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WO2016130076A1 - Mécanismes de demande d'ordonnancement dans une agrégation de porteuses - Google Patents

Mécanismes de demande d'ordonnancement dans une agrégation de porteuses Download PDF

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Publication number
WO2016130076A1
WO2016130076A1 PCT/SE2016/050102 SE2016050102W WO2016130076A1 WO 2016130076 A1 WO2016130076 A1 WO 2016130076A1 SE 2016050102 W SE2016050102 W SE 2016050102W WO 2016130076 A1 WO2016130076 A1 WO 2016130076A1
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WIPO (PCT)
Prior art keywords
serving cell
uplink serving
uplink
wireless device
scheduling requests
Prior art date
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Application number
PCT/SE2016/050102
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English (en)
Inventor
Marco BELLESCHI
Mattias BERGSTRÖM
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Publication of WO2016130076A1 publication Critical patent/WO2016130076A1/fr
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Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • 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 signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • the present disclosure is generally related to wireless communications networks, and is more particularly related to scheduling uplink resources in a carrier aggregation scenario.
  • CA carrier aggregation
  • UEs user equipments
  • LTE Long-Term Evolution
  • a UE can be configured to transmit and/or receive data in two or three (or more) simultaneous bands in the downlink (DL) and/or in the uplink (UL).
  • Reference source not founcL Figure 1 illustrates an example base station (an evolved Node B, or eNB, in the 3GPP terminology for LTE systems) that is capable of operating four different cells at the same time. These cells are operated in different bands, or they could also be operated in the same band. In networks compliant with only earlier versions of the 3 GPP specifications, i.e., up to Release 8, only one cell is used for communication between the eNB and the wireless terminal (referred to as a user equipment, or UE, in 3 GPP documentation). Note that the term "cell” as used here is closely related to the term “carrier,” and refers to an independent set of radio channels operated in such a way that a UE can obtain service using only one cell.
  • compatible UEs may receive and transmit data on more than one carrier/cell at a time, depending on how those UEs are configured by the network.
  • the separate carriers in a carrier aggregation scenario are referred to as component carriers (CCs).
  • CCs component carriers
  • Example carrier aggregation configurations are described below.
  • 2DL CA (CA with two DL CCs and one UL CO
  • Figure 2 illustrates a scenario in which two of the cells are activated for one UE, which is the initial version of DL carrier aggregation.
  • the UE is configured to receive in two DL bands simultaneously, while using UL in only one of the bands.
  • the specific UL allocation in this case is arbitrary, meaning that either of the bands can be used for UL transmission.
  • the cell where the UL is allocated for a particular UE is the PCell (primary cell) for that UE, while the other aggregated cell is an SCell (secondary cell).
  • PCell and SCell combinations are UE-specific, in that the network can configure different UEs to have different allocations of PCell and SCells while using the same carriers.
  • 3DL CA (CA with three DL CCs and one or two UL CCs)
  • Figure 3 illustrates a scenario in which three DL carriers, falling in two different frequency bands, are allocated to a UE.
  • the UL can be allocated to any of the bands.
  • this configuration is referred to as inter-band carrier aggregation, similar to 2DL inter-band carrier aggregation.
  • Figure 4 illustrates a scenario in which UL carrier aggregation is also enabled for the UE.
  • UL carrier aggregation only two UL and two DL carrier aggregation is shown.
  • PCell and SCell definitions are still UE-specific.
  • 2UL carrier aggregation can be combined with the carrier aggregation of more than two DL carriers.
  • the specifications for carrier aggregation in LTE provide for the possibility to aggregate up to 5 CCs, potentially of different bandwidths (1.4 MHz, 3 MHz, 5MHz, 10 MHz, 15 MHz, 20 MHz), thus pushing the maximum aggregated bandwidth to 100 MHz.
  • a key feature of carrier aggregation is that the aggregation can take place across CCs that are not necessarily contiguous in frequency. This means that operators possessing a fragmented spectrum can still boost the achievable data rate, even when they are not provided with a large enough single wideband carrier.
  • CA is typically activated and deactivated by the network on a UE basis in a dynamic fashion based on factors such as the DL/UL traffic demands, the channel qualities, or some load balancing policies that force the UE to move to some specific carriers.
  • a CA-capable UE can be provided with a primary carrier (PCell) and one or more secondary carriers (SCell) where each carrier looks like a cell with its own identity number.
  • PCell primary carrier
  • SCell secondary carriers
  • some operations in carrier aggregation are supposed to be handled only by or on the PCell, e.g., the transmission of Physical Uplink Control Channel (PUCCH) Uplink Control Information (UCI), the Contention-Based Random Access (CBRA), the Radio Resource Control (RRC) signaling, or the sending of Network Access
  • PUCCH Physical Uplink Control Channel
  • UCI Uplink Control Information
  • CBRA Contention-Based Random Access
  • RRC Radio Resource Control
  • NAS Stratum
  • the selection of PCell and SCell(s) is also UE-specific; selecting the PCell and the SCell(s) for a given UE can also be based on factors such as the DL UL traffic demands, channel qualities, etc.
  • Assisted Access in the future LTE framework. This might include the possibility of aggregating licensed carriers with unlicensed CCs (e.g. Wi-Fi bands), to more fully exploit the available operator's spectrum.
  • CCs e.g. Wi-Fi bands
  • SR Scheduling Request
  • PUSCH Physical Uplink Shared Channel
  • the eNB Upon detection of an SR from a UE, the eNB sends the UE a UL scheduling grant (whose size may be minimum number of bits or otherwise implementation-dependent) via the Physical Downlink Control Channel (PDCCH).
  • the UE in turn might initiate UL transmissions, using the granted resources, and send a buffer status report, which can trigger further UL scheduling grants from the eNB.
  • an SR is retriggered with a certain periodicity.
  • SRs along with HARQ feedbacks and CQI/PMLRI feedbacks are sent in the PUCCH and only in the PCell.
  • SRs do not occupy a significant amount of resources (just 1 -bit per transmission) and existing PUCCH formats can be reused.
  • an SR is a critical piece of information that needs to be timely detected by the eNB, since it directly impacts the quality of UL transmissions especially in case of delay-sensitive services, such as voice services.
  • 3 GPP specifications permit the configuration of different values for the cyclic shift that determines the maximum number of SR attempts from different UEs that can be multiplexed in the same PUCCH physical resource block (PRB) pair.
  • PRB physical resource block
  • a method in a wireless device supporting uplink carrier aggregation includes transmitting one or more scheduling requests on a first uplink serving cell.
  • the method also includes, in response to not receiving an uplink grant after a predetermined number of scheduling requests on the first uplink serving cell and/or after a predetermined time interval, transmitting one or more scheduling requests on a second uplink serving cell.
  • a method in a wireless device supporting uplink carrier aggregation includes transmitting one or more scheduling requests on a first uplink serving cell.
  • the method also includes determining that the first uplink serving cell or a group of uplink serving cells that includes the first uplink serving cell has become less reliable.
  • the method further includes transmitting one or more scheduling requests on the second uplink serving cell.
  • the first uplink serving cell or a group of uplink serving cells that includes the first uplink serving cell may have become less reliable than a second uplink serving cell for transmitting scheduling requests.
  • a method in a base station operating in a wireless network and supporting uplink carrier aggregation includes detecting one or more scheduling requests sent by a wireless device on a second uplink serving cell.
  • the second uplink serving cell is different than a first uplink serving cell on which the base station expects the one or more scheduling requests according to a scheduling request configuration for the wireless device.
  • the method further includes taking action to change a scheduling request priority or the scheduling request configuration for the wireless device to the second uplink serving cell from the first uplink serving cell.
  • a method in a base station that supports uplink carrier aggregation for wireless devices includes detecting an event corresponding to a wireless device configured for uplink carrier aggregation. In response to said detecting, the method also includes evaluating a scheduling request utilization for an uplink serving cell for which the wireless device is configured to send scheduling requests. The method further includes determining whether to release scheduling request resources for the wireless device on the uplink serving cell, based on the scheduling request utilization.
  • a method in a wireless device operating in a wireless network that supports uplink carrier aggregation, includes alternating transmission of one or more scheduling requests between a first uplink serving cell and a second uplink service cell according to a periodic pattern.
  • a wireless device includes a radio transceiver circuit configured for communication with a wireless network using uplink carrier aggregation and a processing circuit.
  • the processing circuit is configured to transmit, via the radio transceiver circuit, one or more scheduling requests on a first uplink serving cell.
  • the processing circuit is also configured to, in response to not receiving an uplink grant after a predetermined number of scheduling requests on the first uplink serving cell and/or after a predetermined time interval, transmit one or more scheduling requests on a second uplink serving cell.
  • a wireless device includes a radio transceiver circuit configured for communication with a wireless network using uplink carrier aggregation and a processing circuit.
  • the processing circuit is configured to transmit, via the radio transceiver circuit, one or more scheduling requests on a first uplink serving cell.
  • the processing circuit is also configured to determine that the first uplink serving cell or a group of uplink serving cells that includes the first uplink serving cell has become less reliable.
  • the processing circuit is also configured to, in response to said determining, transmit one or more scheduling requests on the second uplink serving cell.
  • a wireless device includes a radio transceiver circuit configured for communication with a wireless network using uplink carrier aggregation and a processing circuit.
  • the processing circuit is configured to alternate transmission of one or more scheduling requests between a first uplink serving cell and a second uplink service cell according to a periodic pattern.
  • a base station includes a radio transceiver circuit configured for communication with a wireless device using uplink carrier aggregation and a processing circuit.
  • the processing circuit is configured to detect one or more scheduling requests sent by a wireless device on a second uplink serving cell, where the second uplink serving cell is different than a first uplink serving cell on which the base station expects the one or more scheduling requests according to a scheduling request configuration for the wireless device.
  • the processing circuit is configured to, in response to detecting the one or more scheduling requests sent by the wireless device on the second uplink serving cell, take action to change a scheduling request priority or the scheduling request configuration for the wireless device to the second uplink serving cell from the first uplink serving cell.
  • a base station includes a radio transceiver circuit configured for communication with a wireless device using uplink carrier aggregation and a processing circuit.
  • the processing circuit is configured to detect an event corresponding to the wireless device and, in response to said detecting, evaluate a scheduling request utilization for an uplink serving cell for which the wireless device is configured to send scheduling requests.
  • the processing circuit is also configured to determine whether to release scheduling request resources for the wireless device on the uplink serving cell, based on the scheduling request utilization.
  • Figure 1 illustrates single-uplink and single-downlink transmission between a base station (eNB) and a wireless device (UE).
  • eNB base station
  • UE wireless device
  • Figure 2 illustrates downlink carrier aggregation, with single-uplink transmission.
  • Figure 3 illustrates downlink carrier aggregation across three downlink bands.
  • Figure 4 illustrates carrier aggregation in both uplink and downlink.
  • Figure 5 illustrates the transmission of PUCCH on SCells in a carrier aggregation scenario.
  • Figure 6 illustrates a scenario in which SR transmissions by a given UE are activated in both the PCell and an SCell.
  • Figure 7 is a block diagram illustrating components of an example wireless device, according to some embodiments.
  • Figure 8 is a process flow diagram illustrating a method carried out in the wireless device, according to some embodiments.
  • Figure 9 is a process flow diagram illustrating another method carried out in the wireless device, according to some embodiments.
  • Figure 10 is a block diagram illustrating components of an example base station, according to some embodiments.
  • Figure 11 is a process flow diagram illustrating a method carried out in the base station, according to some embodiments.
  • Figure 12 is a process flow diagram illustrating another method carried out in the base station, according to some embodiments.
  • Figure 13 is a process flow diagram illustrating a wireless device configured to send scheduling requests on two cells, according to some embodiments.
  • Figure 14 is a process flow diagram illustrating an admission control algorithm for scheduling request resources, according to some embodiments.
  • Figure 15 is a process flow diagram illustrating a method carried out in the wireless device, according to some embodiments.
  • Figure 16 is an example functional implementation of a wireless device, according to some embodiments.
  • Figure 17 is another example functional implementation of a wireless device, according to some embodiments.
  • Figure 18 is an example functional implementation of a base station, according to some embodiments.
  • Figure 19 is another example functional implementation of a base station, according to some embodiments.
  • PUCCH transmissions on SCells poses new challenges, including determining how to arrange and select the available carriers for PUCCH transmissions. It also offers new opportunities for allocating the available spectrum to the different UCIs (HARQ feedbacks, CQI/PMI/RI, SR) in order to balance the UCI load across all the CCs. There is no defined configuration for SR resource use when there are PUCCH transmissions on multiple cells. The embodiments described herein address these issues.
  • FIG. 6 One possible scenario for application of the embodiments is illustrated in Figure 6, where the eNB handles a macro PCell and a non-collocated radio remote head (RRH) operating in another carrier as a SCell.
  • RRH radio remote head
  • the UE is located under the coverage of the RRH and that this RRH provides a better quality signal than the PCell, it might be convenient for the UE to send an SR in the SCell, since it provides better channel conditions and thus increase the probability of successfully detecting the SR.
  • the RRH might become suddenly unreliable for any of many different reasons, e.g., UE mobility, equipment breakdowns, overloading, etc. Under such circumstances, it would be preferable that the UE could start sending SRs to the PCell, rather than the SCell, without initiating a random access procedure in the PCell.
  • the eNB Upon receipt of an SR, the eNB typically provides the UE with a grant for UL
  • the eNB can implicitly recognize that the SCell has become unreliable as soon as the SR attempt is detected in the PCell. The eNB can take appropriate action upon this recognition.
  • FIG. 7 illustrates features of an example wireless device 400.
  • the non-limiting term UE is used.
  • the terms “communication device,” “wireless device,” “mobile terminal,” or “mobile station” may be used.
  • a UE or communication device described herein can be any type of wireless device capable of communicating with a network node or with another communication device over radio signals.
  • Such a device may also be referred to as a radio communication device or a target device, and such devices may also include any of those devices known as a device-to-device (D2D) UE, a machine-type UE or UE capable of machine-to-machine communication (M2M), a sensor equipped with a UE, a wireless-enabled tablet computing device, a mobile terminal, a smart phone, a laptop embedded equipped (LEE), a laptop-mounted equipment (LME), a USB dongle, a Customer Premises Equipment (CPE), etc.
  • D2D device-to-device
  • M2M machine-type UE or UE capable of machine-to-machine communication
  • M2M machine-to-machine communication
  • sensor equipped with a UE a wireless-enabled tablet computing device
  • mobile terminal a smart phone
  • LEE laptop embedded equipped
  • LME laptop-mounted equipment
  • USB dongle a Customer Premises Equipment
  • LTE Long-Term Evolution
  • RAN radio access network
  • RAT radio access technology
  • 3 GPP 3 GPP
  • Wireless device 400 such as a UE configured for operation with an LTE network (E- UTRAN), includes a transceiver unit 420 for communicating with one or more base stations (eNBs) as well as a processing circuit 410 for processing the signals transmitted and received by the transceiver unit 420.
  • Transceiver unit 420 includes a transmitter 425 coupled to one or more transmit antennas 428 and receiver 430 coupled to one or more receiver antennas 433. The same antenna(s) 428 and 433 may be used for both transmission and reception.
  • Receiver 430 and transmitter 425 use known radio processing and signal processing components and techniques, typically according to a particular telecommunications standard such as the 3 GPP standards for LTE.
  • transmitter unit 420 may comprise separate radio and/or baseband circuitry for each of two or more different types of radio access network, such as radio/baseband circuitry adapted for E-UTRAN access and separate radio/baseband circuitry adapted for Wi-Fi access.
  • radio/baseband circuitry adapted for E-UTRAN access and separate radio/baseband circuitry adapted for Wi-Fi access.
  • Processing circuit 410 comprises one or more processors 440 coupled to one or more memory devices 450 that make up a data storage memory 455 and a program storage memory 460.
  • Processor 440 identified as CPU 440 in Figure 7, may be a microprocessor,
  • processing circuit 410 may comprise a processor/firmware combination, or specialized digital hardware, or a combination thereof.
  • Memory 450 may comprise one or several types of memory such as readonly memory (ROM), random-access memory, cache memory, flash memory devices, optical storage devices, etc. If wireless device 400 supports multiple radio access technologies, processing circuit 410 may include separate processing resources dedicated to one or several radio access technologies, in some embodiments.
  • processing circuit 410 Typical functions of the processing circuit 410 include modulation and coding of transmitted signals and the demodulation and decoding of received signals.
  • processing circuit 410 is configured, using suitable program code stored in program storage memory 460, for example, to carry out relevant embodiments described herein.
  • the processing circuit 410 may be configured to transmit one or more scheduling requests on a first uplink serving cell and, in response to not receiving an uplink grant after a predetermined number of scheduling requests on the first uplink serving cell and/or after a predetermined time interval, transmit one or more scheduling requests on a second uplink serving cell.
  • the processing circuit 410 is configured to transmit, via the transceiver circuit 420, one or more scheduling requests on a first uplink serving cell.
  • the processing circuit 410 is also configured to determine that the first uplink serving cell or a group of uplink serving cells that includes the first uplink serving cell has become less reliable than a second uplink serving cell, for transmitting scheduling requests.
  • the processing circuit 410 is also configured to, in response to said determining, transmit one or more scheduling requests on the second uplink serving cell.
  • the processing circuit 410 is configured to alternate transmission of one or more scheduling requests between a first uplink serving cell and a second uplink service cell according to a periodic pattern.
  • the first and second serving cells may be defined within a subset of activated serving cells.
  • Figure 8 illustrates a method 800 in the wireless device 400.
  • the method 800 includes transmitting one or more scheduling requests on a first uplink serving cell (Block 802) and, in response to not receiving an uplink grant after a predetermined number of scheduling requests on the first uplink serving cell and/or after a predetermined time interval, transmitting one or more scheduling requests on a second uplink serving cell (Block 804).
  • transmitting one or more scheduling requests on the first uplink serving cells includes transmitting a predetermined number of scheduling requests or
  • scheduling requests for a predetermined period of time, such as the predetermined time interval.
  • the scheduling requests are transmitted on only one serving cell at a time or during a given interval.
  • the method 800 may also include determining which uplink serving cells on which to transmit scheduling requests according to a predetermined priority order, wherein the first uplink serving cell has a higher priority than the second uplink serving cell. This may include receiving configuration information from the wireless network, the configuration information establishing the predetermined priority order.
  • the first uplink serving cell is one of a plurality of uplink serving cells in a first group and the second uplink serving cell is one of a plurality of uplink serving cells in a second group, differing from the first group.
  • the transmitting then includes
  • scheduling requests are subsequently transmitted on each of two or more uplink serving cells in the second group, for a second predetermined time or for a second predetermined number of transmissions.
  • this includes determining which groups of uplink serving cells on which to transmit scheduling requests according to a predetermined priority order for the groups, wherein the first group of uplink serving cells has a higher priority than the second group of uplink serving cells. In other cases, this includes determining which groups of uplink serving cells on which to transmit scheduling requests according to a timer or counter.
  • Figure 9 illustrates another method 900 in the wireless device 400.
  • the method 900 includes transmitting one or more scheduling requests on a first uplink serving cell (Block 902).
  • the method 900 also includes determining that the first uplink serving cell or a group of uplink serving cells that includes the first uplink serving cell has become less reliable than a second uplink serving cell for transmitting scheduling requests (Block 904).
  • the method 900 further includes transmitting one or more scheduling requests on the second uplink serving cell (Block 906).
  • determining that the first uplink serving cell or the group of uplink serving cells has become less reliable includes determining that the first uplink serving cell or a group of uplink serving cells that includes the first uplink serving cell is being deactivated.
  • the second uplink serving cell may be selected based on a predetermined priority associated with the second uplink serving cell.
  • RSRP Received Signal Reference Power
  • RSRQ Received Signal Reference Quality
  • determining that the first uplink serving cell or the group of uplink serving cells has become less reliable includes determining that a timing advance timer (TAT) for the first uplink serving cell or for one or more uplink serving cells of the group of uplink serving cells has expired.
  • the unreliability determination may also include determining that the wireless device 400 is power limited for the first uplink serving cells or for the group of uplink serving cells. It may also be that no uplink grant has been provided to the wireless device 400 in response to the series of scheduling requests on the first uplink serving cell.
  • FIG. 10 illustrates an example configuration of a base station 401 A that, in some embodiments, may perform some or all of the base-station related methods described herein.
  • Base station 401 A which may be an eNB for use in an LTE Radio Access Network (RAN), for example, includes a communication interface circuit configured to communicate with a core network (CN) node and configured to communicate with one or more wireless devices.
  • the communication interface circuit includes two parts - radio transceiver circuitry 41 OA and a network interface circuit 440A.
  • the radio transceiver circuitry 41 OA is configured to receive and/or transmit communication measurements, data, instructions, and/or messages to and from one or more wireless devices.
  • the network interface circuit 440 A is configured to receive and send network communications to and from other network nodes, including one or more CN nodes. It should be appreciated that the radio circuitry 41 OA may include any number of transceiving, receiving, and/or transmitting units or circuitry.
  • the radio circuitry 41 OA and/or network interface 440A may comprise radio-frequency (RF) circuitry and baseband processing circuitry, the details of which are well known to those familiar with base station design.
  • RF radio-frequency
  • the base station 401 A also includes processing circuitry 420 A, which is configured to, for example, detect one or more scheduling requests sent by a wireless device 400 on a second uplink serving cell, where the second uplink serving cell is different than a first uplink serving cell on which the base station expects the scheduling requests according to a scheduling request configuration for the wireless device.
  • the processing circuitry 420A is also configured to, in response to detecting the one or more scheduling requests sent by the wireless device on the second uplink serving cell, take action to change a scheduling request priority or configuration for the wireless device to the second uplink serving cell from the first uplink serving cell.
  • the processing circuitry 420A is configured to detect an event corresponding to the wireless device 400 and, in response to said detecting, evaluate a scheduling request utilization for an uplink serving cell for which the wireless device is configured to send scheduling requests.
  • the processing circuitry 420A is also configured to determine whether to release scheduling request resources for the wireless device 400 on the uplink serving cell, based on the scheduling request utilization.
  • the processing circuitry 420A may be any suitable type of computation unit, e.g. 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 A may further comprise a memory unit or circuitry 43 OA which may be any suitable type of computer readable memory and may be of volatile and/or non-volatile type.
  • the memory 43 OA may be configured to store program data, for use by processing circuitry 420 A, as well as configuration data, operational data, etc.
  • Figure 11 illustrates a method 1100 in the base station 401 A that supports uplink carrier aggregation for wireless devices.
  • the method 100 includes detecting one or more scheduling requests sent by a wireless device 400 on a second uplink serving cell, wherein the second uplink serving cell is different than a first uplink serving cell on which the base station expects the one or more scheduling requests according to a scheduling request configuration for the wireless device (Block 1102).
  • the method 100 also includes, in response to detecting the scheduling requests sent by the wireless device 400 on the second uplink serving cell, taking action to change a scheduling request priority or configuration for the wireless device 400 to the second uplink serving cell from the first uplink serving cell (Block 1104).
  • the action taken includes deconfiguring scheduling request resources for the wireless device 400 in the first uplink serving cell or for each uplink serving cell in a group of uplink serving cells that includes the first uplink serving cell.
  • the action may also include changing the priority of the first and/or second uplink serving cells with respect to scheduling request transmissions, for first wireless device 400 and/or for one or more additional wireless devices.
  • Changing the priority of the first and/or second uplink serving cells with respect to scheduling request transmissions may include sending configuration information to affected wireless devices, the configuration information defining a priority for the first and/or second uplink serving cell with respect to scheduling request transmissions.
  • the action may include configuring the wireless device 400 to allow the use of a new uplink serving cell or new group of uplink serving cells for scheduling request transmissions.
  • the method 1100 may also include selecting the new uplink serving cell or new group of uplink serving cells based on one or more of two other actions.
  • One of these actions includes scheduling request utilization on the first uplink serving cell, and/or the second uplink serving cell, and/or the new uplink serving cell or new group of uplink serving cells.
  • the other action includes loading on one or more of the first uplink serving cell, the second uplink serving cell, and the new uplink serving cell or new group of uplink serving cells.
  • Figure 12 illustrates another method 1200 in the base station 401 A that supports uplink carrier aggregation for wireless devices.
  • the method 1200 includes detecting an event corresponding to a wireless device 400 configured for uplink carrier aggregation (Block 1202).
  • the method 1200 also includes evaluating a scheduling request utilization for an uplink serving cell for which the wireless device is configured to send scheduling requests (Block 1204).
  • the method 1200 further includes determining whether to release scheduling request resources for the wireless device 400 on the uplink serving cell, based on the scheduling request utilization (Block 1206).
  • determining whether to release scheduling request resources for the wireless device 400 on the uplink serving cell includes releasing scheduling request resources for the wireless device 400 on the uplink serving cell and configuring and/or activating scheduling request resources for the wireless device 400 in a new serving cell, in response to determining that the scheduling request utilization is above a predetermined threshold.
  • Determining whether to release scheduling request resources for the wireless device 400 on the uplink serving cell may also include keeping scheduling request resources for the wireless device 400 on the uplink serving cell, in response to determining that the scheduling request utilization is not above a first predetermined threshold.
  • the method 1200 also includes configuring and/or activating scheduling request resources for the wireless device 400 in a new serving cell, in response to determining a type of bearer to be established and/or determining that a bearer- related priority for the wireless device 400 is above a second predetermined threshold.
  • SR transmissions are activated in more than one serving cell.
  • the description below also provides the conditions (e.g. channel quality, path loss, cell load, counter limit, time alignment expiry, etc.) under which such SR transmissions can take place either in a single one of the activated SR resources or in parallel in multiple serving cells, or in parallel in a subset of the activated SR resources, or alternated according to a specific periodicity in multiple serving cells or a subset of serving cells.
  • the disclosed techniques and apparatus allow for better exploitation of the UL CA spectrum to aid SR detection.
  • SR detection is a critical step in achieving good UL quality in the case of delay-sensitive services (e.g. voice).
  • the eNB implementation should guarantee good SR capacity, i.e., the eNB shall deal with multiple SR transmissions sent from different UEs in the same PUCCH PRB.
  • the enhancement of these two aspects i.e., SR detection rate and SR capacity
  • the disclosed techniques also limit the latency due to the existing random access schemes that are used when serving cells become inactive or poor.
  • SR transmission by a UE is configured and activated in more than one serving cell.
  • communicating in more than one serving cell at the same time might not be needed, given that a single scheduler entity is generally handling the multiple CCs.
  • the eNB when configuring SR resources via RRC signalling, might signal a priority for one or more cells, to indicate which serving cell or cells the UE should prioritize for SR transmission.
  • the UE can deduce a priority for one or more cells based on a preconfigured rule. For instance, the UE can first try to send SRs to SCells and then to the PCell.
  • a parameter dsr-TransMax indicates the number of SR attempts a UE should try before initiating a random access procedure, in the event that no grant for uplink transmission is received from the eNB.
  • the eNB may configure multiple dsr-TransMax parameters for a given UE, where each of the dsr-TransMax parameters is associated with a serving cell.
  • the UE when it needs to send an SR, would consider the dsrTransMax and the priority or priorities associated with the serving cells before selecting the actual serving cell for SR transmission.
  • the UE is configured with a dsrTransMax parameter for each of serving cells A, B and C, the dsrTransMax parameters being referred to here as dsrTransMaxA, dsrTransMaxB and dsrTransMaxC , respectively.
  • the UE may also be configured to prioritize SRs on cell A, cell B and cell C in this order. The UE would then, as long as it has not been provided with a grant for uplink transmission, send SRs to the network such that the UE would first send dsrTransMaxA number of SRs on cell A, then send dsrTransMaxB number of SRs on cell B and then send dsrTransMaxC number of SRs on cell C.
  • the UE would initiate a random access procedure, e.g., by initiating the random access procedure on the PCell.
  • a random access procedure e.g., by initiating the random access procedure on the PCell.
  • An example of this is depicted in the process flow diagram of Figure 13, which illustrates the case when the UE is configured to send SR on two cells, i.e., ServingCellA and ServingCellB.
  • an SR counter is incremented for each SR that is sent to ServingCellA.
  • the counter exceeds the dsrTransMaxA number, the counter is reset and SRs are sent to ServingCellB. Again, each SR increments the counter.
  • the counter exceeds the dsrTransMaxA number
  • the eNB can take action upon detecting an SR in a serving cell with lower priority than the serving cell in which SRs have been previously sent. According to other embodiments, the eNB detects that an SR for a given UE is received in a different cell, with respect to a cell in which one or more previous SRs were received, and then selectively takes action in response to this detecting.
  • one or more SRs are first received on ServingCellA, but then an SR is received from the same UE on ServingCellB.
  • the eNB may take one or more actions in response.
  • One action involves the eNB deactivating and/or deconfiguring ServingCellA, at least with respect to the transmission of SR resources thereon.
  • the eNB may take one or more actions in response.
  • One action involves the eNB deactivating and/or deconfiguring ServingCellA, at least with respect to the transmission of SR resources thereon.
  • the eNB may take one or more actions in response.
  • One action involves the eNB deactivating and/or deconfiguring ServingCellA, at least with respect to the transmission of SR resources thereon.
  • a current ServingCellB priority is promoted over a ServingCellA priority with respect to the transmission SRs. This includes configuring ServingCellA to have a lower priority serving cell for the transmission of SRs than for
  • One action may also include the eNB configuring/activating another serving cell, and configuring new SR resources for the UE in that serving cell.
  • a serving cell can be assigned with a certain priority on the basis of signal quality measurements and/or the loading circumstances.
  • one or more different approaches are used to switch between the different serving cells activated for SR transmission. Examples of these approaches are described below, and it should be appreciated that two or more of these approaches may be combined in some embodiments.
  • a UE sends an SR to a lower priority serving cell (ServingCellB), after
  • T milliseconds from the first SR transmission attempt in a higher priority serving cell (ServingCellA).
  • the UE will, when wanting to request a scheduling grant from the network, first send SR(s) using a first serving cell for a predetermined time interval T. After the time T has passed, the UE sends the SR using a second serving cell. Note that this may have the practical effect that the UE sends the first SR(s) to a first node, and then begins sending SRs to a second node, after the time T.
  • the UE will start to send SR(s) to a first serving cell. After a time Ti, the UE will send SR(s) to a second serving cell instead, and after a time T 2 the UE will send SR(s) towards a third serving cell, and so on.
  • the UE may after a certain time T x perform a Random Access procedure in order to receive a scheduling grant, instead of sending SRs.
  • a UE sends an SR to a lower priority serving cell (ServingCellB) when the time alignment timer (TAT) in the time alignment group (TAG) of a higher priority serving cell (ServingCellA) expires.
  • TAT time alignment timer
  • TAG time alignment group
  • SCSellA higher priority serving cell
  • the UE may send an SR to a lower priority serving cell
  • servingCellB when a serving cell with lower priority (ServingCellA) is deactivated.
  • the UE will, when evaluating to which serving cell it should send SR(s), consider the activation/deactivation-status for the serving cells.
  • the UE is not expected to send any uplink transmissions on the cell and hence this approach will ensure that the UE is also not sending SRs to a serving cell which is deactivated.
  • the UE may send an SR to a lower priority serving cell (ServingCellB) if signal quality measurements such as Received Signal Reference Power (RSRP) and/or Received Signal Reference Quality (RSRQ) measurements on ServingCellB show good coverage, e.g., indicating that ServingCellB has the lowest path loss or a higher quality, given a certain hysteresis.
  • RSRP Received Signal Reference Power
  • RSRQ Received Signal Reference Quality
  • the UE will, when evaluating which serving cell to send SR(s) to, consider the channel conditions on the cells.
  • the UE may be configured to send SR(s) to the serving cell which the UE determine has highest signal quality and/or signal strength.
  • a hysteresis factor may be used in this determination, so that the UE does not unnecessarily switch between serving cells that have very similar conditions.
  • the techniques described above are generally based on an assumption that SR resources are configured for a given UE in more than one serving cell, while the UE is allowed to send SRs only in one of the activated serving cells, e.g., the ServingCellA having the highest priority.
  • FIG 14 illustrates an example admission control algorithm for SR resources.
  • a Radio Resource Management (RRM) event may be received or detected.
  • This event may be an A3 event, in which the UE reports an indication that a neighbor cell has a better signal quality than the PCell, by at least an offset.
  • the event may also be an A6 event, in which the UE reports an indication that a neighbor cell has a better signal quality than a SCell, by at least an offset.
  • the eNB checks whether the SR resource utilization in the current serving cell is above a configurable threshold SROverloadThr (or, equivalently, whether the available SR resources are less than a configurable threshold.) If this is the case, SR resources for the UE on the current serving cell are released.
  • new SR resources in another serving cell are activated for the UE, via RRC signalling. The activation of new SR resources in another serving cell may depend on its load and/or RSRP/RSRQ measurements, as discussed above.
  • the allocation and retention priority (ARP) priority of the UE is checked against a dedicated ARP priority threshold (shown as SRArpPrioThr in Figure 14) that the operator can configure.
  • ARP allocation and retention priority
  • the core network establishes an ARP value of the bearer to be setup.
  • the highest priority ARP can be taken as the ARP of the UE.
  • the eNB may decide to keep the SR resources for the UE in the serving cell and also configure new SR resources for the UE in another serving cell.
  • the activation of the new SR resources in another serving cell may also depend on its load and/or RSRP/RSRQ measurements, as discussed above.
  • SROverloadThr (or equivalent threshold) can be tuned dynamically according to some statistical results from the network, e.g., on the basis of reestablishment attempts from a UE, or by the operator on the basis of empirical analysis.
  • the SRArpPrioThr can be set statically by the operator or dynamically adjusted on the basis of the ARP priorities of those UEs currently having configured more than one serving cell for SR transmissions.
  • the quality-of-service (QoS) class identifier (QCI) and/or the bearers type (e.g. non-GBR, GBR) can be taken into account in the algorithm.
  • the UE sends an SR on only one serving cell at a given time (or during a given interval).
  • the UE is allowed to send SRs simultaneously to multiple serving cells. This would permit the UE to experience some diversity gain.
  • the use of simultaneous SR transmissions on multiple serving cells may be triggered by certain events, in some embodiments. For instance, a UE may be adapted to begin simultaneous SR transmissions when it becomes UL power limited on a serving cell, e.g., when it reaches its maximum allowed transmission power, and/or when no UL grant has been received after a certain number of SR attempts. This approach would increase the probability of having eventually a successful SR detection.
  • a UE must be specifically configured by the network, e.g., by RRC signalling, before it is allowed to transmit multiple simultaneous SRs.
  • the network's (e.g., eNB's) decision to configure this behaviour for a certain UE may depend on the UE's capability to support the feature, in some embodiments, and/or on the loading and signal quality for the involved serving cells.
  • a given UE may be allowed to simultaneously send SRs to only a subset of the activated serving cells, e.g., only to the serving cells belonging to the same TAG (TAG A).
  • TAG A the serving cells belonging to the same TAG
  • the UE shall start sending SRs jointly to another subset of serving cells belonging to another TAG (TAG B).
  • TAG B the eNB may deconfigure SR resources in the TAG A and potentially all the serving cells activated in TAG A.
  • a given UE may be allowed to send SRs on different serving cells at preconfigured intervals, not necessarily simultaneously.
  • the UE can be configured to alternate SR transmissions on different serving cells following a periodic pattern to randomize the interference experienced.
  • Such alternate SR transmissions can be defined within a subset of the activated serving cells.
  • previous approaches can be still applicable, e.g., after a certain number of SR attempts within the subset, a new subset of serving cells can be configured for SR transmission.
  • various embodiments may include different configurations.
  • SR resources are configured in multiple serving cells for a given UE, only one of the configured serving cells may be used for SR transmission at a time, according to a configured priority order.
  • SR resources may be configured in multiple serving cells for a given UE, and all of them can be used for SR transmission simultaneously.
  • SR resources may be configured in multiple serving cells for a given UE, but only a subset of them can be used for SR transmission simultaneously, according to a configured priority order.
  • SR resources are configured in multiple serving cells for a given UE, SR transmissions occur in those configured serving cells where each of the configured serving cells is assigned a certain periodicity for SR transmission.
  • SR transmission for a given UE may be switched from one of the activated serving cells configured with SR resources to another activated serving cell configured with SR resources, or from a subset of the activated serving cells configured with SR resources to another subset of activated serving cells configured with SR resources, according to a preconfigured SR counter, a preconfigured SR timer expiry, when the serving cell or the TAG in which SRs are currently transmitted is deactivated, or when the TAT of the serving cell or the TAT of the TAG in which SRs are currently transmitted is deactivated.
  • the UE may also be switched when RSRP/RSRQ measurements with hysteresis become better than the RSRP/RSRQ of the serving cell in which SRs are currently transmitted.
  • an eNB upon detection of an SR on an activated serving cell (or
  • TAG other than the serving cell (or TAG) in which SRs have been sent until now, deconfigures SR resources in the previous serving cell (or TAG), changes the SR priority order of the activated serving cells (or activated TAG(s)), configures a new serving cell (or TAG) for SR transmission, or configures a new serving cell (or TAG) for SR transmission.
  • the eNB may configure the serving cells (or TAGs) for SR transmission on the basis of SR resource utilization.
  • the UE may be configured with multiple SR resources on different serving cells on the basis of the ARP or on the type (e.g. non-GBR, GBR) of the radio bearers currently set up.
  • the UE may also be allowed to send SR attempts on multiple serving cells simultaneously in case the UE becomes power limited and/or no UL grant has been received successfully after a certain number of SR attempts.
  • Figure 15 illustrates another method performed by the wireless device, according to some embodiment.
  • the method 1500 includes alternating transmission (1502) of one or more scheduling requests between a first uplink serving cell and a second uplink service cell according to a periodic pattern.
  • the first and second serving cells may be defined within a subset of activated serving cells.
  • the method 1500 may also include alternating transmission of one or more scheduling requests between a third uplink serving cell and a fourth uplink service cell of another subset of activated serving cells, in response to a predetermined number of scheduling request attempts on the first and second serving cells.
  • Embodiments of the presently disclosed techniques include the various methods described above, including the methods illustrated in the process flow diagrams of Figures 8-9 and 11-15, as well as variants thereof.
  • Other embodiments include a base station apparatus configured to carry out one or more of the base-station-related methods and a wireless device apparatus configured to carry out one or more of the wireless-device-related methods.
  • processing circuits such as the processing circuits shown in Figures 7 and 10, are configured to carry out one or more of the techniques described in detail above.
  • other embodiments may include base stations and wireless devices that include one or more of such processing circuits.
  • these processing circuits are configured with appropriate program code, stored in one or more suitable memory devices, to implement one or more of the techniques described herein.
  • it will be appreciated that not all of the steps of these techniques are necessarily performed in a single microprocessor or even in a single module.
  • the processing circuit 410 can implement any one or more of the wireless- device-related methods described above using an arrangement of functional "modules," where the modules are computer programs or portions of computer programs executing on the processor circuit 410.
  • the apparatus 400 can be understood as comprising a radio transceiver circuit 420 configured to communicate with a wireless network and further comprising several functional modules implemented in processing circuitry 410, where each of the functional modules corresponds to one or several of the method steps described in any one or several of the wireless-device-related methods described above.
  • Figure 16 illustrates an example functional module or circuit architecture as may be implemented in the wireless device 400, e.g., based on the processing circuitry 410.
  • the illustrated embodiment at least functionally includes an uplink transmitting module 1602 for transmitting one or more scheduling requests on a first uplink serving cell.
  • the uplink transmitting module 1602 is also for, in response to not receiving an uplink grant after a predetermined number of scheduling requests on the first uplink serving cell and/or after a predetermined time interval, transmitting one or more scheduling requests on a second uplink serving cell.
  • the uplink transmitting module 1602 is for alternating transmission of one or more scheduling requests between a first uplink serving cell and a second uplink service cell according to a periodic pattern.
  • Figure 17 illustrates another example functional module or circuit architecture as may be implemented in the wireless device 400.
  • the illustrated embodiment at least functionally includes a first uplink transmitting module 1702 for transmitting one or more scheduling requests on a first uplink serving cell and a determining module 1704 for determining that the first uplink serving cell or a group of uplink serving cells that includes the first uplink serving cell has become less reliable than a second uplink serving cell for transmitting scheduling requests.
  • the implementation also includes a second uplink transmitting module 1706 for, in response to said determining, transmitting one or more scheduling requests on the second uplink serving cell.
  • the processing circuitry 420A can implement any one or more of the base-station- related methods described above using an arrangement of functional "modules," where the modules are computer programs or portions of computer programs executing on the processor circuitry 420 A.
  • the apparatus 401 A can be understood as comprising radio transceiver circuitry 41 OA configured to communicate with one or more wireless devices, and further comprising several functional modules implemented in processing circuitry 420 A, where each of the functional modules corresponds to one or several of the method steps described in any one or several of the base-station-related methods described above.
  • Figure 18 illustrates an example functional module or circuit architecture as may be implemented in the base station 401 A, e.g., based on the processing circuitry 420 A.
  • the illustrated embodiment at least functionally includes a detecting module 1802 for detecting one or more scheduling requests sent by a wireless device on a second uplink serving cell, wherein the second uplink serving cell is different than a first uplink serving cell on which the base station expects the one or more scheduling requests according to a scheduling request configuration for the wireless device.
  • the implementation also includes an action module 1804 for, in response to detecting the one or more scheduling requests sent by the wireless device on the second uplink serving cell, taking action to change a scheduling request priority or configuration for the wireless device to the second uplink serving cell from the first uplink serving cell.
  • Figure 19 illustrates another example functional module or circuit architecture as may be implemented in the base station 401 A.
  • the illustrated embodiment at least functionally includes a detecting module 1902 for detecting an event corresponding to a wireless device configured for uplink carrier aggregation and an evaluating module 1904 for, in response to said detecting, evaluating a scheduling request utilization for an uplink serving cell for which the wireless device is configured to send scheduling requests.
  • the implementation also includes a detecting module 1902 for detecting an event corresponding to a wireless device configured for uplink carrier aggregation and an evaluating module 1904 for, in response to said detecting, evaluating a scheduling request utilization for an uplink serving cell for which the wireless device is configured to send scheduling requests.
  • the implementation also includes a
  • determining module 1906 for determining whether to release scheduling request resources for the wireless device on the uplink serving cell, based on the scheduling request utilization.
  • Example embodiments have been described herein, with reference to block diagrams and/or flowchart illustrations of computer-implemented methods, apparatus (systems and/or devices) and/or computer program products. It is understood that a block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions that are performed by one or more computer circuits.
  • These computer program instructions may be provided to a processor circuit of a general purpose computer circuit, special purpose computer circuit, and/or other programmable data processing circuit to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, transform and control transistors, values stored in memory locations, and other hardware components within such circuitry to implement the functions/acts specified in the block diagrams and/or flowchart block or blocks, and thereby create means (functionality) and/or structure for implementing the functions/acts specified in the block diagrams and/or flowchart block(s).

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Abstract

Selon un aspect de l'invention, un dispositif sans fil prenant en charge une agrégation de porteuses de liaison montante transmet des demandes d'ordonnancement sur une première cellule de desserte de liaison montante, et détermine qu'aucune autorisation de liaison montante n'est reçue sur la première cellule de desserte de liaison montante ou que la première cellule de desserte de liaison montante est devenue moins fiable qu'une seconde cellule de desserte de liaison montante pour transmettre les demandes d'ordonnancement. En réponse, le dispositif sans fil transmet les demandes d'ordonnancement sur la seconde cellule de desserte de liaison montante. Selon un autre aspect, une station de base détecte des demandes d'ordonnancement envoyées par le dispositif sans fil sur une seconde cellule de desserte de liaison montante, la seconde cellule de desserte de liaison montante étant différente d'une première cellule de desserte de liaison montante sur laquelle la station de base attend les demandes d'ordonnancement. En réponse, la station de base prend des mesures pour changer la priorité de demande d'ordonnancement ou la configuration de demande d'ordonnancement du dispositif sans fil, afin qu'il passe de la première à la seconde cellule de desserte de liaison montante.
PCT/SE2016/050102 2015-02-12 2016-02-11 Mécanismes de demande d'ordonnancement dans une agrégation de porteuses Ceased WO2016130076A1 (fr)

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CN106488577A (zh) * 2016-09-26 2017-03-08 华为技术有限公司 传输信息的方法和用户设备
CN106488577B (zh) * 2016-09-26 2019-11-26 华为技术有限公司 传输信息的方法和用户设备
CN111030797A (zh) * 2017-05-04 2020-04-17 Oppo广东移动通信有限公司 调度请求传输控制方法及相关产品
CN111030797B (zh) * 2017-05-04 2021-03-02 Oppo广东移动通信有限公司 调度请求传输控制方法及相关产品
US20220256513A1 (en) * 2019-07-03 2022-08-11 Lg Electronics Inc. Method and apparatus for enhancing discontinuous reception procedure in wireless communication system to which for carrier aggregation scheme is applied
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EP3982680A1 (fr) * 2020-10-12 2022-04-13 T-Mobile USA, Inc. Optimisation de programmation de bande de liaison montante de spectre de plage de fréquences contiguës et non contiguës 1 (fr1) et de plage de fréquences 2 (fr2)
US20220116161A1 (en) * 2020-10-12 2022-04-14 T-Mobile Usa, Inc. Optimizing uplink band scheduling of contiguous and non-contiguous frequency range 1 (fr1) and frequency range 2 (fr2) spectrum
US11956165B2 (en) 2020-10-12 2024-04-09 T-Mobile Usa, Inc. Optimizing uplink band scheduling of contiguous and non-contiguous frequency range 1 (FR1) and frequency range 2 (FR2) spectrum
US20240204933A1 (en) * 2020-10-12 2024-06-20 T-Mobile Usa, Inc. Optimizing uplink band scheduling of contiguous and non-contiguous frequency range 1 (fr1) and frequency range 2 (fr2) spectrum
US12199891B2 (en) * 2020-10-12 2025-01-14 T-Mobile Usa, Inc. Optimizing uplink band scheduling of contiguous and non-contiguous frequency range 1 (FR1) and frequency range 2 (FR2) spectrum

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