CN110024463B

CN110024463B - Merging of remaining system information PDCCH

Info

Publication number: CN110024463B
Application number: CN201880003544.XA
Authority: CN
Inventors: 徐伟杰
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-11-28
Filing date: 2018-11-14
Publication date: 2020-09-01
Anticipated expiration: 2038-11-14
Also published as: TWI709354B; WO2019105232A1; CN110024463A; TW201927044A

Abstract

A method in a user equipment, UE, (100) of a wireless communication system (10) of combining a plurality of control information items received on a plurality of monitored resources of remaining minimum system information, RMSI, the method comprising: receiving a plurality of control information items, wherein each of the plurality of control information items corresponds to a different resource of the plurality of monitoring resources (230); and combining the plurality of control information items, wherein each of the plurality of control information items is transmitted using the same at least one transmission parameter.

Description

Merging of remaining system information PDCCH

Technical Field

Example aspects herein relate generally to the field of wireless access networks, and more particularly, to the communication of system information in a wireless access network. More particularly, example aspects herein relate to a method, User Equipment (UE), and radio base station (gNB) for merging a plurality of remaining system information (RMSI) PDCCHs transmitted in a radio access network.

Background

As a new fifth generation (new 5)^thgeneration, 5G) mobile communication standard, the third generation global partnership project (3GPP) is developing a 5G radio access technology, referred to as New Radio (NR). The 5G NR aims to solve various usage scenarios, from enhanced mobile broadband (eMBB) to ultra-reliable low-latency communications (URLC) to Massive Machine Type Communications (MMTC), and significantly improve the performance, flexibility, scalability, and efficiency of current mobile networks. The main NR features include ultra lean transmission (ultra lean transmission), support of low delay (latency), advanced antenna technology and spectral flexibility including operation in the high frequency band, and between the high and low frequency bandsInter-working, and dynamic time division multiplexing (TDD).

In order to access the 5G network, the UE must receive and decode System Information (SI) broadcast by a radio base station (gNB) of a cell in which the UE is located. In the final report of 3rd Generation partnership project Technical Specification Group Radio Access Network Working Group 2 conference #95, it is decided to divide the system information into "minimum system information" and "other system information" which are always broadcasted, which can be configured to be broadcasted or transmitted to the UE as needed. The minimum system information may be divided into a Master Information Block (MIB) and Remaining Minimum System Information (RMSI). It is agreed that the minimum system information includes at least information required by the UE to support cell selection, acquire further SI, and access the cell. More detailed information is provided in R1-1701519 "response to minimum system information LS (response LS on minimum system information)", RAN WG2, month 1 2017, and final report of conference #89 (section 7.1.1.2) of 3GPP TSG RAN WG 1.

Furthermore, as disclosed in 3GPP TSG RAN W1 conference 90bis R1-1717927, it has been agreed between 3GPP working groups that at least part of the minimum system information should be carried on the Public Broadcast Channel (PBCH). Due to the relative size of the minimum system information and the payload size of the PBCH, the PBCH carries only very basic system information. Thus, it is further agreed that the smallest system information part (about 200 bits) not carried on the NR-PBCH should be transmitted as the Remaining Minimum System Information (RMSI). The RMSI may include some or all of the Random Access Channel (RACH) configuration information as well as an indication of the actual transmitted Signal Synchronization (SS) block. It is suggested that in addition to the information provided by the NR-PBCH, the RMSI shall additionally include any other information that the UE needs in order to camp on the cell.

RMSI is carried by a Physical Downlink Shared Channel (PDSCH). More generally, the PDSCH is used to transmit Downlink (DL) user data, UE-specific higher layer information, system information, and paging. The PDSCH is scheduled using a Physical Downlink Control Channel (PDCCH) that is used to carry items of control information, such as downlink scheduling assignments and uplink scheduling grants. Since the RMSI is intended to be broadcast, all UEs in the cell should be able to decode the relevant control information items for the PDCCH bearer used for RMSI scheduling. Thus, the PDCCH for RMSI scheduling should be carried in a Common Search Space (CSS), i.e., one region in a downlink resource grid and a part of the entire PDCCH search space, where control information items common to all UEs can be carried.

The position in the CSS is provided in the form of a Control Channel Element (CCE) index. 5G/New Radio (5G/NR) introduces many New resource allocation units. A Resource Element (RE) is a minimum unit of a resource grid composed of one subcarrier in a frequency domain and one OFDM symbol in a time domain. A Resource Element Group (REG) is composed of one resource block (i.e., 12 resource elements in the frequency domain) and one OFDM symbol in the time domain. Finally, a Control Channel Element (CCE) consists of multiple REGs.

The transmission parameters for PDCCH for RMSI scheduling may include the following:

aggregation level: the aggregation level indicates how many Control Channel Elements (CCEs) are allocated for the PDCCH.

Control Resource Set (CORESET): CORESET consists of multiple resource blocks in the frequency domain and 1 to 3 OFDM symbols in the time domain. The PDCCH channel is limited to only one CORESET. Thus, CCE to REG mapping for CORESET may differ depending on aggregation level.

PDCCH candidates: each possible location in the downlink resource grid where a UE may find its PDCCH is called a candidate. All possible PDCCH candidates constitute a PDCCH search space. Each candidate corresponds to CORESET, and the location of the candidate is defined as a CCE index (CCE number to which PDCCH is assigned).

Search space: a region in the downlink resource grid that may carry one or more PDCCHs. The PDCCH for RMSI scheduling is carried in the Common Search Space (CSS) of the PDCCH search space. However, depending on the aggregation level, the common search space may have different candidates or a different number of candidates.

Transmission Slot Index (TSI): slot index within a frame. A slot comprises 14 OFDM symbols, the duration of which depends on the frequency.

Scheduling information of a PDCCH corresponding to a PDSCH carrying RMSI is also carried in PBCH in addition to the first part of the minimum system information. Therefore, a Master Information Block (MIB) carried by the PBCH includes parameters indicating the bandwidth of PDCCH/SIB (system information block), CORESET, common search space, and necessary PDCCH parameters, so that UEs in a cell can access control information items carried by the PDCCH, and thus the RMSI.

During DL transmission, blocks of the synchronization signal and the PBCH are packed into a single block and always transmitted together. This block is called a synchronization/PBCH (SS/PBCH) block. The SS/PBCH block is transmitted in periodic bursts (bursts).

As discussed in more detail in 3GPP TSG RAN W1 conference 90bis R1-1717032, some form of association is required between an SS/PBCH block providing scheduling information for a PDCCH and the corresponding RMSI CORESET for that PDCCH with scheduling information for the PDCCH carrying the RMSI, since there may not be enough time resources to transmit the RMSICORESET in the same time slot as the SS/PBCH block. Each SS/PBCH block may be associated with a set (multiple entries) of RMSI CORESET, i.e., multiple candidate locations in the DL resource grid, where a PDCCH may be carried, which carries scheduling information for the PDSCH carrying RMSI. When the UE successfully receives the PBCH in a particular SS/PBCH block, the UE will blindly detect (monitor) RMSIPDCCH in the relevant set of RMSICORESET indicated by the PBCH. The RMSI CORESET may be offset from the SS/PBCH block in the frequency domain.

Disclosure of Invention

[ problem ] to

Section 7.1.2.2 of the last recorded report of the 3GPP TSG RAN W1 conference 90bis has agreed to have a RMSI PDCCH monitoring window associated with the SS/PBCH block, which repeats periodically. The control information items carried on the PDCCH for scheduling RMSI and received by the UE may correspond to one or more particular respective monitoring windows. Further, each item of control information carried on the PDCCH for scheduling RMSI and received by the UE may correspond to a particular SS/PBCH block in the set of periodic SS/PBCH bursts. Further, each control information item carried on the PDCCH for scheduling the RMSI and received by the UE may correspond to a specific Transmission Time Interval (TTI).

The monitoring resource may be defined as an object indicating time or frequency resources in the DL resource grid, to which control information items carried on the PDCCH for scheduling the RMSI and received by the UE may correspond. The monitoring resources may include RMSI physical downlink control channel, PDCCH, monitoring window, RMSIPDCCH transmit time interval TTI, and/or synchronization signal physical broadcast channel (SS/PBCH) blocks within a SS/PBCH burst.

The inventors have realized that, based on the current protocol, items of control information transmitted on PDCCH for RMSI scheduling (RMSI PDCCH) corresponding to different monitored resources may be transmitted with different transmission parameters (by way of non-limiting example, different aggregation levels, different PDCCH candidates, or different search spaces). This difference in transmission parameters may be disadvantageous because RMSIPDCCH of different monitoring resources cannot be combined to improve RMSI PDCCH detection performance.

[ solution ]

In view of these limitations, the present inventors devised a method in a user equipment, UE, of a wireless communication system. The method comprises the following steps: receiving a plurality of control information items carried on respective PDCCHs used for scheduling Remaining Minimum System Information (RMSI), the PDCCHs being received on a plurality of monitoring resources, wherein at least two of the plurality of control information items correspond to different respective resources; and combining the plurality of control information items, wherein the plurality of control information items are transmitted using the same at least one transmission parameter.

The inventors have also devised a method in a radio base station, gbb, of a wireless communication system. The method comprises the following steps: transmitting a plurality of control information items on respective PDCCHs used for scheduling Remaining Minimum System Information (RMSI), the PDCCHs being transmitted on a plurality of monitoring resources, wherein at least two of the plurality of control information items correspond to different respective resources, wherein the plurality of control information items are transmitted using the same at least one transmission parameter.

The inventors have also devised a computer program comprising instructions that, when executed, cause a computer to perform the above-mentioned method.

The inventors also devised a non-transitory computer-readable storage medium storing the above-described computer program.

The inventors have also devised a signal carrying the above-mentioned computer program.

The inventors have also devised a corresponding user equipment, UE, as defined in independent claim 15 and a corresponding radio base station, gbb, as defined in claim 24.

Preferred embodiments are defined in the respective dependent claims.

Drawings

Reference will now be made in detail to the embodiments of the present invention, by way of non-limiting examples only, with reference to the accompanying drawings described below. The presence of the same reference numbers in different figures may indicate the same or functionally similar elements unless otherwise indicated.

Fig. 1 is a schematic diagram of a wireless communication system, according to an example aspect herein;

FIG. 2 is a schematic diagram illustrating monitoring resources and a plurality of items of control information, according to an example aspect herein;

fig. 3 is a diagram illustrating an example of an association between an SS/PBCH block providing scheduling information of a PDCCH and a corresponding RMSI core set of the PDCCH with scheduling information of a PDSCH carrying RMSI;

fig. 4 is a flow diagram illustrating a process by which the user equipment 100 of fig. 1 merges multiple control information items of the remaining minimum system information RMSI received on multiple monitored resources, according to an example aspect herein;

fig. 5 is a flow chart illustrating a process by which the wireless base station 200 of fig. 1 transmits a plurality of control information items of remaining minimum system information, RMSI, according to an example aspect herein;

fig. 6 is a block diagram illustrating an example signal processing hardware configuration of the user equipment 100 of fig. 1 according to an example embodiment herein;

fig. 7 is a block diagram illustrating an example signal processing hardware configuration of the radio base station 200 of fig. 1 according to an example embodiment herein.

Detailed Description

Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Where technical features in the drawings, detailed description or any claim are followed by reference signs, the reference signs have been included for the sole purpose of increasing the intelligibility of the drawings, detailed description, and claims. Accordingly, neither the reference numerals nor their absence have any limiting effect on the scope of any claim element.

[ first example embodiment ]

Fig. 1 is a schematic diagram of a wireless communication system 10 in accordance with an example aspect herein. The wireless communication system 10 includes a User Equipment (UE)100 and a radio base station 200. The UE100 performs wireless communication with the radio base station 200. In this embodiment, the radio base station 200 may be a 5G gbb (next generation NodeB). The radio base station 200 provides the UE100 in the cell 300 with access to the radio communication network, e.g. via beamforming. In the example shown in fig. 1, a radio base station 200 serves a single UE 100. However, in alternative embodiments, the radio base station 200 may provide service to a plurality of UEs.

To access the network, the UE100 may receive and decode System Information (SI) transmitted by the wireless base station 200, including in particular the RMSI broadcast by the wireless base station 200 on the PDSCH.

To receive the RMSI, the UE100 may receive and decode scheduling information of a PDCCH corresponding to a PDSCH carrying the RMSI. The scheduling information is transmitted on PBCH. The UE100 may also receive and decode the relevant control information items carried by the PDCCH for RMSI scheduling (RMSI PDCCH).

If the channel quality on the PDCCH is sufficiently high when the radio base station 200 transmits the control information items, the UE100 should be able to correctly receive and decode the control information items transmitted on the PDCCH by the radio base station 200. That is, by way of non-limiting example, the UE100 should correct any transmission error using an error correction code included by the radio base station 200 in the coding control information on the PDCCH.

However, if the channel quality is poor (e.g., due to interference), the UE100 may not be able to correct all transmission errors in the control information items transmitted on the PDCCH. In this case, the UE100 will not be able to correctly decode the control information item transmitted on the PDCCH, and thus, will not be able to receive the RMSI. In this way, the UE100 will be prevented from accessing the network.

However, although two given control information items received by the UE 200 cannot be independently decoded without error, the merging of two such control information items with transmission errors may provide enough information to allow the UE100 to correctly decode the control information items. More generally, many error correction methods rely on combining two or more instances of received information, e.g., control information items, in order to allow correct decoding of the received instances of information.

Accordingly, the UE may incorporate the control information items received at RMSI PDCCH to improve RMSIPDCCH detection performance.

As described above, the control information items received by the UE100 on the PDCCH and transmitted by the radio base station 200 correspond to (are associated with) the monitored resources. Fig. 2 is a schematic diagram illustrating a monitoring resource 230 and a plurality of items of control information according to an example aspect herein.

In this embodiment, the monitoring resource 230 may be RMSIPDCCH monitoring window 230 associated with the SS/PBCH block 210a, which periodically recurs. In the example of fig. 2, the UE receives, in the RMSICORESET 215, an item of control information carried on the PDCCH for scheduling RMSI. The items of control information, and thus the RMSI CORESET215, may correspond to one or more particular respective monitoring windows 230. In the example of fig. 2, each set of SS/PBCH block bursts 220 includes two SS/PBCH blocks 210. Alternatively, each set of SS/PBCH block bursts may include three or more SS/PBCH blocks.

Each monitoring window 230 may have a duration 235 of x consecutive time slots. For example, the duration 235 may be 1, 2, or 4 slots, and the value of x may be band-dependent and/or configured in the PBCH. In this embodiment, the start point of the monitoring window 230 may be temporally offset from the start point of the SS/PBCH block 210a by a predetermined value 240. Alternatively, the starting point of the monitoring window 230 may not be offset in time from the starting point of the SS/PBCH block 210 a.

In this embodiment, the period 245y of the monitoring window may be the same as the period 225 of the burst set of SS/PBCH blocks 220. Alternatively, the period 245 of the monitoring window may be different than the period 225 of the burst set of SS/PBCH blocks. The value y of the period 245 may be, for example, between 10ms and 160 ms. The value y of the period 245 may be any one of 10ms, 20ms, 40ms, 80ms, or 160 ms. The periodicity 245 may be band-dependent, configured in the PBCH, and/or dependent on the RMSI Transmission Time Interval (TTI). In general, a transmission time interval is the duration of time for which a data block is transmitted over a wireless link. Herein, the RMSI TTI for the downward selection may be 80ms or 160 ms.

As described above, the monitoring resource may be defined as an object indicating time or frequency resources in the DL resource grid, and the control information item carried on the PDCCH for scheduling the RMSI and received by the UE may correspond to the object. The monitoring resources 230 may include a RMSI physical downlink control channel, PDCCH, a monitoring window 230, RMSIPDCCH transmit time interval, TTI, and/or a synchronization signal physical broadcast channel (SS/PBCH) block 210 within the SS/PBCH burst 220.

That is, each item of control information carried on PDCCH and RMSI core 215 received by the UE may correspond to a particular respective monitoring window 230. Further, each item of control information carried on the PDCCH for scheduling RMSI and received by the UE may correspond to a particular one of the set of periodic SS/PBCH bursts 220, the SS/PBCH block 210. Further, each item of control information carried on the PDCCH used to schedule the RMSI and received by the UE may correspond to a particular Transmission Time Interval (TTI).

Furthermore, as described above, there may be some form of association between the SS/PBCH block 210a providing scheduling information for a PDCCH and the corresponding RMSICORESET 215 for that PDCCH with scheduling information (i.e., control information items) carrying the PDSCH of an RMSI. This may be needed when the time resources are not sufficient to allow the RMSICORESET 215 to transmit in the same time slot as the SS/PBCH block 210 a.

In the example of fig. 2, each SS/

PBCH block

210a, 210b, 210c, 210d is shown in association with a single RMSICORESET 215. However, each SS/PBCH block 210 may also be associated with a set of RMSICORESET (multiple RMSI CORESET entries) 215, i.e., multiple candidate locations in the DL resource grid that may carry PDCCH carrying scheduling information for PDSCH carrying RMSI. When the UE successfully receives the PBCH in a particular SS/PBCH block 210, the UE will blindly detect (monitor) RMSI PDCCH in the relevant set of RMSI CORESET215 indicated by the PBCH.

Fig. 3 is a diagram illustrating an example of an association between SS/PBCH blocks 210(210a-201c) providing scheduling information for a PDCCH and the corresponding RMSI core 215 of that PDCCH with scheduling information for PDSCH carrying RMSI. As shown in example (a) of fig. 3, the RMSI CORESET215 a may be offset from the SS/PBCH block 210a in the time and frequency domains. Alternatively, as shown in example (b) of fig. 3, the RMSI CORESET215 b may be offset from the SS/PBCH block 210b only in the time domain. Alternatively, as shown in example (c) of fig. 3, the RMSI CORESET215 b may be offset from the SS/PBCH block 210b only in the frequency domain.

In examples (a) - (c) shown in fig. 3, there is a one-to-one association between each SS/PBCH block 210 and the corresponding RMSICORESET 220. Alternatively, there may be many-to-one associations between multiple SS/PBCH blocks 210 and a single corresponding RMSI CORESET 220. From the perspective of the UE100, such many-to-one association may appear as a one-to-one association between the SS/PBCH block 210 and the corresponding RMSI core set 220. By further alternative, there may be a one-to-many association between a single SS/PBCH block 210 and a plurality of corresponding RMSI CORESET 220.

The inventors have realized that, based on the current protocol, items of control information transmitted on PDCCH for RMSI scheduling (RMSIPDCCH) corresponding to different monitored resources may be transmitted with different transmission parameters. That is, the transmission parameters may be different between control information items associated with different monitoring windows and/or between control information items associated with different SS/PBCH blocks in the periodic SS/PBCH burst set and/or between different transmission time intervals.

In general, these parameters may relate to the following: resources in the resource grid (in terms of frequency and time) are allocated for transmission on the PDCCH. By way of non-limiting example, the transmission parameters for PDCCH for RMSI scheduling may include the following:

aggregation level

PDCCH candidates

Search space

Controlling resource set (CORESET)

Index of transmission slot

Such differences in transmission parameters may be disadvantageous because it may not be possible to combine control information items transmitted using different transmission parameters, or combining control information items transmitted using different transmission parameters may require excessive time or processing resources on behalf of the UE 100. Such items of control information received on different monitoring resources cannot be combined to improve RMSI PDCCH detection performance.

Fig. 4 is a flow diagram illustrating a process by which the user equipment 100 of fig. 1 merges multiple control information items of the remaining minimum system information RMSI received on multiple monitored resources, according to an example aspect herein.

In process S10, the UE100 receives a plurality of control information items, wherein each of the plurality of control information items corresponds to a different resource on the plurality of monitored resources 230.

Each of the plurality of control information items is transmitted using the same at least one transmission parameter. That is, each received control information item may be transmitted with the same transmission parameter, and for each of the plurality of monitoring resources 230, at least one of the same transmission parameters of the corresponding control information item has the same value. For example, the first RMSI PDCCH in the first monitoring window and the second RMSI PDCCH in the (subsequent) second monitoring window are transmitted by using the same transmission parameters (e.g., the same CORESET), which allows for improved detection performance by merging the respective two items of control information used for scheduling the RMSI.

By way of further example, the at least one transmission parameter may be an aggregation level, and for each monitoring resource 230 of the plurality of monitoring resources, the aggregation level of the RMSI scheduled PDCCH that received the respective control information item may be 8.

In this embodiment, the at least one transmission parameter may include a plurality of transmission parameters. In the present embodiment, the plurality of transmission parameters may include an aggregation level, PDCCH candidates, a search space, RMSI PDCCH control resource set, CORESET, and a transmission slot index.

Optionally, in this embodiment, the UE100 may receive a value indicating whether the same at least one transmission parameter is used. In this embodiment, the value may be a single bit value received on the physical broadcast channel PBCH.

That is, in this embodiment, the UE may receive on the PBCH an indication of whether RMSI PDCCH of different RMSI PDCCH monitoring windows and/or RMSI PDCCH of transmission parameters corresponding to different TTIs and/or RMSIPDCCH of different SS/PBCH blocks in one set of SS/PBCH bursts are used. These parameters include at least an aggregation level and/or PDCCH candidates and/or search space and/or RMSI pdcchcarrier and/or transmission slot index.

In this embodiment, the indication may be provided to the UE as a single bit in the PBCH payload. If the value of this bit is set to "1," then the exact same (i.e., exact same) transmit parameters are used for RMSI PDCCH for different RMSI PDCCH monitoring windows and/or RMSI PDCCH for different TTIs and/or RMSIPDCCH corresponding to different SS/PBCH blocks in one set of SS/PBCH bursts. In this case, the UE may perform PDCCH combining between different RMSI PDCCH for different monitoring windows and/or different TTIs corresponding to different SS/PBCH blocks in one set of SS/PBCH bursts and/or RMSIPDCCH of RMSI PDCCH, as described above.

Otherwise, if the value of this bit is set to "0", then different transmit parameters are used for RMSIPDCCH for different monitoring windows and/or RMSI PDCCH for different TTIs and/or RMSI PDCCH corresponding to different SS/PBCH blocks in one set of SS/PBCH bursts. In this case, the UE may not perform PDCCH combining between different RMSI PDCCH for different monitoring windows and/or different TTIs corresponding to different SS/PBCH blocks in one set of SS/PBCH bursts and/or RMSI PDCCH of RMSI PDCCH.

Thus, the UE100 receiving a value indicating whether the same at least one transmission parameter is used may allow the UE100 to incorporate multiple items of control information in certain situations while maintaining flexibility in transmission parameter selection, since the UE100 may be signaled regardless of whether the same at least one transmission parameter is used.

In an alternative embodiment, the value of each of the at least one transmission parameter may be set to a respective predetermined value for all monitored resources.

For example, it is specified in the specification that the transmission parameters of RMSI PDCCH of different RMSI PDCCH monitoring windows and/or of RMSI PDCCH of different TTIs and/or RMSIPDCCH corresponding to different SS/PBCH blocks in one set of SS/PBCH bursts use the same transmission parameters, e.g., the same aggregation level and/or the same PDCCH candidate and/or the same search space and/or the same RMSI PDCCH CORESET and/or the same transmission slot index. In this way, the UE may be guaranteed to perform PDCCH combining between different RMSI PDCCH for different monitoring windows and/or different TTIs corresponding to different SS/PBCH blocks in one set of SS/PBCH bursts and/or RMSI PDCCH of RMSI PDCCH, as described above.

In the process S12 of fig. 4, the UE merges a plurality of control information items. As described above, by combining a plurality of control information items corresponding to a plurality of monitoring resources, the UE can improve RMSI PDCCH detection performance.

[ second example embodiment ]

Fig. 5 is a flow chart illustrating a process by which the wireless base station 200 of fig. 1 transmits a plurality of control information items for the remaining minimum system information RMSI, according to an example aspect herein.

In the process S20 of fig. 5, the radio base station 200 sets the same at least one transmission parameter for each of the plurality of control information items to be transmitted so that the plurality of control information items can be combined.

That is, each control information item to be transmitted may have at least one transmission parameter that is the same transmission parameter and has the same value for all control information items to be transmitted. By way of non-limiting example, the at least one parameter may be an aggregation level, and the aggregation level may be set to 8 for a control information item of the plurality of control information items to be transmitted. The at least one transmission parameter may be, for example, any one of: an aggregation level; PDCCH candidates; searching a space; RMSI PDCCH control the resource set; CORESET; and transmitting the slot index.

In this embodiment, the at least one transmission parameter may include a plurality of transmission parameters. The plurality of transmission parameters may include an aggregation level, PDCCH candidates, search space, RMSI PDCCH control resource set, CORESET, and transmission slot index.

In the present embodiment, the radio base station 200 may set the same at least one transmission parameter for each of the plurality of control information items transmitted only for some of the plurality of control information items to be transmitted. The plurality of control information items to be transmitted for which the radio base station performs procedure S20 may be determined by the radio base station 200 based on, for example, the respective capabilities of the UEs (including UE 100) in the cell 300 and to which the radio base station 200 provides network access or on network traffic.

The radio base station 200 may set a different value for at least one same transmission parameter of different plurality of control information items to be transmitted, the value of the at least one transmission parameter being the same for each of the given plurality of control information items to be transmitted.

In this case, in the present embodiment, the radio base station 200 can transmit a value indicating whether the same at least one transmission parameter is used. In the present embodiment, the radio base station 200 may transmit the value before transmitting the plurality of control information items to be transmitted. Alternatively, the radio base station 200 may transmit the value at the same time as transmitting the plurality of control information.

Similar to the discussion above regarding the UE100, the value transmitted by the radio base station 200 may be a single-bit value transmitted on the physical broadcast channel PBCH.

In an alternative embodiment, the value of each of the at least one transmission parameter may be set to a respective predetermined value for all monitoring resources 230. For example, it may be specified in the specification that the transmission parameters of RMSI PDCCH use the same transmission parameters, e.g. the same aggregation level and/or the same PDCCH candidate and/or the same search space and/or the same RMSI PDCCH CORESET and/or the same transmission slot index.

In procedure S22 of fig. 3, the radio base station 200 transmits a plurality of control information items for the remaining minimum system information RMSI to be received on the plurality of monitoring resources 230.

In this embodiment, a plurality of control information items may be transmitted on a physical downlink control channel, PDCCH. The radio base station 200 may transmit a plurality of control information items to one or more UEs (including the UE 100) in the cell 300 and which the radio base station 200 provides service.

The radio base station 200 transmits each of the plurality of control information items using the same at least one transmission parameter so that one or more UEs receiving the plurality of control information items can combine the plurality of control information items.

Fig. 6 is a block diagram illustrating an example signal processing hardware configuration 600 of the user equipment 100 of fig. 1 according to an example embodiment herein. In the present embodiment, the programmable signal processing hardware 600 of fig. 6 may be configured to function as the UE100 of fig. 1. It should be noted, however, that apparatus 600 may alternatively be implemented in non-programmable hardware (e.g., an Application Specific Integrated Circuit (ASIC)) or in any other suitable manner using any suitable combination of hardware and software components such that the UE includes processing and communication functions required to operate in accordance with one or more conventional telecommunications standards including, but not limited to, GSM, PCS, 3GPP, LTE-A, UMTS, 3G, 4G, 5G.

Programmable signal processing hardware 600 includes a transmit/receive section 610 and one or more antennas 605. The signal processing apparatus 600 further comprises a control section (e.g., a processor, such as a central processing unit CPU or a graphics processing unit GPU)620, a working memory 630 (e.g., a random access memory) and an instruction memory 640 storing computer readable instructions that, when executed by the control section 620, cause the processor 620 to perform the functions of the UE of fig. 1.

The instruction memory 640 may comprise ROM (e.g., in the form of Electrically Erasable Programmable Read Only Memory (EEPROM) or flash memory) that is preloaded with computer-readable instructions. Alternatively, the instruction memory 640 may comprise RAM or a similar type of memory, and computer-readable instructions of a computer program may be input thereto from a computer program product, e.g., a non-transitory computer-readable storage medium 650 in the form of a CD-ROM, DVD-ROM, or the like, or a computer-readable signal 660 carrying computer-readable instructions.

Fig. 7 is a block diagram illustrating an example signal processing hardware configuration 700 of the radio base station 200 of fig. 1 according to an example embodiment herein. As in the present exemplary embodiment, the programmable signal processing hardware 700 of fig. 4 may be configured for use as the radio base station 200 of fig. 1. It should be noted, however, that the apparatus 700 may alternatively be implemented in non-programmable hardware (e.g., an Application Specific Integrated Circuit (ASIC)) or in any other suitable manner using any suitable combination of hardware and software components such that the wireless base station includes the processing and communication functions required to operate in accordance with one or more conventional telecommunications standards, including but not limited to GSM, PCS, 3GPP, LTE-A, UMTS, 3G, 4G, 5G.

The programmable signal processing hardware 700 includes a transmit/receive portion 710 and one or more antennas 705. The signal processing device 700 further comprises a network communication interface 715, a control section (for example, a processor, such as a central processing unit CPU or a graphics processing unit GPU)720, a working memory 730 (for example, a random access memory) and an instruction memory 740 storing computer-readable instructions which, when executed by the control section 720, cause the processor 720 to perform the functions of the radio base station 200 of fig. 1.

The instruction memory 740 may include ROM (e.g., in the form of Electrically Erasable Programmable Read Only Memory (EEPROM) or flash memory) that is preloaded with computer-readable instructions. Alternatively, instruction memory 740 may comprise RAM or a similar type of memory, and computer-readable instructions of a computer program may be input thereto from a computer program product, e.g., a non-transitory computer-readable storage medium 750 in the form of a CD-ROM, DVD-ROM, or the like, or a computer-readable signal 760 carrying computer-readable instructions.

Claims

1. A method in a user equipment, UE, (100) of a wireless communication system (10), the method comprising:

receiving (S10) a plurality of control information items carried on respective PDCCHs used for scheduling Remaining Minimum System Information (RMSI), the PDCCHs being received on a plurality of monitoring resources (230), wherein at least two of the plurality of control information items correspond to different monitoring resources (230); and

merging (S12) the plurality of control information items,

wherein the plurality of control information items are transmitted using the same plurality of transmission parameters; the plurality of transmission parameters includes PDCCH candidates and RMSI PDCCH control resource sets, and at least one of: aggregation level, search space, transmit slot index.

2. The method of claim 1, wherein the plurality of monitoring resources comprises at least two of:

the RMSI physical downlink control channel PDCCH monitoring window,

RMSI PDCCH Transmission time Interval, TTI, an

SS/PBCH blocks in a synchronization signal physical broadcast channel SS/PBCH burst.

3. The method of any of claims 1-2, further comprising:

receiving a value indicating whether to use the same plurality of transmission parameters.

4. The method of claim 3, further comprising:

in the case where the same plurality of transmission parameters are used, a plurality of control information items are merged.

5. The method of claim 4, wherein the value is a single bit value received on a Physical Broadcast Channel (PBCH).

6. The method according to any of claims 1-2, wherein the values of the plurality of transmission parameters are set to respective predetermined values for all monitored resources.

7. A method in a radio base station, gbb, (200) of a wireless communication system (10), comprising:

transmitting (S22) a plurality of control information items on respective PDCCHs used for scheduling Remaining Minimum System Information (RMSI), the PDCCHs being transmitted on a plurality of monitoring resources (230), wherein at least two control information items of the plurality of control information items correspond to different monitoring resources (230),

8. The method of claim 7, further comprising transmitting a value indicating whether to use the same plurality of transmission parameters.

9. A non-transitory computer-readable storage medium storing a computer program that causes a computer to perform the method of any one of claims 1 to 6.

10. A user equipment, UE, (100) for a wireless communication system (10), comprising:

a receiving part (610) configured to receive a plurality of control information items carried on respective PDCCHs used for scheduling Remaining Minimum System Information (RMSI), the PDCCHs being received on a plurality of monitoring resources (230), wherein at least two control information items of the plurality of control information items correspond to different monitoring resources (230); and

a control section (620) configured to merge the plurality of control information items,

11. The user equipment (100) of claim 10, wherein the plurality of monitoring resources (230) comprises at least two of:

the RMSI physical downlink control channel PDCCH monitoring window,

RMSI PDCCH Transmission time Interval, TTI, an

12. The user equipment (100) according to any of claims 10-11, wherein the receiving part (610) is further configured to receive a value indicating whether to use the same plurality of transmission parameters.

13. The user equipment (100) according to claim 12, wherein the control section (620) is further configured to merge the plurality of control information items only if the same plurality of transmission parameters are used.

14. The user equipment (100) according to claim 13, wherein the value is a single bit value received on a physical broadcast channel, PBCH.

15. The user equipment (100) according to any of claims 10-11, wherein the value of each of the plurality of transmission parameters is set to a respective predetermined value for all monitored resources.

16. A user equipment, UE, comprising:

a memory (640); and

a processor (620) for performing a plurality of operations,

wherein the memory (640) stores one or more computer programs that, when executed by the processor (620), cause the processor (620) to perform the method according to any one of claims 1 to 6.

17. A radio base station, gbb, (200) for a wireless communication system (10), comprising:

a transmitting part (710) configured to transmit a plurality of control information items on respective PDCCHs used for scheduling Remaining Minimum System Information (RMSI), the PDCCHs being transmitted on a plurality of monitoring resources (230), wherein at least two control information items of the plurality of control information items correspond to different monitoring resources (230),

18. The radio base station (200) according to claim 17, wherein the transmitting part (710) is further configured to transmit a value indicating whether the same plurality of transmission parameters are used.

19. A radio base station, gbb, comprising:

a memory; and

a processor for processing the received data, wherein the processor is used for processing the received data,

wherein the memory stores one or more computer programs that, when executed by the processor, cause the processor to perform the method according to any one of claims 7 to 8.