WO2013067693A1 - Gestion efficace d'une puissance de transmission limitée dans des scénarios d'agrégation de porteuses - Google Patents

Gestion efficace d'une puissance de transmission limitée dans des scénarios d'agrégation de porteuses Download PDF

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Publication number
WO2013067693A1
WO2013067693A1 PCT/CN2011/081990 CN2011081990W WO2013067693A1 WO 2013067693 A1 WO2013067693 A1 WO 2013067693A1 CN 2011081990 W CN2011081990 W CN 2011081990W WO 2013067693 A1 WO2013067693 A1 WO 2013067693A1
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WIPO (PCT)
Prior art keywords
information
transmission
time slot
acknowledgement information
receiving
Prior art date
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PCT/CN2011/081990
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English (en)
Inventor
Wei Bai
Erlin Zeng
Jing HAN
Chunyan Gao
Haiming Wang
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Renesas Mobile Corporation
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Priority to PCT/CN2011/081990 priority Critical patent/WO2013067693A1/fr
Publication of WO2013067693A1 publication Critical patent/WO2013067693A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
    • H04L1/0077—Cooperative coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), 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 signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting

Definitions

  • the present invention relates to dealing with restricted transmission power in carrier aggregation scenarios. More specifically, the present invention relates to methods and devices configured to adapt scheduled transmissions in order to decrease transmission power peaks in restricted transmission power situations.
  • CA carrier aggregation
  • CC component carriers
  • one CC serves as a primary carrier.
  • the primary cell is the cell, in which the UE performs the initial connection establishment procedure and in which essential control information are communicated. Once such initial connection is established, the UE may connect to further cells, known as secondary cells.
  • the secondary cells operate on secondary carriers which represent further frequency blocks. In a CA, one primary carrier and at least one secondary carrier are aggregated to form coexistent primary and secondary cells.
  • CA includes contiguous aggregation of adjacent carriers and non-contiguous aggregation, wherein the respective carriers are not adjacent to each other.
  • Such non-contiguous aggregation can be realized with component carriers of one frequency band (Intra-band non-contiguous aggregation) or with component carriers of two or more frequency bands (Inter-band noncontiguous aggregation).
  • LTE Long Term Evolution
  • a terminal as a user equipment i.e. a UE communicates with a base station like a evolved Node B, i.e. an eNodeB.
  • RRH radio remote head
  • the timing of uplink transmissions is to be controlled so that those
  • transmissions can be received from the eNodeB within a scheduled time slot. If a transmission arrives beyond the scheduled time slot, interference with transmissions of further UEs may appear. Since a distance between an UE and an eNodeB and other conditions affect signal propagation delays, the timing of said uplink transmissions have to be adjusted.
  • timing advance In order to compensate the propagation delay, a mechanism known as timing advance by which the uplink transmission timing at the UE is set earlier than the expected timing at the eNodeB, is deployed.
  • the timing advance procedure in LTE is divided into initial timing advance and timing advance updates.
  • the initial TA is used after the UE synchronizes its receiver to the downlink transmissions of the eNodeB and is set by means of the random access procedure: the eNodeB can estimate the uplink timing from the random access preamble and sends timing advance command including the time offset by which the UE should advance its transmission within a random access response (RAR) message. Since the UE is a mobile device, the propagation delay of transmissions may change from time to time.
  • timing advance updates are needed to update the uplink transmission timing to counteract changes in the arrival time at the eNodeB. It is performed by a closed-loop mechanism whereby the eNodeB measures the received up-Iink timing and issues timing advance update commands to the UE by means of medium access control (MAC) elements.
  • MAC medium access control
  • RACH Random Access Channel
  • RACH preamble is to be transmitted on a secondary carrier. It may be possible that an UE with a restricted power state is requested to transmit such RACH preamble using a secondary carrier in parallel with another transmission using the primary channel, e.g. on a Physical Uplink Control Channel (PUCCH), on a Physical Uplink Shared Channel (PUSCH) or a Sounding Reference Symbol (SRS).
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • SRS Sounding Reference Symbol
  • a transmission using the PUCCH on primary carrier is considered as example.
  • the power of a PUCCH transmission is calculated using the following formula:
  • the power of a RACH preamble transmission is calculated using the
  • PCMAX configured maximum UE output power in subframe i for serving cell
  • PO_PUCCH parameter composed of the sum of a parameter -3 ⁇ 4_NOMINAL_PUCCH provided by higher layers and a parameter P 0 _ UE PUCCH provided by higher layers
  • a limited power state of an UE may occur for various reasons. It means that the required transmission power for all transmissions at a time exceeds the available transmission power of the UE.
  • the required transmission power may be relatively high because the distance between the UE and the eNodeB is high and a high pathloss between the UE and the eNodeB occurs.
  • the UE has to perform the transmission with a high transmission power.
  • the UE may transmit on more than one component carriers, so that the required entire transmission power consists of the transmission power for each used component carrier.
  • HARQ Hybrid Automatic Repeat Request
  • UE For each received data packet, UE transmits acknowledgement information. If the packet is received correctly, UE transmits acknowledgement (ACK) information, whereby on receiving of incorrectly received packets negative acknowledgement (NACK) information is transmitted.
  • ACK/NACK information is transmitted on a Physical Uplink Control Channel (PUCCH) of a primary carrier.
  • PUCCH Physical Uplink Control Channel
  • the UE when the UE has to transmit a RACH preamble on a secondary carrier as a reaction to a timing advance control request and at the same time ACK/NACK information on PUCCH on the primary carrier, high transmission power is needed, which may exceed the maximum transmission power of a UE in a power limited state.
  • a possible solution may be to firstly ensure the transmission power of the PUCCH transmission and using the remaining transmission power for the RACH preamble, controlled on the UE side. However, if the needed minimum power at the eNodeB can not be achieved, the RACH preamble may be not detected or detected with errors.
  • a further solution may be controlled on the eNodeB side.
  • the eNodeB side has information on when RACH preambles are to be transmitted, since they are triggered.
  • eNodeB side is able to trigger only one of both transmissions at a time and thus to decide, which of both transmissions is to be performed by the UE. If eNodeB decides RACH preamble to be transmitted, it triggers RACH preamble and suspends downlink data transmissions on all configured carriers in order to prevent ACK/NAC information to be transmitted by the UE. If eNodeB decides PUCCH transmission to be transmitted, it maintains downlink data transmissions and avoids transmission of RACH preamble by not triggering RACH preamble.
  • the introduced eNodeB side solution may be implemented always
  • the introduced eNodeB side solution may be also implemented based on power information of UE side.
  • a decision is made whether UE is in power limited state or not, and a non-simultaneous transmission of RACH preamble and ACK/NACK on PUCCH is only initiated in case of a power limited state of the UE.
  • ENodeB can achieve power status information by use of power headroom reports (PHR) transmitted by the UE and, in case of activated secondary carrier, by considering the maximum power reduction ( PR) and the pathloss. Power Headroom Reports are triggered after secondary carrier is activated.
  • PHR power headroom reports
  • the eNodeB sends the uplink grant for a secondary carrier for example 8 subframes after secondary carrier is activated (n+8).
  • PHR is then successfully decoded based on the first transmission of the UE and the power limited information is then available for the eNodeB for example 12 subframes after secodary carrier activation (n+12).
  • a RACH trigger can be transmitted after that and the corresponding RACH preamble can be transmitted by the UE 6 subframes later (n+ 12+6).
  • a RACH preamble can be transmitted 18ms after secondary carrier is activated, which presents a very big delay for the necessary timing advance information.
  • implementation may not solve the problem of parallel transmission on PRACH and PUCCH.
  • RACH preamble on secondary carrier(s) and PUCCH transmission on primary carrier in case of a power limited state of a UE.
  • a device comprising communication means configured for communication, based on time slots, in a carrier aggregation mode aggregating a primary and at least one secondary carrier, control means configured to control transmission of acknowledgement information confirming receipt of payload data at the device and being transmitted in a first control channel using one of the carriers, and to control transmission of timing information indicating a transmission timing of the device in a second control channel using one of the carriers, and determination means configured to determine whether transmission of acknowledgement information and transmission of timing information are scheduled to take place within the same time slot, wherein said control means is configured to control transmission of said first channel and of said second channel to take place on different carriers, if it is determined by said determination means that transmission of acknowledgement information and transmission of timing information are not scheduled to take place within the same time slot, and to shift said transmission of acknowledgement information, if it is determined by said determination means that transmission of acknowledgement information and transmission of timing information are scheduled to take place within the same time slot.
  • a method comprising communicating, based on time slots, in a carrier aggregation mode aggregating a primary and at least one secondary carrier, controlling transmission of acknowledgement information confirming receipt of payload data at the device and being transmitted in a first control channel using one of the carriers, controlling transmission of timing information indicating a transmission timing of the device in a second control channel using one of the carriers, determining whether transmission of acknowledgement information and transmission of timing information are scheduled to take place within the same time slot, controlling transmission of said first channel and of said second channel to take place on different carriers, if it is determined in said determining step that transmission of acknowledgement information and transmission of timing information are not scheduled to take place within the same time slot, and shifting said transmission of acknowledgement information, if it is determined in said determining step that transmission of acknowledgement information and transmission of timing information are scheduled to take place within the same time slot.
  • a computer program product comprising computer-executable components which, when executed on a computer, are configured to communicate, based on time slots, in a carrier aggregation mode aggregating a primary and at least one secondary carrier, and to control transmission of acknowledgement information confirming receipt of payload data at the device and being transmitted in a first control channel using one of the carriers, to control transmission of timing information indicating a transmission timing of the device in a second control channel using one of the carriers, to determine whether transmission of acknowledgement information and transmission of timing information are scheduled to take place within the same time slot, to control transmission of said first channel and of said second channel to take place on different carriers, if it is determined by said determination means that transmission of acknowledgement information and transmission of timing information are not scheduled to take place within the same time slot, and to shift said transmission of acknowledgement information, when it is determined by said determination means that transmission of acknowledgement information and transmission of timing information are scheduled to take place within the same time slot.
  • a device comprising communication means configured for communication, based on time slots, in a carrier aggregation mode aggregating a primary and at least one secondary carrier, control means configured to control receiving of acknowledgement information indicating success of transmission of payload data transmitted by the device and being received in a first control channel using one of the carriers, and to control receiving of timing information indicating a propagation delay in a second control channel using one of the carriers, and estimation means configured to estimate whether receiving of acknowledgement information and receiving of timing information are scheduled to take place within the same time slot, wherein said control means is configured to control receiving of said first channel and of said second channel to take place on different carriers, if it is estimated by said estimation means that receiving of acknowledgement information and receiving of timing information are not scheduled to take place within the same time slot, and to receive shifted acknowledgement information, if it is estimated by said estimation means that receiving of acknowledgement information and receiving of timing information are scheduled to take place within the same time slot.
  • a method comprising communicating, based on time slots, in a carrier aggregation mode aggregating a primary and at least one secondary carrier, controlling receiving of acknowledgement information indicating success of transmission of payioad data transmitted by the device and being received in a first control channel using one of the carriers, controlling receiving of timing information indicating a propagation delay in a second control channel using one of the carriers, estimating whether receiving of acknowledgement information and receiving of timing information are scheduled to take place within the same time slot, controlling receiving of said first channel and of said second channel to take place on different carriers, if it is estimated by said estimation means that receiving of acknowledgement information and receiving of timing information are not scheduled to take place within the same time slot, and receiving shifted acknowledgement information, if it is estimated by said estimation means that receiving of acknowledgement information and receiving of timing information are scheduled to take place within the same time slot.
  • a computer program product comprising computer-executable components which, when executed on a computer, are configured to communicate, based on time siots, in a carrier aggregation mode aggregating a primary and at least one secondary carrier, and to control receiving of acknowledgement information indicating success of transmission of payload data transmitted by the device and being received in a first control channel using one of the carriers, to control receiving of timing information indicating a propagation delay in a second control channel using one of the carriers, to estimate whether receiving of acknowledgement information and receiving of timing information are scheduled to take place within the same time slot, to control receiving of said first channel and of said second channel to take place on different carriers, if it is estimated by said estimation means that receiving of acknowledgement information and receiving of timing information are not scheduled to take place within the same time slot, and to receive shifted acknowledgement information, if it is estimated by said estimation means that receiving of acknowledgement information and receiving of timing information are scheduled to take place within the same time slot.
  • the above computer program products may be embodied as a (volatile or non-volatile) computer-readable storage medium.
  • the methods, devices and computer program products described in this document are able to detect or to estimate whether two transmissions are scheduled to take place within a same time slot and using different carriers, which increases a requested transmission power to be performed by a user equipment UE.
  • the requested transmission power may not be performable by the UE.
  • one of the concurrently scheduled transmissions is shifted to another time slot or another carrier. By virtue thereof, a successful transmission of both scheduled transmissions can be assured. A restricted power situation can thus be handled effectively.
  • FIGURE 1 illustrates exemplary method steps carried out by
  • FIGURE 2 illustrates exemplary method steps carried out by
  • FIGURE 3 illustrates exemplary method steps carried out by
  • FIGURE 4 illustrates exemplary method steps carried out by and implemented at the evolved Node B side, eNodeB side, according to a first embodiment
  • FIGURE 5 illustrates a timing sequence according to a second embodiment. Description of exemplary embodiments
  • LTE system long term evolution
  • carrier aggregation is deployed.
  • LTE system long term evolution
  • Other systems differing from the LTE system can be adopted as long as they deploy carrier aggregation.
  • one carrier is a primary carrier and at least one carrier aggregated with a primary component carrier is referred to as secondary carrier.
  • carrier in a communication configured in carrier
  • a primary and at least one secondary carrier are present.
  • the communication is performed based on time slots and in channels. Those channels are divided in payload channels and control channels. Examples for payload channels are the physical downlink shared channel PDSCH for transmission of payload data in downlink direction and physical uplink shared channel PUSCH for transmission of payload data in uplink direction. Examples for control channels are the physical downlink control channel PDCCH for transmission of control information in downlink direction and physical uplink control channel PUCCH for transmission of control
  • a further example for a control channel is the physical random access channel PRACH, a normally contention-based channel used for initial access of a UE to the network.
  • PRACH a normally contention-based channel used for initial access of a UE to the network.
  • the transmissions on PRACH are aiso used for determination of the timing advance values for synchronized communication between UE and eNodeB.
  • PRACH is intended to be used for determination of multiple timing advance values on the at least one secondary carrier.
  • the PUCCH on primary carrier is mainly used to transmit the hybrid automatic repeat request HARQ feedback for downlink transmissions.
  • a transmission of the lower priority content of PUCCH can be waived, when successful transmission of PRACH timing information (preamble) to be used for estimation of propagation delay and PUCCH acknowledgement
  • ACK/NACK information is merged with the PRACH preamble via PRACH resource selection as described later.
  • the problem is solved by shifting the PUCCH transmission into a time slot subsequent to the intended time slot. Also in this way a concurrent transmission in both, primary and secondary carrier, can be avoided, since at first the PRACH preamble is transmitted on secondary carrier without transmission on primary carrier and in a subsequent time slot the PUCCH transmission including the ACK/NACK information is performed on primary carrier without transmission on secondary carrier. Thus, a necessary transmission power to be expended by the UE can be decreased.
  • Figure 1 illustrates exemplary method steps carried out by
  • acknowledgement data ACK/NACK and RACH preamble are intended to be transmitted within the same time slot.
  • acknowledgement data and RACH preamble are not intended to be transmitted within the same time slot (NO in step S2), the procedure advances to step S3.
  • acknowledgement data ACK/NACK is transmitted with said intended channel and timing configuration and said RACH preamble is also transmitted with the intended channel and timing configuration and the process ends in step S6.
  • step S2 In case acknowledgement data and RACH preamble are intended to be transmitted within the same time slot (YES in step S2), the procedure advances to step S4. In step S4, the channel and timing configuration of acknowledgement data ACK/NACK is adjusted, i.e. is shifted.
  • step S5 the RACH preamble is transmitted with the intended channel and timing configuration, whereas the acknowledgement data ACK/NACK is transmitted with the adjusted channel and timing configuration and the process ends in step S6.
  • Figure 2 illustrates exemplary sub method steps of the above mentioned shifting step S4 carried out by and implemented at an embodiment of the User Equipment, i.e. of the UE.
  • the shifting is implemented by shifting the acknowledgement data ACK/NACK into the concurrent PRACH preamble transmission and by encoding said
  • step S12 the UE receives information regarding a RACH preamble ID receiving modus and one or more RACH preamble IDs.
  • the number of received RACH preamble IDs depends on the number of acknowledgement data (ACK/NACK) elements and to the RACH preamble ID receiving modus.
  • the RACH preamble receiving modus may be a semi-statically configuration to use multiple preambles, whereby when configured, the UE has to receive a RACH preamble trigger including one RACH preamble ID, and then UE assumes that said included one RACH preamble ID and further s preamble IDs are reserved for said UE.
  • the RACH preamble receiving modus may further be receiving information on using multiple preambles via dedicated signaling, e.g. via downlink control information DCI received on physical downlink control channel PDCCH.
  • UE may receive one RACH preamble ID via DCI on PDCCH and following x RACH preamble IDs via consecutive random access preamble identifiers RAPID.
  • Such DCI signaling received by the UE may be implemented as follows.
  • the intended DCI format may be 1A, which is used for the compact scheduling of one PDSCH codeword in one cell and random access procedure initiated by a PDCCH order,
  • a possible bit string may be defined as follows:
  • Format 1A is used for random access procedure initiated by a PDCCH order only if format 1A CRC is scrambled with C-RNTI and all the remaining fields are set as follows:
  • UE may receive a pre-configuration including at least one indexed multiple RACH preamble ID combination and may further receive an index indicating one of said at least one multiple RACH preamble combination.
  • Such DCI signaling received by the UE may be implemented like the above mentioned DCI signaling with the difference, that the
  • a corresponding eNodeB estimates whether acknowledgement data ACK/NACK and RACH preamble are intended to be transmitted from the UE within the same time slot and determines an amount of acknowledgement data ACK/NACK bits to be transmitted by the UE, which is described more detailed later with reference to figure 4.
  • the eNodeB then allocates more than one RACH preamble IDs to the UE and communicates those RACH preamble IDs to the UE via the above described signaling, that is, by transmitting information regarding a RACH preamble ID receiving modus and one or more RACH preamble IDs to the UE.
  • each allocated RACH preamble ID corresponds to each of the expected possible acknowledgement data (ACK/NACK) states, respectively.
  • the process then advances to step S13.
  • step S13 UE assigns RACH preamble IDs based on the RACH preamble receiving modus, the received RACH preamble ID(s) and the acknowledgement data ACK/NACK to be transmitted. In this way, each of the RACH preamble IDs reserved for the UE is assigned to each of the possible acknowledgement data (ACK/NACK) states, respectively.
  • step S14 the UE determines which RACH preamble ID(s) of the reserved RACH preamble ID(s) is or are to be used for PRACH preamble transmission according to assignment of step 13 and to the actual acknowledgement data (ACK/NACK) states to be transmitted.
  • ACK/NACK actual acknowledgement data
  • step S15 indicates the transition to step S5 of figure 1, In this case in step S5 only RACH preambles with the determined RACH preamble IDs are transmitted.
  • the actual acknowledgement data ACK/NACK is therefore encoded with the preamble transmission on PRACH of the secondary carrier.
  • eNodeB Since the corresponding eNodeB applies the same assignment of RACH preamble IDs to acknowledgement data (ACK/NACK) states, eNodeB is able to decode acknowledgement data ACK/NACK from the preamble
  • FIG. 3 illustrates exemplary sub method steps of the above mentioned shifting step S4 carried out by and implemented at another embodiment of the User Equipment, i.e. of the UE.
  • the shifting is implemented by shifting the acknowledgement data ACK/NACK to a subsequent time slot.
  • the process starts in step S21 and advances to step S22.
  • step S22 a subsequent time slot is scheduled for the
  • acknowledgement data ACK/NACK to be transmitted.
  • the difference between the intended time slot and the newly scheduled time slot should be a predetermined positive integer, so that there is no simultaneous acknowledgement data ACK/NACK transmission on PUCCH of the primary carrier and PRACH preamble transmission on secondary carrier.
  • the positive integer should be minimized in order to minimize affecting the downlink data transmission.
  • frequency division duplex FDD mode a bidirectional communication mode in which transmission and reception takes place at the same time on different carrier frequencies, the positive integer may be 1.
  • time division duplex TDD mode a bidirectional communication mode in which transmission and reception takes place in different time slots but on the same carrier frequencies, the positive integer may be determined based on the next available transmission (uplink) time slot.
  • step S23 it is determined whether in the newly scheduled time slot a transmission of further acknowledgement data ACK/NACK is already intended.
  • step S24 In case a transmission of further acknowledgement data ACK/NACK is not intended for the newly scheduled time slot (NO in step S23), the process advances to step S24, wherein the acknowledgement data ACK/NACK is shifted to said newly scheduled time slot and then the process advances to step S28.
  • step S28 indicates the transition to step S5 of figure 1 with the newly scheduled time slot as the adjusted timing configuration.
  • step S23 the process advances to step S25.
  • step S25 the UE determines whether the acknowledgement data ACK/NACK (A/N seql) to be transmitted appended to the further acknowledgement data ACK/NACK (A/N seq2) already intended for the newly scheduled time slot would exceed the payload size of the PUCCH transmission in the newly scheduled time slot.
  • ACK/NACK sequences (A/N seql, A/N seq2) to be transmitted and the actually set format of the PUCCH transmission.
  • step S26 the acknowledgement data ACK/NACK (A/N seql) to be transmitted is appended to the further acknowledgement data ACK/NACK (A/N seq2) already intended for the newly scheduled time slot and the process advances to step S28,
  • step S28 indicates the transition to step S5 of figure 1 with the newly scheduled time slot as the adjusted timing configuration.
  • step S25 the process advances to step S27.
  • step S27 the acknowledgement data ACK/NACK (A/N seql) to be transmitted is bundled with the further acknowledgement data ACK/NACK (A/N seq2) already intended for the newly scheduled time slot by using a predefined bundling scheme in order to lower the payload size and the process advances to step S28,
  • the following step S28 indicates the transition to step S5 of figure 1 with the newly scheduled time slot of the bundled ACK/NACK sequences (A/N seql, A/N seq2) as the adjusted timing configuration.
  • a corresponding eNodeB is able to receive the acknowledgement data ACK/NACK (A/N seql) time-displaced from the expected time slot.
  • acknowledgement data ACK/NACK A/N seql
  • A/N seq2 acknowledgement data ACK/NACK
  • bundling A/N seql
  • acknowledgement data ACK/NACK (A/N seql) with the further
  • FIG. 4 illustrates exemplary method steps of a preparation of a RACH trigger carried out by and implemented at the evolved NodeB side, i.e. at the eNodeB side.
  • the process starts in step S31 and advances to step S32.
  • step S32 it is estimated whether acknowledgement data ACK/NACK on PUCCH on primary carrier and a preamble on PRACH of the secondary carrier are to be transmitted within the same time slot by the UE.
  • a RACH trigger is transmitted at a subframe n by the eNodeB
  • the corresponding RACH preamble might be transmitted at subframe n+6 by the UE.
  • a downlink data packet is transmitted at subframe n+2
  • the corresponding ACK/NACK information is transmitted 4 subframes after the data packet is received by the UE, so also
  • acknowledgement data ACK/NACK might be transmitted at subframe n+6 and a collision of both transmissions may occur.
  • step S32 In case the acknowledgement data ACK/NACK on PUCCH on primary carrier and the preamble on PRACH of the secondary carrier are not to be transmitted within the same time slot by the UE (NO in step S32), the process advances to step S38, which represents the end of said process.
  • step S33 the number of the expected possible acknowledgement data (ACK/NACK) states, and thus the number of the expected possible ACK/NACK bits are determined based on the transmitted downlink data packets. The determination is performed as follows. For example a downlink data packet transmitted by the eNodeB may cause two ACK/NACK bits, which have in total four states, which is also the number of RACH preamble IDs to be allocated to the UE. The process then advances to step S34.
  • step S34 the eNodeB allocates the determined number of RACH preamble IDs corresponding to the number of possible ACK/NACK bit states to the UE.
  • step S35 the eNodeB communicates those allocated preamble IDs to the UE by transmitting information regarding a RACH preamble ID receiving modus and one or more RACH preamble IDs to the UE.
  • the transmission of information regarding a RACH preamble ID receiving modus by the eNodeB may be a semi-statically configuration of the UE of using multiple preambles.
  • the eNodeB transmits a RACH trigger including one RACH preamble ID.
  • the transmission of information regarding a RACH preamble ID receiving modus may also be transmitting information on using multiple preambles via dedicated signaling, e.g. via downlink control information DCI transmitted on physical downlink control channel PDCCH.
  • eNodeB may transmit one RACH preamble ID via DCI on PDCCH and following x RACH preamble IDs via consecutive random access preamble identifiers RAPID.
  • eNodeB may transmit a pre-configuration including at least one indexed multiple RACH preamble ID combination and further transmits an index indicating one of said at least one multiple RACH preamble combination.
  • the respective DCI signalings transmitted by the eNodeB may be
  • each allocated RACH preamble ID corresponds to each of the expected possible acknowledgement data (ACK/NACK) states, respectively.
  • ACK/NACK expected possible acknowledgement data
  • step S37 the eNodeB extracts the acknowledgement data ACK/NACK from the preamble(s) transmitted on PRACH of the secondary carrier by the UE by means of the information which RACH preamble IDs are used in the received preamble(s). The process then advances to the end step S38.
  • Figure 5 illustrates the principle of shifting the acknowledgement data ACK/NACK to a subsequent time slot.
  • transmission of acknowledgement data ACK/NACK (A/N seq l) on PUCCH on primary carrier and transmission of PRACH preamble on secondary carrier collides with each other, when the respective
  • transmissions are intended to be performed within the same time slot.
  • acknowledgement data ACK/NACK (A/N seql) and PRACH preamble are to be transmitted in subframe n and the shifting operation shifts the acknowledgement data ACK/NACK (A/N seql) to subframe n+1 so that a collision of both intended transmissions can be avoided. It is further shown that in the time slot n+1 a further acknowledgement data ACK/NACK (A/N seq2) is intended to be transmitted.
  • the ACK/NACK sequences (A/N seql, A/N seq2) are appended or bundled in time slot n+1 according to the above described steps of appending or bundling said ACK/NACK sequences (A/N seql, A/N seq2).
  • the invention is implemented in an environment such as LTE system adopting carrier aggregation.
  • exemplary embodiments of the invention are represented by methods and/or correspondingly configured devices such as eNodeBs and/or UEs. More specifically, the invention generally relates to modem modules of such devices.
  • Other systems can benefit also from the principles presented herein as long as they have identical or similar properties like the carrier aggregation under LTE.
  • the invention enables handling transmissions of timing information and acknowledgement information in power limited situations. Said timing information are, e.g ., RACH preambles, said
  • acknowledgement information are, e.g., ACK/ ACK information. However, these information are not limited to said examples. Especially timing information transmissions may comprise all uplink (from UE side)
  • the invention may be applicable to solve situations where two transmissions of control information of any kind are scheduled to be performed within the same time slot in power limited situations.
  • Embodiments of the present invention may be implemented in software, hardware, application logic or a combination of software, hardware and application logic.
  • the software, application logic and/or hardware generally, but not exclusively, may reside on the devices' modem module.
  • the application logic, software or an instruction set is maintained on any one of various conventional computer-readable media.
  • a "computer-readable medium" may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer or smart phone, or user equipment.
  • the present invention relates in particular but without limitation to mobile communications, for example to environments under LTE, WCDMA, WIMAX and WLA and can advantageously be implemented in user equipments or smart phones, or personal computers connectable to such networks. That is, it can be implemented as/in chipsets to connected devices, and/or modems thereof.
  • the different functions discussed herein may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined.
  • the present invention proposes methods, devices and computer program products in relation to a communication module configured for
  • a transmission of acknowledgement data using one of the carriers and a transmission of timing information using one of the carriers are controlled. It is determined whether transmission of acknowledgement information and transmission of timing information are scheduled to take place within the same time slot. Transmission of said first and second channel is controlled to take place on different carriers, if it is determined that transmissions of acknowledgement information and timing information are not scheduled to take place within the same time slot. The transmission of acknowledgement data is shifted, if it is determined that transmissions of acknowledgement information and timing information are scheduled to take place within the same time slot.

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

Abstract

La présente invention concerne des procédés, des dispositifs et des produits programmes d'ordinateur en lien avec un module de communication conçu pour la communication, basée sur des créneaux temporels, en mode d'agrégation de porteuses agrégeant une porteuse primaire et au moins une porteuse secondaire. Une transmission de données d'accusé de réception à l'aide d'une des porteuses ainsi qu'une transmission d'informations de temporisation à l'aide d'une des porteuses sont commandées. Il est déterminé si la transmission des informations d'accusé de réception et la transmission des informations de temporisation doivent se dérouler dans le même créneau temporel. La transmission desdits premier et second canaux est commandée de manière à se dérouler sur des porteuses différentes s'il est déterminé que les transmissions des informations d'accusé de réception et des informations de temporisation ne doivent pas se dérouler dans le même créneau temporel. La transmission des données d'accusé de réception est décalée s'il est déterminé que les transmissions des informations d'accusé de réception et des informations de temporisation doivent se dérouler dans le même créneau temporel.
PCT/CN2011/081990 2011-11-09 2011-11-09 Gestion efficace d'une puissance de transmission limitée dans des scénarios d'agrégation de porteuses WO2013067693A1 (fr)

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WO2020065362A1 (fr) * 2018-09-27 2020-04-02 Lenovo (Singapore) Pte. Ltd. Transmission d'un canal physique partagé de liaison descendante après une perte de synchronisation de liaison montante
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US11166307B2 (en) 2018-09-27 2021-11-02 Lenovo (Singapore) Pte. Ltd. Transmitting a physical downlink shared channel after losing uplink synchronization
US11700615B2 (en) 2018-09-27 2023-07-11 Lenovo (Singapore) Pte. Ltd. Transmitting a physical downlink shared channel after losing uplink synchronization

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