WO2021048581A1 - Procédé de détection de canal de commande dans un fonctionnement à large bande - Google Patents

Procédé de détection de canal de commande dans un fonctionnement à large bande Download PDF

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Publication number
WO2021048581A1
WO2021048581A1 PCT/IB2019/001094 IB2019001094W WO2021048581A1 WO 2021048581 A1 WO2021048581 A1 WO 2021048581A1 IB 2019001094 W IB2019001094 W IB 2019001094W WO 2021048581 A1 WO2021048581 A1 WO 2021048581A1
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WO
WIPO (PCT)
Prior art keywords
coreset
search space
control channel
subbands
subband
Prior art date
Application number
PCT/IB2019/001094
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English (en)
Inventor
Hao Lin
Original Assignee
Orope France Sarl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Orope France Sarl filed Critical Orope France Sarl
Priority to CN201980100199.6A priority Critical patent/CN114375554A/zh
Priority to PCT/IB2019/001174 priority patent/WO2021048588A1/fr
Priority to CN201980100140.7A priority patent/CN114342303A/zh
Publication of WO2021048581A1 publication Critical patent/WO2021048581A1/fr
Priority to US17/559,644 priority patent/US12101273B2/en
Priority to US17/561,611 priority patent/US12058075B2/en

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Classifications

    • 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
    • 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
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • 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]

Definitions

  • the present disclosure relates to the field of communication technologies, and in particular, to a method for control channel transmission and detection in wideband operation, between a base station (BS) and a user equipment (UE).
  • BS base station
  • UE user equipment
  • the communication technology is for example a 5G (fifth generation) network using the 5G NR (New Radio) as radio access technology (RAT) defined by 3GPP.
  • 5G NR New Radio
  • RAT radio access technology
  • the present disclosure is applicable to 5G NR-U (NR in unlicensed spectrum), but also to 5G NR (NR in licensed spectrum).
  • the UE detects the physical downlink control channel (PDCCH) via checking the PDCCH candidates within its corresponding control-resource set (CORESET) based on the control- channel element (CCE) index.
  • PDCCH physical downlink control channel
  • CORESET control-resource set
  • CCE control- channel element
  • the CORESET defines the time frequency resources for the BS to transmit the control signal.
  • the CORESET In frequency domain the CORESET is defined as a multiple of 6 resource blocks (RB) within the bandwidth part (BWP).
  • the CORESET bandwidth can go beyond the BWP.
  • the CORESET In time domain, the CORESET can be configured to have 1 ,2 or 3 OFDM symbols.
  • the CORESET defines the time-frequency resources for a BS to transmit the control channel.
  • the search space set defines the monitoring occasion, which is equivalent to the concrete time location where the BS can send the control channel in the CORESET.
  • the search space set is linked to CORESET and additionally provides a periodicity (in slot) and a time location (in symbol).
  • a search space is associated with a CORESET which has two OFDM symbols.
  • the search space set configures the monitoring occasion once every two slots and starts from slot 0.
  • the monitoring slots are slot 0,2,4,... ⁇
  • the search space set further configures that the monitoring starting symbols are at symbol indexes 0 and 7.
  • the possible resources for the BS to send the control channels are the time-frequency resources configured in CORESET which appear only in the monitoring slot, in which it starts at symbol indexes 0 and 7.
  • each partition will contain a PDCCH candidate.
  • the number of the partitions aka PDCCH candidates can be configured by the BS in the search space.
  • PDCCH candidate and AL are configured also in search space. Typically, multiple AL values can be configured within the same search space; and the PDCCH candidate number is associated with each AL.
  • the unlicensed spectrum is a shared spectrum.
  • the communication equipment in different communication systems can use the spectrum as long as it meets the regulatory requirements set by the country or region on the spectrum, and does not need to apply for a proprietary spectrum authorization from the government.
  • some countries or regions specify regulatory requirements that must be met to use unlicensed spectrum.
  • the communication device follows the principle of “Listen Before Talk (LBT)”, that is, the device needs to perform channel sensing before transmitting the signal on the channel. Only when the LBT outcome shows that the channel is idle, the device can perform signal transmission; otherwise, the device cannot perform signal transmission. In order to ensure fairness, once a devices successfully occupies the channel, the transmission duration cannot exceed the Maximum Channel Occupancy Time (MCOT).
  • LBT Listen Before Talk
  • BS and UE can operate in a wider band which consists of multiple subbands (SBs).
  • bandwidth part is a subset of contiguous common resource blocks on a given carrier.
  • a UE can be configured with an active BWP which contains multiple subbands, as shown in Figure 3A.
  • the sender i.e. BS
  • LBT Listen-before-Talk
  • a first object of the present disclosure is a method for control channel transmission in wideband operation performed in a base station, comprising the steps of:
  • SSG search space group
  • CORESET control resource set
  • LBT listen before talk
  • Such method allows the base station to realize control channel transmission in wideband operation without increasing the number of CORESET per bandwidth part thanks to the ability to transmit the control channel within in one CORESET in several subbands by using a search space group containing several search space sets.
  • each CORESET reference and shifted ones
  • it ensures that any unavailable subband will not prevent transmitting the control channel within CORESET in another subband as it would be the case with CORESET covering multiple subbands.
  • frequency shifted CORESET it also does not impair the number of usable CORESET per bandwidth part.
  • the method ensures that control channel transmission is performed in available subbands.
  • the at least one frequency shifted CORESET is also time shifted and wherein the reference CORESET and the at least one frequency and time shifted CORESET shares the same CORESET index.
  • each search space set of the SSG configures monitoring occasion with a slot periodicity defining monitoring slots and at least one time location defining at least one monitoring starting time within said monitoring slots.
  • an explicit indication of the CORESET frequency shift is provided.
  • an implicit indication of the CORESET frequency shift is provided using a pre-defined index ordering of the different search space sets within said at least search space group.
  • Using an explicit indication of the CORESET frequency shift allows the user equipment to detect, through the search space configuration, the frequency shift with respect to the reference CORESET to be performed for monitoring occasion in the next subband. Implicit indication is also possible and it reduces data transmission. For implicit indication, it needs configuration of a starting frequency, i.e. the one containing the reference CORESET, and then automatically switching to monitoring occasion in the next subband according to a pre-determined search space index ordering.
  • the method further comprises the step of either configuring, when more than one subband is available, a restriction to one available subband containing the configured reference CORESET or one frequency shifted CORESET of the reference CORESET associated with the configured at least one search space group; or configuring, when more than one subband is available, a restriction to at least one part of the configured reference CORESET or one frequency shifted CORESET of the reference CORESET associated with the configured at least one search space group.
  • the CORESET are based on the control-channel element (CCE) index and a valid search space set is defined as a search space set which corresponding CORESET is in an available subband, and the method further comprises the step of configuring, when the total number of CCE of the corresponding CORESET of valid search space sets exceeds a pre-defined threshold, to switch off some CCE from being monitored.
  • CCE control-channel element
  • the method further comprises the step of either explicitly configuring the restriction through a Radio Resource Control (RRC) configuration ; or implicitly configuring the switch off from one pre-defined CCE index.
  • RRC Radio Resource Control
  • the method further comprises the step of signalling the available subbands via an explicit indication within a control signal (GC-PDCCH).
  • GC-PDCCH control signal
  • DMRS pre-known signal
  • a second object of the present disclosure is a method for control channel detection in wideband operation performed in a user equipment (UE), comprising the steps of:
  • - monitoring at least one search space group associated with a reference CORESET confined in one subband among the plurality of subbands and containing at least two search space sets, by: o monitoring, within said one subband, one search space set of the SSG containing the reference CORESET and o monitoring, within at least another subband, the at least another search space set of the SSG containing a frequency shifted CORESET of the reference CORESET confined in the at least another subband among the plurality of subbands; o the reference CORESET and the at least one frequency shifted CORESET sharing the same CORESET index (CORESETJD 1);
  • Such method allows the user equipment to realize control channel detection in wideband operation without increasing the number of CORESET per bandwidth part thanks to the ability to detect the control channel within in one CORESET in several subbands by using a search space group containing several search space sets.
  • each CORESET reference and shifted ones
  • it ensures that any unavailable subband will not prevent detecting the control channel within CORESET in another subband as it would be the case with CORESET covering multiple subbands.
  • frequency shifted CORESET it also does not impair the number of usable CORESET per bandwidth part.
  • the method ensures that control channel detection is only performed in available subbands.
  • the at least one frequency shifted CORESET is also time shifted and wherein the reference CORESET and the at least one frequency and time shifted CORESET shares the same CORESET index.
  • each search space set of the SSG configures monitoring occasion with a slot periodicity defining monitoring slots and at least one time location defining at least one monitoring starting time within said monitoring slots.
  • the method further comprises a step of detecting an explicit indication of the CORESET frequency shift.
  • the method comprises a step of detecting an implicit indication of the CORESET frequency shift using a pre-defined index ordering of the different search space sets within said at least search space group.
  • the method comprises the step of detecting available subbands via an explicit indication within a control signal (GC-PDCCH).
  • the method comprises the step of detecting available subbands via an implicit indication through a transmission of a pre-known signal (DMRS).
  • DMRS pre-known signal
  • a valid search space set is defined as a search space set which corresponding CORESET is in an available subband, and the method further comprises the step of selecting one SSG containing at least one valid search space set.
  • Such method ensures efficient detection of the control channel through monitoring occasion being only performed in available subbands and selecting one SSG containing at least one valid search space set.
  • the selected SSG contains multiple valid search space sets
  • the method comprises the step of either selecting one one valid search space set from the the valid search space sets; or selecting at least one part of the valid search space sets.
  • the method comprises the step of detecting the selected valid search space set(s) either through an explicit indication in the RRC configuration or through an implicit indication of a pre-defined CCE index value.
  • the base station configures a number of control channel candidates within each search space set of the SSG and the method comprises the step of selecting within the valid search spaces, only search spaces which have monitoring occasion in a current slot, if the number of control channel candidates exceed a pre-defined maximum number within each valid search space set.
  • the base station configures a number of control channel candidates within each search space set of the SSG and the CORESET are based on the control-channel element (CCE) index
  • the method comprises the step of selecting the CCEs within each of the corresponding CORESET to the valid search spaces having monitoring occasion in a current slot, if the number of non-overlapped CCEs exceeds a pre-defined maximum number.
  • the number of control channel candidates within each search space set is based on at least one aggregation level of control channel elements
  • the method comprises the step of further selecting search spaces set by removing the largest aggregation level value and its corresponding control channel candidates for each search space set with more than one aggregation level value. More preferably, the method further comprises the step of further reducing the number of control channel candidates by picking only one valid search space with a number of control channel candidates lower than the pre-defined maximum number of candidates or by dividing the number of candidates for each search space by an interger value.
  • Such method allows to further reduce the total number of control channel candidates. These abnove steps would be particularly important in a crowdy environment, meaning an environment where many devices (BS and UE) are present around.
  • a third object of the present disclosure is a base station in a mobile telecommunication network, comprising a module for connecting a user equipment to the mobile telecommunication system, configured to control the execution of the method for control channel transmission defined in the first object.
  • a fourth object of the present disclosure is a user equipment comprising a module for connecting to a mobile telecommunication system, configured to control the execution of the method for control channel detection defined in the second object.
  • a fifth object of the present disclosure is a computer readable medium comprising program instructions for causing a user equipment to perform the steps of a method according to the second object.
  • a sixth object of the present disclosure is a computer readable medium comprising program instructions for causing a base station to perform the steps of a method according to the first object.
  • - Fig. 1 shows an example of a CORESET configuration
  • - Fig. 2 shows an example of a search space set associated with a CORESET
  • Fig. 3A shows a configuration with an active BWP which contains multiple subbands and Fig. 3B shows a partial transmission within the active BWP;
  • - Fig. 5 shows the association between CORESET and a search space group
  • - Fig. 6A shows a configuration a frequency and time shifted CORESET in multiple subbands
  • Fig. 6B shows the configuration of Fig. 6A after performing a LBT procedure. Description of embodiments
  • the search space is associated with the CORESET via the association between the search space index (ID) and CORESET index (ID).
  • Figure 4 shows one example of the association between CORESET and search space sets.
  • different CORESETJD are associated with different search space set ID as shown in the Table 1 below:
  • search space group which is more particularly configured for wideband operation.
  • SSG search space group
  • One search space group contains two or more search space sets.
  • Table 2 [0051] Of course, depending on the number of search space sets available, it is possible to configure several SSG, each SSG being associated with one CORESET. An example is shown in the Table 3 below:
  • LBT Listen Before Talk
  • BS configures CORESETJD 1 to be associated with a search space group, i.e. SSGJD 1 , in which there are 3 search space indexes, i.e. SSJD 1 , SSJD 2, SSJD 3. These three search space sets belong to the same search space group which is associated with the CORESET.
  • Each of the search space set has its own monitoring occasions and control channel candidate (PDCCH) numbers together with the aggregation level (AL) values.
  • PDCCH control channel candidate
  • the CORESET defines the time-frequency resources for a BS to transmit the control channel.
  • the search space group defines the monitoring occasion, which is equivalent to the concrete time location where the BS can send the control channel in the CORESET.
  • the search space group is linked to CORESET and additionally provides for each search space set a periodicity (in slot) and a time location (in symbol).
  • each search space set of the same search space group SSGJD 1 is associated with the same CORESET which has two OFDM symbols in the example.
  • Each search space set configures the monitoring occasion once every two slots and starts from slot 0.
  • the monitoring slots are slot 0,2,4,... for each search space sets SSJD 1, SSJD 2, SSJD 3.
  • monitoring occasion will occur in slot 0 for both SSJD 1 and SSJD 3, in slot 1 for SSJD 2 only, in slot 2 for SSJD 1 only, in slot 3 for SSJD 3 only, in slot 4 for SSJD 1 and SSJD 2, etc.
  • each search space set further configures the monitoring starting symbols which are in the example at symbol indexes 0 and 7 for SSJD 1 , at symbol indexes 3 and 11 for SSJD 2, and at symbol index 5 for SSJD 3.
  • the possible resources for the BS to send the control channels are the time-frequency resources configured in CORESETJD 1 which appear only in the monitoring slots, in which it starts at the defined symbol indexes.
  • subband SB2 is not available and therefore cannot Serve to transmit the control channel.
  • Each of the search space has an explicit subband shift indication, e.g. shift the reference CORESET from the original subband index n to subband index n+i.
  • the UE Before the UE receives the explicit LBT subband availability indication, e.g. via GC-PDCCH signal (i.e. Group-Common Physical Downlink Control Channel), the UE monitors all search spaces in the search space group. When the UE receives the LBT subband availability indication from the BS, it mutes the search space if its corresponding shifted CORESET falls in the unavailable LBT subband.
  • GC-PDCCH signal i.e. Group-Common Physical Downlink Control Channel
  • Example 2 Each of the search space does not have an explicit subband shift indication, but the shift version is implicitly interpreted by the search space index, e.g. ordering of the search space index. From the smallest index reflecting no shift w.r.t. the reference CORESET; and the second smallest index reflecting shift by 1 subband, and so on.
  • the UE Before the UE receives the implicit LBT subband availability indication, e.g. via DMRS signal (Demodulation Reference Signal), the UE monitors all search spaces in the search space group. When the UE receivs the LBT subband availability indication from the BS, it mutes the search space if its corresponding shifted CORESET falls in the unavailable LBT subband.
  • DMRS signal Demodulation Reference Signal
  • a valid search space set is defined as a search space set which corresponding CORESET is in an available subband.
  • iV s SG is the number of valid search spaces in a search space group
  • 1V ⁇ JD is the number of different aggregation levels configured in each valid search space index.
  • f(i,j ) is a counter which counts the number of PDCCH candidates for aggregation level j within search space index /. At some point of time, the number of the aggregated number of PDCCH candidates may exceed the max number supported by the UE. UE will then do the following selections:
  • the BS can configure the UE to monitor only one of the available subbands instead of monitoring all the available subbands.
  • the UE will only select one or a part of the valid search spaces, e.g., selecting the smallest SS_ID from all the valid SS_IDs.
  • this optional configuration can be enabled or disabled by the BS in the Radio Resource Control (RRC) configuration.
  • RRC Radio Resource Control
  • a valid search space set is defined as a search space set which corresponding CORESET is in an available subband. If in a search space group, there are multiple valid search space sets which are not switched off, all their corresponding CORESETs will fall in different subbands. Assuming in a given slot, the UE mornitoring occasions of these multiple valid search space sets fall in the same slot. Then, the total number of CCEs of these corresponding CORESETs of valid search space sets may exceed a pre-defined threshold. In such a case, the UE may be configured to switch off some CCEs from being monitored.
  • One implementation can be that the UE will switch off the same amount of the CCEs from the CORESETs, which are associated with the valid search spaces that belong to the same SSG, in each of the available subbands in the order from the largest CCE index to the lowest CCE index until the total number of CCEs falls below the pre defined threshold.
  • the UE will switch off the same amount of the CCEs from the CORESETs, which are associated with the valid search spaces that belong to the same SSG, in each of the available subbands in the order from the largest CCE index to the lowest CCE index until the total number of CCEs falls below the pre defined threshold.
  • CORESETs which are associated with the valid search spaces that belong to the same SSG
  • the mobile telecommunication system is a 5G mobile network comprising a 5G NR access network.
  • the present example embodiment is applicable to NR in unlicensed spectrum (NR-U) and also to NR in licensed spectrum (NR).
  • NR unlicensed spectrum
  • NR licensed spectrum
  • the present disclosure can be applied to other mobile networks, in particular to mobile network of any further generation cellular network technology (6G, etc.).

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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 de transmission de canal de commande dans un fonctionnement à large bande contenant une pluralité de sous-bandes réalisé dans une station de base (BS), consistant à : configurer au moins un groupe d'espaces de recherche (SSG) contenant au moins deux ensembles d'espaces de recherche différents ; configurer au moins un ensemble de ressources de commande (CORESET) confiné à l'intérieur d'une sous-bande (SB1) parmi la pluralité de sous-bandes ; associer ledit au moins un SSG avec ledit au moins un CORESET, le CORESET associé devenant un CORESET de référence ; associer le CORESET de référence et au moins un CORESET décalé en fréquence du CORESET de référence confiné à l'intérieur d'au moins une autre sous-bande (SB2, SB3) parmi la pluralité de sous-bandes, avec lesdits au moins deux ensembles d'espaces de recherche différents ; le CORESET de référence et ledit au moins un CORESET décalé en fréquence partagent le même indice de CORESET (CORESET_ID1) ; réaliser une procédure d'accès multiple avec écoute de porteuse (LBT) sur chaque sous-bande de la pluralité de sous-bandes pour détecter des sous-bandes disponibles ; transmettre, dans les sous-bandes disponibles, un canal de commande dans le CORESET de référence et le ou les CORESET décalés en fréquence.
PCT/IB2019/001094 2019-09-09 2019-09-30 Procédé de détection de canal de commande dans un fonctionnement à large bande WO2021048581A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201980100199.6A CN114375554A (zh) 2019-09-09 2019-09-30 宽带操作中用于控制信道检测的方法
PCT/IB2019/001174 WO2021048588A1 (fr) 2019-09-09 2019-10-06 Procédé de surveillance de canal de commande dans un fonctionnement à large bande
CN201980100140.7A CN114342303A (zh) 2019-09-09 2019-10-06 宽带操作中用于控制信道监听的方法
US17/559,644 US12101273B2 (en) 2019-09-09 2021-12-22 Method for control channel detection in wideband operation
US17/561,611 US12058075B2 (en) 2019-09-09 2021-12-23 Method for control channel monitoring in wideband operation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FRPCT/FR2019/052075 2019-09-09
FR2019052075 2019-09-09

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WO2022198406A1 (fr) * 2021-03-22 2022-09-29 Lenovo (Beijing) Limited Procédés et appareil de schémas d'affectation de candidats améliorés pour un pdcch amélioré

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