Wireless communication devices, methods and system for transmitting synchronization signals
By generating and mapping multiple synchronization signals with varying lengths to resource blocks based on network and channel conditions, the energy consumption and interference of synchronization signals in advanced wireless networks are optimized, improving detection rates and system performance.
Patent Information
- Application Number
- PCT/CN2024/083345
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-22
- Publication Date
- 2025-09-25
AI Technical Summary
The high energy consumption of synchronization signals (SSB) in advanced wireless networks, particularly in 6G and beyond, poses a challenge in terms of environmental sustainability and operational costs, necessitating an optimization of power consumption.
Generating multiple synchronization signals with varying sequence lengths and mapping them to resource blocks, allowing for adaptive transmission based on network, channel, and interference conditions to reduce power consumption and interference.
This approach reduces power consumption and improves synchronization signal detection rates by tailoring synchronization signal transmission to specific conditions, enhancing system performance and energy efficiency.
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Figure CN2024083345_25092025_PF_FP_ABST
Abstract
Description
WIRELESS COMMUNICATION DEVICES, METHODS AND SYSTEM FOR TRANSMITTING SYNCHRONIZATION SIGNALSTECHNICAL FIELD
[0001] The present disclosure generally relates to the field of communications technology. For instance, the present disclosure provides devices, methods, and a system for transmitting synchronization signals.BACKGROUND
[0002] Nowadays the significance of network energy efficiency has escalated, driven by a dual imperative: the necessity to mitigate environmental degradation, notably greenhouse gas emissions, and the urgency to curtail operational expenditures. The advent of the 6th Generation (6G) telecommunications technology, representing an advancement over 5G, introduces a paradigm shift towards accommodating more sophisticated services and applications. These advancements necessitate exceedingly high data transmission rates, exemplified by technologies such as Extended Reality (XR) . Consequently, this evolution towards 6G and beyond is characterized by an increase in network density, the utilization of an augmented number of antennas, broader bandwidths, and an expanded spectrum of frequency bands.
[0003] The transition towards these advanced telecommunications technologies, while promising in terms of connectivity and service quality, poses significant challenges in terms of environmental sustainability. It is imperative to ensure that the environmental footprint of the next-generation (6G and beyond) networks remains within manageable limits. Therefore, the development of innovative solutions aimed at enhancing energy efficiency in these networks is paramount.SUMMARY
[0004] A substantial portion of operational expenses for network operators is attributed to energy consumption. For instance, according to GSMA, energy costs account for approximately 23%of the total operational costs for mobile networks. A significant share of this energy expenditure is attributed to the Radio Access Network (RAN) , particularly the Active Antenna Unit (AAU) . While data centers and fiber transport systems also contribute to the overall energy consumption, their impact is comparatively lesser. The energy consumption in radio access networks can be bifurcated into two distinct components: a dynamic component, which is contingent on active data transmission and reception, and a static component, which persists irrespective of data transmission activities, maintaining the operational readiness of radio access devices.
[0005] A synchronization signal (SS) / physical broadcast channel (PBCH) block (or SSB) is the very first signal / message that a cellular device detects / decodes in order to connect to a wireless network. In a current 5G New Radio (NR) networks, a SSB spans 4 OFDM symbols in a time domain and 240 subcarriers in a frequency domain, which is illustrated in FIG. 1. A conventional resource mapping of the SSB can be found in 3GPP TS 38.211 V18.1.0 Chapter 7.4.3.
[0006] However, the SSB of this conventional design still consumes considerable power in order to guarantee coverage and fast cell access. It still remains a question as to how the SSB can be optimized in view of power consumption.
[0007] In view of the above-mentioned problems and disadvantages, the present disclosure aims to optimize energy consumption of a wireless communication network. For instance, an objective may be to reduce the power consumption caused by SSB transmission (or synchronization signal transmission) for advanced wireless mobile networks beyond 5G.
[0008] These and other objectives are achieved by this disclosure, for instance, as described in the independent claims. Advantageous implementations are further described in the dependent claims.
[0009] A first aspect of this disclosure provides a wireless communication method applied to a transmitting device. The method comprises the following steps:
[0010] - generating multiple synchronization signals based on multiple sequences;
[0011] - mapping the multiple synchronization signals to multiple resource blocks; and
[0012] - transmitting one or more of the multiple synchronization signals to one or more receiving devices using one or more of the multiple resource blocks.
[0013] The generated multiple synchronization signals may be used as candidate synchronization signals from which the transmitting device may be adapted to choose one or more suitable synchronization signals for transmission. In this way, power consumption can be reduced, and inter-cell interference can be reduced.
[0014] In an implementation form of the first aspect, the synchronization signals may comprise one or more primary synchronization signals (PSSs) and / or one or more secondary synchronization signals (SSSs) .
[0015] That is, the multiple synchronization signals may comprise:
[0016] - multiple PSSs; or
[0017] - multiple SSSs; or
[0018] - at least one PSS and at least one SSS.
[0019] Each synchronization signal (e.g., each PSS and each SSS) is detectable by a receiving device and may be used for synchronization purposes and / or L1 / L3 measurements purposes and / or cell activation purposes.
[0020] In a further implementation form of the first aspect, for transmitting the one or more synchronization signals, the method may comprise:
[0021] - obtaining one or more of: network condition information, channel condition information, and information of a neighbour cell; and
[0022] - selecting the one or more synchronization signals for transmission based on the obtained one or more of the network condition information, channel condition information, and the information of the neighbour cell.
[0023] Optionally, when the network condition information indicates that power consumption and / or network resource utilization is relatively high, one or more synchronization signals with short sequence length may be transmitted, and / or the number of the one or more synchronization signals to be transmitted may be reduced. When the network condition information indicates that power consumption and / or network resource utilization is relatively low, one or more synchronization signals with long sequence length may be transmitted, and / or the number of the one or more synchronization signals to be transmitted may be increased.
[0024] Optionally, when the channel condition information indicates a relatively good channel condition, one or more synchronization signals with short sequence length may be transmitted, and / or the number of the one or more synchronization signals to be transmitted may be reduced. When the channel condition information indicates a relatively bad channel condition, one or more synchronization signals with long sequence length may be transmitted, and / or the number of the one or more synchronization signals to be transmitted may be increased.
[0025] Optionally, when the information of the neighbour cell indicates that interference from the neighbour cell is relatively low, one or more synchronization signals with short sequence length may be transmitted, and / or the number of the one or more synchronization signals to be transmitted may be reduced. When the information of the neighbour cell indicates that interference from the neighbour cell is relatively high, one or more synchronization signals with long sequence length may be transmitted, and / or the number of the one or more synchronization signals to be transmitted may be increased.
[0026] In a further implementation form of the first aspect, for transmitting the one or more synchronization signals, the method may comprise:
[0027] - receiving an indication from the receiving device, wherein the indication is indicative of: one or more demanded sequences, or a demanded synchronization signal pattern; and
[0028] - selecting the one or more synchronization signals for transmission based on the indication.
[0029] Optionally, the one or more demanded sequences may be used to construct one or more corresponding synchronization signals. The demanded synchronization signal pattern may be used to indicate one or more resource blocks where one or more synchronization signals are carried.
[0030] In a further implementation form of the first aspect, the method may further comprise indicating, to the receiving device, one or more sequences used to generate the one or more transmitted synchronization signals.
[0031] In a further implementation form of the first aspect, the multiple resource blocks may comprise overlapping resource blocks.
[0032] In a further implementation form of the first aspect, the multiple resource blocks may comprise non-overlapping resource blocks.
[0033] A second aspect of this disclosure provides a wireless communication method applied to a receiving device. The method comprises sending an indication to a transmitting device. The indication is indicative of one or more demanded resource blocks for receiving one or more synchronization signals. The method further comprises receiving, from the transmitting device, the one or more synchronization signals using the one or more resource blocks in accordance with the indication.
[0034] A third aspect of this disclosure provides a wireless communication method applied to a receiving device. The method comprises receiving an indication from a transmitting device. The indication is indicative of one or more resource blocks carrying one or more synchronization signals. The method further comprises receiving, from the transmitting device, the one or more synchronization signals using the one or more resource blocks based on the indication.
[0035] In an implementation form of the second aspect or the third aspect, the one or more synchronization signals may comprise one or more primary synchronization signals (PSSs) and / or one or more secondary synchronization signals (SSSs) .
[0036] In a further implementation form of the second aspect or the third aspect, the method may further comprise receiving, from the transmitting device, an indication indicating one or more sequences used to generate the one or more synchronization signals.
[0037] In a further implementation form of the second aspect or the third aspect, when multiple resource blocks are used for receiving the one or more synchronization signals, the multiple resource blocks may comprise overlapping resource blocks.
[0038] In a further implementation form of the second aspect or the third aspect, when multiple resource blocks are used for receiving the one or more synchronization signals, the multiple resource blocks may comprise non-overlapping resource blocks.
[0039] In a further implementation form of the second aspect or the third aspect, in response to receiving two or more synchronization signals using two or more resource blocks, the method may comprise processing the two or more synchronization signals in a combined manner.
[0040] A fourth aspect provides a transmitting device for wireless communication. The transmitting device is configured to:
[0041] - generate multiple synchronization signals based on multiple sequences;
[0042] - map the multiple synchronization signals to multiple resource blocks; and
[0043] - transmit one or more of the multiple synchronization signals to one or more receiving devices using one or more of the multiple resource blocks.
[0044] In an implementation form of the fourth aspect, the synchronization signals may comprise one or more PSSs and / or one or more SSSs.
[0045] In a further implementation form of the fourth aspect, for transmitting the one or more synchronization signals, the transmitting device may be configured to:
[0046] - obtain one or more of: network condition information, channel condition information, and information of a neighbour cell; and
[0047] - select the one or more synchronization signals for transmission based on the obtained one or more of the network condition information, channel condition information, and the information of the neighbour cell.
[0048] In a further implementation form of the fourth aspect, for transmitting the one or more synchronization signals, the transmitting device may be configured to:
[0049] - receive an indication from the receiving device, in which the indication is indicative of: one or more demanded sequences, or a demanded synchronization signal pattern; and
[0050] - select the one or more synchronization signals for transmission based on the indication.
[0051] In a further implementation form of the fourth aspect, the transmitting device may be configured to indicate, to the receiving device, one or more sequences used to generate the one or more transmitted synchronization signals.
[0052] In a further implementation form of the fourth aspect, the multiple resource blocks may comprise overlapping resource blocks.
[0053] In a further implementation form of the fourth aspect, the multiple resource blocks may comprise non-overlapping resource blocks.
[0054] A fifth aspect of this disclosure provides a receiving device for wireless communication. The receiving device is configured to:
[0055] - send an indication to a transmitting device, in which the indication is indicative of one or more demanded resource blocks for receiving one or more synchronization signals; and
[0056] - receive the one or more synchronization signals from the transmitting device using the one or more resource blocks in accordance with the indication.
[0057] A sixth aspect of this disclosure provides a receiving device for wireless communication. The receiving device is configured to:
[0058] - receive an indication from a transmitting device, in which the indication is indicative of one or more resource blocks carrying one or more synchronization signals; and
[0059] - receive the one or more synchronization signals from the transmitting device using the one or more resource blocks based on the indication.
[0060] In an implementation form of the fifth aspect or the sixth aspect, the one or more synchronization signals may comprise one or more PSSs and / or one or more SSSs.
[0061] In a further implementation form of the fifth aspect or the sixth aspect, the receiving device may be further configured to receive, from the transmitting device, an indication indicating one or more sequences used to generate the one or more synchronization signals.
[0062] In a further implementation form of the fifth aspect or the sixth aspect, when multiple resource blocks are used for receiving the one or more synchronization signals, the multiple resource blocks may comprise overlapping resource blocks.
[0063] In a further implementation form of the fifth aspect or the sixth aspect, when multiple resource blocks are used for receiving the one or more synchronization signals, the multiple resource blocks may comprise non-overlapping resource blocks.
[0064] In a further implementation form of the fifth aspect or the sixth aspect, in response to receiving two or more synchronization signals using two or more resource blocks, the receiving device may be further configured to process the two or more synchronization signals in a combined manner.
[0065] A seventh aspect of this disclosure provides a wireless communication system comprising at least one transmitting device according to the fourth aspect, and one or more receiving devices each according to the fifth aspect or the sixth aspect.
[0066] An eighth aspect of the present disclosure provides a computer program comprising a program code for performing the method according to the first aspect or any of its implementation forms.
[0067] A ninth aspect of the present disclosure provides a computer program comprising a program code for performing the method according to the second aspect, the third aspect, or any implementation form thereof.
[0068] A tenth aspect of the present disclosure provides a non-transitory storage medium storing executable program code which, when executed by a processor (or a chipset) , causes the method according to the first aspect or any of its implementation forms to be performed.
[0069] An eleventh aspect of the present disclosure provides a non-transitory storage medium storing executable program code which, when executed by a processor (or a chipset) , causes the method according to the second aspect, the third aspect, or any implementation form thereof.
[0070] It has to be noted that all devices, elements, units and means described in the present application could be implemented in the software or hardware elements or any kind of combination thereof. All steps which are performed by the various entities described in the present application as well as the functionalities described to be performed by the various entities are intended to mean that the respective entity is adapted to or configured to perform the respective steps and functionalities.
[0071] Even if, in the following description of the present disclosure, a specific functionality or step to be performed by external entities is not reflected in the description of a specific detailed element of that entity which performs that specific step or functionality, it should be clear for a skilled person that these methods and functionalities can be implemented in respective software or hardware elements, or any kind of combination thereof.BRIEF DESCRIPTION OF DRAWINGS
[0072] The above-described aspects and implementation forms will be explained in the following description in relation to the enclosed drawings, in which:
[0073] FIG. 1 shows a time and frequency structure of a legacy synchronization signal / PBCH block;
[0074] FIG. 2 shows examples of primary synchronization signal designs;
[0075] FIG. 3 shows examples of secondary synchronization signal designs;
[0076] FIG. 4 shows an example of synchronization signal transmission pattern;
[0077] FIG. 5 show a diagram of a method applied to a transmitting device;
[0078] FIG. 6 shows a diagram of a method applied to a receiving device;
[0079] FIG. 7 shows a diagram of a further method applied to a receiving device; and
[0080] FIG. 8 shows an example of a communication system.DETAILED DESCRIPTION OF EMBODIMENTS
[0081] A list of key terms and their acronyms / abbreviations used in the present disclosure is given as follows: 3rd Generation Partnership Project -3GPP; Broadcast Channel -BCH; Binary Phase-Shift Keying –BPSK; Base Station –BS; Cyclic Redundancy Check –CRC; Downlink Control Information –DCI; Downlink –DL; Demodulation Reference Signal –DMRS; next-Generation Node B or gNodeB –gNB; Low-Density Parity-Check –LDPC; New Radio –NR; Medium Access Control –MAC; MAC Control Element –MAC CE; Modulation and Coding Scheme –MCS; Master Information Block -MIB; Physical Broadcast Channel –PBCH; Physical Downlink Control Channel –PDCCH; Physical Downlink Shared Channel -PDSCH; Primary Synchronization Signal -PSS; Physical Uplink Control Channel –PUCCH; Physical Uplink Shared Channel –PUSCH; Radio Access Technology –RAT; Radio Access Network –RAN; Resource Block -RB; Resource Element -RE; Radio Network Temporary Identifier –RNTI; Cell RNTI –C-RNTI; Paging RNTI –P-RNTI; Quaternary Phase Shift Keying - QPSK; Radio Resource Control –RRC; Subcarrier –SC; Synchronization Signal –SS, Synchronization Signal / PBCH Block –SSB; Secondary Synchronization Signal -SSS; Uplink –UL; User Equipment –UE; Dynamic Spectrum Sharing –DSS; Primary Cell –PCell; Secondary Cell -SCell.
[0082] Cell search is a procedure for a UE to acquire time and frequency synchronization with a cell and to detect Physical layer Cell ID (PCI) of the cell. During cell search operations that are carried out when a UE is powered ON, mobility in connected mode, idle mode mobility (e.g. reselections) , inter-RAT mobility to NR system etc., the UE uses synchronization signals to derive necessary information required to access the cell.
[0083] Two types of synchronization signals are defined for NR: Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) . PSS and SSS are broadcast physical layer signals that are used for initial access (including synchronization, determining Physical Cell ID, etc. ) , L1 / L3 measurements, and / or Scell activation procedures. PBCH is used to transmit MIB to UEs. The SSB normally comprises a PSS, a SSS and PBCH. FIG. 1 shows a time and frequency structure of a legacy SSB, which exhibits the following characteristics:
[0084] - the PSS, SSS and PBCH are together in consecutive OFDM symbols;
[0085] - Each SSB occupies 4 OFDM symbols in the time domain and spread over 240 subcarriers (20 RBs) in the frequency domain;
[0086] - The PSS occupies the first OFDM symbol and span over 127 subcarriers;
[0087] - The SSS is located in the third OFDM symbol and span over 127 subcarriers. There are several (e.g. eight) un-used subcarriers below SSS and several (e.g. nine) un-used subcarriers above SSS;
[0088] - The PSS and SSS has a fixed sequence length and fixed RE mapping.
[0089] FIG. 2 shows examples of primary synchronization signal designs according to this disclosure.
[0090] According to this disclosure, multiple primary synchronization signals (e.g., PSS 1 and PSS 2) may be generated by a transmitting device (e.g., a gNB) based on multiple sequences. The multiple sequences may be of different lengths. Each sequence is used to generate a corresponding primary synchronization signal. The generated multiple primary synchronization signals may be of different lengths. The multiple primary synchronization signals are mapped to multiple resource blocks. The transmitting device is configured to transmit one or more of the multiple primary synchronization signals to a receiving device (e.g., a UE) .
[0091] For instance, if a UE is in a good channel condition, a gNB may transmit a PSS that is associated with a relatively shorter sequence to the UE. If the UE is in a relatively bad channel condition, the gNB may transmit a PSS that is associated with a relatively longer sequence to the UE, or may transmit two (or more) PSSs together to the UE. It is noted that whether a channel condition is good or bad may be determined based on a pre-set threshold. It is also noted that other factors such as interference from neighboring cell (s) and network load may also affect which synchronization signal (s) to transmit.
[0092] Optionally, the UE may be configured to request PSS 1 alone, PSS 2 alone, or PSS 1 and PSS 2 together based on its own measurement. The UE request may be sent using RRC, MAC CE, or any other configuration messages. Alternatively, the gNB may determine whether to transmit PSS 1 alone, PSS 2 alone, or PSS 1 and PSS 2 together to the UE (s) based on different UE (s) measurement report (s) and / or neighboring cell (s) information.
[0093] In this way, unnecessary power can be saved for UEs that are in good channel conditions. Moreover, synchronization signal detection rate can be improved for UEs that are in bad channel conditions. Overall, system performance can be improved, and energy consumption can be reduced.
[0094] As illustrated in FIG. 2, the multiple PSSs may be mapped to multiple resource blocks for transmission. In general, M candidate PSS sequences may be generated and may be mapped to M blocks, M being an integer larger than one. The size of the sequences / blocks may be equal or not equal.
[0095] In a block-based design shown in FIG. 2, blocks 211, 212 are not overlapping. For instance, if M =2, then two candidate PSSs (PSS 1 and PSS 2) are generated. PSS1 and PSS2 are mapped to two blocks. Three possible transmission options are possible: 1) PSS 1 alone, 2) PSS 2 alone, 3) PSS 1 and PSS 2. The UE may ask for a possible transmission option. The gNB decides the suitable transmission based on the different UEs requests and / or network conditions and / or inter-cell interference. Detection of PSS 1 may happen on block 211 and detection of PSS 2 can happen on block 212. If PSS 1 and PSS 2 are sent at the same time, then the UE may be adapted to combine the processing of PSS 1 and PSS 2 to have better detection of PSS.
[0096] Alternatively, in a nested design shown in FIG. 2, the multiple resource blocks may comprise overlapping blocks 221, 222, or partial overlapping blocks 231, 232. PSS 1 may be of a larger length which leads to a better detectability but requires more transmission power. In this case, two possible transmission options are possible: 1) PSS 1 alone, 2) PSS 2 alone, which can be determined by either the UE or the gNB similarly mentioned above in the block-based design.
[0097] FIG. 3 shows examples of secondary synchronization signal designs according to this disclosure. FIG. 3 is illustrated using a secondary synchronization signal as an example. Similar to FIG. 2, multiple SSSs may be generated. The multiple SSSs are mapped to multiple resource blocks for transmission. The multiple resource blocks may comprise non-overlapping blocks 311, 312. Alternatively or additionally, the multiple resource blocks may comprise overlapping blocks 321, 322, or partial overlapping blocks 331, 332.
[0098] The examples shown in FIG. 2 and FIG. 3 may be combined in a single SSB. The number and lengths of the PSS / SSS in FIG. 2 and FIG. 3 are for illustration purposes only.
[0099] Optionally, each generated synchronization signal (PSS / SSS) with a particular length may be indexed. For instance, the index may be an ID or a parameter associated with each synchronization signal as an index. Optionally, the index may be integrated into the generation of each synchronization signal, or may be carried by MIB or SIB1. In this way, the transmitting device and the receiving device may use a particular index to refer to a particular PSS / SSS.
[0100] Optionally, the gNB may be configured to activate or deactivate the dynamic PSS / SSS transmission shown in FIG. 2 and FIG. 3. This activation or deactivation may be based on network condition information such as traffic load. For instance, when the traffic load is relatively high, the gNB may be configured to deactivate the dynamic PSS / SSS transmission and switch to legacy design. When the traffic load is relative low, the gNB may be configured to activate the dynamic PSS / SSS transmission. The activation / deactivation may be sent using MAC CE, RRC, or any other control messages.
[0101] FIG. 4 shows an example of synchronization signal transmission pattern according to this disclosure. For instance, a radio subframe may comprise two slots. In each slot, one or more SSBs may be transmitted. In each SSB, resources may be reserved for transmitting synchronization signals. This disclosure may be applied to said reserved resources. The SSBs shown in FIG. 4 are merely for illustration purposes only. It is noted that the synchronization signal design (e.g., the PSS / SSS transmission pattern) of this disclosure may be transmitted without PBCH, or with a traditional PBCH, or with a newly designed PBCH, which is not limited in this disclosure.
[0102] FIG. 4 shows three SSBs (or three possible synchronization signal detection windows) that can be used by a transmitting device (e.g., a gNB) to transmit synchronization signals. The first SSB 410 (or window) may be used to transmit a PSS and a SSS of relatively short length (e.g., PSS 2 and SSS 2 shown in FIG. 2 and FIG. 3 respectively) that are highly detectable by a UE that is in relatively good channel conditions. The second SSB 420 may be used to transmit a PSS and a SSS of relatively long length (e.g., PSS 1 and SSS 1 shown in FIG. 2 and FIG. 3 respectively) that are highly detectable by a UE that is in relatively bad channel conditions. The third SSB 430 may be used to transmit both PSSs and SSSs of various length, such that the detection probability may be further increased.
[0103] As another example not shown in FIG. 4, it is also possible that SSB 410 are repeatedly transmitted in a first subframe; SSB 420 are repeatedly transmitted in a second subframe; and SSB 430 are repeatedly transmitted in a third subframe.
[0104] It is noted that the number, the transmission pattern, and the location of synchronization signals shown in FIG. 4 is for illustration purposes only. The synchronization signals may be arranged in any suitable resource location of a frequency-time domain. It is also noted that the size of PSS / SSS and PBCH are enlarged in FIG. 4 for the sake of clarity and does not reflect a true size of the PSS / SSS / PBCH in a subframe.
[0105] It is further noted that any one or more of the synchronization signal patterns 211+212, 221+222, 231+232, 311+312, 321+322, 331+332 shown in FIG. 2 and FIG. 3 may be, either individually or combinedly, applied to any resource grid (time- frequency resources) where a synchronization signal is allowed to be transmitted. Optionally, any of the synchronization signal patterns shown in FIG. 2 and FIG. 3 may be compatible with the legacy SSB design shown in FIG. 1. For instance, it is possible that the PSS transmission still follows the legacy design shown in FIG. 1, while the SSS transmission may follow any pattern shown in FIG. 3. Optionally, the synchronization signal patterns shown in FIG. 2 and FIG. 3 may follow the same repetition patterns of the legacy PSS / SSS or may follow new repetition patterns based on cell configurations.
[0106] FIG. 5 shows a diagram of a method 500 according to this disclosure. The method is applied to a transmitting device and comprises the following steps:
[0107] Step 501: generating multiple synchronization signals based on multiple sequences;
[0108] Step 502: mapping the multiple synchronization signals to multiple resource blocks; and
[0109] Step 503: transmitting one or more of the multiple synchronization signals to one or more receiving devices using one or more of the multiple resource blocks.
[0110] FIG. 6 shows a diagram of a method 600 according to this disclosure. The method is applied to a receiving device (e.g., a UE) and comprises the following steps:
[0111] Step 601: sending an indication to a transmitting device (e.g., a gNB) , in which the indication is indicative of one or more demanded resource blocks for receiving one or more synchronization signals; and
[0112] Step 602: receiving, from the transmitting device, the one or more synchronization signals using the one or more resource blocks in accordance with the indication.
[0113] In this disclosure, the PSS / SSS sequences may be adapted according to UE demand. For instance, when a UE is in connected mode, the UE may be adapted to request a particular PSS / SSS sequence.
[0114] Optionally, the UE may be informed that the gNB (as a transmitting device) support the dynamic PSS / SSS transmission of this disclosure. To this end, the gNB may send flag information or activation information through any control signalling to the UE informing that the dynamic PSS / SSS transmission of this disclosure is supported / enabled. Alternatively, one or more channel quality related conditions may be pre-set (known by the UE and the gNB) to activate the dynamic PSS / SSS transmission of this disclosure.
[0115] Optionally, the gNB may be configured to activate or deactivate on-demand PSS / SSS functionality from the UE. For instance, when there is low traffic (network resource utilization is low) , the gNB can configure the UEs to demand PSSs / SSSs based on their need (according to UE traffic or when the measurements of the UE fulfil certain condition) .
[0116] When the traffic is high, then UEs are forbidden to demand particular PSSs / SSSs. The gNB can send deterministic patterns of PSSs / SSSs.
[0117] Optionally, the UE may be adapted to send a request to the gNB requesting the dynamic PSS / SSS transmission to be used.
[0118] In step 601, the indicated one or more demanded resource blocks may be determined by the UE based on channel measurements, e.g., estimations of channel quality based on SSB or CSI-RS or any other reference resources.
[0119] Based on the one or more received synchronization signals, the UE may be adapted to perform synchronization, measurements, and / or activation of SCells.
[0120] FIG. 7 shows a diagram of a method 700 according to this disclosure. The method is applied to a receiving device (e.g., a UE) and comprises the following steps:
[0121] Step 701: receiving an indication from a transmitting device (e.g., a gNB) , wherein the indication is indicative of one or more resource blocks carrying one or more synchronization signals; and
[0122] Step 702: receiving, from the transmitting device, the one or more synchronization signals using the one or more resource blocks based on the indication.
[0123] In this disclosure, the PSS / SSS sequences may be adapted according to network decision. Optionally, the UE may be informed that the gNB (as a transmitting device) support the dynamic PSS / SSS transmission of this disclosure. To this end, the gNB may send flag information or activation information through any control signalling to the UE informing that the dynamic PSS / SSS transmission of this disclosure is supported / enabled. Alternatively, one or more channel quality related conditions may be pre-set (known by the UE and the gNB) to activate the flexible PSS / SSS transmission of this disclosure. Optionally, the UE may be adapted to send a request to the gNB requesting the dynamic PSS / SSS transmission to be used.
[0124] Before step 701, the UE may be configured to send measurement report (s) to the gNB. Based on the UE measurement report (s) and / or neighbouring cell information, the gNB may decide to determine one or more suitable PSS / SSS sequences out of the multiple PSS / SSS sequences.
[0125] FIG. 8 shows an example of a communication system 800 according to this disclosure. The communication system 800 comprises a gNB 810 which corresponds to the transmitting device disclosed in FIG. 1-7, and three UEs 820, 840, 860, each corresponding to the receiving device disclosed in FIG. 1-7.
[0126] In this example, the first UE 820 is of the best channel condition, the second UE 840 is of an intermediate channel condition, the third UE 840 is of the worst channel condition. According to this disclosure, the gNB 810 as the transmitting device is configured to generate multiple synchronization signals (PSSs / SSSs) . Only the PSS is illustrated in FIG. 8 for the sake of simplicity. The gNB 810 may be configured to transmit PSS 1 with a relatively short length (e.g., as shown in FIG. 2) to the first UE 820. The gNB 810 may be configured to transmit PSS 2 with a relatively long length (e.g., as shown in FIG. 2) to the second UE 840. The gNB 810 may be configured to transmit both PSS 1 and PSS 2 to the third UE 860. Alternatively, if there is a further PSS that is even longer than PSS 1 and PSS 2, the gNB 810 may be configured to transmit the further PSS to the third UE 860.
[0127] In general, the present disclosure provides a dynamic PSS / SSS signal design. The dynamic PSS / SSS signal design may be UE-specific or UE group-specific. Multiple PSS / SSS signals are generated adaptable to UEs channel conditions. Each PSS / SSS may be used for initial access (including synchronization, determining Physical Cell ID, etc. ) , L1 / L3 measurements, and / or SCell activation procedures. UEs with good channel conditions may be assigned with shorter synchronization signals (e.g., PSS 2 shown in FIG. 2 and / or SSS 2 shown in FIG. 3) , while UEs with bad channels conditions may be assigned with longer synchronization signals (e.g., PSS 1 shown in FIG. 2 and / or SSS 1 shown in FIG. 3) . Several signalling mechanisms are introduced. For instance, a first signalling may be used to activate / deactivate the dynamic PSS / SSS transmission pattern. If the dynamic PSS / SSS transmission pattern is deactivated, the legacy PSS / SSS transmission pattern may be used. A second signalling may be used to activate / deactivate UE-demand PSS / SSS transmission. If the UE-demand PSS / SSS transmission is deactivated, then the UE does not request particular PSS / SSS transmission pattern and shall follow the PSS / SSS transmission pattern indicated by the gNB. A third signalling may be used to indicate which PSS / SSS transmission pattern is used.
[0128] This disclosure may be applied to UEs in any state, e.g., connected UEs, idle UE, or inactive UEs. It can be used for any type of cells, e.g., a normal cell, a PCell, or a SCell. Optionally, the PSS / SSSs of this disclosure may coexist with legacy NR PSS / SSS in case of DSS cells. This disclosure is also compatible with an idle UE or inactive UE, since the idle / inactive UE may be adapted to blindly search for all possible PSS / SSS signals, even in the case where the dynamic PSS / SSS transmission pattern of this disclosure is mandated in related specifications. In this case, the number of possible sequences may be limited (e.g., limited to two PSSs and / or two SSSs) . Furthermore, non-overlapping pattern may be used such that the idle / inactive UE may add up autocorrelation calculations based on the PSSs and / or SSSs transmitted on the non-overlapping blocks.
[0129] The present disclosure may be applied to any telecommunications networks / systems, such as but not limited to 5G (or NR) , 6G mobile networks, and the like. The transmitting device and the receiving device in this disclosure each may comprise processing circuitry or a chipset (not shown) configured to respectively perform, conduct or initiate the various operations described herein. The processing circuitry may comprise hardware and software. The hardware may comprise analog circuitry or digital circuitry, or both analog and digital circuitry. The digital circuitry may comprise components such as application-specific integrated circuits (ASICs) , field-programmable arrays (FPGAs) , digital signal processors (DSPs) , or multi-purpose processors. Optionally, the processing circuitry (or the chipset) comprises one or more processors and a non-transitory memory connected to the one or more processors. The non-transitory memory may carry executable program code which, when executed by the one or more processors, causes the devices to perform, conduct or initiate the operations or methods described herein.
[0130] The present invention has been described in conjunction with various embodiments as examples as well as implementations. However, other variations can be understood and effected by those persons skilled in the art and practicing the claimed invention, from the studies of the drawings, this disclosure and the independent claims. In the claims as well as in the description the word “comprising” does not exclude other elements or steps and the indefinite article “a” or “an” does not exclude a plurality. A single element or other unit may fulfill the functions of several entities or items recited in the claims. The mere fact that certain measures are recited in the mutual different dependent claims does not indicate that a combination of these measures cannot be used in an advantageous implementation.
Claims
1.A wireless communication method (500) applied to a transmitting device, the method comprising:generating (501) multiple synchronization signals based on multiple sequences;mapping (502) the multiple synchronization signals to multiple resource blocks; andtransmitting (503) one or more of the multiple synchronization signals to one or more receiving devices using one or more of the multiple resource blocks.2.The method (500) according to claim 1, wherein the synchronization signals comprise one or more primary synchronization signals and / or one or more secondary synchronization signals.3.The method (500) according to claim 1 or 2, wherein for transmitting the one or more synchronization signals, the method comprises:obtaining one or more of network condition information, channel condition information, and information of a neighbour cell; andselecting the one or more synchronization signals for transmission based on the obtained one or more of the network condition information, channel condition information, and the information of the neighbour cell.4.The method (500) according to claim 1 or 2, wherein for transmitting the one or more synchronization signals, the method comprises:receiving an indication from the receiving device, wherein the indication is indicative of: one or more demanded sequences, or a demanded synchronization signal pattern; andselecting the one or more synchronization signals for transmission based on the indication.5.The method (500) according to any one of claims 1 to 4, further comprising indicating, to the receiving device, one or more sequences used to generate the one or more transmitted synchronization signals.6.The method (500) according to any one of claims 1 to 5, wherein the multiple resource blocks comprise overlapping resource blocks (221, 222) .7.The method (500) according to any one of claims 1 to 6, wherein the multiple resource blocks comprise non-overlapping resource blocks (211, 212) .8.A wireless communication method (600) applied to a receiving device, the method comprising:sending (601) an indication to a transmitting device, wherein the indication is indicative of one or more demanded resource blocks for receiving one or more synchronization signals; andreceiving (602) , from the transmitting device, the one or more synchronization signals using the one or more resource blocks in accordance with the indication.9.A wireless communication method (700) applied to a receiving device, the method comprising:receiving (701) an indication from a transmitting device, wherein the indication is indicative of one or more resource blocks carrying one or more synchronization signals; andreceiving (702) , from the transmitting device, the one or more synchronization signals using the one or more resource blocks based on the indication.10.The method according to claim 8 or 9, wherein in response to receiving two or more synchronization signals using two or more resource blocks, the method comprises:processing the two or more synchronization signals in a combined manner.11.A transmitting device (810) for wireless communication, the transmitting device (810) being configured to:generate multiple synchronization signals based on multiple sequences;map the multiple synchronization signals to multiple resource blocks; andtransmit one or more of the multiple synchronization signals to one or more receiving devices (820, 840, 860) using one or more of the multiple resource blocks.12.A receiving device (820, 840, 860) for wireless communication, the receiving device (820, 840, 860) being configured to:send an indication to a transmitting device, wherein the indication is indicative of one or more demanded resource blocks for receiving one or more synchronization signals; andreceive the one or more synchronization signals from the transmitting device using the one or more resource blocks in accordance with the indication.13.A receiving device (820, 840, 860) for wireless communication, the receiving device being configured to:receive an indication from a transmitting device, wherein the indication is indicative of one or more resource blocks carrying one or more synchronization signals; andreceive the one or more synchronization signals from the transmitting device using the one or more resource blocks based on the indication.14.A wireless communication system (800) comprising at least one transmitting device according to claim 11 (810) , and one or more receiving devices (820, 840, 860) according to claim 12 or 13.15.A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method according to any one of claims 1 to 10.
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