WO2018174794A1 - Priorisation de puissance de liaison montante pour intervalle de temps de transmission court avec connaissance partielle d'informations de planification - Google Patents

Priorisation de puissance de liaison montante pour intervalle de temps de transmission court avec connaissance partielle d'informations de planification Download PDF

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Publication number
WO2018174794A1
WO2018174794A1 PCT/SE2018/050283 SE2018050283W WO2018174794A1 WO 2018174794 A1 WO2018174794 A1 WO 2018174794A1 SE 2018050283 W SE2018050283 W SE 2018050283W WO 2018174794 A1 WO2018174794 A1 WO 2018174794A1
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WIPO (PCT)
Prior art keywords
power
wireless device
tti
network node
indication
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PCT/SE2018/050283
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English (en)
Inventor
Laetitia Falconetti
Imadur RAHMAN
Mårten SUNDBERG
Dominique Everaere
Florent Munier
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2018174794A1 publication Critical patent/WO2018174794A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control

Definitions

  • This disclosure relates to wireless communications, and in particular, to uplink power prioritization for short transmission time interval (TTI) with partial knowledge of scheduling information.
  • TTI transmission time interval
  • Packet data latency is one of the performance metrics that vendors, operators and also end-users (via speed test applications) regularly measure. Latency measurements are done in all phases of a radio access network system lifetime, when verifying a new software release or system component, when deploying a system and when the system is in commercial operation.
  • LTE Long Term Evolution
  • Packet data latency is important not only for the perceived responsiveness of the system; it is also a parameter that indirectly influences the throughput of the system.
  • Hypertext transfer protocol/transmission control protocol is the dominating application and transport layer protocol suite used on the internet today.
  • HTTP Archive http://httparchive.org/trends.php
  • the typical size of HTTP based transactions over the internet are in the range of a few 10s of Kbytes up to 1 Mbyte.
  • the TCP slow start period is a significant part of the total transport period of the packet stream.
  • the performance is latency limited.
  • improved latency can rather easily be showed to improve the average throughput for this type of TCP based data transaction. Radio resource efficiency could be positively impacted by latency reductions.
  • TTI transmission time interval
  • OFDM orthogonal frequency division multiplex
  • SC-FDMA single carrier frequency division multiple access
  • the shorter TTIs can be decided to have any duration in time and comprise resources on a number of OFDM or SC-FDMA symbols within a 1 ms SF.
  • the duration of the short TTI may be 0.5 ms, i.e. seven OFDM or SC-FDMA symbols for the case with normal cyclic prefix.
  • the duration of the short TTI may be 2 symbols.
  • a short TTI of 7 OFDM or SC-FDMA symbols can also be referred to as a slot transmission, while a short TTI of 2 or 3 OFDM or SC-FDMA symbols can also be referred to as a subslot transmission.
  • FIG. 1 shows an example of the downlink (DL), i.e., from the network node to the wireless device, and uplink (UL), i.e., from the wireless device to the network node, sTTI pattern.
  • DL downlink
  • UL uplink
  • a LTE subframe composed of 14 OFDM or SC-FDMA symbols is divided into 6 subslots. Some of the subslots are of length 2 OFDM/SC-FDMA symbols, some of them are of length 3 OFDM/SC-FDMA symbols.
  • the present disclosure does not depend on the sTTI pattern, but FIG. 1 illustrates how it could look like for the example of LTE sTTI.
  • an UL grant sent in the DL will grant an UL transmission.
  • the UL grant is typically referred to as a Downlink control information (DO).
  • DO Downlink control information
  • the UL transmission is specified to take place after a specified time duration. As an example, for LTE and 2os sTTI, it is assumed that this processing time is 3 sTTI periods (also known as N+4 timing).
  • An UL grant sent in the DL sTTI N will grant an UL transmission in sTTI N+4.
  • Power Control for physical uplink shared channel (PUSCH) and short PUSCH (sPUSCH) Power control for PUSCH is defined in 3 GPP TS 36.213 as, for subframe i and serving cell c,
  • a TF c (/ ' ) is an adjustment factor depending on number of coded bits that is exactly specified in 3 GPP TS36.213.
  • f c (i) is the closed loop power control derived from what 5 PUSCH which is signaled to the wireless device in the UL grant.
  • Power control for sPUSCH has not been defined yet but is likely to be based on the power control of PUSCH. Similar equations and parameters as listed above can be used.
  • Power Control for physical uplink control channel (PUCCH) and sPUCCH Power control for PUCCH is defined in 3GPP TS36.213 as, for subframe i and serving cell c, + A w (F' ) + g ⁇ i) for PUCCH format l/la/lb/2/2a/2b/3 and
  • ⁇ CMA3 ⁇ 4( is th e maximum transmit power.
  • p 0 PUCCH is the target of received power.
  • - PI is the downlink path loss estimate.
  • h(n CQI , n HARQ , n SR ) is a PUCCH format dependent value that reflects cases with larger payload.
  • p UCCH ,(/ ' ) is the number of resource blocks for PUCCH format 5, equals 1 for all other formats.
  • - ⁇ F P ⁇ cCH (F ) is a relation in dB between PUCCH format F and PUCCH format la.
  • a TF c (i) is an adjustment factor depending on number of coded bits that is exactly specified in 3 GPP TS36.213.
  • a TxD (F') depends on the number of antenna ports configured for PUCCH.
  • g (i) is the closed loop power control state and is updated using ⁇ 3 ⁇ 4>UCCH signalled in the downlink assignment.
  • the power control for sPUCCH has not been defined yet but is likely to be based on the power control of PUCCH. Similar equation and parameters as listed above can be used.
  • the UL power is distributed among the uplink physical channels according to the following priority:
  • UCI UL control Information
  • a wireless device may have received UL grants for overlapping or parallel shorter TTI UL transmission and longer TTI UL transmission. This may happen on the same carrier or, more likely, this may happen on different carriers.
  • FIG. 2 The case of overlapping/parallel transmissions for LTE is exemplified in FIG. 2 where a 1ms TTI UL transmission is scheduled for wireless device 0 on carrier 0 and a sTTI UL transmission is scheduled in the same subframe for the same wireless device on carrier 1.
  • the 'UL data Tx for 1ms ⁇ and the 'UL data Tx for sTTF is overlapping in time.
  • a short TTI is called a mini-slot in the New Radio (NR) access technology and in NR, a TTI is called a slot and is not always 1 ms in duration.
  • NR New Radio
  • the term sTTI may refer to mini- slot in NR and the term TTI or 1ms TTI, as used herein, may refer to a slot in NR.
  • NR also defines a 1ms subframe, that is different from an NR 1ms TTI slot If a wireless device is not power limited or if a wireless device is power limited but is aware of all overlapping UL transmissions on 1ms TTI and sTTI in a subframe, the methods given in the other disclosure for setting the power for 1ms UL TTI and the power for UL sTTI work well.
  • the UL data transmission for 1ms TTI may have already started when the UL grant for an UL 2os TTI in the same subframe is received by the wireless device, as seen in the figure below. So, the wireless device has to be able to set the power for 1ms TTI without knowing if a 2os TTI will be scheduled in the same subframe duration or not. In that case, the methods may result in power variation at any time in a subframe on the carrier with 1ms TTI allocated, which is unwanted for proper demodulation of the 1ms TTI channel.
  • Some embodiments advantageously provide, a wireless device, a network node and corresponding methods to allocate UL power between channels sent on different TTI lengths, e.g., sTTI channels and 1ms TTI channels, for wireless devices that do not necessarily know if an UL transmission of shorter duration will overlap with an already scheduled UL transmission of longer TTI duration. This is relevant when wireless devices are power limited and are likely to use up their power for one of the TTI lengths, leaving no power for the other TTI that may be scheduled later.
  • new power control parameters referring to guaranteed power are introduced.
  • This can be a guaranteed power for groups of TTI lengths, e.g., a guaranteed power for 1ms TTI and a guaranteed power for all short TTI lengths together. Or it can be a guaranteed power per TTI length.
  • the sum of the guaranteed powers for sTTI and 1ms TTI is less than to the maximum allowed power of the wireless device.
  • the guaranteed power parameters are either radio resource control (RRC) configured or indicated with LI signaling, e.g., in the UL grant. If the guaranteed power parameters are RRC configured, an additional control signaling for adjusting the value or the usage of the RRC configured guaranteed power parameters can be indicated with LI signaling, e.g. in the UL grant.
  • a method in a wireless device for regulating power to be allocated to transmission time intervals, TTIs, the wireless device supporting short TTIs of duration less than a subframe includes for each of at least one TTI to be transmitted during a subframe, allocating a power P n at which to transmit during the TTI such that a total of all power allocations at a pre-determined time interval is less than a maximum power Pmax.
  • the pre-determined time interval is a short TTI.
  • the total of all power allocations is a total over a plurality of carriers.
  • the power P n is allocated according to a predefined rule.
  • the power P n is based on power control statistics in the wireless device.
  • the power allocations are based on information received from a network node serving the wireless device.
  • the information received from a network node serving the wireless device is received in an RRC configuration and includes a level of the power Pn.
  • the information received from a network node serving the wireless device is received in a downlink control information, DCI, and includes an indication of for which TTIS the wireless device is to allocate a power Pn.
  • the power allocations are based on the combination of the information received from a network node in a RRC configuration and the information received from a network node in a downlink control information.
  • a wireless device for regulating power to be allocated to transmission time intervals, TTIs, the wireless device supporting short TTIs of duration less than a subframe.
  • the wireless device includes processing circuitry configured to, for each of at least one TTI to be transmitted during a subframe, allocate a power P n at which to transmit during the TTI such that total of all power allocations at a pre-determine time interval is less than a maximum power Pmax.
  • the pre-determined time interval is a short TTI.
  • the total of all power allocations is a total over a plurality of carriers.
  • the power P n is allocated according to a predefined rule.
  • the power P n is based on power control statistics in the wireless device.
  • the power allocations are based on information received from a network node serving the wireless device.
  • the information received from a network node serving the wireless device is received in an RRC configuration and includes a level of the power Pn.
  • the information received from a network node serving the wireless device is received in a downlink control information, DCI, and includes an indication of for which TTIs the wireless device is to allocate a power Pn.
  • the power allocations are based on the combination of the information received from a network node in a RRC configuration and the information received from a network node in a downlink control information
  • a wireless device for regulating power to be allocated to transmission time intervals, TTIs, the wireless device supporting short TTIs of duration less than a subframe.
  • the wireless device includes a power allocation module configured to, for each of at least one TTI to be transmitted during a subframe, allocate a power Pn at which to transmit during the TTI such that a total of all power allocations at a pre-determined time interval is less than a maximum power Pmax.
  • a method in a network node for providing information concerning power to be allocated to a plurality of transmission time intervals, TTIs, transmitted by a wireless device includes for each of at least one TTI to be transmitted by the wireless device during a subframe, generating an indication of an amount of power i n at which to transmit the TTI such that a total of all power allocations at a pre-determined time interval is less than a maximum power Pmax.
  • the method further includes transmitting the at least one indication to the wireless device.
  • the pre-determined time interval is a short TTI.
  • the total of all power allocations is a total over a plurality of carriers.
  • the at least one indication is a percentage of the maximum power Pmax.
  • the at least one indication includes a length of the TTI to which the indication corresponds.
  • the at least one indication is transmitted with an uplink grant.
  • the at least one indication is transmitted with a downlink assignment.
  • the sum of the indicated percentage of the maximum power Pmax of all TTIs is strictly smaller than the maximum power Pmax.
  • the sum of the indicated percentage of the maximum power Pmax for all TTIs is strictly smaller than the maximum power Pmax and wherein the difference between the sum and the maximum power Pmax is to be shared among all TTIs.
  • a network node configured to provide providing information concerning power to be allocated to a plurality of transmission time intervals, TTIs, transmitted by a wireless device.
  • the network node includes, processing circuitry configured to, for each of at least one TTI to be transmitted by the wireless device during a subframe, generate an indication of an amount of allocated power P n at which to transmit the TTI such that a total of all power allocations at a pre-determined time interval is less than a maximum power Pmax.
  • the network node also includes a transmitter configured to transmit the at least one indication to the wireless device.
  • the pre-determined time interval is a short TTI.
  • the total of all power allocations is a total over a plurality of carriers.
  • the at least one indication is a percentage of the maximum power Pmax.
  • the at least one indication includes a length of the TTI to which the indication corresponds.
  • the at least one indication is transmitted with a downlink control information such as an uplink grant.
  • the at least one indication is transmitted with a downlink assignment.
  • the sum of the indicated percentage of the maximum power Pmax of all TTIs is strictly smaller than the maximum power Pmax.
  • the sum of the indicated percentage of the maximum power Pmax for all TTIs is strictly smaller than the maximum power Pmax and wherein the difference between the sum and the maximum power Pmax is to be shared among all TTIs.
  • a network node configured to provide providing information concerning power to be allocated to a plurality of transmission time intervals, TTIs, transmitted by a wireless device.
  • the network node includes a power indication generator module configured to, for each of at least one TTI to be transmitted by the wireless device during a subframe, generate an indication of an amount of power P n at which to transmit the TTI such that a total of all power allocations at a pre-determined time interval is less than a maximum power Pmax.
  • the network node further includes a transmitter module configured to transmit the at least one indication to the wireless device.
  • FIG. 1 shows an example of the downlink and uplink sTTI pattern
  • FIG. 2 shows the case of overlapping/parallel transmissions for LTE
  • FIG. 3 is a block diagram of a wireless communication system constructed in accordance with principles set forth herein;
  • FIG. 4 is a block diagram of a network node configured according to principles set forth herein;
  • FIG. 5 is a block diagram of an alternative embodiment of the network node, which may include software modules executable by a processor;
  • FIG. 6 is a block diagram of a wireless device, which includes processing circuitry;
  • FIG. 7 is a block diagram of an alternative embodiment of the wireless device which may include software modules executable by a processor
  • FIG. 8 is a flowchart of an exemplary process in a wireless device for regulating power to be allocated to transmission time intervals
  • FIG. 9 is a flowchart of an exemplary process in a network node for providing information to a wireless device concerning power to be allocated to a plurality of TTIs
  • FIG. 10 shows an example of how the wireless device uses the guaranteed power parameters for setting the UL power for two carriers, one carrier with a 1ms TTI and the second carrier with a 2os TTI
  • FIG. 11 shows a first carrier with a 1ms TTI and a second carrier with a 2os TTI; and
  • FIG. 12 illustrates the outcome of a dynamic adjustment or usage of the guaranteed power parameters.
  • Some embodiments provided herein enable wireless devices to distribute its power optimally in case the wireless device does not have enough power for a longer transmission, e.g., 1ms TTI channels and one or more shorter transmission, e.g., sTTI, channels and does not have all scheduling information about overlapping UL transmissions available when computing its total power and power across multiple carriers.
  • ⁇ means a transmission duration and, thus, an sTTI refers to a short transmission duration.
  • LTE allows sTTI channels that are scheduled at a point in time where the wireless device is not able to consider the power of the sTTI allocation before starting a 1 ms transmission to still have adequate power.
  • embodiments are not limited to LTE and the discussion of LTE herein is solely to aid understanding.
  • Some embodiments consider the scenario where a wireless device is scheduled on multiple carriers with potentially different TTI lengths on the different carriers.
  • TTIl and TTI2 can have any values such as 1ms, 70S, 20S.
  • One of the carriers may have a TTI of longer duration.
  • the wireless device set the power for the carrier with longer TTI, e.g., 1ms
  • a parameter referring to a guaranteed power is introduced for the longer TTI and for the shorter TTI.
  • Pmax the maximum allowed Tx power of the wireless device
  • ⁇ the guaranteed power for the longer TTI
  • ⁇ 2 the guaranteed power for the shorter TTI.
  • the sum of ⁇ and ⁇ 2 must be smaller than Pmax, such that the remaining power Pmax - ⁇ - ⁇ 2 can be shared among the carrier with the shorter TTI and the carrier with the longer TTI UL transmissions.
  • FIG. 3 a block diagram of a wireless communication system 10.
  • the wireless communication network 10 includes a cloud 12 which may include the Internet and/or the public switched telephone network (PSTN). Cloud 12 may also serve as a backhaul network of the wireless communication network 10.
  • PSTN public switched telephone network
  • communication network 10 includes one or more network nodes 14A and 14B, which may communicate directly via an X2 interface in LTE embodiments, and are referred to collectively as network nodes 14. It is contemplated that that other interface types can be used for communication between network nodes 14 for other communication protocols such as New Radio (NR).
  • the network nodes 14 may serve wireless devices 16A and 16B, referred to collectively herein as wireless devices 16. Note that, although only two wireless devices 16 and two network nodes 14 are shown for convenience, the wireless
  • wireless communication network 10 may typically include many more wireless devices (WDs) 16 and network nodes 14.
  • the term "wireless device” or mobile terminal used herein may refer to any type of wireless device communicating with a network node 14 and/or with another wireless device 16 in a cellular or mobile communication system 10.
  • Examples of a wireless device 16 are user equipment (UE), target device, device to device (D2D) wireless device, machine type wireless device or wireless device capable of machine to machine (M2M) communication, PDA, tablet, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongle, etc.
  • network node used herein may refer to any kind of radio base station in a radio network which may further comprise any base transceiver station (BTS), base station controller (BSC), radio network controller (RNC), evolved Node B (eNB or eNodeB), NR gNodeB, NR gNB, Node B, multi- standard radio (MSR) radio node such as MSR BS, relay node, donor node controlling relay, radio access point (AP), transmission points, transmission nodes, Remote Radio Unit (RRU) Remote Radio Head (RRH), nodes in distributed antenna system (DAS), etc.
  • BTS base transceiver station
  • BSC base station controller
  • RNC radio network controller
  • eNB or eNodeB evolved Node B
  • NR gNodeB NR gNodeB
  • Node B multi- standard radio (MSR) radio node such as MSR BS, relay node, donor node controlling relay, radio access point (AP), transmission points, transmission nodes, Remote Radio Unit (R
  • a network node 14 has a power indicator unit 18 which is configured to, for each of at least one TTI to be transmitted by the wireless device during a subframe, generate an indication of an amount of power Pn at which to transmit the TTI such that the total of all power allocations is less than a maximum power Pmax.
  • the power Pn may be signaled using radio resource control (RRC) signaling.
  • RRC radio resource control
  • the indications of power may be percentages of the maximum power Pmax and may further include specified lengths of the TTIs corresponding to the indications.
  • the wireless device 16 includes a power allocation unit 20 configured to, for each of at least one TTI to be transmitted during a subframe, allocate a power P n at which to transmit during the TTI, such that the total of all power allocations is less than a maximum power Pmax.
  • a power allocation unit 20 configured to, for each of at least one TTI to be transmitted during a subframe, allocate a power P n at which to transmit during the TTI, such that the total of all power allocations is less than a maximum power Pmax.
  • which TTIs for which the wireless device 16 is to allocate Pn may be signaled in downlink control information (DCI).
  • DCI downlink control information
  • the power Pn may be allocated according to a predefined rule or based on power control statistics stored in the wireless device.
  • FIG. 4 is a block diagram of a network node 14 configured according to principles set forth herein.
  • the network node 14 includes processing circuitry 22.
  • the processing circuitry 22 may include a memory 24 and processor 26, the memory 24 containing instructions which, when executed by the processor 26, configure processor 26 to perform the one or more functions described herein.
  • processing circuitry 22 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field
  • ASIC Application Specific Integrated Circuitry
  • Processing circuitry 22 may include and/or be connected to and/or be configured for accessing (e.g., writing to and/or reading from) memory 24, which may include any kind of volatile and/or non-volatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 24 may be configured to store code executable by control circuitry and/or other data, e.g., data pertaining to communication, e.g., configuration and/or address data of nodes, etc.
  • Processing circuitry 22 may be configured to control any of the methods described herein and/or to cause such methods to be performed, e.g., by processor 26. Corresponding instructions may be stored in the memory 24, which may be readable and/or readably connected to the processing circuitry 22.
  • processing circuitry 22 may include a controller, which may comprise a
  • processing circuitry 22 includes or may be connected or connectable to memory, which may be configured to be accessible for reading and/or writing by the controller and/or processing circuitry 22.
  • the memory 24 is configured to store power indications 28 that may be determined based on lengths of TTIs to be granted to the wireless device 16 and based on Pmax.
  • the power indicator unit 18 of the processor 26 may be configured to, for each of at least one TTI to be transmitted by the wireless device during a subframe, generate an indication of an amount of allocated power Pn at which to transmit the TTI such that the total of all power allocations is less than a maximum power Pmax.
  • a transceiver 34 may be configured to transmit the at least one indication to the wireless device 16.
  • FIG. 5 is a block diagram of an alternative embodiment of the network node 14, which may include software modules executable by a processor.
  • the memory module 25 is configured to store the power indications 28 generated by the power indicator module 19 and signaled to the wireless device 16 by the transceiver module 35.
  • the modules 19 and 35 may be implemented by hardware specially adapted to achieve the functions of these modules. Such hardware may include, for example, application specific integrated circuitry (ASIC) or a field programmable gate array (FPGA).
  • ASIC application specific integrated circuitry
  • FPGA field programmable gate array
  • FIG. 6 is a block diagram of a wireless device 16, which includes processing circuitry 42.
  • the processing circuitry 42 may include a memory 44 and processor 46, the memory 44 containing instructions which, when executed by the processor 46, configure processor 46 to perform the one or more functions described herein.
  • processing circuitry 42 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry).
  • Processing circuitry 42 may include and/or be connected to and/or be configured for accessing (e.g., writing to and/or reading from) memory 44, which may include any kind of volatile and/or non-volatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 44 may be configured to store code executable by control circuitry and/or other data, e.g., data pertaining to communication, e.g., configuration and/or address data of nodes, etc.
  • Processing circuitry 42 may be configured to control any of the methods described herein and/or to cause such methods to be performed, e.g., by processor 46.
  • Corresponding instructions may be stored in the memory 44, which may be readable and/or readably connected to the processing circuitry 42.
  • processing circuitry 42 may include a controller, which may comprise a
  • processing circuitry 42 includes or may be connected or connectable to memory, which may be configured to be accessible for reading and/or writing by the controller and/or processing circuitry 42.
  • the memory 44 is configured to store power allocations 48 generated by the power allocation unit 20.
  • the power allocation unit 20 is configured to, for each of at least one TTI to be transmitted during a subframe, allocate a power P n at which to transmit during the TTI, such that the total of all power allocations is less than a maximum power Pmax.
  • the transceiver 54 is configured to transmit during each TTI with the corresponding allocated power.
  • FIG. 7 is a block diagram of an alternative embodiment of the wireless device 16 which may include software modules executable by a processor.
  • the memory module 45 is configured to store the power allocations 48 generated by the power allocation module 21 and signaled to the wireless device 16 by the transceiver module 55.
  • the modules 21 and 55 may be implemented by hardware specially adapted to achieve the functions of these modules. Such hardware may include, for example, application specific integrated circuitry (ASIC) or a field programmable gate array (FPGA).
  • FIG. 8 is a flowchart of an exemplary process in a wireless device 16 for regulating power to be allocated to transmission time intervals, TTIs, the wireless device 16 supporting short TTIs of duration less than a subframe.
  • ASIC application specific integrated circuitry
  • FPGA field programmable gate array
  • the process includes, for each of at least one TTI to be transmitted during a subframe, allocating, via the power allocation unit 20, a power Pn at which to transmit during the TTI, such that the total of all power allocations is less than a maximum power Pmax (block SI 00).
  • the process may optionally include transmitting, via the transceiver 54, during TTIs according to the allocated power (block SI 02).
  • FIG. 9 is a flowchart of an exemplary process in a network node 14 for providing information to a wireless device 16 concerning power to be allocated to a plurality of TTIs.
  • the process includes, for each of at least one TTI to be transmitted by the wireless device 16 during a subframe, generating via the power indicator unit 18, an indication of an amount of power i n at which to transmit the TTI such that the total of all power allocations is less than a maximum power Pmax (block SI 04).
  • the process also includes transmitting via the transceiver 34 the at least one indication to the wireless device 16 (block SI 06)
  • FIG. 10 shows an example of how the wireless device 16 uses the guaranteed power parameters for setting the UL power for two carriers, one carrier with a 1ms TTI and the second carrier with a 2os TTI.
  • the wireless device 16 is not aware that the last UL 2os TTI of the subframe is scheduled on the second carrier.
  • the wireless device 16 thus allocates the power for the carrier with 1ms TTI channels assuming a budget of the guaranteed power for 1ms TTI (i.e. ⁇ ) + the shared remaining power (Pmax - ⁇ - ⁇ 2), assuming it needs it.
  • the power budget for the carrier with 1ms TTI transmissions in this subframe is equal to Pmax - ⁇ 2.
  • the wireless device 16 receives the UL grant for the last sTTI of the subframe, the wireless device 16 still has the guaranteed power for sTTI to allocate for the scheduled 2os TTI transmission on the second carrier.
  • the wireless device 16 uses the shared remaining power to transmit a signal during the 1ms TTI, but in another example, the shared power could be used to transmit a signal during the sTTI period (depending on priority, scheduling rules, etc.) Within the power budget set by the guaranteed power parameters, the wireless device
  • 16 power is allocated to the different UL channels of the same TTI length sent at the same time as known from LTE Rel-14 rules that are described briefly above.
  • This guaranteed power parameter can be defined per TTI length. If a wireless device 16 is configured with or supporting multiple TTI lengths, each of the TTI lengths can be configured with a guaranteed power. Irrespective of the power allocation, the total guaranteed power across all TTI lengths should be smaller than the maximum allowed power, Pmax.. In other words, the total power of the TTIs that may be transmitted at the same time cannot exceed Pmax. As a second embodiment, the guaranteed power can be configured on a per TTI length group basis. In another embodiment, the guaranteed power parameter can be defined per carrier. This would work well if the TTI length is rarely changed on a carrier.
  • each of the TTI length can be configured with a guaranteed power ( ⁇ 2, ⁇ 7, ⁇ respectively for 2os, 7os and 1ms TTI). In that case, ⁇ 2 + ⁇ 7 + ⁇ should be smaller or equal than Pmax.
  • the values for the guaranteed powers can be semi-statically configured.
  • the parameter can take the form of a quantified share of the power grant (a percentage, for example).
  • the power share can be fixed by specification and derived based on a set of rules, e.g. number of parallel TTI and sTTI, number of carriers, etc.
  • the value of the guaranteed powers may also be determined based on UL resource allocation, such that, higher transmission bandwidth in any carrier may require higher guaranteed power.
  • the wireless device 16 may autonomously adjust the guaranteed power for any carrier with certain TTI pattern based on any predefined rule or based on power control statistics in the wireless device. For example, a carrier requiring higher power for sustainable period of time can be allocated a higher guaranteed power.
  • FIG. 11 continues the example given in FIG. 10, with a first carrier with a 1ms TTI and a second carrier with a 2os TTI.
  • the wireless device 16 When setting the power for the 1ms TTI transmissions scheduled in subframe n on a first carrier, the wireless device 16 does not know if a sTTI transmission is scheduled in the same subframe on the second carrier and it limits the power of the 1ms TTI to the Pmax - ⁇ 2 budget mentioned in the above.
  • a network node such as a base station or e B, could dynamically or semi-statically signal information about the guaranteed power for the UL transmission.
  • This information can be sent in the UL grant of the scheduled UL transmission or it can be sent in another LI signaling for instance on the physical downlink control channel
  • PDCCH Physical Downlink Control Channel
  • This information can refer to the TTI length for which the UL grant is sent and/or for the other configured UL TTI lengths.
  • LI signaling e.g., the UL grant
  • LI signaling could indicate further refinement of the pre-configured guaranteed power. For instance, an adjustment (a delta) to the guaranteed power could be signaled in the UL grant.
  • LI signaling e.g., the UL grant
  • the wireless device 16 assumes that full power can be used for the granted UL transmission if it does not receive scheduling information about concurrent UL transmissions for the same subframe in a timely manner.
  • This issue can also be solved without additional signaling for the power allocation of the shortest configured UL TTI length, e.g. 2os TTI.
  • This is based on autonomous decision at the wireless device 16 based on the available UL grants.
  • a rule can be defined so that the 2os TTI length transmission can use the maximum allowed power as long as it is the only scheduled TTI length known (to the wireless device).
  • This rule could be: when setting the power of the shortest configured TTI length, the wireless device 16 ignores the constraints given by the configured/signaled guaranteed power if no other UL
  • FIG. 12 illustrates the outcome of a dynamic adjustment or usage of the guaranteed power parameters.
  • the UL grant for 1ms TTI scheduled in subframe n indicates that full power can be used for 1ms TTI while the UL grant for 1ms TTI scheduled in subframe n+2 indicated that the constraints provided by the guaranteed power parameters apply.
  • a method in a wireless device 16 for regulating power to be allocated to transmission time intervals, TTIs, the wireless device 16 supporting short TTIs of duration less than a subframe includes for each of at least one TTI to be transmitted during a subframe, allocating a power P n at which to transmit during the TTI such that the total of all power allocations at a pre-determined time interval is less than a maximum power Pmax (SI 00).
  • the pre-determined time interval is a short TTI.
  • the total of all power allocations is a total over a plurality of carriers.
  • the power P n is allocated according to a predefined rule.
  • the power P n is based on power control statistics in the wireless device 16.
  • the power allocations are based on information received from a network node 14 serving the wireless device.
  • the information received from a network node 14 serving the wireless device 16 is received in an RRC configuration and includes a level of the power Pn.
  • the information received from a network node 14 serving the wireless device 16 is received in a downlink control
  • the power allocations are based on the combination of the information received from a network node 14 in a RRC configuration and the information received from a network node 14 in a downlink control information.
  • a wireless device 16 for regulating power to be allocated to transmission time intervals, TTIs, the wireless device 16 supporting short TTIs of duration less than a subframe.
  • the wireless device 16 includes processing circuitry 42 configured to, for each of at least one TTI to be transmitted during a subframe, allocate a power Pn at which to transmit during the TTI such that the total of all power allocations at a pre-determine time interval is less than a maximum power Pmax.
  • the pre-determined time interval is a short TTI.
  • the total of all power allocations is a total over a plurality of carriers.
  • the power P n is allocated according to a predefined rule.
  • the power P n is based on power control statistics in the wireless device 16.
  • the power allocations are based on information received from a network node 14 serving the wireless device.
  • the information received from a network node 14 serving the wireless device 16 is received in an RRC configuration and includes a level of the power Pn.
  • the information received from a network node 14 serving the wireless device 16 is received in a downlink control
  • the power allocations are based on the combination of the information received from a network node 14 in a RRC configuration and the information received from a network node 14 in a downlink control information
  • a wireless device 16 for regulating power to be allocated to transmission time intervals, TTIs, the wireless device 16 supporting short TTIs of duration less than a subframe.
  • the wireless device 16 includes a power allocation module 21 configured to, for each of at least one TTI to be transmitted during a subframe, allocate a power P n at which to transmit during the TTI such that the total of all power allocations at a pre-determined time interval is less than a maximum power Pmax.
  • the method includes for each of at least one TTI to be transmitted by the wireless device 16 during a subframe, generating an indication of an amount of power Pn at which to transmit the TTI such that the total of all power allocations at a pre-determined time interval is less than a maximum power Pmax (SI 04). The method further includes transmitting the at least one indication to the wireless device 16 (SI 06).
  • the pre-determined time interval is a short TTI.
  • the total of all power allocations is a total over a plurality of carriers.
  • the at least one indication is a percentage of the maximum power Pmax.
  • the at least one indication includes a length of the TTI to which the indication corresponds.
  • the at least one indication is transmitted with an uplink grant.
  • the at least one indication is transmitted with a downlink assignment.
  • the sum of the indicated percentage of the maximum power Pmax of all TTIs is strictly smaller than the maximum power Pmax.
  • the sum of the indicated percentage of the maximum power Pmax for all TTIs is strictly smaller than the maximum power Pmax and wherein the difference between the sum and the maximum power Pmax is to be shared among all TTIs.
  • a network node 14 configured to provide providing information concerning power to be allocated to a plurality of transmission time intervals, TTIs, transmitted by a wireless device.
  • the network node 14 includes, processing circuitry 22 configured to, for each of at least one TTI to be transmitted by the wireless device 16 during a subframe, generate an indication of an amount of allocated power P n at which to transmit the TTI such that the total of all power allocations at a pre-determined time interval is less than a maximum power Pmax.
  • the network node also includes a transmitter 34 configured to transmit the at least one indication to the wireless device 16.
  • the pre-determined time interval is a short TTI.
  • the total of all power allocations is a total over a plurality of carriers.
  • the at least one indication is a percentage of the maximum power Pmax.
  • the at least one indication includes a length of the TTI to which the indication corresponds.
  • the at least one indication is transmitted with a downlink control information such as an uplink grant.
  • the at least one indication is transmitted with a downlink assignment.
  • the sum of the indicated percentage of the maximum power Pmax of all TTIs is strictly smaller than the maximum power Pmax.
  • the sum of the indicated percentage of the maximum power Pmax for all TTIs is strictly smaller than the maximum power Pmax and wherein the difference between the sum and the maximum power Pmax is to be shared among all TTIs.
  • a network node 14 configured to provide providing information concerning power to be allocated to a plurality of transmission time intervals, TTIs, transmitted by a wireless device 16.
  • the network node 14 includes a power indication generator module 19 configured to, for each of at least one TTI to be transmitted by the wireless device 16 during a subframe, generate an indication of an amount of power P n at which to transmit the TTI such that the total of all power allocations at a pre-determined time interval is less than a maximum power Pmax.
  • the network node 14 further includes a transmitter module 35 configured to transmit the at least one indication to the wireless device 16.
  • Some embodiments include the following.
  • Embodiment 1 A method in a wireless device for regulating power to be allocated to transmission time intervals, TTIs, the wireless device supporting short TTIs of duration less than a subframe, the method comprising: for each of at least one TTI to be transmitted during a subframe, allocating a power P n at which to transmit during the TTI such that the total of all power allocations is less than a maximum power Pmax.
  • Embodiment 2. The method of Embodiment 1, wherein the power P n is allocated according to a predefined rule.
  • Embodiment 3 The method of Embodiment 1, wherein the power P n is based on power control statistics in the wireless device.
  • Embodiment 4 The method of Embodiment 1, wherein the power allocations are based on information received from a network node serving the wireless device.
  • Embodiment 5 The method of Embodiment 4, wherein the information received from a network node serving the wireless device is received in an RRC
  • Embodiment 6 The method of Embodiment 4, wherein the information received from a network node serving the wireless device is received in a downlink control information, DCI.
  • Embodiment 7 The method of Embodiment 4, wherein the power allocations are based on the combination of the information received from a network node in a RRC configuration and the information received from a network node in a downlink control information
  • Embodiment 8 A wireless device for regulating power to be allocated to transmission time intervals, TTIs, the wireless device supporting short TTIs of duration less than a subframe, the wireless device comprising:
  • processing circuitry configured to, for each of at least one TTI to be transmitted during a subframe, allocate a power P n at which to transmit during the TTI such that the total of all power allocations is less than a maximum power Pmax.
  • Embodiment 9 The wireless device of Embodiment 8, wherein the power P n is allocated according to a predefined rule.
  • Embodiment 10 The wireless device of Embodiment 8, wherein the power P n is based on power control statistics in the wireless device.
  • Embodiment 11 The wireless device of Embodiment 8, wherein the power allocations are based on information received from a network node serving the wireless device.
  • Embodiment 12 The wireless device of Embodiment 11, wherein the information received from a network node serving the wireless device is received in an RRC configuration.
  • Embodiment 13 The wireless device of Embodiment 11, wherein the information received from a network node serving the wireless device is received in a downlink control information, DCI.
  • Embodiment 14 The wireless device of Embodiment 11, wherein the power allocations are based on the combination of the information received from a network node in a RRC configuration and the information received from a network node in a downlink control information
  • Embodiment 15 A wireless device for regulating power to be allocated to transmission time intervals, TTIs, the wireless device supporting short TTIs of duration less than a subframe, the wireless device comprising:
  • a power allocation module configured to, for each of at least one TTI to be transmitted during a subframe, allocate a power P n at which to transmit during the TTI such that the total of all power allocations is less than a maximum power Pmax.
  • Embodiment 16 A method in a network node for providing information concerning power to be allocated to a plurality of transmission time intervals, TTIs, transmitted by a wireless device, the method comprising:
  • Embodiment 17 The method of Embodiment 16, wherein the at least one indication is a percentage of the maximum power Pmax.
  • Embodiment 18 The method of any of Embodiments 16 and 17, wherein the at least one indication includes a length of the TTI to which the indication corresponds.
  • Embodiment 19 The method of any of Embodiments 16-18, wherein the at least one indication is transmitted with an uplink grant.
  • Embodiment 20 The method of any of Embodiments 16-118, wherein the at least one indication is transmitted with a downlink assignment.
  • Embodiment 21 The method of Embodiment 16-19, wherein the sum of the indicated percentage of the maximum power Pmax of all TTIs is strictly smaller than the maximum power Pmax.
  • Embodiment 22 The method of Embodiment 19, wherein the sum of the indicated percentage of the maximum power Pmax for all TTIs is strictly smaller than the maximum power Pmax and wherein the difference between the sum and the maximum power Pmax is to be shared among all TTIs.
  • Embodiment 23 A network node configured to provide providing information concerning power to be allocated to a plurality of transmission time intervals, TTIs, transmitted by a wireless device, the network node comprising:
  • Embodiment 24 The network node of Embodiment 23, wherein the at least one indication is a percentage of the maximum power Pmax.
  • Embodiment 25 The network node of any of Embodiments 23 and 24, wherein the at least one indication includes a length of the TTI to which the indication corresponds.
  • Embodiment 26 The network node of any of Embodiments 23-25, wherein the at least one indication is transmitted with a downlink control information such as an uplink grant.
  • Embodiment 27 The network node of any of Embodiments 23-25, wherein the at least one indication is transmitted with a downlink assignment.
  • Embodiment 28 The network node of Embodiment 23-26, wherein the sum of the indicated percentage of the maximum power Pmax of all TTIs is strictly smaller than the maximum power Pmax.
  • Embodiment 29 The network node of Embodiment 26, wherein the sum of the indicated percentage of the maximum power Pmax for all TTIs is strictly smaller than the maximum power Pmax and wherein the difference between the sum and the maximum power Pmax is to be shared among all TTIs.
  • Embodiment 30 A network node configured to provide providing information concerning power to be allocated to a plurality of transmission time intervals, TTIs, transmitted by a wireless device, the network node comprising:
  • a power indication generator module configured to, for each of at least one TTI to be transmitted by the wireless device during a subframe, generate an indication of an amount of power Pn at which to transmit the TTI such that the total of all power allocations is less than a maximum power Pmax;
  • a transmitter module configured to transmit the at least one indication to the wireless device.
  • PRB Physical Resource Block PUSCH Physical Uplink Shared Channel RAT Radio Access Technology RB Resource Block
  • SC-FDMA Single Carrier- Frequency Division Multiple Access sPDCCH short Physical Downlink Control Channel sPDSCH short Physical Downlink Shared Channel sPUSCH short Physical Uplink Shared Channel
  • the concepts described herein may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects all generally referred to herein as a "circuit" or "module.”
  • the disclosure may take the form of a computer program product on a tangible computer usable storage medium having computer program code embodied in the medium that can be executed by a computer. Any suitable tangible computer readable medium may be utilized including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.
  • These computer program instructions may also be stored in a computer readable memory or storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. It is to be understood that the functions/acts noted in the blocks may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Although some of the diagrams include arrows on communication paths to show a primary direction of
  • Computer program code for carrying out operations of the concepts described herein may be written in an object-oriented programming language such as Java® or C++.
  • the computer program code for carrying out operations of the disclosure may also be written in conventional procedural programming languages, such as the "C" programming language.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer.
  • the remote computer may be connected to the user's computer through a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider for example, AT&T, MCI, Sprint, EarthLink, MSN, GTE, etc.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé, un dispositif sans fil et un nœud de réseau permettant de réguler la puissance à attribuer à des intervalles de temps de transmission, TTI. Selon un mode de réalisation, un dispositif sans fil prend en charge des TTI courts de durée inférieure à une sous-trame, et pour chacun d'au moins un TTI devant être transmis pendant une sous-trame, le dispositif sans fil attribue une puissance Pn à laquelle transmettre pendant le TTI, de sorte que le total de toutes les attributions de puissance à un intervalle de temps prédéterminé soit inférieur à une puissance maximale Pmax.
PCT/SE2018/050283 2017-03-24 2018-03-20 Priorisation de puissance de liaison montante pour intervalle de temps de transmission court avec connaissance partielle d'informations de planification WO2018174794A1 (fr)

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CN111586819A (zh) * 2019-02-15 2020-08-25 华为技术有限公司 一种上行保证功率信息发送、接收方法及设备
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WO2024152307A1 (fr) * 2023-01-19 2024-07-25 Telefonaktiebolaget Lm Ericsson (Publ) Procédé et appareils pour la transmission sans fil

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