CN112954748B - Physical random access channel resource allocation and random access method and equipment - Google Patents
Physical random access channel resource allocation and random access method and equipment Download PDFInfo
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- 238000004590 computer program Methods 0.000 claims description 10
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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Abstract
The invention discloses a physical random access channel resource allocation and random access method and equipment, comprising the following steps: the base station determines the number of terminals to be switched and the switching time; when the number of the terminals and the switching time exceed a preset threshold, reserving large bandwidth uplink resources and/or short period uplink resources as physical random access channel resources for the terminals to initiate random access; and after the switching is finished, releasing the reserved physical random access channel resources. The terminal determines the physical random access channel resource capable of initiating random access, the terminal initiates random access on the special configuration resource of the physical random access channel, and initiates competitive random access on the public configuration resource of the physical random access channel after the disconnection. By adopting the method and the device, the high-capacity terminal can be ensured to be rapidly switched when being switched on the high-speed rail, and the user performance and experience are improved.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a physical random access channel resource allocation method and a random access device.
Background
The resource allocation of the 5G NR (next generation radio ) PRACH (physical random access channel, physical Random Access Channel) is shown in the following table in TR38.211 table 6.3.3.2-3:
firstly, according to IE RACH-ConfigDedimated (RACH special configuration information element; IE: information element, information Element; RACH: random access channel, physical Random Access Channel) in RRC (radio resource control ) reconfiguration message issued by base station, PRACH sequence number is obtained by PRACH-configuration index defined by information RACH-ConfigGeneric (RACH configuration generalization). Fig. 1 is a schematic diagram of a PRACH configuration mode, and a PRACH sequence number corresponds to a PRACH selection process as shown in the figure.
The terminal acquires PRACH-configuration index through RRC reconfiguration information and PRACH time domain location information. According to PRACH serial number SFN (system frame number ) related information, PRACH time domain period 160ms/80ms/40ms/20ms/10ms is obtained, subframe number 0-9 is obtained through Subframe number, PRACH time domain initial position is 0 or 7 is obtained through Starting symbol, PRACH sequence duration length is 1-2 slots is obtained through Number of PRACH slots within a Subframe, PRACH time domain burst number is 1/2/3/6 is obtained through number of time-domain PRACH occasions within a PRACH slot, and PRACH time domain occupied symbol number is 2/4/6/12 symbol is obtained through PRACHduration. Meanwhile, the PRACH-configuration index corresponds to different PRACH formats.
The terminal acquires msg1-subcarrier spacing (message 1-subcarrier spacing), msg1-frequency starting (message 1-starting frequency) and msg1-FDM (message 1-orthogonal frequency division; FDM: frequency division multiplexing, frequency Division Mutiplexing) through RRC reconfiguration message, and acquires the subcarrier spacing, the frequency domain starting position and the frequency division multiplexing mode of PRACH.
The prior art has the following defects: under the existing PRACH resource allocation mechanism, uplink resources are wasted.
Disclosure of Invention
The invention provides a physical random access channel resource allocation and random access method and equipment, which are used for solving the problem of waste of uplink resources under the existing PRACH resource allocation mechanism.
The embodiment of the invention provides a PRACH resource allocation method, which comprises the following steps:
the base station determines the number of terminals to be switched and the switching time;
when the number of the terminals and the switching time exceed a preset threshold, reserving large bandwidth uplink resources and/or short period uplink resources as PRACH resources for the terminals to initiate random access;
and after the switching is finished, releasing the reserved PRACH resources.
In practice, the number of terminals to be switched and the switching time are determined according to the time and the number of MR transmissions from each terminal.
In an implementation, the PRACH resources include:
the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or designates the RACH-ConfigDedic resources through RRC reconfiguration.
In an implementation, further comprising configuring RACH-configdediated resources of the PRACH resources in one or a combination of the following ways:
configuring the use period of PRACH resources to be infinite;
configuring a plurality of PRACH resources for each terminal;
and configuring the use time and the release time of the PRACH resources.
In practice, the usage period of PRACH resource is configured to be infinite, n is SFN X in mod x=y is set to a maximum value.
In the implementation, a plurality of PRACH resources are configured for each terminal, namely a plurality of PRACH-Configuration Index sets are configured for the terminal, and n of each set is defined SFN Y in mod x=y is set to different values, and multiple sets of PRACH resources are configured by RRC configuration ra-accasionlist.
In implementation, the use time and the release time of the PRACH resource are configured by adding MSG1-duration in the RACH-configuration gene in the IERACH-ConfigDedioded, wherein the MSG1-duration is the use time of the MSG1, the starting time point of the MSG1-duration is the time point when the terminal sends the MSG for the first time, and the PRACH corresponding to the MSG1-duration is released after exceeding the use time of the MSG 1.
In implementation, RACH-ConfigCommon resources in the PRACH resources are used for contention random access after terminal disconnection.
In practice, further comprising:
after receiving msg1 sent by the terminal in the same sequence at each burst position of the subframe, diversity gain is performed.
In implementation, the time-frequency domain resource of the PRACH resource is:
the time domain of the uplink time slot is full, or each time slot occupies half of the resources;
and 8 frequency-division are carried out on the frequency domain, and meanwhile, 4 to 8 sets of different PRACH resources are obtained according to msg 1-FrequencyStart.
In practice, further comprising:
grouping the PRACH resources;
each terminal is assigned to a different PRACH resource group.
In practice, fdm=8 for each PRACH resource group, and each resource block contains 40 to 50 non-contention resolution sequences.
The embodiment of the invention provides a random access method, which comprises the following steps:
the terminal determines PRACH resources capable of initiating random access, wherein the PRACH resources comprise: the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or the RACH-ConfigDedic resources determined by the terminal through RRC reconfiguration;
and the terminal initiates random access on the RACH-ConfigDedimated resource, and initiates competitive random access on the RACH-ConfigCommon resource after the disconnection.
In practice, the terminal initiates random access on said RACH-ConfigDedicated resources in one of or a combination of the following ways:
when the service period of the PRACH resource is configured to be infinite, the PRACH resource is accessed in an RRC reconnection mode after the access failure;
when a terminal is configured with a plurality of PRACH resources, after one PRACH resource fails to access, initiating random access in the next PRACH resource;
when the PRACH resource is configured with the use time and the release time, the PRACH resource is accessed by an RRC reconnection mode after the access failure.
In practice, the terminal is in determining n SFN When x in mod x=y is set to a maximum value, it is determined that the use period of the PRACH resource is configured to be infinite.
In the implementation, the terminal determines that a plurality of PRACH resources are configured for the terminal according to the ra-OccasionList configured by the RRC;
when the terminal initiates random access to each PRACH resource, the terminal is divided into n according to each PRACH resource SFN Y in mod x=y initiates random access.
In implementation, when the terminal determines that the use time and the MSG1-duration of the configured PRACH exist in the RACH-configgenerics in the IE RACH-ConfigDedicated, it determines that the PRACH resource is configured with the use time and the release time, where the MSG1-duration is the use time of the MSG1, and the starting time point of the MSG1-duration is the time point when the terminal first sends the MSG, and releases the PRACH corresponding to the MSG1-duration after exceeding the use time of the MSG 1.
In practice, further comprising:
the terminal adopts msg1 sent by the same sequence at each burst position of the subframe.
The embodiment of the invention provides a base station, which comprises:
a processor for reading the program in the memory, performing the following process:
determining the number of terminals to be switched and the switching time;
when the number of the terminals and the switching time exceed a preset threshold, reserving large bandwidth uplink resources and/or short period uplink resources as PRACH resources for the terminals to initiate random access;
releasing the reserved PRACH resources after the switching is finished;
and a transceiver for receiving and transmitting data under the control of the processor.
In practice, the number of terminals to be switched and the switching time are determined according to the time and the number of MR transmissions from each terminal.
In an implementation, the PRACH resources include:
the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or designates the RACH-ConfigDedic resources through RRC reconfiguration.
In an implementation, further comprising configuring RACH-configdediated resources of the PRACH resources in one or a combination of the following ways:
configuring the use period of PRACH resources to be infinite;
Configuring a plurality of PRACH resources for each terminal;
and configuring the use time and the release time of the PRACH resources.
In practice, the usage period of PRACH resource is configured to be infinite, n is SFN X in mod x=y is set to a maximum value.
In the implementation, a plurality of PRACH resources are configured for each terminal, namely a plurality of PRACH-Configuration Index sets are configured for the terminal, and n of each set is defined SFN Y in mod x=y is set to different values, and multiple sets of PRACH resources are configured by RRC configuration ra-accasionlist.
In implementation, the use time and the release time of the PRACH resource are configured by adding MSG1-duration in the RACH-configuration gene in the IERACH-ConfigDedioded, wherein the MSG1-duration is the use time of the MSG1, the starting time point of the MSG1-duration is the time point when the terminal sends the MSG for the first time, and the PRACH corresponding to the MSG1-duration is released after exceeding the use time of the MSG 1.
In implementation, RACH-ConfigCommon resources in the PRACH resources are used for contention random access after terminal disconnection.
In practice, further comprising:
after receiving msg1 sent by the terminal in the same sequence at each burst position of the subframe, diversity gain is performed.
In implementation, the time-frequency domain resource of the PRACH resource is:
the time domain of the uplink time slot is full, or each time slot occupies half of the resources;
and 8 frequency-division are carried out on the frequency domain, and meanwhile, 4 to 8 sets of different PRACH resources are obtained according to msg 1-FrequencyStart.
In practice, further comprising:
grouping the PRACH resources;
each terminal is assigned to a different PRACH resource group.
In practice, fdm=8 for each PRACH resource group, and each resource block contains 40 to 50 non-contention resolution sequences.
The embodiment of the invention provides a base station, which comprises:
the determining module is used for determining the number of terminals to be switched and the switching time;
the reservation module is used for reserving large bandwidth uplink resources and/or short period uplink resources as PRACH resources for the terminal to initiate random access when the number of the terminals and the switching time exceed preset thresholds;
and the release module is used for releasing the reserved PRACH resources after the switching is finished.
In implementation, the determining module is further configured to determine the number of terminals to be switched and the switching time according to the time and the number of MR transmissions of each terminal.
In implementation, the reservation module is further configured to reserve RACH-ConfigCommon resources obtained by the terminal by listening to the cell MIB and/or assign RACH-ConfigDedicated resources by RRC reconfiguration.
In practice, the reservation module is further configured to configure RACH-configdedided resources of the PRACH resources in one or a combination of the following ways:
configuring the use period of PRACH resources to be infinite;
configuring a plurality of PRACH resources for each terminal;
and configuring the use time and the release time of the PRACH resources.
In practice, the usage period of PRACH resource is configured to be infinite, n is SFN X in mod x=ySet to a maximum value.
In an implementation, the reservation module is further configured to configure multiple sets of PRACH resources for each terminal, that is, configure multiple sets of PRACH-Configuration Index for the terminal, and n for each set SFN Y in mod x=y is set to different values, and multiple sets of PRACH resources are configured by RRC configuration ra-accasionlist.
In implementation, the reservation module is further configured to configure a use time and a release time of the PRACH resource by adding MSG1-duration to RACH-Config Generic in IE RACH-configdediated, where the MSG1-duration is the use time of MSG1, and a starting time point of the MSG1-duration is a time point when the terminal first sends the MSG, and releases the PRACH corresponding to the MSG1-duration after exceeding the use time of the MSG 1.
In implementation, the reservation module is further configured to reserve RACH-ConfigCommon resources in the PRACH resources for contention random access after terminal disconnection.
In an implementation, the releasing module is further configured to perform diversity gain after receiving msg1 sent by the terminal in the same sequence at each burst position of the subframe.
In implementation, the reservation module is further configured to reserve time-frequency domain resources of the PRACH resource as:
the time domain of the uplink time slot is full, or each time slot occupies half of the resources;
and 8 frequency-division are carried out on the frequency domain, and meanwhile, 4 to 8 sets of different PRACH resources are obtained according to msg 1-FrequencyStart.
In implementations, the reservation module is further to:
grouping the PRACH resources;
each terminal is assigned to a different PRACH resource group.
In practice, fdm=8 for each PRACH resource group, and each resource block contains 40 to 50 non-contention resolution sequences.
The embodiment of the invention provides a terminal, which comprises:
a processor for reading the program in the memory, performing the following process:
determining PRACH resources capable of initiating random access, wherein the PRACH resources comprise: the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or the RACH-ConfigDedic resources determined by the terminal through RRC reconfiguration;
Initiating random access on the RACH-ConfigDedimated resource, and initiating competitive random access on the RACH-ConfigCommon resource after disconnection;
and a transceiver for receiving and transmitting data under the control of the processor.
In practice, random access is initiated on the RACH-ConfigDedicated resource in one or a combination of the following ways:
when the service period of the PRACH resource is configured to be infinite, the PRACH resource is accessed in an RRC reconnection mode after the access failure;
when a terminal is configured with a plurality of PRACH resources, after one PRACH resource fails to access, initiating random access in the next PRACH resource;
when the PRACH resource is configured with the use time and the release time, the PRACH resource is accessed by an RRC reconnection mode after the access failure.
In practice, in determining n SFN When x in mod x=y is set to a maximum value, it is determined that the use period of the PRACH resource is configured to be infinite.
In implementation, determining that the terminal is configured with a plurality of PRACH resources according to the ra-OccasionList configured by RRC;
when each set of PRACH resources initiates random access, n is used for each set SFN Y in mod x=y initiates random access.
In implementation, when determining that there is an MSG1-duration with a use time and a release time for configuring a PRACH in RACH-Config Generic in IE RACH-configdedication, determining that a PRACH resource is configured with a use time and a release time, where the MSG1-duration is the use time of MSG1, and a starting time point of the MSG1-duration is a time point when a terminal first sends an MSG, and releasing a PRACH corresponding to the MSG1-duration after exceeding the use time of the MSG 1.
In practice, further comprising:
msg1 sent with the same sequence at each burst position of the subframe.
The embodiment of the invention provides a terminal, which comprises:
a resource determining module, configured to determine a PRACH resource that can initiate random access, where the PRACH resource includes: the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or the RACH-ConfigDedic resources determined by the terminal through RRC reconfiguration;
and the access module is used for initiating random access on the RACH-ConfigDedimated resource, and initiating competitive random access on the RACH-ConfigCommon resource after the disconnection.
In practice, the access module is further configured to initiate random access on the RACH-ConfigDedicated resource in one of or a combination of the following ways:
when the service period of the PRACH resource is configured to be infinite, the PRACH resource is accessed in an RRC reconnection mode after the access failure;
when a terminal is configured with a plurality of PRACH resources, after one PRACH resource fails to access, initiating random access in the next PRACH resource;
when the PRACH resource is configured with the use time and the release time, the PRACH resource is accessed by an RRC reconnection mode after the access failure.
In practice, the resource determination module is further configured to, in determining n SFN When x in mod x=y is set to a maximum value, it is determined that the use period of the PRACH resource is configured to be infinite.
In implementation, the resource determining module is further configured to determine that the terminal is configured with multiple sets of PRACH resources according to ra-occidionlist configured by RRC;
the access module is further configured to, when each set of PRACH resources initiates random access, determine n for each set SFN Y in mod x=y initiates random access.
In implementation, the resource determining module is further configured to determine that the PRACH resource is configured with a use time and a release time when it is determined that there is an MSG1-duration for configuring the use time and the release time of the PRACH in RACH-configDedioded in the IE RACH-configDedioded, where the MSG1-duration is the use time of the MSG1, and a starting time point of the MSG1-duration is a time point when the terminal first sends the MSG, and release the PRACH corresponding to the MSG1-duration after exceeding the use time of the MSG1.
In an implementation, the access module is further configured to send msg1 with the same sequence at each burst position of the subframe.
Embodiments of the present invention provide a computer readable storage medium storing a computer program for executing the PRACH resource allocation method and/or the random access method described above.
The invention has the following beneficial effects:
in the technical scheme provided by the embodiment of the invention, when the condition that a plurality of terminals similar to a high-speed rail are switched simultaneously is determined according to the number of the terminals and the switching time, the reserved large-bandwidth uplink resources and/or the short-period uplink resources are used as PRACH resources for the terminals to initiate random access, and after the switching is finished, the reserved PRACH resources are released.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a schematic diagram of a PRACH configuration in the background art;
fig. 2 is a schematic flow chart of implementation of a PRACH resource allocation method at a base station side in an embodiment of the present invention;
fig. 3 is a schematic flow chart of implementing a random access method at a terminal side in an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a switching process according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a base station structure according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a terminal structure according to an embodiment of the present invention.
Detailed Description
The inventors noted during the course of the invention that:
at present, the PRACH resources are divided into switching random access resources and non-switching random access resources (such as resident initiation service or dropped re-access), the existing PRACH resource configuration is static configuration, a base station tells a terminal the PRACH resource position through SSB (synchronization signal block ) or RRC reconfiguration information, and the terminal initiates random access by adopting the known PRACH resources when initiating service or switching.
The base station reserves uplink resources for PRACH resources, meets the requirements of switching and accessing scenes at any time when the terminal moves irregularly in a large network environment, and ensures the user experience performance. However, in some special scene environments, such as a high-speed railway scene, the terminal can be switched simultaneously with the movement of the vehicle body under the condition different from the large network, the terminal behavior is regular and circulated, most of the driving time is free of high-speed railway switching users, and preset uplink PRACH resources are adopted for switching access of the terminal, so that great waste is caused to uplink resources, and the uplink performance of the system is affected.
For example, to ensure access performance for a large capacity user, a short-period PRACH resource configuration or a wide-band long-period PRACH resource configuration may be employed. If a short period PRACH configuration (e.g., 10ms 6 PRBs (physical resource block, physical resource block)) is adopted, access performance of the terminal is guaranteed, but fewer access users are needed each time, the waiting time of the users is long (about 200 ms), and the terminal is easy to drop. If the PRACH with long period and large bandwidth is adopted for a larger period (such as 160ms 48 PRBs), the resource cost and the access time delay can be reduced, but the access performance of the terminal is poor, the access waiting time delay and the access waiting time delay after the access failure are longer, and the terminal is easy to drop in a high-speed railway scene. If a short period large bandwidth PRACH configuration (e.g., 10ms 48 PRBs) is employed, the PRACH uplink overhead is 20% and the uplink overhead is too large.
Based on this, in the embodiment of the present application, a scheme for dynamically configuring PRACH resources in a scenario represented by high-speed rail is provided, in the scheme, a base station adopts a dynamic PRACH resource configuration mode, when a terminal is switched, dynamically schedules more uplink resources for random access of a large number of terminal PRACHs in a short time, and after the switching is completed, the base station releases the switched PRACH resources for uplink traffic channel transmission. Taking a high-speed rail scene as an example, the switching time delay of a high-capacity user can be reduced, the switching success rate of the high-capacity user is improved, and meanwhile, uplink data transmission is not influenced by resources occupied by a static PRACH.
The following describes specific embodiments of the present invention with reference to the drawings.
In the description process, the implementation of the terminal and the base station will be described separately, and then an example of the implementation of the cooperation of the terminal and the base station will be given to better understand the implementation of the scheme given in the embodiment of the present invention. Such a description does not mean that the two must be implemented cooperatively or separately, and in fact, when the terminal and the base station are implemented separately, they solve the problems of the terminal side and the base station side, respectively, and when the two are used in combination, a better technical effect is obtained.
In the description process, a high-speed rail scene will be mainly taken as an example, and the high-speed rail is taken as an example because the scene is typical and the practical application value is high; however, in theory, the scheme may be used in other scenes, so long as a large number of scenes in which terminals need to be switched simultaneously occur in a short time, so that the high-speed rail scene is only used for teaching a person skilled in the art how to implement the present invention, but not only used for high-speed rails, and the implementation process can be combined with practical needs to be applied to corresponding scenes.
Fig. 2 is a schematic flow chart of implementation of a PRACH resource allocation method at a base station side, and as shown in the drawing, may include:
Step 201, determining the number of terminals to be switched and the switching time;
step 202, when the number of terminals and the switching time exceed a preset threshold, reserving large bandwidth uplink resources and/or short period uplink resources as PRACH resources for the terminals to initiate random access;
step 203, after the handover is finished, releasing the reserved PRACH resources.
Fig. 3 is a schematic flow chart of implementation of a random access method at a terminal side, and as shown in the drawing, may include:
step 301, determining PRACH resources capable of initiating random access, wherein the PRACH resources include: the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or the RACH-ConfigDedic resources determined by the terminal through RRC reconfiguration;
step 302, the terminal initiates random access on the RACH-ConfigDedimated resource, and initiates competitive random access on the RACH-ConfigCommon resource after disconnection.
Specifically, PRACH resources are classified into handover random access resources and other random access resources (e.g., user camping or originating services). In the scheme, dynamic configuration is carried out on the switched random access resources, so that the success of access at any time after the terminal is disconnected is ensured, the non-switched random resources still reserve uplink resources according to the configuration of a large network, and the access performance of the terminal is ensured.
In an implementation, the PRACH resources include:
the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or designates the RACH-ConfigDedic resources through RRC reconfiguration.
Specifically, two sets of PRACH resources are configured, one set of RACH-ConfigCommon (common configuration RACH) and one set of RACH-configdediated (dedicated configuration RACH) resources. The two sets of resources respectively belong to different time-frequency domain positions. RACH-ConfigCommon is obtained by listening to the cell MIB (control information block, master Information Block) and RACH-configdedided is specified by RRC reconfiguration.
RACH-ConfigCommon exists at the whole time, and is configured to fdm=1 with a period of 10ms, and is used for contention access after terminal disconnection, and uplink overhead is 1%.
For the high-speed rail scenario, different resources are configured by the RACH-ConfigDedimated and the RACH-ConfigCommon, so that the cost of the RACH-ConfigDedimated uplink resources at the moment of high capacity can be reduced.
In the implementation, the number of terminals to be handed over and the handover time are determined at the base station side, and may be determined according to the time and the number of MR transmissions from each terminal.
Specifically, in the switching process, the base station determines according to the MR (measurement report, measurment Report) time sent by the user and the number of requested users, if the user is in simultaneous switching of a large-capacity user, the base station reserves PRACH resources, configures short-period PRACH resources for each terminal, configures large-bandwidth PRACH resources for the large-capacity user, releases resources after the configuration is completed, and the base station can use the resources for PUSCH (physical uplink shared channel ) transmission to reduce PRACH uplink overhead. If only occasional individual user handovers are made, the PRACH dedicated resources in RACH-ConfigCommon are employed for individual user handover access.
The configuration of resources is described below
At the base station side, the method may further include configuring RACH-ConfigDedicated resources in the PRACH resources in one of or a combination of the following manners:
configuring the use period of PRACH resources to be infinite;
configuring a plurality of PRACH resources for each terminal;
and configuring the use time and the release time of the PRACH resources.
Correspondingly, on the terminal side, the terminal initiates random access on the RACH-configdediated resource in one of the following manners or a combination thereof:
when the service period of the PRACH resource is configured to be infinite, the PRACH resource is accessed in an RRC reconnection mode after the access failure;
when a terminal is configured with a plurality of PRACH resources, after one PRACH resource fails to access, initiating random access in the next PRACH resource;
when the PRACH resource is configured with the use time and the release time, the PRACH resource is accessed by an RRC reconnection mode after the access failure.
Three modes are specifically described below.
1. The usage period of PRACH resources is configured to be infinite.
On the base station side, the use period of PRACH resources is configured to be infinite, n is as follows SFN X in mod x=y is set to a maximum value.
Correspondingly, on the terminal side, the terminal is in the determination of n SFN When x in mod x=y is set to a maximum value, it is determined that the use period of the PRACH resource is configured to be infinite.
Specifically, with the existing PRACH configuration scheme, the PRACH period is configured to be infinite, i.e., n SFN Setting x to a maximum value at mod x=y, PRACH resources are valid only once, similar to aperiodic transmissions. To indicate that he is non-periodic; wherein n is SFN And x is a PRACH period, SFN0 is used as a starting point, and y is used for calculating the position of the radio frame of the PRACH resource in the PRACH period.
After the scheme is adopted, the terminal can not initiate random access periodically after the first access failure, and can be reconnected through RRC after the link failure, so that the performance of the terminal is not affected.
2. A plurality of sets of PRACH resources are configured for each terminal.
On the base station side, multiple sets of PRACH resources are configured for each terminal, namely multiple sets of PRACH-Configuration Index (PRACH configuration index) are configured for the terminal, and n of each set is determined SFN Y in mod x=y is set to different values, and multiple sets of PRACH resources are configured by RRC configuration ra-accasionlist.
Correspondingly, the terminal side is:
the terminal determines that the terminal is configured with a plurality of PRACH resources according to the ra-OccasionList configured by the RRC;
when the terminal initiates random access to each PRACH resource, the terminal is divided into n according to each PRACH resource SFN Y in mod x=y initiates random access.
Specifically, the terminal may be configured with multiple sets of prach-Configuration Index, n for each set SFN mod x=yy is set to a different value and the terminal attempts random access on other PRACH resources after the first access failure. And configuring a plurality of PRACH resources through RRC configuration ra-OccasionList (random access occasion list).
In practice, the existing PRACH format does not support PRACH period setting of a larger value, so the period value may be set by adding a PRACH format.
For the high-speed rail scenario, the base station and the terminal can support a plurality of sets of RACH-ConfigDedioded resource configurations for switching, and RRC message ra-OccasionList configuration is adopted.
Aiming at a high-speed rail scene, a new PRACH time domain period is configured to be non-periodic, x of the SFN is configured to be a maximum value, a plurality of PRACH resources configured for a terminal are supported, and the purpose that when one PRACH access is unsuccessful, the PRACH resources can be re-accessed on other PRACH resources is achieved.
3. And configuring the use time and the release time of the PRACH resources.
On the base station side, the use time and the release time of PRACH resources are configured by adding MSG1-duration in RACH-configuration genes in IERACH-ConfigDedimatified, wherein the MSG1-duration is the use time of MSG1, the starting time point of the MSG1-duration is the time point of the terminal for sending MSG for the first time, and the PRACH corresponding to the MSG1-duration is released after exceeding the use time of the MSG 1.
Correspondingly, the terminal side is: when the terminal determines that the use time and the release time MSG1-duration for configuring the PRACH exist in the RACH-Config general in the IE RACH-Config Dedioded, determining that the PRACH resource is configured with the use time and the release time, wherein the MSG1-duration is the use time of the MSG1, the starting time point of the MSG1-duration is the time point of the terminal for sending the MSG for the first time, and releasing the PRACH corresponding to the MSG1-duration after exceeding the use time of the MSG 1.
Specifically, an RRC reconfiguration message may be added, and an MSG1-duration is newly added in an RACH-ConfigGeneric of the IE RACH-ConfigDedicated information, which indicates a use time of the MSG1, and an initial time point is a time point when the terminal first sends the MSG (message), and after the initial time point exceeds the MSG1-duration time, the PRACH is used for random resource release of handover, and if the terminal still has not yet been successfully handed over, the terminal may access in an RRC reconnection manner.
For a high-speed rail scene, configuring RACH-ConfigDedimated effective time, configuring MSG1-duration in an RRC reconfiguration message, and when the effective time of MSG1 is kept during switching and the time is over, a base station releases resources for switching by PRACH (physical random access channel) for subsequent uplink resource transmission.
In implementation, at the base station side, the method may further include:
after receiving msg1 sent by the terminal in the same sequence at each burst position of the subframe, diversity gain is performed.
Correspondingly, the terminal side may further include:
the terminal adopts msg1 sent by the same sequence at each burst position of the subframe.
Specifically, if there are 2 burst positions in a subframe, the terminal sends msg1 in each position by adopting the same sequence (sequence), and the base station receives the msg1 and then performs diversity gain to enhance the access performance in the high-speed rail scene.
In implementation, the time-frequency domain resource of the PRACH resource may be:
the time domain of the uplink time slot is full, or each time slot occupies half of the resources;
and 8 frequency-division are carried out on the frequency domain, and meanwhile, 4 to 8 sets of different PRACH resources are obtained according to msg 1-FrequencyStart.
Specifically, the PRACH time-frequency domain resource may be configured as follows:
the PRACH occupies the time domain of the uplink time slot or occupies half of the resources in each time slot, 8 PRACH resources are divided in the frequency domain, and 4-8 sets of different PRACH resources in the frequency domain are obtained according to msg1-FrequencyStart (message 1-starting frequency).
In practice, the method may further comprise:
grouping the PRACH resources;
each terminal is assigned to a different PRACH resource group.
In a specific implementation, fdm=8 for each PRACH resource group, and each resource block includes 40 to 50 non-contention resolution sequences.
Specifically, the base station may group the terminals into different PRACH resource groups according to the sounding transmission sequence, where each group of fdm=8, and each resource block includes 40-50 non-contention resolution sequences.
Aiming at a high-speed rail scene, a base station reserves a plurality of PRACH resources, groups different PRACH resources for a terminal according to the measurement and report time of the terminal, ensures staggered access of the terminal, improves the success rate of access, and reduces the waiting time delay of access. The staggering process may allocate PRACH resources by a first-in first-out method, or may allocate PRACH resources by an average packet method.
For the high-speed rail scene, MSG1-FDM is configured to be the maximum number of 8, PRACH resources of the same subframe can be increased, and PRACH access time delay is reduced.
The PRACH resource allocation overall allocation is explained below by way of example.
Fig. 4 is a schematic diagram of a handoff procedure implementation, as shown in the drawing, the handoff may include:
step 401, the base station receives the measurement report and prepares for handover.
Step 402, after completing the preparation of switching, the base station sends a switching command, and reserves a large bandwidth short period uplink resource for PRACH transmission.
Step 403, the base station groups the terminals to different PRACH resource groups according to the report sending sequence.
Each PRACH resource group fdm=8, and each resource block contains 40 to 50 non-contention resolution sequences.
Step 404, after receiving the switching request RRC reconfiguration, the terminal initiates random access on different PRACH time-frequency domain resources.
And 405, after all terminals finish switching, the PRACH resource based on MSG1-duration is overtime, and the base station releases the random access PRACH resource.
And after the PRACH resource based on MSG1-duration is overtime, the base station releases the random access PRACH resource and starts to be used for uplink service scheduling.
During handover, since PRACH resources occupy less than 20%, the remaining resources can be used for other user uplink traffic transmission. The PRACH switching resource is dynamically configured again when switching next time.
Based on the same inventive concept, the embodiments of the present invention further provide a base station, a user equipment, and a computer readable storage medium, and because the principles and methods for solving the problems of these devices are similar, the implementation of these devices can refer to the implementation of the PRACH resource allocation method and the random access method, and the repetition is omitted.
In implementing the technical scheme provided by the embodiment of the invention, the method can be implemented as follows.
Fig. 5 is a schematic diagram of a base station, and as shown in the drawing, the base station includes:
the processor 500, configured to read the program in the memory 520, performs the following procedures:
determining the number of terminals to be switched and the switching time;
when the number of the terminals and the switching time exceed a preset threshold, reserving large bandwidth uplink resources and/or short period uplink resources as PRACH resources for the terminals to initiate random access;
releasing the reserved PRACH resources after the switching is finished;
a transceiver 510 for receiving and transmitting data under the control of the processor 500.
In practice, the number of terminals to be switched and the switching time are determined according to the time and the number of MR transmissions from each terminal.
In an implementation, the PRACH resources include:
the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or designates the RACH-ConfigDedic resources through RRC reconfiguration.
In an implementation, further comprising configuring RACH-configdediated resources of the PRACH resources in one or a combination of the following ways:
configuring the use period of PRACH resources to be infinite;
configuring a plurality of PRACH resources for each terminal;
and configuring the use time and the release time of the PRACH resources.
In practice, the usage period of PRACH resource is configured to be infinite, n is SFN X in mod x=y is set to a maximum value.
In the implementation, a plurality of PRACH resources are configured for each terminal, namely a plurality of PRACH-Configuration Index sets are configured for the terminal, and n of each set is defined SFN Y in mod x=y is set to different values, and multiple sets of PRACH resources are configured by RRC configuration ra-accasionlist.
In implementation, the use time and the release time of the PRACH resource are configured by adding MSG1-duration in the RACH-configuration gene in the IERACH-ConfigDedioded, wherein the MSG1-duration is the use time of the MSG1, the starting time point of the MSG1-duration is the time point when the terminal sends the MSG for the first time, and the PRACH corresponding to the MSG1-duration is released after exceeding the use time of the MSG 1.
In implementation, RACH-ConfigCommon resources in the PRACH resources are used for contention random access after terminal disconnection.
In practice, further comprising:
after receiving msg1 sent by the terminal in the same sequence at each burst position of the subframe, diversity gain is performed.
In implementation, the time-frequency domain resource of the PRACH resource is:
the time domain of the uplink time slot is full, or each time slot occupies half of the resources;
And 8 frequency-division are carried out on the frequency domain, and meanwhile, 4 to 8 sets of different PRACH resources are obtained according to msg 1-FrequencyStart.
In practice, further comprising:
grouping the PRACH resources;
each terminal is assigned to a different PRACH resource group.
In practice, fdm=8 for each PRACH resource group, and each resource block contains 40 to 50 non-contention resolution sequences.
Wherein in fig. 5, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 500 and various circuits of memory represented by memory 520, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements, i.e., including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.
The embodiment of the invention provides a base station, which comprises:
the determining module is used for determining the number of terminals to be switched and the switching time;
the reservation module is used for reserving large bandwidth uplink resources and/or short period uplink resources as PRACH resources for the terminal to initiate random access when the number of the terminals and the switching time exceed preset thresholds;
and the release module is used for releasing the reserved PRACH resources after the switching is finished.
In implementation, the determining module is further configured to determine the number of terminals to be switched and the switching time according to the time and the number of MR transmissions of each terminal.
In implementation, the reservation module is further configured to reserve RACH-ConfigCommon resources obtained by the terminal by listening to the cell MIB and/or assign RACH-ConfigDedicated resources by RRC reconfiguration.
In practice, the reservation module is further configured to configure RACH-configdedided resources of the PRACH resources in one or a combination of the following ways:
configuring the use period of PRACH resources to be infinite;
configuring a plurality of PRACH resources for each terminal;
and configuring the use time and the release time of the PRACH resources.
In practice, the usage period of PRACH resource is configured to be infinite, n is SFN X in mod x=y is set to a maximum value.
In an implementation, the reservation module is further configured to configure multiple sets of PRACH resources for each terminal, that is, configure multiple sets of PRACH-Configuration Index for the terminal, and n for each set SFN Y in mod x=y is set to different values, and multiple sets of PRACH resources are configured by RRC configuration ra-accasionlist.
In implementation, the reservation module is further configured to configure a use time and a release time of the PRACH resource by adding MSG1-duration to RACH-Config Generic in IE RACH-configdediated, where the MSG1-duration is the use time of MSG1, and a starting time point of the MSG1-duration is a time point when the terminal first sends the MSG, and releases the PRACH corresponding to the MSG1-duration after exceeding the use time of the MSG 1.
In implementation, the reservation module is further configured to reserve RACH-ConfigCommon resources in the PRACH resources for contention random access after terminal disconnection.
In an implementation, the releasing module is further configured to perform diversity gain after receiving msg1 sent by the terminal in the same sequence at each burst position of the subframe.
In implementation, the reservation module is further configured to reserve time-frequency domain resources of the PRACH resource as:
The time domain of the uplink time slot is full, or each time slot occupies half of the resources;
and 8 frequency-division are carried out on the frequency domain, and meanwhile, 4 to 8 sets of different PRACH resources are obtained according to msg 1-FrequencyStart.
In implementations, the reservation module is further to:
grouping the PRACH resources;
each terminal is assigned to a different PRACH resource group.
In practice, fdm=8 for each PRACH resource group, and each resource block contains 40 to 50 non-contention resolution sequences.
For convenience of description, the parts of the above apparatus are described as being functionally divided into various modules or units, respectively. Of course, the functions of each module or unit may be implemented in the same piece or pieces of software or hardware when implementing the present invention.
Fig. 6 is a schematic diagram of a terminal structure, as shown in the drawing, the terminal includes:
the processor 600, configured to read the program in the memory 620, performs the following procedures:
determining PRACH resources capable of initiating random access, wherein the PRACH resources comprise: the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or the RACH-ConfigDedic resources determined by the terminal through RRC reconfiguration;
initiating random access on the RACH-ConfigDedimated resource, and initiating competitive random access on the RACH-ConfigCommon resource after disconnection;
A transceiver 610 for receiving and transmitting data under the control of the processor 600.
In practice, random access is initiated on the RACH-ConfigDedicated resource in one or a combination of the following ways:
when the service period of the PRACH resource is configured to be infinite, the PRACH resource is accessed in an RRC reconnection mode after the access failure;
when a terminal is configured with a plurality of PRACH resources, after one PRACH resource fails to access, initiating random access in the next PRACH resource;
when the PRACH resource is configured with the use time and the release time, the PRACH resource is accessed by an RRC reconnection mode after the access failure.
In practice, in determining n SFN When x in mod x=y is set to a maximum value, it is determined that the use period of the PRACH resource is configured to be infinite.
In implementation, determining that the terminal is configured with a plurality of PRACH resources according to the ra-OccasionList configured by RRC;
when each set of PRACH resources initiates random access, n is used for each set SFN Y in mod x=y initiates random access.
In implementation, when determining that there is an MSG1-duration with a use time and a release time for configuring a PRACH in RACH-Config Generic in IE RACH-configdedication, determining that a PRACH resource is configured with a use time and a release time, where the MSG1-duration is the use time of MSG1, and a starting time point of the MSG1-duration is a time point when a terminal first sends an MSG, and releasing a PRACH corresponding to the MSG1-duration after exceeding the use time of the MSG 1.
In practice, further comprising:
msg1 sent with the same sequence at each burst position of the subframe.
Wherein in fig. 6, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 600 and various circuits of memory represented by memory 620, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 610 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The user interface 630 may also be an interface capable of interfacing with an inscribed desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.
The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.
The embodiment of the invention provides a terminal, which comprises:
A resource determining module, configured to determine a PRACH resource that can initiate random access, where the PRACH resource includes: the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or the RACH-ConfigDedic resources determined by the terminal through RRC reconfiguration;
and the access module is used for initiating random access on the RACH-ConfigDedimated resource, and initiating competitive random access on the RACH-ConfigCommon resource after the disconnection.
In practice, the access module is further configured to initiate random access on the RACH-ConfigDedicated resource in one of or a combination of the following ways:
when the service period of the PRACH resource is configured to be infinite, the PRACH resource is accessed in an RRC reconnection mode after the access failure;
when a terminal is configured with a plurality of PRACH resources, after one PRACH resource fails to access, initiating random access in the next PRACH resource;
when the PRACH resource is configured with the use time and the release time, the PRACH resource is accessed by an RRC reconnection mode after the access failure.
In practice, the resource determination module is further configured to, in determining n SFN When x in mod x=y is set to a maximum value, it is determined that the use period of the PRACH resource is configured to be infinite.
In implementation, the resource determining module is further configured to determine that the terminal is configured with multiple sets of PRACH resources according to ra-occidionlist configured by RRC;
The access module is further configured to, when each set of PRACH resources initiates random access, determine n for each set SFN Y in mod x=y initiates random access.
In implementation, the resource determining module is further configured to determine that the PRACH resource is configured with a use time and a release time when it is determined that there is an MSG1-duration for configuring the use time and the release time of the PRACH in RACH-configDedioded in the IE RACH-configDedioded, where the MSG1-duration is the use time of the MSG1, and a starting time point of the MSG1-duration is a time point when the terminal first sends the MSG, and release the PRACH corresponding to the MSG1-duration after exceeding the use time of the MSG1.
In an implementation, the access module is further configured to send msg1 with the same sequence at each burst position of the subframe.
For convenience of description, the parts of the above apparatus are described as being functionally divided into various modules or units, respectively. Of course, the functions of each module or unit may be implemented in the same piece or pieces of software or hardware when implementing the present invention.
Embodiments of the present invention provide a computer readable storage medium storing a computer program for executing the PRACH resource allocation method and/or the random access method described above.
Specific implementations may be found in PRACH resource allocation methods and/or random access methods.
In summary, in the technical scheme provided by the embodiment of the invention, different resources are configured by the RACH-ConfigDedimated and the RACH-ConfigCommon, so that the cost of the RACH-ConfigDedimated uplink resources at the moment of high capacity is reduced.
The base station and the terminal can support a plurality of sets of RACH-ConfigDecated resource configurations for switching, and the RRC message ra-OccasionList configuration is adopted.
The new PRACH time domain period is configured to be non-periodic, the SFN x is configured to be a maximum value, a plurality of PRACH resources configured to the terminal are supported, and the purpose that re-access can be performed on other PRACH resources when one PRACH access is unsuccessful is achieved.
Configuring the effective time of RACH-ConfigDedimated, configuring MSG1-duration in RRC reconfiguration message, maintaining the effective time of MSG1 when switching, and releasing the resources used for switching by the base station when the time is over, for the subsequent uplink resource transmission.
The base station reserves a plurality of PRACH resources, groups different PRACH resources for the terminal according to the measurement and report time of the terminal, ensures staggered access of the terminal, improves the success rate of access, and reduces the access waiting time delay. The staggering process may allocate PRACH resources by a first-in first-out method, or may allocate PRACH resources by an average packet method.
MSG1-FDM is configured to be the maximum number of 8, PRACH resources of the same subframe are increased, and PRACH access time delay is reduced.
Therefore, aiming at the characteristic that a plurality of terminals are simultaneously switched as represented by a high-speed rail scene, the resource configuration of PRACH (physical random access channel) during switching and the access resource configuration during static configuration and non-access are dynamically adjusted, the number of PRACH resources during switching is increased, the high-capacity terminals are ensured to be rapidly switched during high-speed rail switching, and the user performance and experience are improved.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (18)
1. A method for configuring PRACH resources of a physical random access channel, comprising:
the base station determines the number of terminals to be switched and the switching time;
when the number of the terminals and the switching time exceed a preset threshold, reserving large bandwidth uplink resources and/or short period uplink resources as PRACH resources for the terminals to initiate random access;
releasing the reserved PRACH resources after the switching is finished;
the PRACH resources include:
the terminal public configuration RACH-ConfigCommon resources of a physical random access channel obtained by monitoring a cell control information block MIB, and/or dedicated configuration RACH-ConfigDedimated resources of the physical random access channel are designated by RRC reconfiguration;
the RACH-ConfigCommon resource in the PRACH resource is used for contention random access after terminal disconnection;
after receiving msg1 sent by a terminal by adopting the sequence of the same sequence at each burst position of a subframe, diversity gain is carried out;
grouping the PRACH resources;
each terminal is assigned to a different PRACH resource group.
2. The method of claim 1, wherein determining the number of terminals to be handed over and the time to handover is based on the time and the number of measurement reports MR sent by each terminal.
3. The method of claim 1, further comprising configuring RACH-ConfigDedicated resources of the PRACH resources in one or a combination of:
configuring the use period of PRACH resources to be infinite;
configuring a plurality of PRACH resources for each terminal;
and configuring the use time and the release time of the PRACH resources.
4. The method of claim 3, wherein configuring the usage period of PRACH resources to be infinite is to n SFN X in modx=y is set to a maximum value.
5. The method of claim 3, wherein,the PRACH resources of multiple sets are configured for each terminal, namely, the PRACH-Configuration Index index is configured for the terminal to configure each set of physical random access channels n SFN Y in modx=y is set to different values, and a plurality of PRACH resources are configured through a radio resource control RRC configuration random access occasion list ra-accasionlist.
6. The method of claim 3 wherein the configuration of the usage time and the release time of the PRACH resources is that the usage time and the release time of the PRACH are configured by adding MSG1-duration to the physical random access channel configuration Generic RACH-configuration Generic in the information element IE RACH-configuration, wherein the MSG1-duration is the usage time of MSG1, the starting time point of the MSG1-duration is the time point when the terminal first sends the MSG, and the PRACH corresponding to the MSG1-duration is released after exceeding the usage time of the MSG 1.
7. The method of claim 1, wherein the time-frequency domain resources of the PRACH resources are:
the time domain of the uplink time slot is full, or each time slot occupies half of the resources;
and frequency-dividing 8 frequency domains, and simultaneously obtaining 4 to 8 sets of different PRACH resources according to the message 1-starting frequency msg 1-FrequencyStart.
8. The method of claim 1, wherein the frequency division multiplexing of each of the PRACH resource groups fdm=8, each resource block comprising 40 to 50 non-contention resolution sequences.
9. A random access method, comprising:
the terminal determines PRACH resources capable of initiating random access, wherein the PRACH resources comprise: the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or the RACH-ConfigDedic resources determined by the terminal through RRC reconfiguration;
the terminal initiates random access on the RACH-ConfigDedimated resource, and initiates competitive random access on the RACH-ConfigCommon resource after the disconnection;
the terminal adopts msg1 sent by the same sequence at each burst position of the subframe;
wherein the PRACH resources are grouped; each terminal is assigned to a different set of PRACH resources.
10. The method of claim 9, wherein a terminal initiates random access on the RACH-configdediated resource in one of or a combination of:
When the service period of the PRACH resource is configured to be infinite, the PRACH resource is accessed in an RRC reconnection mode after the access failure;
when a terminal is configured with a plurality of PRACH resources, after one PRACH resource fails to access, initiating random access in the next PRACH resource;
when the PRACH resource is configured with the use time and the release time, the PRACH resource is accessed by an RRC reconnection mode after the access failure.
11. The method of claim 10, wherein the terminal is determining n SFN When x in mod x=y is set to a maximum value, it is determined that the use period of the PRACH resource is configured to be infinite.
12. The method of claim 10, wherein the terminal determines that the terminal is configured with a plurality of sets of PRACH resources according to an RRC configured ra-accasionlist;
when the terminal initiates random access to each PRACH resource, the terminal is divided into each set n SFN Y in modx=y initiates random access.
13. The method of claim 10, wherein when the terminal determines that there is a message 1 period MSG1-duration in RACH-Config Generic in IE RACH-configdedication in which the use time and release time of the PRACH are configured, it determines that the PRACH resource is configured with the use time and release time, wherein MSG1-duration is the use time of message 1MSG1, and a starting time point of MSG1-duration is a time point when the terminal first transmits the MSG, and releases the PRACH corresponding to MSG1-duration after exceeding the use time of MSG 1.
14. A base station, comprising:
a processor for reading the program in the memory, performing the following process:
determining the number of terminals to be switched and the switching time;
when the number of the terminals and the switching time exceed a preset threshold, reserving large bandwidth uplink resources and/or short period uplink resources as PRACH resources for the terminals to initiate random access;
releasing the reserved PRACH resources after the switching is finished;
a transceiver for receiving and transmitting data under the control of the processor;
the PRACH resources include:
the terminal public configuration RACH-ConfigCommon resources of a physical random access channel obtained by monitoring a cell control information block MIB, and/or dedicated configuration RACH-ConfigDedimated resources of the physical random access channel are designated by RRC reconfiguration;
the RACH-ConfigCommon resource in the PRACH resource is used for contention random access after terminal disconnection;
after receiving msg1 sent by a terminal by adopting the sequence of the same sequence at each burst position of a subframe, diversity gain is carried out;
grouping the PRACH resources;
each terminal is assigned to a different PRACH resource group.
15. A base station, comprising:
The determining module is used for determining the number of terminals to be switched and the switching time;
the reservation module is used for reserving large bandwidth uplink resources and/or short period uplink resources as PRACH resources for the terminal to initiate random access when the number of the terminals and the switching time exceed preset thresholds;
a releasing module, configured to release the reserved PRACH resource after the handover is completed;
the PRACH resources include:
the terminal public configuration RACH-ConfigCommon resources of a physical random access channel obtained by monitoring a cell control information block MIB, and/or dedicated configuration RACH-ConfigDedimated resources of the physical random access channel are designated by RRC reconfiguration;
the RACH-ConfigCommon resource in the PRACH resource is used for contention random access after terminal disconnection;
the release module is further configured to perform diversity gain after receiving msg1 sent by the terminal in the burst position of the subframe by using the sequence of the same sequence;
the reservation module is further configured to: grouping the PRACH resources; each terminal is assigned to a different PRACH resource group.
16. A terminal, comprising:
a processor for reading the program in the memory, performing the following process:
Determining PRACH resources capable of initiating random access, wherein the PRACH resources comprise: the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or the RACH-ConfigDedic resources determined by the terminal through RRC reconfiguration;
initiating random access on the RACH-ConfigDedimated resource, and initiating competitive random access on the RACH-ConfigCommon resource after disconnection;
a transceiver for receiving and transmitting data under the control of the processor;
the terminal adopts msg1 sent by the same sequence at each burst position of the subframe;
wherein the PRACH resources are grouped; each terminal is assigned to a different set of PRACH resources.
17. A terminal, comprising:
a resource determining module, configured to determine a PRACH resource that can initiate random access, where the PRACH resource includes: the terminal monitors the RACH-ConfigCommon resources obtained by the cell MIB and/or the RACH-ConfigDedic resources determined by the terminal through RRC reconfiguration;
an access module, configured to initiate random access on the RACH-ConfigDedicated resource, and initiate contention random access on the RACH-ConfigCommon resource after the connection is dropped;
the access module is further used for the terminal to transmit msg1 with the same sequence at each burst position of the subframe;
Wherein the PRACH resources are grouped; each terminal is assigned to a different set of PRACH resources.
18. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program for executing the method of any one of claims 1 to 13.
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