CN110933718A - Method and device for determining PRACH (physical random Access channel) resources, storage medium and terminal - Google Patents
Method and device for determining PRACH (physical random Access channel) resources, storage medium and terminal Download PDFInfo
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Abstract
A method and a device for determining PRACH resources, a storage medium and a terminal are provided, wherein the determining method comprises the following steps: determining a plurality of PRACH BWPs in a serving cell, wherein the PRACH BWPs are UL BWPs containing PRACH resources; when the plurality of PRACH BWPs include more than 2 activated PRACH BWPs, selecting one activated PRACH BWP from the plurality of PRACH BWPs for performing random access. By the technical scheme provided by the invention, the UE can execute random access when a plurality of active BWPs exist and a plurality of PRACH resources exist.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for determining PRACH resources, a storage medium, and a terminal.
Background
With the development of wireless communication technology, the 3rd generation partnership Project (3 GPP) introduced New Radio (NR) technology. Version 15 of NR (Release 15, R15 for short) introduces a new concept BandWidth Part (BWP for short). BWP refers to a subset of the entire cell bandwidth. For each serving cell, a base station may configure one or more BWPs for a connected User Equipment (UE), but only one BWP is activated at most at the same time.
For 3GPP R16 or later releases, at the same time, a UE may have multiple UpLink (UL) BWPs in active state in each cell, and the UE may perform random Access based on each active UL BWP configured with Physical Random Access CHannel (PRACH) resources. At this time, how to select PRACH resources, the prior art does not provide a related technical solution.
Disclosure of Invention
The technical problem solved by the invention is how to determine the PRACH resource for executing random access when a plurality of active state BWPs exist and the active state containing the PRACH resource is a plurality.
In order to solve the above technical problem, an embodiment of the present invention provides a method for determining PRACH resources, where the method for determining PRACH resources includes: determining a plurality of PRACH BWPs in a serving cell, wherein the PRACH BWPs are activated UL BWPs containing PRACH resources; when the plurality of PRACH BWPs include more than 2 activated PRACH BWPs, selecting one activated PRACH BWP from the plurality of PRACHBWPs for performing random access.
Optionally, the selecting an active PRACH BWP from the plurality of PRACH BWPs includes: receiving the priority of the PRACH BWP configured by the network; and selecting the activated PRACH BWP with the highest priority from the plurality of PRACH BWPs according to the sequence of the priorities from high to low.
Optionally, the selecting an active PRACH BWP with a high priority from the plurality of PRACH BWPs includes: and for the plurality of PRACH BWPs, when a plurality of activated PRACH BWPs with the highest priority exist, randomly selecting one activated PRACH BWP from the plurality of activated PRACH BWPs with the highest priority.
Optionally, the selecting an activated PRACH BWP with a highest priority from the multiple PRACH BWPs includes: for each activated state PRACH BWP, determining the ID of the activated state PRACH BWP, and if the serving cell has an activated state DL BWP with the same ID as the ID of the PRACH BWP, taking the activated state PRACH BWP as a candidate PRACH BWP; and sequencing the candidate PRACH BWPs according to the priority, and selecting the candidate PRACH BWP with the highest priority.
Optionally, the selecting the candidate PRACH BWP with the highest priority includes: when a plurality of candidate PRACHBWPs with the highest priority exist, one candidate PRACHBWP with the highest priority is randomly selected or the PRACHBWP with the smallest ID in the candidate PRACHBWPs with the highest priority is selected.
Optionally, the selecting an active PRACH BWP from the plurality of PRACH BWPs includes: receiving the sequence of the PRACH BWP configured by the network; and according to the arrangement sequence of the PRACH BWPs, taking the PRACHBWP in the first order as the selected BWP.
Optionally, the selecting an active PRACH BWP from the plurality of PRACH BWPs includes: determining a selection criterion for the plurality of PRACH BWPs; based on the selection criterion, selecting an activated PRACH BWP from the plurality of PRACH BWPs; the selection criterion is selected from one or more of the following combinations: preferentially selecting the activated state PRACH BWP with the largest subcarrier interval, preferentially selecting the activated state PRACH BWP with the largest bandwidth, preferentially selecting the activated state PRACH BWP with the largest number of activated state PRACH opportunities associated with a single SSB, preferentially selecting the activated state PRACH BWP with the best wireless signal quality, preferentially selecting the activated state PRACH BWP with the highest random access success rate, preferentially selecting the activated state PRACH BWP capable of sending a lead code earliest, preferentially selecting the activated state PRACH BWP with the smallest ID, preferentially selecting the activated state PRACH BWP with the largest ID, and preferentially selecting any activated state PRACH BWP with the same ID as that of the activated state DLBWP.
In order to solve the foregoing technical problem, an embodiment of the present invention further provides a device for determining a PRACH resource, where the device for determining a PRACH resource includes: a determining module adapted to determine a plurality of PRACH BWPs, the PRACH BWPs being active UL BWPs comprising PRACH resources; a selecting module, adapted to select one activated PRACH BWP from the plurality of PRACH BWPs for performing random access when the plurality of PRACH BWPs include more than 2 activated PRACH BWPs.
In order to solve the above technical problem, an embodiment of the present invention further provides a storage medium, where computer instructions are stored, and when the computer instructions are executed, the steps of the method for determining PRACH resources are performed.
In order to solve the foregoing technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores a computer instruction that can be executed on the processor, and the processor executes the steps of the method for determining PRACH resources when executing the computer instruction.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method for determining PRACH resources, which comprises the steps of determining a plurality of PRACH BWPs in a serving cell, wherein the PRACH BWPs are UL BWPs containing PRACH resources; when the plurality of PRACH BWPs include more than 2 activated PRACH BWPs, selecting one activated PRACH BWP from the plurality of PRACH BWPs for performing random access. When there are multiple active BWPs including PRACH resources, according to the technical solution provided by the embodiment of the present invention, one PRACH BWP may be selected to obtain a PRACH resource for performing random access.
Further, the selecting an active PRACH BWP from the plurality of PRACH BWPs comprises: receiving the priority of the PRACH BWP configured by the network; and selecting the activated PRACH BWP with the highest priority from the plurality of PRACH BWPs according to the sequence of the priorities from high to low. Through the technical scheme provided by the embodiment of the invention, the UE can determine the activated UL BWP for executing the random access according to the received priority of each PRACH BWP, thereby providing possibility for executing the random access.
Further, the selecting an active PRACH BWP from the plurality of PRACH BWPs comprises: receiving the sequence of the PRACH BWP configured by the network; and according to the arrangement sequence of the PRACH BWPs, taking the PRACHBWP in the first order as the selected BWP. Through the technical scheme provided by the embodiment of the invention, the UE can select the UL BWP according to the sequence of the PRACH BWP which is configured by the network and executes the random access, and further provides support for determining the UL BWP which executes the random access.
Further, the selecting an active PRACH BWP from the plurality of PRACH BWPs comprises: determining a selection criterion for the plurality of PRACH BWPs; based on the selection criterion, selecting an activated PRACH BWP from the plurality of PRACH BWPs; the selection criterion is selected from one or more of the following combinations: preferentially selecting the activated state PRACH BWP with the largest subcarrier interval, preferentially selecting the activated state PRACH BWP with the largest bandwidth, preferentially selecting the activated state PRACH BWP with the largest number of activated state PRACH opportunities associated with a single SSB, preferentially selecting the activated state PRACH BWP with the best wireless signal quality, preferentially selecting the activated state PRACH BWP with the highest random access success rate, preferentially selecting the activated state PRACH BWP capable of sending a lead code earliest, preferentially selecting the activated state PRACH BWP with the smallest ID, preferentially selecting the activated state PRACH BWP with the largest ID, and preferentially selecting any activated state PRACH BWP with the same ID as that of the activated state DLBWP. By the technical scheme provided by the embodiment of the invention, the UE can select the PRACH resource from the PRACH BWP capable of executing random access in a self-defined way, and further provides support for determining the UL BWP executing the random access.
Drawings
Fig. 1 is a flowchart illustrating a method for determining PRACH resources according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an embodiment of step S102 shown in FIG. 1;
FIG. 3 is a schematic flow chart diagram illustrating another embodiment of step S102 shown in FIG. 1;
fig. 4 is a schematic structural diagram of an apparatus for determining PRACH resources according to an embodiment of the present invention.
Detailed Description
As mentioned in the background, when there are multiple active BWPs containing PRACH resources, the prior art solution does not provide how to select BWPs from the multiple BWPs.
Specifically, in NR 15, the UE may configure multiple UL BWPs (e.g., 4 BWPs) for each carrier, with the UE having only one active UL BWP at most.
For example, the UE may send a random access preamble (preamble) in an active state UL BWP with an ID of 1 in a Primary Cell (PCell), and the base station sends a random access response in an active state DL BWP with an ID of 1 in the PCell.
In specific implementation, when the UL BWP in the active state is configured with a Physical Random Access CHannel (PRACH) resource, the UE may perform random access based on the PRACH resource. The connected UE may initiate a Contention Based Random Access (CBRA) on the PCell or a Primary Secondary Cell (PSCell). For CBRA, PRACH resources and preambles are selected by the UE itself.
The scenario in which the UE initiates the CBRA may include a handover scenario, a scenario in which the UE has data to arrive but is out of synchronization in uplink, and the like. For symmetric spectrum, the switching of the uplink and downlink BWP is independent. For asymmetric spectrum, the switching of uplink and downlink BWP is performed simultaneously. The switching between BWPs may be accomplished through Radio Resource Control (RRC) signaling, DCI signaling, or a BWP inactivity timer.
When one serving cell is configured with a BWP inactivity timer, the active BWP of the UE automatically switches to the default BWP (default BWP) configured by the network after the BWP inactivity timer expires.
The base station may inform the UE of switching active BWP through DCI. For PCell, the initial BWP is the BWP for initial access; for SCell/PSCell, the initial BWP is the first BWP (first active BWP) that the UE operates when the SCell is activated in the network configuration.
The embodiment of the invention provides a method for determining PRACH resources, which comprises the steps of determining a plurality of PRACH BWPs of a serving cell, wherein the PRACH BWPs are activated UL BWPs containing PRACH resources; selecting one PRACHBWP from the plurality of PRACH BWPs for performing random access. When there are multiple active BWPs including PRACH resources, according to the technical solution provided in the embodiment of the present invention, one BWP may be selected to obtain a PRACH resource for performing random access.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart illustrating a method for determining PRACH resources according to an embodiment of the present invention. The method for determining the PRACH resources may be applied to the user equipment side, for example, performed by the UE.
Specifically, the determination method may include the steps of:
step S101, determining a plurality of PRACH BWPs of a serving cell, wherein the PRACH BWPs are ULBWPs containing PRACH resources;
step S102, when the plurality of PRACH BWPs include more than 2 active PRACH BWPs, selecting one active PRACH BWP from the plurality of PRACH BWPs for performing random access.
More specifically, the PRACH BWP is an UL BWP including PRACH resources. In step S101, the UE may select an active UL BWP from a plurality of UL BWPs configured by itself. When there are multiple active-state UL BWPs for one serving cell, an active-state UL BWP containing PRACH resources may be selected. Each active UL BWP containing PRACH resources is referred to as a PRACH BWP. When the active UL BWP is multiple, the PRACH BWP may also be multiple. For example, when the number of active UL BWPs is N, the number of PRACH BWPs may be N, 1 ≦ N ≦ N.
In step S102, when there are multiple PRACH BWPs and there are multiple PRACH BWPs in the active state, the UE may select one active PRACH BWP from the multiple PRACH BWPs. After selecting the active PRACH BWP, the UE may perform random access on the active PRACH BWP.
In a specific implementation, the UE may select an active PRACH BWP according to configuration information sent by the base station.
Fig. 2 is a flowchart illustrating an embodiment of step S102 shown in fig. 1. As a non-limiting example, the step S102 may include the steps of:
step S1021, receiving the priority of the PRACH BWP configured by the network;
step S1022, selecting an activated PRACH BWP with the highest priority from the PRACH BWPs according to the order of the priorities from high to low.
Specifically, the base station may send the priority of the PRACH BWP to the UE. In step S1021, the UE may receive a priority of the network configured PRACH BWP. In a specific implementation, the base station may send the priority of each UL BWP to the UE, where each UL BWP includes a PRACH BWP. After receiving the priority of each UL BWP, the UE may obtain the priority of each active PRACH BWP after determining all PRACHBWPs. As a variation, the base station may directly transmit the priority of each PRACH BWP to the UE (i.e., the base station may transmit the priority of each UL BWP configured with PRACH resources to the UE). After receiving the priority of each PRACH BWP, the UE may learn the priority of each PRACH BWP.
For example, the UL BWPs of the UE are 4, and their IDs are 1, 2, 3, and 4, respectively. The priority is arranged from high to low, and the order is BWP1, BWP2, BWP3 and BWP 4. The PRACH BWPs containing PRACH resources are BWP1, BWP3 and BWP 4. In particular, the base station may send the priorities of BWP1, BWP2, BWP3, BWP4 to the UE, and the UE may know that the results of the prioritization of the PRACH BWPs are BWP1, BWP3, BWP 4.
For another example, the number of UL BWPs for the UE is 4, and the IDs are 1, 2, 3, and 4, respectively. The priority is arranged from high to low, and the order is BWP1, BWP2, BWP3 and BWP 4. The BWPs containing PRACH resources are BWP1, BWP3 and BWP4, but only BWP1 and BWP3 are in an activated state. In particular implementations, the base station may send the priority of BWP1, BWP3, BWP4 to the UE. After that, the UE may know that the results of ranking the PRACH BWPs from high to low by priority are BWP1, BWP3 and BWP4, and further, select between BWP1 and BWP3 by priority.
As yet another variation, the base station may directly send the priority of each active-state PRACH BWP to the UE. After receiving the priority of each active PRACH BWP, the UE may learn the priority of each active PRACH BWP.
In step S1022, the UE may select an activated PRACH BWP with the highest priority from the plurality of PRACH BWPs in order of the priority from high to low.
For example, there are 4 BWPs for the UE (e.g., BWP1, BWP2, BWP3, BWP4), which include 3 active PRACHBWPs. If the 3 PRACH BWPs are sorted from high to low in priority, the results are BWP1, BWP3 and BWP 4. Then, the UE may choose BWP1 as UL BWP for performing random access and transmit a random access preamble based on PRACH resources of BWP 1.
In a specific implementation, when there are multiple active PRACH BWPs with the highest priority, the UE may randomly select one active PRACH BWP from the multiple active PRACH BWPs, and send a random access preamble on a PRACH resource of the active PRACH BWP.
As a variation, the UE may determine the ID of each active PRACH BWP and the ID of each active DL BWP. Thereafter, the UE may use an active-state PRACH BWP having the same ID as that of a certain active DL BWP as a candidate prachhbwp. After the candidate PRACH BWPs are obtained, the UE may sort the candidate PRACH BWPs in order of priority from high to low, select the PRACH resource of the candidate PRACH BWP with the highest priority, and send the random access preamble.
If there are still more candidate PRACH BWPs with the highest priority, the UE may randomly select a PRACH resource of one of the candidate PRACH BWPs with the highest priority to perform random access.
As a variation, if there are still multiple candidate PRACH BWPs with the highest priority, the UE may further select the PRACH BWP with the smallest ID from the candidate PRACH BWPs with the highest priority, and perform random access based on the RACH resource of the PRACH BWP with the smallest ID.
Those skilled in the art understand that the configuration information of the base station may be transmitted to the UE through RRC signaling. For example, the base station may send the priority of each PRACH BWP for the UE to subsequently perform random access.
When the uplink is out of synchronization, the UE may reserve an active PRACH BWP to transmit a random access preamble on a PRACH resource of the PRACH BWP. Preferably, the UE may determine that the serving cell has PRACH resources and there is an active DL BWP with the same ID as that of the PRACH BWP. Thereafter, the UE may perform random access at the PRACH BWP and may receive a random access response from the DL BWP.
Fig. 3 is a schematic flow chart of another embodiment of step S102 shown in fig. 1. As a non-limiting example, the step S102 may include the steps of:
step S1021', receiving the network configured PRACH BWP arrangement sequence;
and step S1022', according to the sequence of the PRACH BWPs, taking the activated PRACH BWP with the first sequence as the selected BWP.
In a specific implementation, the base station may directly configure the ranking order of the PRACH BWPs for the UE and send the ranking order to the UE. In step S1021', the UE may receive the ranking order of the PRACH BWPs from the base station, and further obtain the ranking order of the activated PRACH BWPs.
As a variation, the base station may also configure an order of active UL BWPs with PRACH resources for the UE, that is, the base station may also configure an order of active UL BWPs for the UE.
In step S1022', the UE may use the first activated PRACH BWP as the PRACH BWP for performing random access according to the received arrangement order of the PRACH BWPs. Thereafter, a random access preamble may be transmitted at the PRACH resource of the active-state PRACH BWP.
In an implementation, the UE may select an active PRACH BWP to perform random access. Specifically, the UE may determine a selection criterion according to an actual situation, and select an active PRACH BWP from the plurality of PRACH BWPs according to the selection criterion, so as to send the random access preamble.
For example, the selection criterion is to preferentially select the activated PRACH BWP with the largest subcarrier spacing. To shorten the time of the random access procedure, the UE may select an active-state PRACH BWP with the largest subcarrier spacing. In NR, the larger the subcarrier interval, the shorter the time slot, so the activated PRACH BWP with the largest subcarrier interval is selected, which can shorten the time of the random access procedure.
For another example, the selection criterion is to preferentially select the activated PRACH BWP with the largest bandwidth. The UE can select BWP with larger bandwidth, and the higher the bandwidth is, the higher the flexibility of the frequency position of the activated PRACH resource can be selected by the UE, which is more beneficial to improving the sending success rate of the random access lead code.
For another example, the selection criterion is to preferentially select an activated PRACH BWP with the largest number of PRACH occasions associated with a single Synchronization Signal Block (SSB). When the UE selects the activated PRACH BWP with a large number of PRACH occasions on a single SSB, it means that the activated PRACH resources are large, collisions are few, and the random access success probability is higher.
For another example, the selection criterion is to preferentially select an activated PRACH BWP with the best wireless signal quality. At this time, the UE may select an active PRACH BWP with a good wireless signal based on the measurement result of the UE, thereby improving the probability of success of random access. The UE performs measurement for DL BWPs, obtains measurement results of different DL BWPs, uses the measurement results as measurement results of UL BWPs with the same ID, and further selects the UL BWP with the best measurement result (i.e. the best wireless signal quality) and configured with PRACH.
For another example, the selection criterion is to preferentially select the activated PRACH BWP with the highest random access success rate. The UE can determine the activated PRACH BWP with the highest success rate according to the success rate of random access of each activated PRACH BWP, and perform random access on the activated PRACH BWP. After each random access, the number of successful or failed random accesses is counted, so as to facilitate the UE to subsequently select the activated PRACH BWP.
In a specific implementation, the selection criterion is to preferentially select the active state PRACHBWP capable of transmitting the preamble earliest. The UE may select the active-state PRACH BWP, which may be the earliest in time domain to transmit the random access preamble, as soon as possible.
In a specific implementation, the selection criterion is to preferentially select any activated PRACH BWP whose ID is the same as that of the activated DL BWP. When the UE selects the active-state PRACH BWP with the same ID as that of the active-state DL BWP, the DL BWP handover can be avoided. For example, the active-state PRACH BWP of the UE includes BWP1(ID 1) and BWP2, DL BWP1 is in the deactivated state, and DL BWP2 is in the activated state. In order for the UE to receive the random access response fed back by the base station, the UE may choose BWP2 to send the random access preamble to avoid DL BWP handover.
Those skilled in the art will understand that the selection criteria may also be to preferentially select the PRACH BWP with the smallest ID or to preferentially select the PRACH BWP with the largest ID.
As a variation, the UE may determine multiple selection criteria according to actual requirements, where the multiple selection criteria are a plurality of combinations of the above selection criteria. For example, the multiple selection criteria is to preferentially select the active PRACH BWP with the same ID as the active DL BWP and a larger subcarrier spacing. At this time, the UE may preferentially select, according to the BWP ID, the active PRACH BWP in which the DL BWP is the same as the ID and the subcarrier interval is larger, and then perform random access on the PRACH resource of the active PRACH BWP.
Those skilled in the art will understand that in practical applications, the multiple selection criteria obtained by more different combinations can be changed to perform random access, and will not be described herein.
Therefore, by the technical solution provided by the embodiment of the present invention, the UE can select the UL BWP for performing random access from the plurality of active BWPs having PRACH resources, so as to provide possibility for successfully transmitting the random access preamble.
Fig. 4 is a schematic structural diagram of a PRACH resource determining apparatus according to an embodiment of the present invention, where the PRACH resource determining apparatus 4 (for simplicity, simply referred to as the determining apparatus 4) may be used on the user equipment side. In particular, the determination means 4 may comprise a determination module 41 and a selection module 42.
More specifically, the determining module 41 is adapted to determine a plurality of PRACH BWPs within a serving cell, the PRACHBWP being an UL BWP containing PRACH resources; the selecting module 42 is adapted to select one active PRACH BWP from the plurality of PRACH BWPs for performing random access when the plurality of PRACH BWPs includes more than 2 active PRACH BWPs.
The selecting module 42 may include: a first receiving submodule 421 adapted to receive a priority of the PRACH BWP configured by the network; the first selecting sub-module 422 is adapted to select, from the plurality of PRACH BWPs, an activated PRACH BWP with a highest priority in an order from a highest priority to a lowest priority.
For the multiple PRACH BWPs, the first selecting sub-module 422 is adapted to randomly select one activated PRACH BWP from the multiple activated PRACH BWPs with the highest priority or select the PRACH BWP with the smallest ID from the candidate PRACH BWPs with the highest priority when there are multiple activated PRACH BWPs with the highest priority.
For each PRACH BWP, the first selecting sub-module 422 is adapted to determine an ID of the active PRACH BWP, and if the serving cell has an active DL BWP with an ID that is the same as the ID of the active PRACH BWP, the active PRACH BWP is used as a candidate PRACH BWP; and the candidate PRACH BWPs are sorted according to the priority, and the candidate PRACH BWP with the highest priority is selected.
In a specific implementation, the first selecting sub-module 422 is adapted to randomly select one candidate PRACH BWP with the highest priority when there are multiple candidate PRACH BWPs with the highest priority.
As a variant, the selection module 42 may comprise: a second receiving submodule 423, adapted to receive an order of the PRACH BWPs configured by the network; the first determining submodule 424 is adapted to take the activated PRACH BWP with the first ordering as the selected BWP according to the ordering order of the PRACH BWPs.
As a further variation, the selecting module 42 may include: a second determination submodule 425 adapted to determine a selection criterion for said plurality of PRACH BWPs; a second selection submodule 426, adapted to select an active PRACH BWP from the plurality of PRACH BWPs based on the selection criterion.
The selection criteria may be selected from a combination of one or more of the following: preferentially selecting the activated state PRACH BWP with the largest subcarrier interval, preferentially selecting the activated state PRACH BWP with the largest bandwidth, preferentially selecting the activated state PRACH BWP with the largest number of PRACH opportunities associated with a single SSB, preferentially selecting the activated state PRACH BWP with the best wireless signal quality, preferentially selecting the activated state PRACHBWP with the highest random access success rate, preferentially selecting the activated state PRACHBWP capable of sending a lead code earliest, preferentially selecting the activated state PRACH BWP with the smallest ID, preferentially selecting the activated state PRACH BWP with the largest ID, and preferentially selecting any activated state PRACH BWP with the same ID as that of the activated state PRACH BWP.
For more details of the operation principle and the operation mode of the determining device 4, reference may be made to the related descriptions in fig. 1 to fig. 3, which are not described herein again.
Further, the embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method technical solution described in the embodiments shown in fig. 1 to fig. 3 is executed. Preferably, the storage medium may include a computer-readable storage medium. The storage medium may include ROM, RAM, magnetic or optical disks, etc.
Further, the embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the technical solutions of the methods in the embodiments shown in fig. 1 to fig. 3 when executing the computer instructions.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for determining PRACH resources is characterized by comprising the following steps:
determining a plurality of PRACH BWPs in a serving cell, wherein the PRACH BWPs are UL BWPs containing PRACH resources;
when the plurality of PRACH BWPs include more than 2 activated PRACH BWPs, selecting one activated PRACH BWP from the plurality of PRACH BWPs for performing random access.
2. The method for determining the PRACH resource of claim 1, wherein the selecting the active PRACH BWP from the plurality of PRACHBWPs comprises:
receiving the priority of the PRACH BWP configured by the network;
and selecting the activated PRACHBWP with the highest priority from the plurality of PRACH BWPs according to the sequence of the priorities from high to low.
3. The method for determining the PRACH resource of claim 2, wherein the selecting the activated PRACH BWP with a high priority from the plurality of PRACHBWPs comprises:
and for the plurality of PRACH BWPs, when a plurality of activated state BWPs with the highest priority exist, randomly selecting one activated state PRACH BWP from the plurality of activated state PRACH BWPs with the highest priority.
4. The method for determining the PRACH resource of claim 2, wherein the selecting the activated PRACH BWP with the highest priority from the plurality of PRACHBWPs comprises:
for each activated state PRACH BWP, determining the ID of the activated state PRACH BWP, and if the serving cell has an activated state DL BWP with the same ID as the ID of the activated state PRACH BWP, taking the activated state PRACH BWP as a candidate PRACHBWP;
and sequencing the candidate PRACH BWPs according to the priority, and selecting the candidate PRACH BWP with the highest priority.
5. The method of determining the PRACH resource of claim 4, wherein the selecting the candidate PRACH BWP with the highest priority comprises:
when a plurality of candidate PRACHBWPs with the highest priority exist, one candidate PRACHBWP with the highest priority is randomly selected or the PRACHBWP with the smallest ID in the candidate PRACHBWP with the highest priority is selected.
6. The method for determining the PRACH resource of claim 1, wherein the selecting the active PRACH BWP from the plurality of PRACHBWPs comprises:
receiving the sequence of the PRACH BWP configured by the network;
and according to the arrangement sequence of the PRACH BWPs, taking the PRACH BWP in the first order as the selected BWP.
7. The method for determining the PRACH resource of claim 1, wherein the selecting the active PRACH BWP from the plurality of PRACHBWPs comprises:
determining a selection criterion for the plurality of PRACH BWPs;
based on the selection criterion, selecting an activated PRACH BWP from the plurality of PRACH BWPs;
the selection criterion is selected from one or more of the following combinations: preferentially selecting the activated PRACHBWP with the largest subcarrier interval, preferentially selecting the activated PRACHBWP with the largest bandwidth, preferentially selecting the activated PRACH BWP with the largest number of PRACH opportunities associated with a single SSB, preferentially selecting the activated PRACH BWP with the best wireless signal quality, preferentially selecting the activated PRACH BWP with the highest random access success rate, preferentially selecting the activated PRACH BWP capable of sending a lead code earliest, preferentially selecting the activated PRACH BWP with the smallest ID, preferentially selecting the activated PRACH BWP with the largest ID, and preferentially selecting any activated PRACH BWP with the same ID as that of the activated DL BWP.
8. An apparatus for determining PRACH resources, comprising:
a determining module adapted to determine a plurality of PRACH BWPs, the PRACH BWPs being UL BWPs comprising PRACH resources;
a selecting module, adapted to select one activated PRACH BWP from the plurality of PRACH BWPs for performing random access when the plurality of PRACH BWPs include more than 2 activated PRACH BWPs.
9. A storage medium having stored thereon computer instructions, wherein the computer instructions are operable to perform the steps of the method for determining PRACH resources according to any one of claims 1 to 7.
10. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method for determining PRACH resources according to any one of claims 1 to 7.
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