CN109152083B - Random access method, device and user equipment - Google Patents
Random access method, device and user equipment Download PDFInfo
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- CN109152083B CN109152083B CN201710457768.5A CN201710457768A CN109152083B CN 109152083 B CN109152083 B CN 109152083B CN 201710457768 A CN201710457768 A CN 201710457768A CN 109152083 B CN109152083 B CN 109152083B
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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
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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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, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
Abstract
The invention provides a random access method, a random access device and user equipment. The method comprises the following steps: receiving a system message sent by a base station on a default subband of a serving cell where the system message is located, wherein the system message comprises random access configuration and applicable bandwidth of a plurality of subbands of the serving cell where the system message is located; selecting a lead code from random access resources of a sub-band corresponding to random access configuration with the applicable bandwidth being lower than or equal to the bandwidth capability of the lead code; on the sub-band corresponding to the selected lead code, the lead code is sent to a base station according to the random access configuration of the sub-band; and receiving the random access response fed back by the base station on the sub-band corresponding to the selected preamble. The invention can realize the load balance of random access, and simultaneously avoid the problem that the intelligent terminal can not be smoothly accessed into the network due to the large amount of access of low-cost terminals.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a random access method, apparatus, and user equipment.
Background
When a UE (User Equipment) accesses a network, it needs to initiate random access to acquire uplink synchronization. The UE in a connected state also needs to initiate Random Access in some scenarios, for example, when uplink is out of step, if there is uplink data to be transmitted, the UE needs to send a competitive Random Access Procedure (Contention based Random Access Procedure); when the uplink is out of step, if the base station needs to send data to the UE, the base station can trigger the UE to execute competitive or non-competitive random access through the physical downlink control signaling; after the UE sends the scheduling request reaching the preset threshold number of times, if the base station has not sent an uplink scheduling Grant (UL Grant) to the UE, the UE needs to trigger a competitive random access.
For the competitive random access, firstly, the UE randomly selects a Preamble (Preamble), and then sends the Preamble to the base station; then, the base station sends a random access response to the UE; next, the UE sends MSG3 (i.e. the third message in the random access process) according to the uplink resource included in the random access response, and when the UE initially accesses the network, MSG3 includes an RRC connection request; when the UE performs handover, MSG3 contains a handover request; and finally, the base station sends competition resolving to indicate that the UE is successfully accessed randomly.
In 5G, because 5G is deployed at high frequency, wireless signals exhibit characteristics of good directivity and large path loss at high frequency, a large cell needs multiple beams (Beam) to achieve complete coverage, and one Beam can only cover a limited range. A small cell may contain only one beam. For a cell formed by multiple beams, due to the limitation of hardware, not all beams can be transmitted at the same time, and time-sharing transmission is required, which is called Beam Sweeping (Beam Sweeping).
The bandwidth of a cell in 5G may be very wide, and far exceeds the bandwidth of a cell in LTE (Long Term Evolution). The maximum cell bandwidth in LTE is 20MHz, and the bandwidth of a 5G cell can reach 400 MHz. In fact, many UEs do not need to use such a large bandwidth to conduct services, and some non-intelligent terminals can only receive signals with limited bandwidth due to the limitation of hardware capability, and can only support transmitting signals with limited bandwidth. Generally, in order to enable all types of terminals to access a network, a serving cell where the UE is located has a default subband, and the UE can receive a system message and receive a paging signaling from the subband, and initiate random access and establish RRC connection in the default subband when there is a service requirement, so as to establish a data radio bearer to perform a service. In order to take account of the capabilities of all terminals, the default sub-band is only the minimum value of the reception bandwidths of all possible terminals, for example, if the reception bandwidth capability of the low-cost terminal is only 5MHz, the default sub-band can only be 5MHz, otherwise, the low-cost terminal cannot access the network.
In the process of implementing the invention, the inventor finds that at least the following technical problems exist in the prior art:
when a large-bandwidth cell can only configure a narrow default sub-band for terminal access, a problem of relatively serious load imbalance is caused, and an intelligent terminal cannot smoothly perform services due to simultaneous access of a large number of low-cost terminals to a network.
Disclosure of Invention
The random access method, the random access device and the user equipment provided by the invention can realize load balance of random access, and simultaneously avoid the problem that the intelligent terminal can not be smoothly accessed into a network due to a large amount of access of low-cost terminals.
In a first aspect, the present invention provides a random access method, applied to a user equipment, where the method includes:
receiving a system message sent by a base station on a default subband of a serving cell where the system message is located, wherein the system message comprises random access configuration and applicable bandwidth of a plurality of subbands of the serving cell where the system message is located;
selecting a lead code from random access resources of a sub-band corresponding to random access configuration with the applicable bandwidth being lower than or equal to the bandwidth capability of the lead code;
on the sub-band corresponding to the selected lead code, the lead code is sent to a base station according to the random access configuration of the sub-band;
and receiving the random access response fed back by the base station on the sub-band corresponding to the selected preamble.
Optionally, the random access configuration includes preamble information available for random access and a time-frequency location of random access.
Optionally, the preamble information includes the number of preambles and a sequence generation manner corresponding to each preamble.
Optionally, the sending the preamble to the base station according to the random access configuration of the sub-band includes: sending the lead code to a base station at a time-frequency position of random access corresponding to the sub-band;
the receiving the random access response fed back by the base station comprises: and receiving the random access response fed back by the base station according to the receiving bandwidth of the random access response indicated in the random access configuration corresponding to the sub-band.
Optionally, the system message further includes probabilities that the UE selects preambles in different sub-bands;
the selecting the preamble from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capability of the random access configuration comprises: and selecting the lead code from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capacity of the lead code according to the probability of selecting the lead code in the different sub-bands by the UE in the system message.
Optionally, when the serving cell in which the serving cell is located includes a plurality of beams, the randomly selecting the preamble from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capability of the serving cell includes: and randomly selecting a preamble from random access resources of a sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the self bandwidth capacity from a plurality of available sub-bands corresponding to one or more beams with the maximum beam strength.
Optionally, the one or more beams with the maximum beam intensity are beams exceeding a preset beam intensity threshold among a plurality of beams of a serving cell where the one or more beams with the maximum beam intensity are located, or beams forming cell signal intensity.
In a second aspect, the present invention provides a random access apparatus, located in a user equipment, the apparatus including:
a first receiving unit, configured to receive, on a default subband of a serving cell where the first receiving unit is located, a system message sent by a base station, where the system message includes random access configurations and applicable bandwidths of multiple subbands of the serving cell where the first receiving unit is located;
the selection unit is used for selecting a lead code from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth being lower than or equal to the bandwidth capability of the selection unit;
a sending unit, configured to send the preamble to a base station according to the random access configuration of the sub-band on the sub-band corresponding to the preamble selected by the selecting unit;
and a second receiving unit, configured to receive, on the sub-band corresponding to the preamble selected by the selecting unit, a random access response fed back by the base station. Optionally, the random access configuration includes preamble information available for random access and a time-frequency location of random access.
Optionally, the preamble information includes the number of preambles and a sequence generation manner corresponding to each preamble.
Optionally, the sending unit is configured to send the preamble to a base station at a time-frequency position of random access corresponding to the sub-band;
and the second receiving unit is configured to receive the random access response fed back by the base station according to the receiving bandwidth of the random access response indicated in the random access configuration corresponding to the sub-band.
Optionally, the system message further includes probabilities that the UE selects preambles in different sub-bands;
and the selecting unit is used for selecting the lead code from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capability of the selecting unit according to the probability of selecting the lead code in the different sub-bands by the UE in the system message.
Optionally, when the serving cell in which the serving cell is located includes a plurality of beams, the selecting unit is configured to randomly select the preamble from the random access resource of the sub-band corresponding to the random access configuration having the applicable bandwidth lower than or equal to the bandwidth capability of the serving cell in which the serving cell is located, among a plurality of available sub-bands corresponding to one or more beams having the largest beam strength.
Optionally, the one or more beams with the maximum beam intensity are beams exceeding a preset beam intensity threshold among a plurality of beams of a serving cell where the one or more beams with the maximum beam intensity are located, or beams forming cell signal intensity.
In a third aspect, the present invention provides a user equipment, where the user equipment includes the random access apparatus.
The random access method, the random access device and the user equipment provided by the embodiment of the invention receive the random access configuration of a plurality of sub-bands of the service cell where the base station is located and the system information of the applicable bandwidth thereof sent by the base station on the default sub-band of the service cell where the base station is located, select the lead code from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capability of the base station, send the lead code to the base station according to the random access configuration of the sub-band on the sub-band corresponding to the selected lead code, and receive the random access response fed back by the base station. Compared with the prior art, the method and the device can ensure that the sending of the lead code is distributed discretely among different beams and different sub-bands as much as possible before the UE initiates the random access, realize the discretization of the random access among the different beams and the different sub-bands and further realize the load balance of the random access; meanwhile, the problem that the intelligent terminal cannot smoothly access the network due to the fact that a large number of low-cost terminals are accessed is avoided.
Drawings
Fig. 1 is a flowchart of a random access method according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a structure of a subband in a cell according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a random access apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
An embodiment of the present invention provides a random access method, which is applied to a UE, and as shown in fig. 1, the method includes:
s11, the UE receives a system message sent by the base station on the default sub-band of the service cell where the UE is located, wherein the system message comprises the random access configuration of a plurality of sub-bands of the service cell where the UE is located and the applicable bandwidth of the sub-bands.
The random access configuration comprises preamble code information available for random access and a time-frequency position of the random access; the preamble information includes the number of preambles and a sequence generation method corresponding to each preamble.
S12, the UE selects a preamble from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capability of the UE.
Optionally, the system message may further include probabilities that the UE selects preambles in different subbands; the UE may select the preamble from the random access resource of the sub-band corresponding to the random access configuration having the applicable bandwidth lower than or equal to its bandwidth capability according to the probability that the UE selects the preamble in the different sub-bands in the system message.
Optionally, when the serving cell in which the UE is located includes multiple beams, the UE may randomly select a preamble from random access resources of a subband corresponding to a random access configuration with an applicable bandwidth lower than or equal to its bandwidth capability, among multiple available subbands corresponding to one or multiple beams with the largest beam strength; the one or more beams with the maximum beam intensity are beams which exceed a preset beam intensity threshold or beams which form cell signal intensity in a plurality of beams of a serving cell where the beam intensity is the maximum. Here, the beam strength refers to a power value of a reference signal on a beam of the cell detected by the UE, and the reference signal may be a secondary synchronization signal.
S13, the UE sends the lead code to the base station according to the random access configuration of the sub-band on the sub-band corresponding to the selected lead code.
Specifically, the UE sends the preamble to the base station at a time-frequency position of random access corresponding to the sub-band.
And S14, the UE receives the random access response fed back by the base station on the sub-band corresponding to the selected preamble.
Specifically, the random access configuration of the sub-band indicates receiving bandwidth information of a random access response, and the user equipment receives the random access response fed back by the base station according to the indicated receiving bandwidth.
In the random access method provided by the embodiment of the invention, the UE receives the system information which is sent by the base station and comprises the random access configuration of a plurality of sub-bands of the service cell and the applicable bandwidth thereof on the default sub-band of the service cell, selects the lead code from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capability of the UE, sends the lead code to the base station on the sub-band corresponding to the selected lead code according to the random access configuration of the sub-band and receives the random access response fed back by the base station. Compared with the prior art, the method and the device can ensure that the sending of the lead code is distributed discretely among different beams and different sub-bands as much as possible before the UE initiates the random access, realize the discretization of the random access among the different beams and the different sub-bands and further realize the load balance of the random access; meanwhile, the problem that the intelligent terminal cannot smoothly access the network due to the fact that a large number of low-cost terminals are accessed is avoided.
The following describes the random access method provided in the embodiment of the present invention in detail by using a specific embodiment.
As shown in fig. 2, for a cell containing only one beam, one cell is composed of 4 subbands, where a default subband is subband 0(Bandwidth Part 0), an idle UE resides on the subband, and a base station transmits a System Information (SI) and a paging message on the subband. Where the SI typically indicates the random access resources applicable to the default sub-band, such as preambles available for random access in the default sub-band (here, 50 preambles are assumed), time-frequency location of random access, etc., and the bandwidth of the default sub-band, such as 5MHz, is also indicated in the system message.
If there is a UE initiating Random Access in the default sub-band, the UE receives a Random Access Response (RAR) according to a bandwidth of 5MHz, and the base station also allocates resources for transmitting the RAR according to the bandwidth of 5MHz and allocates resources for transmitting MSG3 to the UE according to the bandwidth of 5MHz (that is, the transmission resources of MSG3 are limited to within the bandwidth of 5 MHz).
In order to avoid overload of random access in the default sub-band caused by the UE initiating random access in the default sub-band, the system message needs to indicate the random access configuration in the other sub-bands, for example, indicate that the configuration of random access in sub-band 2(bandwidth part 2) includes available preambles (including the number of 100, and corresponding sequence generation manner), time-frequency position of random access, and the like; the configuration indicating the random access in the sub-band 3(bandwidth part 3) includes available preambles (including the number of 60, for example, and the corresponding sequence generation manner), the time-frequency position of the random access, and so on.
In order to enable the base station to distinguish the receiving bandwidth capability/transmitting bandwidth capability of the terminal as early as possible, the system message further indicates its applicable UE capability, for example, the applicable 20MHz bandwidth capability when indicating the random access configuration in sub-band 2, and further indicates its applicable UE capability of 5MHz when indicating the random access configuration in sub-band 3. Here, the random access configuration in sub-band 2 applies 20MHz, which does not mean that the bandwidth of sub-band 2 is only 20MHz, and sub-band 2 may exceed 20MHz, but the base station is limited to only 20MHz when transmitting RAR and is limited to only 20MHz when allocating uplink resources for transmitting MSG 3.
For an idle UE, if the bandwidth capability of the UE is limited to 5MHz, the UE finds that 5MHz is applicable to the default sub-band and the random access resource configured in the sub-band 3 through a system message, so the UE may randomly select a preamble from the random access resource of the default sub-band and the sub-band 3, and at this time, there are 50+60 ═ 110 preambles in total, so the UE randomly selects among the 110 preambles, for example, the UE selects a certain preamble located in the sub-band 3, the UE transmits the selected preamble at a corresponding time-frequency position according to the configuration of random access in the sub-band 3, after receiving the preamble transmitted by the UE, the base station transmits a random access response (which may be located in the sub-band 3) according to the bandwidth capability of 5MHz, and the UE may know by default the configuration of the random access resource in the sub-band 3 the receiving position of the RAR or additionally indicate the configuration of the random access resource in the sub-band 3 in the system message (which may include RAR transmitting the The starting location of the bandwidth that may be occupied, a total of 5MHz bandwidth), and allocating transmission resources for transmitting MSG3 to the UE in accordance with the bandwidth capability of 5 MHz.
For a high bandwidth UE, for example, the UE's capability allows 100MHz to be received/transmitted, so when the UE camps on the current cell and tries to access the network, the UE may select random access resources in subband 0, subband 2, and subband 3 for random access, where a total of 50+100+60 ═ 210 preambles are available for the UE to select, and the UE randomly selects from the 210 preambles. For example, the UE selects a certain preamble in subband 2, sends the selected preamble at a time-frequency position of random access in subband 2, receives the RAR at the corresponding position according to a reception bandwidth of at least 20MHz, and transmits MSG3 according to transmission resources allocated by the base station in the RAR. If the random access of the UE is successful, the base station can obtain the complete capability information of the UE from the UE, and then the base station allocates reasonable working bandwidth for the UE according to the service requirement and the capability of the UE.
By the method, the UE with different bandwidths can select the applicable random access resource. Meanwhile, the problem that the intelligent terminal cannot access the network due to overload of random access of the default sub-band caused by a large number of low-cost terminals is solved, the intelligent terminal may initially select the lead code in the default sub-band and cannot access the network smoothly, and once the intelligent terminal selects the lead code in the non-default sub-band, the intelligent terminal can access the network smoothly to develop services.
Optionally, the base station may additionally indicate, in the system message, probabilities of selecting preambles of different subbands by the UE, where the probabilities of selecting preambles in the subbands 0, 2, and 3 are 20%, 60%, and 20%, respectively. When the preamble is selected for the high-bandwidth UE, the preamble in sub-band 2 is selected with a probability of 60%, and the preambles in sub-bands 0 and 3 are selected with probabilities of 20% and 20%. For example, the UE may first generate a random number between 0 and 1, and if the random number is lower than 0.2, select the preamble in subband 0; if the random number is between 0.2 and 0.8 (0.2< ═ random number <0.8), the preamble in subband 2 is selected, and if the random number is 0.8 or more, the preamble in subband 3 is selected.
For a cell containing multiple beams, the base station may allocate random access resources per beam, or multiple beams may correspond to a set of random access resources. If the UE can detect multiple beams of the cell and the random access resources corresponding to the multiple beams are different, the UE needs to select from the random access resources corresponding to the multiple beams found by the UE if the UE needs to initiate random access.
For example, the UE detects Reference Signal Received Powers (RSRPs) of three beams in a cell, which are Beam 1RSRP > Beam 2RSRP > Beam 3RSRP, in turn, each Beam corresponds to a synchronization signal Block (SS Block), and random access resources configured for each Beam are different, for example, the number of preambles corresponding to Beam 1 is 210 (corresponding to the total number of preambles in the above three subbands), the number of preambles corresponding to Beam 2 is also 210, and the number of preambles corresponding to Beam 3 is 150. The base station may configure the same number of preambles for different beams, or may configure different numbers of preambles.
When selecting the random access preamble, the UE selects the preamble in the random access resource corresponding to the strongest detected beam or beams, where the selected beams need to satisfy that the RSRP of the beam exceeds the threshold, or selects one or more beams constituting a cell signal. The UE needs to perform cell reselection in an idle state, for example, the UE ranks the co-frequency cells according to the detected cell signal strength, and selects a cell with the strongest signal to camp on. The signal strength of a cell is integrated, e.g., averaged, with the strongest beam or beams of the cell being detected by the UE. Here, if the signal strength of the serving cell is generated by beam 1 and beam 2, the UE selects an optional preamble corresponding to beam 1 and beam 2 when initiating random access. If the bandwidth reception capability of the UE exceeds 20MHz, the UE may randomly select from a total of 420 preambles in the two beams. And determining a sub-band and a wave beam corresponding to the selected lead code according to the selected result, and executing random access at the time-frequency position sent by the random access lead code corresponding to the sub-band and the wave beam.
An embodiment of the present invention further provides a random access apparatus, located in a user equipment, as shown in fig. 3, where the apparatus includes:
a first receiving unit 11, configured to receive a system message sent by a base station on a default subband of a serving cell where the first receiving unit is located, where the system message includes random access configurations and applicable bandwidths of multiple subbands of the serving cell where the first receiving unit is located;
a selecting unit 12, configured to select a preamble from a random access resource of a sub-band corresponding to a random access configuration with an applicable bandwidth lower than or equal to its bandwidth capability;
a sending unit 13, configured to send the preamble to a base station according to the random access configuration of the sub-band on the sub-band corresponding to the preamble selected by the selecting unit 12;
a second receiving unit 14, configured to receive a random access response fed back by the base station on the sub-band corresponding to the preamble selected by the selecting unit 12.
The random access configuration comprises preamble code information available for random access and a time-frequency position of the random access; the preamble information includes the number of preambles and a sequence generation method corresponding to each preamble.
The sending unit 13 is configured to send the preamble to the base station at a time-frequency position of random access corresponding to the sub-band;
the second receiving unit 14 is configured to receive the random access response fed back by the base station according to the receiving bandwidth of the random access response indicated in the random access configuration corresponding to the sub-band.
Optionally, the system message further includes probabilities that the UE selects preambles in different sub-bands;
the selecting unit 12 is configured to select the preamble from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth being lower than or equal to the bandwidth capability of the random access configuration according to the probability that the UE selects the preamble in the different sub-bands in the system message.
Optionally, when the serving cell in which the serving cell is located includes a plurality of beams, the selecting unit 12 is configured to randomly select a preamble from random access resources of a sub-band corresponding to a random access configuration having an applicable bandwidth lower than or equal to the bandwidth capability of the serving cell, among a plurality of available sub-bands corresponding to one or more beams having the largest beam strength.
The one or more beams with the maximum beam intensity are beams which exceed a preset beam intensity threshold or beams which form cell signal intensity in a plurality of beams of a serving cell where the beam intensity is the maximum.
The random access device provided in the embodiment of the present invention receives, on a default sub-band of a serving cell where the random access device is located, a system message that is sent by a base station and includes a plurality of sub-bands of the serving cell where the random access device is located and an applicable bandwidth thereof, selects a preamble from a random access resource of a sub-band corresponding to a random access configuration whose applicable bandwidth is lower than or equal to a bandwidth capability of the random access configuration, sends the preamble to the base station according to the random access configuration of the sub-band on the sub-band corresponding to the selected preamble, and receives a random access response fed back by the base station. Compared with the prior art, the method and the device can ensure that the sending of the lead code is distributed discretely among different beams and different sub-bands as much as possible before the UE initiates the random access, realize the discretization of the random access among the different beams and the different sub-bands and further realize the load balance of the random access; meanwhile, the problem that the intelligent terminal cannot smoothly access the network due to the fact that a large number of low-cost terminals are accessed is avoided.
The apparatus of this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
The embodiment of the invention also provides the user equipment, and the user equipment comprises the random access device.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A random access method applied to User Equipment (UE), the method comprising:
receiving a system message sent by a base station on a default subband of a serving cell of the base station, wherein the system message comprises random access configuration and applicable bandwidth of a plurality of subbands of the serving cell of the base station, the random access configuration comprises lead code information available for random access and time-frequency position of random access, and the lead code information comprises lead code number and a sequence generation mode corresponding to each lead code;
selecting a lead code from random access resources of a sub-band corresponding to random access configuration with the applicable bandwidth being lower than or equal to the bandwidth capability of the lead code;
on the sub-band corresponding to the selected lead code, the lead code is sent to a base station on the time-frequency position of random access corresponding to the sub-band;
and receiving the random access response fed back by the base station on the sub-band corresponding to the selected lead code according to the receiving bandwidth of the random access response indicated in the random access configuration corresponding to the sub-band.
2. The method of claim 1, wherein the system message further includes probabilities of the UE selecting preambles in different sub-bands;
the selecting the preamble from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capability of the random access configuration comprises: and selecting the lead code from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capacity of the lead code according to the probability of selecting the lead code in the different sub-bands by the UE in the system message.
3. The method of claim 1, wherein when the serving cell in which the serving cell is located includes a plurality of beams, the randomly selecting the preamble from the random access resources of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capability of the serving cell comprises: and randomly selecting a preamble from random access resources of a sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the self bandwidth capacity from a plurality of available sub-bands corresponding to one or more beams with the maximum beam strength.
4. The method according to claim 3, wherein the one or more beams with the largest beam strength are beams that exceed a preset beam strength threshold or beams that constitute cell signal strength among the plurality of beams of the serving cell in which the one or more beams have the largest beam strength.
5. A random access apparatus at a user equipment, the apparatus comprising:
a first receiving unit, configured to receive, on a default subband of a serving cell in which the first receiving unit is located, a system message sent by a base station, where the system message includes random access configurations and applicable bandwidths of multiple subbands of the serving cell in which the first receiving unit is located, where the random access configurations include preamble information available for random access and time-frequency positions of random access, and the preamble information includes a number of preambles and a sequence generation manner corresponding to each preamble;
the selection unit is used for selecting a lead code from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth being lower than or equal to the bandwidth capability of the selection unit;
a sending unit, configured to send, to a base station, the preamble at a time-frequency position of random access corresponding to a subband corresponding to the preamble selected by the selecting unit;
and a second receiving unit, configured to receive, on the sub-band corresponding to the preamble selected by the selecting unit, the random access response fed back by the base station according to the receiving bandwidth of the random access response indicated in the random access configuration corresponding to the sub-band.
6. The apparatus of claim 5, wherein the system message further includes probabilities of the UE selecting preambles in different sub-bands;
and the selecting unit is used for selecting the lead code from the random access resource of the sub-band corresponding to the random access configuration with the applicable bandwidth lower than or equal to the bandwidth capability of the selecting unit according to the probability of selecting the lead code in the different sub-bands by the UE in the system message.
7. The apparatus of claim 5, wherein when the serving cell includes a plurality of beams, the selecting unit is configured to randomly select the preamble from the random access resources of the sub-band corresponding to the random access configuration having the applicable bandwidth lower than or equal to the bandwidth capability of the serving cell, among a plurality of available sub-bands corresponding to one or more beams with the largest beam strength.
8. The apparatus of claim 7, wherein the one or more beams with the largest beam strength are beams that exceed a preset beam strength threshold or beams that form cell signal strength among a plurality of beams of a serving cell in which the one or more beams have the largest beam strength.
9. A user equipment, characterized in that the user equipment comprises a random access apparatus according to any of claims 5 to 8.
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| EP4088541A4 (en) * | 2020-01-09 | 2023-12-20 | Telefonaktiebolaget LM Ericsson (publ) | Random access for low-complexity user equipment |
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