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WO2020025032A1 - Partage de ressources de transmission de liaison montante - Google Patents

Partage de ressources de transmission de liaison montante Download PDF

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Publication number
WO2020025032A1
WO2020025032A1 PCT/CN2019/098947 CN2019098947W WO2020025032A1 WO 2020025032 A1 WO2020025032 A1 WO 2020025032A1 CN 2019098947 W CN2019098947 W CN 2019098947W WO 2020025032 A1 WO2020025032 A1 WO 2020025032A1
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Prior art keywords
resources
indication
ues
allocated
base station
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PCT/CN2019/098947
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English (en)
Inventor
Umer Salim
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JRD Communication Shenzhen Ltd
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JRD Communication Shenzhen Ltd
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Priority to CN201980042750.6A priority Critical patent/CN112335316B/zh
Publication of WO2020025032A1 publication Critical patent/WO2020025032A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • the following disclosure relates to sharing transmission resources in a cellular wireless network, and in particular to the sharing of uplink transmission resources in unlicensed spectrum.
  • Wireless communication systems such as the third-generation (3G) of mobile telephone standards and technology are well known.
  • 3G standards and technology have been developed by the Third Generation Partnership Project (3GPP) .
  • 3GPP Third Generation Partnership Project
  • the 3rd generation of wireless communications has generally been developed to support macro-cell mobile phone communications.
  • Communication systems and networks have developed towards a broadband and mobile system.
  • UE User Equipment
  • RAN Radio Access Network
  • CN Core Network
  • LTE Long Term Evolution
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • 5G or NR new radio
  • NR is proposed to utilise an Orthogonal Frequency Division Multiplexed (OFDM) physical transmission format.
  • OFDM Orthogonal Frequency Division Multiplexed
  • the NR protocols are intended to offer options for operating in unlicensed radio bands, to be known as NR-U.
  • NR-U When operating in an unlicensed radio band the gNB and UE must compete with other devices for physical medium access. For example, Wi-Fi, NR-U, and LAA may utilise the same physical medium resources.
  • a Listen Before Talk (LBT) protocol is proposed in which a gNB or UE monitors the available resources and only commences a transmission if there is no conflict with another device already utilising the resources.
  • LBT Listen Before Talk
  • the gNB or UE gains access to the resources for up to the Channel Occupancy Time (COT) provided there is no interruption of transmissions for more than a pre-defined interval (for example 16 ⁇ s) .
  • COT Channel Occupancy Time
  • Type 1 Two types of LBT process were standardized for LAA and have been proposed for UL transmissions in NR.
  • CCA Clear Channel Assessment
  • Type 2 Two types of LBT process were standardized for LAA and have been proposed for UL transmissions in NR.
  • CCA Clear Channel Assessment
  • CWS Contention Window Size
  • Type 2 a single short period is used to perform CCA whose duration has been fixed to be 25 micro seconds in 3GPP.
  • OCB Occupied Channel Bandwidth
  • NCB Nominal Channel Bandwidth
  • the NCB defines the widest band of frequencies, including guard bands, allocated to a channel, and the OCB defines the bandwidth containing a defined fraction (typically 99%) of a signal’s power. Often the OCB must be must be between 80%and 100%of the NCB.
  • ETSI EN 301.893 defines requirements in the EU for the 5GHz band.
  • FIG. 1 shows an interlace structure having ten interlaces. Data is transmitted over interlaced resource blocks which are multiplexed in frequency.
  • the basic resource allocation unit is considered to be one interlace, which is arranged to meet the OCB requirements discussed above thus allowing multiplexing of multiple UEs on different interlaces.
  • the interlace structure also allows the spread of energy to meet the PSD requirements and still have a sufficient energy transmission to ensure the signal is decodable at the receiver.
  • the interlace structure includes 10 RBs/interlaces for both 10 MHz and 20 MHz system bandwidths.
  • RBs within an interlace are equidistant, and Demodulation Reference Symbols (DMRS) in unlicensed spectrum utilise legacy generation sequence and symbol positions, while keeping the same frequency positions as PUSCH REs in the middle symbol of each slot.
  • DMRS Demodulation Reference Symbols
  • NR can utilise with both slot-based and non-slot-based scheduling.
  • slot-based system control messages PDCCH
  • non-slot-based scheduling PDCCH may be transmitted during the slot and with different periodicities.
  • an eNB To initiate transmission of UL data on the Physical Uplink Shared Channel (PUSCH) an eNB indicates to a UE the type of channel access procedure it should use in an uplink grant scheduling message.
  • the type 1 uplink channel access procedure is utilized to initialize an MCOT containing PUSCH transmission, while the type 2 uplink channel access procedure is utilized within the MCOT for resuming a suspended transmission or for changing the transmission direction from downlink to uplink.
  • SRS Sounding Reference Signal
  • FIG. 1 and 2 LBT processes operate successfully where devices are only permitted to commence transmission at a single symbol, but do not permit different devices to start transmission at different symbols in an efficient manner.
  • Figure 2 shows allocation of two UEs, UE1 and UE2, to interlaces 0 and 2. This figure shows an interlace as a scheduling entity even though in reality each single interlace may comprise multiple distributed resource blocks.
  • UE1 conventional LBT can identify channel availability and commence transmission at the scheduled time.
  • UE2 is scheduled to commence transmission part-way through the slot, after UE1 has already started transmission. Since UE1 and UE2 are associated with the same gNB it can in theory commence transmission even though UE1 is already transmitting.
  • UE2 will detect the transmission power of UE1 and hence cannot commence transmission as the medium has been seized by UE1, even though UE2 has been scheduled to use a different interlace.
  • Figure 3 shows the same resource allocation, but here the relevant gNB lost access to the transmission medium and UE1 did not start transmitting at the start of the slot.
  • a Wi-Fi device seized access and started transmitting across the bandwidth allocated to UE1 and UE2.
  • the gNB may have lost access due to the Wi-Fi device seizing the channel during the switching time between DL and UL, the Wi-Fi device may have seized the channel during UE1’s LBT interval, or UE1 might have missed its UL grant and hence did not start transmitting.
  • UE2 will detect transmission power and so is unable to commence transmission even though in Figure 2 it is entitled to do so if both UE1 and UE2 are scheduled by the same gNB. Even if UE2 can identify that the detected power during LBT is a transmission on a particular interlace which does not conflict with its allocated interlace it still cannot transmit as it is not aware if the relevant device is part of the same group as UE2 and hence whether it is permitted to commence transmissions.
  • a method of resource sharing in a cellular communication system comprising the steps of transmitting an indication from the base station to a UE indicating resources available for uplink (UL) transmissions from the UE to the base station; and transmitting an indication from the base station to the UE of UL transmission resources allocated to other UEs associated with the base station in a period prior to the start of the resources indicated as available to the UE for UL transmissions.
  • UL uplink
  • a method of resource sharing in a cellular communication system comprising the steps of receiving an indication from a base station indicating resources available for uplink (UL) transmissions from the UE to the base station; and receiving an indication from the base station of UL transmission resources allocated to other UEs associated with the base station in a period prior to the start of the resources indicated as available to the UE for UL transmissions.
  • UL uplink
  • the resources may be located in an unlicensed band.
  • the resources may comprise a plurality of interlaces.
  • the indication of UL transmission resources allocated to other UEs may comprise a bitmap field.
  • Each bit of the bitmap may correspond to a group of physical resources.
  • the groups of physical resources may be interlaces.
  • the indication of UL transmission resources allocated to other UEs may be transmitted in a group-common DCI message.
  • the group-common DCI message may be a DCI 1-C format DCI message.
  • the indication of UL transmission resources allocated to other UEs may be transmitted in a UE-specific DCI message.
  • the UE-specific DCI message may be a DCI message which also includes the indication of resources available for transmissions from the UE to the base station.
  • the indication of resources available for transmission from the UE to the base station may comprise an indication of a subsequent message indicating the UL transmission resources allocated to other UEs.
  • the UL transmission resources allocated to other UEs may include resources allocated for configured-grant-based transmissions.
  • the UL transmission resources allocated to other UEs may include resources allocated to UEs associated with the base station but operating in a different beam to the UE.
  • the resource indication may be the resource occupation for the symbol preceding the first symbol of the UE’s allocated resources.
  • the indication of UL transmission resources allocated to other UEs may include the utilisation at a plurality of different times.
  • the period may be a Listen Before Talk (LBT) period of the UE.
  • LBT Listen Before Talk
  • the indication of UL transmission resources allocated to other UEs may be received in a group-common DCI message.
  • the group-common DCI message may be a DCI 1-C format DCI message.
  • the indication of UL transmission resources allocated to other UEs may be received in a UE-specific DCI message.
  • the UE-specific DCI message may be a DCI message which also includes the indication of resources available for transmissions from the UE to the base station.
  • the method may further comprise performing a LBT process to identify utilised resources in the LBT period, wherein the UL only transmits in its allocated UL transmission resources if the utilised resources are the same as the resources indicated as allocated to other UEs.
  • the method may further comprise the step of performing a LBT process to identify utilised resources in the LBT period, wherein the UL only transmits in its allocated UL transmission resources if the utilised resources are the same as, or a subset of, the resources indicated as allocated to other UEs.
  • the method may further comprise the step of performing a LBT process to identify utilised resources in the LBT period, wherein the UL only transmits in its allocated UL transmission resources if the utilised resources are different to the resources indicated as allocated to other UEs by less than a predefined threshold.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • Figure 1 shows a set of interlaces
  • Figure 2 shows scheduling of two UEs on different interlaces
  • Figure 3 shows an example of a competing transmitter seizing the transmission medium
  • FIG. 4 shows an LBT process
  • Figures 5 to 8 show scheduling of UEs on resources.
  • the following disclosure provides an improved LBT mechanism which seeks to enable more efficient multiplexing of UE UL transmissions.
  • the unlicensed spectrum regulations specify that only one device, or group of devices, is permitted to access the spectrum at a time.
  • a cell of a cellular system and all UEs associated with that cell are defined as a group.
  • UE1 and UE2 are associated with the same cell and hence it is permissible for UE2 to commence transmissions, even though UE1 is already transmitting in the spectrum.
  • a base station notifies UEs of the spectrum allocation of other UEs in the same cell.
  • the UEs themselves are configured such that, when performing an LBT process, they can identify which frequency resources are being utilised.
  • the UE can thus correlate the base station’s indication of spectrum utilisation with the measurement data to determine if the power detected in the LBT process is from other UEs of the same cell, or not. If detected power is related to UEs scheduled by the same cell the UE is free to transmit as scheduled as it is part of the same group.
  • UE2 would receive an indication that a UE is scheduled on interlace 0.
  • FIG. 4 shows a flowchart of an enhanced LBT procedure.
  • a base station transmits a scheduling message to a UE indicating DL and/or UL scheduling for a slot.
  • the base station transmits an indication of resources allocated to other UEs in the relevant slot.
  • the UE performs an LBT process, prior to commencing UL transmission as indicated by the scheduling message.
  • the UE compares the spectrum utilisation identified at step 402 with the indication of resources received at step 401. If the indicated resources and utilised spectrum correlate (for example as set out below) the UE transmits as scheduled at step 404. In contrast, if the indicated resources and utilised spectrum do not correlate (for example as set out below) the UE does not transmit 405 as scheduled as it appears another device has seized the spectrum.
  • the resource indication could be on a physical resource block (PRB) group basis where the group size can be adapted.
  • PRB physical resource block
  • Rel-14 eLAA the interlace based transmission has been adapted for UL transmission design where each interlace is composed of interleaved sets of PRBs, as described hereinbefore.
  • an interlace is the basic unit of resource allocation, and each UE can be assigned one or more interlaces.
  • Rel-14 eLAA defines 10 RB/interlace for UL, giving 5 and 10 interlaces for 10MHz and 20MHz spectrum respectively.
  • the resource indication should thus indicate to the UE which interlaces are occupied by other UEs associated with the same cell.
  • Such an indication may be provided utilising a bitmap in which each bit represents the occupancy or allocation status of a respective interlace (or other resource block as appropriate) .
  • a bitmap is an efficient method of encoding the required information and thus may reduce the signalling overhead. If the relevant protocol uses a different interlace design or different grouping of PRBs which can be allocated to the users for UL transmission, the resource occupancy bitmap should correspond to the grouping of PRBs which is adopted for resource allocation.
  • Figure 5 shows an example in which two UEs, UE0 &UE1, are scheduled on different interlaces at different times in a slot. In this example there are 5 interlaces available.
  • UE0 is scheduled to transmit two transport blocks in two slots (slot #1 and slot #2)
  • UE1 is scheduled to transmit one transport block in slot 2.
  • UE0 is scheduled to transmit one transport block across both slot #1 and slot #1
  • UE2 is scheduled as for Figure 5 (a) .
  • UE1 has the same challenge in deciding whether it can transmit or not.
  • UE1 and UE0 are scheduled in slot 2 but UE1 upon doing LBT will detect the energy of UE0 from slot 1.
  • One strategy to overcome the issue in Figure 5 (a) could be to introduce a gap in the transmission of UE0, e.g., by base station scheduling UE0 to stop a certain time before the end of slot 1 or by scheduling both UE0 and UE1 start their transmissions a little later after the slot 2 starts. This may provide a short interval where no transmission is scheduled but this is resource inefficient. There is further risk that some other devices occupy the unlicensed resource in this gap. This strategy of enforcing gaps between the scheduling intervals would not work in Figure 5 (b) as UE1 starts in slot 2 in the middle of the transmission of UE 0. When performing LBT UE1 will therefore detect the power of UE0.
  • UE1 can correlate the detected resource occupancy and power to an indication of scheduling received from the base station, UE1 can identify that it is permitted to transmit.
  • the base station thus transmits an indication to UE1 of the resource allocation in the relevant slot (in which UE1 is performing its LBT process) .
  • the message “01000” may be transmitted to UE1 indicating that when it is scheduled to perform LBT prior to starting its transmissions, only interlace 1 is scheduled to be occupied. If the estimated resource utilisation matches this indication, then UE1 can commence transmissions on interlace 3.
  • UE1 senses a different resource utilisation it can be determined that the sensed power is from a different source and that hence it is not permitted to transmit. For example, a different device may have seized the spectrum before UE0 commenced its scheduled transmissions and hence it could not transmit as scheduled. In an example, a Wi-Fi device may be transmitting across all interlaces.
  • the sensed resource utilisation would, in the described message format, be “11111” .
  • the sensed resource utilisation would be “00000” .
  • the sensed utilisation does not match the indicated utilisation, but the UE is free to transmit as the spectrum is available according to the LBT measurement.
  • This can be phrased more generally by stating that a UE can transmit if the sensed resource utilisation is a subset of the indicated utilisation.
  • Such a rule also allows for correct transmission by a UE according to the indicated utilisation if at least one of the other UEs scheduled by the same base station misses transmission.
  • the UE may perform a short conventional LBT (for example, a Type 2 LBT in the 3GPP standards) before starting transmissions to verify the spectrum is available. If the sensing duration to estimate the resource occupancy are no less than the duration of conventional LBT and the energy detected has been found to be less than the threshold of the conventional LBT , the UE can directly transmit without performing an additional conventional LBT.
  • a short conventional LBT for example, a Type 2 LBT in the 3GPP standards
  • a refinement of the above transmission rule is that a UE is allowed to transmit only if the following two conditions are satisfied: (1) the sensed resource occupancy is same or a subset of the indicated resource occupancy, (2) and the discrepancy (for example Exclusive-OR operation of indicated and sensed resource occupancy indications) is smaller than a certain number of resources/interlaces.
  • the threshold can be preconfigured for all UEs according to specifications, or transmitted to each UE by the network, for example via RRC signalling. If zero discrepancy is allowed, then the sensed resource utilisation must be a perfect match to the indicated resource utilisation. If the allowed discrepancy is equal to the number of interlaces, then the combined two conditions allow the UE to transmit if the sensed resource utilisation is any subset of the indicated resource utilisation.
  • transmission may be allowed if the discrepancy between the sensed and indicated resource utilisation is below a predefined threshold. That is, if the sensed usage is larger or smaller than the indicated usage by up to a predetermined amount (which may be different for larger or smaller discrepancies) .
  • a predefined threshold if the sensed usage is larger or smaller than the indicated usage by up to a predetermined amount (which may be different for larger or smaller discrepancies) .
  • transmission may be permitted provided the discrepancy is less than the predetermined amount.
  • a further condition may be added such that if the UE’s assigned resource is sensed as being utilised transmission is not permitted, thus avoiding a direct conflict for use of resources.
  • the proposed NR radio formats include a range of sub-carrier configurations. For example, a 20 MHz spectrum may give 10 interlaces for 15KHz sub-carrier spacing (SCS) but only 10 and 5 interlaces for 10 RB/interlace if SCS is scaled to 30KHz and 60KHz respectively. There could yet exist further interlace designs with different footprints in time and frequency.
  • the proposed resource utilisation indications may require different formats to accommodate the varying number of interlaces available. For example, a bitmap corresponding to the configuration with the largest number of interlaces may be utilised, and the information for other SCS based interlaces can be derived from this bitmap. Another possibility can be to design a bitmap for each specific interlace design only.
  • Figure 6 shows further examples of resource allocation and utilisation. In particular, examples in which utilisation changes through a slot are shown.
  • UE0 starts transmission at symbol #7 of a first slot (n) .
  • Figure 6 (c) shows an example of UE0 being allocated an entire slot, but UE1 is allocated a mini-slot, and
  • Figure 6 (d) shows an example where both UEs are allocated mini/sub-slot resources.
  • UE1 is scheduled to start transmission when at least one other UE (UE0) is transmitting and hence conventional LBT mechanisms will not allow UE1 if it has the right to transmit or not, and hence requires knowledge that those transmissions are related to the same device group as UE1 in order to be able to commence transmission.
  • a signalling mechanism is required to indicate resource utilisation to UEs such that they can assess their ability to transmit. Any UE related to a cell utilising the unlicensed resources, and configured to the current disclosure, may benefit from the resource utilisation indication.
  • Group common signalling may be utilised to transmit resource utilisation to UEs.
  • Each UE which is scheduled for transmission, or is in an RRC active state, may be placed in a group by allocating a RNTI.
  • Control resources are allocated which can carry common resource utilisation signalling to the UEs with the assigned RNTI.
  • Such a system allows sharing of control resources which may be attractive if there are a large number of UEs scheduling for UL transmission with different start symbols.
  • the resource utilisation may be transmitted to UEs utilising a common DCI message.
  • the common DCI 1-C format may be utilised for which a known fixed RNTI is used, see Section 5.3.3.1.4 of 3GPP TS36.212-f10.
  • An additional field may be added to the DCI 1-C format to carry the utilisation information. For example, a bitmap field as described above may be utilised.
  • This DCI provides the sub-frame configuration for LAA.
  • Resource utilisation information may be provided with a trigger as is the current two-stage DCI trigger mechanism for PUSCH on LAA in LTE.
  • the base station sends a first DCI with PUSCH trigger A (using one of the DCI formats 0A/0B/4A/4B) which schedules the resources for the UE with relative timing and defines a duration within which the scheduling is valid.
  • the UE then waits to receive the 2 nd trigger, named as PUSCH trigger B, which provides the UL duration and offset and hence lets the UE compute its precise scheduling timing information.
  • This PUSCH trigger B is sent in enhanced LAA using the DCI format 1C with a common RNTI.
  • PUSCH trigger B is utilised to activate a PUSCH transmission by indicating UL duration and offset for a transmission which has been pre-scheduled to the user in a user-specific DCI with a PUSCH trigger A.
  • the proposed resource occupancy indication can be embedded in this two stage PUSCH control mechanism by adding the resource occupancy information in the 2 nd DCI which serves as 2 nd trigger and provides the information to compute the precise timing information to the UE. In this way, the resource utilisation indication, although sent in the form of common signalling, can target the specific users.
  • DCI 1-C signalling is common (or group-common) signalling
  • the use of a trigger helps to target the information to a specific UE.
  • the information is sent such that it is decodable by the group, but the UE to which the information is relevant is able to use the information.
  • DCI 1-C style common signalling can be efficient.
  • the use of group DCI signalling may be less effective depending on the scheduling scenarios and start times of the UEs.
  • group signalling may be efficient.
  • the scheme may have limitations if the UEs are scheduled to start on a larger number of different symbols since the information relevant to each different start symbol is different.
  • Figure 7 shows an example in which 4 UEs are scheduled on 5 interlaces during a slot.
  • UE0 is scheduled to occupy interlace 1 for the whole slot
  • UE1 and UE2 are both scheduled on interlace 3 but in different symbols.
  • UE 4 is scheduled to transmit on interlace 4, starting at symbol 7.
  • Resource utilisation bitmaps for each symbol are shown along the bottom of the figure.
  • the resource utilisation information is transmitted at the start of the slot it may indicate that only interlace 1 is utilised (01000) , and it may be assumed this is valid for the duration of the slot. This information is valid for UE1 and UE4 and will enable those UEs to take a correct decision to start transmission if they detect that only interlace 1 is utilised, assuming sensing is performed immediately prior to their start symbol. A longer sensing period may cause UE4 to detect UE1’s transmission and may be an issue in deciding its transmission right. However, the information is less useful for UE2, since the interlace utilisation immediately prior to UE2 commencing transmission (01001) is different to that at the start of the slot (01000) .
  • a time indication may be included. For example, two bits may be utilised for each interlace, with a first bit indicating utilisation in the first half of the slot, and a second bit indicating utilisation in the second half of the slot.
  • the bitmap for the first half slot (relevant for UE1 and UE4) would be 01000, and for the second half of the slot would be 01001 (relevant for UE2) .
  • Additional bits (up to, for example, one bit per symbol) improves the accuracy of the information and hence its relevance, but also increases the control overhead.
  • Each UE only requires the resource utilisation prior to its allocated start symbol, and hence utilising additional bits in this way transmits redundant information to each UE (in the 2 bits per slot example, one bit is redundant for each UE as the UE’s start symbol is either in the first or second half of the slot, meaning the bit for the other half is not required) .
  • resource occupancy may still be different within the half-slot in certain cases and may need resource indication for a further smaller granularity.
  • UE-specific signalling of resource utilisation can be performed utilising user-specific DCI messages, for example the DCI which schedules the UL transmission can also include resource utilisation information for the cell. For example, an additional field may be added to the DCI message to indicate the resource utilisation.
  • DCI formats 0A, 0B, 4A, and 4B are utilised for resource scheduling and may be modified to include a resource utilisation indication.
  • the resource utilisation may indicate the resource utilisation prior to the UE’s scheduled start symbol. For example, if the UE is scheduled to start its UL transmission in symbol N, the resource utilisation (e.g. a bitmap as described above) may be provided in relation to symbol N-1 where the UE will perform its LBT function.
  • LBT sensing may be performed over more than one symbol prior to transmission starting, and hence the resource indication may be provided over a longer period, for example N-2 symbols.
  • the relevant indication point can be defined according to the specific configuration, and the resource utilisation may be indicated for the most relevant symbol N-x, where x is an integer defining how many symbols in advance of the start symbol the utilisation information is relevant for.
  • x may be indicated to the UE, or preconfigured.
  • Figure 8 shows an example of UE-specific resource utilisation signalling for the same example shown in Figure 7.
  • the network transmits a utilisation indication of 01000 for UE1 and UE4.
  • the indication transmitted to UE2 is 01001 since UE4 has started transmitting prior to UE2’s start symbol.
  • Each UE thus receives a true indication of resource utilisation at the time of performing an LBT function and can hence perform an accurate comparison when determining whether to start transmission.
  • the resource utilisation information is not an essential element of every DCI message, even for UEs operating in NR-U.
  • the field (s) containing the information can there be declared optional and included by the base station only when they are required or are considered useful to a UE.
  • UEs may be configured to blind-decode two DCI formats, one with and one without utilisation information and to use the information as required if it is included. Blind decoding adds some processing overhead but enables the reduction of control signalling overheads.
  • each UE may be configured to expect, or not expect, utilisation information in its DCI messages.
  • the network may use RRC signalling to configure UEs about decoding the larger DCI with resource indication.
  • a further signalling protocol includes a flag in a DCI message scheduling an UL transmission.
  • the flag indicates if a second DCI message will be transmitted which includes resource utilisation information.
  • This protocol reduces the overhead in the first DCI which is always transmitted to a single bit and enables UE-specific utilisation information to be transmitted in a second DCI message only when required or useful.
  • the second DCI message could be directed to a group of UEs having the same start symbol, or other grouping as may be useful.
  • a UE may sense transmissions from UE’s in neighbouring beams due to physical constraints and the beam-forming capability of UEs.
  • a UE may thus detect a mismatch between the indication of resources from the base station and the sensed resource utilisation, even though the UE is free to transmit within its beam area.
  • the base station including resource utilisation from adjacent beams in the information transmitted to a UE.
  • the base station has full scheduling information for all beams, and awareness of the location of UEs, and can thus make a reasonable estimate of the signals each UE may detect.
  • the indicated resource utilisation may thus include resources utilised by different beams but which are likely to be detected by the UE.
  • the base station For grant-based UL transmissions, as discussed above, the base station is aware of all scheduled transmissions and can hence provide accurate indications of scheduled resource utilisation. However, in the case of grant-free transmission, semi-persistent scheduling or configured-grant a base station configures periodic resources as available to a UE and the UE decides whether to use those resources depending on its transmissions needs. In such cases the base station is not aware of which resources will actually be utilised for UL in each symbol, but only that certain resources may be utilised. The above systems would allow an indication of resources that might be used in each symbol, but that indication may not be accurate depending on the choice of each UE to use, or not use, its allocated resources.
  • a base station may indicate resource utilisation to a configured-grant-based UE using a group-common DCI which is decodable by every user configured for configured-grant transmission.
  • the indication whether they need this resource occupancy indication or not may be the part of the configured-grant based setup.
  • the base station is not aware whether each UE will actually use an allocated resource, and hence cannot give a definitive indication. However, the base station is aware of which resources might be utilised and this can be indicated to each UE using the techniques described above. If resources have been allocated to a UE, they are indicated as utilised in the utilisation indication.
  • the UEs may be configured to apply the subset rule discussed above, such that if the sensed resources are a subset of the indicated resources the UE is allowed to transmit. Sensing a subset of the indicated resources shows that some of the allocated resources have not been used and the discrepancy between sensed and indicated resources should not prevent transmission.
  • the indication field may include three options –free, busy, or configured for configured-grant-based transmissions. This provides a more precise indication to the UEs of the resource configuration and hence allows a more effective comparison and decision.
  • BWP bandwidth part
  • a base station can configure multiple portions of the carrier bandwidth to the UE and one of these can be activated by the base station. This activation can be through RRC signalling or DCI based signalling.
  • BWP operation facilitates the UE operation where carrier bandwidths are large. This is also the case in unlicensed bands where very large bandwidths are available. If a UE has been configured to use BWP operation in the unlicensed band, the resource occupancy indication signalling is provided in relation to the active BWP for the relevant UE.
  • any of the devices or apparatus that form part of the network may include at least a processor, a storage unit and a communications interface, wherein the processor unit, storage unit, and communications interface are configured to perform the method of any aspect of the present invention. Further options and choices are described below.
  • the signal processing functionality of the embodiments of the invention especially the gNB and the UE may be achieved using computing systems or architectures known to those who are skilled in the relevant art.
  • Computing systems such as, a desktop, laptop or notebook computer, hand-held computing device (PDA, cell phone, palmtop, etc. ) , mainframe, server, client, or any other type of special or general purpose computing device as may be desirable or appropriate for a given application or environment can be used.
  • the computing system can include one or more processors which can be implemented using a general or special-purpose processing engine such as, for example, a microprocessor, microcontroller or other control module.
  • the computing system can also include a main memory, such as random access memory (RAM) or other dynamic memory, for storing information and instructions to be executed by a processor. Such a main memory also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor.
  • the computing system may likewise include a read only memory (ROM) or other static storage device for storing static information and instructions for a processor.
  • ROM read only memory
  • the computing system may also include an information storage system which may include, for example, a media drive and a removable storage interface.
  • the media drive may include a drive or other mechanism to support fixed or removable storage media, such as a hard disk drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a compact disc (CD) or digital video drive (DVD) read or write drive (R or RW) , or other removable or fixed media drive.
  • Storage media may include, for example, a hard disk, floppy disk, magnetic tape, optical disk, CD or DVD, or other fixed or removable medium that is read by and written to by media drive.
  • the storage media may include a computer-readable storage medium having particular computer software or data stored therein.
  • an information storage system may include other similar components for allowing computer programs or other instructions or data to be loaded into the computing system.
  • Such components may include, for example, a removable storage unit and an interface , such as a program cartridge and cartridge interface, a removable memory (for example, a flash memory or other removable memory module) and memory slot, and other removable storage units and interfaces that allow software and data to be transferred from the removable storage unit to computing system.
  • the computing system can also include a communications interface.
  • a communications interface can be used to allow software and data to be transferred between a computing system and external devices.
  • Examples of communications interfaces can include a modem, a network interface (such as an Ethernet or other NIC card) , a communications port (such as for example, a universal serial bus (USB) port) , a PCMCIA slot and card, etc.
  • Software and data transferred via a communications interface are in the form of signals which can be electronic, electromagnetic, and optical or other signals capable of being received by a communications interface medium.
  • computer program product may be used generally to refer to tangible media such as, for example, a memory, storage device, or storage unit.
  • These and other forms of computer-readable media may store one or more instructions for use by the processor comprising the computer system to cause the processor to perform specified operations.
  • Such instructions generally 45 referred to as ‘computer program code’ (which may be grouped in the form of computer programs or other groupings) , when executed, enable the computing system to perform functions of embodiments of the present invention.
  • the code may directly cause a processor to perform specified operations, be compiled to do so, and/or be combined with other software, hardware, and/or firmware elements (e.g., libraries for performing standard functions) to do so.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • the software may be stored in a computer-readable medium and loaded into computing system using, for example, removable storage drive.
  • a control module (in this example, software instructions or executable computer program code) , when executed by the processor in the computer system, causes a processor to perform the functions of the invention as described herein.
  • inventive concept can be applied to any circuit for performing signal processing functionality within a network element. It is further envisaged that, for example, a semiconductor manufacturer may employ the inventive concept in a design of a stand-alone device, such as a microcontroller of a digital signal processor (DSP) , or application-specific integrated circuit (ASIC) and/or any other sub-system element.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • aspects of the invention may be implemented in any suitable form including hardware, software, firmware or any combination of these.
  • the invention may optionally be implemented, at least partly, as computer software running on one or more data processors and/or digital signal processors or configurable module components such as FPGA devices.
  • an embodiment of the invention may be physically, functionally and logically implemented in any suitable way. Indeed, the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units.
  • the present invention has been described in connection with some embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the scope of the present invention is limited only by the accompanying claims. Additionally, although a feature may appear to be described in connection with particular embodiments, one skilled in the art would recognise that various features of the described embodiments may be combined in accordance with the invention. In the claims, the term ‘comprising’ does not exclude the presence of other elements or steps.

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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 des procédés pour fournir des informations d'utilisation de ressources à un UE afin de faciliter un processus d'écoute avant transmission (LBT). Une station de base transmet à un UE une indication de ressources attribuées à d'autres UE associés à la même station de base. Lorsqu'un UE effectue un processus LBT, il compare l'utilisation détectée à celle indiquée par la station de base, afin de confirmer si l'UE est autorisé à transmettre.
PCT/CN2019/098947 2018-08-02 2019-08-01 Partage de ressources de transmission de liaison montante Ceased WO2020025032A1 (fr)

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GB1812600.3A GB2576034B (en) 2018-08-02 2018-08-02 Uplink transmission resource sharing

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GB201812600D0 (en) 2018-09-19
CN112335316A (zh) 2021-02-05

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