CN109600841B - Random access method, network node and user equipment - Google Patents
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/50—Allocation or scheduling criteria for wireless resources
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
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Abstract
The disclosure provides a random access method, a network node and user equipment. According to the method, a user equipment UE performs measurements for signals of a target cell, and then the UE transmits measurement reports on the signals of the target cell to a network node corresponding to a serving cell. The UE receives a handover command including resource configuration information for random access from a network node. The UE performs random access in the target cell based on the resource configuration information. By utilizing the scheme of the embodiment of the invention, the performance of the UE random access target cell can be improved.
Description
Technical Field
The present disclosure relates to the field of wireless communications technologies, and in particular, to a random access method, a network node, and a user equipment.
Background
With the rapid development of the information industry, especially the growing demand from the mobile internet and the internet of things (internet of things, ioT), the future mobile communication technology is challenged unprecedented. To address this unprecedented challenge, the communications industry and academia have developed extensive fifth generation mobile communication technology (5G) research to face the 2020 s.
The performance of random access directly affects the user experience. In communication systems such as long term evolution (Long Term Evolution, LTE) and evolved LTE (LTE-Advanced), the random access procedure is divided into Contention-based random access (content-based Random Access) and non-Contention-based random access (content-free Random Access) according to whether a user monopolizes a preamble sequence resource. Since each user selects a preamble sequence from the same preamble sequence resources in an attempt to establish an uplink connection in contention-based random access, it may happen that a plurality of users select the same preamble sequence to transmit to a base station. Therefore, new random access technologies are needed to improve random access performance.
Disclosure of Invention
The present disclosure provides a random access method, a network node and a User Equipment (UE).
According to an aspect of the present disclosure, there is provided a random access method including the steps of: the User Equipment (UE) measures signals of a target cell; the UE sends a measurement report about the signal of the target cell to a network node corresponding to a serving cell; the UE receiving a handover command from the network node including resource configuration information for random access; and the UE performs random access in the target cell based on the resource configuration information.
In an exemplary embodiment, the resource configuration information includes at least one of: random access resource configuration information based on a common uplink; and random access resource configuration information based on the supplemental uplink.
In an exemplary embodiment, the resource configuration information further includes an indication to the UE indicating whether to use a normal uplink or a supplemental uplink for random access.
In an exemplary embodiment, the resource configuration information further includes dedicated random access resource configuration information sent to the UE.
In an exemplary embodiment, the dedicated random access resource configuration information includes a first threshold for the UE to determine whether to use a normal uplink or a supplemental uplink for random access.
In an exemplary embodiment, the UE obtains the measurement report by measuring a synchronization signal block SSB or a configured channel state information reference signal CSI-RS of the target cell, and the resource configuration information further includes: the mapping relation between the SSB and the corresponding random access resource or the mapping relation between the CSI-RS and the corresponding random access resource; and a second threshold for selecting the SSB or the CSI-RS.
In an exemplary embodiment, the UE obtains the measurement report by measuring a synchronization signal block SSB or a configured channel state information reference signal CSI-RS of the target cell, and the dedicated random access resource configuration information includes: the mapping relation between the SSB and the corresponding random access resource or the mapping relation between the CSI-RS and the corresponding random access resource; and a second threshold for selecting the SSB or the CSI-RS.
In an exemplary embodiment, the method further comprises the step of: the UE compares the latest signal measurement result of the target cell with the first threshold value, and determines whether to use the normal uplink or the supplementary uplink for random access according to the comparison result.
According to another aspect of the present disclosure, there is provided a random access method including the steps of: receiving a measurement report on a signal of a target cell from a user equipment UE; and sending a switching command comprising resource configuration information for random access to the UE based on the measurement report.
In an exemplary embodiment, the resource configuration information includes at least one of: random access resource configuration information based on a common uplink; and random access resource configuration information based on the supplemental uplink.
In an exemplary embodiment, the resource configuration information further includes an indication to the UE indicating whether to use a normal uplink or a supplemental uplink for random access.
In an exemplary embodiment, the resource configuration information further includes dedicated random access resource configuration information sent to the UE.
In an exemplary embodiment, the dedicated random access resource configuration information includes a first threshold for the UE to determine whether to use a normal uplink or a supplemental uplink for random access.
In an exemplary embodiment, the measurement report is obtained by the UE by measuring a synchronization signal block SSB or a configured channel state information reference signal CSI-RS of the target cell, and the resource configuration information further includes: the mapping relation between the SSB and the corresponding random access resource or the mapping relation between the CSI-RS and the corresponding random access resource; and a second threshold for selecting the SSB or the CSI-RS.
In an exemplary embodiment, the measurement report is obtained by the UE by measuring a synchronization signal block SSB or a configured channel state information reference signal CSI-RS of the target cell, and the dedicated random access resource configuration information includes: the mapping relation between the SSB and the corresponding random access resource or the mapping relation between the CSI-RS and the corresponding random access resource; and a second threshold for selecting the SSB or the CSI-RS.
According to another aspect of the present disclosure, there is provided a user equipment comprising: a communication interface configured for communication; a processor; and a memory storing computer executable instructions that, when executed by the processor, cause the processor to: measuring signals of a target cell; transmitting a measurement report on a signal of the target cell to a network node corresponding to a serving cell; receiving a handover command including resource configuration information for random access from the network node; and performing random access in the target cell based on the resource configuration information.
According to another aspect of the present disclosure, there is provided a network node comprising: a communication interface configured for communication; a processor; and a memory storing computer executable instructions that, when executed by the processor, cause the processor to: receiving a measurement report on a signal to a target cell from a user equipment UE; and sending a switching command comprising resource configuration information for random access to the UE based on the measurement report.
By utilizing the scheme of the embodiment of the invention, the performance of the UE random access target cell can be improved.
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For a better understanding of the present invention, the present invention will be described in detail with reference to the following drawings:
fig. 1 shows a schematic flow chart of a procedure of contention-based random access;
fig. 2 shows a schematic flow chart of a random access method according to an exemplary embodiment of the present disclosure;
fig. 3 illustrates a schematic diagram of a UE selecting a random access channel according to an exemplary embodiment of the present disclosure;
fig. 4 shows a schematic flow chart of a method of random access at a UE according to another exemplary embodiment of the disclosure;
fig. 5 illustrates a schematic structural view of an apparatus according to an exemplary embodiment of the present disclosure; and
fig. 6 shows a signal flow diagram between devices to which a method according to an exemplary embodiment of the present disclosure is applied.
Detailed Description
In order to make the objects, technical means and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings. The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present disclosure and are not to be construed as limiting the present disclosure.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 shows a schematic flow diagram of a procedure 100 for contention-based random access in LTE-a. As shown in fig. 1, in step S110, a User Equipment (UE) randomly selects a preamble sequence from a preamble sequence resource pool and transmits the preamble sequence to a base station. The base station performs correlation detection on the received signal, thereby identifying the preamble sequence transmitted by the UE.
In step S120, the base station transmits a random access response (Random Access Response, RAR) to the UE, including the random access preamble sequence identifier, a timing advance instruction determined according to the delay estimation between the UE and the base station, a temporary Cell radio network temporary identity (Cell-Radio Network Temporary Identifier, C-RNTI), and a time-frequency resource allocated for the next uplink transmission of the UE.
In step S130, the UE sends a message three (Msg 3) to the base station according to the information in the RAR. The Msg3 contains information such as UE terminal identity (e.g. S-TMSI, random number, etc.) and radio resource control (Radio Resource Control, RRC) connection request, etc., where the UE terminal identity is unique to the UE and is used to resolve the conflict.
In step S140, the base station transmits a conflict resolution identity to the UE, which contains the UE terminal identity of the UE that wins the conflict resolution. After detecting the self-contained identifier, the UE upgrades the temporary C-RNTI to the C-RNTI, and sends an Acknowledgement (ACK) signal to the base station, completes the random access procedure, and waits for the scheduling of the base station. Otherwise, the UE will start a new random access procedure after a delay.
For non-contention based random access procedures, the UE may be allocated a preamble sequence since the base station knows the user identity (which may include a C-RNTI in addition to the UE terminal identity). The UE does not need to randomly select a sequence when transmitting the preamble sequence, but may use the allocated preamble sequence. After detecting the allocated preamble sequence, the base station sends a corresponding random access response including information such as timing advance and uplink resource allocation. After receiving the random access response, the UE considers that the uplink synchronization is completed and waits for further scheduling of the base station. Thus, the non-contention based random access procedure only comprises two steps: step one, transmitting a preamble sequence; and step two, sending a random access response.
The random access procedure in LTE is applicable to the following scenarios:
initial access under RRC IDLE (rrc_idle);
2. reestablishing the RRC connection;
3. cell switching;
the RRC connection state downlink data arrives and requests a random access procedure (when the uplink is asynchronous);
rrc connected downlink and uplink data arrives and requests a random access procedure (when the uplink is in an unsynchronized or physical uplink control channel (Physical Uplink Control Channel, PUCCH) resource, no resource is allocated to the scheduling request);
6. And (5) positioning.
In LTE, the six scenarios described above use the same random access procedure. In a new generation communication system, there may be multiple Uplinks (UL) that may provide random access channel resources. For the initially accessed UE, the system message may be read, all available random access channel resource information obtained, and then the random access resource selected therefrom. But for the handed over UE, before performing the random access of the handover, the UE may measure the signal strength of the target cell (targeting cell) and feed back to the serving cell (serving cell). Based on the measurement report, a network node, e.g., a NodeB, corresponding to the serving cell sends a handover command including resource configuration information for random access to the UE. The decision whether to initiate a handover is made, e.g. by the serving cell, based on the measurement report. If it is decided to initiate a handover, the UE needs to obtain the corresponding random access channel resource allocation information, and when there are random access channel resources in all of the multiple uplinks, the UE needs to obtain its own random access channel resource in a manner.
In a communication system where there are multiple uplinks available for random access by a UE, such as when both a primary cell (Pcell) and a secondary cell (Scell) are present, the base station may configure which cell's uplink the UE uses for random access. On the other hand, in a communication system, there may be multiple available uplinks, a Common uplink (Common UL) and a Supplementary uplink (Supplementary UL), the latter being for UEs with poor channel conditions in a larger coverage area. Therefore, the UE does not have to select the uplink according to the instruction of the base station. It is possible that the measurement reports of UEs owned by the base station are not timely, so the most accurate uplink cannot be selected for random access, which is not advantageous for the UEs to achieve fast handover.
In the embodiment of the invention, the common uplink may also be called a first uplink, and the supplementary uplink may also be called a second uplink.
The disclosure provides a random access method, a network node and UE. When the UE performs the switching operation, the target cell is measured first, and the measurement result is fed back to the serving cell. Based on the measurement report, a network node, e.g., a NodeB, corresponding to the serving cell sends a handover command including resource configuration information for random access to the UE. For example, the serving cell determines whether to perform handover based on the measurement report, and notifies the UE of random access resource configuration information of the target cell, wherein the used uplink and its corresponding random access resource configuration information can be directly determined by the serving cell. The serving cell may notify the UE of all available uplinks and their corresponding random access resource configuration information and the corresponding decision threshold, and the UE may determine the selected uplinks and their corresponding random access resource configuration information. In addition, when there is a certain time interval from the UE obtaining the above-mentioned resource configuration information to the UE actually starting to switch random access, the UE may select uplink and its corresponding random access resource using the latest measurement result. Thus, the UE can select the most accurate uplink in time for random access.
A random access method according to a first exemplary embodiment of the present disclosure will be described in detail below with reference to fig. 2.
Fig. 2 shows a schematic flow chart of a random access method 200 according to a first exemplary embodiment of the present disclosure. As shown in fig. 2, in step S210, a network node corresponding to a serving cell (hereinafter simply referred to as a "network node") receives a measurement report on a signal to a target cell from a UE. In some embodiments, the network node may be a base station, an eNB, a NodeB, a radio access network central control unit, a radio access network node distribution unit, or the like. The measurement report may include Reference Signal received power (RSRP: reference Signal Receiving Power) of the target cell obtained by the UE by measuring a synchronization Signal block (SSB: synchronization Signal Block) of the target cell or a configured channel state information Reference Signal (CSI-RS: channel Status Information-Reference Signal). In addition, the measurement report may further include an SSB index or a CSI-RS index to be fed back to the serving cell. Here, the UE may determine one or more SSB indexes or CSI-RS indexes to be fed back to the serving cell through a threshold configured by the network node. Specifically, for example, when the UE measures SSB-based RSRP (ssb_rsrp), if ssb_rsrp is equal to or greater than threshold1, the UE records the index of the SSB and notifies the serving cell. The UE may inform the serving cell of indexes of all M SSBs satisfying the threshold. Alternatively, the UE may moderately select N (N < M) SSBs from all M SSBs satisfying the threshold and notify the serving cell of its index. The threshold value threshold1 used for the judgment and the number N to be selected are notified to the UE by the network node. The case of using CSI-RS is similar to SSB and will not be described here again.
In step S220, the network node transmits a handover command including resource configuration information for random access to the UE based on the measurement report (e.g., RSRP of the target cell). For example, the network node determines whether the UE is handed over from the serving cell to the target cell. In particular, the network node may determine whether the UE needs to perform handover by comparing RSRP (rsrp_report) reported by the UE with a preset threshold (threshold_ho). For example: if RSRP_report > threshold_HO, determining that the UE needs to be switched; if RSRP_report is less than or equal to threshold_HO, it is determined that the UE does not need to perform handover.
If it is determined that the UE needs to be handed over from the serving cell to the target cell, the network node sends a handover command including resource configuration information for random access to the UE. The handover command may be notified to the UE by Radio Resource Control (RRC) signaling, such as a physical downlink shared channel (PDSCH: physical Downlink Shared Channel) or downlink control information (DCI: downlink Control Information) (PDCCH).
In the handover command, the network node informs the UE of resource configuration information for random access. When there are multiple uplinks (i.e., all have random access resource configurations) that can be randomly accessed in the target cell, the target cell is exemplified by the presence of a normal uplink for UEs with better channel state conditions and a supplemental uplink for UEs with worse channel state conditions. When the UE reports the measured RSRP value, the UE does not know the threshold value threshold2 of the target cell used to determine whether to select the normal uplink or the supplementary uplink, and thus the UE cannot determine the configuration information of the random access resource to be used.
Thus, the resource configuration information notified to the UE by the network node according to an exemplary embodiment of the present disclosure may comprise at least one of:
1) Based on random access resource configuration information of the common uplink, implicitly informing the UE to use the common uplink for random access; the UE obtains the time-frequency resource position (including Bandwidth Part indication Bandwidth Part, random access channel resource configuration information) of available random access and the available random access preamble resource (root sequence, cyclic shift value, number of available preamble codes, etc.) from the obtained random access resource configuration; and
2) Based on the random access resource configuration information of the supplemental uplink, implicitly informing the UE to use the supplemental uplink for random access; the UE obtains the time-frequency resource location of the available random access (including Bandwidth Part indication Bandwidth Part, random access channel resource configuration information) and the available random access preamble resource (root sequence, cyclic shift value, number of available preambles, etc.) from the obtained random access resource configuration.
In addition, the resource configuration information may further include one of:
3) An indication to the UE of whether to use the normal uplink or the supplemental uplink for random access; and
4) Threshold2 for the UE to determine whether to use the normal uplink or the supplementary uplink for random access. In this case, the UE can determine whether to perform random access using the normal uplink or to perform random access using the supplementary uplink by comparing the RSRP (rsrp_report) of the reported target cell with the threshold2. For example, if rsrp_report > threshold2, the UE selects to use a normal uplink and determines a selected random access resource from corresponding random access resource configuration information; if RSRP_report is less than or equal to threshold2, the UE selects to use the supplemental uplink and determines a selected random access resource from the corresponding random access resource configuration information.
The above-mentioned resource configuration information may be included in resource configuration information configured in system information of its cell by the target cell, which may be used for contention random access by the UE. That is, the above-described resource configuration information may be included in resource configuration information for contention random access transmitted to the UE by the network node. In addition, the above-mentioned resource configuration information may be further included in dedicated random access resource (RACH-configdediated) configuration information that the network node additionally informs the UE.
Thus, if the UE is not configured with dedicated random access resources, it selects random access resources (random access channel and random access preamble) to initiate competitive random access through the configured random access resource configuration information. If the UE is configured with dedicated random access resources, i.e. the UE is configured with explicit random access resources (specific random access channels and/or specific random access preambles), it initiates random access using the configured dedicated random access resources. The threshold2 for determining whether to select the normal uplink or the supplemental uplink may be put into dedicated random access resource (RACH-configdedided) configuration information as follows:
upon receiving the above-described resource configuration information from the network node, the UE may complete all random access uplink transmissions (msg 1, msg3 and possibly retransmission of msg 3) within the configured or selected uplink.
In addition, the handover command sent by the network node to the UE may further include: mapping relation between SSB reported by UE and corresponding random access resource; or mapping relation between CSI-RS reported by UE and corresponding random access resource. Therefore, after the UE selects one SSB or CSI-RS, the available random access resources can be found through the mapping relationship with the corresponding random access resources.
Fig. 3 illustrates a schematic diagram of a UE selecting a random access channel according to an exemplary embodiment of the present disclosure.
In fig. 3, the UE has selected a supplemental uplink based on the detected RARP value. The UE may then acquire the random access channel resources to use based on a handover command from the network node of the serving cell. The handover command may include a mapping relationship of SSBs reported by the UE and corresponding random access resources. The handover command may also include a threshold value threshold3 for the UE to select the random access resource. When the UE reports a plurality of available SSBs to the network node, before performing random access, the UE may select an SSB greater than or equal to a threshold value threshold3 from the plurality of available SSBs, and then find a corresponding random access channel resource through the selected SSB and a mapping relationship between the SSB and the random access channel. For example, the UE finds a corresponding random access channel resource (e.g., random access channel resource 2 shown in fig. 3) from the selected SSB (e.g., SSB2 shown in fig. 3) through the mapping relationship (e.g., 1-to-1 mapping) of SSB and random access channel notified by the network node of the serving cell. The random access channel resources may include available random access preamble resources, random access channels, time-frequency resources, and the like. The threshold value threshold3 may be notified to the UE in the random access channel resource configuration, or may be notified to the UE through a UE-specific random access configuration.
And then the UE acquires the determined random access preamble code from the exclusive random access resource indication, thereby determining the random access resource. Although the 1-to-1 mapping is exemplified here, the mapping relationship between SSB and random access channel is not limited thereto, and it may be 1-to-many or many-to-1 mapping. The case of using CSI-RS is similar to SSB and will not be described here again.
A method of random access at a UE according to a second exemplary embodiment of the present disclosure will be described in detail with reference to fig. 4.
Fig. 4 shows a schematic flow chart of a method 400 of random access at a UE according to a second exemplary embodiment of the disclosure. As shown in fig. 4, in step S410, the UE performs measurement for a signal of a target cell. In step S420, the UE transmits a measurement report on a signal of the target cell to a network node corresponding to the serving cell. The measurement report may include Reference Signal Received Power (RSRP) of the target cell obtained by the UE by measuring a Synchronization Signal Block (SSB) of the target cell or a configured channel state information reference signal (CSI-RS). In addition, the measurement report may further include an SSB index or a CSI-RS index to be fed back to the serving cell. Here, the UE may determine one or more SSB indexes or CSI-RS indexes to be fed back to the serving cell through a threshold1 configured by the network node. Specifically, for example, when the UE measures SSB-based RSRP (ssb_rsrp), if ssb_rsrp is equal to or greater than threshold1, the UE records the index of the SSB and notifies the serving cell. The UE may inform the serving cell of indexes of all M SSBs satisfying the threshold. Alternatively, the UE may moderately select N (N < M) SSBs from all M SSBs satisfying the threshold and notify the serving cell of its index. The threshold value threshold1 used for the judgment and the number N to be selected are notified to the UE by the network node. The case of using CSI-RS is similar to SSB and will not be described here again.
In step S430, the UE receives a handover command including resource configuration information for random access from the network node. The handover command may be made by the network node based on a measurement report from the UE (e.g. RSRP of the target cell). In particular, the network node may determine whether the UE needs to perform handover by comparing RSRP (rsrp_report) reported by the UE with a preset threshold (threshold_ho). For example: if RSRP_report > threshold_HO, determining that the UE needs to be switched; if RSRP_report is less than or equal to threshold_HO, it is determined that the UE does not need to perform handover. The network node may inform the UE of the handover command through Radio Resource Control (RRC) signaling (PDSCH) or Downlink Control Information (DCI) (PDCCH).
In the handover command, the network node informs the UE of resource configuration information for random access. When there are multiple uplinks (i.e., all have random access resource configurations) that can be randomly accessed in the target cell, the target cell is exemplified by the presence of a normal uplink for UEs with better channel state conditions and a supplemental uplink for UEs with worse channel state conditions. When the UE reports the measured RSRP value, the UE does not know the threshold value threshold2 of the target cell used to determine whether to select the normal uplink or the supplementary uplink, and thus the UE cannot determine the configuration information of the random access resource to be used.
Thus, the resource configuration information notified to the UE by the network node according to an exemplary embodiment of the present disclosure may comprise one of:
1) Based on random access resource configuration information of the common uplink, implicitly informing the UE to use the common uplink for random access; the UE obtains the time-frequency resource position (including Bandwidth Part indication Bandwidth Part, random access channel resource configuration information) of available random access and the available random access preamble resource (root sequence, cyclic shift value, number of available preamble codes, etc.) from the obtained random access resource configuration;
2) Based on the random access resource configuration information of the supplemental uplink, implicitly informing the UE to use the supplemental uplink for random access; the UE obtains the time-frequency resource location of the available random access (including Bandwidth Part indication Bandwidth Part, random access channel resource configuration information) and the available random access preamble resource (root sequence, cyclic shift value, number of available preambles, etc.) from the obtained random access resource configuration.
In addition, the resource configuration information may further include one of:
3) An indication to the UE of whether to use the normal uplink or the supplemental uplink for random access; and
4) Threshold2 for the UE to determine whether to use the normal uplink or the supplementary uplink for random access. In this case, the UE can determine whether to perform random access using the normal uplink or to perform random access using the supplementary uplink by comparing the RSRP (rsrp_report) of the reported target cell with the threshold2. For example, if rsrp_report > threshold2, the UE selects to use a normal uplink and determines a selected random access resource from corresponding random access resource configuration information; if RSRP_report is less than or equal to threshold2, the UE selects to use the supplemental uplink and determines a selected random access resource from the corresponding random access resource configuration information.
The above-mentioned resource configuration information may be included in resource configuration information configured in system information of its cell by the target cell, which may be used for contention random access by the UE. That is, the above-described resource configuration information may be included in resource configuration information for contention random access transmitted to the UE by the network node. In addition, the above-mentioned resource configuration information may be further included in dedicated random access resource (RACH-configdediated) configuration information that the network node additionally informs the UE.
Thus, if the UE is not configured with dedicated random access resources, it selects random access resources (random access channel and random access preamble) to initiate competitive random access through the configured random access resource configuration information. If the UE is configured with dedicated random access resources, i.e. the UE is configured with explicit random access resources (specific random access channels and/or specific random access preambles), it initiates random access using the configured dedicated random access resources. The threshold2 for determining whether to select the normal uplink or the supplemental uplink may be put into dedicated random access resource (RACH-configdedided) configuration information as follows:
after receiving the above-mentioned resource configuration information from the network node, the UE may acquire a random access resource configuration and indication and perform random access in the target cell based on the random access resource configuration and indication in step S440. For the above cases 1), 2) and 3), the UE performs random access according to the normal uplink or the supplementary uplink indicated by the network node. For case 4 above), the UE selects a corresponding random resource configuration (i.e., normal uplink or supplemental uplink) by itself according to the threshold value threshold2 included in the resource configuration information transmitted by the network node, and determines the random resource to be used. In one exemplary embodiment, upon random access when the UE actually performs handover, the UE may perform new downlink measurement on the target cell and obtain a new RSRP (rsrp_last), and the rsrp_last is not necessarily the same as rsrp_report. At this time, if rsrp_last > threshold2, the UE selects to use a normal uplink and determines a selected random access resource from the corresponding random access resource configuration information; if RSRP_last is less than or equal to threshold2, the UE selects to use the supplemental uplink and determines the selected random access resource from the corresponding random access resource configuration information.
In addition, the handover command sent by the network node to the UE may further include: mapping relation between SSB reported by UE and corresponding random access resource; or mapping relation between CSI-RS reported by UE and corresponding random access resource. Therefore, after the UE selects one SSB or CSI-RS, the available random access resources can be found through the mapping relationship with the corresponding random access resources. The manner in which the UE selects the random access channel according to the exemplary embodiment of the present disclosure has been described in detail above with reference to fig. 3, and will not be described here again.
A schematic structure of an apparatus according to an exemplary embodiment of the present disclosure will be described below with reference to fig. 5. Fig. 5 is a schematic structural view of an apparatus 500 according to an exemplary embodiment of the present disclosure. The apparatus 500 may be used to perform the methods 200 and 400 described with reference to fig. 2 and 4. For brevity, the schematic structure of the apparatus according to the exemplary embodiments of the present disclosure will be described herein, and details that have been detailed in the methods as previously described with reference to fig. 2 and 4 will be omitted.
As shown in fig. 5, the device 500 may include a communication interface 501 for external communication; a processing unit or processor 503, which processor 503 may be a single unit or a combination of units for performing the different steps of the method; memory 505 having stored therein computer executable instructions.
According to a first exemplary embodiment, the instructions, when executed by the processor 503, cause the processor 503 to: receiving a measurement report on a signal to the target cell from the user equipment UE (as described in step S210, which is not described here); based on the measurement report, a handover command including resource configuration information for random access is transmitted to the UE (as described in step S220, which is not described here). As such, the apparatus 500 may be embodied as a network node that performs the method 200 as previously described with reference to fig. 2.
According to a second exemplary embodiment, the instructions, when executed by the processor 503, cause the processor 503 to: the measurement is performed on the signal of the target cell (as described in step S410, which is not repeated here); transmitting a measurement report on the signal of the target cell to the network node corresponding to the serving cell (as described in step S420, which is not repeated here); receiving a handover command including resource configuration information for random access from the network node (as described in step S430, which is not described here); and performing random access in the target cell based on the resource configuration information (as described in step S440, which is not described here). As such, the apparatus 500 may be embodied as a User Equipment (UE) that performs the method 400 as previously described with reference to fig. 4.
Messaging between devices according to a method of an exemplary embodiment of the present disclosure is described below with reference to fig. 6.
Fig. 6 shows a signal flow diagram between devices to which a method 600 according to an exemplary embodiment of the present disclosure is applied.
In step S610, a User Equipment (UE) performs measurement for a signal of a target cell. The measurement may be a measurement of Reference Signal Received Power (RSRP) of the target cell based on a Synchronization Signal Block (SSB) of the target cell or a configured channel state information reference signal (CSI-RS).
Thereafter, in step S620, the UE transmits a report of the measurement, e.g., RSRP value of the measured target cell, to the network node through the uplink channel.
In step S630, the network node reads a measurement report from the UE and determines that the UE needs to be handed over from the serving cell to the target cell based on the measurement report. The determination regarding the switching operation has been described in detail in the above first and second exemplary embodiments, and will not be described again here.
In case the network node determines that a handover operation needs to be performed on the UE, the network node sends a handover command to the UE through a downlink channel in step S640. In the handover command, the network node informs the UE of resource configuration information for random access. When there are multiple uplinks (i.e., all have random access resource configurations) that can be randomly accessed in the target cell, the target cell is exemplified by the presence of a normal uplink for UEs with better channel state conditions and a supplemental uplink for UEs with worse channel state conditions. When the UE reports the measured RSRP value, the UE does not know the threshold value threshold2 of the target cell used to determine whether to select the normal uplink or the supplementary uplink, and thus the UE cannot determine the configuration information of the random access resource to be used.
Thus, the resource configuration information notified to the UE by the network node according to an exemplary embodiment of the present disclosure may comprise one of:
1) Based on random access resource configuration information of the common uplink, implicitly informing the UE to use the common uplink for random access; the UE obtains the time-frequency resource position (including Bandwidth Part indication Bandwidth Part, random access channel resource configuration information) of available random access and the available random access preamble resource (root sequence, cyclic shift value, number of available preamble codes, etc.) from the obtained random access resource configuration;
2) Based on the random access resource configuration information of the supplemental uplink, implicitly informing the UE to use the supplemental uplink for random access; the UE obtains the time-frequency resource location of the available random access (including Bandwidth Part indication Bandwidth Part, random access channel resource configuration information) and the available random access preamble resource (root sequence, cyclic shift value, number of available preambles, etc.) from the obtained random access resource configuration.
In addition, the resource configuration information may further include one of:
3) An indication to the UE of whether to use the normal uplink or the supplemental uplink for random access; and
4) Threshold2 for the UE to determine whether to use the normal uplink or the supplementary uplink for random access. In this case, the UE can determine whether to perform random access using the normal uplink or to perform random access using the supplementary uplink by comparing the RSRP (rsrp_report) of the reported target cell with the threshold2. For example, if rsrp_report > threshold2, the UE selects to use a normal uplink and determines a selected random access resource from corresponding random access resource configuration information; if RSRP_report is less than or equal to threshold2, the UE selects to use the supplemental uplink and determines a selected random access resource from the corresponding random access resource configuration information.
The above-mentioned resource configuration information may be included in resource configuration information configured in system information of its cell by the target cell, which may be used for contention random access by the UE. That is, the above-described resource configuration information may be included in resource configuration information for contention random access transmitted to the UE by the network node. In addition, the above-mentioned resource configuration information may be further included in dedicated random access resource (RACH-configdediated) configuration information that the network node additionally informs the UE.
After receiving the above-mentioned resource configuration information from the network node, the UE may acquire a random access resource configuration and indication from the resource configuration information in step S650. For the above cases 1), 2) and 3), the UE performs random access according to the normal uplink or the supplementary uplink indicated by the network node. For case 4 above), the UE selects a corresponding random resource configuration (i.e., normal uplink or supplemental uplink) by itself according to the threshold value threshold2 included in the resource configuration information transmitted by the network node, and determines the random resource to be used.
According to the technical scheme, when the UE performs the switching operation, the target cell is measured first, the measurement result is fed back to the network node of the serving cell, the network node judges whether the switching is performed or not, and the UE is informed of the random access resource configuration information of the target cell, wherein the network node can directly determine the uplink and the corresponding random access resource configuration information of the uplink, or the network node informs the UE of all available uplinks and the corresponding random access resource configuration information and the corresponding judgment threshold value, and the UE determines the selected uplinks and the corresponding random access resource configuration information. In addition, when there is a certain time interval from the UE obtaining the above-mentioned resource configuration information to the UE actually starting to switch random access, the UE may select uplink and its corresponding random access resource using the latest measurement result. Thus, the UE can select the most accurate uplink in time for random access.
As will be appreciated by those skilled in the art, the program running on the apparatus according to the present disclosure may be a program for causing a computer to realize the functions of the embodiments of the present disclosure by controlling a Central Processing Unit (CPU). The program or information processed by the program may be temporarily stored in a volatile store such as a random access memory RAM, a Hard Disk Drive (HDD), a nonvolatile store such as a flash memory, or other memory system.
A program for realizing the functions of the embodiments of the present disclosure may be recorded on a computer-readable recording medium. The corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs. The term "computer system" as used herein may be a computer system embedded in the device and may include an operating system or hardware (e.g., peripheral devices). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium in which a program is stored dynamically at a short time, or any other recording medium readable by a computer.
The various features or functional modules of the apparatus used in the embodiments described above may be implemented or performed by circuitry (e.g., single-chip or multi-chip integrated circuits). Circuits designed to perform the functions described herein may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies are presented as an alternative to existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.
As above, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above-described embodiments, and the present disclosure also includes any design modifications without departing from the gist of the present disclosure. In addition, various modifications can be made to the present disclosure within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the present disclosure. Further, the components having the same effects described in the above embodiments may be replaced with each other.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (29)
1. A method performed by a user equipment, UE, in a wireless communication system, the method comprising:
Measuring a signal of a target cell;
transmitting a measurement report on signals of the target cell to a network node;
receiving a handover command including resource configuration information from the network node; and
performing random access to the target cell based on the resource configuration information,
wherein the resource configuration information comprises random access resource configuration information based on a normal uplink or a supplemental uplink, and the random access resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
2. A method performed by a user equipment, UE, in a wireless communication system, the method comprising:
measuring a signal of a target cell;
transmitting a measurement report on signals of the target cell to a network node;
receiving a handover command including resource configuration information from the network node; and
performing random access to the target cell based on the resource configuration information,
wherein the resource configuration information comprises random access resource configuration information based on a normal uplink or a supplemental uplink, and the resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
Wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
3. The method of claim 2, wherein the dedicated random access resource configuration information comprises a threshold for selecting CSI-RS.
4. A method performed by a network node in a wireless communication system, the method comprising:
receiving a measurement report on a signal of a target cell from a user equipment UE; and
transmitting a handover command including resource configuration information to the UE based on the measurement report,
wherein the resource configuration information comprises random access resource configuration information based on a normal uplink or a supplemental uplink, and the random access resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
5. A method performed by a network node in a wireless communication system, the method comprising:
receiving a measurement report on a signal of a target cell from a user equipment UE; and
Transmitting a handover command including resource configuration information to the UE based on the measurement report,
wherein the resource configuration information comprises random access resource configuration information based on a normal uplink or a supplemental uplink, and the resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
6. The method of claim 5, wherein the dedicated random access resource configuration information comprises a threshold for selecting CSI-RS.
7. A user equipment, comprising:
a communication interface configured to communicate;
a processor; and
a memory storing computer executable instructions that, when executed by the processor, cause the processor to:
measuring a signal of a target cell;
transmitting a measurement report on signals of the target cell to a network node;
receiving a handover command including resource configuration information from the network node; and
performing random access to the target cell based on the resource configuration information,
Wherein the resource configuration information comprises random access resource configuration information based on a normal uplink or a supplemental uplink, and the random access resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the resource configuration information comprises an indication to the user equipment indicating whether to use a normal uplink or a supplementary uplink for random access.
8. A user equipment, comprising:
a communication interface configured to communicate;
a processor; and
a memory storing computer executable instructions that, when executed by the processor, cause the processor to:
measuring a signal of a target cell;
transmitting a measurement report on signals of the target cell to a network node;
receiving a handover command including resource configuration information from the network node; and
performing random access to the target cell based on the resource configuration information, wherein the resource configuration information includes random access resource configuration information based on a normal uplink or a supplemental uplink, and the resource configuration information includes dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
Wherein the resource configuration information comprises an indication to the user equipment indicating whether to use a normal uplink or a supplementary uplink for random access.
9. The user equipment of claim 8, wherein the dedicated random access resource configuration information comprises a threshold for selecting CSI-RS.
10. A network node, comprising:
a communication interface configured to communicate;
a processor; and
a memory storing computer executable instructions that, when executed by the processor, cause the processor to:
receiving a measurement report on a signal of a target cell from a user equipment UE; and
transmitting a handover command including resource configuration information to the UE based on the measurement report,
wherein the resource configuration information includes random access resource configuration information based on a normal uplink or a supplementary uplink, and
wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
11. A network node, comprising:
a communication interface configured to communicate;
a processor; and
A memory storing computer executable instructions that, when executed by the processor, cause the processor to:
receiving a measurement report on a signal of a target cell from a user equipment UE; and
transmitting a handover command including resource configuration information to the UE based on the measurement report,
wherein the resource configuration information comprises random access resource configuration information based on a normal uplink or a supplemental uplink, and the random access resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
12. The network node of claim 11, wherein the dedicated random access resource configuration information comprises a threshold for selecting CSI-RS.
13. A network node, comprising:
a communication interface configured to communicate;
a processor; and
a memory storing computer executable instructions that, when executed by the processor, cause the processor to:
Receiving a measurement report on a signal of a target cell from a user equipment UE; and
transmitting a handover command including resource configuration information to the UE based on the measurement report,
wherein the resource configuration information comprises random access resource configuration information based on a normal uplink or a supplemental uplink, and the resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
14. The network node of claim 13, wherein the dedicated random access resource configuration information comprises a threshold for selecting CSI-RS.
15. A method performed by a user equipment, UE, in a wireless communication system, the method comprising:
measuring a signal of a target cell;
transmitting a measurement report on signals of the target cell to a network node;
receiving a handover command from the network node comprising resource configuration information including random access resource configuration information indicating that random access is performed on one of a normal uplink or a supplementary uplink; and
Performing random access to the target cell based on the resource configuration information,
wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
16. A method performed by a user equipment, UE, in a wireless communication system, the method comprising:
measuring a signal of a target cell;
transmitting a measurement report on signals of the target cell to a network node;
receiving a handover command from the network node comprising resource configuration information, the resource configuration information comprising random access resource configuration information indicating that random access is performed on one of a normal uplink or a supplementary uplink, and the resource configuration information comprising dedicated random access resource configuration information associated with a synchronization signal block SSB; and
performing random access to the target cell based on the resource configuration information,
wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
17. The method of claim 16, wherein the dedicated random access resource configuration information comprises a threshold for selecting SSBs.
18. The method according to claim 16,
wherein the random access resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the dedicated random access resource configuration information includes a threshold for selecting CSI-RS.
19. A method performed by a network node in a wireless communication system, the method comprising:
receiving a measurement report on a signal of a target cell from a user equipment UE; and
transmitting a handover command including resource configuration information including random access resource configuration information indicating that random access is performed on one of a normal uplink or a supplementary uplink to the UE based on the measurement report,
wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
20. A method performed by a network node in a wireless communication system, the method comprising:
receiving a measurement report on a signal of a target cell from a user equipment UE; and
transmitting a handover command including resource configuration information to the UE based on the measurement report, the resource configuration information including random access resource configuration information indicating that random access is performed on one of a normal uplink or a supplementary uplink, and the resource configuration information including dedicated random access resource configuration information associated with a synchronization signal block SSB,
Wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
21. The method of claim 20, wherein the dedicated random access resource configuration information comprises a threshold for selecting SSBs.
22. The method according to claim 20,
wherein the random access resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the dedicated random access resource configuration information includes a threshold for selecting CSI-RS.
23. A user equipment, comprising:
a communication interface configured to communicate;
a processor; and
a memory storing computer executable instructions that, when executed by the processor, cause the processor to:
measuring a signal of a target cell;
transmitting a measurement report on signals of the target cell to a network node;
receiving a handover command from the network node comprising resource configuration information including random access resource configuration information indicating that random access is performed on one of a normal uplink or a supplementary uplink; and
Performing random access to the target cell based on the resource configuration information,
wherein the resource configuration information comprises an indication to the user equipment indicating whether to use a normal uplink or a supplementary uplink for random access.
24. A user equipment, comprising:
a communication interface configured to communicate;
a processor; and
a memory storing computer executable instructions that, when executed by the processor, cause the processor to:
measuring a signal of a target cell;
transmitting a measurement report on signals of the target cell to a network node;
receiving a handover command from the network node comprising resource configuration information, the resource configuration information comprising random access resource configuration information indicating that random access is performed on one of a normal uplink or a supplementary uplink, and the resource configuration information comprising dedicated random access resource configuration information associated with a synchronization signal block SSB; and
performing random access to the target cell based on the resource configuration information,
wherein the resource configuration information comprises an indication to the user equipment indicating whether to use a normal uplink or a supplementary uplink for random access.
25. The user equipment of claim 24, wherein the dedicated random access resource configuration information comprises a threshold for selecting SSBs.
26. The user equipment according to claim 24,
wherein the random access resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the dedicated random access resource configuration information includes a threshold for selecting CSI-RS.
27. A network node, comprising:
a communication interface configured to communicate;
a processor; and
a memory storing computer executable instructions that, when executed by the processor, cause the processor to:
receiving a measurement report on a signal of a target cell from a user equipment UE; and
transmitting a handover command including resource configuration information to the UE based on the measurement report, the resource configuration information including random access resource configuration information indicating that random access is performed on one of a normal uplink or a supplementary uplink, and the resource configuration information including dedicated random access resource configuration information associated with a synchronization signal block SSB,
Wherein the resource configuration information includes an indication to the UE of whether to use a normal uplink or a supplemental uplink for random access.
28. The network node of claim 27, wherein the dedicated random access resource configuration information comprises a threshold for selecting SSBs.
29. The network node of claim 27,
wherein the random access resource configuration information comprises dedicated random access resource configuration information associated with a channel state information reference signal, CSI-RS, and
wherein the dedicated random access resource configuration information includes a threshold for selecting CSI-RS.
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| PCT/KR2018/003870 WO2018182385A1 (en) | 2017-04-01 | 2018-04-02 | Random access method, network node and user equipment |
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| US17/372,152 US11736989B2 (en) | 2017-04-01 | 2021-07-09 | Random access method, network node and user equipment |
| US18/335,751 US20230328597A1 (en) | 2017-04-01 | 2023-06-15 | Random access method, network node and user equipment |
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| CN112839388A (en) * | 2020-12-31 | 2021-05-25 | 上海擎昆信息科技有限公司 | Method and system for selecting network access mode |
| CN116471702A (en) * | 2022-01-11 | 2023-07-21 | 维沃移动通信有限公司 | Information transmission method, device, terminal and network side equipment |
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