sequences, which may reduce cross- correlation of bits between different DMRS sequences.
• PN pseudorandom-noise
• the device may utilize one of sixteen DMRS sequences to indicate the information.
• a device receiving the DMRS 210 may perform correlation and/or detection to determine the signaled DMRS sequence.
• the device may correlate the received signal with a DMRS sequence hypothesis, and may select a received DMRS sequence based on the hypothesis and the received DMRS signal.
• the PN sequences used to construct the DMRS sequences may limit the false alarm rate—that is, the receiver may select an incorrect DMRS sequence, and in turn decode incorrect information bits based on the incorrect detection of the DMRS sequence).
• a device e.g., base station 105-a and/or UE 115-a
• the device may determine the number of bits of signaling information 220-a to transmit in the DMRS 210 and the number of bits of signaling information 220-b to transmit in the data payload 215 based on a significance of the bits, a number of bits available for signaling information in the DMRS 210, or other signaling information splitting criteria.
• the complete set of signaling information bits 220 may be referred to as N bits.
• the signaling information bits 220-a transmitted in the DMRS 210 may be referred to as Nl bits
• the signaling information bits 220-b transmitted in the payload 215 may be referred to as N2 bits.
• the signaling information bits 220 may include bits indicating an SFN or a synchronization signal block. For example, for the SFN, the device may transmit a total of 10 signaling information bits 220, including 2 bits (e.g., Nl bits) in the DMRS 210 and 8 bits (e.g., N2 bits) in the data payload 215. In another example, the device may transmit all of the SFN signaling information bits 220 in the DMRS 210, in which case the data payload 215 may not include any N2 bits.
• 2 bits e.g., Nl bits
• 8 bits e.g., N2 bits
• a device may receive a DMRS 210, and in some examples the device may detect an incorrect DMRS sequence associated with the DMRS 210 (e.g., based on channel noise, an incorrect DMRS hypothesis, etc.). This incorrect DMRS detection may result in processing latency or delays at the device. For example, the device may begin decoding a data payload 215 received over a physical data channel (e.g., the PBCH) using the incorrect DMRS sequence, which may result in decoding failure. The device may determine the decoding failure based on channel coding or CRC bits 230 associated with the data payload 215. In one aspect, the device may identify that the decoding failure is based on an incorrect DMRS sequence, and the device may remove the DMRS sequence from physical data channel decoding.
• a physical data channel e.g., the PBCH
• the device may not determine whether the decoding failure is based on the selected DMRS sequence or the received signals corresponding to the data payload 215. In such an aspect, the device may not remove the DMRS sequence from data channel decoding. In some procedures, the device may decode a data payload 215 despite using an incorrect DMRS sequence. However, further processing of the payload 215 (e.g., remaining minimum system information (RMSI) acquisition) may eventually fail based on the incorrect DMRS sequence used for decoding. In one aspect (e.g., when receiving PUSCH DMRS 210), incorrect DMRS sequence detection may result in a delayed HARQ transmission. In any of the above aspects, the device may perform unnecessary or
• DMRS sequence detection may improve processing latency—such as system acquisition latency, handover latency, or HARQ retransmission delay, among other processes— at the device.
• the device may include protection within a data payload 215 to improve the reliability of correctly decoding the data payload 215.
• the data payload 215 may include error correcting code bits, such as CRC bits 230.
• the device may determine K CRC bits 230 by performing a CRC computation on the bits in the data payload 215 containing information.
• the data payload 215 may include N2 signaling information bits 220-b, as well as M other information bits 225.
• the K CRC bits 230 may be based on both of these sets of information bits (e.g., the N2 bits and the M bits).
• a DMRS 210 may not contain similar CRC bits to improve reliability of determining the Nl signaling information bits 220-a.
• the device may modify the CRC bits 230 within the data payload 215 to additionally include information about the corresponding DMRS 210. For example, the device may alter the CRC computation or the resulting CRC bit sequence for the payload 215 further based on the Nl signaling information bits 220-a transmitted in the associated DMRS 210. In this way, a receiver may use the CRC bits 230 in the data payload 215 to further improve detection of the corresponding DMRS sequence.
• the device may implement a static or dynamic CRC configuration design.
• a static CRC configuration design the device may implement a same CRC determination process for all scenarios.
• the device may perform a CRC computation on the Nl signaling information bits 220-a, the N2 signaling information bits 220-b, and the M other information bits 225.
• the device may perform the CRC computation on the N2 signaling information bits 220-b and the M other information bits 225 to obtain a set of preliminary CRC bits, and may perform a masking function on the preliminary CRC bits based on the Nl signaling information bits 220-a.
• the device may implement one such implementation.
• the device may semi-statically switch between implementations for determining the CRC bits 230. For example, the device may switch between implementations based on the number of Nl bits, N2 bits, M bits, K bits, or some combination of these bits to transmit. In a specific example, the device may determine threshold numbers of Nl signaling information bits 220-a in relation to K CRC bits 230, and may switch based on these threshold numbers. Below a certain threshold of Nl bits, the device may implement the CRC computation design, and above the threshold the device may implement the CRC masking design. For example, if the number of Nl bits is greater than half the number of K bits, but less than the total number of K bits, the device may select the masking implementation. Otherwise, the device may select the computation implementation.
• the device may perform scrambling to improve protection for the DMRS signaling information bits 220-a. For example, the device may determine a scrambling code based on the Nl signaling information bits 220-a in the DMRS 210. The device may scramble some or all of the bits in the data payload 215 based on this scrambling code. For example, the device may scramble the N2 signaling information bits 220-b, the M other information bits 225, the K CRC bits 230, any other bits in the data payload 215 (e.g., other redundancy bits), or some combination of these sets of bits. A device may receive the DMRS 210 and the scrambled data payload 215.
• DMRS 305 secondary synchronization signal (SSS) transmission 320, or some combination of these transmissions.
• SSS secondary synchronization signal
• Many other RE mapping formats may be used for the transmission of DMRS 305.
• a UE 115 may transmit DMRS 305 on the uplink or a base station 105 may transmit DMRS 305 on the downlink.
• the UE 115 or base station 105 may additionally transmit a primary synchronization signal (PSS) 315, a secondary synchronization signal (SSS) 320, or both.
• PSS primary synchronization signal
• SSS secondary synchronization signal
• the PSS 315, SSS 320, or both may be transmitted over a different bandwidth than the bandwidth allocated for the PBCH 310.
• the PBCH 310 may span a first bandwidth 325 while the PSS 315 and SSS 320 may span a second bandwidth 330, which may be a smaller bandwidth.
• the first bandwidth 325 may span 288 resource elements (REs), while the second bandwidth 330 may span 127 REs.
• the UE or base station may leave a buffer on either end of the second bandwidth 330 where no signal is transmitted.
• REs resource elements
• FIG. 4 illustrates an example of a CRC computation process with DMRS signaling information 400 that supports providing protection for information delivered in DMRS in accordance with various aspects of the present disclosure.
• the CRC computation process with DMRS signaling information 400 may illustrate one possible design for improving reliability of DMRS signaling information.
• the process may show a UE, such as UE 115-b, generating the DMRS and data payload, and transmitting the DMRS and data payload on an uplink communication link 405 to base station 105-b.
• the CRC computation process with DMRS signaling information 400 may apply in the downlink as well.
• base station 105-b may perform the transmitter side processes
• UE 115-b may perform the receiver side processes.
• the CRC computation may be an example of a systematic cyclic code, a polynomial division algorithm, a shift register based division algorithm, or any similar functions for determining a set of CRC bits based on a set of input bits (e.g., in this aspect, the Nl bits, the N2 bits, and the M bits).
• the CRC computation at 410 may result in K CRC bits, which UE 115-b may attach or append to the data payload at 415.
• UE 115-b may transmit the DMRS and the payload to base station 105-b (e.g., using a format such as the one described with reference to FIG. 3) on the uplink communication link 405, which may be an example of a physical data channel.
• Base station 105-b may receive the DMRS and the data payload, and may perform a set of receiver side functions in order to determine the information carried in the DMRS and the data payload.
• Base station 105-b may detect Nl signaling information bits based on the DMRS at 420. Additionally, base station 105-b may decode N2 additional signaling information bits, as well as M other information bits, based on the data payload received over the physical data channel at 425.
• base station 105-b may perform CRC verification on the detected and decoded bits. For example, base station 105-b may perform a CRC function on the Nl, N2, and M bits in order to determine an expected value for the set of CRC bits attached to the data payload.
• base station 105-b may compare the expected set of CRC bits to the actual received set of CRC bits. If the expected and received sets of CRC bits match, the CRC may pass and base station 105-b may determine that the signaling information in the DMRS and the signaling and other information in the data payload were detected and decoded correctly. If the expected set of CRC bits is different than the received set of CRC bits, the CRC may fail, and base station 105-b may determine that the signaling information in the DMRS, the signaling and other information in the data payload, or a combination of the two was incorrectly detected or decoded. In this way, the CRC bits included in the data payload may check not only the accuracy of the information contained in the data payload, but also the accuracy of information detected in the DMRS transmission.
• FIG. 5 illustrates an example of a CRC masking process with DMRS signaling information 500 that supports providing protection for information delivered in DMRS in accordance with various aspects of the present disclosure.
• the CRC masking process with DMRS signaling information 500 may illustrate one possible design for improving reliability of DMRS signaling information.
• the process may show a UE, such as UE 115-c, generating the DMRS and data payload, and transmitting the DMRS and data payload on an uplink communication link 505 to base station 105-c.
• the CRC masking process with DMRS signaling information 500 may apply in the downlink as well.
• base station 105-c may perform the transmitter side processes
• UE 115-c may perform the receiver side processes.
• UE 115-c may perform a set of transmitter side processes to protect DMRS signaling information.
• the DMRS signaling information may be included in Nl bits within a DMRS. Further signaling information may be included in N2 bits included in a data payload. However, in some examples, the data payload may not include any further signaling information bits. Additionally, the data payload may include M other information bits.
• UE 115-c may perform a CRC computation at 510 on the N2 bits and the M bits. The CRC computation at 510 may result in K CRC bits, which may be referred to as preliminary CRC bits.
• UE 115-c may perform a masking process on the preliminary CRC bits at 515.
• the masking process may be based on the Nl signaling information bits transmitted in the DMRS.
• the resulting masked CRC bits are based on both the Nl signaling information bits from the DMRS and the N2 and M information bits from the data payload.
• UE 115-c may attach the masked CRC bits to the data payload at 520. With the masked CRC bits included in the data payload, UE 115-c may transmit the DMRS and the payload to base station 105-c on the uplink communication link 505, which may be an example of a physical data channel.
• Base station 105-c may receive the DMRS and the data payload, and may perform a set of receiver side functions in order to determine the information carried in the DMRS and the data payload.
• Base station 105-c may detect Nl signaling information bits based on the DMRS at 525. Additionally, base station 105-c may decode N2 additional signaling information bits, as well as M other information bits, based on the data payload received over the physical data channel at 530.
• base station 105-b may perform CRC verification on the detected and decoded bits.
• base station 105-c may first perform a function (e.g., an inverse masking function) on the received masked CRC bits based on the detected Nl signaling information bits in the DMRS.
• Base station 105-c may additionally perform a CRC function on the decoded N2 additional signaling information bits and M other information bits in the data payload to obtain an expected un-masked set of CRC bits.
• base station 105-c may compare the expected un-masked set of CRC bits to the output of the function (e.g., the inverse masking function).
• the CRC may pass and base station 105-c may determine that the signaling information in the DMRS and the signaling and other information in the data payload were detected and decoded correctly. If the expected un-masked CRC bits are different than the output of the function, the CRC may fail, and base station 105-c may determine that the signaling information in the DMRS, the signaling and other information in the data payload, or a combination of the two was incorrectly detected or decoded. In this way, the masked CRC bits included in the data payload may check not only the accuracy of the information contained in the data payload, but also the accuracy of information detected in the DMRS transmission.
• FIG. 6 illustrates an example of a potential CRC masking function 600 that supports providing protection for information delivered in DMRS in accordance with various aspects of the present disclosure.
• the potential CRC masking function 600 may be performed at 515 by a transmitting device—such as a base station or a UE— as described with reference to FIG. 5. While FIG. 6 illustrates a potential CRC masking function 600, a transmitting device may implement other CRC masking functions in order to provide protection within a data payload for information in a DMRS.
• a device may perform a CRC computation at 605, using N2 signaling information bits and M other information bits from a data payload as inputs.
• the CRC computation may output a preliminary set of CRC bits, which may be referred to as a P array 610.
• the P array 610 may contain K total bits, which may be the same number of bits as the device has allocated for CRC bits in the data payload.
• the device may mask the preliminary set of CRC bits based on Nl signaling information bits 625 from a DMRS.
• the device may utilize a lookup table 620.
• the lookup table may include all possible values for the Nl signaling information bits 625, and corresponding X arrays 630.
• the X arrays 630 may be examples of distinct sets of bits also of length K.
• the device may implement a projecting function to project each value of Nl signaling information bits 625 onto an array of K bits.
• the device may convert the signaling information contained in the DMRS into a set of bits (e.g., an X array 630, which may be referred to as masking bits) equal in size to the preliminary set of CRC bits (e.g., the P array 610).
• a set of bits e.g., an X array 630, which may be referred to as masking bits
• the preliminary set of CRC bits e.g., the P array 610.
• the device may perform an operation based on the P array 610 and the X array 630 to calculate a Y array 635 of masked CRC bits.
• the device may perform an elementwise exclusive or (XOR) function on the P array 610 and the X array 630.
• the device may perform an XOR function on the pO and xO indices of the P array 610 and the X array 630, respectively, and may assign the result of the function to the yO index of the Y array 635.
• the device may apply this same process to the other indices of the P array 610 and the X array 630 to compute the remaining indices of the resulting Y array 635.
• the device may attach the computed masked CRC bits of the Y array 635 to the data payload for transmission.
• a device receiving the data payload and a corresponding DMRS may detect Nl signaling information bits 625 within the DMRS, and may similarly decode the N2 and M bits of the data payload. The receiving device may then select an expected X array 630 based on the detected Nl signaling information bits 625 and an expected P array 610 based on the decoded N2 and M bits, and may perform an elementwise XOR function on the expected arrays to determine an expected Y array 635. The receiving device may compare the expected Y array 635 to the masked CRC bits received in the data payload to verify the detected and decoded information.
• FIG. 7 illustrates an example of a process flow 700 that supports providing protection for information delivered in DMRS in accordance with various aspects of the present disclosure.
• the process flow 700 may include a base station 105-d and UE 115-d, which may be examples of the corresponding devices described with reference to FIGs. 1 and 2.
• the process flow 700 may illustrate a DMRS transmission on the downlink, but the same processes may apply to uplink DMRS transmissions as well.
• the transmitting device may identify a set of reference signal bits associated with a DMRS transmission.
• the set of reference signal bits may include a first subset of reference signal bits to be conveyed with the DMRS transmission and a second subset of reference signal bits to be conveyed with the data transmission.
• base station 105-d may identify a set of data bits associated with a data transmission.
• Base station 105-d may identify the set of data bits before or at the same time as the set of reference signal bits. Additionally, base station 105-d may identify a scrambling code based on the reference signal bits, and may scramble the data bits based on the scrambling code.
• base station 105-d may calculate a set of CRC bits based on the set of reference signal bits and the set of data bits. In one aspect, base station 105-d may calculate the set of CRC bits based on the first subset of reference signal bits, the second subset of reference signal bits, and the set of data bits. In another aspect, base station 105-d may calculate a subset of the set of CRC bits based on the second subset of reference signal bits and the set of data bits, and may mask the subset of the set of CRC bits using the first subset of reference signal bits.
• base station 105-d may retrieve a bit string based on the first subset of reference signal bits, and may combine the subset of the set of CRC bits with the bit string using an XOR function. Base station 105-d may append the set of CRC bits to the data bits.
• Calculating the set of CRC bits may further include base station 105-d receiving configuration signaling indicating a CRC configuration for calculating the set of CRC bits. Additionally, base station 105-d may switch from a first CRC configuration for calculating the set of CRC bits to a second CRC configuration for calculating the set of CRC bits. In one aspect, this switch may be based on a size of the set of reference signal bits, a size of the set of data bits, a size of the set of CRC bits, or some combination of these sizes.
• base station 105-d may transmit the DMRS transmission and the data transmission with the set of CRC bits to UE 115-d.
• base station 105-d may transmit the first subset of reference signal bits in the DMRS transmission and the second subset of reference signal bits in the data transmission.
• Base station 105-d may transmit the data transmission using a physical data channel, and may transmit the DMRS transmission using resources reserved for DMRS transmissions.
• the DMRS transmission may convey phase reference information associated with the physical data channel.
• UE 115-d may detect the set of reference bits associated with the DMRS transmission. At 730, UE 115-d may decode the set of data bits associated with the data transmission. Additionally, UE 115-d may receive the set of CRC bits with the data transmission.
• UE 115-d may perform a CRC verification process based on the set of CRC bits. UE 115-d may determine whether or not the CRC verification is successful based on the detected set of reference signal bits and the decoded set of data bits.
• FIG. 8 illustrates an example of a process flow 800 that supports providing protection for information delivered in DMRS in accordance with various aspects of the present disclosure.
• the process flow 800 may include a base station 105-e and UE 115-e, which may be examples of the corresponding devices described with reference to FIGs. 1 and 2.
• the process flow 800 may illustrate a DMRS transmission on the downlink, but the same processes may apply to uplink DMRS transmissions as well.
• the transmitting device e.g., in this example, base station 105-e
• base station 105-e may identify a set of reference signal bits associated with a DMRS transmission.
• base station 105-e may identify a set of data bits associated with a data transmission. In one aspect, base station 105-e may identify the set of data bits before or at the same time as the set of reference signal bits.
• Transceiver 1235 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
• the transceiver 1235 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
• the transceiver 1235 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
• the wireless device may include a single antenna 1240.
• the device may have more than one antenna 1240, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
• I/O controller 1245 may manage input and output signals for device 1205. I/O controller 1245 may also manage peripherals not integrated into device 1205. In some examples, I/O controller 1245 may represent a physical connection or port to an external peripheral. In some examples, I/O controller 1245 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. I/O controller 1245 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In one aspect, I/O controller 1245 may be implemented as part of a processor. In some examples, a user may interact with device 1205 via I/O controller 1245 or via hardware components controlled by I/O controller 1245.
• FIG. 13 shows a diagram of a system 1300 including a device 1305 that supports providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• Device 1305 may be an example of or include the components of wireless device 905, wireless device 1005, or a base station 105 as described above, e.g., with reference to FIGs. 1, 2, 4, 5, 9, and 10.
• Device 1305 may include components for bidirectional voice and data communications including components for transmitting and receiving communications, including base station DMRS protection module 1315, processor 1320, memory 1325, software 1330, transceiver 1335, antenna 1340, network communications manager 1345, and inter-station communications manager 1350. These components may be in electronic communication via one or more buses (e.g., bus 1310).
• Device 1305 may communicate wirelessly with one or more UEs 115.
• Processor 1320 may include an intelligent hardware device, (e.g., a general- purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof).
• processor 1320 may be configured to operate a memory array using a memory controller.
• a memory controller may be integrated into processor 1320.
• Processor 1320 may be configured to execute computer- readable instructions stored in a memory to perform various functions (e.g., functions or tasks supporting providing protection for information delivered in DMRS).
• Memory 1325 may include RAM and ROM.
• the memory 1325 may store computer-readable, computer-executable software 1330 including instructions that, when executed, cause the processor to perform various functions described herein.
• the memory 1325 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
• Software 1330 may include code to implement aspects of the present disclosure, including code to support providing protection for information delivered in DMRS.
• Software 1330 may be stored in a non-transitory computer-readable medium such as system memory or other memory.
• the software 1330 may not be directly executable by the processor but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
• Transceiver 1335 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
• the transceiver 1335 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
• the transceiver 1335 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
• the wireless device may include a single antenna 1340. However, in another aspect, the device may have more than one antenna 1340, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
• Network communications manager 1345 may manage communications with the core network (e.g., via one or more wired backhaul links). For example, the network communications manager 1345 may manage the transfer of data communications for client devices, such as one or more UEs 115.
• Inter-station communications manager 1350 may manage communications with other base station 105, and may include a controller or scheduler for controlling
• inter-station communications manager 1350 may coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission.
• inter-station communications manager 1350 may provide an X2 interface within an Long Term Evolution (LTE)/LTE-A wireless communication network technology to provide communication between base stations 105.
• LTE Long Term Evolution
• LTE-A Long Term Evolution
• the UE 115 or base station 105 may identify a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission.
• the set of reference signal bits comprises a first subset of reference signal bits that are conveyed with the DMRS transmission and a second subset of reference signal bits that are conveyed with the data transmission.
• the operations of block 1505 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1505 may be performed by an identification component as described with reference to FIGs. 9 through 12.
• the UE 115 or base station 105 may calculate a set of CRC bits based at least in part on both the set of reference signal bits and the set of data bits.
• the operations of block 1515 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1515 may be performed by a CRC component as described with reference to FIGs. 9 through 12.
• the UE 115 or base station 105 may transmit the DMRS transmission and the data transmission with the set of CRC bits.
• the operations of block 1530 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1530 may be performed by a transmitter as described with reference to FIGs. 9 through 12.
• the UE 115 or base station 105 may identify a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data transmission.
• the set of reference signal bits comprises a first subset of reference signal bits that are conveyed with the DMRS transmission and a second subset of reference signal bits that are conveyed with the data transmission.
• the operations of block 1605 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1605 may be performed by an identification component as described with reference to FIGs. 9 through 12.
• the UE 115 or base station 105 may calculate a set of CRC bits based at least in part on the first subset of reference signal bits, the second subset of reference bits, and the set of data bits.
• the operations of block 1615 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1615 may be performed by a CRC component as described with reference to FIGs. 9 through 12.
• the UE 115 or base station 105 may transmit the DMRS transmission and the data transmission with the set of CRC bits.
• the operations of block 1625 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1625 may be performed by a transmitter as described with reference to FIGs. 9 through 12.
• FIG. 17 shows a flowchart illustrating a method 1700 for providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• the operations of method 1700 may be implemented by a UE 115 or base station 105 or its components as described herein.
• the operations of method 1700 may be performed by a DMRS protection module as described with reference to FIGs. 9 through 12.
• a UE 115 or base station 105 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 or base station 105 may perform aspects of the functions described below using special-purpose hardware.
• the UE 115 or base station 105 may detect a set of reference signal bits associated with a DMRS transmission.
• the operations of block 1705 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1705 may be performed by a detection component as described with reference to FIGs. 9 through 12.
• the UE 115 or base station 105 may decode a set of data bits associated with a data transmission.
• the operations of block 1710 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1710 may be performed by a decoder as described with reference to FIGs. 9 through 12.
• the UE 115 or base station 105 may receive a set of CRC bits with the set of data bits.
• the operations of block 1715 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1715 may be performed by a CRC verification component as described with reference to FIGs. 9 through 12.
• the UE 115 or base station 105 may perform a CRC verification process based at least in part on the set of CRC bits, wherein the set of CRC bits is computed based at least in part on both the set of reference signal bits and the set of data bits.
• the operations of block 1720 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1720 may be performed by a CRC verification component as described with reference to FIGs. 9 through 12.
• FIG. 18 shows a flowchart illustrating a method 1800 for providing protection for information delivered in DMRS in accordance with aspects of the present disclosure.
• the operations of method 1800 may be implemented by a UE 115 or base station 105 or its components as described herein.
• the operations of method 1800 may be performed by a DMRS protection module as described with reference to FIGs. 9 through 12.
• a UE 115 or base station 105 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 or base station 105 may perform aspects of the functions described below using special-purpose hardware.
• the UE 115 or base station 105 may scramble the set of data bits based at least in part on the identified scrambling code.
• the operations of block 1815 may be performed according to the methods described herein. In certain examples, aspects of the operations of block 1815 may be performed by a scrambling component as described with reference to FIGs. 9 through 12.
• a UE 115 or base station 105 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 or base station 105 may perform aspects of the functions described below using special -purpose hardware.
• the UE 115 or base station 105 may detect a set of reference signal bits associated with a DMRS transmission and a set of data bits associated with a data
• the UE 115 or base station 105 may descramble the set of data bits based on the identified scrambling code.
• the operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed by a scrambling component as described with reference to FIGs. 9 through 12.
• the UE 115 or base station 105 may fail when scrambling the set of data bits when the identified scrambling code is incorrect. For example, when a UE 115 incorrectly decodes the DMRS, the decoding of the data channel would automatically fail.
• CDMA code division multiple access
• TDMA time division multiple access
• FDMA frequency division multiple access
• OFDMA orthogonal frequency division multiple access
• SC-FDMA single carrier frequency division multiple access
• CDMA code division multiple access
• TDMA time division multiple access
• FDMA frequency division multiple access
• OFDMA orthogonal frequency division multiple access
• SC-FDMA single carrier frequency division multiple access
• CDMA code division multiple access
• TDMA time division multiple access
• FDMA frequency division multiple access
• OFDMA orthogonal frequency division multiple access
• SC-FDMA single carrier frequency division multiple access
• a code division multiple access (CDMA) system may implement a radio technology such as
• CDMA2000 Universal Terrestrial Radio Access (UTRA), etc.
• CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
• IS-2000 Releases may be commonly referred to as CDMA2000 IX, IX, etc.
• IS-856 (TIA-856) is commonly referred to as CDMA2000 lxEV-DO, High Rate Packet Data (HRPD), etc.
• UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
• a TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM).
• GSM Global System for Mobile Communications
• 3GPP Third Generation Partnership Project
• CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).
• 3GPP2 3rd Generation Partnership Project 2
• the techniques described herein may be used for the systems and radio technologies mentioned above as well as other systems and radio technologies. While aspects of an LTE or an NR system may be described for purposes of example, and LTE or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE or NR applications.
• the term evolved node B may be generally used to describe the base stations.
• the wireless communications system or systems described herein may include a heterogeneous LTE/LTE- A or NR network in which different types of eNBs provide coverage for various geographical regions.
• each eNB, next generation NodeB (gNB), or base station may provide communication coverage for a macro cell, a small cell, or other types of cell.
• the term "cell” may be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., sector, etc.) of a carrier or base station, depending on context.
• a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
• a small cell is a lower-powered base station, as compared with a macro cell, that may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency bands as macro cells.
• Small cells may include pico cells, femto cells, and micro cells according to various examples.
• a pico cell for example, may cover a small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
• a femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in the home, and the like).
• An eNB for a macro cell may be referred to as a macro eNB.
• An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB.
• An eNB may support one or multiple (e.g., two, three, four, and the like) cells (e.g., component carriers).
• the wireless communications system or systems described herein may support synchronous or asynchronous operation.
• the base stations may have similar frame timing, and transmissions from different base stations may be
• the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time.
• the techniques described herein may be used for either synchronous or asynchronous operations.
• the downlink transmissions described herein may also be called forward link transmissions while the uplink transmissions may also be called reverse link transmissions.
• each carrier may be a signal made up of multiple sub-carriers (e.g., waveform signals of different frequencies).
• Information and signals described herein may be represented using any of a variety of different technologies and techniques.
• data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
• a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
• a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).
• the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
• Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
• a non-transitory storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.
• non-transitory computer-readable media may comprise RAM, ROM, electrically erasable programmable read only memory (EEPROM), compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general- purpose or special-purpose computer, or a general-purpose or special-purpose processor.
• RAM random access memory
• ROM read only memory
• EEPROM electrically erasable programmable read only memory
• CD compact disk
• magnetic disk storage or other magnetic storage devices or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures

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