CN105657854B - Uplink access method, device and base station in LTE system - Google Patents
Uplink access method, device and base station in LTE system Download PDFInfo
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- CN105657854B CN105657854B CN201510993270.1A CN201510993270A CN105657854B CN 105657854 B CN105657854 B CN 105657854B CN 201510993270 A CN201510993270 A CN 201510993270A CN 105657854 B CN105657854 B CN 105657854B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/006—Synchronisation arrangements determining timing error of reception due to propagation delay using known positions of transmitter and receiver
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Abstract
The embodiment of the invention discloses an uplink access method in an LTE system, which comprises the following steps: the method comprises the steps that a base station respectively receives PRACH from UE in different coverage areas by using multi-level sampling windows, wherein the number of levels included in the multi-level sampling windows is increased along with the step-shaped increase of the maximum coverage radius of the base station. And after the PRACH is detected by the base station, determining the TA of the UE sending the PRACH. And the base station sends the TA to the UE so that the UE can adjust the uplink transmission time according to the TA. The invention realizes the hierarchical sampling of the UE in different distance ranges by utilizing the multistage sampling window, and realizes the uplink access of the UE which is more than 100km away from the base station in the LTE system, thereby enabling the base station to support farther coverage distance so as to reduce the network deployment cost.
Description
Technical Field
The invention relates to the technical field of LTE communication, in particular to an uplink access method, device and base station in an LTE system.
Background
LTE (Long Term Evolution) is a Long Term Evolution of The UMTS (Universal mobile telecommunications System) technical standard established by The 3GPP (The 3rd Generation Partnership Project) organization.
According to the 3GPP protocol, the physical random access channel PRACH designed by the standard LTE can support the farthest coverage distance of 100 km. In some extra-large-range or extra-long-distance scenes, such as original forest monitoring, sea surface shipping or drilling platform coverage, etc., the base station is required to support a longer coverage distance so as to reduce the networking cost.
Disclosure of Invention
In view of this, the present invention provides an uplink access method, apparatus and system in an LTE system, which achieve a coverage distance of a base station greater than 100 km.
The embodiment of the invention provides an uplink access method in an LTE system, which comprises the following steps:
a base station respectively receives Physical Random Access Channels (PRACH) from terminal equipment (UE) in different coverage areas by using multistage sampling windows, wherein the number of stages included in the multistage sampling windows is increased along with the stepwise increase of the maximum coverage radius of the base station;
after the base station detects the PRACH, determining a time advance TA of UE (user equipment) which sends the PRACH;
and the base station sends the TA to the UE so that the UE can adjust the uplink transmission time according to the TA.
Preferably, the base station receives PRACH from UEs with different coverage areas by using multiple sampling windows, respectively, including:
presetting a multi-level sampling window by the base station, wherein the multi-level sampling window at least comprises a first-level sampling window and a second-level sampling window, and the second-level sampling window is delayed by a preset time period than the initial time of the first-level sampling window;
and the base station respectively receives the PRACH from the UE in different coverage areas by utilizing the first-stage sampling window and the second-stage sampling window.
Preferably, the method further comprises:
and when the base station allocates resources for the UE, the resources with the preset length behind the guard interval GT of the PRACH are emptied.
Preferably, the preset length is proportional to a maximum coverage radius of the base station.
Preferably, the sending, by the base station, the TA to the UE includes:
when the distance between the UE and the base station is not more than 160km, the base station sends the TA carried by 11 bits to the UE;
and when the distance between the UE and the base station is more than 160km, the base station sends the TA carried by 12 bits to the UE, wherein the 12 bits comprise 1bit reserved by a protocol.
The invention also provides an uplink access device in the LTE system, and the device comprises:
a receiving module, configured to use multiple sampling windows to respectively receive PRACH (physical random access channels) from terminal UEs in different coverage areas, where, along with a stepwise increase in a maximum coverage radius of the base station, the number of levels included in the multiple sampling windows also increases;
a determining module, configured to determine a timing advance TA of a UE that sends the PRACH after the PRACH is detected;
and the sending module is used for sending the TA to the UE so that the UE can adjust the uplink transmission time according to the TA.
Preferably, the receiving module includes:
the method comprises the steps that a submodule is set and used for presetting a multi-level sampling window, wherein the multi-level sampling window at least comprises a first-level sampling window and a second-level sampling window, and the second-level sampling window is delayed by a preset time period than the starting time of the first-level sampling window;
and the receiving submodule is used for respectively receiving the PRACH from the UE in different coverage areas by utilizing the first-stage sampling window and the second-stage sampling window.
Preferably, the apparatus further comprises:
and the allocation module is used for emptying the resources with the preset length after the guard interval GT of the PRACH when the resources are allocated to the UE.
Preferably, the preset length is proportional to a maximum coverage radius of the base station.
Preferably, the sending module includes:
a first sending submodule, configured to send the TA carried by 11 bits to the UE when a distance between the UE and the base station is not greater than 160 km;
and the second sending submodule is used for sending the TA carried by 12 bits to the UE when the distance between the UE and the base station is more than 160km, wherein the 12 bits comprise 1bit reserved by a protocol.
The invention also provides an uplink access base station in the LTE system, which comprises a memory and a processor,
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the following steps according to instructions in the program code: respectively receiving Physical Random Access Channels (PRACH) from terminal equipment (UE) in different coverage areas by using multistage sampling windows, wherein the number of stages included in the multistage sampling windows is increased along with the stepwise increase of the maximum coverage radius of the base station; after PRACH detection is carried out on the PRACH, the time advance TA of the UE which sends the PRACH is determined; and sending the TA to the UE so that the UE can adjust the uplink transmission time according to the TA.
In the uplink access method in the LTE system provided by the invention, a base station respectively receives PRACH from terminal UE in different coverage areas by utilizing multi-level sampling windows, and the number of levels included in the multi-level sampling windows is in direct proportion to the maximum coverage radius of the base station. And after the base station detects the PRACH, determining the TA of the UE sending the PRACH. And finally, the base station sends the TA to the UE so that the UE can adjust the uplink transmission time according to the TA. The invention realizes the hierarchical sampling of the UE in different distance ranges by utilizing the multistage sampling window, and more accurately realizes the uplink access of the UE which is more than 100km away from a base station in an LTE system.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a flowchart of an uplink access method in an LTE system according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating that a base station acquires PRACH sequences from UEs at different distances from the base station using multiple sampling windows according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a frame format using 12 bits to carry a TA according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an uplink access apparatus in an LTE system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an uplink access base station in an LTE system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Currently, according to the 3GPP protocol, the farthest coverage distance that a base station designed by the standard LTE can support is 100 km. In order to meet the requirement of an implementation scenario of an ultra-long coverage distance greater than 100km, the uplink access method provided by the embodiment of the invention realizes hierarchical sampling of UEs in different distance ranges by using a multi-level sampling window, and realizes uplink access of UEs which are greater than 100km away from a base station in an LTE system. In addition, in the embodiment of the invention, the base station does not allocate the resources with the preset length behind the GT of the PRACH to any UE during resource allocation, so that the expansion of the PRACH is realized, and the expanded PRACH can support the uplink access of the UE with the distance of more than 100 km.
In the following embodiments, the terminal may be an intercom, but is not limited thereto.
The following describes embodiments of the present invention.
Referring to fig. 1, a flowchart of an uplink access method in an LTE system according to an embodiment of the present invention is shown, where the method includes:
s101: the method comprises the steps that a base station respectively receives PRACH from terminal UE in different coverage areas by using multi-level sampling windows, wherein the number of levels included in the multi-level sampling windows is increased along with the step-shaped increase of the maximum coverage radius of the base station.
S102: and after the base station detects the PRACH, determining the TA of the UE sending the PRACH.
S103: and the base station sends the TA to the UE so that the UE can adjust the uplink transmission time according to the TA.
In an ultra-long-distance coverage scene of the LTE system, the time for a terminal farther from a base station to send a Preamble is later. The guard interval GT of PRACH is to avoid collision of the Preamble arriving later at the base station with the next uplink subframe. In the embodiment of the invention, in order to realize the ultra-long distance coverage of the base station, the terminal which is more than 100km, even more than 160km away from the base station can be successfully accessed to the base station, therefore, when the base station in the embodiment of the invention allocates resources for the terminal, the resources with the preset length after the protection interval GT of the PRACH are emptied, thereby prolonging the length of the GT and forming the expanded PRACH. Wherein the preset length to be nulled is proportional to the maximum coverage radius of the base station.
In S101, since the distance from the terminal to the base station in the ultra-long coverage scenario of the LTE system may exceed 100km, even 160km, the base station cannot accurately acquire the PRACH sent by the ultra-long terminal only by using the current sampling window for acquiring the terminal within 100 km. The embodiment of the invention uses multi-level sampling windows to respectively collect PRACHs (physical random access channels) sent by UEs (user equipments) in different coverage areas. Specifically, the number of sampling windows of the base station as a whole is proportional to the maximum coverage radius of the base station. Specifically, as the maximum coverage radius of the base station increases in a stepwise manner, the number of stages included in the multi-stage sampling window also increases. When the maximum coverage radius of the base station is increased in one step, the number of stages included in the multi-level sampling window is unchanged, and only when the maximum coverage radius of the base station is increased to the next step, the number of stages included in the multi-level sampling window is increased by one step. For example, the maximum coverage radius of the base station increasing in one step means that the maximum coverage radius of the base station varies between 1-100km, or between 100km-200 km. The maximum coverage radius of the base station is increased to the next step, which means that the maximum coverage radius of the base station is changed from 1-100km to 100-200 km.
In practical application, the base station can collect sampling windows of different levels of each terminal according to the distance between the terminal and the base station. For example, a first-level sampling window is used for collecting terminals with a distance of 0-100km from the base station, a second-level sampling window is used for collecting terminals with a distance of 100km-200km from the base station, and so on, so as to realize the collection of the terminals with different coverage ranges by the sampling windows of different levels. And the second-stage sampling window is delayed by a preset time period than the starting time of the first-stage sampling window, and so on, and the starting time of the next-stage sampling window is delayed compared with the starting time of the previous-stage sampling window. For example, the second stage sampling window for acquisition 100km to 200km from the base station is delayed by 0.67ms from the start time for acquisition of the first stage sampling window 0 to 100km from the base station.
As shown in fig. 2, a schematic diagram of a base station acquiring PRACH sequences from UEs at different distances from the base station by using multiple sampling windows is provided in the embodiment of the present invention. The first-stage sampling window is used for collecting PRACH sequences from terminals of 0-100km, and the second-stage sampling window is used for collecting PRACH sequences from terminals of 100-200 km. Since the CP part is the data circularly shifted behind the PRACH, the first level sampling window can collect the complete data of the PRACH sequence from the terminal of 0-100km, the second level sampling window can collect the complete data of the PRACH sequence from the terminal of 100km-200km, and so on.
In S102, the base station determines the timing advance TA of different terminals by performing PRACH detection on the acquired PRACH from different terminals. And the time advance TA corresponding to the terminal with the longer distance from the base station is longer. Specifically, the method for the base station to perform PRACH detection is more, and is not described herein again.
In S103, after the base station determines the timing advance TA corresponding to each terminal, the TA is sent to the corresponding terminal, so that each terminal can adjust its uplink transmission time according to the received TA. And if the TA of the terminal which is far away from the base station is longer, the terminal needs to transmit uplink data in advance for a longer time.
In the uplink access method in the LTE system provided by the embodiment of the present invention, a base station receives PRACH from UEs in different coverage areas by using multiple sampling windows, respectively, where the number of levels included in the multiple sampling windows is proportional to the maximum coverage radius of the base station. And after the base station detects the PRACH, determining the TA of the UE sending the PRACH. And finally, the base station sends the TA to the UE so that the UE can adjust the uplink transmission time according to the TA. The embodiment of the invention realizes the hierarchical sampling of the UE in different distance ranges by utilizing the multistage sampling window, and more accurately realizes the uplink access of the UE which is more than 100km away from the base station in the LTE system, thereby enabling the base station to support longer coverage distance so as to reduce the network deployment cost.
In addition, since the TA specified in the current LTE standard protocol can only be carried by 11 bits, even if the range of [0, 2^11-1] is fully used, the base station can be supported to cover the distance of 160km at most. In fact, only the range of [0, 1282] is currently used, i.e. the TA value is 1282 × 16Ts ═ 0.67ms, corresponding to the maximum coverage distance of the base station of 100 km.
In order to enable the TA value to support the base station to realize coverage at a longer distance, the embodiment of the present invention uses a bit reserved in the current protocol in the frame structure to carry the TA, that is, the embodiment of the present invention can use 12 bits to carry the TA, so that the TA value at this time can support the base station to realize coverage at a longer distance, and in fact, the base station can be supported to realize a coverage distance of 320km at a maximum. As shown in fig. 3, a frame format schematic diagram for carrying a TA by using 12 bits provided in the embodiment of the present invention is shown, where R is a bit reserved in a current protocol, and a TA is carried by using one bit of R and an original Timing Advance Command of 11 bits together in the embodiment of the present invention, so that a TA value that can be carried is larger, and further, a base station is supported to realize a coverage distance of 320km farthest.
In practical applications, before transmitting the TA to each UE, the base station first determines whether the distance between the UE and the base station has been checked by 160 km. When the distance between the UE and the base station is not more than 160km, the base station sends the TA carried by 11 bits to the UE; and when the distance between the UE and the base station is more than 160km, the base station sends the TA carried by 12 bits to the UE, wherein the 12 bits comprise 1bit reserved by a protocol. The embodiment of the invention realizes the ultra-long distance coverage of the base station by expanding the frame structure for bearing the TA.
An embodiment of the present invention further provides an uplink access apparatus in an LTE system, and referring to fig. 4, the apparatus is a schematic structural diagram of the uplink access apparatus in the LTE system provided in the embodiment of the present invention, and the apparatus includes:
a receiving module 401, configured to receive PRACH from terminal UEs in different coverage areas respectively by using multiple sampling windows, where, along with a stepwise increase of a maximum coverage radius of the base station, the number of stages included in the multiple sampling windows also increases;
a determining module 402, configured to determine a timing advance TA of a UE that sends the PRACH after the PRACH is detected;
a sending module 403, configured to send the TA to the UE, so that the UE adjusts uplink transmission time according to the TA.
In order to realize the ultra-long distance coverage of the base station, the embodiment of the invention enables the terminal which is more than 100km or even more than 160km away from the base station to be successfully accessed to the base station, therefore, the embodiment of the invention realizes the hierarchical sampling of the UE in different distance ranges by utilizing the multilevel sampling window, and more accurately realizes the uplink access of the UE which is more than 100km away from the base station in the LTE system.
In practical applications, the receiving module 401 may include:
the method comprises the steps that a submodule is set and used for presetting a multi-level sampling window, wherein the multi-level sampling window at least comprises a first-level sampling window and a second-level sampling window, and the second-level sampling window is delayed by a preset time period than the starting time of the first-level sampling window;
and the receiving submodule is used for respectively receiving the PRACH from the UE in different coverage areas by utilizing the first-stage sampling window and the second-stage sampling window.
In addition, in the ultra-long coverage scenario of the LTE system, the time for the terminal farther away from the base station to send the Preamble is later. The guard interval GT of PRACH is to avoid collision of the Preamble arriving later at the base station with the next uplink subframe. In order to implement the super-long distance coverage of the base station, so that a terminal which is over 100km or even over 160km away from the base station can successfully access the base station, the apparatus of the embodiment of the present invention may further include:
and the allocation module is used for emptying the resources with the preset length after the guard interval GT of the PRACH when the resources are allocated to the UE.
Wherein the preset length is proportional to the maximum coverage radius of the base station.
In order to support the base station to realize a longer coverage distance, the embodiment of the present invention extends the frame structure for carrying the TA, and specifically, the TA may be carried by using 12 bits, where the 12 bits include 1bit reserved by the protocol.
Specifically, the sending module may include:
a first sending submodule, configured to send the TA carried by 11 bits to the UE when a distance between the UE and the base station is not greater than 160 km;
and the second sending submodule is used for sending the TA carried by 12 bits to the UE when the distance between the UE and the base station is more than 160km, wherein the 12 bits comprise 1bit reserved by a protocol.
The uplink access device in the LTE system provided by the embodiment of the invention can realize the following functions: and respectively receiving the extended PRACH from the UE in different coverage areas by utilizing a multi-level sampling window, wherein the number of levels included in the multi-level sampling window is in direct proportion to the maximum coverage radius of the base station. And after PRACH detection is carried out on the extended PRACH, determining the TA of the UE sending the extended PRACH. And sending the TA to the UE so that the UE can adjust the uplink transmission time according to the TA. The embodiment of the invention realizes the hierarchical sampling of the UE in different distance ranges by utilizing the multistage sampling window, and more accurately realizes the uplink access of the UE which is more than 100km away from a base station in an LTE system. In addition, the embodiment of the invention can support the base station to realize farther coverage distance by expanding the frame structure for bearing the TA and utilizing 12 bits to bear the TA.
The present invention further provides a schematic structural diagram of an uplink access base station in an LTE system, as shown in fig. 5, where the base station at least includes a memory 501, at least one processor 502, and at least one network interface 503; the memory 501, the processor 502 and the network interface 503 are connected to each other via a bus.
The memory 501 is used to store program codes and transfer the program codes to the processor 502.
The processor 502 is configured to perform the following steps according to instructions in the program code: respectively receiving PRACH from terminal UE in different coverage areas by using multi-level sampling windows, wherein the number of levels included in the multi-level sampling windows is increased along with the stepwise increase of the maximum coverage radius of the base station; after PRACH detection is carried out on the PRACH, the time advance TA of the UE which sends the PRACH is determined; and sending the TA to the UE so that the UE can adjust the uplink transmission time according to the TA.
Further, the processor 502 presets a multi-level sampling window, where the multi-level sampling window at least includes a first-level sampling window and a second-level sampling window, and the second-level sampling window is delayed by a preset time period from the start time of the first-level sampling window;
and the base station respectively receives the PRACH from the UE in different coverage areas by utilizing the first-stage sampling window and the second-stage sampling window.
Further, when allocating resources to the UE, the processor 502 nulls resources with a preset length after the guard interval GT of the PRACH; the preset length is proportional to the maximum coverage radius of the base station.
Further, when the distance between the UE and the base station is not greater than 160km, the processor 502 sends the TA carried by 11 bits to the UE;
when the distance between the UE and the base station is greater than 160km, the processor 502 sends the TA carried by 12 bits to the UE, where the 12 bits include 1bit reserved by a protocol.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described system embodiments are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The uplink access method, apparatus and base station in the LTE system provided by the embodiment of the present invention are described in detail above, and a specific example is applied in the description to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. An uplink access method in an LTE system, the method comprising:
a base station respectively receives complete data of a Physical Random Access Channel (PRACH) sequence from terminal UE (user equipment) in different coverage areas by using a multi-level sampling window, wherein the complete data of the PRACH sequence comprises a CP (content protection channel) part, and the CP part is data circularly shifted behind the PRACH; the number of levels included in the multi-level sampling window is increased along with the step-wise increase of the maximum coverage radius of the base station;
the base station determines the TA of the terminal from different coverage areas by detecting the PRACH of the terminal from different coverage areas;
the base station sends the TA to the UE so that the UE can adjust uplink transmission time according to the TA;
the base station sends the TA to the UE, and the method comprises the following steps:
when the distance between the UE and the base station is not more than 160km, the base station sends the TA carried by 11 bits to the UE;
and when the distance between the UE and the base station is more than 160km, the base station sends the TA carried by 12 bits to the UE, wherein the 12 bits comprise 1bit reserved by a protocol.
2. The method of claim 1, wherein the base station receives the PRACH from UEs with different coverage areas respectively using multiple sampling windows, and comprises:
presetting a multi-level sampling window by the base station, wherein the multi-level sampling window at least comprises a first-level sampling window and a second-level sampling window, and the second-level sampling window is delayed by a preset time period than the initial time of the first-level sampling window;
and the base station respectively receives the PRACH from the UE in different coverage areas by using the first level sampling window and the second level sampling window.
3. The method of claim 1, further comprising:
and when the base station allocates resources for the UE, the resources with the preset length behind the guard interval GT of the PRACH are emptied.
4. The method of claim 3, wherein the preset length is proportional to a maximum coverage radius of the base station.
5. An uplink access apparatus in an LTE system, the apparatus comprising:
a receiving module, configured to use multiple sampling windows to respectively receive complete data of a PRACH sequence of a physical random access channel from a terminal UE in different coverage areas, where the complete data of the PRACH sequence includes a CP portion, and the CP portion is data cyclically shifted after the PRACH; the multistage sampling window comprises a plurality of stages which are increased along with the stepwise increase of the maximum coverage radius of the base station;
a determining module, configured to perform PRACH detection on the received PRACH from terminals with different coverage areas, and determine timing advance TA of the terminals with different coverage areas;
a sending module, configured to send the TA to the UE, so that the UE adjusts uplink transmission time according to the TA;
the sending module comprises:
a first sending submodule, configured to send the TA carried by 11 bits to the UE when a distance between the UE and the base station is not greater than 160 km;
and the second sending submodule is used for sending the TA carried by 12 bits to the UE when the distance between the UE and the base station is more than 160km, wherein the 12 bits comprise 1bit reserved by a protocol.
6. The apparatus of claim 5, wherein the receiving module comprises:
the method comprises the steps that a submodule is set and used for presetting a multi-level sampling window, wherein the multi-level sampling window at least comprises a first-level sampling window and a second-level sampling window, and the second-level sampling window is delayed by a preset time period than the starting time of the first-level sampling window;
and the receiving submodule is used for respectively receiving the PRACH from the UE in different coverage areas by using the first-stage sampling window and the second-stage sampling window.
7. The apparatus of claim 5, further comprising:
and the allocation module is used for emptying the resources with the preset length after the guard interval GT of the PRACH when the resources are allocated to the UE.
8. The apparatus of claim 7, wherein the preset length is proportional to a maximum coverage radius of the base station.
9. An uplink access base station in an LTE system, the base station comprising a memory and a processor,
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the following steps according to instructions in the program code: using a multi-level sampling window to respectively receive complete data of a Physical Random Access Channel (PRACH) sequence from terminal UE (user equipment) with different coverage areas, wherein the complete data of the PRACH sequence comprises a CP (content protection channel) part, and the CP part is data circularly shifted behind the PRACH; the number of levels included in the multi-level sampling window is increased along with the step-wise increase of the maximum coverage radius of the base station; the base station determines the TA of the terminal from different coverage areas by detecting the PRACH of the terminal from different coverage areas; when the distance between the UE and the base station is not more than 160km, the base station sends the TA carried by 11 bits to the UE; and when the distance between the UE and the base station is more than 160km, the base station sends the TA carried by 12 bits to the UE, wherein the 12 bits comprise 1bit reserved by a protocol, so that the UE adjusts uplink transmission time according to the TA.
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| WO2017107197A1 (en) * | 2015-12-25 | 2017-06-29 | 海能达通信股份有限公司 | Upstream access method, apparatus and base station in lte system |
| CN110109509B (en) * | 2019-03-27 | 2021-03-02 | 北京比特大陆科技有限公司 | Delay correction method, circuit, device, equipment and computer readable storage medium |
| WO2021128291A1 (en) * | 2019-12-27 | 2021-07-01 | Oppo广东移动通信有限公司 | Random access method and terminal device |
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| CN102938931A (en) * | 2011-08-15 | 2013-02-20 | 北京为邦远航无线技术有限公司 | Wide-range nonsynchronous uplink accessing method and device |
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| CN102724149B (en) * | 2012-05-16 | 2015-09-09 | 华为技术有限公司 | Frequency offset precompensation method, accidental access method, equipment and system |
| KR102217075B1 (en) * | 2014-04-21 | 2021-02-18 | 삼성전자 주식회사 | Apparatus and method for random access in wireless communication system |
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