WO2018082527A1 - Systèmes et procédés d'attribution de ressources sans fil - Google Patents

Systèmes et procédés d'attribution de ressources sans fil Download PDF

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Publication number
WO2018082527A1
WO2018082527A1 PCT/CN2017/108397 CN2017108397W WO2018082527A1 WO 2018082527 A1 WO2018082527 A1 WO 2018082527A1 CN 2017108397 W CN2017108397 W CN 2017108397W WO 2018082527 A1 WO2018082527 A1 WO 2018082527A1
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resource blocks
allocation
indication
wireless
allocated
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PCT/CN2017/108397
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English (en)
Inventor
Roy Ron
Ioannis Xirouchakis
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Huizhou Tcl Mobile Communication Co., Ltd
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Priority to CN201780068003.0A priority Critical patent/CN109906654B/zh
Publication of WO2018082527A1 publication Critical patent/WO2018082527A1/fr

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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/0012—Hopping in multicarrier systems
    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0041—Frequency-non-contiguous
    • 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
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • the present disclosure relates to allocation of wireless resources to wireless communication devices.
  • LTE Long-Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • MTC Machine Type Communications
  • LTE Release 13 support MTC devices with a channel bandwidth of up to 1.4MHz.
  • An MTC device is allocated a contiguous groupof up to six Physical Resource Blocks (PRB) within a narrowband.
  • PRB Physical Resource Blocks
  • a device receives a resource allocationwhich indicates a resource block assignment (RBA) comprisinga narrowband index and 5 bits indicating the resource allocation within the narrowband.
  • RBA resource block assignment
  • a method of allocating wireless resources for a wirelessdevice comprising, at a wireless node: transmitting to the wireless device an allocation indication of wireless resourcesallocated to that wirelessdevice, wherein a bandwidth of the wireless node comprises a plurality of resource blocks in the frequency domain, the total bandwidth comprising a plurality of sets of resource blocks, each set of resource blocks comprising an integer number n of consecutive resource blocks in the frequency domain, and wherein the allocation indication comprises: an indication of allocated resource blocks within one of the sets of resource blocks; an indication of the allocated set of resource blocks within the node bandwidth.
  • the indication of the allocated set may be an indication of an offset, in terms of a number of sets, from a reference set.
  • the indication of the allocated set may be an indication of an offset, in terms of a number of sets, from a first set.
  • a maximum size of each of the sets may be 24 or 25 resource blocks.
  • the allocation indication may comprise an indication of the allocation type, there beingtwo allocation types: a localized allocation of contiguous resource blocks within the allocated set of resource blocks; a distributed allocation of resource blocks within the allocated set of resource blocks.
  • the indication of allocated resource blocks within the allocated set may be a resource allocation Type 2 as defined in 3GPP TS 36.213.
  • the allocation indication may indicate whether frequency hopping is enabled between different sets of resource blocks.
  • the sets of resourceblocks may be of equal size.
  • a size of the set may be variable based on the total bandwidth of the wireless node.
  • the node bandwidth may be one of: 10 MHz, 15 MHz, 20 MHz and the number of sets of resource blocks is two, three, fourrespectively.
  • the allocation indication may comprise: a 1-bit indication of the allocation type; a 1-bit indication of whether frequency hopping is enabled between different sets of resource blocks; a multi-bit indication of allocated resource blocks within the allocated set; at least a one bit indication of an offset, in terms of a number of sets, from a reference set.
  • the multi-bit indication of allocated resource blocks may be a maximum of 7 bits.
  • a method of allocating wireless resources for wireless devices comprising, at a wirelessdevice: receiving at the wireless device an allocation indication of wireless resources allocated to that wireless device, wherein a total bandwidth of a wireless node serving the wireless device comprises a plurality of resource blocks in the frequency domain, the total bandwidth comprising a plurality of sets of resource blocks, each set of resource blockscomprising an integer number n of consecutive resource blocks in the frequency domain, and wherein the allocation indication comprises: an indication of allocated resource blocks within one of the sets of resource blocks; an indication of the allocated set of resource blocks within the node bandwidth.
  • the allocation may be an allocation of downlink channel resources.
  • the allocation may be an allocation of uplink channel resources.
  • the wireless device may be a Machine Type Communication device.
  • Thewireless device may be a Machine Type Communication, MTC, devicewith a channel bandwidth of up to 5MHz.
  • MTC Machine Type Communication
  • a method of allocating wireless resources for a Machine Type Communication, MTC, wirelessdevice comprising, at a wireless node: transmitting to the wireless device an allocation indication of wireless resourcesallocated to that wireless device, wherein a bandwidth of the wireless node comprises a plurality of resource blocksin the frequency domain, and wherein the allocationindication comprises: an indication of allocated resource blocks; an indication of the allocation type, wherein there are two possible allocation types: alocalized allocation of contiguous resource blocks; a distributed allocation of resource blocks.
  • a maximum size of the bandwidth may be 24 or 25 resource blocks.
  • the indication of allocated resource blocks may be a resource allocation Type 2 as defined in 3GPP TS 36. 213.
  • the wireless apparatus may be provided at a wireless node (e.g. a wireless base station) or at a wireless device (e.g. user equipment, UE) .
  • a wireless node e.g. a wireless base station
  • a wireless device e.g. user equipment, UE
  • At least one example of the disclosure provides an efficient way to signal allocation of resources to a wireless device supporting a wider channelbandwidth, such as a 5 MHz MTC device.
  • a small number of bits is required to indicate the set of resource blocks, while an allocation of resource blocks within the allocated set of resource blocks can still be made with fine granularity.
  • An index may be used to indicate the offset of the set within the serving node’s total bandwidth.
  • At least one example of the disclosure provides a hybrid downlink resource allocation (RA) method for MTC devices which support up to 5 MHz channel bandwidth. It combines the concepts of resource allocation type 2, and narrowband (NB) frequency hopping. Advantages include one or more of: scheduling flexibility; localized or distributed allocationof resource blocks; frequency diversity gain compared to other resource allocation techniques; a small signalling overhead compared to Rel-13 eMTC resource allocation; a high level of backward compatibility with previous releases of LTE standards.
  • a UE is scheduled as a 1.4MHz UE, the same granularity of scheduling can be maintained as for Rel-13 BL/CE UE.
  • a UE is scheduled as a 5MHz UE, the same granularity as for Rel-8 legacy UE is maintained.
  • the Downlink Control Indicator (DCI) signal contains the resource block allocation (RBA) bits which are used to determine the allocated frequency/time resources intended for a specific UE.
  • RBA resource block allocation
  • theresource block allocation (RBA) bits comprise RIV bits to allocate up to 25 resource block (RB) in a localized or distributed manner.
  • the RIV may be based on resource allocation type 2, but limited to a maximum allocation size of 25 or 24 PRBs.
  • At least one example of the disclosure provides a high level of scheduling flexibility asit can be used as: a method which provides frequency diversity gain by using the distributed type allocation; a method which allows channel dependent scheduling when Channel State Information (CSI) is available by using localized type allocation and/or DA offsetting; a method which provides frequency diversity gain during repetitions by enabling DA hopping; a combination of the above.
  • CSI Channel State Information
  • This scheduling flexibility is beneficial for the performance of services applicable to MTC devices like Voice over LTE (VoLTE) .
  • VoIP Voice over LTE
  • An advantage of an example of the disclosure is that it can provide a frequency diversity performance gain without requiring the use of frequency hopping.
  • frequency diversity can only be achieved through frequency hopping.
  • frequency hopping is not enabled by the serving cell.
  • hopping only occurs between subframes there is small gain with frequency hopping when there are no repetitions.
  • a distributed allocation canprovide inter-slot frequency hopping within a subframe so that diversity is also achieved with no repetitions.
  • At least one example of the disclosure enables the use of frequency hopping within system bandwidth in terms of DA units.
  • the combination of two frequency diversity techniques allows the eNodeB to exploit the entire cell bandwidth for frequency diversity gain.
  • At least one example of the disclosure can allow the same granularity in the resource allocation between alegacy 1.4MHz UEand wider bandwidth UEs, such as a 5MHz UE.
  • At least one example of the disclosure allows the contiguous RB allocation of RA type 2 localized method.
  • eNodeB wireless node
  • a user equipment apparatus configured to perform the method as described or claimed.
  • Functionality described in this disclosure are applicable to, but not limited to, bandwidth reduced low complexity UEs (BL) , or UEs in enhanced coverage (CE) , such as CE mode A devices. Functionality described in this disclosure is applicable to, but not limited to, Machine Type Communications (MTC) .
  • MTC Machine Type Communications
  • the functionality described here can be implemented in hardware, software executed by a processing apparatus, or by a combination of hardware and software.
  • the processing apparatus can comprise a computer, a processor, a state machine, a logic array or anyother suitable processing apparatus.
  • the processing apparatus can be a general-purpose processor which executes software to cause the general-purpose processor to perform the required tasks, or the processing apparatus can be dedicated to perform the required functions.
  • Another aspect of the invention provides machine-readable instructions (software) which, when executed by a processor, perform any of the described methods.
  • the machine-readable instructions may be stored on an electronic memory device, hard disk, optical disk or other machine-readable storage medium.
  • the machine-readable medium can be a non-transitory machine-readable medium.
  • the term “non-transitory machine-readable medium” comprises all machine-readable media except for a transitory, propagating signal.
  • the machine-readable instructions can be downloaded to the storage medium via a network connection.
  • Figure 1 shows a wireless communication system with a downlink and uplink communications
  • Figure 2 shows a wireless resource block forming part of the wireless resources
  • Figure 3 shows wireless resources on a downlink channel or an uplinkchannel of a wireless communication system
  • Figure 4 shows sets of resource blocks (distributions areas) for a range of different cell bandwidths
  • Figure 5 shows a method of processing an allocation indication at a wireless device
  • Figure 6A shows a tableof data for two allocation examples
  • Figure 6B shows physical resource blocks (PRBs) corresponding to the examples of Figure 6A;
  • Figure 7 shows a table of a number of sets of resource blocks (distributions areas) for a range of different cell bandwidths
  • Figure 8 shows an example table of allocation parameters for a range of different cell bandwidths with type 2 resource allocation and DCI format 1A/1B;
  • Figure 9 shows an example table of allocation parameters for a range of different cell bandwidths with type 2 resource allocation and DCI format 1C;
  • Figure 10 shows an example table of uplink allocation parameters for a range of different cell bandwidths with type 2 resource allocation under certain conditions
  • Figure 11 shows an example table of uplink allocation parameters for a range of different cell bandwidths with type 0 resource allocation
  • Figure 12 shows an example table of uplink allocation parameters for a range of different cell bandwidths for a 20MHz capable Mode A device
  • Figures 13 and 14 show packet error rate performance of allocation methods for two types of channel
  • Figure 15 schematically shows example apparatus at a wireless node or a wireless device.
  • FIG. 1 schematically shows an example ofawireless communications system with a wireless node 10 (e.g. a wireless base station) and a wireless device 20.
  • a wireless device may also be called a user equipment (UE) or a terminal.
  • Wireless communication comprises downlink (DL) transmissions from the base station to the UE and uplink (UL) transmissions from the UE to the base station.
  • DL downlink
  • UL uplink
  • Figures 2 and 3 show an example of wireless resources on a wireless channel.
  • a downlink channel will be described, although the principles mayalso be applied to an uplink channel.
  • This example is described for LTE with an Orthogonal Frequency Division Multiplexed (OFDM) modulation scheme.
  • OFDM Orthogonal Frequency Division Multiplexed
  • In the frequency domain there is a plurality of frequency subcarriers.
  • In the time domain there is a plurality of OFDM symbols. OFDM symbols are transmitted over a sub-set of the subcarriers.
  • Resources are divided intoresource elements 31.
  • a physical resource block (PRB) 30 comprises a block of resource elements.
  • Figure 2 shows a single PRB30. Thiscorresponds to one subframe in the time domain. One subframeis a time period of 1 ms. Asubframe has two slots.
  • a single PRB 30 occupies 180kHz in the frequency domain. Other sizes of PRBare possible.
  • Figure 3 shows the resources of a wireless node, such as a wireless base station 20.
  • the wireless node has a total bandwidth, which will be called a cell bandwidth 35.
  • the resources comprise a plurality of PRBs 30 of the type shown in Figure2.
  • the cell bandwidth35 is resource blocks.
  • the total cell bandwidth is divided into a plurality of sets of PRBs.
  • DA Distribution Area
  • each of the sets/DAs 40 have the same size. In this example there are twosets/DAs 40: DA0, DA1.
  • Each set/DA 40 is an area of the cell bandwidth, where the distribution of the virtual resource blocks occurs.
  • the number of sets/DAs 40 can be selected based on the total number of PRBs in the cell bandwidth.
  • the number of DAs for a given cell bandwidth may be given by where That is, the number of resource blocks in a set/DA is a minimum of the cell bandwidth or 25. So: if the cell bandwidth resource blocks, the size of the set/DA is equal to the cell bandwidth; and if the cell bandwidth resource blocks, each of the sets/DA is equal to 25 resource blocks.
  • Aset/DA size of 25 PRBs is compatible with a range of different cell bandwidths.
  • Figure 4 shows a range of cell bandwidths and a number of DAs. In the example shown in Figure 4, the smaller cell bandwidths of 1.4MHz, 3MHz and 5 MHz have a single set/DA of PRBs, while the larger cell bandwidths of 10 MHz, 15 MHz, 20 MHz have multiple sets/DAs.
  • resource block allocation type 2 There are two types of resource block allocation associated with resource allocation type 2: localized; distributed.
  • a localized allocation allocates resource blocks contiguously within a set of resource blocks/DA. That is, the allocated resource blocks are located together as one group.
  • a distributed allocation distributes, in the frequency domain, resource blocks within a set of resource blocks/DA. The distributed allocation allocates a different PRB in each of a pair of 0.5ms slots. That is, the resource blocks allocated to that UE can be interleaved with other resource blocks which are not allocated to that UE.
  • Figure 5 shows a method of processing an allocation indication at a wireless device.
  • Figures 6A, 6B show an example of each allocation type.
  • the cell bandwidth is divided into two sets/DAs: a first set/DA (DA0) of 25 PRBs and a second set/DA (DA1) of 25 PRBs.
  • Example #1 shows a localized allocationand
  • Example #2 shows a distributed allocation.
  • the UE receives a message which indicatesan allocation of resources (block 101) .
  • the message includes a Resource Indication Value (RIV) .
  • the UE uses the RIV to determine indices of virtual RBs (block 102) .
  • the method proceeds in one of two ways, depending on whether a localized allocation or a distributed allocation.
  • a flag in the allocation message received at the UE can indicate which type of allocation is being used.
  • the indices of the virtual RBs map directly to indices of PRBs, i.e. they are the same.
  • the UE determines that the virtual resource blocks are referenced by indices ⁇ 4, 5, 6, 7 ⁇ . These correspond to PRBs ⁇ 4, 5, 6, 7 ⁇ in slot 0 and ⁇ 4, 5, 6, 7 ⁇ in slot 1.
  • the UE maps the indices of virtual RBs to indices of PRBs.
  • the mapping may vary between slots.
  • the UE determines that the virtual resource blocks are referenced by indices ⁇ 4, 5, 6, 7 ⁇ .
  • the UE maps these indices ofvirtual RBs to PRBs.
  • Virtual RBs ⁇ 4, 5, 6, 7 ⁇ correspond to ⁇ 7, 13, 19, 2 ⁇ in slot 0 and ⁇ 19, 1, 7, 14 ⁇ in slot 1. It can be seen that while virtual RBs ⁇ 4, 5, 6, 7 ⁇ are consecutive, the UE maps the virtual RBs to distributed locations within the DA.
  • the distributed allocation can provide a frequency diversity advantage due to the distribution within the set/DA, and due to the different allocation in different slots.
  • 3GPP TS 36.211 defines virtual resource blocks of localized type at section 6.2.3.1 and virtual resource blocks of distributed type at section 6.2.3.2.
  • This existing scheme is intended for an allocation across afull cell bandwidth.
  • This existing scheme can be re-used, with some modifications.
  • One modification is that a resource allocation (localized or distributed) is limited to a set/DA rather than the full cell bandwidth. So, the frequency band that the resource block distribution mechanism can span is25 RBs instead of By doing this, the distribution mechanism is guaranteed that it will not span more than 25 resource blocks, and the UE will be able to receive this allocation.
  • FeMTC UEs can use a hybrid RA type 2 resource allocation method by replacing with in Section 6.2.3.2 of 3GPP TS 36.211.
  • RA type 2 method can be used as described in the existing LTE standards, as the receiver shall be able to be configured to receive all resource blocks.
  • the DA spans the same frequency band as the cell bandwidth.
  • Frequency diversity gains can be obtained by using the distributed type allocation instead of the narrowband frequency hopping method.
  • RA type 2 distributed resource allocation shall be used for frequency diversity performance gain.
  • the eNodeB if it wishes, shall be able schedule the DA of a UE to another preferable part of the cell bandwidth. This can occur when the eNodeB is aware of thechannel quality of resource blocks or resource block groups (through e.g. CQI reporting) . For that reason, the eNodeB can use some additional bits to indicate an offset value (starting from RB #0) of the DA aiming to be able to exploit the entire available cell bandwidth.
  • the number of bits needed to signal the DA offset maydepend on the cell bandwidth and the granularity (in RBs) of the offset and is given by:
  • band hopping or DA hopping.
  • 3GPP standards define narrowband hopping. This allows a UE to hop between narrowbandswithin a cell bandwidth.
  • band hopping is enabled, the UE can use the DA offset index to derive the starting position of the DA and follow a similar to Release 13 hopping pattern signalled by higher layers to hop the DA during repetitions.
  • the UE hops between DAs.
  • the UE can occupy a contiguous group of PRBs (localized allocation) or a distributed number of PRBs (distributed allocation) and then hop to a different DA within the cell bandwidth and occupy PRBs within the new DA.
  • the hopping between DAs is shown in Figure 4.
  • the number of DA offset or hopping positions (including the no hopping case) will be dependent on the cell bandwidth and the DA offset granularity given by the tableshown in Figure 7.
  • Hybrid RA type 2 localized without DA hopping.
  • All RBs can be accessed by a combination of localized allocation within the DA, and a DA offset. It may not be used for repetitions when the channel is not stationary or near stationary as the quality of the selected RBs might be degraded during the repetition procedure.
  • Hybrid RA type 2 localized with DA hopping.
  • This maybe used when the eNodeB is using repetitions and wants to use a simple allocation mechanism but also to exploit frequency diversity. This option avoids the additional scheduling complexity of distributed RA type 2, however, it allows certain level of frequency diversity gains by enabling DA hopping.
  • Hybrid RA type 2 distributed without DA hopping.
  • the eNodeB desires to perform a simplified allocation in a wider band level (25 RBs) and not in a RB level. Thus, it chooses the best offset to guide the DA into the area with the best quality. Within this area, performance if further improved by the distribution mechanism.
  • the eNodeB has no (reliable) channel quality information.
  • the offset in used for scheduling multiplexing purposes of additional UEs.
  • This option maybe used with repetitions when the channel is generally stationary. It shall not be used for repetitions when the channel is not stationary or near stationary as the quality of the selected offset might not always be the best one during the whole repetition procedure.
  • Hybrid RA type2 distributed with DA hopping.
  • it enables both of the available frequency diversity techniques, distributed type and hopping. It can be used for repetitions, especially for a non-stationary channel.
  • anewDownlink Control Information (DCI) format is a hybrid DCI between DCI 6-1A and the DCI formats 1A, and 1B (RA type 2 part) .
  • the proposed resource block assignment (RBA) bit-stream comprises:
  • DA offset bits to indicate DA offset, applicable only when The number of DA offset bits depends on the cell bandwidth and the offset granularity which is selected to be: This is a fitting granularity as it keeps the signaling overhead low and because it is a common factor for cell bandwidths of 25, 50, 75 and 100 RBs.
  • DCI format 6-1A One possible implementation of a new DCI formatfor FeMTC CE mode A UEs is similar to DCI format 6-1A with the following changes:
  • the proposed DCI requires RBA bits, similar to Release 8 DCI formats 1A and 1B.
  • a UE which is capable of receiving up to 20 MHz cell bandwidth can interpret the RBA bits similar to the DCI formats 1A/1B. This means that the proposed DCI serves both 5 MHz and up to 20 MHz capable UEs.
  • the definition follows a similar principal to the definition of the narrowband which is defined in Section 6.2.7 of [36.211].
  • the main difference is that a narrowband has a fixed bandwidth of 6 RBs.
  • the DA can span a bandwidth from 6 to 25 RBs.
  • a distribution area is defined as n consecutive resource blocks in the frequency domain,
  • the total number of downlink distribution areas in the downlink transmission bandwidth configured in the cell is given by:
  • distribution areas are numbered in order of increasing physical resource-block number where distribution area n DA is composed of physical resource-block indices:
  • the UE When decoding the DCI the UE can derive the following resource block allocation information:
  • the final indices of the allocated physical resource can by derived by:
  • n PRB i DA +n ⁇ i DA, offset
  • DCI format 1C uses a coarser but similar resource allocation type localized/distributed compared to DCI format 1A and 1B. Thus, it requires fewer bits for indicating the RIVvalue, as shown in Figure 9. Notice that the resulting total RBA bits are less compared to the corresponding ones in Figure 8.
  • the proposal for the uplink resource allocation method for CE mode A is similar to the corresponding downlink method presented in the downlink case.
  • downlink resource allocation type 2 is very similar to uplink resource allocation type 0.
  • the distributed type allocation is replaced by uplink frequency hopping. Consequently, the downlink localized/distributed flag is replaced by the uplink frequency hopping flag.
  • the RBA length is the same between these two resource allocation methods.
  • the uplink “Distribution area” (DA) and its properties are derived by replacing with in the section “Distribution area definition” above.
  • uplink frequency hopping may be used. This may beenabled by uplink resource allocation type 0, for frequency diversity performance gain.
  • uplink resource allocation type 0 maybe combined with DA offsetting in the same way downlink resource allocation type 2 was combined with DA offsetting.
  • the uplink DA offsetting granularity can also be set to 25 RBs.
  • DA offsetting can be used by repetitions as a starting DA offset.
  • the hopping properties are configured by higher layers.
  • the resource block allocation can be achievedby replacing with in Section 5.3.4 of 3GPP TS 36.211.
  • the uplink resource allocation method can be enabled by a new uplink DCI format.
  • This DCI is common for both a 5 and a 20 MHz capable FeMTC Mode A devices.
  • a 5 MHz capable FeMTC Mode A device receives this DCI it can interpret the resource block related bits according to Figure 11.
  • a 5 MHz capable FeMTC Mode A device receives this DCI it can reuse the legacy resource uplink allocation type 0 to extract its allocated RBs.
  • a UE with 20 MHz channel bandwidth receives this DCI it can interpret the resource block related bits according to Figure 12.
  • Figure 12 provides the resource allocation bits of the legacy DCI format 0 using uplink resource allocation type 0.
  • a 20MHz capable FeMTC UE can reuse the legacy resource uplink allocation type 0 to extract its allocated RBs. Notice, that there is high level alignment of number of total resource allocation bits between Figures 11 and 12.
  • the LSB of the RIV can be discarded.
  • FIG. 13and 14 compare the packet error rate (PER) performance between the following three resource allocation methods:
  • Figure 13 shows Packet Error Rate performance for an EVA5 channel.
  • Figure 14 shows Packet Error Rate performance for an EPA5 channel.
  • Figures 13and 14 show that there is only a minorperformance gain between a localizedallocation of 12 PRBs with hopping compared to a localized allocation of 12 PRBs without hopping. In contrast, the distributed allocation provides a better performance gain.
  • Figure 15 showsapparatus at a wireless node (e.g. base station) and/or a UE which may be implemented as any form of a computing and/or electronic device, and in which embodiments of the system and methods described above may be implemented.
  • Processing apparatus 300 comprises one or more processors 301 which may be microprocessors, controllers or any other suitable type of processors for executing instructions to control the operation of the device.
  • the processor 301 is connected to other components of the device via one or more buses 306.
  • Processor-executable instructions 303 may be provided using any computer-readable media, such as memory 302.
  • the processor-executable instructions 303 can comprise instructions for implementing the functionality of the described methods.
  • the memory 302 is of any suitable type such as read-only memory (ROM) , random access memory (RAM) , a storage device of any type such as a magnetic or optical storage device.
  • Data 304 used by the processor may be stored in memory 302, or in additional memory.
  • Data 304 comprises timing data as described.
  • the processing apparatus 300 comprises a wireless transceiver 308.
  • ′user equipment′ refers to any device with processing and telecommunication capability such that it can perform the methodsand functionsaccording to the examplesof the present invention.
  • UE user equipment
  • UE includes mobile telephones, personal digital assistants, PCsand many other devices.
  • ′an′ item refers to one or more of those items.
  • ′comprising′ is used herein to mean including the method blocks or elements identified, but that such blocks or elements do not comprise an exclusive list and a method or apparatus may contain additional blocks or elements.

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

Abstract

L'invention concerne un procédé d'attribution de ressources sans fil pour un dispositif sans fil, tel qu'un dispositif de communication de type machine, lequel procédé d'attribution de ressources sans fil consiste au niveau d'un nœud sans fil à transmettre au dispositif sans fil une indication d'attribution de ressources sans fil attribuées à ce dispositif sans fil. Une bande passante du nœud sans fil comprend une pluralité de blocs de ressources dans le domaine de fréquence. La bande passante totale comprend une pluralité d'ensembles de blocs de ressources, chaque ensemble de blocs de ressources comprenant un nombre entier n de blocs de ressources consécutifs dans le domaine de fréquence. L'indication d'attribution comprend : une indication de blocs de ressources attribués dans un des ensembles de blocs de ressources; une indication de l'ensemble attribué de blocs de ressources dans la bande passante de nœuds. Chaque ensemble peut être limité à 24 ou 25 blocs de ressources.
PCT/CN2017/108397 2016-11-04 2017-10-30 Systèmes et procédés d'attribution de ressources sans fil WO2018082527A1 (fr)

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CN109906654A (zh) 2019-06-18

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