US20140056244A1 - A Node and Method for Downlink Communications Scheduling - Google Patents

A Node and Method for Downlink Communications Scheduling Download PDF

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Publication number
US20140056244A1
US20140056244A1 US13/981,847 US201313981847A US2014056244A1 US 20140056244 A1 US20140056244 A1 US 20140056244A1 US 201313981847 A US201313981847 A US 201313981847A US 2014056244 A1 US2014056244 A1 US 2014056244A1
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Prior art keywords
pdsch
ofdm
start symbol
message
downlink
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Mattias Frenne
Daniel Larsson
Lars Lindbom
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Priority to US13/981,847 priority Critical patent/US20140056244A1/en
Assigned to TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) reassignment TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LINDBOM, LARS, FRENNE, MATTIAS, LARSSON, DANIEL
Publication of US20140056244A1 publication Critical patent/US20140056244A1/en
Priority to US15/224,149 priority patent/US11184913B2/en
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    • 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
    • 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
    • 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
    • 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
    • H04L5/0078—Timing of allocation
    • 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
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • Example embodiments presented herein are directed towards a base station, and corresponding methods therein, for providing a Orthogonal Frequency Division Multiplexing (OFDM) Physical Downlink Shared Channel (PDSCH) start symbol for a wireless terminal which monitors an enhanced Physical Downlink Control Channel (ePDCCH) for obtaining downlink control data.
  • Example embodiments are also presented for the wireless terminal, and corresponding methods therein, for obtaining the OFDM PDSCH start symbol and for receiving downlink broadcast transmissions based on the OFDM PDSCH start symbol.
  • OFDM Orthogonal Frequency Division Multiplexing
  • ePDCCH enhanced Physical Downlink Control Channel
  • LTE Long Term Evolution
  • OFDM Orthogonal Frequency Division Multiplexing
  • DFT Discrete Fourier Transform
  • the basic LTE downlink physical resource can thus be seen as a time-frequency grid as illustrated in FIG. 1 , where each resource element corresponds to one OFDM subcarrier during one OFDM symbol interval.
  • resource allocation in LTE is typically described in terms of resource blocks, where a resource block corresponds to one slot (0.5 ms) in the time domain and 12 subcarriers in the frequency domain. Resource blocks are numbered in the frequency domain, starting with 0 from one end of the system bandwidth.
  • Downlink transmissions are dynamically scheduled, i.e., in each subframe the base station transmits control information about to which user equipments data is transmitted and upon which resource blocks the data is transmitted, in the current downlink subframe.
  • This control signaling is typically transmitted in the first 1, 2, 3 or 4 OFDM symbols in each subframe.
  • the number 1, 2, 3 or 4 is known as the Control Format Indicator (CFI) indicated by the Physical CFI Channel (PCHICH) transmitted in the first symbol of the control region.
  • the control region also comprises Physical Downlink Control Channels (PDCCH) and possibly Physical HARQ Indication Channels (PHICH) carrying ACK/NACK for uplink transmissions.
  • the region of the remaining 14-n OFDM symbols in the subframe is denoted the shared data channel region and it comprises the Physical Downlink Shared Channel (PDSCH).
  • PDSCH Physical Downlink Shared Channel
  • the downlink subframe also comprises Common Reference Symbols (CRS), which are known to the receiver and used for coherent demodulation of, for example, the control information.
  • CRS Common Reference Symbols
  • the PDCCH is used to carry downlink control information (DCI) such as scheduling decisions and power-control commands.
  • DCI downlink control information
  • the DCI comprises downlink scheduling assignments.
  • the downlink scheduling assignments comprise PDSCH resource indication, transport format, hybrid-ARQ information, and control information related to spatial multiplexing (if applicable).
  • a downlink scheduling assignment also comprises a command for the power control of the Physical Uplink Control Channel (PUCCH) used for the transmission of hybrid-ARQ acknowledgements in response to downlink scheduling assignments.
  • PUCCH Physical Uplink Control Channel
  • the DCI also comprises uplink scheduling grants.
  • the uplink scheduling grants comprise Physical Uplink Shared Channel (PUSCH) resource indications, transport format information, and hybrid-ARQ-related information.
  • An uplink scheduling grant also comprises a command for the power control of the PUSCH.
  • the DCI further comprises power-control commands for a set of terminals as a complement to the commands comprised in the scheduling assignments/grants.
  • One PDCCH carries one DCI message with one of the formats described above.
  • multiple terminals can be scheduled simultaneously, on both downlink and uplink transmissions, there must be a possibility to transmit multiple scheduling messages within each subframe.
  • Each scheduling message is transmitted on a separate PDCCH, and consequently there are typically multiple simultaneous PDCCH transmissions within each cell.
  • link adaptation can be used, where the code rate of the PDCCH is selected to match the radio-channel conditions.
  • Heterogeneous networks have recently attained a large amount of interest within the mobile cellular industry and are regarded by operators and many vendors as the deployment needed to meet high user experiences in mobile broadband.
  • Heterogeneous networks can be characterized as deployments with a mixture of cells of differently sized and overlapping coverage areas.
  • One example of such a network is where pico cells are deployed within the coverage area of a macro cell, as illustrated in FIG. 4 .
  • a pico cell is a small cellular base station transmitting with low output power and typically covers a much smaller geographical area than a macro base station.
  • Heterogeneous networks represent an alternative to the densification of macro networks, and have classically been considered in cellular networks with traffic hotspots as a deployment method for increasing network capacity.
  • small cells covering the traffic hotspot can off-load the macro cell and thus improve both capacity and the overall data throughput within the coverage area of the macro cell.
  • emerging mobile broadband applications there is however a continuous demand for higher data rates and therefore it is of interest to deploy low power nodes, not necessarily to only cover traffic hotspots, but also at locations within the macro cell coverage where the signal-to-noise ratio prevents high data rates.
  • UE User equipments attached to cellular networks continuously monitor which cell they shall be associated with. This monitoring is typically conducted by evaluating the radio reception quality of its serving cell (current association) against radio reception quality of neighbor cells. If the radio reception quality of a neighbor cell is better than the serving cell, a new cell association will be established for the user equipment.
  • the procedures for changing cell association depend on which of the two RRC states, RRC_IDLE and RRC_CONNECTED, the user equipment is within.
  • the Radio Access Network RAN
  • cell association decisions are usually based on mobility measurement reports provided by the user equipment.
  • Mobility measurement reports refer to measured Reference Signal Received Power (RSRP), or Reference Signal Received Quality (RSRQ), in units of dB.
  • a user equipment may be connected to the cell with the strongest received power, for example RSRP, the cell with the best path gain, or a combination of the two.
  • RSRP received power
  • a user equipment may be connected to the cell with the strongest received power, for example RSRP, the cell with the best path gain, or a combination of the two.
  • RSRP received power
  • These different cell association principles do not typically result in the same selected cell when the base station output powers of cells differ. This is sometimes referred to as link imbalance.
  • the output power of a pico base station is in the order of 30 dBm or less, while a macro base station may have an output power of 46 dBm. Consequently, even in the proximity of the pico cell, the downlink signal strength from the macro cell may be larger than that of the pico cell.
  • 3GPP LTE release 10 specified new ICIC features for enabling reliable operations in the cell range expansion zone of pico users in a connected mode up to offsets of 6 dB, for example, pico cell range of RSRP+6 dB.
  • This new ICIC feature is sometimes referred to as enhanced ICIC and provides specification of signaling support for time domain based ICIC.
  • a user equipment receiving data has to first detect the physical layer control information in order to know which resource blocks comprises the data intended for that user as well as other information required to demodulate the received data.
  • the user equipment needs to monitor the physical layer control transmissions in all subframes.
  • FIG. 6 The principle of time domain ICIC is illustrated in FIG. 6 .
  • an interfering macro cell avoids scheduling data to macro users in certain subframes, in order to create protected radio resources for the pico cell.
  • the macro eNB indicates via the LTE backhaul X 2 interface to the neighbor pico eNB which subframes it intends to not schedule users within.
  • the pico eNB can then take this information into account when scheduling users operating within the cell range expansion zone; such that these users are prioritized to be scheduled in protected subframes, for example, low interference subframes. Users operating near the pico eNB may in principle be scheduled in all subframes.
  • time domain ICIC assumes that pico cells are time synchronized to the macro cell, as a prerequisite for creating protected subframes.
  • system information is broadcasted in each cell and comprises information needed for the user equipment to both access the cell and properly operate within cell.
  • system information is structured into one Master Information Block (MIB) and thirteen System Information Blocks (SIBs), referring to SIB1 to SIB13.
  • MIB Master Information Block
  • SIBs System Information Blocks
  • SIBs are schedulable in both time and frequency (SIB2 to SIB13), or in frequency only (SIB1).
  • FIG. 7 illustrates where the transmissions of MIB and SIB1 occur in a time synchronized heterogeneous network.
  • the MIB is transmitted in subframe #0 of the LTE radio frame and the SIB1 is transmitted in subframe #5 of every even radio frame.
  • the MIB transmission in the macro cell interferes with the MIB transmission in the pico cell.
  • the SIB1 transmissions but in this case there is a possibility to coordinate data transmissions in the frequency domain.
  • the physical layer control signaling of the SIB1 transmissions cannot be coordinated across the macro and the pico cells.
  • the physical layer control part of the macro SIB1 transmissions will interfere with the corresponding physical control transmissions of SIB1 in the pico cell.
  • SIB2 to SIB13 transmissions are schedulable in both time and frequency, it is possible ensure that these system information blocks are scheduled in protected subframes only.
  • a user equipment in RRC_CONNECTED state is notified by its serving base station (eNB) about changes in the system information either via a paging message or via a counter in the SIB1 that is incremented every time the system information has been changed.
  • eNB serving base station
  • a user equipment receiving a system change notification via paging acquires system information by first reading the SIB1. Due to potentially very high macro interference towards physical layer broadcast channels carrying MIB and SIB1 for a pico user in the cell range expansion zone, detection of paging messages (sent in cell configured paging occasions), random access responses, or SIB1 transmissions may not be possible.
  • a mobile terminal may need to contact the network (via the eNodeB) without having a dedicated resource in the Uplink (from user equipment to base station).
  • a random access procedure is available where a user equipment that does not have a dedicated UL resource may transmit a signal to the base station.
  • the first message of this procedure is typically transmitted on a special resource reserved for random access, a Physical Random Access Channel (PRACH).
  • PRACH Physical Random Access Channel
  • This channel can for instance be limited in time and/or frequency (as in LTE).
  • An example of a random access preamble transmission is illustrated in FIG. 8 .
  • the resources available for PRACH transmissions are provided to the terminals as part of the broadcasted system information in system information block 2 (SIB-2) (or as part of dedicated RRC signaling in case of, for example, handover).
  • the resources comprise a preamble sequence and a time/frequency resource.
  • In each cell there are 64 preamble sequences available. Two subsets of the 64 sequences are defined, where the set of sequences in each subset is signaled as part of the system information.
  • the terminal selects at random one sequence in one of the subsets. As long as no other terminal is performing a random-access attempt using the same sequence at the same time instant, no collisions will occur and the attempt will, with a high likelihood, be detected by the eNodeB.
  • the random access procedure may be used for a number of different reasons. Among these reasons are initial access (e.g., for UEs in the RRC_IDLE state), incoming handover, resynchronization of the UL, scheduling request (e.g., for a UE that has not allocated any other resource for contacting the base station), and positioning.
  • the contention-based random access procedure used in LTE Rel-10 is illustrated in FIG. 9 .
  • the user equipment starts the random access procedure by randomly selecting one of the preambles available for contention-based random access.
  • the user equipment transmits the selected random access preamble on the Physical Random Access Channel (PRACH) to eNodeB in RAN.
  • PRACH Physical Random Access Channel
  • the RAN acknowledges any preamble it detects by transmitting a random access response (MSG2) comprising an initial grant to be used on the uplink shared channel, a temporary C-RNTI (TC-RNTI), and a time alignment (TA) update based on the timing offset of the preamble measured by the eNodeB on the PRACH.
  • MSG2 is transmitted in the DL to the user equipment using the PDSCH and its corresponding PDCCH message that schedules the PDSCH comprises a cyclic redundancy check (CRC) which is scrambled with the RA-RNTI.
  • CRC cyclic redundancy check
  • an enhanced PDCCH (ePDCCH) is introduced which is based on user equipment specific reference signals and is localized in frequency as opposed to the PDCCH which spans the whole bandwidth.
  • ePDCCH enhanced PDCCH
  • a subset of the available RB pairs in a subframe is configured to be used for ePDCCH transmissions.
  • a benefit of using user equipment specific precoding is that precoding gains may also be achieved for control channels.
  • Another benefit is that different RB pairs for ePDCCH may be allocated to different cells or different points within a cell. Thereby, intercell interference coordination between control channels may be achieved. This frequency coordination is not possible with the PDCCH since the PDCCH spans the whole bandwidth.
  • FIG. 10 shows an ePDCCH which, similarly to the CCE in the PDCCH, is divided into multiple eCCE and mapped to one of the enhanced control regions, for example, mapped to one PRB pair reserved for ePDCCH transmission.
  • the enhanced control channel enables user equipment specific precoding and such localized transmission as illustrated in FIG. 10 , it may in some cases be useful to be able to transmit an enhanced control channel in a broadcasted, wide area coverage fashion. This is useful if the eNB does not have reliable information to perform precoding towards a certain user equipment. Then a wide area coverage transmission is more robust, although the precoding gain is lost.
  • Another case is when the particular control message is intended for more than one user equipment(s). In this case, user equipment specific precoding cannot be used.
  • An example of this case is the transmission of common control information as in the PDCCH, for example, in the common search space.
  • SIB system information blocks
  • random access responses and paging will be scheduled from the common search space of the ePDCCH.
  • sub-band precoding may be utilized. Since the user equipment estimates the channel in each RB pair individually, the eNB can choose different precoding vectors in the different RB pairs, if the eNB has such information that the preferred precoding vectors are different in different parts of the frequency band. In any of these cases, a distributed transmission may be used, as illustrated in FIG. 11 , where the eREG belonging to the same ePDCCH are distributed over the enhanced control regions.
  • a user equipment may be configured to monitor its control channel in the ePDCCH instead of the PDCCH. Hence, both its UE specific search space (USS) and its common search space (CSS) are monitored in the ePDCCH resources. Alternatively, a user equipment may monitor the USS in the ePDCCH and the CSS in PDCCH.
  • USS UE specific search space
  • CSS common search space
  • MTC machine type communication user equipments
  • a user equipment may use a start symbol for the PDSCH that carries the broadcast message.
  • the start symbol aids in identifying the start of downlink broadcast transmissions in a channel. This start symbol may be obtained via downlink control data.
  • different user equipments may monitor different channels for receiving downlink control data. As a result, the different user equipment may not be able to receive the same broadcast transmission on the same PDSCH channel.
  • Some of the example embodiments presented herein are directed towards providing a starting OFDM PDSCH start symbol of a PDSCH transmission comprising system information, random access responses or a paging message by means other than using the PCFICH.
  • the network may indicate the same configured value in the PCFICH so that user equipments which are unable to read the PCFICH may decode the same message as user equipments that are able to read the PCFICH.
  • some of the example embodiments may comprise explicit and dynamic signaling of the OFDM PDSCH start symbol in a DCI message (transmitted via ePDCCH). Some of the example embodiments may comprise semi-static signaling via a RRC message (transmitted via PDSCH). Other example embodiments may comprise a pre-defined and fixed OFDM PDSCH start symbol for PDSCH transmissions.
  • An example advantage of the example embodiments presented herein is the ability of allowing a user equipment to receive system information, paging and random access responses in cases of high intercell interference on the control channel.
  • a further example advantage is providing reduced control channel overhead.
  • some of the example embodiments are directed towards a method, in a base station, for scheduling a downlink broadcast transmission using a PDSCH and for providing an OFDM PDSCH start symbol for the broadcast transmissions.
  • the base station is comprised in a wireless communications network.
  • the method comprises providing, to at least one wireless terminal which monitors an ePDCCH for receiving downlink control information, the OFDM PDSCH start symbol.
  • the OFDM PDSCH start symbol is provided in a message transmitted outside of a control region of a subframe, where the control region comprises at least a PDCCH.
  • the OFDM PDSCH start symbol is based on a predefined value.
  • Some of the example embodiments are directed towards a base station for scheduling a downlink broadcast transmission using a PDSCH and for providing an OFDM PDSCH start symbol for the broadcast transmissions.
  • the base station is comprised in a wireless communications network.
  • the base station comprises processing circuitry configured to provide, to at least one wireless terminal which monitors an ePDCCH for receiving downlink control information, the OFDM PDSCH start symbol.
  • the OFDM PDSCH start value is provided in a message transmitted outside of a control region of the subframe, where the control region comprises at least a PDCCH.
  • the OFDM PDSCH start value is based on a predefined value.
  • Some of the example embodiments are directed towards a method in a wireless terminal for receiving downlink broadcast transmissions in a PDSCH.
  • the wireless terminal is comprised in a wireless communications network.
  • the method comprises monitoring an ePDCCH for downlink control information.
  • the method further comprises obtaining an OFDM PDSCH start value for downlink broadcast transmissions.
  • the OFDM PDSCH start symbol is provided in a message transmitted outside of a control region of a subframe, where the control region comprises at least a PDCCH.
  • the OFDM PDSCH start symbol is based on a predefined value.
  • the method also comprises receiving downlink broadcast transmissions on the PDSCH based on the OFDM PDSCH start symbol.
  • Some of the example embodiments are directed towards a wireless terminal for receiving downlink broadcast transmissions in a PDSCH.
  • the wireless terminal is comprised in a wireless communications network.
  • the wireless terminal comprises processing circuitry configured to monitor an ePDCCH for downlink control information.
  • the processing circuitry is also configured to obtain an OFDM PDSCH start symbol for downlink broadcast transmissions.
  • the OFDM PDSCH start value is provided in a message transmitted outside of a control region of a subframe, where the control region comprises at least a PDCCH.
  • the OFDM PDSCH start symbol is based on a predefined value.
  • the wireless terminal further comprises radio circuitry configured to receive downlink broadcast transmissions on the PDSCH based on the OFDM PDSCH start symbol.
  • FIG. 1 is an illustrative example of a LTE downlink physical resource
  • FIG. 2 is a schematic of a LTE time-domain structure
  • FIG. 3 is a depiction of a downlink subframe
  • FIG. 4 is an illustrative example of a heterogeneous network with macro and pico cell deployments
  • FIG. 5 is an illustrative example of cell association criteria in a heterogeneous network
  • FIG. 6 is a depiction of protected subframes, created by a macro cell, at the pico layer;
  • FIG. 7 is an illustrative example of MIB and SIB1 transmissions
  • FIG. 8 is a depiction of a random access preamble transmission
  • FIG. 9 is a schematic of signaling over an air interface for a contention-based random access procedure in LTE.
  • FIGS. 10 and 11 are illustrative examples of CCE mapping in downlink subframes
  • FIG. 12 is an illustrative example of an ePDCCH and PDDCH scheduling
  • FIG. 13 is a messaging diagram providing an overview of the example embodiments presented herein;
  • FIG. 14 is an illustrative example of PDSCH scheduling via a start symbol indicated in a DCI message in the ePDCCH, according to some of the example embodiments;
  • FIG. 15 is a messaging diagram depicting the scheduling of FIG. 14 , according to some of the example embodiments.
  • FIG. 16 is an illustrative example of PDSCH scheduling via a start symbol indicated in a RRC message, according to some of the example embodiments.
  • FIG. 17 is a messaging diagram depicting the scheduling of FIG. 16 , according to some of the example embodiments.
  • FIG. 18 is an example node configuration of a base station, according to some of the example embodiments.
  • FIG. 19 is an example node configuration of a wireless terminal or user equipment, according to some of the example embodiments.
  • FIG. 20 is a flow diagram illustrating example operations which may be taken by the base station of FIG. 18 , according to some of the example embodiments.
  • FIG. 21 is a flow diagram illustrating example operations which may be taken by the user equipment of FIG. 19 , according to some of the example embodiments.
  • SIB-1 In heterogeneous deployments the reception of SIB-1 is in particular problematic as this system information block cannot be scheduled in time. This implies that macro and pico scheduling of the SIB-1 using the related PDCCHs may collide and thus cause severe interference problems for pico cell edge users leading to the SIB-1 being undetectable. Hence, some of the example embodiments also address this scenario by using ePDCCH for broadcasting SIB-1 in CCS for pico cells operating with larger cell range expansion.
  • the OFDM PDSCH start symbol in the subframe may be a user equipment specifically RRC configured parameter to avoid the problem of receiving downlink control information via the PCFICH. This OFDM start symbol is then used for both ePDCCH and PDSCH.
  • the OFDM PDSCH start symbol may be dynamically indicated using the PCFICH, for both ePDCCH and PDSCH but this will only be a robust solution for user equipments that may reliably detect PCFICH and hence do not experience the mentioned interference problem.
  • FIG. 12 illustrates an example where an ePDCCH with a configured start symbol schedules a PDSCH, denoted PDSCH 1.
  • a non-legacy user equipment may use the ePDCCH for receiving downlink control information for receiving downlink broadcast transmissions in PDSCH 1.
  • another user equipment e.g., a legacy user equipment or a pre-release 11 user equipment, which does not have support for ePDCCH reception
  • the legacy user equipment which can receive the PCFICH and the PDCCH will follow the start symbol CFI as indicated in the PCFICH.
  • the two user equipments may have different PDSCH start symbols in the same subframe.
  • the user equipment scheduled using ePDCCH may have much better coverage than the user equipment scheduled by the PDCCH (e.g., the legacy user equipment) since it does not have the mentioned interference problem in the legacy control region.
  • the eNB schedules system information blocks (SIB) transmitted by PDSCH by using the PDCCH and the ePDCCH to reach user equipments which monitors the first or the second control channel for such system information.
  • SIB system information blocks
  • the system information is in 3GPP release 10 broadcasted and scheduled by the PDCCH in the common search space (CSS), with CRC scrambled by SI-RNTI. Since the same PDSCH comprising the SIB is scheduled from both PDCCH and ePDCCH, the OFDM PDSCH start symbol for this PDSCH must be assumed to be the same for both user equipments (e.g., legacy and non-legacy) monitoring PDCCH and ePDCCH, however, such an assumption may not be valid. Furthermore, since the ePDCCH start symbol may be user equipment specifically configured, the two user equipments may have different start symbols configured. This problem is known as start symbol alignment.
  • the eNB also schedules a random access response (RAR message 2, FIG. 9 ), using the RA-RNTI.
  • RAR message 2 which user equipment that transmitted the RA preamble (RAR message 1, FIG. 9 ) is unknown to the eNB, so it does not know which OFDM start symbol should be used for RAR message 2 (since it is user equipment specifically configured), or if the user equipment follows the start symbol indicated in PCFICH to demodulate the PDSCH.
  • RA response messages there is a problem of receiving RA response messages.
  • paging transmissions are also broadcasted and comprise a PDSCH that is scheduled through the common search space using P-RNTI.
  • user equipments in a RRC_IDLE mode may receive paging messages but in this case, the network does not know which eNB the user equipment is synchronized to. Hence, the network does not know whether the user equipment may reliably detect PCFICH or not, or whether the user equipment monitors the ePDCCH or the PDCCH for P-RNTI transmission. If ePDCCH is used to transmit paging, there is no configuration of an OFDM start symbol for user equipments that are in RRC_IDLE mode. It is thus a problem of how to transmit and receive paging messages.
  • Some of the example embodiments presented herein are directed towards OFDM PDSCH start symbol alignment for all user equipments in a cell.
  • the example embodiments solve at least the above mentioned problems by providing the starting OFDM PDSCH start symbol of the PDSCH transmission comprising system information, random access responses or a paging message by other means than using the PCFICH.
  • FIG. 13 provides an overview illustration of the example embodiments presented herein.
  • wireless terminals 505 A which monitor ePDCCH (e.g., non-legacy user equipments) and wireless terminals 505 B which monitor PDCCH (e.g., legacy user equipments) for downlink control data may not be able to receive downlink broadcast transmissions from a same PDSCH.
  • some of the example embodiments presented herein are directed towards providing a wireless terminal, which monitors ePDCCH for downlink control information, an OFDM PDSCH start symbol which will enable both types of wireless terminals to receive the same downlink broadcasts transmissions.
  • a wireless terminal 505 A may monitor ePDCCH for obtaining downlink control information (operation 28).
  • a base station 401 provides an OFDM PDSCH start symbol to the wireless terminal 505 A (operation 10). This start symbol may be provided, for example, via a DCI or RRC message.
  • the wireless terminal 505 A may thereafter obtain the OFDM PDSCH start symbol (operation 30). It should be appreciated that the OFDM PDSCH start symbol need not be transmitted by the base station 401 . According to some of the example embodiments, the OFDM PDSCH start symbol may be based on a predefined value. In some example embodiments, this predefined value may be fixed or may depend on any number of network parameters. An example of such a parameter is a system bandwidth. Thus, there may be any number of predefined symbol values associated with different possible values of a system bandwidth. The wireless terminal 505 A may retrieve such an OFDM PDSCH start symbol via, for example, a table or database.
  • the wireless terminal 505 A may begin to receive downlink broadcast transmissions on the PDSCH (operation 34).
  • Some of the example embodiments may comprise the network indicating the OFDM PDSCH start symbol is the same as the start value configured in the PCFICH so that user equipments that may (e.g., legacy UEs) and user equipments that may not (e.g., non-legacy UEs) read the PCFICH can decode the same message.
  • a wireless terminal 505 B which is configured to read a PDCCH for downlink control information may obtain the OFDM PDSCH start symbol from the PDCCH. Therefore, both wireless terminals 505 A and 505 B may receive the same scheduled downlink broadcast transmissions (example operation 16).
  • FIG. 14 illustrates providing an OFDM PDSCH start symbol via a DCI message provided in ePDCCH, according to some of the example embodiments.
  • the OFDM PDSCH start symbol for the scheduled PDSCH transmission is indicated in the DCI message used to schedule the PDSCH transmission. This has the advantage that a dynamic start symbol which will minimize overhead may be used since the size of the legacy control region may always be adjusted to the required control channel capacity.
  • the indication is performed in the DCI of the ePDCCH transmission by adding additional bits, such as one or two bits, or alternatively by re-using unused bits or code points of an existing DCI message.
  • the indication (or OFDM PDSCH start symbol) in the DCI message may comprise the same CFI (or start symbol supplied by the CFI) that is transmitted by PCFICH. In this way can both terminals (e.g., legacy and non-legacy), each that monitor one of CSS in PDCCH and ePDCCH, may receive the same message scheduled in PDSCH.
  • Such scheduled PDSCH could be a random access response, a transmission of a system information block (SIB), a paging, or any other channel introduced in the future that is of broadcast or unknown recipient nature.
  • SIB system information block
  • Such scheduled PDSCH could also be a normal shared data channel transmission where overhead may be reduced since the ePDCCH start symbol is RRC configured or configured by signaling in the PBCH or ePBCH (i.e., MIB) and thus semi-static, but the OFDM PDSCH start symbol may be dynamic by comprising the start symbol of the PDSCH in the DCI that schedules the PDSCH.
  • unused DAI bits may be reused for such indication of the OFDM start symbol in the DCI message.
  • FIG. 15 illustrates messaging for the signaling of the OFDM PDSCH start symbol as described in FIG. 14 .
  • the CFI start symbol for receiving downlink broadcast transmissions on the PDSCH is provided to a user equipment which monitors PDCCH (e.g., a legacy user equipment) via the PCFICH.
  • PDCCH e.g., a legacy user equipment
  • SI-RNTI e.g., SI-RNTI
  • a non-legacy user equipment which monitors ePDCCH may receive the OFDM PDSCH start symbol in a DCI message transmitted via ePDCCH.
  • both the user equipment which monitors ePDCCH for downlink control information, as well as the user equipment which monitors the PDCCH may receive same downlink broadcast transmissions starting at the provided start symbol.
  • FIG. 16 illustrates providing an OFDM PDSCH start symbol via RRC messaging, according to some of the example embodiments.
  • An first RRC configured value is used as the OFDM start symbol for PDSCH transmissions of system information, paging and random access responses.
  • This RRC configured value may be different than a second RRC configured value used when scheduling a PDSCH transmission using ePDCCH or PDCCH via C-RNTI.
  • the second RRC configured value if used, determines the start position of PDSCH (when scheduled using C-RNTI) and may also indicate the start value for the ePDCCH. In this case, when detecting ePDCCH, the user equipment may use the second RRC configured value to detect the ePDCCH.
  • the ePDCCH comprises a scheduling of a broadcast message
  • it will use the first RRC configured value as the start value for the PDSCH comprising the broadcast message.
  • the second value is the aligned among all user equipments that receive the broadcast message, while the first value could be any user equipment specifically RRC configured value.
  • the user equipment may be configured with the OFDM start symbol by reading PBCH or ePBCH of the serving cell, or configured with the value from a RRC message transmitted within a SIB transmitted from the serving cell.
  • the user equipment may be configured to receive the OFDM PDSCH start symbol in a user equipment dedicated RRC message by the serving cell or in a handover command. It is further possible that the user equipment be configured with any number of options, in any combination, described herein.
  • the CFI start value indicated in the PCFICH may be set to be equal to the first RRC configured value so that the same PDSCH start symbol may be assumed for user equipments that can or are configured to read the PCFICH and user equipments that rely on the RRC configured OFDM start symbol for receiving downlink broadcast transmissions the PDSCH.
  • FIG. 17 illustrates a messaging diagram for providing the OFDM PDSCH start symbol via RRC messaging.
  • user equipments which monitor ePDCCH may obtain the OFDM PDSCH start symbol via PDSCH or ePDCCH.
  • User equipments which monitor PDCCH for downlink control data may receive the start symbol via a CFI in PCFICH or via PDCCH with SI-RNTI. Thereafter, both user equipments may obtain the same downlink broadcast transmission data via the PDSCH.
  • the OFDM PDSCH start symbol may be a fixed value.
  • the OFDM PDSCH start symbol may also be related to the maximum size of the legacy control region, which may be 0, 2, 3 or 4.
  • the OFDM PDSCH start symbol may be a pre-configured value based on a system bandwidth or any other system parameters. Thus, there may be a number of pre-configured OFDM PDSCH start symbol values where each value may be associated with a respective system parameter.
  • the wireless terminal may retrieve the OFDM PDSCH start symbol provided by the base station.
  • the system bandwidth may be used to determine the start value and the system bandwidth is signaled in the MIB. So when user equipment detects the MIB, it may derive the start symbol value used for broadcast transmissions in the cell.
  • FIG. 18 illustrates an example node configuration of a base station or eNB 401 which may perform some of the example embodiments described herein.
  • the base station 401 may comprise radio circuitry or a communication port 410 that may be configured to receive and/or transmit communication data, instructions, and/or messages.
  • the radio circuitry or communication port 410 may be comprised as any number of transceiving, receiving, and/or transmitting units or circuitry. It should further be appreciated that the radio circuitry or communication port 410 may be in the form of any input or output communications port known in the art.
  • the radio circuitry or communication port 410 may comprise RF circuitry and baseband processing circuitry (not shown).
  • the base station 401 may also comprise a processing unit or circuitry 420 which may be configured to provide scheduling for a downlink broadcast transmission based on an OFDM PDSCH start symbol and also be configured to provide such a symbol to a wireless terminal.
  • the processing circuitry 420 may be any suitable type of computation unit, for example, a microprocessor, digital signal processor (DSP), field programmable gate array (FPGA), or application specific integrated circuit (ASIC), or any other form of circuitry.
  • the base station 401 may further comprise a memory unit or circuitry 430 which may be any suitable type of computer readable memory and may be of volatile and/or non-volatile type.
  • the memory 430 may be configured to store received, transmitted, and/or measured data, device parameters, communication priorities, and/or executable program instructions.
  • FIG. 19 illustrates an example node configuration of a wireless terminal 505 which may perform some of the example embodiments described herein.
  • the wireless terminal 505 may be a user equipment, machine-to-machine type device, or any other device capable of communicating with a communications network.
  • the wireless terminal 505 may comprise radio circuitry or a communication port 510 that may be configured to receive and/or transmit communication data, instructions, and/or messages.
  • the radio circuitry or communication port 510 may be comprised as any number of transceiving, receiving, and/or transmitting units or circuitry.
  • the radio circuitry or communication port 510 may be in the form of any input or output communications port known in the art.
  • the radio circuitry or communication port 510 may comprise RF circuitry and baseband processing circuitry (not shown).
  • the wireless terminal 505 may also comprise a processing unit or circuitry 520 which may be configured to obtain downlink broadcast transmission on PDSCH using a received OFDM PDSCH symbol as described herein.
  • the processing circuitry 520 may be any suitable type of computation unit, for example, a microprocessor, digital signal processor (DSP), field programmable gate array (FPGA), or application specific integrated circuit (ASIC), or any other form of circuitry.
  • the wireless terminal 505 may further comprise a memory unit or circuitry 530 which may be any suitable type of computer readable memory and may be of volatile and/or non-volatile type.
  • the memory 530 may be configured to store received, transmitted, and/or measured data, device parameters, communication priorities, and/or executable program instructions.
  • FIG. 20 is a flow diagram depicting example operations which may be taken by the base station 401 as described herein for scheduling downlink broadcast transmissions using an OFDM PDSCH start symbol and for providing such a symbol. It should also be appreciated that FIG. 20 comprises some operations which are illustrated with a solid border and some operations which are illustrated with a dashed border. The operations which are comprised in a solid border are operations which are comprised in the broadest example embodiment. The operations which are comprised in a dashed border are example embodiments which may be comprised in, or a part of, or are further operations which may be taken in addition to the operations of the broader example embodiments. It should be appreciated that these operations need not be performed in order. Furthermore, it should be appreciated that not all of the operations need to be performed. The example operations may be performed in any order and in any combination.
  • the base station 401 is configured to provide 10, to at least one wireless terminal 505 A that monitors an ePDCCH for receiving downlink control information, an OFDM PDSCH start symbol.
  • the OFDM PDSCH start symbol assists in identifying a start of downlink broadcast transmissions provided on the PDSCH.
  • the processing circuitry 420 is configured to provide the OFDM PDSCH start symbol to the at least one wireless terminal 505 A that monitors the ePDCCH for receiving downlink control information.
  • the OFDM PDSCH start symbol may be provided via a message transmitted outside of a control region of a subframe, where the control region may comprise at least a PDCCH.
  • This control region is sometimes referred to as a legacy control region. It should be appreciated that the control region may comprise zero symbols. In such an instance, the OFDM PDSCH start symbol may comprise a value of zero. Examples of such a control region provided at least in FIGS. 12 , 14 and 16 .
  • the OFDM PDSCH start symbol may be based on a predefined value.
  • the OFDM PDSCH start symbol may be a fixed value.
  • the OFDM PDSCH start symbol may depend on any number of system parameters, for example, a system bandwidth. Therefore, different predefined values may be associated with respective system bandwidth values.
  • a fixed value may be provided by the base station and retrieved by the wireless terminal via, for example, a table or database.
  • the provided OFDM PDSCH start symbol is of a same value as the CFI via PCFICH.
  • the OFDM PDSCH start symbol may be provided by sending 11 a DCI message via the ePDCCH.
  • the radio circuitry 410 may be configured to send the DCI message via the ePDCCH. Examples of providing the OFDM PDSCH start symbol via DCI messaging is described further under at least the subheadings ‘Overview of Example Embodiments’ and ‘Symbol Handling via DCI Messaging’.
  • the base station 401 may configure 12 a PCFICH CFI value in a subframe, in which downlink broadcast transmissions are sent, to be equal to the OFDM PDSCH start symbol.
  • the processing circuitry 420 may configured the PCFICH CFI value in the subframe, in which the downlink broadcast transmissions are sent, to be equal to the OFDM PDSCH start symbol.
  • the PCFICH CFI is obtained by wireless terminals 505 B which monitor PDCCH for obtaining downlink control information.
  • both wireless terminals 505 A and 505 B may receive the same downlink broadcast transmissions via the same PDSCH.
  • the base station 401 may send 13 a RRC message comprising the OFDM PDSCH start symbol via PDSCH.
  • the OFDM PDSCH start symbol is an RRC configured value.
  • the radio circuitry 410 may be configured to send the RRC message via PDSCH. Examples of providing the OFDM PDSCH start symbol via the RRC message is described further under at least the subheadings ‘Overview of Example Embodiments’ and ‘Symbol Handling via RRC Messaging’.
  • the base station 401 may configure 14 a PCFICH CFI value in a subframe, in which downlink broadcast transmissions are sent, to be equal to the OFDM PDSCH start symbol.
  • the processing circuitry 420 may configure the PCFICH CFI value in the subframe, in which the downlink broadcast transmissions are sent, to be equal to the OFDM PDSCH start symbol.
  • the PCFICH CFI is obtained by wireless terminals 505 B which monitor PDCCH for obtaining downlink control information.
  • both wireless terminals 505 A and 505 B may receive the same downlink broadcast transmissions via the same PDSCH.
  • the base station 401 may also be configured to send 16, to at least one other wireless terminal 505 B which monitors the PDCCH for receiving downlink control information, same downlink broadcast transmissions scheduled in the PDSCH.
  • the radio circuitry 410 is configured to send, to the at least one other wireless terminal 505 B which monitors the PDCCH for receiving downlink control information, the same downlink broadcast transmissions scheduled in the PDSCH.
  • wireless terminals 505 A and 505 B may monitor different control channels, and therefore may receive different start values.
  • the receipt of different start values may result in different wireless terminals (e.g., wireless terminals 505 A and 505 B) receiving different downlink broadcast transmissions via different PDSCHs.
  • wireless terminals which monitor different control channels may now receive the same downlink broadcast transmissions via the same PDSCH via the transmission of the OFDM PDSCH start symbol.
  • FIG. 21 is a flow diagram depicting example operations which may be taken by the wireless terminal 505 A as described herein for receiving downlink broadcast transmissions via a PDSCH. It should also be appreciated that FIG. 21 comprises some operations which are illustrated with a solid border and some operations which are illustrated with a dashed border. The operations which are comprised in a solid border are operations which are comprised in the broadest example embodiment. The operations which are comprised in a dashed border are example embodiments which may be comprised in, or a part of, or are further operations which may be taken in addition to the operations of the broader example embodiments. It should be appreciated that these operations need not be performed in order. Furthermore, it should be appreciated that not all of the operations need to be performed. The example operations may be performed in any order and in any combination.
  • the wireless terminal 505 A is configured to monitor 28 an ePDCCH for downlink control information.
  • the processing circuitry 520 is configured to monitor the ePDCCH for the downlink control information.
  • An example of such downlink control information is a start symbol for reading downlink broadcast transmissions.
  • the wireless terminal 505 A is also configured to obtain 30 an OFDM PDSCH start symbol.
  • the OFDM PDSCH start symbol may be used for identifying a start in the downlink broadcast transmissions.
  • the processing circuitry 520 is configured to obtain the OFDM PDSCH start symbol.
  • the OFDM PDSCH start symbol may be obtained via a message transmitted outside of a control region of a subframe, where the control region may comprise at least a PDCCH.
  • This control region is sometimes referred to as a legacy control region. It should be appreciated that the control region may comprise zero symbols. In such an instance, the OFDM PDSCH start symbol may comprise a value of zero. Examples of such a control region provided at least in FIGS. 12 , 14 and 16 .
  • the OFDM PDSCH start symbol may be based on a predefined value.
  • the OFDM PDSCH start symbol may be a fixed value.
  • the OFDM PDSCH start symbol may depend on any number of system parameters, for example, a system bandwidth. Therefore, different predefined values may be associated with respective system bandwidth values.
  • Such a fixe value may be provided by the base station and retrieved by the wireless terminal via, for example, a table or database or via broadcast transmissions.
  • the provided OFDM PDSCH start symbol is of a same value as the CFI via PCFICH.
  • the message may be a DCI message and the obtaining 30 may further comprise receiving 31, from a network node, the DCI message via the ePDCCH.
  • the radio circuitry 510 may be configured to receive, from the network node, the DCI message via ePDCCH.
  • the network node may be the base station 401 or a rely node comprised in the network. Examples of receiving the OFDM PDSCH start symbol via DCI messaging is described further under at least the subheadings ‘Overview of Example Embodiments’ and ‘Symbol Handling via DCI Messaging’.
  • the message may be a RRC message and the obtaining 30 may further comprise receiving 32, from a network node, the RRC message via the PDSCH.
  • the radio circuitry 510 may be configured to receive, from the network node, the RRC message via PDSCH.
  • the network node may be the base station 401 or a relay node comprised in the network.
  • the OFDM PDSCH start symbol may be a RRC configured value. Examples of receiving the OFDM PDSCH start symbol via RRC messaging is described further under at least the subheadings ‘Overview of Example Embodiments’ and ‘Symbol Handling via RRC Messaging’.
  • the obtaining may further comprise retrieving 33 the OFDM PDSCH start symbol based on a static value or a pre-configured value based on a system bandwidth.
  • the processing circuitry 520 may be configured to retrieve the OFDM PDSCH start symbol based on the static value or the pre-configured value based on the system bandwidth.
  • the pre-configured value may be based on a single fixed value or any number of different predefined values. Different predefined values may be associated with respective system bandwidth values. Such a fixe value may be provided by the base station and retrieved by the wireless terminal via, for example, a table or database.
  • the wireless terminal 505 A is also configured to receive 34 downlink broadcast transmissions on the PDSCH based on the OFDM PDSCH start symbol.
  • the radio circuitry 510 is configured to receive the downlink broadcast transmissions on the PDSCH based on the OFDM PDSCH start symbol.
  • the receiving 34 may further comprise receiving 35 same downlink broadcast transmissions on the PDSCH as a wireless terminal 505 B which monitors the PDCCH for receiving downlink control information.
  • the radio circuitry 510 is configured to receive same downlink broadcast transmissions on the PDSCH as the wireless terminal 505 B which monitors the PDCCH for receiving downlink control information.
  • wireless terminals 505 A and 505 B may monitor different control channels, and therefore may receive different start values.
  • the receipt of different start values may result in different wireless terminals (e.g., wireless terminals 505 A and 505 B) receiving different downlink broadcast transmissions via different PDSCHs.
  • wireless terminals which monitor different control channels may now receive the same downlink broadcast transmissions via the same PDSCH.
  • a device or user equipment as the term is used herein, is to be broadly interpreted to comprise a radiotelephone having ability for Internet/intranet access, web browser, organizer, calendar, a camera (e.g., video and/or still image camera), a sound recorder (e.g., a microphone), and/or global positioning system (GPS) receiver; a personal communications system (PCS) user equipment that may combine a cellular radiotelephone with data processing; a personal digital assistant (PDA) that can comprise a radiotelephone or wireless communication system; a laptop; a camera (e.g., video and/or still image camera) having communication ability; and any other computation or communication device capable of transceiving, such as a personal computer, a home entertainment system, a television, etc.
  • PDA personal digital assistant
  • the term user equipment may also comprise any number of connected devices, wireless terminals or machine-to-machine devices.
  • a computer-readable medium may comprise removable and non-removable storage devices comprising, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc.
  • program modules may comprise routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types.
  • Computer-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.

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US20160338093A1 (en) 2016-11-17
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US11184913B2 (en) 2021-11-23

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