CN111836373B - Access method and system for unauthorized carrier cell - Google Patents
Access method and system for unauthorized carrier cell Download PDFInfo
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- CN111836373B CN111836373B CN201910327063.0A CN201910327063A CN111836373B CN 111836373 B CN111836373 B CN 111836373B CN 201910327063 A CN201910327063 A CN 201910327063A CN 111836373 B CN111836373 B CN 111836373B
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- 230000004913 activation Effects 0.000 claims abstract description 66
- 230000004044 response Effects 0.000 claims abstract description 7
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- 230000003993 interaction Effects 0.000 claims description 5
- 230000002452 interceptive effect Effects 0.000 claims description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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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
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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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
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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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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Abstract
The application discloses an access method and a system of an unauthorized carrier cell, wherein the method comprises the following steps: for a cell working on an unlicensed carrier, a base station broadcasts the positions of an initial activation downlink bandwidth Block (BWP) and an initial activation uplink BWP of the cell and the position of a Physical Random Access Channel (PRACH) resource in the initial activation uplink BWP through a system message, wherein the initial activation downlink BWP and the initial activation uplink BWP are positioned in different sub-bands, and only one PRACH is configured in the frequency domain of the initial activation uplink BWP; and the User Equipment (UE) in an idle state learns the positions of the initial activation downlink BWP and the initial activation uplink BWP and the position of the PRACH resource according to the monitored system message, executes listen-before-talk (LBT) operation when needing to access the network, initiates random access by using the PRACH in the initial activation uplink BWP, and monitors and receives a random access response message returned by the base station in the initial activation downlink BWP. By adopting the invention, the access time delay of the UE can be reduced.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to an access method and system for an unlicensed carrier cell.
Background
Each 5G cell is configured with an initial activation uplink BandWidth Block (BWP) and an initial activation downlink BWP. A base station sends a system broadcast message in an initial activation downlink BWP band, various public search spaces are configured on the initial activation downlink BWP, and UE monitors the search spaces to acquire downlink control information sent by a network; random Access Channel (PRACH) resources are configured within the initially active uplink BWP band, and the UE uses these resources to trigger random access. The idle state UE obtains the initial position and the bandwidth of the initial activation uplink and downlink BWP by reading the system broadcast message.
For a 5G cell working on an asymmetric spectrum of a TDD band, the center frequency points of the initial activated uplink BWP and the initial activated downlink BWP are the same, but the bandwidths may be different, that is, the two BWPs overlap in the frequency domain. The base station may configure a maximum of 4 downlink BWPs and 4 uplink BWPs for the connected UE, where each downlink BWP is bound to one uplink BWP to form a BWP pair, and at any time, only one BWP pair is active, and the UE only receives/transmits data in the currently active downlink/uplink BWP pair. In the TDD mode, the network also configures a Default downlink BWP (Default DL BWP) and a Default uplink BWP for the connected UE, and generally, the bandwidth of the Default downlink BWP is smaller, which can reduce the power consumption of the connected UE. When the UE has no data transmission or reception, the currently activated downlink BWP is dropped to the default downlink BWP to reduce power consumption of the terminal, and when data needs to be transmitted, the UE switches to another downlink BWP.
In the current 5G technical research, a 5G network may be deployed on an unlicensed spectrum, and a 5G cell (New Radio-unlicensed cell, NR-U cell) operating in the unlicensed spectrum may be an independent cell, that is, similar to a cell operating in the licensed spectrum, and may independently send a system broadcast message, and may independently accept access of a UE, and transmit uplink and downlink data for the UE. Since the channel is shared, in order to ensure fair coexistence with the WiFi system, the 5G base station and the terminal operating in the unlicensed spectrum must perform LBT (Listen Before Talk) operation Before transmitting data, where the LBT "Listen Before Talk" means that when a wireless device (including the base station and the UE) operating in the unlicensed spectrum prepares to transmit data, it first needs to monitor the wireless channel condition, and only when detecting that the wireless channel is idle, it can occupy the channel to transmit data, and if the channel is busy, it cannot use the wireless channel, and needs to wait for the next transmission opportunity. The wireless device monitors the wireless channel condition in units of sub-bands of 20MHz bandwidth, and according to the monitoring result, data can be transmitted on the idle (unoccupied) sub-bands, and data cannot be transmitted on the busy (occupied) sub-bands. The bandwidth of the initial active uplink BWP and the initial active downlink BWP of the 5G cell operating in the unlicensed spectrum are both about 20MHz, that is, equivalent to one LBT listening sub-band.
The inventor discovers that in the process of implementing the invention: the resource allocation scheme of the existing unlicensed carrier cell has the problem of large access delay of the UE. Based on the above scheme, when the initial activation uplink BWP and the initial activation downlink BWP of the NR-U cell overlap, the base station needs to send periodic system broadcast information, downlink reference signal, downlink PDCCH, and the like on the initial activation downlink BWP, because of the limitation of LBT operation, only one device is sending on the same subband at any time, during this time, the UE cannot trigger random access on the PRACH resource of the initial activation uplink BWP, and only during the time interval of base station transmission, the UE can trigger random access, which limits the access timing of the UE, resulting in an increase of UE access delay, as shown in fig. 1.
Disclosure of Invention
The application provides an access method and system of an unauthorized carrier cell, which can effectively reduce the access time delay of UE.
The embodiment of the invention provides an access method of an unauthorized carrier cell, which comprises the following steps:
for a cell working on an unlicensed carrier, a base station broadcasts, through a system message, the positions of an initial activated downlink bandwidth Block (BWP) and an initial activated uplink BWP of the cell, and the position of a Physical Random Access Channel (PRACH) resource in the initial activated uplink BWP, wherein the initial activated downlink BWP and the initial activated uplink BWP are located in different sub-bands, and only one PRACH is configured in the frequency domain of the initial activated uplink BWP;
and the User Equipment (UE) in an idle state learns the positions of the initial activation downlink BWP and the initial activation uplink BWP and the position of the PRACH resource according to the monitored system message, executes listen-before-talk (LBT) operation when the network needs to be accessed, initiates random access by using the PRACH in the initial activation uplink BWP, and monitors and receives a random access response message returned by the base station at the initial activation downlink BWP.
Preferably, the method further comprises:
and the base station configures a default downlink BWP and a default uplink BWP for the UE in a connected state in the cell, wherein the default downlink BWP and the default uplink BWP are positioned in different sub-bands.
Preferably, the method further comprises:
if the default uplink BWP of the UE in the connected state is configured with PRACH resource, when the currently activated downlink BWP of the UE in the connected state is the default downlink BWP, the UE in the connected state is notified to receive data, and if the uplink is out of synchronization, performs LBT operation, and initiates random access by using the PRACH in the default uplink BWP, wherein only one PRACH is configured in the frequency domain of the default uplink BWP.
Preferably, the method further comprises:
the position of the initial activation uplink BWP of the local cell and the position of PRACH resource in the initial activation uplink BWP are interacted between the adjacent base stations through an Xn interface;
and the base station judges whether the following conditions exist according to the interactive result: the PRACH resource positions of a local unauthorized carrier cell and an adjacent unauthorized carrier cell are the same, if the PRACH resource positions of the local unauthorized carrier cell and the adjacent unauthorized carrier cell are the same, whether the base station is the current PRACH resource conflict solution entity is determined according to a preset conflict solution entity selection strategy, if the PRACH resource conflict solution entity exists, the PRACH resource of the corresponding local cell is triggered to be reconfigured according to the principle that the PRACH frequency domain positions in the initial activation uplink BWP of the adjacent cell are different, and the adjusted PRACH frequency domain position is notified to the adjacent base station by utilizing an Xn interface.
The embodiment of the invention also provides an access system of the unauthorized carrier cell, which comprises the following steps:
a base station, configured to broadcast, through a system message, the positions of an initial activated downlink bandwidth block BWP and an initial activated uplink BWP of a cell operating on an unlicensed carrier, and the position of a PRACH resource of a physical random access channel in the initial activated uplink BWP, where the initial activated downlink BWP and the initial activated uplink BWP are located in different subbands, and only one PRACH is configured in the frequency domain of the initial activated uplink BWP;
user Equipment (UE) is configured to learn, when the UE is in an idle state, locations of the initially activated downlink BWP and the initially activated uplink BWP and a location of the PRACH resource according to the monitored system message, perform listen-before-talk (LBT) operation when a network needs to be accessed, initiate random access by using the PRACH in the initially activated uplink BWP, and monitor and receive a random access response message returned by the base station at the initially activated downlink BWP.
Preferably, the base station is further configured to configure a default downlink BWP and a default uplink BWP for the UE in the connected state in the cell, where the default downlink BWP and the default uplink BWP are located in different sub-bands.
Preferably, the UE is further configured to, if there is a PRACH resource in the default uplink BWP configured in the connected state, if the activated downlink BWP in the connected state is the default downlink BWP, after being notified of data reception, if the uplink is out of synchronization, perform LBT operation, and initiate random access using the PRACH in the default uplink BWP, where only one PRACH is configured in the frequency domain of the default uplink BWP.
Preferably, the base station is further configured to interact, via an Xn interface, with an adjacent base station, a location of an initially activated uplink BWP of the local cell and a location of a PRACH resource within the initially activated uplink BWP; and judging whether the following conditions exist according to the interaction result: the PRACH resource positions of a local unauthorized carrier cell and an adjacent unauthorized carrier cell are the same, if the PRACH resource positions of the local unauthorized carrier cell and the adjacent unauthorized carrier cell are the same, whether the base station is the current PRACH resource conflict solution entity is determined according to a preset conflict solution entity selection strategy, if the PRACH resource conflict solution entity exists, the PRACH resource of the corresponding local cell is triggered to be reconfigured according to the principle that the PRACH frequency domain positions in the initial activation uplink BWP of the adjacent cell are different, and the adjusted PRACH frequency domain position is notified to the adjacent base station by utilizing an Xn interface.
As can be seen from the foregoing technical solutions, in the access method and system for an unlicensed carrier cell provided in the present application, a network side needs to configure an initially activated downlink BWP and an initially activated uplink BWP on different subbands, and only one PRACH is configured in a frequency domain of the initially activated uplink BWP. Therefore, the base station can send the downlink broadcast information, the reference signal and the downlink control information and the UE triggers the random access operation at the same time, thereby increasing the idle UE random access opportunity and effectively shortening the network access delay of the terminal.
Drawings
Fig. 1 is a schematic view illustrating access delay analysis of a conventional unlicensed carrier cell UE;
FIG. 2 is a schematic flow chart of a method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.
An embodiment of the present invention provides an embodiment of an access method for an unlicensed carrier cell, and as shown in fig. 2, the method includes:
Here, the division of the sub-band can be implemented by using the method of the existing system, that is, when the bandwidth of the NR-U cell is greater than 20MHz, the NR-U cell is divided into several sub-bands with the bandwidth of 20 MHz.
One of the technical features of this step different from the existing solutions is that the initial activation downlink BWP and the initial activation uplink BWP are located in different sub-bands, so that the operations of sending downlink broadcast information, reference signals and downlink control information by the base station and triggering random access by the UE are no longer mutually exclusive but are not mutually affected by each other by configuring the initial activation uplink BWP and the initial activation downlink BWP of the unlicensed carrier cell (i.e. NR-U cell), and can be performed simultaneously, thereby increasing the opportunity of random access by the UE in an idle state, effectively shortening the network access delay of the terminal, and improving the user experience.
In addition, another technical feature different from the existing scheme is that: when the PRACH resources are configured in the initial activation uplink BWP, a Frequency Division Multiplexing (FDM) mode is not used in the frequency domain, that is, at any time, there is only one PRACH at most in the initial activation uplink BWP band. As such, PRACH resources may be wasted due to the inability of multiple UEs to simultaneously initiate random access in the case where a terminal of an unlicensed carrier cell must perform an LBT operation before transmitting data.
As described in the background art, in order to reduce power consumption of the terminal, when the connected UE of the unlicensed carrier cell has no data transmission or reception, the currently activated downlink BWP may fall back to the default downlink BWP, and when there is data to be transmitted, the UE may switch to another downlink BWP. For the above scenario, in order to further shorten the network access delay when the terminal needs to transmit data and the uplink is out of synchronization, the default downlink BWP and the default uplink BWP may be configured on different sub-bands, that is:
and the base station configures a default downlink BWP and a default uplink BWP for the UE in a connected state in the cell, wherein the default downlink BWP and the default uplink BWP are positioned in different sub-bands.
Preferably, if the PRACH resource is configured in the default uplink BWP, when the connected UE needs to transmit data again after falling back to the default downlink BWP and the uplink is out of synchronization, the PRACH resource in the default uplink BWP may be used to initiate random access, specifically:
if the default uplink BWP of the UE in the connected state is configured with PRACH resources, when the currently activated downlink BWP of the UE in the connected state is the default downlink BWP, the UE in the connected state is notified to receive data, and if the uplink is out of synchronization, performs LBT operation, and initiates random access by using the PRACH in the default uplink BWP, where only one PRACH is configured in the frequency domain of the default uplink BWP.
In the method, the default downlink BWP and the default uplink BWP are configured on different subbands, so that after the connected UE falls back to the default downlink BWP, the operation of sending downlink information by the base station and triggering random access by the UE can be performed simultaneously, thereby increasing the time for random access by the UE and effectively shortening the network access delay of the terminal.
Further, the inventors found, when carrying out the present invention: in the existing scheme, at the same time, adjacent cell UEs may send preambles (preambles) on PRACH in the same frequency domain position, so that co-channel interference between cells may be increased, thereby affecting the decoding success rate of the PRACH channel. To solve the problem, in this embodiment of the present application, adjacent base stations may interact with subband information where an initial activation uplink BWP of a local cell is located through an Xn interface, and when a collision occurs, trigger adjustment of a frequency domain position of a PRACH in the initial activation uplink BWP of a corresponding cell, so that the PRACH in the initial activation uplink BWP of the adjacent cell occupies different frequency domain resources, so as to reduce inter-cell co-channel interference. The above object is achieved by the following method:
the position of the initial activation uplink BWP of the local cell and the position of PRACH resource in the initial activation uplink BWP are interacted between the adjacent base stations through an Xn interface;
the base station judges whether the following conditions exist according to the interaction result: the PRACH resource positions of a local unauthorized carrier cell and an adjacent unauthorized carrier cell are the same, if the PRACH resource positions of the local unauthorized carrier cell and the adjacent unauthorized carrier cell are the same, whether the base station is the current PRACH resource conflict solution entity is determined according to a preset conflict solution entity selection strategy, if the PRACH resource conflict solution entity exists, the PRACH resource of the corresponding local cell is triggered to be reconfigured according to the principle that the PRACH frequency domain positions in the initial activation uplink BWP of the adjacent cell are different, and the adjusted PRACH frequency domain position is notified to the adjacent base station by utilizing an Xn interface.
In practical applications, a person skilled in the art may set the conflict resolution entity selection policy according to actual needs, for example, a base station corresponding to a minimum or maximum cell ID may be selected as the conflict resolution entity, but is not limited thereto, and details are not described here.
Corresponding to the above method embodiment, the present application provides an embodiment of an access system of an unlicensed carrier cell, and as shown in fig. 3, the system includes:
a base station, configured to broadcast, through a system message, positions of an initial activated downlink bandwidth block BWP and an initial activated uplink BWP of a cell operating on an unlicensed carrier, and a position of a PRACH resource of a physical random access channel within the initial activated uplink BWP, where the initial activated downlink BWP and the initial activated uplink BWP are located in different subbands, and only one PRACH is configured in a frequency domain of the initial activated uplink BWP;
user Equipment (UE) is configured to learn, when the UE is in an idle state, locations of the initially activated downlink BWP and the initially activated uplink BWP and a location of the PRACH resource according to the monitored system message, perform listen-before-talk (LBT) operation when a network needs to be accessed, initiate random access by using the PRACH in the initially activated uplink BWP, and monitor and receive a random access response message returned by the base station at the initially activated downlink BWP.
Preferably, the base station is further configured to configure a default downlink BWP and a default uplink BWP for the UE in the connected state in the cell, where the default downlink BWP and the default uplink BWP are located in different sub-bands.
Preferably, the UE is further configured to, if there is a PRACH resource in the default uplink BWP configured in the connected state, if the activated downlink BWP in the connected state is the default downlink BWP, after being notified of data reception, if the uplink is out of synchronization, perform LBT operation, and initiate random access using the PRACH in the default uplink BWP, where only one PRACH is configured in the frequency domain of the default uplink BWP.
Preferably, the base station is further configured to interact, via an Xn interface, with an adjacent base station, a location of an initially activated uplink BWP of the local cell and a location of a PRACH resource within the initially activated uplink BWP; and judging whether the following conditions exist according to the interaction result: the PRACH resource positions of a local unauthorized carrier cell and an adjacent unauthorized carrier cell are the same, if the PRACH resource positions of the local unauthorized carrier cell and the adjacent unauthorized carrier cell are the same, whether the base station is the current PRACH resource conflict solution entity is determined according to a preset conflict solution entity selection strategy, if the PRACH resource conflict solution entity exists, the PRACH resource of the corresponding local cell is triggered to be reconfigured according to the principle that the PRACH frequency domain positions in the initial activation uplink BWP of the adjacent cell are different, and the adjusted PRACH frequency domain position is notified to the adjacent base station by utilizing an Xn interface.
As can be seen from the above examples: according to the technical scheme, the initial activation uplink BWP and the initial activation downlink BWP of the unauthorized carrier cell are configured on different sub-bands, so that the operations of sending the downlink broadcast information, the reference signal and the downlink control information by the base station and triggering the random access by the UE are not mutually exclusive any more, the operations can be simultaneously carried out, the opportunity of the random access of the idle UE is increased, and the network access delay of the terminal is effectively shortened. In addition, the PRACH of the same-frequency adjacent cell is configured on different sub-bands or different frequency domain positions of the same sub-band, so that the UE of the adjacent cell cannot transmit the PRACH at the same time and the same frequency domain position, the uplink co-channel interference among the cells is effectively reduced, and the PRACH decoding success rate of the base station is improved.
Two specific implementation examples are given below, and further detailed description is given of specific implementations of the present application:
example 1 as follows, in accordance with example 1,
cell 1 of the 5G base station operates on an unlicensed carrier, the bandwidth is 40MHz, 2 sub-bands, sub-band 0 and sub-band 1 are occupied, UE1 is under the coverage of cell 1 and is in an idle state, and UE2 has established RRC connection with cell 1.
1) A base station configures initial activation downlink BWP of a cell 1 on a sub-band 0, configures initial activation uplink BWP on the sub-band 1, and configures PRACH resources in a frequency domain of the initial activation uplink BWP;
2) A base station configures the default downlink BWP of UE2 in sub-band 0, configures the corresponding uplink BWP in sub-band 1, and configures PRACH resources in the uplink BWP;
3) The UE1 obtains the positions of the initial activation downlink BWP and the initial activation uplink BWP and the position of PRACH resource by reading the system broadcast message of the cell 1;
4) At time t1, cell 1 transmits downlink reference signal at initial activation downlink BWP, UE1 wants to access network to transmit data, it performs LBT to monitor sub-band 1, finds that the channel is idle, UE1 selects available PRACH in initial activation uplink BWP, initiates random access, and then establishes RRC connection with cell 1 after completing access.
5) At time t2, because the UE2 has no data for a period of time, the currently activated downlink BWP is the default downlink BWP, at this time, the uplink of the UE2 is out of synchronization, the network has the data of the UE2 arriving, and sends a PDCCH order instruction on the default downlink BWP, after receiving the instruction, the UE2 immediately executes LBT to monitor the corresponding subband where the uplink BWP is located, finds that the channel is idle, initiates random access on the PRACH configured in the BWP, completes uplink synchronization and receives downlink data.
Example 2 is as follows:
three cells working in unlicensed carriers 5G are deployed in one area, the three cells are adjacent to each other, the bandwidth of each cell is 60MHz, and each cell occupies 3 sub-bands, namely sub-band 0, sub-band 1 and sub-band 2.
1) The initial activation downlink BWPs of the three cells are all configured on sub-band 0, the initial activation uplink BWPs are all configured on sub-band 2, the position of the PRACH configured in the frequency domain of the initial activation uplink BWP of the cell 1 is within the initial 5M bandwidth of the sub-band 2 from low to high, the position of the PRACH of the cell 2 is within the second 5M bandwidth of the sub-band 2 from low to high, and the PRACH position of the cell 3 is the same as that of the cell 1;
2) The three cells interact with the sub-band number where the uplink BWP is initially activated through a base station Xn interface, and the configuration position of the PRACH in the sub-band;
3) After information interaction, the cell 3 finds that the PRACH frequency domain position configured in the sub-band 2 is the same as that of the cell 1, and in order to avoid uplink co-channel interference caused by the fact that two cells transmit the PRACH at the same frequency domain position, the cell 3 determines to change the PRACH position to be within the third 5M bandwidth from the sub-band 2 from low to high;
5) After the configuration modification, cell 3 sends the updated configuration to cells 1 and 2 over the Xn interface.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (8)
1. An access method for an unlicensed carrier cell, comprising:
for a cell working on an unlicensed carrier, a base station broadcasts the positions of an initial activation downlink bandwidth Block (BWP) and an initial activation uplink BWP of the cell and the position of a Physical Random Access Channel (PRACH) resource in the initial activation uplink BWP through a system message, wherein the initial activation downlink BWP and the initial activation uplink BWP are positioned in different sub-bands, and only one PRACH is configured in the frequency domain of the initial activation uplink BWP;
and the User Equipment (UE) in an idle state learns the positions of the initial activation downlink BWP and the initial activation uplink BWP and the position of the PRACH resource according to the monitored system message, executes listen-before-talk (LBT) operation when a network needs to be connected, initiates random access by using the PRACH in the initial activation uplink BWP, and monitors and receives a random access response message returned by the base station at the initial activation downlink BWP.
2. The method of claim 1, wherein: the method further comprises:
and the base station configures a default downlink BWP and a default uplink BWP for the UE in a connected state in the cell, wherein the default downlink BWP and the default uplink BWP are positioned in different sub-bands.
3. The method of claim 2, wherein: the method further comprises:
if the default uplink BWP of the UE in the connected state is configured with PRACH resources, when the currently activated downlink BWP of the UE in the connected state is the default downlink BWP, the UE in the connected state is notified to receive data, and if the uplink is out of synchronization, performs LBT operation, and initiates random access by using the PRACH in the default uplink BWP, where only one PRACH is configured in the frequency domain of the default uplink BWP.
4. The method of claim 1, wherein: the method further comprises:
the method comprises the following steps that the positions of the initial activation uplink BWP of a local cell and the position of PRACH resources in the initial activation uplink BWP are interacted between adjacent base stations through an Xn interface;
and the base station judges whether the following conditions exist according to the interactive result: the PRACH resource positions of a local unauthorized carrier cell and an adjacent unauthorized carrier cell are the same, if the PRACH resource positions of the local unauthorized carrier cell and the adjacent unauthorized carrier cell are the same, whether the base station is the current PRACH resource conflict solution entity is determined according to a preset conflict solution entity selection strategy, if the PRACH resource conflict solution entity exists, the PRACH resource of the corresponding local cell is triggered to be reconfigured according to the principle that the PRACH frequency domain positions in the initial activation uplink BWP of the adjacent cell are different, and the adjusted PRACH frequency domain position is notified to the adjacent base station by utilizing an Xn interface.
5. An access system for an unlicensed carrier cell, comprising:
a base station, configured to broadcast, through a system message, the positions of an initial activated downlink bandwidth block BWP and an initial activated uplink BWP of a cell operating on an unlicensed carrier, and the position of a PRACH resource of a physical random access channel in the initial activated uplink BWP, where the initial activated downlink BWP and the initial activated uplink BWP are located in different subbands, and only one PRACH is configured in the frequency domain of the initial activated uplink BWP;
user Equipment (UE) is configured to learn, when the UE is in an idle state, locations of the initially activated downlink BWP and the initially activated uplink BWP and a location of the PRACH resource according to the monitored system message, perform listen-before-talk (LBT) operation when a network needs to be connected, initiate random access by using the PRACH in the initially activated uplink BWP, and monitor and receive a random access response message returned by the base station at the initially activated downlink BWP.
6. The system of claim 5, wherein:
the base station is further configured to configure a default downlink BWP and a default uplink BWP for the UE in the connected state in the cell, where the default downlink BWP and the default uplink BWP are located in different sub-bands.
7. The system of claim 6, wherein: the UE is further configured to, if there is a PRACH resource in the default uplink BWP configured in the connected state, perform LBT operation and initiate random access using the PRACH in the default uplink BWP if uplink desynchronization is performed after the activated downlink BWP in the connected state is notified of data reception when the activated downlink BWP is the default downlink BWP, where only one PRACH is configured in the frequency domain of the default uplink BWP.
8. The system of claim 5, wherein: the base station is further configured to interact with an adjacent base station through an Xn interface between the base station and the adjacent base station, where the location of the uplink BWP of the local cell is initially activated and the location of the PRACH resource within the uplink BWP is initially activated; and judging whether the following conditions exist according to the interaction result: the PRACH resource positions of a local unauthorized carrier cell and an adjacent unauthorized carrier cell are the same, if the PRACH resource positions of the local unauthorized carrier cell and the adjacent unauthorized carrier cell are the same, whether the base station is the current PRACH resource conflict solution entity is determined according to a preset conflict solution entity selection strategy, if the PRACH resource conflict solution entity exists, the PRACH resource of the corresponding local cell is triggered to be reconfigured according to the principle that the PRACH frequency domain positions in the initial activation uplink BWP of the adjacent cell are different, and the adjusted PRACH frequency domain position is notified to the adjacent base station by utilizing an Xn interface.
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