NR system supporting multi-bandwidth terminal access

Abstract

The invention relates to the technical field of mobile communication, and discloses an NR system supporting multi-bandwidth terminal access, which comprises a system message sending module used for an NR base station to send a system broadcast message, and a configuration module used for configuring an initial BWP of an NR base station cell, the terminal access module is used for processing random access of the NR terminal; and the dynamic configuration module is used for dynamically configuring the optimal BWP bandwidth for the NR terminal in real time according to the capability information carried by the NR terminal when the NR base station completes the random access process of the NR terminal, and completing BWP bandwidth updating through RRC reconfiguration. According to the invention, the BWP is dynamically configured in real time according to the terminal capability in the access process of the NR terminal so as to adapt to the NR terminals supported by different bandwidths, so that the NR terminal supporting any bandwidth can access the NR base station, the compatibility of the NR base station is stronger, the flexibility is improved, and the configuration complexity of the NR base station is reduced.

Description

Technical Field

[0001] The present invention relates to the field of mobile communication technologies, and in particular to a NR system supporting multi-bandwidth terminal access. Background Art

[0002] The mobile communication system includes two subsystems consisting of terminals, base stations, and core networks. The terminals and base stations constitute the base station subsystem, and the network elements within the core network constitute the network subsystem. In the base station subsystem, the interface between the terminal and the base station communicates through electromagnetic waves propagating in the air, so the interface between the terminal and the base station is called the "air interface". With the development of mobile communication technology, NR (New Radio) as a new wireless access technology is a global 5G (5th-Generation) technical standard with a new air interface design based on OFDM (Orthogonal Frequency Division Multiplexing).

[0003] As 5G is gradually commercialized around the world, more and more NR base stations are being built, and there are more and more NR terminal models. Different models of terminals support different bandwidths, which poses a great challenge to the adaptation of NR base stations to many categories of terminals. The compatibility of NR base stations needs to be improved urgently.

[0004] At present, in order to adapt to terminals with different bandwidths, NR base stations generally configure multiple different BWPs for the cell in advance. When the terminal accesses the NR base station, one of the pre-configured BWPs is selected as the active BWP of the NR terminal. This pre-configuration method is not flexible enough and the NR base station configuration is highly complex. Summary of the invention

[0005] The present invention intends to provide an NR system that supports multi-bandwidth terminal access. During the NR terminal access process, the BWP is dynamically configured in real time according to the terminal capability to adapt to NR terminals supported by different bandwidths, so that NR terminals supporting any bandwidth can access the NR base station, making the NR base station more compatible, increasing flexibility, and reducing the complexity of the NR base station configuration.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] An NR system supporting multi-bandwidth terminal access, comprising:

[0008] System message sending module, used for NR base station to send system broadcast messages;

[0009] A configuration module, used to configure the initial BWP of the NR base station cell;

[0010] Terminal access module, used to process random access of NR terminals;

[0011] The dynamic configuration module is used to dynamically and in real time configure the optimal BWP bandwidth for the NR terminal according to the capability information carried by the NR terminal during the random access process of the NR terminal by the NR base station, and complete the BWP bandwidth update through RRC reconfiguration.

[0012] The principle and advantages of this solution are: in actual application, the process of traditional NR terminal accessing the base station is: the NR base station sends SSB broadcast, the NR terminal parses MIB and SIB1 to complete downlink synchronization, the NR terminal and the NR base station complete uplink synchronization through the RA process, the NR terminal and the NR base station complete RRC establishment, and the RRC establishment process completes SRB establishment and initial BWP configuration. In the NR terminal access process, this solution dynamically configures the BWP supported by the terminal by detecting the BWP support information carried in the capability information reported by the NR terminal, thereby adapting to the access of the terminal supporting BWP. There is no need to configure the BWP information in advance, which has flexible, fast and convenient effects, and reduces the complexity of the BWP configuration of the NR base station. Compared with the prior art, this solution only configures the BWP supported by the NR terminal according to the capability information reported by the terminal during the NR terminal access process, does not increase or reduce the basic process of NR terminal access, does not need to configure BWP in the NR base station in advance, and can adapt to all NR terminals on the market.

[0013] Preferably, as an improvement, the initial BWP is the minimum bandwidth.

[0014] Technical effect: NR base stations only need to be configured with the minimum BWP defined in the 3GPP specification to accommodate access by all terminals.

[0015] Preferably, as an improvement, the NR base station sends a system broadcast message after the NR base station completes the connection between the NG and F1 interfaces and activates the cell.

[0016] Technical effect: Facilitates normal data transmission between the NR base station and the core network, and between the central unit and distributed units within the NR base station.

[0017] Preferably, as an improvement, the random access includes: after receiving the NR base station signal of the digital signal, the NR terminal detects and decodes the physical broadcast channel to obtain MIB and SIB1; the NR terminal sends the random access preamble Random Access Preamble through Msg1 to start the random access process; the NR base station parses the Msg1 of the NR terminal and replies with RAR; after the NR terminal decodes the RAR, it continues to send RRC Setup Request; after the NR base station decodes the RRC Setup Request, it allocates resources to the NR terminal and replies with RRC Setup; after receiving the RRC Setup, the NR terminal replies with RRC Setup Complete.

[0018] Technical effect: It can only utilize the random access process between NR terminals and does not require special processing procedures. It has good feasibility and lays the foundation for subsequent processing procedures.

[0019] Preferably, as an improvement, the dynamic real-time configuration of the optimal BWP bandwidth includes: the NR base station sends a UE capability query, and the NR terminal replies with UE capability information; the NR base station configures the final BWP for the UE according to the uplink and downlink bandwidth capabilities supportedBandwidthUL and supportedBandwidthDL of the UE capability information to complete the access process.

[0020] Technical effect: The BWP supported by the terminal is configured according to the capability information reported by the terminal, without increasing or reducing the basic process of NR terminal access, and there is no need to configure the BWP in the NR base station in advance, which is convenient and flexible.

[0021] Preferably, as an improvement, the UE capability information encapsulates supportedBandwidthUL, supportedBandwidthDL and the number of uplink and downlink supported BWPs.

[0022] Technical effect: It helps base stations better understand and utilize terminal capabilities, optimize resource allocation and link performance, and improve overall network efficiency and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an NR system supporting multi-bandwidth terminal access;

[0024] Figure 2 A schematic diagram of the frequency domain positions of BWP, carrier and cell in an NR system supporting multi-bandwidth terminal access;

[0025] Figure 3A schematic diagram of BWP configuration results of an NR system embodiment supporting multi-bandwidth terminal access;

[0026] Figure 4 A schematic diagram of BWP size in UE capability of an NR system embodiment supporting multi-bandwidth terminal access;

[0027] Figure 5 A schematic diagram of the number of BWPs in UE capabilities of an NR system embodiment supporting multi-bandwidth terminal access. DETAILED DESCRIPTION

[0028] The following is further described in detail through specific implementation methods:

[0029] The embodiment is basically as shown in the attached Figure 1 As shown:

[0030] An NR system supporting multi-bandwidth terminal access, comprising:

[0031] The system message sending module is used for the NR base station to send system broadcast messages, and the system broadcast information includes MIB and SIB1 messages. MIB contains the most basic system information, which is used for the terminal to initialize access to the network; MIB is transmitted through the physical broadcast channel (PBCH); MIB contains basic information such as system bandwidth, system frame number (SFN), physical layer cell ID (PCI), downlink configuration, etc. SIB1 contains more detailed system information for the terminal to further configure and access the network; SIB1 schedules information through the physical downlink control channel (PDCCH), and the terminal reads SIB1 from the physical downlink shared channel (PDSCH); SIB1 contains detailed information such as cell configuration (such as cell barring information, cell selection parameters), access control information (such as maximum transmission power, access preamble sequence configuration), common channels (such as Paging channel configuration, system information update period), other system information update periods (such as SIB2, SIB3 scheduling information).

[0032] The configuration module is used to configure the initial BWP of the NR base station cell. The initial BWP is the minimum bandwidth supported by NR. The NR base station only needs to configure the minimum BWP defined in the 3GPP specification to adapt to all terminal access.

[0033] A cell is a basic geographical unit in a wireless communication network. It is an area covered by one or more base stations (gNodeBs). A cell is responsible for managing the wireless resources in the area and providing wireless signal coverage and services. Each cell has a unique physical layer cell ID (PCI) to distinguish different cells.

[0034] The information element SCS-SpecificCarrier of ServingCellConfigCommon / ServingCellConfigCommonSIB defines the subcarrier spacing subcarrierSpacing of the cell, the offset offsetToCarrier relative to Point A, and the bandwidth size carrierBandwidth, which are public configurations. Point A is the common reference point of the source block raster (RE), and the frequency point is calculated through the SSB position and offsetToPointA (currently the default), or directly given by absoluteFrequencyPointA. The information element subcarrierSpacing in BWP defines the subcarrier spacing of BWP. locationAndBandwidth defines the start and length of BWP in RIV mode, where the start mapped to the CRB needs to be added with the offsetToCarrier of the cell bandwidth. BWP needs to be contained in the carrier, and the carrier needs to be contained in the cell. The frequency domain positions of the three are as follows: Figure 2 shown.

[0035] After completing the connection of the NG and F1 interfaces, the NR base station activates the cell and starts sending system broadcast messages. The NG interface is the interface between the 5GNR base station (gNodeB) and the 5G core network (5GC), which is used to transmit user plane data and control plane signaling. The F1 interface is the interface between the central unit (CU) and the distributed unit (DU) inside the 5G NR base station, which is used to transmit user plane data and control plane signaling. The NR base station configures cell parameters such as frequency band, bandwidth, subcarrier spacing, initial BWP, etc. through the F1 interface.

[0036] The terminal access module is used to process the random access of the NR terminal, including Msg1 to Msg5. The processing units include an RA processing unit, an SRB allocation unit and an RRC maintenance unit.

[0037] The RA processing unit is used for the terminal to select a random access preamble sequence and send it to the base station through the physical random access channel (PRACH). The RA processing unit of the base station detects the preamble sequence on the PRACH, determines which terminal has initiated a random access request, and allocates PUSCH resources to it through the RAR. The SRB allocation unit is used to allocate SRB resources to it after receiving the RRC Setup Request sent by the NR terminal. The SRB resources include PDCP configuration, RLC configuration, MAC configuration, etc. The RRC maintenance unit is used to establish an RRC connection entity and state management for the NR terminal.

[0038] Msg1 to Msg5 specifically include: after receiving the NR base station signal of the digital signal, the NR terminal detects and decodes the physical broadcast channel (PBCH) to obtain MIB and SIB1; Msg1: the NR terminal sends the random access preamble RandomAccess Preamble through Msg1 to request access to the network and start the random access process. Msg2: the NR base station parses the Msg1 of the NR terminal, and the base station sends a random access response (RAR) to the terminal to inform the terminal of the allocated uplink resources; Msg3: after the NR terminal decodes the RAR, it continues to send the RRC Setup Request. Msg4: after the NR base station decodes the RRC Setup Request, it allocates resources to the NR terminal, and the base station sends an RRC connection establishment message to indicate that the terminal connection has been established, and replies to RRC Setup. Msg5: after the NR terminal receives the RRC Setup, the terminal sends an RRC connection establishment completion message to confirm that the connection is established, and replies to RRC SetupComplete.

[0039] The dynamic configuration module is used to dynamically and real-time configure the optimal BWP bandwidth for the NR terminal according to the capability information carried by the NR terminal during the random access process of the NR terminal completed by the NR base station, so as to ensure that the NR terminal can perform uplink and downlink services within the BWP it supports; complete the BWP bandwidth update through RRC reconfiguration, and adapt to the access of NR terminals that support different bandwidths. Specifically, the NR base station sends a UE capability query; the NR terminal replies with the UE capability information; the NR base station configures the final BWP for it according to the uplink and downlink bandwidth capabilities supportedBandwidthUL and supportedBandwidthDL of the UE capability information, and completes the access process. The UE capability encapsulates supportedBandwidthUL, supportedBandwidthDL, and the number of uplink and downlink supported BWPs.

[0040] Take 20M and 40M bandwidth as an example: First, the cell configures an initial BWP and two dedicated BWPs. In order to prevent the public and dedicated PUCCH from interrupting the cell's 40M frequency band as much as possible, the 20M initial and dedicated BWPs try not to interrupt the 40M frequency band, and the PDCCH HCE of each BWP is aligned to 6RB. The initial BWP and the 20M dedicated BWP are configured at one end of the 40M, and the 20M is configured at the high frequency of 40M by default; secondly, the PDCCH, PUCCH, and SRS associated with BWP0, BWP1, and BWP2 are configured to ensure that they are all inside their respective BWPs; finally, the base station configures the initial BWP to BWP0 for the newly accessed\switched UE, and configures the corresponding BWP1 or BWP2 and the corresponding carrier in the RRC reconfiguration message according to the bandwidth capability supported by the UE. The results are shown in the figure below. Figure 3 As shown in the figure, the bandwidth size and number of BWP in UE capability are as follows Figure 4 and Figure 5 shown.

[0041] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An NR system supporting multi-bandwidth terminal access, characterized in that: include: System message sending module, used for NR base station to send system broadcast messages; A configuration module, used to configure the initial BWP of the NR base station cell; Terminal access module, used to process random access of NR terminals; The dynamic configuration module is used to dynamically and in real time configure the optimal BWP bandwidth for the NR terminal according to the capability information carried by the NR terminal during the random access process of the NR terminal by the NR base station, and complete the BWP bandwidth update through RRC reconfiguration.

2. The NR system supporting multi-bandwidth terminal access according to claim 1, characterized in that: The initial BWP is the minimum bandwidth.

3. The NR system supporting multi-bandwidth terminal access according to claim 2, characterized in that: The NR base station sends a system broadcast message after the NR base station completes the connection between the NG and F1 interfaces and activates the cell.

4. The NR system supporting multi-bandwidth terminal access according to claim 3, characterized in that: The random access includes: after receiving the NR base station signal of the digital signal, the NR terminal detects and decodes the physical broadcast channel to obtain MIB and SIB1; the NR terminal sends the random access preamble Random Access Preamble through Msg1 to start the random access process; the NR base station parses the Msg1 of the NR terminal and replies to RAR; after the NR terminal decodes the RAR, it continues to send RRC Setup Request; after the NR base station decodes the RRC Setup Request, it allocates resources to the NR terminal and replies to RRC Setup; after receiving RRCSetup, the NR terminal replies to RRC Setup Complete.

5. The NR system supporting multi-bandwidth terminal access according to claim 4, characterized in that: The dynamic real-time configuration of the optimal BWP bandwidth includes: the NR base station sends a UE capability query, and the NR terminal replies with UE capability information; the NR base station configures the final BWP for the UE according to the uplink and downlink bandwidth capabilities supportedBandwidthUL and supportedBandwidthDL of the UE capability information to complete the access process.

6. The NR system supporting multi-bandwidth terminal access according to claim 5, characterized in that: The UE capability information encapsulates supportedBandwidthUL, supportedBandwidthDL and the number of uplink and downlink supported BWPs.

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