CN116567673B - Optimization method and device for access network of RedCAP terminal - Google Patents
Optimization method and device for access network of RedCAP terminal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The invention discloses a method and a device for optimizing access network of a RedCAP terminal. If NCD-SSB information is not issued in the SIB and the bandwidth range of the independent initial downlink BWP does not contain CD-SSB completely or does not contain CD-SSB completely, the RedCAP terminal finds out GSCN in the bandwidth range of the independent initial downlink BWP and then performs relevant synchronization of PSS and SSS on the NCD-SSB signal in the GSCN; after the PBCH decoding is successful, the current target frequency point is considered to have a real NCD-SSB signal. And then judging whether the NCD-SSB signal is credible or not, and when the NCD-SSB signal is credible, taking the channel estimation result of the NCD-SSB signal as a reference to evaluate the channel quality and correct the channel quality. The invention acquires NCD-SSB information in advance and optimizes the random access flow of the RedCAP terminal before the network access of the RedCAP terminal is successful.
Description
Technical Field
The present invention relates to a mobile communication technology, and in particular, to a method for accessing a 5G NR (new radio) network by a RedCap (Reduced Capability) terminal.
Background
The RedCap terminal is introduced in the 3gpp Release 17 standard. The RedCap terminal reduces complexity by reducing terminal air interface capabilities, such as antenna capabilities, system bandwidth, peak rate, etc., to meet the requirements for reducing terminal cost, size, and power consumption. In other words, redCap is a lightweight, low cost, low power consumption 5G terminal technology.
BWP (Bandwidth Part) is a subset or Part of the total carrier Bandwidth (carrier Bandwidth) of a cell, where initial BWP is used for UE (user equipment, i.e. terminal) access to the cell, etc. In the 3gpp Release 17 version of the 5G NR related protocol, the initial BWP related parameters are as follows.
The first is the common initial uplink and downlink BWP, which is a local cell-based uplink and downlink initial BWP parameter carried by the network in SIB1 (System Information Block Type, system information block type one), such as bandwidth, location of BWP, and detailed uplink and downlink resource allocation, for the whole UE. The parameter can ensure the basic uplink and downlink interactive resource allocation between the UE and the network, so that the UE can complete a complete random access flow.
The second is independent initial uplink and downlink BWP, which is an uplink configuration common v1700 (also called independent initial uplink BWP) and an initial downlink BWP-Redcap-r17 (initial downlink BWP-Redcap-r17, also called independent initial downlink BWP) carried by the network in SIB1, specifically for the Redcap terminal. There is no independent initial upstream-downstream BWP in the 3gpp Release 15, 3gpp Release 16 version of the protocol.
The common initial upstream-downstream BWP and the independent initial upstream-downstream BWP are completely independent and may overlap completely, partially or not overlap completely in frequency. If the two are completely non-overlapping in frequency, the data of the normal terminal (i.e., the non-RedCap terminal) and the RedCap terminal can be prevented from interfering with each other. Generally, if the network is configured with an independent initial uplink and downlink BWP, and the physical resource configuration therein can satisfy the requirement that the RedCap terminal access the network, the RedCap terminal preferably uses the independent initial uplink and downlink BWP access network; otherwise, the RedCAP terminal selects a public initial uplink and downlink BWP access network.
The third is an initial BWP specific parameter, which is a specific parameter configured by the network for a specific UE in signaling such as RRC Setup, RRC Resume, RRC Reestablishment (RRC reestablish), RRC Reconfiguration (RRC reconfiguration), etc., only for a specific terminal. This parameter does not modify the basic parameters such as bandwidth of BWP, but new physical resources can be configured incrementally or overridden.
In general, parameters that the network configures to the UE are roughly divided into two categories-Common (Common) and dedicated (dedicated). The generic parameters are typically common parameters of the network broadcast, e.g. the common initial upstream-downstream BWP and the independent initial upstream-downstream BWP both belong to the initial BWP generic parameters. The dedicated parameter, also called UE-specific (UE-specific) parameter, is a specific private parameter issued by the network for a single UE. The configuration information carried by the general parameters is limited, and the special parameters are complements of the general parameters. For example SR (schedule request) resources can only be issued in BWP specific parameters.
The RedCap terminal needs to select a reference signal according to the frequency domain range of the initial BWP general parameter and perform a random access procedure according to the need. After the random access is completed, if the initial BWP specific parameter indication carried by the network is not clear enough, the RedCap terminal may not perform uplink and downlink synchronization with the network better.
If the network configures initial BWP-specific parameters for a specific UE in RRC Setup or the like signaling. It is determined that the initial BWP specific parameters are used to update the common initial upstream-downstream BWP. The updating means that: the special parameters are used as the supplement of the general parameters; if a certain part of the dedicated parameters and a certain part of the generic parameters functionally overlap, the dedicated parameters of that part are preferentially used. However, the present protocol does not explicitly specify that the initial BWP specific parameters can be used to update the independent initial uplink and downlink BWP, and it is often not explicitly specified in the signaling, so that the understanding and processing manners of different UEs are not identical. If the UE understands that the initial BWP-specific parameters cannot be used to update the independent initial uplink and downlink BWP, the UE may not find the resource transmission SR.
NCD-SSB (non Cell Defining SSB, non-cell-defined SSB) was also introduced in the 3gpp Release 17 protocol. Wherein SSB represents a synchronization signal block (synchronization signal block). The current protocol specifies that the network can configure specific frequency point information of the NCD-SSB in RRC Setup and other signaling only after the UE completes random access. But before the UE completes the random access, an NCD-SSB signal is possible. Before the UE receives the RRC Setup signaling, the UE cannot acquire the frequency point information of the NCD-SSB through the signaling even though the NCD-SSB exists.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to make the UE acquire the frequency point information of NCD-SSB in advance (i.e. before the UE receives the signaling of RRC Setup and the like), thereby helping the UE to improve the success rate of accessing the network under the high-interference and weak-signal scene.
In order to solve the technical problems, the invention provides an optimization method for accessing a RedCAP terminal to a network, which comprises the following steps. Step S1: the network side chooses whether to configure the independent initial downlink bandwidth part BWP in a system information block type-SIB 1 message and whether to issue non-cell definition synchronization signal block NCD-SSB information in an existing or newly added SIB message. Step S2: the RedCap terminal reads system information of a 5G NR cell suitable for camping, including a master information block MIB, SIB1, and SIB for carrying NCD-SSB information. If no independent initial downlink BWP is configured in SIB1, the RedCAP terminal performs random access flow according to the current protocol. If the independent initial downlink BWP is configured in the SIB1, continuing to judge: if NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP completely contains NCD-SSB, the step S3 is entered; if NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP is not completely or completely contained, proceeding to step S7; if no NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP is not fully contained or does not contain the cell definition synchronization signal block CD-SSB at all, proceeding to step S4; if no NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP completely contains the CD-SSB, step S7 is entered. Step S3: the RedCAP terminal performs periodic measurement and correlation estimation on the NCD-SSB signal according to the NCD-SSB information to obtain a channel estimation result of the NCD-SSB signal; the method comprises the steps of carrying out channel estimation on a physical broadcast channel demodulation reference signal (PBCH DMRS) in an NCD-SSB signal and obtaining MIB after decoding PBCH data; then step S5 is entered. Step S4: the RedCAP terminal finds out a global synchronization channel number GSCN in the bandwidth range of an independent initial downlink BWP, then carries out relevant synchronization of a primary synchronization signal PSS and a secondary synchronization signal SSS on an NCD-SSB signal in the GSCN, and tries to carry out PBCH decoding on the NCD-SSB signal after success; after the PBCH decoding is successful, the RedCap terminal considers that a real NCD-SSB signal exists in the current target frequency point, and also obtains a channel estimation result of the NCD-SSB signal, and then proceeds to step S5. Step S5: judging whether the NCD-SSB signal is credible or not according to a channel estimation result of the NCD-SSB signal; if the NCD-SSB signal is considered to be authentic, proceeding to step S6; otherwise, step S7 is entered. Step S6: the RedCAP terminal evaluates the channel quality and corrects it by taking the channel estimation result of the NCD-SSB signal as a reference. Step S7: the RedCap terminal evaluates the channel quality and makes corrections with reference to the channel estimation result of the CD-SSB signal.
Further, in the step S1, the network side carries the NCD-SSB information in any one or more SIBs in the prior art, or the network side adds an SIB message for issuing the NCD-SSB information; the NCD-SSB information includes: one or more of an absolute radio frequency channel number ARFCN of the NCD-SSB center frequency point, a period of the NCD-SSB, and an offset of the NCD-SSB relative to the CD-SSB.
Further, in the step S4, if the relevant synchronization of PSS or SSS to the NCD-SSB signal by the RedCap terminal at the GSCN fails, or the PBCH decoding of the NCD-SSB signal is failed, the NCD-SSB signal is considered to be not trusted, and then step S7 is performed.
Further, in the step S5, when the SNR of the DMRS estimation of the NCD-SSB signal is greater than or equal to a specific threshold, or the physical cell ID recorded in the NCD-SSB signal is the same as the physical cell ID recorded in the CD-SSB signal, or the system frame number and subcarrier spacing in the MIB in the NCD-SSB signal are the same as the content of the system frame number and subcarrier spacing in the MIB in the CD-SSB signal, the RedCap terminal considers the NCD-SSB signal to be authentic; otherwise the RedCap terminal considers the NCD-SSB signal not authentic.
Further, the step S6 specifically includes: the RedCAP terminal takes the channel estimation result of the NCD-SSB signal as a reference, corrects possible time deviation or frequency deviation between the RedCAP terminal and a network, adjusts downlink reception according to signal strength, and also takes the channel estimation result of the NCD-SSB signal as a reference for blind detection of Physical Downlink Control Channel (PDCCH) information; and then the RedCAP terminal performs a random access flow according to the current communication protocol.
Further, the step S7 specifically includes: the RedCAP terminal takes the channel estimation result of the CD-SSB signal as a reference, corrects possible time deviation or frequency deviation between the RedCAP terminal and a network, adjusts downlink reception according to signal strength, and takes the channel estimation result of the CD-SSB signal as a reference for blind detection of Physical Downlink Control Channel (PDCCH) information; and then the RedCAP terminal performs a random access flow according to the current communication protocol.
Further, the steps S6 and S7 are followed by the following steps. Step S8: after the RedCap terminal is accessed to the network, the initial BWP special parameter is obtained from the signaling issued by the network side; if the network side explicitly indicates that the initial BWP specific parameter is used to update the independent initial uplink and downlink BWP in the signaling, then step S9 is entered; otherwise, the process advances to step S10. Step S9: the RedCAP terminal updates independent initial uplink and downlink BWP according to the initial BWP special parameter; the updating means that: the respective parameters are used when the initial BWP-specific parameter and the independent initial upstream-downstream BWP are not overlapped, and the initial BWP-specific parameter is preferentially used when the initial BWP-specific parameter and the independent initial upstream-downstream BWP are overlapped. Step S10: if the signaling issued by the network side carries the non-initial BWP and designates the non-initial BWP as the priority activated BWP, the RedCAP terminal selects the BWP and updates the parameters according to the priority activated BWP issued by the network side; otherwise, the RedCap terminal updates the independent initial uplink and downlink BWP according to the initial BWP special parameter issued by the network side.
Further, in the step S8, the explicit indication includes any one of the following two manners; mode one: the network side increases the parameters of the level of the independent initial uplink and downlink BWP in the service cell configuration SeringCellConfig carrying the signaling of the initial BWP special parameters; mode two: explicit description is added in the communication protocol to update the independent initial upstream and downstream BWP with the configuration of the initial BWP specific parameters.
The invention also provides an optimizing device of the access network of the RedCAP terminal, which comprises a network configuration unit, a system message reading unit, an NCD-SSB measurement estimation unit, an NCD-SSB search decoding unit, an NCD-SSB trusted judgment unit, a first correction unit and a second correction unit. The network configuration unit is configured to select whether to configure the independent initial downlink bandwidth part BWP in a SIB1 message of a system information block type, and to select whether to issue non-cell definition synchronization signal block NCD-SSB information in an existing or a newly added SIB message. The system message reading unit is used for reading system information of a 5G NR cell suitable for residence, and comprises a master information block MIB, a SIB1 and a SIB used for carrying NCD-SSB information; if no independent initial downlink BWP is configured in the SIB1, the RedCAP terminal performs a random access flow according to the current communication protocol; if the independent initial downlink BWP is configured in the SIB1, continuing to judge: if NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP completely contains NCD-SSB, then subsequently entering an NCD-SSB measurement estimation unit; if NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP is not completely contained or does not contain NCD-SSB at all, then a second correction unit is subsequently entered; if NCD-SSB information is not issued in the SIB and the bandwidth range of the independent initial downlink BWP is not completely contained or does not contain the cell definition synchronization signal block CD-SSB at all, then the method subsequently enters a NCD-SSB search decoding unit; if NCD-SSB information is not issued in the SIB and the bandwidth range of the independent initial downlink BWP completely contains CD-SSB, then a second correction unit is entered subsequently. The NCD-SSB measurement estimation unit is used for periodically measuring and correlatively estimating the NCD-SSB signal according to the NCD-SSB information to obtain a channel estimation result of the NCD-SSB signal, wherein the channel estimation result comprises MIB obtained after channel estimation of a physical broadcast channel demodulation reference signal PBCH DMRS in the NCD-SSB signal and decoding of PBCH data; then the NCD-SSB trusted judgment unit is entered. The NCD-SSB searching and decoding unit is used for finding out GSCN in the bandwidth range of the independent initial downlink BWP, then performing PSS and SSS related synchronization on the NCD-SSB signal in the GSCN, and attempting PBCH decoding on the NCD-SSB signal after success; when PBCH decoding is successful, the current target frequency point is considered to have a real NCD-SSB signal, and a channel estimation result of the NCD-SSB signal is also obtained, and then the NCD-SSB signal enters a NCD-SSB trusted judgment unit. The NCD-SSB credibility judging unit is used for judging whether the NCD-SSB signals obtained by the NCD-SSB measurement estimating unit and the NCD-SSB searching and decoding unit are credible or not; if the first correction unit is trusted, subsequently entering the first correction unit; otherwise, the second correction unit is entered. The first correction unit evaluates the channel quality according to the channel estimation result of the NCD-SSB signal and corrects the channel quality. The second correction unit evaluates the channel quality and corrects the channel quality according to the channel estimation result of the CD-SSB signal.
Further, the optimizing device of the access network of the RedCap terminal further comprises a special parameter obtaining unit, a first updating unit and a second updating unit. The special parameter obtaining unit is used for obtaining the initial BWP special parameter from the signaling issued by the network side; if the network side explicitly indicates that the initial BWP special parameter is used for updating the independent initial uplink and downlink BWP, then the first updating unit is subsequently entered; otherwise, the second updating unit is subsequently entered. The first updating unit is configured to update the independent initial uplink and downlink BWP according to the initial BWP specific parameter issued by the network side; the updating means that: the respective parameters are used when the initial BWP-specific parameter and the independent initial upstream-downstream BWP are not overlapped, and the initial BWP-specific parameter is preferentially used when the initial BWP-specific parameter and the independent initial upstream-downstream BWP are overlapped. The second updating unit firstly judges whether the signaling issued by the network side has non-initial BWP and designates the non-initial BWP as priority activated BWP; if yes, the BWP is selected and parameters are updated according to the priority activated BWP issued by the network side; otherwise, updating the independent initial uplink and downlink BWP according to the initial BWP special parameter issued by the network side.
The invention has the technical effects that: the NCD-SSB information is acquired in advance before the access of the RedCAP terminal to the network is successful, so that the random access flow of the RedCAP terminal is optimized according to the NCD-SSB information.
Drawings
Fig. 1 is a flowchart of an embodiment one of a method for optimizing access of a RedCap terminal to a network according to the present invention.
Fig. 2 is a flow chart of a second embodiment of the method for optimizing access of a RedCap terminal to a network according to the present invention.
Fig. 3 is a schematic structural diagram of an embodiment one of an optimization apparatus for access network of a RedCap terminal according to the present invention.
Fig. 4 is a schematic structural diagram of a second embodiment of an optimizing apparatus for access network of a RedCap terminal according to the present invention.
The reference numerals in the drawings illustrate: the system comprises a network configuration unit 1, a system message reading unit 2, a NCD-SSB measurement estimation unit 3, a NCD-SSB searching and decoding unit 4, a NCD-SSB credibility judging unit 5, a first correction unit 6, a second correction unit 7, a special parameter acquisition unit 8, a first updating unit 9 and a second updating unit 10.
Detailed Description
Referring to fig. 1, an embodiment of a method for optimizing access to a network by a RedCap terminal according to the present invention includes the following steps.
Step S1: the network side selects whether to configure independent initial downlink BWP in SIB1 message, and the network side also selects whether to issue NCD-SSB information in existing or newly added SIB message. The configuration of the independent initial downlink BWP refers to configuration of an initial downlink BWP-Redcap-r17 parameter in the SIB 1. In this step, if the network side configures the independent initial downlink BWP in the SIB1 message, the network side also configures the independent initial uplink BWP in the SIB1 message, which means that the uplink configuration parameter of the common-v1700 is configured in SIB1, but this is not required.
The issuing of NCD-SSB information in SIB messages is not described in existing communication protocols, and the applicant believes that it is possible to add relevant content in future communication protocols. For example, the network side carries the NCD-SSB information in any one or more of the existing SIB1 to SIB21, or the network side adds a new SIB22 message for issuing the NCD-SSB information. The NCD-SSB information includes: ARFCN (absolute radio channel number) of the NCD-SSB center frequency point, period of NCD-SSB, offset of NCD-SSB from CD-SSB (cell definition SSB), and the like. Based on future communication protocols or pre-agreements of both the RedCap terminal and the network, both the RedCap terminal and the network know which SIB message is used to carry the NCD-SSB information.
Step S2: the RedCap terminal reads system information of a 5G NR cell suitable for camping through a network searching process, including MIB (Master Information Block ), SIB1, and SIB for carrying NCD-SSB information. The SIB for carrying NCD-SSB information may be SIB1 or may be other SIB messages different from SIB1, depending on future communication protocols or pre-agreements of both the RedCap terminal and the network.
If no independent initial downlink BWP is configured in SIB1, the RedCAP terminal performs random access flow according to the current communication protocol.
If the independent initial downlink BWP is configured in the SIB1, the RedCAP terminal obtains the bandwidth range according to the independent initial downlink BWP parameters. At this time, if NCD-SSB information has been issued in the SIB for carrying NCD-SSB information and the bandwidth range of the independent initial downlink BWP completely contains NCD-SSB, step S3 is entered. At this time, if NCD-SSB information has been issued in the SIB for carrying NCD-SSB information and the bandwidth range of the independent initial downlink BWP is not fully contained or not contained at all, step S7 is entered. At this time, if the NCD-SSB information is not issued in the SIB for carrying the NCD-SSB information and the bandwidth range of the independent initial downlink BWP is not fully contained or does not contain the CD-SSB at all, step S4 is entered. At this time, if the NCD-SSB information is not issued in the SIB for carrying the NCD-SSB information and the bandwidth range of the independent initial downlink BWP completely contains the CD-SSB, step S7 is entered.
Step S3: the RedCap terminal periodically measures the NCD-SSB signal according to the NCD-SSB information, and then carries out correlation estimation (correlation estimation) on the NCD-SSB signal to obtain a channel estimation result of the NCD-SSB signal. The SSB signal includes PSS (Primary Synchronization Signal ), SSS (Secondary Synchronization Signal, secondary synchronization signal), PBCH DMRS (demodulation reference signal of physical broadcast channel, where PBCH represents physical Boardcast Channel, physical broadcast channel, DMRS represents Demodulatin Reference Signal, demodulation reference signal), and actual bearer data (i.e., MIB) of PBCH. The PBCH DMRS is a reference signal with fixed position, and the UE estimates various offset, noise and other parameters of the current channel by comparing the generated ideal PBCH DMRS data with the actually received PBCH DMRS data; and then, attempting to decode the PBCH according to the estimated result to obtain the MIB. The channel estimation result of the NCD-SSB signal comprises MIB obtained by carrying out channel estimation on PBCH DMRS in the NCD-SSB signal and decoding PBCH data. Then step S5 is entered.
Step S4: the RedCap terminal finds out the GSCN (Global Synchronization Channel Number ) within the bandwidth of the independent initial downstream BWP, which is the frequency point that the SSB specified by the protocol can exist. The RedCap terminal then performs PSS and SSS synchronization on the NCD-SSB signal at these potential NCD-SSB frequency points (i.e., GSCN), and attempts PBCH decoding on the NCD-SSB signal after success. After the PBCH decoding is successful and the MIB is read, the RedCap terminal can confirm that a real NCD-SSB signal exists in the current target frequency point, and also obtain a channel estimation result of the NCD-SSB signal (MIB obtained after channel estimation of the PBCH DMRS in the NCD-SSB signal and decoding of the PBCH data), and then go to step S5. In the step S4, if the relevant synchronization of the PSS or SSS fails, or the PBCH decoding fails, the NCD-SSB signal is considered to be not trusted, and then step S7 is entered.
Step S5: and judging whether the NCD-SSB signal is credible or not according to the channel estimation result of the NCD-SSB signal. For example, when the SNR (signal-to-noise ratio) of the DMRS estimate of the NCD-SSB signal is greater than or equal to a specific threshold, or the physical cell ID described in the NCD-SSB signal is the same as the physical cell ID described in the CD-SSB, or the systematic frame number and the sub-carrier spacing in the MIB in the NCD-SSB signal are the same as the contents of the systematic frame number and the sub-carrier spacing in the MIB in the CD-SSB signal, the RedCap terminal considers the NCD-SSB signal to be authentic. At this time, the RedCap terminal saves the channel estimation result of the NCD-SSB signal and enters step S6; otherwise, step S7 is entered.
Step S6: the SSB is a periodic broadcast signal, and after the UE camps in each cell, the SSB signal (including the NCD-SSB signal determined to be authentic) is periodically measured to obtain the channel estimation result of the NCD-SSB signal, so as to evaluate the channel quality and make corrections. The RedCap terminal corrects a time deviation or a frequency deviation which may exist between the RedCap terminal and the network by taking a channel estimation result of the NCD-SSB signal as a reference, adjusts downlink reception according to signal strength, and uses the channel estimation result of the NCD-SSB signal as a reference for blind detection of PDCCH (Physical Downlink Control Channel ) information. And then the RedCAP terminal selects resources to initiate a random access flow according to the current communication protocol requirement.
Step S7: SSB is a periodic broadcast signal, and after the UE camps on each cell, the SSB signal (including the CD-SSB signal) is periodically measured to obtain the channel estimation result of the CD-SSB signal, so as to evaluate the channel quality and make corrections. The RedCAP terminal uses the channel estimation result of the CD-SSB signal as a reference, corrects possible time deviation or frequency deviation between the RedCAP terminal and the network, adjusts downlink receiving according to signal strength, and uses the channel estimation result of the CD-SSB signal as a reference for blind detection of PDCCH information. And then the RedCAP terminal selects resources to initiate a random access flow according to the current communication protocol requirement.
The first embodiment discloses a method for optimizing access network of a RedCap terminal. Before the access of the RedCap terminal to the network succeeds, the network side can issue NCD-SSB information in the system information so that the RedCap terminal can know available physical resources (namely NCD-SSB information) in advance, and therefore the random access flow is optimized according to the NCD-SSB information. In one case (step S3), the network side notifies the UE of the frequency point where the NCD-SSB is located in the system information. In another case (step S4), the network side does not notify that NCD-SSB exists in the system information and the CD-SSB is not completely or not completely within the bandwidth range of the independent initial downlink BWP, the RedCap terminal tries to search for NCD-SSB frequency points that may exist within the bandwidth range of the independent initial downlink BWP. Subsequent to these two cases, if the UE obtains NCD-SSB information deemed reliable by searching (i.e., step S5), then the NCD-SSB signal is used as a reference to correct the downlink BWP time offset, frequency offset, reception and transmission power during the subsequent access procedure (i.e., step S6). Steps S4-S6 of the present invention determine whether the RedCap terminal can find available physical resources (i.e., NCD-SSB signals) in advance and use the NCD-SSB signals for channel estimation. This optimizes the registration network flow before the UE receives signaling such as RRC Setup (which traditionally only allows the NCD-SSB to acquire frequency point information).
Referring to fig. 2, the second embodiment of the method for optimizing access to a network by a RedCap terminal according to the present invention further includes the following steps after steps S6 and S7 of the first embodiment.
Step S8: after the RedCap terminal accesses the network, the network side issues one or more of RRC Setup, RRC Resume, RRC Reestablishment, RRC Reconfiguration, etc. signaling, which carries the initial BWP-specific parameters. The initial BWP specific parameters include PUCCH (Physical Uplink Control Channel ) resource information for SR transmission and other necessary uplink and downlink interaction information. If the network side explicitly indicates that the initial BWP specific parameter is used to update the independent initial uplink and downlink BWP in the signaling carrying the initial BWP specific parameter, then step S9 is entered; otherwise, the process advances to step S10.
The explicit indication includes either of the following two ways. Mode one: the network side adds parameters like redcap-initial downlink BWP-r17 and/or redcap-initial uplink BWP-r17 to the independent initial uplink and downlink BWP levels in the serving cell configuration carrying signaling of the initial BWP specific parameters. This indicates that the initial BWP specific parameters are used to update the independent initial upstream BWP. Mode two: explicit description is added in future communication protocols to update the independent initial upstream and downstream BWP with the configuration of the initial BWP specific parameters.
Step S9: the RedCap terminal updates the independent initial uplink and downlink BWP according to the initial BWP-specific parameters issued by the network side. The updating means that: the parameters of the independent initial uplink and downlink BWP are supplemented in the configuration of the initial BWP-specific parameters, and the initial BWP-specific parameters are preferentially used when there is an overlap. According to the protocol, a part of the initial BWP specific parameters cannot be carried in the independent initial uplink and downlink BWP (belonging to the initial BWP general parameters), so these initial BWP specific parameters may be considered as functional supplements to the independent initial uplink and downlink BWP for the UE (e.g. the SR resource configuration, or CSI related resource configuration mentioned above, etc.). Wherein CSI represents channel state information (channel state information). Other initial BWP specific parameters may functionally overlap with existing configurations within the independent initial upstream and downstream BWP, which in part requires a determination of which parameters to choose for use depending on the protocol and the specific scenario, with the specific parameters typically being used preferentially.
Step S10: if signaling such as RRC Setup, RRC Resume, RRC Reestablishment, RRC Reconfiguration and the like issued by the network side carries non-initial BWP and designates the non-initial BWP as a priority activated BWP, the RedCap terminal selects BWP and updates parameters according to the priority activated BWP issued by the network side. The priority activation BWP includes a first activeuplinkbwp-Id and a first activedownlinkbwp-Id, which are BWP used by the network side to indicate that data interaction with the terminal is desired. If the priority activated BWP received by the terminal does not match the BWP currently used for activation, BWP handover is required.
If signaling such as RRC Setup, RRC Resume, RRC Reestablishment, RRC Reconfiguration and the like issued by the network side does not carry non-initial BWP, or the priority activated BWP is initial BWP, the RedCap terminal updates the independent initial uplink and downlink BWP according to the initial BWP specific parameters issued by the network side, that is: the respective parameters are used when the initial BWP-specific parameter and the independent initial upstream-downstream BWP are not overlapped, and the initial BWP-specific parameter is preferentially used when the initial BWP-specific parameter and the independent initial upstream-downstream BWP are overlapped.
In the second embodiment, after the RedCap terminal completes the random access procedure, the signaling sent by the network side may be configured with an initial BWP specific parameter, and the present invention provides a corresponding processing manner as a subsequent supplement to the method shown in fig. 1 for different situations that whether the network side explicitly indicates to update the independent initial uplink and downlink BWP with the initial BWP specific parameter in the signaling.
Referring to fig. 3, an embodiment of an optimization apparatus for access network of a RedCap terminal according to the present invention includes a network configuration unit 1, a system message reading unit 2, an NCD-SSB measurement estimation unit 3, an NCD-SSB search decoding unit 4, an NCD-SSB trusted judgment unit 5, a first correction unit 6, and a second correction unit 7. The apparatus shown in fig. 3 corresponds to the method shown in fig. 1.
The network configuration unit 1 is configured to select whether to configure an independent initial downlink BWP in the SIB1 message and to select whether to issue NCD-SSB information in an existing or newly added SIB message.
The system message reading unit 2 is configured to read system information of a 5G NR cell suitable for camping, including MIB, SIB1, and SIB for carrying NCD-SSB information. Here, five cases are divided. Case one: if no independent initial downlink BWP is configured in SIB1, the RedCAP terminal performs random access flow according to the current communication protocol. Case two-case five: if the independent initial downlink BWP is configured in the SIB1, the RedCAP terminal obtains the bandwidth range according to the independent initial downlink BWP parameters. And a second case: if the NCD-SSB information has been issued in the SIB and the bandwidth range of the independent initial downstream BWP completely contains the NCD-SSB, then the NCD-SSB measurement estimation unit 3 is entered subsequently. Case three: if the NCD-SSB information has been issued in the SIB and the bandwidth range of the independent initial downstream BWP is not fully or completely comprised, the second correction unit 7 is subsequently entered. Case four: if no NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downstream BWP is not fully contained or contains no CD-SSB at all, then the NCD-SSB search decoding unit 4 is entered subsequently. Case five: if no NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downstream BWP completely contains the CD-SSB, the second correction unit 7 is subsequently entered.
The NCD-SSB measurement estimation unit 3 is used for periodically measuring and performing related estimation on the NCD-SSB signal according to the NCD-SSB information to obtain a channel estimation result of the NCD-SSB signal, wherein the channel estimation result comprises a MIB obtained after channel estimation on a PBCH DMRS in the NCD-SSB signal and decoding of PBCH data; then enters the NCD-SSB trusted judgment unit 5.
The NCD-SSB search decoding unit 4 is configured to find GSCNs within the bandwidth of the independent initial downlink BWP, and then perform PSS and SSS synchronization on the NCD-SSB signals at these GSCNs, and attempt PBCH decoding on the NCD-SSB signals after success. When the PBCH decoding is successful, it is confirmed that a real NCD-SSB signal exists in the current target frequency point, and a channel estimation result of the NCD-SSB signal is also obtained, and then the NCD-SSB trusted judgment unit 5 is entered.
The NCD-SSB credibility judging unit 5 is used for judging whether the NCD-SSB signals obtained by the NCD-SSB measurement estimating unit 3 and the NCD-SSB searching and decoding unit 4 are credible or not. If the first correction unit 6 is trusted, subsequently entering the first correction unit; otherwise the second correction unit 7 is entered.
The first correction unit 6 evaluates the channel quality and makes corrections based on the channel estimation result of the NCD-SSB signal.
The second correction unit 7 evaluates the channel quality and makes a correction based on the channel estimation result of the CD-SSB signal.
Referring to fig. 4, a dedicated parameter obtaining unit 8, a first updating unit 9, and a second updating unit 10 are added to the second embodiment of the optimizing apparatus for a RedCap terminal access network according to the present invention. The apparatus shown in fig. 4 corresponds to the method shown in fig. 2.
The dedicated parameter obtaining unit 8 is configured to obtain an initial BWP dedicated parameter from signaling issued by the network side. If the network side explicitly indicates that the initial BWP specific parameters are used for updating the independent initial upstream-downstream BWP (case six), then the first updating unit 9 is entered subsequently; otherwise (case seven) the second updating unit 10 is subsequently entered.
The first updating unit 9 is configured to update the independent initial uplink and downlink BWP according to the initial BWP-specific parameter issued by the network side. The updating means that: the respective parameters are used when the initial BWP-specific parameter and the independent initial upstream-downstream BWP are not overlapped, and the initial BWP-specific parameter is preferentially used when the initial BWP-specific parameter and the independent initial upstream-downstream BWP are overlapped.
The second updating unit 10 first determines whether there is a non-initial BWP in the signaling issued by the network side and designates the non-initial BWP as a priority activated BWP. If so, BWP is selected and parameters are updated according to the priority activated BWP issued by the network side. Otherwise, updating the independent initial uplink and downlink BWP according to the initial BWP special parameter issued by the network side.
The invention optimizes the method of the Redcap terminal accessing the network by definitely using the physical resources. The invention creatively provides the steps S4-S6 for acquiring the NCD-SSB information in advance before the access of the RedCAP terminal to the network is successful, and the subsequent steps S9-S10 can enable the RedCAP terminal to more clearly understand the parameter configuration issued by the network.
The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The optimization method for the access network of the RedCAP terminal is characterized by comprising the following steps of;
step S1: the network side selects whether to configure an independent initial downlink bandwidth part BWP in a SIB1 message of a system information block type and whether to issue non-cell definition synchronous signal block NCD-SSB information in an existing or newly added SIB message;
step S2: the method comprises the steps that a RedCAP terminal reads system information of a 5G NR cell suitable for residence, wherein the system information comprises a master information block MIB, a SIB1 and a SIB used for carrying NCD-SSB information;
if no independent initial downlink BWP is configured in the SIB1, the RedCAP terminal performs a random access flow according to the current protocol;
if the independent initial downlink BWP is configured in the SIB1, continuing to judge: if NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP completely contains NCD-SSB, the step S3 is entered; if NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP is not completely or completely contained, proceeding to step S7; if no NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP is not fully contained or does not contain the cell definition synchronization signal block CD-SSB at all, proceeding to step S4; if no NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP completely contains CD-SSB, proceeding to step S7;
step S3: the RedCAP terminal performs periodic measurement and correlation estimation on the NCD-SSB signal according to the NCD-SSB information to obtain a channel estimation result of the NCD-SSB signal; the method comprises the steps of carrying out channel estimation on a physical broadcast channel demodulation reference signal (PBCH DMRS) in an NCD-SSB signal and obtaining MIB after decoding PBCH data; then step S5 is entered;
step S4: the RedCAP terminal finds out a global synchronization channel number GSCN in the bandwidth range of an independent initial downlink BWP, then carries out relevant synchronization of a primary synchronization signal PSS and a secondary synchronization signal SSS on an NCD-SSB signal in the GSCN, and tries to carry out PBCH decoding on the NCD-SSB signal after success; after PBCH decoding is successful, the RedCAP terminal considers that a real NCD-SSB signal exists in the current target frequency point, and also obtains the channel estimation result of the NCD-SSB signal, and then step S5 is carried out;
step S5: judging whether the NCD-SSB signal is credible or not according to a channel estimation result of the NCD-SSB signal; if the NCD-SSB signal is considered to be authentic, proceeding to step S6; otherwise, entering step S7;
step S6: the RedCAP terminal takes the channel estimation result of the NCD-SSB signal as a reference, and evaluates the channel quality and corrects the channel quality;
step S7: the RedCap terminal evaluates the channel quality and makes corrections with reference to the channel estimation result of the CD-SSB signal.
2. The method for optimizing access to a network by a RedCap terminal according to claim 1, wherein in the step S1, the network side carries NCD-SSB information in any one or more SIBs existing, or the network side adds an SIB message newly for issuing NCD-SSB information; the NCD-SSB information includes: one or more of an absolute radio frequency channel number ARFCN of the NCD-SSB center frequency point, a period of the NCD-SSB, and an offset of the NCD-SSB relative to the CD-SSB.
3. The method according to claim 1, wherein in step S4, if the relevant synchronization of the RedCap terminal to the NCD-SSB signal at the GSCN fails, or the PBCH decoding of the NCD-SSB signal is attempted, the NCD-SSB signal is considered to be unreliable, and then step S7 is performed.
4. The method according to claim 1, wherein in the step S5, when the signal-to-noise ratio SNR estimated by the DMRS of the NCD-SSB signal is greater than or equal to a specific threshold, or the physical cell ID described in the NCD-SSB signal is the same as the physical cell ID described in the CD-SSB, or the system frame number and subcarrier spacing in the MIB in the NCD-SSB signal are the same as the content of the system frame number and subcarrier spacing in the MIB in the CD-SSB signal, the RedCap terminal considers the NCD-SSB signal to be authentic; otherwise the RedCap terminal considers the NCD-SSB signal not authentic.
5. The method for optimizing access to a network by a RedCap terminal according to claim 1, wherein the step S6 specifically includes: the RedCAP terminal takes the channel estimation result of the NCD-SSB signal as a reference, corrects possible time deviation or frequency deviation between the RedCAP terminal and a network, adjusts downlink reception according to signal strength, and also takes the channel estimation result of the NCD-SSB signal as a reference for blind detection of Physical Downlink Control Channel (PDCCH) information; and then the RedCAP terminal performs a random access flow according to the current communication protocol.
6. The method for optimizing access to a network by a RedCap terminal according to claim 1, wherein the step S7 specifically includes: the RedCAP terminal takes the channel estimation result of the CD-SSB signal as a reference, corrects possible time deviation or frequency deviation between the RedCAP terminal and a network, adjusts downlink reception according to signal strength, and takes the channel estimation result of the CD-SSB signal as a reference for blind detection of Physical Downlink Control Channel (PDCCH) information; and then the RedCAP terminal performs a random access flow according to the current communication protocol.
7. The method for optimizing access to a network by a RedCap terminal according to claim 1, wherein the steps S6 and S7 are followed by the steps of;
step S8: after the RedCap terminal is accessed to the network, the initial BWP special parameter is obtained from the signaling issued by the network side; if the network side explicitly indicates that the initial BWP specific parameter is used to update the independent initial uplink and downlink BWP in the signaling, then step S9 is entered; otherwise, enter step S10;
step S9: the RedCAP terminal updates independent initial uplink and downlink BWP according to the initial BWP special parameter; the updating means that: the respective parameters are used when the initial BWP specific parameters and the independent initial uplink and downlink BWP are not overlapped, and the initial BWP specific parameters are preferentially used when the initial BWP specific parameters and the independent initial uplink and downlink BWP are overlapped;
step S10: if the signaling issued by the network side carries the non-initial BWP and designates the non-initial BWP as the priority activated BWP, the RedCAP terminal selects the BWP and updates the parameters according to the priority activated BWP issued by the network side; otherwise, the RedCap terminal updates the independent initial uplink and downlink BWP according to the initial BWP special parameter issued by the network side.
8. The method for optimizing access to a network by a RedCap terminal according to claim 7, wherein in the step S8, the explicit indication includes any one of the following two manners; mode one: the network side increases the parameters of the level of the independent initial uplink and downlink BWP in the service cell configuration SeringCellConfig carrying the signaling of the initial BWP special parameters; mode two: explicit description is added in the communication protocol to update the independent initial upstream and downstream BWP with the configuration of the initial BWP specific parameters.
9. The optimizing device for the access network of the RedCAP terminal is characterized by comprising a network configuration unit, a system message reading unit, an NCD-SSB measurement and estimation unit, an NCD-SSB search and decoding unit, an NCD-SSB trusted judgment unit, a first correction unit and a second correction unit;
the network configuration unit is configured to select whether to configure the independent initial downlink bandwidth part BWP in the SIB1 message of the system information block type one, and also select whether to issue the NCD-SSB information of the non-cell definition synchronization signal block in the existing or newly added SIB message;
the system message reading unit is used for reading system information of a 5G NR cell suitable for residence, and comprises a master information block MIB, a SIB1 and a SIB used for carrying NCD-SSB information; if no independent initial downlink BWP is configured in the SIB1, the RedCAP terminal performs a random access flow according to the current communication protocol; if the independent initial downlink BWP is configured in the SIB1, continuing to judge: if NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP completely contains NCD-SSB, then subsequently entering an NCD-SSB measurement estimation unit; if NCD-SSB information is issued in the SIB and the bandwidth range of the independent initial downlink BWP is not completely contained or does not contain NCD-SSB at all, then a second correction unit is subsequently entered; if NCD-SSB information is not issued in the SIB and the bandwidth range of the independent initial downlink BWP is not completely contained or does not contain the cell definition synchronization signal block CD-SSB at all, then the method subsequently enters a NCD-SSB search decoding unit; if NCD-SSB information is not issued in the SIB and the bandwidth range of the independent initial downlink BWP completely contains CD-SSB, then a second correction unit is subsequently entered;
the NCD-SSB measurement estimation unit is used for periodically measuring and correlatively estimating the NCD-SSB signal according to the NCD-SSB information to obtain a channel estimation result of the NCD-SSB signal, wherein the channel estimation result comprises MIB obtained after channel estimation of a physical broadcast channel demodulation reference signal PBCH DMRS in the NCD-SSB signal and decoding of PBCH data; then enter the NCD-SSB credible judgment unit;
the NCD-SSB searching and decoding unit is used for finding out GSCN in the bandwidth range of the independent initial downlink BWP, then performing PSS and SSS related synchronization on the NCD-SSB signal in the GSCN, and attempting PBCH decoding on the NCD-SSB signal after success; when PBCH decoding is successful, the current target frequency point is considered to have a real NCD-SSB signal, and a channel estimation result of the NCD-SSB signal is also obtained, and then the NCD-SSB signal enters an NCD-SSB trusted judgment unit;
the NCD-SSB credibility judging unit is used for judging whether the NCD-SSB signals obtained by the NCD-SSB measurement estimating unit and the NCD-SSB searching and decoding unit are credible or not; if the first correction unit is trusted, subsequently entering the first correction unit; otherwise, entering a second correction unit;
the first correction unit evaluates the channel quality according to the channel estimation result of the NCD-SSB signal and corrects the channel quality;
the second correction unit evaluates the channel quality and corrects the channel quality according to the channel estimation result of the CD-SSB signal.
10. The apparatus for optimizing access of a RedCap terminal to a network according to claim 9, further comprising a dedicated parameter obtaining unit, a first updating unit, and a second updating unit;
the special parameter obtaining unit is used for obtaining the initial BWP special parameter from the signaling issued by the network side; if the network side explicitly indicates that the initial BWP special parameter is used for updating the independent initial uplink and downlink BWP, then the first updating unit is subsequently entered; otherwise, subsequently entering a second updating unit;
the first updating unit is configured to update the independent initial uplink and downlink BWP according to the initial BWP specific parameter issued by the network side; the updating means that: the respective parameters are used when the initial BWP specific parameters and the independent initial uplink and downlink BWP are not overlapped, and the initial BWP specific parameters are preferentially used when the initial BWP specific parameters and the independent initial uplink and downlink BWP are overlapped;
the second updating unit firstly judges whether the signaling issued by the network side has non-initial BWP and designates the non-initial BWP as priority activated BWP; if yes, the BWP is selected and parameters are updated according to the priority activated BWP issued by the network side; otherwise, updating the independent initial uplink and downlink BWP according to the initial BWP special parameter issued by the network side.
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